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CN-117480670-B - Battery module

CN117480670BCN 117480670 BCN117480670 BCN 117480670BCN-117480670-B

Abstract

The battery module is provided with a cooling plate (5) for cooling the cylindrical batteries (1) in a battery pack (4) in which a plurality of battery blocks (3) having bottom surfaces (11 a) of the plurality of cylindrical batteries (1) arranged on the same plane are connected in the axial direction of the cylindrical batteries (1). One end surface of the battery block (3) is set as a cooling surface (3A) on which a bottom surface (11 a) of the cylindrical battery (1) is arranged, the other end surface is set as a discharge surface (3B) on which an opening (13) of a discharge valve of the cylindrical battery (1) is arranged, a discharge passage gap (6) is provided between adjacent battery blocks (3) in the battery pack (4), and the cooling surface (3A) and the discharge surface (3B) are arranged on opposite surfaces of the passage gap (6). The cooling plate (5) is L-shaped, wherein the heat absorbing plate (5A) and the heat dissipating plate (5B) are connected, the heat absorbing plate (5A) is laminated on the cooling surface (3A) in a thermally coupled state, the heat dissipating plate (5B) is arranged on the outer surface of the battery pack (4), and a channel gap (6) is formed between the heat absorbing plate (5A) and the discharge surface (3B) of the battery block (3).

Inventors

  • Kohara Sunshine

Assignees

  • 松下新能源株式会社

Dates

Publication Date
20260505
Application Date
20220614
Priority Date
20210629

Claims (10)

  1. 1. A battery module is provided with: A plurality of battery blocks, wherein the bottom surfaces of the plurality of cylindrical batteries are arranged on the same plane; a battery pack in which a plurality of battery blocks are arranged in the axial direction of the cylindrical battery and connected, and A cooling plate for cooling the cylindrical batteries of the battery block, One end surface of the battery block is used as a cooling surface formed by arranging the bottom surface of the cylindrical battery on the same plane, the other end surface is used as a discharge surface formed by arranging the opening part of the discharge valve of the cylindrical battery, The battery packs provide an exhaust passage gap between adjacent ones of the battery blocks, The cooling surface and the discharge surface are arranged on the surfaces of the adjacent cell blocks facing each other in the channel gap, The cooling plate is L-shaped with a heat absorbing plate part and a heat dissipating plate part connected into a whole at right angles, The heat absorbing plate portion is laminated on the cooling surface of the battery block in a thermally coupled state, The heat dissipation plate portion is disposed on an outer surface of the battery pack, The battery pack is provided with a gap between the heat absorbing plate portion and the discharge surface of the battery block as a discharge passage gap.
  2. 2. The battery module of claim 1, wherein, The battery pack has a plurality of channel gaps, The plurality of cooling plates stacked on the cooling surface of each of the channel gaps are arranged on the same plane as the heat radiating plate portion.
  3. 3. The battery module according to claim 1 or 2, wherein, The battery block comprises a lead plate electrically connected with the bottom surface of each cylindrical battery, An insulating heat conduction sheet is arranged between the lead plate and the heat absorbing plate portion, The heat absorbing plate portion is disposed on the bottom surface of the cylindrical battery in a thermally coupled state via the insulating heat conductive sheet and the lead plate.
  4. 4. The battery module according to any one of claims 1 to 3, wherein, The battery block comprises a battery holder for arranging the cylindrical batteries in parallel, The battery pack is provided with the passage gap between the battery blocks via the battery holder.
  5. 5. The battery module according to any one of claims 1 to 4, wherein, The battery module includes a forced cooling member connected to the heat dissipation plate portion in a thermally coupled state.
  6. 6. The battery module according to any one of claims 1 to 5, wherein, The battery module includes an outer case accommodating the battery pack, The outer case is provided with: A pair of end plates disposed on both end surfaces of the battery pack; Side plates connecting the two side portions of the end plates and disposed on the two sides of the battery pack, and A bottom plate disposed on the bottom surface of the battery pack, The bottom plate has an exposure opening of the heat dissipation plate portion, The heat dissipation plate portion is disposed so as to be exposed at the exposure opening.
  7. 7. The battery module of claim 6, wherein, The battery block comprises a battery holder for arranging the cylindrical batteries in parallel, The side plate is fixed to the battery holder.
  8. 8. The battery module according to any one of claims 1 to 7, wherein, The battery block comprises a battery holder for arranging the cylindrical batteries in parallel, The cooling plate is fixed to the battery holder.
  9. 9. The battery module according to any one of claims 1 to 8, wherein, The battery block has a plurality of parallel blocks formed by connecting a plurality of cylindrical batteries in parallel, and the plurality of parallel blocks are connected in series.
  10. 10. The battery module according to any one of claims 1 to 9, wherein, The battery pack is formed by connecting adjacent battery blocks in series.

