CN-119029472-B - Battery monomer and preparation method thereof

CN119029472BCN 119029472 BCN119029472 BCN 119029472BCN-119029472-B

Abstract

The application provides a battery monomer and a preparation method of the battery monomer. The protective member is for covering at least part of the protective film from the outside. The air holes are used for communicating the space outside the protection member and the space between the protection film and the pressure release mechanism when the protection member is connected to the battery cell. In the embodiment of the application, the protection component is arranged on the outer side of the protection film, and the protection component can reduce the risk of damage deformation of the protection film in the preparation process of the battery monomer, so that the probability of damage or pollution of the pressure release mechanism by electrolyte is reduced, the pressure release mechanism can be actuated when the internal pressure of the battery monomer reaches a preset threshold value, the normal work of the pressure release mechanism is ensured, and the use safety of the battery monomer is improved.

Inventors

QUAN CHAO
PU YUJIE
LI YAO
CHEN XIAOBO

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20221212

Claims (15)

1. A battery cell, comprising: Electrode assembly, and A case inside which a receiving chamber for receiving the electrode assembly and the electrolyte is formed, the case including: a housing having an opening at one end thereof, and a pressure release mechanism provided on a wall opposite to the opening; The end cover is arranged to cover the opening and is in sealing connection with the shell, an electrode terminal and a through hole are arranged on the end cover, the electrode terminal is used for being electrically connected with the electrode assembly, and the through hole is used for injecting liquid and is positioned between the two electrode terminals on the end cover; a protective film, which is similar to the pressure release mechanism in shape and covers the pressure release mechanism for protecting the pressure release mechanism, and A protection member that is provided outside the protection film and that covers a wall of the housing provided with the pressure release mechanism, the protection member having a shape similar to a shape of the wall of the housing provided with the pressure release mechanism; Wherein a part of the protection member is connected with the housing, and a connection strength of the protection member and the protection film is smaller than a connection strength of the protection film and the housing.
2. The battery cell according to claim 1, wherein the protection member is provided with a vent penetrating the protection member in a thickness direction of the protection member, the vent being for communicating a space outside the protection member and a space between the protection film and the pressure release mechanism.
3. The battery cell according to claim 2, wherein the protective film is provided with a vent passage, the vent passage is communicated with a space between the protective film and the pressure release mechanism, and the vent hole is communicated with the vent passage.
4. The battery cell of claim 3, wherein a projection of the vent in the thickness direction at least partially overlaps a projection of the vent channel in the thickness direction.
5. The battery cell according to claim 2, wherein the protection member is provided with a plurality of ventilation holes.
6. The battery cell as recited in claim 5, wherein the protective film is attached to a first wall of the case, and the two ventilation holes are symmetrically arranged along a width direction of the first wall.
7. The battery cell of claim 5, wherein the plurality of ventilation holes are rotationally symmetrical about a central axis of the protection member.
8. The battery cell according to claim 7, wherein the plurality of ventilation holes are centrally symmetrical about a central axis of the protection member.
9. The battery cell according to claim 1, wherein the protective member includes a base layer and an adhesive layer provided on a surface of the base layer.
10. The battery cell according to claim 1, wherein a connection strength of the protection member and the protection film is smaller than a connection strength of the protection member and the case.
11. The battery cell according to claim 2, wherein the protection member is connected to the first wall on the case, the protection member includes a main body portion and an extension portion protruding from the main body portion, the ventilation hole is provided in the main body portion, and the extension portion can protrude with respect to the first wall.
12. The battery cell of claim 11, wherein at least a portion of the structure in the extension is suspended.
13. The battery cell of claim 11, wherein the number of extensions is a plurality, the plurality of extensions being disposed on opposite edges of the body portion, respectively.
14. The battery cell of claim 11, wherein the extension projects a distance D from the first wall, D satisfying 8mm D10 mm.
15. A method for preparing a battery cell, comprising the steps of: Providing a shell, an electrode assembly and a protective film, wherein a containing cavity for containing the electrode assembly and electrolyte is formed in the shell, the shell comprises a shell and an end cover, one end of the shell is provided with an opening, a pressure relief mechanism is arranged on the wall opposite to the opening, the end cover is arranged to be covered on the opening and is in sealed connection with the shell, an electrode terminal and a through hole are arranged on the end cover, the electrode terminal is used for being electrically connected with the electrode assembly, the position of the through hole on the end cover is located between the two electrode terminals, and the protective film is similar to the pressure relief mechanism in shape and covers the pressure relief mechanism and is used for protecting the pressure relief mechanism; connecting a protection member to an outer side of the protection film and covering a wall of the housing provided with the pressure release mechanism, the protection member having a shape similar to a shape of the wall of the housing provided with the pressure release mechanism, wherein a connection strength of the protection member and the protection film is smaller than a connection strength of the protection film and the housing; Injecting liquid into the battery monomer through the through hole; The protective member is separated from the protective film and the case.

