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CN-224217670-U - Battery cell and battery pack

CN224217670UCN 224217670 UCN224217670 UCN 224217670UCN-224217670-U

Abstract

The application discloses a battery monomer and a battery pack, and relates to the technical field of power batteries, wherein the battery monomer comprises a shell, a top cover assembly, an electrode assembly and a connecting sheet; the shell is provided with an accommodating cavity, the top cover assembly comprises a top cover and a pole column arranged on the top cover, the top cover is connected with the shell and covers the accommodating cavity, the top cover is provided with a liquid injection hole, the liquid injection hole is arranged at intervals with the pole column, the electrode assembly is arranged in the accommodating cavity, one side of the electrode assembly, facing the top cover, is provided with a pole lug, the connecting piece is arranged in the accommodating cavity, the connecting piece is provided with a connecting welding part and a connecting part, one end of the welding part, facing the connecting part, is provided with an avoidance opening, at least part of the connecting part is connected with the edge of the welding part, which is positioned at the avoidance opening, the welding part is welded with the pole column or the pole lug, and the avoidance opening is arranged opposite to the liquid injection hole. The battery unit can reduce the probability of deformation of the connecting sheet after welding.

Inventors

  • WANG SHUNSHUN
  • SUN TIECHENG
  • HU CHUNBO
  • YANG WEI

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250515

Claims (10)

  1. 1. A battery cell, characterized by comprising a case (100), a top cap assembly (200), an electrode assembly (300), and a connection sheet (400); the housing (100) has a receiving cavity; The top cover assembly (200) comprises a top cover (210) and a pole (220) arranged on the top cover (210), wherein the top cover (210) is connected with the shell (100) and covers the accommodating cavity, the top cover (210) is provided with a liquid injection hole (211), and the liquid injection hole (211) and the pole (220) are arranged at intervals; The electrode assembly (300) is positioned in the accommodating cavity, and a lug (310) is arranged on one side of the electrode assembly (300) facing the top cover (210); the connecting piece (400) is located hold the chamber, connecting piece (400) are equipped with and are connected welding portion (410) and connecting portion (420), welding portion (410) orientation connecting portion (420)'s one end is equipped with dodges opening (411), connecting portion (420) at least part with welding portion (410) are located dodge edge connection of opening (411) department, welding portion (410) with utmost point post (220) or utmost point ear (310) welding, dodge opening (411) with annotate liquid hole (211) and set up relatively.
  2. 2. The battery cell of claim 1, wherein the weld (410) is of unitary construction with the connection (420).
  3. 3. The battery cell according to claim 2, wherein the battery cell has a thickness direction (x), the liquid injection hole (211) and the escape opening (411) are disposed opposite to each other in the thickness direction (x), a dimension of the welding portion (410) in the thickness direction (x) is L 1 mm, and a dimension of the connecting portion (420) in the thickness direction (x) is L 2 mm, satisfying L 1 ≤L 2 .
  4. 4. The battery cell according to claim 1, wherein the welding portion (410) is snap-connected to the connecting portion (420).
  5. 5. The battery cell according to claim 4, wherein the connecting piece (400) is further provided with a clamping portion (430), the clamping portion (430) is disposed at one end of the welding portion (410) facing the connecting portion (420) and is disposed at an interval from the avoidance opening (411), the connecting portion (420) is provided with a clamping hole (421), and the clamping portion (430) is disposed through the clamping hole (421) in a penetrating manner so as to be clamped and connected with the welding portion (410) and the connecting portion (420).
  6. 6. The battery cell according to claim 1, wherein the welding portion (410) is bonded or welded to the connecting portion (420).
  7. 7. The battery cell according to claim 6, wherein the battery cell has a thickness direction (x) and a length direction (y) which intersect, the liquid injection hole (211) and the avoidance opening (411) are disposed opposite to each other in the thickness direction (x), the avoidance opening (411) is located at one end of the welding portion (410) along the length direction (y), and one end of the welding portion (410) along the length direction (y) close to the avoidance opening (411) is bonded or welded to one end of the connecting portion (420) along the length direction (y).
  8. 8. The battery cell according to claim 7, wherein the connecting piece (400) is further provided with a lap joint portion (440), the lap joint portion (440) is provided along the length direction (y) at one end of the connecting portion (420) facing the welding portion (410), the welding portion (410) is provided with a lap joint groove (412) on the surface along the thickness direction (x), and the lap joint portion (440) is embedded in the lap joint groove (412) and is adhered or welded with the groove wall of the lap joint groove (412).
  9. 9. The battery cell according to claim 8, wherein an orthographic projection shape of the lap portion (440) on the welded portion (410) in the thickness direction (x) is a polygon or an arc.
  10. 10. A battery pack comprising the battery cell according to any one of claims 1 to 9.

