Battery cell assembly and method for assembling the battery cell assembly

Technical Field

0001The present invention relates to a battery cell asembly and a method for assembling a battery cell assembly.

Background Art

0002Battery cells have been developed to supply electrical power to devices. A problem associated with the battery cells, however, is that the battery cells can generate heat which can degrade the battery cells over time.

0003<patcit id="pcit0001" dnum="EP1577966A"><text>EP 1577966</text></patcit> and <patcit id="pcit0002" dnum="WO2007007503A"><text>WO 2007/007503</text></patcit> describe battery cell assembly comprising cooling passage structure allowing cooling air to pass through.

Disclosure of Invention

Technical Problem

0004Accordingly, the inventors herein have recognized a need for a battery cell assembly that reduces and/or minimizes the foregoing deficiency.

Technical Solution

0005A battery cell assembly in accordance with an exemplary embodiment is provided. The battery cell assembly includes a first battery cell having a first side and a second side opposite the first side. The battery cell assembly further includes a first panel member configured to contact at least a portion of the first side of the first battery cell. The battery cell assembly further includes a heat exchanger having a plastic frame and first and second thermally conductive layers. The plastic frame has an interior space extending therethrough. The plastic frame has a third side and a fourth side opposite the third side. The first thermally conductive layer is disposed on the third side of the plastic frame and covers the interior space. The second thermally conductive layer is disposed on the fourth side of the plastic frame and covers the interior space. The first thermally conductive layer is disposed adjacent the second side of the first battery cell, such that when a liquid is disposed in the interior space, heat energy is transferred from the first battery cell through the first thermally conductive layer to the liquid.

0006A method for assembling a battery cell assembly in accordance with another exemplary embodiment is provided. The battery cell assembly has a first battery cell with a first side and a second side opposite the first side, a first panel member, and a heat exchanger having a plastic frame and first and second thermally conductive layers. The plastic frame has an interior space extending therethrough. The plastic frame has a third side and a fourth side opposite the third side. The method includes disposing the first panel member on at least a portion of the first side of the first battery cell. The method further includes disposing the first thermally conductive layer on the third side of the plastic frame and covering the interior space. The method further includes disposing the second thermally conductive layer on the fourth side of the plastic frame and covering the interior space. The method further includes disposing the first battery cell on the first thermally conductive layer of the heat exchanger to obtain the battery cell assembly.

Brief Description of Drawings

0007<ul id="ul0001" list-style="none" compact="compact"><li><figref idref="f0001">Figure 1</figref> is an exploded schematic of a battery cell assembly in accordance with an exemplary embodiment;</li><li><figref idref="f0001">Figure 2</figref> is a schematic of a first panel member utilized in the battery cell assembly of <figref idref="f0001">Figure 1</figref>;</li><li><figref idref="f0002">Figure 3</figref> is another schematic of the first panel member utilized in the battery cell assembly of <figref idref="f0001">Figure 1</figref>;</li><li><figref idref="f0002">Figure 4</figref> is a schematic of a portion of the heat exchanger utilized in the battery cell assembly of <figref idref="f0001">Figure 1</figref>;</li><li><figref idref="f0002">Figure 5</figref> is a cross-sectional schematic of a portion of the heat exchanger of <figref idref="f0002">Figure 4</figref>;</li><li><figref idref="f0003">Figure 6</figref> is a cross-sectional schematic of a portion of the battery cell assembly of <figref idref="f0001">Figure 1</figref>;</li><li><figref idref="f0003">Figure 7</figref> is a schematic of a second panel member utilized in the battery cell assembly of <figref idref="f0001">Figure 1</figref>;</li><li><figref idref="f0003">Figure 8</figref> is another schematic of the second panel member utilized in the battery cell assembly of <figref idref="f0001">Figure 1</figref>;</li><li><figref idref="f0004">Figure 9</figref> is a flowchart of a method for assembling the battery cell assembly of <figref idref="f0001">Figure 1</figref>;</li><li><figref idref="f0004">Figure 10</figref> is a schematic of a coolant system coupled to the battery cell assembly of <figref idref="f0001">Figure 1</figref>; and</li><li><figref idref="f0005">Figure 11</figref> is a schematic of a battery system including the battery cell assembly of <figref idref="f0001">Figure 1</figref> and two additional battery cell assemblies.</li></ul>

Best Mode for Carrying out the Invention

0008Referring to <figref idref="f0001">Figure 1</figref>, a battery cell assembly 10 is illustrated. The battery cell assembly 10 includes a panel member 30, a grommet 32, a battery cell 34, a heat exchanger 36, a battery cell 38, a grommet 40, and a panel member 42.

