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CN-121986407-A - Battery pack

CN121986407ACN 121986407 ACN121986407 ACN 121986407ACN-121986407-A

Abstract

The battery pack (100) is provided with an elastic body (20) provided on a part of each inner surface (12 a) of the pair of cover parts (12). A pair of cover parts (12) are respectively fixed to the end faces of the battery block (2) accommodated in the accommodating space of the housing body (11). A Gap (GP) is formed between the pair of cover parts (12) and the end edges (11 a) of the respective opening ends of the housing main body (11). The lid section (12) includes a flat lid body (13) and a wall section (14) protruding from the inner surface of the lid body (13). The elastic body (20) is disposed so as to be in contact with the surface of the wall (14) facing the inner surface of the case body (44), and has an inclined surface (21) that widens toward the inner surface of the cover (12), a part of the inclined surface (21) enters the Gap (GP), and a corner (19) between the edge (11 a) of the opening end of the case body (11) and the inner surface (11 b) of the case body (44) is in contact with the inclined surface (21).

Inventors

  • Kanyu Taro

Assignees

  • 松下知识产权经营株式会社

Dates

Publication Date
20260505
Application Date
20240930
Priority Date
20231011

Claims (8)

  1. 1. A battery pack is provided with: A battery block holding a plurality of secondary battery cells; An exterior case having a case body with a1 st end face and a2 nd end face respectively opened, having a1 st opening end and a2 nd opening end, having an accommodation space, a1 st cover part covering the 1 st opening end of the case body, and a2 nd cover part covering the 2 nd opening end of the case body, and A1 st elastic body arranged on the inner surface of the 1 st cover part, The battery block is received in the receiving space of the housing body, The 1 st cover part is fixed on the 1 st end face of the battery block, The 2 nd cover part is fixed on the 2 nd end surface of the battery block, A1 st gap is formed between the 1 st cover part and the housing main body, The 1 st cover part includes: a flat plate-like 1 st lid main body, and A1 st wall portion protruding from an inner surface of the 1 st lid main body, The 1 st elastic body is configured to be abutted with the surface of the 1 st wall part opposite to the inner surface of the shell main body, The 1 st elastic body has a1 st inclined surface widening toward the inner surface of the 1 st cover part, A part of the 1 st inclined surface enters the 1 st gap, And a 1 st corner of the housing body located between an edge of the 1 st opening end of the housing body and the inner surface of the housing body is abutted against the 1 st inclined surface.
  2. 2. The battery pack of claim 1, wherein, The 1 st elastic body extends so as to widen the 1 st inclined surface at an end thereof in a region where the 1 st cover portion overlaps the end edge of the 1 st opening end of the housing main body, as viewed from the cover portion.
  3. 3. The battery pack of claim 1, wherein, The 1 st elastic body further includes a flange portion protruding toward the inner surface of the case body.
  4. 4. The battery pack of claim 1, wherein, The 1 st lid body has a recess between the 1 st wall portion and a peripheral edge of the 1 st lid body, The 1 st elastic body has a convex portion inserted into the concave portion of the 1 st lid main body.
  5. 5. The battery pack according to any one of claims 1 to 4, wherein, The 1 st elastic body is integrally formed with the 1 st wall portion by two-color molding.
  6. 6. The battery pack according to any one of claims 1 to 4, wherein, The 1 st corner of the 1 st open end of the housing body is chamfered.
  7. 7. The battery pack according to any one of claims 1 to 4, wherein, The 1 st cover part is fixed with the 1 st end face of the battery block through screwing, The 2 nd cover part is fixed with the 2 nd end face of the battery block through screwing.
  8. 8. The battery pack according to any one of claims 1 to 4, wherein, The battery pack further comprises a 2 nd elastic body arranged on the inner surface of the 2 nd cover part, A2 nd gap is formed between the 2 nd cover part and the housing main body, The 2 nd lid portion includes: A flat plate-shaped 2 nd cover main body, and A 2 nd wall portion protruding from an inner surface of the 2 nd cap body, The 2 nd elastic body is configured to be abutted with the surface of the 2 nd wall part opposite to the inner surface of the shell main body, The 2 nd elastic body has a 2 nd inclined surface widening toward the inner surface of the 2 nd cover part, A portion of the 2 nd inclined surface enters the 2 nd gap, And a2 nd corner of the housing body between an end edge of the 2 nd opening end of the housing body and an inner surface of the housing body is abutted against the 2 nd inclined surface.