Description

Battery cell and battery pack Technical Field The application relates to the technical field of power batteries, in particular to a battery monomer and a battery pack. Background In the manufacturing process of the power battery, the connecting sheet is required to be welded with the pole post and the pole lug respectively, the electric connection between the pole post and the pole lug is realized through the connecting sheet, and in the traditional power battery, in order to avoid the connecting sheet to block the liquid injection hole, an avoidance opening is usually required to be formed at one end connected with the connecting sheet and the pole lug, but after the connecting sheet and the pole lug are welded, the warping phenomenon of the opening part of the connecting sheet usually occurs, and the assembly and the performance of the battery are affected. Disclosure of utility model Therefore, the application aims to overcome the defects in the prior art, and provides a battery cell which can reduce the probability of deformation of a connecting sheet after welding. The application also provides a battery pack. In order to achieve the above purpose, the technical scheme adopted by the application is as follows: In a first aspect, the present application provides a battery cell comprising a case, a top cap assembly, an electrode assembly, and a connection tab; The shell is provided with a containing cavity; The top cover assembly comprises a top cover and a pole column arranged on the top cover, and the top cover is connected with the shell and covers the accommodating cavity; The electrode assembly is positioned in the accommodating cavity, and one side of the electrode assembly, facing the top cover, is provided with a tab; The connecting piece is located hold the chamber, the connecting piece is equipped with and connects welded part and connecting portion, the welded part orientation the one end of connecting portion is equipped with dodges the opening, connecting portion at least part with the welded part is located dodge the marginal connection of opening part, the welded part with utmost point post or utmost point ear welding, dodge the opening with annotate the relative setting of liquid hole. In an alternative embodiment, the welding portion and the connecting portion are integrally formed. In an alternative embodiment, the battery cell has a thickness direction, the liquid injection hole and the avoiding opening are arranged opposite to each other in the thickness direction, the size of the welding part in the thickness direction is L 1 mm, the size of the connecting part in the thickness direction is L 2 mm, and L 1≤L2 is satisfied. In an alternative embodiment, the welding part is engaged with the connecting part. In an optional embodiment, the connecting piece is further provided with a clamping portion, the clamping portion is arranged at one end of the welding portion facing the connecting portion and is arranged at an interval from the avoidance opening, the connecting portion is provided with a clamping hole, and the clamping portion is arranged in the clamping hole in a penetrating mode to be connected with the welding portion in a clamping mode. In an alternative embodiment, the weld is adhesively bonded or welded to the connection. In an optional embodiment, the battery unit has a thickness direction and a length direction, the liquid injection hole and the avoidance opening are oppositely arranged in the thickness direction, the avoidance opening is positioned at one end of the welding part along the length direction, and one end of the welding part along the length direction, which is close to the avoidance opening, is bonded or welded with one end of the connecting part along the length direction. In an alternative embodiment, the connecting piece is further provided with a lap joint part, the lap joint part is arranged at one end of the connecting part facing the welding part along the length direction, a lap joint groove is arranged on the surface of the welding part along the thickness direction, and the lap joint part is embedded in the lap joint groove and is adhered or welded with the groove wall of the lap joint groove. In an alternative embodiment, the orthographic projection of the overlap on the welding part in the thickness direction is polygonal or arc-shaped. In a second aspect, the application provides a battery pack comprising a battery cell according to any of the preceding embodiments. The battery cell of the application has the following advantages: In the battery monomer, the welding part of the connecting sheet is used for welding with the pole post or the pole lug, so that the electric connection between the pole post and the pole lug can be realized through the connecting sheet, and as the welding part is provided with the avoidance opening which is opposite to the liquid injection hole, when electrolyte is injected into the accommodating cavity through the li