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CN-224217658-U - Battery and battery pack

CN224217658UCN 224217658 UCN224217658 UCN 224217658UCN-224217658-U

Abstract

The application relates to the technical field of batteries and discloses a battery and a battery pack, wherein the battery comprises a shell, a winding core and an explosion-proof valve, the winding core is provided with an arc-shaped end face along a first direction, the winding core is positioned in the shell, the winding cores are multiple in number, the winding cores are distributed along a second direction, the arc-shaped end faces of the winding cores are distributed along the second direction, an exhaust channel is formed between the arc-shaped end faces distributed along the second direction and the inner wall face of the shell, which is close to one end of the arc-shaped end face, of the shell, the explosion-proof valve is connected to one end of the shell, which is close to the arc-shaped end face, and one surface of the explosion-proof valve, which faces the winding cores, forms at least part of the inner wall face of the exhaust channel.

Inventors

  • MU XUEMENG
  • YU CONG
  • LIANG CHANGQING
  • WU YONG
  • SUN ZHENYU
  • XU ZHONGLING

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250422

Claims (10)

  1. 1. A battery having a first direction (X) and a second direction (Y) intersecting, characterized in that the battery comprises a housing (1), a winding core (2) and an explosion-proof valve (3); -along said first direction (X), said winding core (2) having an arcuate end face (201), said winding core (2) being located inside said housing (1); Wherein, arc terminal surface (201) with casing (1) is in be close to in the first direction (X) form exhaust passage (100) between the internal face of the one end of arc terminal surface (201), explosion-proof valve (3) connect in casing (1) be close to in first direction (X) one end of arc terminal surface (201), just explosion-proof valve (3) orientation the one side of rolling up core (2) constitutes at least part of exhaust passage (100) internal face.
  2. 2. The battery according to claim 1, characterized in that it further has a third direction (Z), said first direction (X), said second direction (Y) and said third direction (Z) intersecting in pairs; The shell body (1) comprises a shell body (11) and a top cover assembly (12), the shell body (11) and the top cover assembly (12) are connected along the third direction (Z), the shell body (11) comprises a first side wall (111), the first side wall (111) and the top cover assembly (12) are oppositely arranged along the third direction (Z), the winding core (2) is located in the shell body (11), and the explosion-proof valve (3) is connected to the first side wall (111).
  3. 3. The battery according to claim 2, wherein the first side wall (111) has a mounting through hole (1101) provided therethrough in the third direction, the explosion-proof valve (3) covering the mounting through hole (1101); The battery further comprises a reinforcement (4), wherein the reinforcement (4) is provided with an exhaust hole (401) penetrating along the third direction (Z), and the reinforcement (4) is connected to the hole wall surface of the mounting through hole (1101); the explosion-proof valve (3) and the reinforcement (4) are arranged along the third direction (Z).
  4. 4. A battery according to claim 3, wherein the mounting through hole (1101) includes a first hole portion (1101A) and a second hole portion (1101B) communicating in a third direction (Z), the first hole portion (1101A) having a larger pore diameter than the second hole portion (1101B); the reinforcement (4) comprises a first ring body (41) and a second ring body (42), the first ring body (41) and the second ring body (42) are connected along the third direction (Z), the outer diameter of the first ring body (41) is larger than that of the second ring body (42), and inner holes of the first ring body (41) and the second ring body (42) are mutually communicated to form the exhaust hole (401); wherein the outer peripheral surface of the first ring body (41) is connected to the hole wall surface of the first hole (1101A), and the outer peripheral surface of the second ring body (42) is connected to the hole wall surface of the second hole (1101B).
  5. 5. The battery according to claim 4, characterized in that the first hole portion (1101A) is located at a side of the second hole portion (1101B) close to the winding core (2); Or alternatively, the first and second heat exchangers may be, The first hole portion (1101A) is located on a side of the second hole portion (1101B) away from the winding core (2).
  6. 6. The battery according to claim 5, wherein the explosion-proof valve (3) is attached to a wall surface of the second hole portion (1101B), and the explosion-proof valve (3) is in contact with the second ring body (42).
  7. 7. The battery according to claim 3 or 6, characterized in that the explosion-proof valve (3) comprises a valve body (31) and an explosion-proof score (32), the valve body (31) being in the form of a sheet, the valve body (31) being connected to the case body (11) and covering the mounting through hole (1101), the explosion-proof score (32) being provided on a side of the valve body (31) in the third direction (Z); Wherein, the The anti-explosion nicks (32) are arc-shaped, the number of the anti-explosion nicks (32) is multiple, the anti-explosion nicks (32) are arranged around the center of the valve main body (31), and the arc-shaped openings of the anti-explosion nicks (32) are opposite to the center of the valve main body (31); Or alternatively, the first and second heat exchangers may be, The explosion-proof nick (32) is annular, and the explosion-proof nick (32) is arranged around the center of the valve main body (31); Or alternatively, the first and second heat exchangers may be, The anti-explosion nicks (32) are in a straight line, the number of the anti-explosion nicks (32) is multiple, and the anti-explosion nicks (32) are arranged in an intersecting mode.
  8. 8. A battery according to claim 3, characterized in that the mounting through hole (1101) has an oval shape, the long axis of the mounting through hole (1101) extending in the second direction (Y); Or alternatively, the first and second heat exchangers may be, The mounting through hole (1101) is arched, a string section of the mounting through hole (1101) extends along the second direction (Y), and in the first direction (X), the string section of the mounting through hole (1101) is positioned at one side of the arc section away from the center of the first side wall (111); Or alternatively, the first and second heat exchangers may be, The mounting through hole (1101) is trapezoid, the lower bottom of the mounting through hole (1101) extends along the second direction (Y), and in the first direction (X), the lower bottom of the mounting through hole (1101) is located at one side, far away from the center of the first side wall (111), of the upper bottom.
  9. 9. The battery according to claim 2, characterized in that, in the first direction (X), both ends of the winding core (2) have the arc-shaped end faces (201), and both ends of the first side wall (111) are provided with the explosion-proof valve (3).
  10. 10. A battery pack comprising a housing and a battery as claimed in any one of claims 1 to 9, said battery being connected within said housing.

