Battery pack

Abstract

The utility model relates to a battery pack which inhibits interference between a battery unit and a shell even if a load from a direction perpendicular to a stacking direction of a battery module is input into the battery pack. The battery pack includes: a battery module including a laminated body in which a plurality of battery cells are laminated; the battery pack includes a plurality of battery modules, and a case that accommodates the plurality of battery modules, in which the plurality of battery modules are arranged side by side in a width direction of the case, the battery pack includes a heat insulating plate that is arranged between adjacent battery modules and faces an entire side surface area of the battery modules. Among the plurality of battery modules arranged at least on the outermost side in the width direction of the case, the battery cell located at the center of the laminated body in the lamination direction is fixed to the heat insulating plate.

Description

Technical Field

[0001] This utility model relates to battery packs. Background Technology

[0002] Patent document 1 discloses a battery pack in which a battery module having multiple battery cells stacked on top of each other is housed in a housing in a multi-row configuration.

[0003] [Existing technical documents]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-107092 Utility Model Content

[0006] The problem to be solved by the utility model

[0007] When a load is applied to the battery pack in a direction perpendicular to the stacking direction of the battery modules, the battery cells may protrude (bulge) into the width direction of the housing, potentially interfering with the housing. When the battery cells interfere with the inner surface of the housing, they deform. This deformation can lead to smoke and fire; therefore, preventing battery cell deformation is desirable.

[0008] This invention was made in view of the above circumstances, and its purpose is to provide a battery pack that can suppress interference between the battery cells and the housing even when a load is input from a direction perpendicular to the stacking direction of the battery modules.

[0009] Methods for solving problems

[0010] This utility model relates to a battery pack, comprising: a battery module, including a stacked body formed by stacking multiple battery cells; and a housing, which houses multiple battery modules, wherein multiple battery modules are arranged in a width direction inside the housing. The battery pack is characterized by having a heat insulation plate disposed between adjacent battery modules and facing the entire side area of ​​the battery modules. At least one of the multiple battery modules is disposed in the outermost battery module in the width direction of the housing, and the battery cell located at the center of the stacking direction of the stacked body is fixed to the heat insulation plate.

[0011] Utility Model Effect

[0012] In this invention, even when a load is input from a direction perpendicular to the stacking direction of the battery module, interference between the battery cell and the housing can be suppressed. Attached Figure Description

[0013] Figure 1This is a schematic diagram showing a vehicle equipped with the battery pack described in the embodiment.

[0014] Figure 2 This is a diagram used to illustrate the structure of a battery pack.

[0015] Figure 3 This diagram illustrates the relationship between the inner surface of the housing and the configuration of the battery module.

[0016] Figure 4 This diagram is used to illustrate a side-impact collision of a vehicle.

[0017] Figure 5 This diagram illustrates the loads exerted on the battery pack by a side impact.

[0018] Figure 6 This is a diagram showing the state of the battery pack under load input during a side impact.

[0019] Figure 7 This is a diagram used to illustrate the structure of the battery pack in the comparative example.

[0020] Figure 8 This is a diagram used to illustrate the configuration relationship between the inner surface of the housing and the battery module in the comparative example.

[0021] Figure 9 This diagram illustrates the effect of a load caused by a side impact on the battery pack in the construction of a comparative example.

[0022] Figure 10 This is a diagram showing the state of the battery pack in the comparative example when a side-impact load is input. Detailed Implementation

[0023] The battery pack in the embodiments of this utility model will be described in detail below. However, this utility model is not limited to the embodiments described below.

[0024] Figure 1 This is a schematic diagram showing a vehicle equipped with the battery pack described in the embodiment. The battery pack 1 is mounted on the vehicle Ve. The vehicle Ve uses the electricity stored in the battery pack 1 to operate. The battery pack 1 includes a housing 2 and multiple battery modules 3. Furthermore, in... Figure 1 The image shows a top view of vehicle Ve.

