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CN-224217675-U - Secondary battery and battery pack

CN224217675UCN 224217675 UCN224217675 UCN 224217675UCN-224217675-U

Abstract

The embodiment of the application discloses a secondary battery and a battery pack, wherein a top cover piece in a top cover assembly is bent at two ends of the top cover piece in a first direction to form a bent part, so that the two ends of the top cover piece in the first direction extend to the outer sides of the two ends of an electrode assembly in the first direction respectively, and a pole in the top cover assembly is arranged on the bent part, so that the pole can be connected with an adjacent pole lug without a pin, the space occupied by the pin which is required by the top cover in the prior art is saved, the energy density of the secondary battery is improved, the risk of breakage failure caused by vibration of the pin is solved, and the service life of the secondary battery is prolonged.

Inventors

  • YANG YUJIE
  • CHEN DONG
  • HE XUAN
  • XU LUN
  • GAO YUXIN
  • WANG BAOYU
  • ZHANG YAO
  • CHEN HUI

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250523

Claims (10)

  1. 1. A secondary battery, characterized by comprising: The shell is provided with a first direction and a second direction which are perpendicular to each other, one end of the shell along the second direction is provided with a first opening, and two ends along the first direction are provided with second openings; Electrode assemblies arranged in the shell, wherein two ends of each electrode assembly in the first direction are respectively provided with a tab; the top cover assembly comprises a top cover sheet and a pole, wherein the top cover sheet comprises a main body part and a bending part, the main body part extends along the first direction, the bending parts are arranged at two ends of the main body part in the first direction, and the pole is arranged on the bending part; the top cover sheet covers the first opening, the bending part covers the second opening, and the pole is connected with the pole lug.
  2. 2. The secondary battery according to claim 1, wherein the case includes two first side walls disposed opposite to each other in the first direction, the first side walls being open at one end thereof adjacent to the first opening in the second direction with the second opening extending in the second direction and communicating with the first opening; the bending part is embedded in the second opening, and one end, away from the main body part, of the bending part abuts against the inner bottom wall of the second opening in the second direction.
  3. 3. The secondary battery according to claim 1, wherein the case further has a third direction perpendicular to the first direction and the second direction, respectively, and further comprises a bottom wall and two second side walls disposed opposite to each other along the third direction, the bottom wall being disposed opposite to the first opening in the second direction, the second opening extending to the bottom wall along the second direction, and an end of the bent portion remote from the main body portion in the second direction being abutted against the bottom wall.
  4. 4. The secondary battery according to claim 3, wherein the second side wall is provided with a first groove on an end face near one end of the second opening in the first direction, the first groove extending in the second direction; the bending part is embedded in the first groove; In the first direction, the depth of the first groove is L 1 mm, and the thickness of the bending part is S 1 mm,S 1 ≤L 1 .
  5. 5. The secondary battery according to claim 4, wherein the second side wall is provided with a second groove on an end face near the first opening end in the second direction, the second groove extending in the first direction; the second groove and the first groove are communicated with each other, and the main body part is embedded in the second groove; in the second direction, the depth of the second groove is L 2 mm, and the thickness of the main body portion is S 2 mm,S 2 ≤L 2 .
  6. 6. The secondary battery according to claim 4, wherein the bottom wall is provided with a third groove on an end face near one end of the second opening in the first direction; The third groove and the first groove are communicated with each other; one end of the bending part, which is away from the main body part in the second direction, is embedded in the third groove; In the first direction, the depth of the third groove is L 3 mm, and the thickness of the bending part is S 1 mm,S 1 ≤L 3 .
  7. 7. The secondary battery according to claim 1, wherein a length of the bent portion in the second direction is H 1 mm; In the second direction, the minimum distance between the pole and the end face of the bending part, which is close to one end of the main body part, is H 2 mm, and 1/5H 1 ≤H 2 ＜1/2H 1 is satisfied.
  8. 8. The secondary battery according to claim 1, wherein the bent portion and the main body portion are integrally formed.
  9. 9. The secondary battery of claim 1, wherein the housing has a dimension L 4 mm in the first direction, a dimension L 5 mm in the second direction, and a dimension L 6 mm in the third direction, satisfying L 4 ＞L 5 ＞L 6 .
  10. 10. A battery pack comprising the secondary battery according to any one of claims 1 to 9.