0009An advantage of the battery cell assembly 10 is that the battery cell assembly 10 includes a heat exchanger 36 with thermally conductive layers to remove heat from the battery cells 34, 38.

0010Referring to <figref idref="f0001 f0002">Figures 1-3</figref>, the panel member 30 is configured to hold the battery cell 34 against the heat exchanger 36. The panel member 30 includes a rectangular ring-shaped frame 48 that defines an interior space 50. The panel member 30 has a side 52 and a side 54 opposite the side 52. The panel member 30 further includes apertures 56, 58, 60, 62 extending into the side 52 for receiving portions of fasteners (not shown). In one exemplary embodiment, the panel member 30 is constructed from plastic. In other alternative embodiments, the panel member 30 can be constructed from other materials known to those skilled in the art.

0011The grommet 32 is configured to apply a holding force against the battery cell 34. The grommet 32 is disposed between the panel member 30 and the battery cell 32. The grommet 32 is generally rectangular ring-shaped and is constructed of a pliable material such as a rubber compound.

0012Referring to <figref idref="f0001">Figures 1</figref> and <figref idref="f0003">6</figref>, the battery cell 34 is provided to output an operational voltage between the electrical terminals 68, 69. The battery cell 34 includes a body portion 66 and a peripheral lip portion 67 extending around the body portion 66, and electrical terminals 68, 69 extending from the body portion 66. The battery cell 34 is generally rectangular shaped and includes a side 70 and a side 72 opposite the side 70. In one exemplary embodiment, the battery cell 34 is a lithium battery cell. Of course, in alternative embodiments, the battery cell 34 can comprise other types of battery cells known to those skilled in the art. The size of the peripheral lip portion 67 is substantially equal to a size of the panel member 30 such that the panel member 30 covers the peripheral lip portion 67 of the battery cell 34. The battery cell 34 is disposed between the panel member 30 and the heat exchanger 36.

0013Referring to <figref idref="f0001">Figures 1</figref>, <figref idref="f0002">4 and 5</figref>, the heat exchanger 36 is provided to remove heat from the battery cells 34, 38. The heat exchanger 36 is disposed between the battery cell 34 and the battery cell 38. The heat exchanger 36 includes a rectangular ring-shaped frame 90, an inlet port 92, an outlet port 94, cross-members 96, 98 and thermally conductive layers 100, 102. It should be noted that cross-members 96, 98 are optional.

0014The rectangular ring-shaped frame 90 is provided to define an interior space 110 for receiving a liquid therein. The rectangular ring-shaped frame 90 has a side 160 and a side 162 opposite the side 160. The rectangular ring-shaped frame 90 further includes elongated apertures 112, 114 extending therein. The elongated aperture 112 extends from the inlet port 92 along a first portion of the rectangular ring-shaped frame 90 and fluidly communicates with apertures 116, 118, 120, 122, 124, 126 that fluidly communicate with the interior space 110. The elongated aperture 114 extends from the outlet port 94 along a second portion of the rectangular ring-shaped frame 90 and fluidly communicates with apertures 140, 142, 144, 146, 148, 150 that fluidly communicate with the interior space 110. In one exemplary embodiment, the rectangular ring-shaped frame 90 is constructed from plastic. Of course, in alternative embodiments, the rectangular ring-shaped frame 90 can be constructed from other materials known to those skilled in the art.

0015The cross-members 96, 98 are disposed across the interior space 110 and are coupled to first and second portions of the rectangular ring-shaped frame 90 to partition the interior space 110 into regions 170, 172, and 174. The cross-members 96, 98 are utilized to guide a flow of liquid coolant within the interior space 110 to even out heat exchange across the heat exchanger surfaces. In one exemplary embodiment, the cross-members 96, 98 are constructed from plastic. Of course, in alternative embodiments, the cross-members 96, 98 can be constructed from other materials known to those skilled in the art.

