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CN-121983720-A - Battery case and battery

CN121983720ACN 121983720 ACN121983720 ACN 121983720ACN-121983720-A

Abstract

The application relates to a battery shell and a battery, wherein the shell comprises a shell side part and a shell bottom, the shell side part and the shell bottom are enclosed to form an installation space for accommodating a battery cell, a connecting part is positioned at the joint of the shell side part and the shell bottom, one side of the connecting part, which faces the installation space, is provided with an accommodating cavity, the accommodating cavity is communicated with the installation space, and the accommodating cavity is positioned at one side of the battery cell, which faces the gravity direction. The connecting part is a transition area between the lower edge of the side part of the shell and the edge of the bottom of the shell, and is used for replacing the traditional inner chamfering structure. The traditional aluminum shell connecting part structure is easy to be in hard contact with the edge of the bottom surface of the battery cell, the accommodating cavity is communicated with the installation space, and the accommodating cavity is recessed towards the gravity direction, so that the surface of the connecting part towards the installation space is free of protrusions. When the battery cell is installed, gaps are reserved between the edge of the bottom surface of the battery cell and the side part and the bottom part of the shell, that is, the edge of the bottom surface of the battery cell is not in direct contact with the side part and the bottom part of the shell, and the concave structure of the accommodating cavity provides a special avoidance space for the edge of the bottom surface of the battery cell.

Inventors

  • WU XIANGYUN
  • ZHANG XIAOYUN

Assignees

  • 跃动新能源科技(浙江)有限公司

Dates

Publication Date
20260505
Application Date
20260107

Claims (10)

  1. 1. A battery case, comprising: A housing (100) comprising a housing side (110), a housing bottom (120) and a connection (130); The shell side part (110) is connected with the shell bottom part (120) and is enclosed into an installation space for accommodating the battery cell; The connecting part (130) is connected to the connecting part of the shell side part (110) and the shell bottom part (120), a containing cavity (140) is formed in one side of the connecting part (130) facing the installation space, the containing cavity (140) is communicated with the installation space, and the containing cavity (140) is located on one side of the battery cell facing the gravity direction.
  2. 2. The battery housing according to claim 1, characterized in that at least part of the inner wall of the receiving chamber (140) is connected with the inner wall of the housing side (110); And/or at least part of the inner wall of the receiving chamber (140) is connected to the inner wall of the housing bottom (120).
  3. 3. The battery case according to claim 1 or 2, wherein a communication groove (121) is formed in an inner wall of the case bottom (120) facing the side of the battery cell, and at least a part of the communication groove (121) is communicated with the accommodating chamber (140); The communication groove (121) is used for communicating the electrolyte.
  4. 4. The battery housing according to claim 1 or 2, characterized in that a boss (122) is provided on an inner wall of the housing bottom (120) facing the side of the battery cell, the boss (122) being for supporting the battery cell; The boss (122) is provided with a through slot (123), and the slot (123) is used for supplying electrolyte.
  5. 5. The battery case according to claim 1 or 2, wherein a plurality of supporting seats (124) are provided at intervals on an inner wall of the case bottom (120) facing the side of the battery cell, and the plurality of supporting seats (124) are each used for supporting the battery cell.
  6. 6. The battery housing according to claim 5, wherein the height of the support base (124) is 0.2mm-0.5mm.
  7. 7. Battery housing according to claim 1 or 2, characterized in that the housing (100) is integrally stamped and formed of an aluminum alloy.
  8. 8. The battery housing according to claim 1 or 2, characterized in that the depth of the receiving cavity (140) is 0.5mm-0.8mm; And/or the width of the accommodating cavity (140) is 1mm-1.5mm.
  9. 9. The battery case according to claim 1 or 2, wherein a plurality of reinforcing ribs are provided on an inner wall of the accommodation chamber (140) at intervals, the reinforcing ribs being integrally formed with the housing (100); The reinforcing ribs are used for improving the strength of the connecting part (130).
  10. 10. A battery comprising a battery casing according to any one of the preceding claims 1-9.

