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JP-7856009-B2 - Battery pack

JP7856009B2JP 7856009 B2JP7856009 B2JP 7856009B2JP-7856009-B2

Inventors

  • 二宮 直哉
  • 川井 友博

Assignees

  • 三菱ケミカル株式会社

Dates

Publication Date
20260511
Application Date
20211222
Priority Date
20201222

Claims (13)

  1. A battery pack comprising multiple single cells stacked together, wherein at least one of the single cells has a partition member, The partition member has a heat insulating portion, and the compressive modulus of the heat insulating portion in the single cell stacking direction is 0.5 to 10 MPa. The partition member is provided with a support portion on the outside of the heat insulating portion in a planar direction perpendicular to the single cell stacking direction, and the support portion is in contact with the single cell. A battery pack in which the partition member has a non-contact area that does not come into contact with the individual cells.
  2. The battery pack according to claim 1, wherein the partition member is provided between each individual cell.
  3. The battery pack according to claim 1 or 2 , wherein the compressive modulus of the support portion in the single-cell stacking direction is 0.5 to 100 MPa.
  4. The battery pack according to any one of claims 1 to 3 , wherein the distance between the non-contact area and the single cell on the non-contact area is 0.1 to 2.5 mm.
  5. The battery pack according to any one of claims 1 to 4 , wherein the ratio of the area of the non-contact area ( SN ) to the area of the heat insulating part ( SI ) when viewed from above ( SN / SI ) is 0.3 to 1.
  6. The battery pack according to any one of claims 1 to 5 , wherein the ratio of the area of the support portion (S S ) to the area of the partition member (S P ) when viewed from above (S S / S P ) is 0.02 to 0.2.
  7. The battery pack according to any one of claims 1 to 6 , wherein the partition member, when viewed from above, is rectangular, and the support portion on the partition member is linear and forms at least one pair of opposite sides.
  8. The battery pack according to any one of claims 1 to 7 , wherein the heat insulating portion holds a liquid.
  9. The battery pack according to claim 8 , wherein the heat insulating portion is a porous heat insulating material, and the liquid is held in the porous heat insulating material.
  10. The battery pack according to any one of claims 1 to 9 , wherein the heat insulating part is housed in an outer casing.
  11. The battery pack according to claim 10 , wherein the outer casing is a laminate comprising a metal foil and a thermoplastic resin layer.
  12. The battery pack according to claim 11 , wherein the metal constituting the metal foil is at least one of aluminum, copper, tin, nickel, stainless steel, lead, tin-lead alloy, bronze, silver, iridium, and phosphor bronze.
  13. A method for manufacturing a battery pack consisting of multiple single cells stacked together, A partition member is placed between at least one of the aforementioned single cells, The partition member has a heat insulating portion, and the compressive modulus of the heat insulating portion in the single cell stacking direction is 0.5 to 10 MPa. The partition member is provided with a support portion on the outside of the heat insulating portion in a plane direction perpendicular to the single cell stacking direction, the support portion is in contact with the single cell, and the partition member is fixed in a state where pressure is applied in the thickness direction of the heat insulating portion. A method for manufacturing a battery pack, characterized in that the partition member provides a non-contact area in which it does not come into contact with the single cell.

Description

This invention relates to a battery pack. Conventionally, in battery modules including secondary batteries (hereinafter also referred to as single cells) installed in mobile objects such as vehicles and ships, various components may be placed between the single cells for various purposes. For example, Patent Document 1 discloses a secondary battery module in which buffer plates are placed between individual cells to allow for the expansion of the individual cells and to maintain the appropriate surface pressure applied to each individual cell. Furthermore, Patent Document 2 discloses a battery pack in which heat conductive members made of a resin material with a high flexural modulus are placed between individual cell cells to suppress heat transfer to adjacent individual cell cells and to efficiently dissipate heat into a heat dissipation space. Japanese Patent Publication No. 2014-157747Japanese Patent Publication No. 2011-108617Japanese Patent Publication No. 2019-175718 This is a cross-sectional view showing an example of a battery pack according to the first embodiment.This is a cross-sectional view showing an example of a battery pack according to the second embodiment.This figure shows an example of a partition member; (A) is a plan view, and (B) is a cross-sectional view taken when the material is cut along X-X shown in (A).A cross-sectional view showing an example of a battery pack according to another embodiment.This is a plan view showing an example of a partition member.This figure shows another example of a partition member, where (A) is a plan view and (B) is a cross-sectional view taken along X-X shown in (A).This figure shows another example of a partition member, where (A) is a plan view and (B) is a cross-sectional view taken along X-X shown in (A).This figure shows another example of a partition member, where (A) is a plan view and (B) is a cross-sectional view taken along X-X shown in (A).This is a plan view showing an example of a single cell.Figure 9 is a front view of a single cell.Figure 9 is a side view of a single cell.This figure plots the relationship between press pressure (restraining pressure) and thickness retention rate in the heat-insulating section of a partition member.This figure shows an example of a battery pack when a single cell expands (an example without support parts).This figure shows an example of a battery pack when a single cell expands (an example using a support). The present invention will be described below based on embodiments. However, the present invention is not limited to the embodiments described below. In this specification, when "X to Y" (where X and Y are any numbers) is written, unless otherwise specified, it includes the meaning of "greater than or equal to X and less than or equal to Y," as well as "preferably greater than X" or "preferably less than Y." Similarly, when "greater than or equal to X" (where X is any number) is written, unless otherwise specified, it includes the meaning of "preferably greater than X," and when "less than or equal to Y" (where Y is any number) is written, unless otherwise specified, it also includes the meaning of "preferably less than Y." [First Embodiment] As shown in Figure 1, the battery pack 10A according to the first embodiment is made up of a plurality of individual cells 12 and partition members 14A that separate each of the individual cells 12, stacked on top of each other. The partition members 14A are provided at least between each individual cell 12 that make up the battery pack 10A, and are members that prevent each individual cell 12 from coming into contact with each other. The partition members 14A can also be used to separate individual cells 12 from other components, in addition to separating each individual cell 12 from each other. In the example shown in Figure 1, partition members 14A are stacked between each cell 12, but it is not necessary for partition members 14A to be present between all cells; it is sufficient for at least one of the cell spaces to have a partition member. The partition member 14A has a heat insulating portion 16, and the compressive modulus of the heat insulating portion 16 in the stacking direction (Y direction) is 0.5 to 10 MPa. The partition member 14A also has a support portion 18 on the outside of the heat insulating portion 16 in the plane direction (X direction) perpendicular to the stacking direction, and has a non-contact region 20 that does not come into contact with the single cells 12. In the example shown in Figure 1, the non-contact region 20 is formed by the support portion 18 contacting and supporting each single cell 12, but the non-contact region 20 may be formed by means other than the support portion 18. Furthermore, in the present invention, it is sufficient that the non-contact region 20 is formed, and the support portion 18 or a member to replace it may not be necessary. For example, as shown in Figure 13, when assembling the single cells and the