0016The inlet port 92 is configured to receive a liquid into route the liquid through the elongated aperture 112 to the apertures 116, 118, 120, 122, 124 and 126. The inlet port 92 is coupled to a first portion of the rectangular ring-shaped frame 90. In alternative embodiments, the inlet port 92 can be located anywhere along the perimeter of the frame 90.

0017The outlet port 94 is configured to receive the liquid from the interior space 110 via the apertures 140, 142, 144, 146, 148, 150 and the elongated aperture 114.

0018The outlet port 94 is coupled to the second portion of the rectangular ring-shaped frame 90.

0019Referring to <figref idref="f0001">Figures 1</figref> and <figref idref="f0002">4</figref>, the thermally conductive layers 100, 102 are provided to transfer heat from the battery cells 34, 38 into a liquid contained within the interior space 110. The thermally conductive layer 100 is disposed on the side 160 of the rectangular ring-shaped frame 90. The thermally conductive layer 102 is disposed on the side 162 of the rectangular ring-shaped frame 90. In one exemplary embodiment, the thermally conductive layers 100, 102 are constructed from aluminum. Of course, in alternative embodiments, other materials known to those skilled in the art, such as stainless steel or flexible laminated materials could be utilized to construct the thermally conductive layers 100, 102. In one exemplary embodiment, the thermally conductive layers 100, 102 are glued to the sides 160, 162 of the rectangular ring-shaped frame 90 such that the interior space 110 is enclosed by the thermally conductive layers 100, 102. In an alternative embodiment, the ring-shaped frame 90 can be molded over the thermally conductive layers 100, 102.

0020During operation of the heat exchanger 36, the inlet port 92 receives a liquid which is routed through the elongated aperture 112 and the apertures 116, 118, 120, 122, 124, 126 into the interior space 110. In the interior space 110, the liquid absorbs heat from the thermally conductive layers 100, 102 and is routed through the apertures 140, 142, 144, 146, 148, 150 into the elongated aperture 114. From the elongated aperture 114, the liquid is routed out the outlet port 94. Thus, heat produced by the battery cells 34, 38 is transferred through the thermally conductive layers 100, 102, respectively, into the liquid which is routed out of the heat exchanger 36. As a result, a temperature of the battery cells 36, 38 is maintained within a desired temperature range utilizing the heat exchanger 36.

0021Referring to <figref idref="f0001">Figures 1</figref> and <figref idref="f0003">6</figref>, the battery cell 38 is provided to output an operational voltage between the electrical terminals 192, 194. The battery cell 38 includes a body portion 190 and a peripheral lip portion 191 extending around the body portion 190, and the electrical terminals 192, 194 extending from the body portion 190. The battery cell 38 is generally rectangular shaped and includes a side 196 and a side 198 opposite the side 196. In one exemplary embodiment, the battery cell 38 is a lithium battery cell. Of course, in alternative embodiments, the battery cell 384 can comprise other types of battery cells known to those skilled in the art. The size of the peripheral lip portion 191 is substantially equal to a size of the panel member 42 such that the panel member 42 covers the peripheral lip portion 191 of the battery cell 38. The battery cell 38 is disposed between the heat exchanger 36 and the panel member 42.

0022The grommet 40 is configured to apply a holding force against the battery cell 38. The grommet 40 is disposed between the panel member 42 and the battery cell 38. The grommet 40 is generally rectangular ring-shaped and is constructed of a pliable material such as a rubber compound.

0023The panel member 42 is configured to hold the battery cell 38 against the heat exchanger 36. The panel member 42 includes a rectangular ring-shaped frame 210 that has an interior space 212. The panel member 42 has a side 214 and a side 216 opposite the side 214. The panel member 42 further includes apertures 230, 232, 234, 236 extending into the side 210 for receiving portions of fasteners (not shown). In one exemplary embodiment, the panel member 42 is constructed from plastic. In other alternative embodiments, the panel member 42 can be constructed from other materials known to those skilled in the art.

0024Referring to <figref idref="f0004">Figure 9</figref>, a flowchart of a method for assembling in the battery cell assembly 10 will now be explained.