Description

Battery module Technical Field The present invention relates to a battery module including a plurality of cylindrical batteries, and more particularly, to a battery module capable of efficiently cooling a cylindrical battery. Background It is extremely important how a battery module including a plurality of cylindrical batteries efficiently dissipates heat energy from the cylindrical batteries that generate heat during charge and discharge, and maintains the battery temperature within a set range. In particular, in order to increase the output capacity, a plurality of cylindrical batteries are connected in series or in parallel, but it is also important to reduce the temperature difference by uniformly cooling each cylindrical battery. This is because abnormal temperature rise and temperature unevenness of the cylindrical battery cause a reduction in the life of the battery due to a reduction in the electrical characteristics of the battery. A battery module that dissipates heat energy of a cylindrical battery has been developed (see patent document 1). As shown in fig. 11, the battery module is configured such that a plurality of cylindrical batteries 91 are arranged in the width direction, a right side battery module 90A and a left side battery module 90B are provided, and the right side and left side battery modules 90 are arranged in a state in which the laminated heat conductive frame 92 further sandwiches the cooling member 93 by the right side heat conductive frame 92A and the left side heat conductive frame 92B. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2020-530936 Disclosure of Invention Problems to be solved by the invention The battery module of fig. 11 transfers heat energy of the right and left battery modules 90 to the pair of heat conductive frames 92 to dissipate the heat, and the cooling member 93 is interposed between the pair of heat conductive frames 92 to cool the heat conductive frames 92 on both sides by the cooling member 93. Since the battery module includes the right side heat conductive frame 92A and the left side heat conductive frame 92B stacked on both sides of the cooling member 93, the heat conductive frames 92 stacked on both sides are cooled by the cooling member 93, and therefore, the cooling member 93 cannot achieve heat dissipation from the surface, and further, since the heat conductive frames 92 on both sides are cooled by one cooling member 93, there is a disadvantage in that a large cooling capacity is required of the cooling member 93. The present invention has been developed to further eliminate the above-described drawbacks, and an object of the present invention is to provide a battery module capable of efficiently cooling a plurality of cylindrical batteries. Means for solving the problems A battery module according to an embodiment of the present invention includes a plurality of battery blocks each having bottom surfaces of a plurality of cylindrical batteries arranged on the same plane, a battery pack each having a plurality of battery blocks arranged in an axial direction of the cylindrical batteries and connected to each other, and a cooling plate for cooling the cylindrical batteries of the battery blocks. One end surface of the battery block is a cooling surface in which the bottom surface of the cylindrical battery is disposed on the same plane, and the other end surface is a discharge surface in which the opening of the discharge valve of the cylindrical battery is disposed. The battery pack has a passage gap for the exhaust material between adjacent battery blocks, and the adjacent battery blocks have cooling surfaces and exhaust surfaces on the surfaces facing the passage gap. The cooling plate is L-shaped with a heat absorbing plate part and a heat radiating plate part connected into a whole at right angles, the heat absorbing plate part is laminated on the cooling surface of the battery block in a thermal coupling state, the heat radiating plate part is arranged on the outer surface of the battery pack, and a gap is arranged between the heat absorbing plate part of the cooling plate and the discharge surface of the battery block as a channel gap of discharged materials. Effects of the invention The battery module can efficiently cool a plurality of cylindrical batteries, and prevent damage caused by temperature rise of the cylindrical batteries. Drawings Fig. 1 is a perspective view of a battery module according to an embodiment of the present invention. Fig. 2 is a top view of the battery module shown in fig. 1. Fig. 3 is a vertical sectional view of the battery module shown in fig. 2, taken along line III-III. Fig. 4 is an exploded perspective view of the battery module shown in fig. 1, as seen from the left side. Fig. 5 is an exploded perspective view of the battery module shown in fig. 1, as seen from the lower side. Fig. 6 is an exploded perspective view of a battery pack of the battery m