CN-122029667-A - Battery cell, battery device and electricity utilization device

CN122029667ACN 122029667 ACN122029667 ACN 122029667ACN-122029667-A

Abstract

A battery unit (12), a battery device (100) and an electric device belong to the technical field of battery devices (100). The battery cell (12), the battery cell (12) includes a housing (1212), an end cap (1211), an electrolyte, an electrode assembly, and a barrier (125), the housing (1212) having an opening. The end cap (1211) covers the opening, and the end cap (1211) and the housing (1212) are hermetically connected to form a connecting portion (126). The electrolyte is disposed within the housing (1212). The electrode assembly is disposed within a housing (1212). The blocking piece (125) is connected with the end cover (1211) and the shell (1212), and the blocking piece (125) is positioned on one side of the connecting part (126) away from the inside of the battery cell (12) and covers the connecting part (126). Even if the connecting part (126) fails, the blocking part (125) covers the connecting part (126) from one side of the connecting part (126) deviating from the inside of the battery cell (12), and the blocking part (125) can play a role of blocking electrolyte, so that the risk that the electrolyte leaks to the outer side of the battery cell (12) is reduced, and the reliability of the battery cell (12) is improved.

Inventors

ZHOU WENLIN
ZHANG QIANQIAN
HUANG WEIHONG
XU LIANGFAN
ZHENG YULIAN
WANG PENG

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20240731

Claims (20)