Description

Secondary battery and battery pack Technical Field The application relates to the technical field of batteries, in particular to a secondary battery and a battery pack. Background With the development of science and technology, secondary batteries are widely used in portable electronic devices such as mobile phones, digital cameras and portable computers, and have wide application prospects in the aspects of electric vehicles such as electric automobiles and electric bicycles, and large and medium-sized electric devices such as energy storage facilities, and become an important technical means for solving global problems such as energy crisis and environmental pollution. The prior secondary battery has two tab leading-out modes, namely a same-side tab and a different-side tab, wherein the different-side tab, namely a positive tab and a negative tab, is respectively arranged at the opposite ends of the electrode assembly in the first direction, and most of the secondary battery adopts the structural design of an upper top cover for the different-side tab so as to reduce the difficulty of the electrode assembly in a shell, namely the two ends of the top cover assembly are provided with pins, the two pins are respectively connected with the tabs at the adjacent sides, and the pins have the risk of vibration fracture in the use process of the battery. Disclosure of utility model The embodiment of the application provides a secondary battery and a battery pack, which can solve the problems that the utilization rate of the internal space of a shell is low and the breakage risk of pins exists due to the fact that a top cover is arranged on the existing secondary battery. The first aspect of the embodiment of the application provides a secondary battery, which comprises a shell, an electrode assembly, a top cover assembly and a top post, wherein the shell is provided with a first direction and a second direction which are perpendicular to each other, one end of the shell along the second direction is provided with a first opening, two ends of the shell along the first direction are provided with second openings, the electrode assembly is arranged in the shell, two ends of the electrode assembly along the first direction are respectively provided with a pole lug, the top cover assembly comprises a top cover plate and a pole post, the top cover plate comprises a main body part and a bending part, the main body part extends along the first direction, two ends of the main body part along the first direction are respectively provided with the bending part, the bending part is provided with the pole post, the top cover plate is covered on the first opening, the bending part is covered on the second opening, and the pole post is connected with the pole lug. Optionally, the shell comprises two first side walls which are oppositely arranged along the first direction, the first side walls are provided with second openings at one ends which are close to the first openings in the second direction, the second openings extend along the second direction and are communicated with the first openings, the bending parts are embedded in the second openings, and one ends, away from the main body, of the bending parts are propped against the inner bottom walls of the second openings in the second direction. Optionally, the shell further comprises a bottom wall and two second side walls arranged oppositely along the third direction, the bottom wall and the first opening are arranged oppositely along the second direction, the second opening extends to the bottom wall along the second direction, and in the second direction, one end of the bending part far away from the main body part abuts against the bottom wall. Optionally, a first groove is formed in an end face, close to one end of the second opening, of the second side wall in the first direction, the first groove extends along the second direction, the bending portion is embedded in the first groove, the depth of the first groove in the first direction is L 1 mm, and the thickness of the bending portion is S 1 mm,S1≤L1. Optionally, a second groove is formed in an end face, close to one end of the first opening, of the second side wall in the second direction, the second groove extends along the first direction, the second groove and the first groove are communicated with each other, the main body portion is embedded in the second groove, the depth of the second groove in the second direction is L 2 mm, and the thickness of the main body portion is S 2 mm,S2≤L2. Optionally, a third groove is formed in the end face, close to one end of the second opening, of the bottom wall in the first direction, the third groove and the first groove are communicated with each other, one end, away from the main body portion, of the bending portion in the second direction is embedded in the third groove, the depth of the third groove in the first direction is L 3 mm, and the thickness of the bending po