CN-122029671-A - Battery pack and structure

Abstract

Provided is a battery pack having a lightweight mica plate that is less likely to be broken. The battery pack of the present invention includes a module having a plurality of battery cells, a case accommodating the module, and a mica plate disposed between the module and the case and having a first main surface and a second main surface opposite to the first main surface, wherein the battery pack further includes an adhesive member disposed on a surface of the mica plate and fixing the mica plate, and an area S1 of the adhesive member is 5.8X10 ‑6 times or more an area S2 of the mica plate when the mica plate is seen in plan view.

Inventors

• MUKAIYAMA KENJI
• An Tengshou
• Li Yuan Dahui
• Yamamoto O, too

Assignees

• 揖斐电株式会社

Dates

Publication Date

20260512

Application Date

20240924

Priority Date

20231012

Claims (15)

1. 1. A battery pack, having: A module having a plurality of battery cells; A housing accommodating the module, and A mica plate disposed between the module and the housing, having a first main surface and a second main surface opposite to the first main surface, It is characterized in that the method comprises the steps of, The battery pack further has an adhesive member disposed on a surface of the mica board and fixing the mica board, The area S1 of the adhesive member is 5.8X10 -6 times or more the area S2 of the mica plate when the mica plate is seen in plan view.
2. 2. The battery pack of claim 1, wherein, The bonding member bonds the module and/or the housing with the mica board.
3. 3. The battery pack of claim 1, wherein, A connecting part is provided at the module and/or the housing, The bonding member bonds the connection member with the mica board.
4. 4. The battery pack according to any one of claims 1 to 3, wherein, The mica boards are bonded by a plurality of the bonding members.
5. 5. The battery pack according to any one of claims 1 to 4, wherein, The mica boards are generally quadrilateral in plan view, The mica board has a contour having a first edge and a second edge that is an opposite side of the first edge when the mica board is viewed from above, An end portion to which the first side in the mica board belongs and an end portion to which the second side in the mica board belongs are fixed by the adhesive member.
6. 6. The battery pack according to any one of claims 1 to 5, wherein, When the mica plate is seen in a plan view, the area S1n of one adhesive member is 5.8X10 -6 times or more the area S2 of the mica plate.
7. 7. The battery pack according to any one of claims 1 to 6, wherein, The adhesive member is a cured product of an adhesive.
8. 8. The battery pack according to any one of claims 1 to 6, wherein, The adhesive member is an insert molding.
9. 9. The battery pack according to any one of claims 1 to 8, wherein, On the first main surface side of the mica plate, a protruding strip is provided extending in a first direction.
10. 10. The battery pack according to any one of claims 1 to 8, wherein, A first protrusion is formed on the first main surface side of the mica plate.
11. 11. The battery pack according to any one of claims 1 to 10, wherein, The mica plate has a thickness T of 0.1mm or more and 3.0mm or less.
12. 12. The battery pack according to any one of claims 1 to 11, wherein, The mica plate has a Young's modulus of 110 GPa or less.
13. 13. The battery pack according to any one of claims 1 to 12, wherein, A safety valve is formed at a surface of the module, The mica plate is located between the surface of the module on which the safety valve is formed and the housing, The mica plate has a relief valve hole portion formed therein to expose the relief valve.
14. 14. The battery pack of claim 13, wherein, The shell is composed of a containing part and a cover part covering the containing part, The module is accommodated in the accommodating part in a manner that the safety valve is positioned on the cover part side, The mica board is disposed between the module and the cover.
15. 15. A structure, characterized in that, The structure comprises: an adherend; A mica plate having a first main surface and a second main surface opposite to the first main surface, and An adhesive member disposed on a surface of the mica plate and fixing the mica plate to the adherend, The area S1 of the adhesive member is 5.8X10 -6 times or more the area S2 of the mica plate when the mica plate is seen in plan view.

Description

Battery pack and structure Technical Field The present invention relates to a battery pack and a structure. Background In a battery pack in which a module having a plurality of battery cells is housed in a case, gas or flame may be generated during thermal runaway. Such gas and flame spread around, and further thermal runaway may be induced. In order to prevent gas and flame spread during such thermal runaway, patent document 1 discloses a battery pack in which a mica (mica) plate is disposed on the surface of a module. That is, patent document 1 discloses a battery pack including a battery module and a mica plate for heat insulation, the mica plate being detachably fixed to the battery module by a connection member that covers a plurality of the battery modules, the connection member being divided into an upper part and a lower part, the connection member fixing the mica plate to the battery module by an upper part, the connection member penetrating the battery module by a lower part to fix the battery module to a lower case, a support member for supporting the mica plate being provided between the mica plate and the battery module, the support member being fixed to an upper part of the connection member, a wear-resistant material that prevents friction between the holder and the mica plate being provided between the mica plate and the holder, the wear-resistant material being stuck to the mica plate and completely covering the holder. Prior art literature Patent literature Patent document 1 Chinese utility model No. 218334011 Disclosure of Invention Problems to be solved by the invention Conventionally, in order to facilitate handling of a battery pack, weight reduction of the battery pack has been demanded. If a mica plate is disposed in a battery pack as in patent document 1, there is a problem that the weight of the battery pack increases. As a method for reducing the weight of the battery pack as in patent document 1, a method for reducing the thickness of the mica plate is considered. However, in patent document 1, rivets are used when fixing the mica plate to the battery module, and in such a case, if the battery pack is impacted, the stress generated around the rivet hole increases. Therefore, if the mica plate is simply thinned, the strength of the mica plate is reduced, and the periphery of the rivet hole is easily broken. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a battery pack having a mica plate that is not easily broken and is lightweight. Means for solving the problems Specifically, the battery pack according to the present invention includes a module having a plurality of battery cells, a case accommodating the module, and a mica plate disposed between the module and the case and having a first main surface and a second main surface facing the first main surface, and further includes an adhesive member disposed on a surface of the mica plate and fixing the mica plate, wherein an area S1 of the adhesive member is 5.8X10 -6 times or more an area S2 of the mica plate when the mica plate is seen in plan view. If a hole is provided in the mica plate, and the mica plate is fixed by a rivet or the like through the hole, a high stress is easily applied to the periphery of the hole when an impact is applied. However, as in the present invention, when the mica board and the module are bonded by the adhesive member, if the ratio of the areas of S1 and S2 is within the above range, the stress can be dispersed, and the mica board can be prevented from being broken. In the battery pack of the present invention, the adhesive member adheres the module and/or the case to the mica board. In the battery pack according to the present invention, a connecting member may be provided to the module and/or the case, and the adhesive member may adhere the connecting member to the mica plate. Thus, in the battery pack of the present invention, the adhesive member may fix the module and/or the housing directly to the mica board, or may fix the module and/or the housing to the mica board via the connection member. In the battery pack of the present invention, it is preferable that the mica boards are bonded by a plurality of the bonding members. By bonding the mica boards at a plurality of locations, the bonding of the mica boards is stabilized. In the battery pack of the present invention, it is preferable that the mica plate has a substantially quadrangular shape in a plan view, and the mica plate has a contour having a first side and a second side which is an opposite side of the first side in a plan view, and an end portion to which the first side in the mica plate belongs and an end portion to which the second side in the mica plate belongs are fixed by the adhesive member. When the adhesive member is provided at such a position, the fixation of the mica plate is stabilized. In the battery pack of the present invention, it is pref