Description

Battery and battery pack Technical Field The application relates to the technical field of batteries, in particular to a battery and a battery pack. Background During the charge and discharge of the battery, particularly in abnormal conditions such as overcharge, internal short circuit, etc., severe electrochemical reactions occur inside the battery, and a large amount of heat is generated. These heat causes decomposition of the electrolyte, electrode material, etc. inside the battery, and a large amount of gas is generated, resulting in a rapid increase in the internal pressure of the battery. The explosion-proof valve can be automatically opened when the pressure reaches a preset value, high-pressure gas in the battery is timely released, explosion or rupture of the battery due to overhigh internal pressure is avoided, the safety of a shell and peripheral equipment of the battery is effectively protected, and in a conventional battery, the explosion-proof valve is positioned in the middle of the battery, the explosion-proof valve is tightly attached to a winding core, the pressure release process of the battery is blocked, and the pressure release effect is poor. Disclosure of utility model The application aims at providing a battery with good pressure relief effect. In order to achieve the above object, the present application provides a battery having intersecting first and second directions, the battery including a case, a winding core, and an explosion-proof valve; The winding core is provided with an arc-shaped end face along the first direction, and the winding core is positioned in the shell; The anti-explosion valve is connected to one end of the shell, which is close to the arc end face in the first direction, and one surface of the anti-explosion valve, which faces the winding core, forms at least part of the inner wall surface of the exhaust passage. In a specific embodiment of the present application, the battery further has a third direction, and the first direction, the second direction, and the third direction intersect two by two; The casing includes shell main part and top cap subassembly, the shell main part with the top cap subassembly is followed the third direction is connected, the shell main part includes first lateral wall, first lateral wall with the top cap subassembly is followed the third direction sets up relatively, it is located to roll up the core in the shell main part, explosion-proof valve connect in on the first lateral wall. In a specific embodiment of the present application, the first side wall has a mounting through hole penetrating along the third direction, and the explosion-proof valve covers the mounting through hole; The battery further comprises a reinforcement member having an exhaust hole penetrating along the third direction, the reinforcement member being connected to the wall surface of the mounting through hole; The explosion-proof valve and the reinforcement are arranged along the third direction. In a specific embodiment of the present application, the mounting through hole includes a first hole portion and a second hole portion communicating in a third direction, the first hole portion having a larger aperture than the second hole portion; The reinforcement comprises a first ring body and a second ring body, the first ring body and the second ring body are connected along the third direction, the outer diameter of the first ring body is larger than that of the second ring body, and inner holes of the first ring body and the second ring body are mutually communicated to form the exhaust hole; The outer circumferential surface of the first ring body is connected with the hole wall surface of the first hole part, and the outer circumferential surface of the second ring body is connected with the hole wall surface of the second hole part. In a specific embodiment of the present application, the first hole is located at a side of the second hole near the winding core; Or alternatively, the first and second heat exchangers may be, The first hole part is positioned at one side of the second hole part far away from the winding core. In a specific embodiment of the present application, the explosion-proof valve is connected to a hole wall surface of the second hole portion, and the explosion-proof valve is in contact with the second ring body. In a specific embodiment of the present application, the explosion-proof valve includes a valve body and an explosion-proof score, the valve body is in a sheet shape, the valve body is connected to the housing body and covers the mounting through hole, and the explosion-proof score is provided on a side surface of the valve body in the third direction; Wherein, the The anti-explosion nicks are arc-shaped, the number of the anti-explosion nicks is multiple, the anti-explosion nicks are arranged around the center of the valve main body, and the arc-shaped openings of the anti-explosion nicks face away from the center of th