CN-121986402-A - Battery monomer, manufacturing method thereof, battery and electric equipment

Abstract

A battery unit (20) and a manufacturing method thereof, a battery (100) and electric equipment are provided, the battery unit (20) comprises a shell (211), an end cover (212 a), electrolyte, an electrode assembly (22) and a blocking piece (212 b), the shell (211) is provided with a first opening (106), the end cover (212 a) covers the first opening (106), the end cover (212 a) and the shell (211) are connected in a sealing mode to form a connecting part (211 c), the electrolyte is arranged in the shell (211), the electrode assembly (22) is arranged in the shell (211), and the blocking piece (212 b) is connected with the end cover (212 a) and the shell (211) and is located on one side, facing the inside of the battery unit (20), of the connecting part (211 c).

Inventors

• XU LIANGFAN
• WANG YAN
• XU HU
• LI XING
• JIN HAIZU

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260505

Application Date

20240509

Claims (20)

1. A battery cell, comprising: A housing having a first opening; An end cover covering the first opening, wherein the end cover and the shell are connected in a sealing way to form a connecting part; An electrolyte disposed within the housing; an electrode assembly disposed within the housing; And a blocking member connecting the end cap and the case and positioned at a side of the connection portion facing the inside of the battery cell.
2. The battery cell of claim 1, wherein the end cap has a first connection face and the housing has a second connection face, the first and second connection faces being disposed opposite and connected to form the connection, and at least a portion of the barrier is disposed between the first and second connection faces.
3. The battery cell of claim 2, wherein a portion of the barrier disposed between the first connection face and the second connection face is an annular structure extending in a circumferential direction of the end cap.
4. The battery cell of claim 2 or 3, wherein the end cap has a first side surface facing the inside of the battery cell and a second side surface facing away from the inside of the battery cell, and a first outer peripheral surface connecting the first side surface and the second side surface, the first connecting surface being the first outer peripheral surface, and the housing has an inner peripheral surface facing the inside of the battery cell, a portion of the inner peripheral surface forming the second connecting surface.
5. A battery cell according to claim 2 or 3, wherein the housing has a second outer peripheral surface facing away from the interior of the battery cell and an inner peripheral surface facing toward the interior of the battery cell, and an end surface connecting the inner peripheral surface and the second outer peripheral surface, the second connecting surface being the end surface, the end cap having a first side surface facing toward the interior of the battery cell, a portion of the first side surface forming the first connecting surface.
6. The battery cell of claim 5, wherein the first side is formed with a protrusion, the first connection surface being disposed around the protrusion.
7. The battery cell of claim 6, wherein a portion of the barrier is disposed between the projection and an inner peripheral surface of the housing.
8. The battery cell of any one of claims 1-7, wherein the housing has an end face, the end cap has a third side face facing the interior of the battery cell and disposed offset from the end face in a thickness direction of the end cap, and the first connection face is disposed around the third side face; The barrier includes a first portion and a second portion connected to each other, the first portion being disposed between the first and second connection surfaces, the second portion covering at least a portion of the third side surface.
9. The battery cell of claim 8, wherein the barrier covers the entire third side.
10. The battery cell of claim 8 or 9, wherein the second portion comprises a body portion and a thickened portion, the thickened portion surrounding an outer periphery of the body portion; And the maximum thickness of the thickened part is larger than that of the body part along the thickness direction of the end cover.
11. The battery cell of claim 10, wherein the thickened portion has a first side connected to the body portion and a second side connected to the first portion, the thickness of the thickened portion gradually increasing from the first side to the second side.
12. The battery cell according to claim 10 or 11, wherein the thickened portion has a maximum thickness t and satisfies 0mm < t≤3 mm.
13. The battery cell of any one of claims 8-12, wherein at least a portion of the edge region of the third side is configured as a guide ramp.
14. The battery cell of claim 13, wherein the angle between the guide ramp and the first connection surface is an obtuse angle.
15. The battery cell of claim 13 or 14, wherein the guide ramp is disposed around the end cap and forms an annular region.
16. The battery cell according to any one of claims 13-15, wherein an edge region of the third side surface is provided with a first groove, one end of which extends to the first connection surface, at least part of a groove bottom wall of which is configured as the guide slope.
17. The battery cell of claim 16, wherein the first grooves are a plurality of the first grooves spaced apart along the circumference of the end cap.
18. The battery cell of claim 17, wherein the third side surface is further provided with a second groove disposed at an end of the first groove remote from the first connection surface and in communication with the first groove.
19. The battery cell of claim 18, wherein the second groove is an annular groove extending circumferentially along the third side.
20. The battery cell of any one of claims 1-19, wherein the insulating layer has a melting point of 85 ℃ or greater and 120 ℃ or less.

