CN-224217688-U - Single battery and battery pack

Abstract

The embodiment of the application relates to the technical field of batteries, and particularly discloses a single battery and a battery pack, wherein the single battery comprises a shell, an electrode assembly, a top cover, an explosion-proof valve and an insulating component, wherein the shell is provided with a containing cavity, the electrode assembly is arranged in the containing cavity, the top cover is covered with the shell, the top cover is provided with a liquid injection hole and an explosion-proof valve opening, the explosion-proof valve is arranged on the top cover and seals the explosion-proof valve opening, the insulating component comprises an insulating main body and a flow guide part, the insulating main body is connected to one side of the top cover, which is close to the electrode assembly, the flow guide part is connected to the insulating main body, at least part of the flow guide part is positioned at one side of the insulating main body, which is close to the electrode assembly, the flow guide cavity is communicated with the liquid injection hole, one side of the flow guide part, which is close to the electrode assembly, is respectively communicated with the flow guide cavity and the containing cavity, the flow guide hole is staggered with the liquid injection hole, and the explosion-proof valve opening when the explosion-proof valve breaks. According to the application, the safety performance of the single battery is improved.

Inventors

• YANG WEI
• SHEN KUN

Assignees

• 欣旺达动力科技股份有限公司

Dates

Publication Date

20260508

Application Date

20250415

Claims (11)

1. 1. A single cell, characterized by comprising: A housing provided with a receiving chamber; An electrode assembly disposed in the receiving chamber; The top cover is used for sealing the shell, a liquid injection hole is formed in the top cover, and an explosion-proof valve opening is formed in the top cover; The explosion-proof valve is arranged on the top cover and seals the explosion-proof valve opening, and the insulating component comprises an insulating main body and a diversion part, wherein the insulating main body is connected to one side of the top cover, which is close to the electrode assembly, the diversion part is connected to the insulating main body, at least part of the diversion part is positioned on one side of the insulating main body, which is close to the electrode assembly, a diversion cavity is formed in the diversion part, the diversion cavity is communicated with the liquid injection hole, a diversion hole is formed in one side of the diversion part, which is close to the electrode assembly, the diversion hole is respectively communicated with the diversion cavity and the accommodation cavity, the diversion hole is staggered with the liquid injection hole, and when the explosion-proof valve is cracked, the diversion cavity is communicated with the explosion-proof valve opening and is communicated with the accommodation cavity and the outside of the shell through the diversion cavity and the explosion-proof valve opening).
2. 2. The battery cell of claim 1, wherein the battery cell has a first direction and a reference plane perpendicular to the first direction, and wherein, along the first direction, an orthographic projection of a hole wall of the guide hole on the reference plane and an orthographic projection of a hole wall of the liquid injection hole on the reference plane do not coincide with each other.
3. 3. The battery cell of claim 1, wherein the current guiding portion comprises a fixing portion fixedly connected to the insulating body, and The protruding portion is arranged on one side, close to the electrode assembly, of the fixing portion in a protruding mode, the flow guide cavity is formed in the protruding portion, and the flow guide hole is formed in one side, close to the electrode assembly, of the protruding portion.
4. 4. The cell of claim 3, wherein the cell has a second orientation; the diversion cavity comprises a first subchamber and a second subchamber which are communicated with each other, The first subchamber with the second subchamber is in arrange in the second direction, the first subchamber is close to than the second subchamber explosion-proof valve, works as when explosion-proof valve fracture, the first subchamber with explosion-proof valve trompil intercommunication is through first subchamber with explosion-proof valve trompil intercommunication hold the chamber with the casing is outside, the first subchamber has and is close to electrode assembly's chamber diapire, the guiding hole sets up a plurality of, a plurality of guiding hole offer in the chamber diapire, the fixed part is close to one side of the second subchamber has been seted up first through-hole, first through-hole will the second subchamber with annotate the liquid hole intercommunication.
5. 5. The unit cell according to claim 1, wherein the flow guide portion and the insulating body are provided separately.
6. 6. The cell according to claim 5, wherein the flow guiding portion has a melting point greater than that of the insulating body.
7. 7. The single battery according to claim 4, wherein the diversion part and the insulating main body are arranged separately, and a clamping part is arranged on one side of the fixing part, which is close to the insulating main body; The insulating main body is provided with a second through hole, and the second through hole communicates the first through hole with the liquid injection hole; The clamping part is arranged in the second through hole in a penetrating mode, and is clamped and fixed with the insulating main body.
8. 8. The single battery as claimed in claim 4, wherein the diversion part and the insulating main body are separately arranged, a locking groove is formed in the fixing part, a locking part is arranged on one side, close to the fixing part, of the insulating main body, and the locking part is embedded in the locking groove so as to fixedly connect the fixing part with the insulating main body.
9. 9. The unit cell according to any one of claims 4 or 7, wherein a second through hole is formed in the insulating body, the second through hole communicating the first through hole with the liquid injection hole; The outer outline size of the fixing part is larger than the inner outline size of the second through hole.
10. 10. The single battery as claimed in claim 4, wherein the flow guiding part and the insulating main body are separately arranged, a fixing groove is formed in one side, close to the top cover, of the insulating main body, a second through hole is formed in the insulating main body, and the fixing groove is communicated with the second through hole; The fixing part is embedded in the fixing groove, so that the fixing part is fixedly connected with the insulating main body, and at least part of the protruding part penetrates through the second through hole.
11. 11. A battery pack, comprising: Case body, and The unit cell according to any one of claims 1 to 10, which is provided in the case.