A battery cell, comprising: A housing having an opening; an end cover covering the 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 the blocking piece is connected with the end cover and the shell, is positioned on one side of the connecting part, which is away from the inside of the battery cell, and covers the connecting part.
The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The end cover has a first surface facing away from the interior of the battery cell, and the housing has a first outer peripheral surface facing away from the interior of the battery cell; The barrier includes a first portion covering at least a portion of the first surface and a second portion covering at least a portion of the first peripheral surface.
The battery cell according to claim 1 or2, wherein, The blocking member is an annular structure extending in a circumferential direction of the opening.
The battery cell of claim 2, wherein the battery cell comprises a plurality of cells, The battery cell further comprises an electrode terminal, the electrode terminal is arranged on the end cover, the maximum size of the electrode terminal protruding from the first surface along the thickness direction of the end cover is D 1 , and the maximum size of the first part protruding from the first surface is D 2 ,0.2mm≤D 2 ≤D 1 .
The battery cell according to any one of claims 1 to 4, wherein, The end cover is provided with a second surface facing the inside of the battery cell, a first surface facing away from the inside of the battery cell, and a second outer peripheral surface connecting the first surface and the second surface, the shell is provided with an inner peripheral surface facing the inside of the battery cell, and a part of the inner peripheral surface is connected with the second outer peripheral surface to form the connecting part.
The battery cell of claim 5, wherein the battery cell comprises a plurality of cells, The housing has a first outer peripheral surface facing away from the inside of the battery cell and an end surface connecting the inner peripheral surface and the first outer peripheral surface, and the blocking member covers the end surface.
The battery cell according to any one of claims 1 to 4, wherein, The shell is provided with a first outer peripheral surface which is away from the inside of the battery cell, an inner peripheral surface which faces the inside of the battery cell and an end face which connects the inner peripheral surface and the first outer peripheral surface, the end cover is provided with a second surface which faces the inside of the battery cell, and a part of the second surface is connected with the end face to form the connecting part.
The battery cell of claim 7, wherein the battery cell comprises a plurality of cells, The end cap has a first surface facing away from the interior of the battery cell and a second peripheral surface connecting the first surface and the second surface, the barrier covering the second peripheral surface.
The battery cell according to any one of claims 1-8, wherein, The barrier is an insulating material.
The battery cell according to any one of claims 1-9, wherein, The melting point of the barrier is 85 ℃ or higher and 120 ℃ or lower.
The battery cell according to any one of claims 1-10, wherein, The barrier comprises at least one of paraffin wax, rosin, PE wax, polyolefin, stearic acid, and white oil.
The battery cell according to any one of claims 1-11, wherein, The end cap has a first surface facing away from the interior of the battery cell, at least a portion of an edge region of the first surface being configured as a guide ramp.
The battery cell of claim 12, wherein the battery cell comprises a plurality of cells, The end cap further has a second surface facing the inside of the battery cell, and a second outer peripheral surface connecting the first surface and the second surface; an included angle formed between the guide inclined surface and the second peripheral surface is an obtuse angle.
The battery cell according to claim 12 or 13, wherein, The guide ramp is disposed around the end cap and forms an annular region.
The battery cell according to any one of claims 12-14, wherein, The end cap further includes a second surface facing the inside of the battery cell, and a second outer circumferential surface connecting the first surface and the second surface; The edge region of the first surface is provided with a first groove, one end of which extends to the second peripheral surface, and at least part of the groove bottom wall of the first groove is configured as the guide slope.
The battery cell of claim 15, wherein the battery cell comprises a plurality of cells, The first grooves are formed in a plurality of mode, and the first grooves are arranged at intervals along the circumferential direction of the end cover.
The battery cell of claim 15 or 16, wherein the cell comprises a plurality of cells, The first surface is also provided with a second groove, and the second groove is arranged at one end of the first groove away from the second peripheral surface and is communicated with the first groove.
The battery cell of claim 17, wherein the battery cell comprises a plurality of cells, The second groove is an annular groove extending along the circumferential direction of the first surface.
A battery device comprising the battery cell of any one of claims 1-18.
The battery device of claim 19, wherein the battery device comprises a battery cell, The plurality of battery cells are arranged along a first direction, and a heat insulation pad is arranged between two adjacent battery cells; The end cover has a first surface facing away from the interior of the battery cell, and the housing has a first outer peripheral surface facing away from the interior of the battery cell; The barrier includes a first portion covering at least a portion of the first surface and a second portion covering at least a portion of the first outer peripheral surface, at least a portion of the second portion being located between two of the battery cells adjacent in the first direction; Along the first direction, a projection of the second portion does not overlap a projection of the insulation blanket.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the technical field of battery devices, in particular to a battery cell, a battery device and an electric device. 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. How to improve the reliability of the battery cell is a problem to be solved in the battery technology. Disclosure of Invention In view of the above, the present application provides a battery cell, a battery device, and an electric device, which can improve the reliability of the battery cell. In a first aspect, the present application provides a battery cell including a housing having an opening, an end cap, an electrolyte, an electrode assembly, and a barrier. The end cover covers the opening, and the end cover is connected with the shell in a sealing way to form a connecting part. The electrolyte is disposed in the housing. The electrode assembly is disposed within the housing. The blocking piece is connected with the end cover and the shell, is positioned on one side of the connecting part, which is away from the inside of the battery cell, and covers the connecting part. In the technical scheme of the embodiment of the application, even if the connecting part fails, the blocking part covers the connecting part from one side of the connecting part, which is far away from the inside of the battery cell, and the blocking part can play a role of blocking electrolyte, so that the risk of leakage of the electrolyte to the outer side of the battery cell is reduced, and the reliability of the battery cell is improved. In one or more embodiments of the first aspect, the end cap has a first surface facing away from the interior of the cell, and the housing has a first outer peripheral surface facing away from the interior of the cell. The barrier includes a first portion covering at least a portion of the first surface and a second portion covering at least a portion of the first peripheral surface. In the scheme, the first part and the second part are positioned on different surfaces of the shell of the battery monomer, so that the area of the connecting interface of the blocking piece is increased, the adhesive force of the blocking piece is improved, the risk of sealing failure caused by the connection failure of the blocking piece is reduced, and the reliability of the battery monomer is further improved. In one or more embodiments of the first aspect, the barrier is an annular structure extending along a circumference of the opening. In the scheme, the blocking piece is of an annular structure, electrolyte can be blocked in all directions, the leakage probability of the electrolyte is reduced, and therefore the reliability of the battery monomer is further improved. In one or more embodiments of the first aspect, the battery cell further includes an electrode terminal disposed on the end cap, the electrode terminal protruding from the first surface by a maximum dimension D 1 and the first portion protruding from the first surface by a maximum dimension D 2,0.2mm≤D2≤D1 in a thickness direction of the end cap. In the scheme, when D 2 is more than or equal to 0.2mm, the first part has a certain thickness, so that the first part has good performance of blocking the leakage of electrolyte, and the battery monomer has higher reliability, when D 2≤D1, the blocking piece does not interfere with the assembly of an electrode terminal, so that the assembly difficulty of the battery monomer is reduced, and the assembly efficiency of the battery monomer is improved, and when D 2≤D1 is less than or equal to 0.2mm, the battery monomer has higher reliability and the assembly efficiency of the battery monomer is also improved. In one or more embodiments of the first aspect, the end cap has a second surface facing the inside of the battery cell and a first surface facing away from the inside of the battery cell, and a second outer peripheral surface connecting the first surface and the second surface, the housing has an inner peripheral surface facing the inside of the battery cell, and a portion of the inner peripheral surface is connected with the second outer peripheral surface to form the connection portion. In the above-mentioned scheme, at least part of end cover stretches into the casing inside, and the second outer peripheral face of end cover just can be connected fixedly with the inner peripheral face of casing to form the connecting portion. In one or more embodiments of the first aspect, the housing has a first outer peripheral surface facing away from the interior of the b