CN-224232882-U - Battery cell, battery device and electricity utilization device

CN224232882UCN 224232882 UCN224232882 UCN 224232882UCN-224232882-U

Abstract

The application discloses a battery unit, a battery device and an electricity utilization device, wherein the battery unit comprises a shell and an electrode assembly, the shell is provided with a containing cavity, the shell is provided with a first wall, a pressure release mechanism is arranged on the first wall, the electrode assembly is contained in the containing cavity and comprises a main body part and a tab, the tab is arranged on at least one side of the main body part along a first direction, a cutting part is arranged on one side of the tab, facing the pressure release mechanism, along a second direction, the cutting part is used for avoiding the pressure release mechanism, and the second direction is intersected with the first direction. According to the scheme provided by the application, the cutting part is arranged on the tab, and the cutting part can avoid the pressure relief mechanism, so that the tab cannot interfere with the pressure relief mechanism on the first wall after the tab is connected with the first wall.

Inventors

Zhan Guanghao
ZHENG WENHUI
ZHANG JIANPING
TANG DAICHUN
LAI YOULEI
SHI CHUNMEI
ZHENG SONGHAI

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250318

Claims (12)

1. A battery cell, comprising: The shell is provided with a containing cavity, the shell is provided with a first wall, and a pressure release mechanism is arranged on the first wall; an electrode assembly accommodated in the accommodating cavity, the electrode assembly including a main body portion and a tab disposed at least one side of the main body portion in a first direction; the pole lug faces to one side of the pressure relief mechanism along a second direction, a cutting part is arranged on the side, facing away from the pressure relief mechanism, of the pole lug, and the second direction is intersected with the first direction.
2. The battery cell according to claim 1, wherein the tab is integrally formed in a trapezoidal structure, and a dimension of the tab in the second direction toward the main body is larger than a dimension of the tab in the second direction away from the main body; The cutting part is formed between one side, away from the main body part, of the tab along the first direction and one side, facing the pressure release mechanism, of the tab along the second direction.
3. The battery cell according to claim 2, wherein the tab includes a first trapezoidal portion and a second trapezoidal portion, a dimension of the first trapezoidal portion in the second direction toward the main body portion side being greater than a dimension of the first trapezoidal portion in the second direction toward the second trapezoidal portion side; the first trapezoid part is connected with the main body part, the second trapezoid part is connected with one side, away from the main body part, of the first trapezoid part, and one side, facing the pressure release mechanism, of the second trapezoid part is provided with the cutting part.
4. The battery cell according to claim 3, wherein a side of the first trapezoid portion facing the main body portion is provided with an extension portion, and a dimension of the extension portion in the second direction is larger than a dimension of the first trapezoid portion facing the main body portion side in the second direction.
5. The battery cell of claim 3, wherein a dimension of the first trapezoid in the second direction and a dimension of the second trapezoid in the second direction gradually increase along a direction in which the second trapezoid is directed toward the main body.
6. The battery cell of claim 4, wherein the extension is a distance L3 from the side of the body portion in the second direction, wherein L3 is greater than or equal to 5mm.
7. The battery cell of claim 4, wherein the extension is configured to have a circular arc structure on both sides in the second direction.
8. The battery cell according to any one of claims 3 to 7, wherein a length of the first trapezoid portion in the second direction toward the second trapezoid portion side is L1, and a length of a portion where the cutting portion and the first trapezoid portion overlap toward the second trapezoid portion side in the second direction is L2, wherein L2 and L1 satisfy 0.1+.l2:l1+.0.5.
9. The battery cell of claim 8, wherein the second trapezoid has a dimension L4 in a third direction, the pressure relief mechanism has a radius R1, the weld formed by welding the second trapezoid to the first wall has a dimension L5 in the third direction, wherein L4, L5, and R1 satisfy 0.2-L4: r1-0.5, and L4< L5, the third direction intersecting a plane formed by the first and second directions.
10. The battery cell of any one of claims 2 to 6, wherein corners of the trapezoid structures in the second direction are each arc-shaped structures.
11. A battery device comprising a battery cell according to any one of claims 1 to 10.
12. An electrical device comprising the battery device of claim 11.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery cell, a battery device and an electricity utilization device. Background The battery tab is used as an important component in a lithium ion battery, and is mainly used as a contact point of an anode and a cathode in the charge and discharge process of the battery and is responsible for conducting out electric energy in the battery. The lugs in the related art are easy to interfere with the explosion-proof valve position on the top cover during assembly. Disclosure of utility model In view of the above, the present application provides a battery cell, a battery device and an electric device, which can solve the problem that the tab is easy to interfere with the position of the explosion-proof valve on the top cover when being assembled. In order to solve the above technical problems, in a first aspect, the present application provides a battery cell, including: The shell is provided with a containing cavity, the shell is provided with a first wall, and a pressure release mechanism is arranged on the first wall; an electrode assembly accommodated in the accommodating cavity, the electrode assembly including a main body portion and a tab disposed at least one side of the main body portion in a first direction; the pole lug faces to one side of the pressure relief mechanism along a second direction, a cutting part is arranged on the side, facing away from the pressure relief mechanism, of the pole lug, and the second direction is intersected with the first direction. According to the technical scheme, the cutting part is arranged on the tab, and the cutting part can avoid the pressure relief mechanism, so that the tab cannot interfere with the pressure relief mechanism on the first wall after the tab is connected with the first wall. In some embodiments, the tab is integrally of a trapezoid structure, and a dimension of the tab along the second direction toward the main body is greater than a dimension of the tab along the second direction away from the main body; The cutting part is formed between one side, away from the main body part, of the tab along the first direction and one side, facing the pressure release mechanism, of the tab along the second direction. Because the whole tab is of a trapezoid structure, the whole area of the tab is larger, so that the conductive sectional area of the tab can be increased, the charge and discharge efficiency of the battery is improved, the internal resistance is reduced, and the heating is reduced. In some embodiments, the tab includes a first trapezoidal portion and a second trapezoidal portion, a dimension of the first trapezoidal portion along the second direction toward the body portion side being greater than a dimension of the first trapezoidal portion along the second direction toward the second trapezoidal portion side; the first trapezoid part is connected with the main body part, the second trapezoid part is connected with one side, away from the main body part, of the first trapezoid part, and one side, facing the pressure release mechanism, of the second trapezoid part is provided with the cutting part. In some embodiments, an extension is provided on a side of the first trapezoid toward the main body, and a dimension of the extension in the second direction is greater than a dimension of the first trapezoid toward the main body. Therefore, the surface area of the tab can be increased, the heat dissipation effect is improved, and the temperature rise caused by heating of the tab is reduced, so that the overcurrent capacity is improved. In some embodiments, the first trapezoid portion increases in size in the second direction and the second trapezoid portion increases in size in the second direction along a direction in which the second trapezoid portion points toward the main body portion. The area of the lug facing the main body part is increased, so that current can be dispersed, and the fracture risk of the main body part caused by stress concentration is reduced. In some embodiments, the distance from the extension to the side of the main body portion is L3 in the second direction, wherein L3 is greater than or equal to 5mm. In some embodiments, the extension portion is provided with a circular arc structure along two sides of the second direction. In some embodiments, the length of the first trapezoid part along the second direction towards the side of the second trapezoid part is L1, and the length of the superposition part of the cutting part and the first trapezoid part along the side of the second trapezoid part along the second direction is L2, wherein L2 and L1 satisfy that L2 is less than or equal to 0.1 and L2 is less than or equal to 0.5. In some embodiments, the second trapezoid part has a dimension L4 along a third direction, the pressure relief mechanism has a radius R1, the