Description

Single battery and battery pack Technical Field The application relates to the technical field of batteries, in particular to a single battery and a battery pack. Background With the rapid development of new energy industries, secondary batteries having high energy density, long cycle life and high safety performance have been widely used and developed, and there is a strong demand for secondary batteries having larger capacity, more durability and more safety. The safety performance is one of the core performances of the secondary battery. Therefore, how to improve the safety performance of the secondary battery is a problem to be solved. Disclosure of utility model The embodiment of the application provides a single battery and a battery pack so as to improve the safety performance of the single battery. In order to solve the technical problems, the embodiment of the application discloses the following technical scheme: in one aspect, there is provided a unit cell including: A housing provided with a receiving chamber; An electrode assembly disposed in the receiving chamber; The top cover is used for covering the shell, a liquid injection hole is formed in the top cover, and an explosion-proof valve opening is formed in the top cover; An explosion-proof valve arranged on the top cover and sealing the opening of the explosion-proof valve, and The insulating component comprises an insulating main body and a flow guide part, wherein the insulating main body is connected to one side of the top cover, which is close to the electrode assembly, the flow guide part is connected to the insulating main body, at least part of the flow guide part is positioned on one side of the insulating main body, which is close to the electrode assembly, a flow guide cavity is formed in the flow guide part and communicated with the liquid injection hole, a flow guide hole is formed in one side of the flow guide part, which is close to the electrode assembly, and is respectively communicated with the flow guide cavity and the containing cavity, the flow guide hole and the liquid injection hole are staggered, and when the explosion-proof valve breaks, the flow guide cavity is communicated with the explosion-proof valve opening, and the containing cavity is communicated with the outside of the shell through the flow guide cavity and the explosion-proof valve opening. In addition to or in lieu of one or more of the features disclosed above, the cell has a first direction, and a reference plane perpendicular to the first direction; Along the first direction, the orthographic projection of the hole wall of the diversion hole on the reference plane is not overlapped with the orthographic projection of the hole wall of the liquid injection hole on the reference plane. In addition to or in lieu of one or more of the features disclosed above, the deflector comprises a securing portion fixedly connected to the insulating body, and The bulge is convexly arranged on one side of the fixing part, which is close to the electrode assembly, a flow guide cavity is arranged in the bulge, and the flow guide hole is arranged on one side of the bulge, which is close to the electrode assembly. In addition to or as an alternative to one or more of the features disclosed above, the cell has a second orientation; The flow guide cavity comprises a first subchamber and a second subchamber which are mutually communicated, the first subchamber and the second subchamber are distributed in the second direction, the first subchamber is closer to the explosion-proof valve than the second subchamber, when the explosion-proof valve is cracked, the first subchamber is communicated with the opening of the explosion-proof valve, the accommodating cavity and the outside of the shell are communicated through the opening of the first subchamber and the opening of the explosion-proof valve, the first subchamber is provided with a cavity bottom wall close to the electrode assembly, a plurality of flow guide holes are formed in the cavity bottom wall, a first through hole is formed in one side of the fixing part close to the second subchamber, and the second subchamber is communicated with the liquid injection hole through the first through hole. In addition to or as an alternative to one or more of the features disclosed above, the deflector and the insulating body are provided separately. In addition to or in lieu of one or more of the features disclosed above, the melting point of the deflector is greater than the melting point of the insulating body. In addition to one or more features disclosed above, or alternatively, the diversion portion and the insulating body are separately provided, and a fastening portion is provided on a side of the fixing portion near the insulating body; The insulating main body is provided with a second through hole which communicates the first through hole with the liquid injection hole; The buckle part is arranged in the second through hole