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CN-121986406-A - Battery pack, structure, and method for manufacturing mica plate

CN121986406ACN 121986406 ACN121986406 ACN 121986406ACN-121986406-A

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 a fixing member for fixing the mica plate, a first fixing member hole portion penetrating from the first main surface to the second main surface is formed in the mica plate, a connecting member having a second fixing member hole portion is provided in the module and/or the case, the fixing member includes a head portion and a main body portion connected to the head portion, the head portion of the fixing member is located on the first main surface side of the mica plate, the main body portion of the fixing member passes through the first fixing member hole portion and is inserted into the second fixing member hole portion to fix the mica plate, and the head portion covers at least a portion of a contour of the first fixing member hole portion and overlaps with the head portion of the mica plate in a plan view of the mica plate by an area S5 times that of the head portion overlaps with the mica plate S2.

Inventors

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

Assignees

  • 揖斐电株式会社

Dates

Publication Date
20260505
Application Date
20240924
Priority Date
20231012

Claims (19)

  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 also has a fixing member for fixing the mica board, A first fixing member hole portion penetrating from the first main surface to the second main surface is formed in the mica plate, A connecting member having a hole portion for a second fixing member is provided in the module and/or the housing, The fixing part comprises a head part and a main body part connected with the head part, The head of the fixing member is located on the first main surface side of the mica board, The main body portion of the fixing member passes through the first fixing member hole portion and is inserted into the second fixing member hole portion to fix the mica board, The head portion covers at least a part of the outline of the first fixing member hole portion and overlaps the mica plate when the mica plate is seen in a top view, The area S1 of the portion of the head overlapping the mica plate is 5.8X10 -6 times or more the area S2 of the mica plate.
  2. 2. The battery pack of claim 1, wherein, The fixing member is at least one shape selected from the group consisting of rivet-like, spring pin-like, push pin-like, lock pin-like, and step pin-like.
  3. 3. The battery pack of claim 1, wherein, The fixing part is in the shape of a rivet, The second fixing member hole portion is a through hole, The main body portion of the fixing member is passed through the first fixing member hole portion and the second fixing member hole portion, and a caulking portion is formed at a distal end of the main body portion.
  4. 4. The battery pack of claim 1, wherein, The fixing part is in the shape of a screw, The second fixing part hole part is a threaded hole, The main body portion of the fixing member is screwed into the second fixing member hole portion.
  5. 5. The battery pack according to any one of claims 1 to 4, wherein, The mica board is fixed by a plurality of the fixing members, When the mica plate is seen in a plan view, the area S1n of the portion of the head portion of one of the fixing members, which overlaps the mica plate, is larger than the opening area S3 of the hole portion for the first fixing member.
  6. 6. 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 also has a fixing member for fixing the mica board, A first fixing member hole portion penetrating from the first main surface to the second main surface is formed in the mica plate, A connecting member having a hole portion for a second fixing member is provided in the module and/or the housing, The fixing member is rivet-shaped and includes a head portion and a body portion connected to the head portion, The head of the fixing member is located on the first main surface side of the mica board, The main body of the fixing member is passed through the first fixing member hole and the second fixing member hole, a caulking portion is formed at a front end of the main body, The shortest distance from the contour of the first fixing member hole portion to the end portion of the caulking portion exceeds 0mm and is 22mm or less when the mica plate is seen in a top view.
  7. 7. The battery pack of claim 6, wherein, The shortest distance from the contour of the first fixing member hole portion to the end portion of the caulking portion is longer than the shortest distance from the contour of the first fixing member hole portion to the end portion of the head portion when the mica plate is seen in a top view.
  8. 8. The battery pack according to claim 6 or 7, wherein, The mica plate is fixed by a plurality of the fixing members.
  9. 9. The battery pack according to any one of claims 1 to 8, 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, A pair of the first fixing member hole portions is formed in 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.
  10. 10. The battery pack according to any one of claims 1 to 9, wherein, An annular washer is disposed between the head and the mica plate, The body portion passes through a ring of the gasket.
  11. 11. The battery pack according to any one of claims 1 to 10, wherein, On the first main surface side of the mica plate, a protruding strip is provided extending in a first direction.
  12. 12. The battery pack according to any one of claims 1 to 10, wherein, A first protrusion is formed on the first main surface side of the mica plate.
  13. 13. The battery pack according to any one of claims 1 to 12, wherein, The mica plate has a thickness T of 0.1mm or more and 3.0mm or less.
  14. 14. The battery pack according to any one of claims 1 to 13, wherein, The mica plate has a Young's modulus of 110GPa or less.
  15. 15. The battery pack according to any one of claims 1 to 14, 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.
  16. 16. The battery pack of claim 15, 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.
  17. 17. A structure comprising a mica plate having a first main surface and a second main surface opposite to the first main surface, a base material having a first fixing member hole penetrating from the first main surface to the second main surface, and a fixing member provided with a connecting member having a second fixing member hole, the fixing member fixing the mica plate, It is characterized in that the method comprises the steps of, The fixing part comprises a head part and a main body part connected with the head part, The head of the fixing member is located on the first main surface side of the mica board, The main body portion of the fixing member passes through the first fixing member hole portion and is inserted into the second fixing member hole portion to fix the mica board, The head portion covers at least a part of the outline of the first fixing member hole portion and overlaps the mica plate when the mica plate is seen in a top view, The area S1 of the portion of the head overlapping the mica plate is 5.8X10 -6 times or more the area S2 of the mica plate.
  18. 18. A structure comprising a mica plate having a first main surface and a second main surface opposite to the first main surface, a base material having a first fixing member hole penetrating from the first main surface to the second main surface, and a fixing member provided with a connecting member having a second fixing member hole, the fixing member fixing the mica plate, It is characterized in that the method comprises the steps of, The fixing member is rivet-shaped and includes a head portion and a body portion connected to the head portion, The head of the fixing member is located on the first main surface side of the mica board, The main body of the fixing member is passed through the first fixing member hole and the second fixing member hole, a caulking portion is formed at a front end of the main body, When the mica plate is seen in a top view, the shortest distance from the outline of the first fixing member hole to the end of the caulking portion is greater than 0mm and 22mm or less.
  19. 19. A method for manufacturing a mica plate is characterized in that, The manufacturing method of the mica plate comprises the following steps: A molding step of placing a mica prepreg in a mold and hot-pressing the mica prepreg to form a mica plate having a first main surface and a second main surface opposite to the first main surface, and And a first fixing member hole forming step of forming a first fixing member hole penetrating from the first main surface to the second main surface in the mica plate.