Description

Battery monomer, manufacturing method thereof, battery and electric equipment Technical Field The application relates to the technical field of batteries, in particular to a battery monomer, a manufacturing method thereof, a battery and electric equipment. Background Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles. The battery is widely applied to the fields of portable electronic equipment, electric vehicles, electric tools, unmanned aerial vehicles, energy storage equipment and the like. How to improve the reliability of the battery cell and the battery is a problem to be solved in the battery technology. Disclosure of Invention The application provides a battery monomer, a manufacturing method thereof, a battery and electric equipment, and the reliability of the battery monomer and the battery can be improved. The application is realized by the following technical scheme: In a first aspect, an embodiment of the application provides a battery cell, which comprises a shell, an end cover, electrolyte, an electrode assembly and a blocking piece, wherein the shell is provided with a first opening, the end cover covers the first opening, the end cover and the shell are connected in a sealing manner to form a connecting part, the electrolyte is arranged in the shell, the electrode assembly is arranged in the shell, and the blocking piece is connected with the end cover and the shell and is positioned on one side of the connecting part facing the interior of the battery cell. According to the battery cell provided by the embodiment of the application, the blocking piece is connected with the end cover and the shell and is positioned on one side of the connecting part facing the inside of the battery cell, so that the contact probability of electrolyte and the connecting part can be reduced to a certain extent, or at least part of the connecting part is not contacted with the electrolyte, the corrosion problem of the electrolyte on the connecting part is effectively relieved, the reliability of the connecting part is improved, the leakage risk of the electrolyte is reduced, and the reliability of the battery cell and the battery is further improved. According to some embodiments of the application, the end cap has a first connection face and the housing has a second connection face, the first and second connection faces being disposed opposite and connected to form the connection. In the scheme, at least part of the blocking piece is arranged between the first connecting surface and the second connecting surface, so that the probability that electrolyte enters between the first connecting surface and the second connecting surface is reduced, at least part of the connecting portion is not contacted with the electrolyte, the corrosion problem of the electrolyte to the connecting portion is effectively relieved, the reliability of the connecting portion is improved, the risk of leakage of the electrolyte is reduced, and the reliability of a battery monomer and a battery is further improved. According to some embodiments of the application, the portion of the barrier member disposed between the first and second connection faces is an annular structure extending in a circumferential direction of the end cap. In the above scheme, because the connecting portion is annular structure, consequently set up the part that blocks between first junction surface and second junction surface for following the annular structure of circumference extension of end cover can all-round separation electrode liquid remove towards the connecting portion, has further reduced the probability that electrolyte contacted the connecting portion to guaranteed the reliability of connecting portion, reduced the risk that electrolyte revealed. According to some embodiments of the application, the end cap has a first side surface facing the inside of the battery cell and a second side surface facing away from the inside of the battery cell, and a first outer peripheral surface connecting the first side surface and the second side surface, the first connecting surface being the first outer peripheral surface, the housing has an inner peripheral surface facing the inside of the battery cell, and a portion of the inner peripheral surface forms the second connecting surface. In the above-described aspect, at least a portion of the end cap extends into the housing, whereby the first outer peripheral surface can be fixedly connected to the inner peripheral surface of the housing, thereby forming the connecting portion. At this time, the first connection surface is a first outer peripheral surf