Description

Battery pack Technical Field The present disclosure relates to a battery pack. Background A plurality of rechargeable secondary battery cells such as lithium ion secondary batteries are connected in series or parallel, and are accommodated in an outer case, thereby driving a device to be driven (for example, patent document 1). For example, an exterior case 1110 as shown in the exploded perspective view of fig. 11 is used as such a battery pack. The outer case shown in this figure is composed of a tubular case body 1111 having both end surfaces open and having an inner space as a storage space, and a pair of cover portions 1112 each closing each end surface. In addition, a battery block 1102 that holds a plurality of secondary battery cells is inserted into the accommodation space of the case body 1111. In a state where the battery block 1102 is inserted from the end face of the case body 1111, the end faces are closed by the cover 1112. The cover portions 1112 are screwed into end face screw holes 1108 that are opened in the end face of the housing body 1111 by end face screws 1140. On the other hand, a bottom surface screw hole for fixing the battery block in the storage space may be provided in the bottom surface of the case body. In a state in which the battery block 1102 is inserted into the accommodation space of the housing body 1111, the battery block 1102 is screwed by a bottom screw 1143 fastened to the bottom screw hole 1109 of the housing body 1111. In the assembled battery 1100 having this structure, the battery block 1102 inside the case body 1111 is directly screwed to the case body 1111, so that the battery block 1102 can be stably fixed to the outer case 1110. However, depending on the specifications of the battery pack, such a structure may not be adopted. For example, if it is desired to form the end face screw hole in the housing body, it is necessary to form the housing body thicker. When the case body is made of metal for strength, the thickness is increased, which increases the cost. On the other hand, in order to screw the bottom surface of the battery block and the like to the case main body, it is necessary to open the bottom surface screw hole in the bottom surface of the case main body and the like, but with such a configuration, it is difficult to waterproof the exterior case. Therefore, the case body and the battery block may not be directly screwed together. Therefore, it is conceivable that the lid is directly fixed to the battery block without opening the end face screw hole and the bottom face screw hole in the case body. As an example of this, as shown in the exploded perspective view of fig. 12, a structure is considered in which block screw holes 1207 are opened in the respective end faces of a battery block 1202 inserted into a case main body 1211 of an outer case 1210, and a cover 1212 is screwed with an end face screw 1240. In this structure, the end surfaces of the case main body 1211 and the cover 1212 are not directly fixed. In addition, due to manufacturing tolerances of the case body 1211 and the battery block 1202, a gap is generated at the joint interface between the case body 1211 and the lid 1212 as shown in the cross-sectional view of fig. 13. As a result, as shown by the arrow in fig. 13, the position of the case main body 1211 is shifted by the amount of the gap between the case main body 1211 and the cover 1212, which may prevent positioning when the battery pack is mounted at the fixed position of the driving target device, and the mountability may be lowered. As shown in fig. 14, the case main body 1211 moves by the amount of the gap with the cover 1212. Therefore, when the battery pack is used in an environment where the battery pack is exposed to vibration or when stress is applied from the outside by dropping the battery pack, contact may occur at the joint interface between the case main body 1211 and the cover 1212, and the battery pack may be damaged. Depending on the use, specification, and the like of the battery pack, it is required to satisfy a drop test, a vibration test, and the like as a reliability test and a durability test. In particular, when the case body is made of metal for improving the rigidity of the exterior case and the cover is made of resin for improving the insulation of the connector provided in the cover, the case body made of metal and the cover made of resin may have different hardness, and thus breakage cracks may occur on the cover side. Prior art literature Patent literature Patent document 1 Japanese patent No. 6049288 Disclosure of Invention The present disclosure provides a battery pack in which an exterior case, a lid, and a battery block can be stably fixed. Another object is to provide a battery pack that absorbs component tolerances and has improved reliability against external forces. The description of these objects and problems of the present disclosure does not hinder the existence of other objects and probl