[0025] Housing 2 is the battery pack housing mounted on the body of vehicle Ve. Housing 2 houses multiple battery modules 3. Inside housing 2, the multiple battery modules 3 are arranged in the width direction of housing 2. Figure 2As shown, housing 2 houses four battery modules 3A, 3B, 3C, and 3D. From left to right in the vehicle width direction, battery module 3A, 3B, 3C, and 3D are arranged sequentially. When housing 2 is mounted on vehicle Ve, the width direction of housing 2 is the same as the width direction of vehicle Ve (vehicle width direction), and the length direction of housing 2 is the same as the front-rear direction of vehicle Ve. The left side in the vehicle width direction is the left side facing the front (FR) direction of vehicle Ve. In this description, unless specifically distinguished, battery modules 3A to 3D are referred to simply as battery module 3.

[0026] like Figure 2 As shown, the battery pack 1 includes a heat insulation plate 4 disposed between the battery modules 3. The heat insulation plate 4 is used for heat insulation between the battery cells 5 ( Figure 3 (As shown) A component that prevents adjacent battery modules 3 from being heated in the event of thermal runaway. A heat insulation plate 4 extends along the stacking direction of the battery modules 3 and is formed to face the entire side area of ​​the battery modules 3. The heat insulation plate 4 is fixed to the housing 2. A first heat insulation plate 4A is disposed between the first battery module 3A and the second battery module 3B. A second heat insulation plate 4B is disposed between the second battery module 3B and the third battery module 3C. A third heat insulation plate 4C is disposed between the third battery module 3C and the fourth battery module. Furthermore, in Figure 2 The diagram shows a top view of the battery pack 1. In this description, without specifically distinguishing between the first to third heat insulation plates 4A to 4C, they are simply referred to as heat insulation plate 4.

[0027] like Figure 3 As shown, the battery module 3 has a stacked body 6 composed of multiple battery cells 5, a pair of end plates 7A and 7B, and an intermediate plate 8. The stacked body 6 has a stacked structure in which battery cells 5 and resin frames are alternately arranged. The pair of end plates 7A and 7B are disposed at both ends of the stacked body 6 in the stacking direction. The intermediate plate 8 is disposed at the middle position of the battery module 3. The end plates 7 and the intermediate plate 8 are fixed to the housing 2. In this description, unless one end plate 7A and the other end plate 7B are specifically distinguished, they are simply referred to as end plate 7.

[0028] The battery module 3 has a structure that clamps the laminate 6 in the stacking direction via end plates 7 and constraint straps. Two constraint straps are arranged above and below the laminate 6, extending along the stacking direction to connect a pair of end plates 7A and 7B. One end of each constraint strap is fixed to one end plate 7A, and the other end is fixed to the other end plate 7B. In the battery module 3, the constraint straps suppress vertical movement of the battery cells 5. Furthermore, in... Figure 3 The diagram of the constraint band is omitted in the text.

[0029] Here, the structure of battery pack 1 and the structure of battery pack 100 of the comparative example will be compared and explained. Figures 7-10 The comparative example battery pack 100 is shown in the figure. Figure 7 , Figure 8 As shown, in the comparative example battery pack 100, the battery cells 5 of battery module 103 are not bonded to the heat insulation plate 104. The first heat insulation plate 104A is disposed between the first battery module 103A and the second battery module 103B, configured to cover the second battery module 103B. Figure 8 , Figure 9 As shown, when the load caused by a side collision acts as an input to the vehicle on the battery pack 100, the battery cell 105 of the first battery module 103A protrudes in the width direction, and the central battery cell 105A interferes with the inner surface 102a of the housing 102. Figure 10 As shown, the second battery module 103B is pressed against the first heat insulation plate 104A and the second heat insulation plate 104B without gap, and the third battery module 103C is pressed against the second heat insulation plate 104B and the third heat insulation plate 104C without gap, without corrugation deformation and without interference. However, in the first battery module 103A and the fourth battery module 103D, wrinkling deformation caused by inertia occurs when subjected to lateral input such as a collision. As a result, interference occurs between the first battery module 103A and the inner surface 102a of the housing 102, and interference occurs between the fourth battery module 103D and the inner surface 102a of the housing 102.

[0030] On the other hand, in the battery pack 1, the first heat insulation plate 4A is configured to cover the first battery module 3A. In this embodiment, the configuration of the first heat insulation plate 4A is changed compared to the comparative example. Furthermore, in the battery pack 1, the side of the battery module 3 is bonded and fixed to the heat insulation plate 4.