0025At step 260, an operator obtains the battery cell 34, grommets 32, 40, the rectangular ring-shaped frame 90, thermally conductive layers 100, 102, panel members 30, 42, and the battery cell 38. The battery cell 34 has the side 70 and the side 72 opposite the side 70. The rectangular ring-shaped frame 90 has the interior space 110 extending therethrough. The rectangular ring-shaped frame 90 further has the side 160 and the side 162 opposite the side 160. The battery cell 38 has the side 196 and the side 198 opposite the side 196.

0026At step 262, the operator disposes the grommet 32 on the panel member 30 and the grommet 40 on the panel member 42.

0027At step 264, the operator disposes the panel member 30 on at least a portion of the side 70 of the battery cell 34, such that the grommet 32 is disposed between panel member 30 and the battery cell 34.

0028At step 266, the operator disposes the thermally conductive layer 100 on the side 160 of the rectangular ring-shaped frame 90 covering the interior space 110.

0029At step 268, the operator disposes the thermally conductive layer 102 on the side 162 of the rectangular ring-shaped frame 90 covering the interior space 110.

0030At step 270, the operator disposes the battery cell 34 on the thermally conductive layer 100.

0031At step 272, the operator disposes the thermally conductive layer 102 on the side 190 of the battery cell 38.

0032At step 274, the operator disposes the side 198 of the battery cell 38 on the panel member 42 to obtain the battery cell assembly 10. The grommet 40 is disposed between the battery cell 38 and the panel member 42.

0033At step 276, the operator utilizes first, second, third, and fourth fasteners to fasten the battery cell assembly 10 together. In particular, the first fastener engages the apertures 56, 234 of the panel assemblies 30, 42, respectively. The second fastener engages the apertures 58, 236 of the panel assemblies 30, 42, respectively. The third fastener engages the apertures 60, 230 of the panel assemblies 30, 42, respectively. Further, the fourth fastener engages the apertures 62, 232 of the panel assemblies 30, 42, respectively.

0034Referring to <figref idref="f0004">Figure 10</figref>, a cooling system 290 that is utilized to route liquid through the heat exchanger 36 of the battery cell assembly 10 will now be explained. The cooling system 290 includes a reservoir 292, a conduit 296, a pump 298, and conduits 300, 302. The reservoir 292 is configured to hold a liquid 294 therein. The conduit 296 is fluidly coupled between the reservoir 292 and the pump 298. The conduit 300 is fluidly coupled between the pump 298 and the inlet port 92 of the heat exchanger 36. The pump 298 is configured to pump a portion of the liquid 294 from the reservoir 292 via the conduit 296, through the conduit 300 to the inlet port 92 of the heat exchanger 36. The portion of liquid 294 in the heat exchanger 36 absorbs heat from the battery cells 34, 38 and exits the heat exchanger 36 via the outlet port 94. Thereafter, the portion of liquid 294 is routed through the conduit 302 to the reservoir 292.

0035Referring to <figref idref="f0005">Figure 11</figref>, a battery system 310 which utilizes a plurality of battery cell assemblies stacked on top of one another is illustrated. As shown, the battery system 310 includes the battery cell assembly 10, a battery cell assembly 312, and a battery cell assembly 314. The battery cell assembly 10 is disposed on top of the battery cell assembly 312. The battery cell assembly 312 is disposed on top of the battery cell assembly 314. It should be noted that although battery system 310 includes three battery cell assemblies, in alternative embodiments, the battery system 310 could include fewer than three battery cell assemblies or greater than three battery cell assemblies.

0036While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed for carrying this invention, but that the invention will include all embodiments falling within the scope of the appended claims. Moreover, the use of the terms, first, second, etc. are used to distinguish one element from another. Further, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced items.

Industrial Applicability

0037The battery cell assembly 10 and the method for assembling the battery cell assembly 10 represent a substantial advantage over other assemblies and methods. In particular, the battery cell assembly 10 provides a technical effect of utilizing a heat exchanger 36 with a thermally conductive layer to remove heat from a battery cell disposed adjacent the thermally conductive layer. Thus, a temperature of the battery cell can be maintained within a desired temperature range to prevent degradation of the battery cell.