Description

Battery case and battery Technical Field The application relates to the technical field of lithium ion batteries, in particular to a battery shell and a battery. Background In the manufacture of lithium batteries, the packaging of lithium batteries often employs a cover plate and an aluminum case to protect the battery. The aluminum shell is used as a main body shell of the battery, provides a rigid accommodating space for the battery core, and resists mechanical damage such as external impact, extrusion, puncture and the like. The cover plate is used as a top sealing piece of the aluminum shell to seal the battery cavity, and meanwhile provides a mounting foundation for functional components such as the pole column and the explosion-proof valve, the pole column and the explosion-proof valve are matched to form a complete sealed cavity, the positions of internal components such as the battery cell and the electrolyte are fixed, and the short circuit of the anode and the cathode caused by the displacement of the battery cell is avoided. The lithium battery needs to be strictly isolated from air, especially moisture and oxygen, otherwise, electrolyte is hydrolyzed, the core material is oxidized, and capacity fading and even safety accidents are caused. The aluminum shell is made of metal, and is matched with the sealing ring, so that the invasion of external environment media can be effectively prevented, and meanwhile, the leakage of internal electrolyte is prevented. However, when the existing aluminum shell is used, because the inner chamfer exists at the bottom of the aluminum shell, the inner chamfer can touch the bottom edge of the battery cell to cause interference when the battery cell is installed, so that the battery cell is damaged, and the use cost in the manufacturing process of the battery cell can be increased by using the bottom bracket. Disclosure of Invention The application provides a battery shell and a battery, which can eliminate interference between the edge of the bottom surface of a battery cell and an aluminum shell when the battery cell is installed, so as to avoid damage to the battery cell. According to one aspect of the application, there is provided a battery case comprising a case body including a case side part, a case bottom part and a connecting part, the case side part and the case bottom part being connected and enclosing an installation space for accommodating a battery cell; The connecting part is connected to the connecting part of the shell side part and the shell bottom; the connecting portion is towards one side of installation space has seted up and has held the chamber, hold the chamber with installation space intercommunication, hold the chamber and be located electric core orientation gravity direction one side. In one embodiment, at least part of the inner wall of the receiving cavity is connected to the inner wall of the side portion of the case, and at least part of the inner wall of the receiving cavity is connected to the inner wall of the bottom portion of the case. In one embodiment, a communication groove is formed in the inner wall of the bottom of the shell, facing one side of the battery cell, at least part of the communication groove is communicated with the accommodating cavity, and the communication groove is used for communicating electrolyte. In one embodiment, a boss is arranged on the inner wall of the bottom of the shell facing one side of the battery cell and used for supporting the battery cell, and a through slot is formed in the boss and used for supplying power supply liquid. In one embodiment, a plurality of supporting seats are arranged on the inner wall of the bottom of the shell facing one side of the battery cell at intervals, and the plurality of supporting seats are all used for supporting the battery cell. In one embodiment, the height of the boss and the plurality of support seats is 0.2mm-0.5mm. In one embodiment, the housing is integrally stamped and formed of an aluminum alloy. In one embodiment, the depth of the accommodating cavity is 0.5mm-0.8mm, and the width of the accommodating cavity is 1mm-1.5mm. In one embodiment, a plurality of reinforcing ribs are arranged on the inner wall of the accommodating cavity at intervals, the reinforcing ribs are integrally formed with the shell, and the reinforcing ribs are used for improving the strength of the connecting portion. The application has the following beneficial effects: The shell comprises a shell side part, a shell bottom and a connecting part, wherein the connecting part is a transition area between the lower edge of the shell side part and the edge of the shell bottom and is used for replacing a traditional inner chamfering structure. While the traditional aluminum shell connecting part structure is easy to be in hard contact with the edge of the bottom surface of the battery cell, the accommodating cavity is communicated with the installation space, and the accommodating