[0031] like Figure 2As shown, the side of the first battery module 3A is fixed to the first heat insulation plate 4A by adhesive 9. Similarly, the side of the fourth battery module 3D is fixed to the third heat insulation plate 4C by adhesive 9. Furthermore, the side of the third battery module 3C is fixed to the second heat insulation plate 4B by adhesive 9. Although the second battery module 3B is sandwiched between the first heat insulation plate 4A and the second heat insulation plate 4B, it is not fixed to the heat insulation plate 4. Since the gap between the battery modules 3 is narrow, there is almost no gap due to the heat insulation plate 4. Therefore, the second battery module 3B is sandwiched between the first heat insulation plate 4A and the second heat insulation plate 4B and does not move in the width direction, so there is no problem even if it is not glued to the heat insulation plate 4. The first battery module 3A and the fourth battery module 3D must be glued to the heat insulation plate 4. Either the second battery module 3B or the third battery module 3C is glued to the heat insulation plate 4. In the battery pack 1, among the multiple battery modules 3, at least the outermost battery module is arranged in the width direction of the housing 2, and the battery cell 5 located at the center of the stacking direction of the stack body 6 is fixed to the heat insulation plate 4.

[0032] like Figure 3 As shown, adhesive 9 is applied between the first battery module 3A and the first heat insulation plate 4A to bond and fix the battery cells 5 of the first battery module 3A to the first heat insulation plate 4A. The battery cells 5 are bonded to the heat insulation plate 4A with minimal application of adhesive. Adhesive 9 is applied only to the central battery cell 5A, which is the most prominent in the width direction during a side impact, among the multiple battery cells 5 included in the first battery module 3A. The battery cell 5 to be bonded is the central battery cell 5A. The central battery cell 5A is the battery cell located at the center in the stacking direction among the battery cells 5 disposed between the end plate 7 and the intermediate plate 8.

[0033] For example, in the case where ten battery cells 5 are stacked between a pair of end plates 7A and 7B, five battery cells 5 are stacked between one end plate 7A and the middle plate 8, and five battery cells 5 are stacked between the other end plate 7B and the middle plate 8. In this case, the central battery cell 5A consists of two cells: one located at the center of the stacking direction between one end plate 7A and the middle plate 8, and the other located at the center of the stacking direction between the other end plate 7B and the middle plate 8. Adhesive 9 is applied only to the two battery cells 5 that become the central battery cells 5A. Figure 4 As shown, assume vehicle Ve is subjected to a side impact. If only the most prominent central battery unit 5A is bonded and fixed to the heat insulation plate 4, interference with the housing 2 caused by the corrugated deformation of the laminate 6 can be prevented. Since the central battery unit 5A is fixed to the heat insulation plate 4, therefore... Figure 5 As shown, battery module 3 moves as a whole following the load input direction. Therefore, as... Figure 6As shown, the battery module 3 does not undergo corrugated deformation, and the battery unit 5 does not interfere with the housing 2.

[0034] As explained above, according to the embodiment, when a load from a direction perpendicular to the stacking direction of the battery module acts on the battery pack 1 due to a side collision of the vehicle Ve, etc., interference between the battery cell 5 and the inner surface 2a of the housing 2 can be suppressed.

[0035] Explanation of reference numerals in the attached figures

[0036] 1 battery pack

[0037] 2 shells

[0038] 3 battery modules

[0039] 4 heat insulation panels

[0040] 5 battery units

[0041] 6-layer stack

[0042] 7-end plate

[0043] 8 intermediate plates

[0044] 9. Adhesive.

Claims

1. A battery pack, comprising: A battery module, comprising a stack of multiple battery cells; and The housing contains multiple battery modules. Inside the housing, a plurality of battery modules are arranged in a symmetrical configuration along the width of the housing. Its features are, The battery pack includes heat insulation plates disposed between adjacent battery modules and facing the entire side area of ​​the battery modules. In at least one of the battery modules disposed on the outermost side in the width direction of the housing, the battery cell located at the center of the stacking direction of the laminate is fixed to the heat insulation plate.

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