WO2023246152A1

WO2023246152A1 - Battery cell, battery, and electrical device

Info

Publication number: WO2023246152A1
Application number: PCT/CN2023/078341
Authority: WO
Inventors: 李振; 柏湘昀; 温裕乾
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-06-22
Filing date: 2023-02-27
Publication date: 2023-12-28
Also published as: CN218182424U

Abstract

The present application relates to a battery cell, a battery, and an electrical device. The battery cell comprises: a housing; an electrode assembly accommodated in the housing and comprising a first tab; an electrode terminal provided on the housing, wherein the electrode terminal is provided with an accommodating part which is recessed from the end face of the electrode terminal facing the electrode assembly; and a current collector member for connecting the first tab to the electrode terminal, wherein the current collector member comprises a protruding part which is at least partially accommodated in the accommodating part and is connected to the electrode terminal.

Description

Battery cells, batteries and electrical devices

Cross-references to related applications

This application claims priority to Chinese patent application 202221568817.5 titled "Battery Cells, Batteries and Electrical Devices" submitted on June 22, 2022. The entire content of this application is incorporated herein by reference.

Technical field

The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device.

Background technique

With the development of science and technology, batteries are widely used in various fields. Generally speaking, a battery usually includes a current collecting member for electrical connection between an electrode assembly and an electrode terminal. However, during the assembly and connection process of the existing current collecting member and the electrode terminal, there is often difficulty in positioning, resulting in current collection. The assembly and positioning accuracy of components and electrode terminals is poor.

Contents of the invention

This application provides a battery cell, a battery and an electrical device to solve the technical problem of poor assembly and positioning accuracy of existing current collecting components and electrode terminals.

In the first aspect, this application proposes a battery cell, including:

shell;

An electrode assembly contained in the housing and including a first tab; and

An electrode terminal is provided on the casing, the electrode terminal is provided with a receiving portion, and the receiving portion is recessed from the end surface of the electrode terminal facing the electrode assembly;

The current collecting member is used to connect the first tab and the electrode terminal. The current collecting member includes a protruding portion, at least part of the protruding portion is accommodated in the receiving portion and connected to the electrode terminal.

In the embodiment of the present application, the protruding portion of the current collecting member and the receiving portion of the electrode terminal can cooperate with each other, and at least part of the protruding portion is accommodated in the receiving portion and connected to the electrode terminal, thereby achieving accurate positioning of the current collecting member and the electrode terminal. function, thereby improving the accuracy of assembly and positioning of current collecting components and electrode terminals.

Optionally, in some embodiments, the current collecting member further includes a current collecting body, the current collecting body is located between the electrode terminal and the first tab and is electrically connected to the first tab;

The protruding portion protrudes from a surface of the current collecting body facing the electrode terminal.

In this embodiment, a surface of the current collector body facing away from the electrode terminal may be electrically connected to the first tab. The protruding portion protrudes from the surface of the current collecting body facing the electrode terminal, and at least part of the protruding portion is accommodated in the receiving portion and connected to the electrode terminal to achieve electrical connection between the electrode terminal and the first tab.

Optionally, in some embodiments, the current collecting member further includes an insulating layer, at least part of which surrounds the current collecting body and covers the outer periphery of the current collecting body. In this way, it can be avoided that the outer periphery of the current collector body is in direct contact with the casing and then conducts electricity, causing a short circuit of the battery cells.

Optionally, in some embodiments, the insulating layer includes:

The first part covers the surface of the current collecting body facing the electrode terminal along the circumferential direction of the current collecting body;

The second part is connected to the first part and surrounds the current collecting body and covers the outer periphery of the current collecting body; and

The third part is connected to the second part and covers the surface of the current collecting body facing the electrode assembly along the circumferential direction of the current collecting body.

In this way, the insulating layer can wrap the nearby area of the current collector body, including its outer periphery, to further prevent the current collector body from conducting electricity after direct contact with the casing, resulting in the problem of short circuit of the battery cells.

Optionally, in some embodiments, the insulating layer offsets the inner wall of the housing. In this way, the current collecting member can be positioned through the inner wall of the housing, and the positional accuracy of the electrode terminal relative to the electrode assembly can be ensured through the cooperation between the protruding portion and the receiving portion.