Description

Battery monomer and preparation method thereof The application is based on the application number 202211587841.8, the application date 2022, 12 months and 12 days, and the application is a division application of the application of the New energy science and technology Co., ltd in Ningde times, and the application name is a preparation method of a protection component and a battery monomer. Technical Field The application relates to the technical field of batteries, in particular to a battery monomer and a preparation method of the battery monomer. Background Battery cells are widely used in electronic devices such as cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like. The battery cells may include cadmium-nickel battery cells, hydrogen-nickel battery cells, lithium ion battery cells, secondary alkaline zinc-manganese battery cells, and the like. In the development of battery technology, how to improve the safety of battery cells is an important research direction in battery technology. Disclosure of Invention In view of the above, the present application provides a battery cell and a method for preparing the battery cell, which can improve the safety of the battery. The embodiment of the application provides a protection component which is used for being connected to a battery monomer, wherein the battery monomer comprises a pressure release mechanism, and the battery monomer comprises the pressure release mechanism and a protection film arranged on the outer side of the pressure release mechanism. The protective member is for covering at least part of the protective film from the outside. In the scheme, the protection component is arranged on the outer side of the protection film, the protection component can reduce the risk of damage deformation of the protection film in the preparation process of the battery monomer, so that the probability of damage of the pressure release mechanism or pollution of electrolyte is reduced, the pressure release mechanism can be actuated when the internal pressure of the battery monomer reaches a preset threshold value, the normal operation of the pressure release mechanism is ensured, and the use safety of the battery monomer is improved. In some embodiments, the protection member is provided with ventilation holes penetrating the protection member in a thickness direction of the protection member. The breather hole is used for communicating the space outside the protection member with the space between the protection film and the pressure release mechanism when the protection member is connected to the battery cell. In the scheme, the space between the protective film and the pressure release mechanism and the outside space of the protective member can be conducted through the arrangement of the air holes, so that the risk of damage deformation of the protective film is reduced, and meanwhile, the air leakage detection requirement of the pressure release mechanism is met, and the pressure release mechanism has strong practicability. In some embodiments, the protective membrane is provided with a vent passage that communicates with a space between the protective membrane and the pressure relief mechanism. The vent holes are used to communicate the vent passage when the protection member is connected to the battery cell. In the scheme, the air holes are communicated with the exhaust channel, so that the air holes are communicated with the space between the protective film and the pressure release mechanism, the air leakage detection requirement of the pressure release mechanism is met, and the air leakage detection device has strong practicability. In some embodiments, the vent is configured such that a projection of the vent in a thickness direction at least partially overlaps a projection of the vent in a thickness direction when the protective member is connected to the battery cell. In the scheme, the conduction capability between the air holes and the exhaust channel can be improved, so that the conversion efficiency of the air positioned outside the protection component and the space between the protection film and the pressure release mechanism is ensured, the effect of balancing the air pressure is achieved, and the risk of falling off or wrinkling deformation of the protection film is reduced. Meanwhile, in the air leakage detection process of the pressure release mechanism, the design can further ensure that specific air can be effectively injected into the corresponding position of the pressure release mechanism, meanwhile, the effective detection of the concentration of air near the pressure release mechanism is ensured, and the accuracy of air leakage detection is improved. In some embodiments, the protective member is provided with a plurality of ventilation holes. In the scheme, the plurality of ventilation h