Description

Battery pack, structure, and method for manufacturing mica plate Technical Field The present invention relates to a battery pack, a structure, and a method for manufacturing a mica plate. 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 That is, the battery pack according to the first aspect 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 a fixing member for fixing the mica plate, a first fixing member hole portion penetrating from the first main surface to the second main surface is formed in the mica plate, a connecting member having a second fixing member hole portion is provided in the module and/or the case, the fixing member includes a head portion and a main body portion connected to the head portion, the head portion of the fixing member is positioned on the first main surface side of the mica plate, the main body portion of the fixing member passes through the first fixing member hole portion and is inserted into the second fixing member hole portion to fix the mica plate, and the head portion covers at least a portion of the first contour portion and overlaps the mica plate S2 x 5 in a plane view of the mica plate. If a hole is provided in the mica plate, and the mica plate is fixed to the hole by a fixing member having a head portion and a body portion, a high stress is easily applied to the periphery of the hole when an impact is applied. However, as in the present invention described above, if the ratio of the area S1 to the area S2 is in the above range, the stress can be dispersed to the head of the fixing member, and the stress can be relaxed. In the battery pack according to the first aspect of the present invention, the fixing member may be at least one shape selected from the group consisting of rivet-like, spring pin-like, push pin-like, lock pin-like, and stepped pin-like. The fixing member may be rivet-shaped, the second fixing member hole may be a through hole, the main body portion of the fixing member may pass through the first fixing member hole and the second fixing member hole, and a caulking portion may be formed at a distal end of the main body portion. The fixing member may be screw-shaped, the second fixing member hole may be a screw hole, and the main body of the fixing member may be screwed into the second fi