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JP-7854837-B2 - Battery pack

JP7854837B2JP 7854837 B2JP7854837 B2JP 7854837B2JP-7854837-B2

Inventors

  • 谷内 拓哉
  • 有賀 稔之

Assignees

  • 本田技研工業株式会社

Dates

Publication Date
20260507
Application Date
20220331

Claims (10)

  1. A stack of multiple solid-state battery cells, End plates connected to both ends of the laminate in the stacking direction, The end plates at both ends are connected to first wall members via first self-aligning mechanisms, The system comprises a support member that supports the first wall member, The first self-aligning mechanism is composed of a spherical member and two plate-shaped members that can slide on the surface of the spherical member, with one plate-shaped member connected to the end plate and the other plate-shaped member connected to the first wall member . The end plate and the laminate are fixed to the first wall member in a point contact state via the first self-aligning mechanism. A battery pack characterized in that one end plate is arranged to contact one end of the solid battery cell in the stacking direction, and the other end plate is arranged to contact the other end of the solid battery cell in the stacking direction .
  2. A stack of multiple solid-state battery cells, End plates connected to both ends of the laminate in the stacking direction, The end plates at both ends are connected to first wall members via first self-aligning mechanisms, The system comprises a support member that supports the first wall member, The first self-aligning mechanism is composed of a spherical member and two plate-shaped members that can slide on the surface of the spherical member, with one plate-shaped member connected to the end plate and the other plate-shaped member connected to the first wall member. A battery pack characterized by having a protruding portion between the end plate and the first wall member, which protrudes from the end plate or the first wall member.
  3. The battery pack according to claim 2, characterized in that the protruding portion is provided on the side opposite to the support member, with the first self-aligning mechanism in between.
  4. The battery pack according to either claim 2 or 3, characterized in that the tip surface of the protrusion moves away from the rear end surface of the protrusion as it approaches the support member.
  5. The battery pack according to any one of claims 1 to 4, characterized in that the laminate and the end plate are spaced apart from the support member.
  6. A stack of multiple solid-state battery cells, Second wall members connected to both ends of the laminate in the stacking direction, End plates connected to the second wall members at both ends via a second self-aligning mechanism, The first wall member connected to the end plate, The system comprises a support member that supports the first wall member, The second self-aligning mechanism is composed of a spherical member and two plate-shaped members that can slide on the surface of the spherical member, with one plate-shaped member connected to the second wall member and the other plate-shaped member connected to the end plate . The second wall member and the laminate are fixed to the end plate in a point contact state via the second self-aligning mechanism. A battery pack characterized in that one of the second wall members is arranged to contact one end of the solid battery cell in the stacking direction, and the other of the second wall members is arranged to contact the other end of the solid battery cell in the stacking direction .
  7. A stack of multiple solid-state battery cells, Second wall members connected to both ends of the laminate in the stacking direction, End plates connected to the second wall members at both ends via a second self-aligning mechanism, The first wall member connected to the end plate, The system comprises a support member that supports the first wall member, The second self-aligning mechanism is composed of a spherical member and two plate-shaped members that can slide on the surface of the spherical member, with one plate-shaped member connected to the second wall member and the other plate-shaped member connected to the end plate. A battery pack characterized by having a protruding portion between the second wall member and the end plate, which protrudes from the second wall member or the end plate.
  8. The battery pack according to claim 7, characterized in that the protruding portion is provided on the side opposite to the support member, with the second self-aligning mechanism in between.
  9. The battery pack according to either claim 7 or 8, characterized in that the tip surface of the protrusion moves away from the rear end surface of the protrusion as it approaches the support member.
  10. The battery pack according to any one of claims 6 to 9, characterized in that the laminate and the second wall member are spaced apart from the support member.

Description

This invention relates to a battery pack. In recent years, research and development has been conducted on rechargeable batteries that contribute to energy efficiency, aiming to ensure that more people have access to affordable, reliable, sustainable, and advanced energy. Vehicles developed in recent years are equipped with battery packs, where battery modules, which are typically components of electronic devices, are mounted together. Battery packs equipped with secondary battery cells face the following challenges: In battery packs mounted on vehicles, vibrations from the vehicle can easily cause the battery module to bend or twist due to pressure, potentially damaging the secondary battery cells that make up the battery module. Patent Document 1 discloses a technique for suppressing deflection in a stack of secondary battery cells constituting a battery module (battery stack), even when it is under pressure in the stacking direction. This technique is achieved by providing a slope on the surface of the claw members that press against both ends of the stack, thereby absorbing the expansion of the pack side of the stack. Japanese Patent Publication No. 2021-096989 (a) A plan view of a battery pack according to the first embodiment of the present invention. (b) An enlarged view of the battery pack of (a) near the self-aligning mechanism.This is a cross-sectional view of the battery module in the same embodiment.This is a cross-sectional view of a battery pack according to a second embodiment of the present invention.This is a plan view of a battery pack according to a third embodiment of the present invention.This is a cross-sectional view of the battery pack in the same embodiment.This is a cross-sectional view of a battery pack according to Modification 1 of the same embodiment.This is a cross-sectional view of a battery pack according to a modified example 2 of the same embodiment.This is a cross-sectional view of a battery pack according to a modified example 3 of the same embodiment.(a) A cross-sectional view of a battery pack according to the fourth embodiment of the present invention. (b) An enlarged view of the battery pack of (a) near the protruding portion. The following describes in detail, with reference to the drawings, a battery pack according to an embodiment of the present invention. Note that, for the sake of clarity, the drawings used in the following description may show enlarged versions of key features, and the dimensional ratios of each component may not be the same as those in reality. Furthermore, the materials, dimensions, etc., exemplified in the following description are merely examples, and the present invention is not limited to these; it can be implemented with appropriate modifications without altering its essence. <First Embodiment> Figure 1(a) is a plan view of a battery pack 100 according to a first embodiment of the present invention. The battery pack 100 mainly comprises a stack 101 of a plurality of solid battery cells, a pair of end plates 102, a pair of self-aligning mechanisms 103, a pair of first wall members 104, a connecting member 105, and a support member 106. Figure 1(b) is an enlarged view of the battery pack 100 of Figure 1(a), showing the area near the first self-aligning mechanism 103. The multiple solid-state battery cells (not shown) constituting the laminate 101 are assumed to be stacked in the Y direction. Each stacked solid-state battery cell comprises a positive electrode current collector, a positive electrode active material, a solid electrolyte, a negative electrode active material, and a negative electrode current collector, and these are stacked in the Y direction, either directly or with other components in between. One of a pair of end plates 102 is connected to each end of the laminate 101 in the stacking direction L. One first end plate 102A is positioned to contact one end L1 of the solid battery cell 101 in the stacking direction L, and the other second end plate 102B is positioned to contact the other end L2 in the same stacking direction. The restraining means (not shown) presses the multiple solid-state battery cells 101 in the stacking direction L from both ends L1 and L2 via the first end plate 102A and the second end plate 102B, thereby restraining the all-solid-state battery cells 101. The restraining means may be, for example, a band-shaped object (such as a restraining hoop) that surrounds the stacked all-solid-state battery cells 101, but other forms may also be used. At each end of the laminate 101, the end plates 102 (102A, 102B) are connected to the first wall members 104 (104A, 104B) on the side opposite to the laminate 101, via a self-aligning mechanism 103 (first self-aligning mechanism 103A). Specifically, end plate 102A is connected to first wall member 104A via the first self-aligning mechanism 103A, and end plate 102B is connected to first wall member 104B via the first self-aligning mechanism 103A. First wall members 104A