Optionally, in some embodiments, a surface of the current collecting body facing the electrode terminal is spaced apart from an end surface of the electrode terminal facing the electrode assembly. In this way, over-positioning can be avoided to ensure that the protruding part and the receiving part can be assembled in place, which facilitates the subsequent connection of the current collecting component and the electrode terminal. catch.

Optionally, in some embodiments, the receiving portion penetrates the electrode terminal, and the protruding portion is connected to the electrode terminal and closes the receiving portion.

In this embodiment, the protruding part can match the receiving part, so that the protruding part can close the receiving part. At this time, welding can be performed along the edge where the protruding portion contacts the receiving portion, so that the connection between the current collecting component and the electrode terminal can be made more convenient.

Optionally, in some embodiments, the current collecting member is provided with a through hole, and the through hole penetrates the protrusion and the current collecting body;

The battery cell also includes a sealing member, which is located on a side of the protrusion facing away from the current collecting body, and is connected to the electrode terminal to seal the through hole.

In this embodiment, the electrolyte can be injected into the housing through the through hole. After the liquid injection is completed, the sealing member can be connected to the electrode terminal to seal the through hole to prevent the electrolyte from leaking.

Optionally, in some embodiments, the receiving portion includes:

The first receiving area is used to receive the raised portion, and the raised portion is embedded in the first receiving area;

The second accommodating area is provided on the side of the first accommodating area away from the electrode assembly, and the cross-sectional area of the second accommodating area is greater than the cross-sectional area of the connection between the first accommodating area and the second accommodating area. The second accommodating area is used for Accommodates the seal.

In this way, on the one hand, it can be ensured that the sealing member can completely seal the through hole, and on the other hand, the end surface of the electrode terminal facing away from the electrode assembly can be ensured to be flush, which facilitates subsequent production and assembly operations.

Optionally, in some embodiments, the height of the protrusion in the axial direction of the electrode terminal is greater than the height of the first accommodation region in the axial direction of the electrode terminal. In this way, it is ensured that the protruding portion and the first receiving area can be assembled in place, which facilitates subsequent connection of the current collecting member and the electrode terminal.

Optionally, in some embodiments, the cross-sectional area of the first side of the first accommodating area is greater than the cross-sectional area of the second side of the first accommodating area, and the projection of the first side on the plane where the second side is located covers the second side. two sides;

The first side is the side of the first accommodation area facing the electrode assembly, and the second side is the side of the first accommodation area that is away from the electrode assembly.

In this way, on the one hand, it can play a certain limiting role and prevent the protruding portion from protruding from the upper surface of the first accommodation area. On the other hand, the assembly of the current collecting member and the electrode terminal can be made more convenient.

Optionally, in some embodiments, the accommodating part further includes:

The third accommodating area is provided on the side of the second accommodating area away from the first accommodating area.

In this embodiment, a third accommodating area is provided on the side of the second accommodating area away from the first accommodating area for accommodating the weld reinforcement of the sealing member to ensure the flushness of the end face of the electrode terminal away from the electrode assembly and facilitate Subsequent production and assembly operations.

Optionally, in some embodiments, the cross-sectional area of the third accommodating area is larger than the cross-sectional area of the connection between the second accommodating area and the third accommodating area.

In this way, the third accommodating area can further accommodate the weld seams and weld scars left after the seal is welded, thereby further ensuring the flushness of the end face of the electrode terminal away from the electrode assembly.

Optionally, in some embodiments, the electrode assembly further includes a second tab,

The second pole tab and the first pole tab are respectively located at opposite ends of the electrode assembly; or, the second pole tab and the first pole tab are located at the same end of the electrode assembly.

In a second aspect, this application provides a battery, including the battery cell of the first aspect.

In a third aspect, the present application provides an electrical device, including the battery of the second aspect, and the battery is used to provide electrical energy.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the drawings without exerting creative efforts.

Figure 1 is an exploded view of a battery cell provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of a current collecting component in a battery cell provided by an embodiment of the present application;

Figure 3 is a cross-sectional view of the current collecting component in the battery cell provided by the embodiment of the present application;

Figure 4 is a partial enlarged view of area A in Figure 3;

Figure 5 is a schematic assembly diagram of the current collecting component and the electrode terminal in the battery cell provided by the embodiment of the present application;

Figure 6 is a schematic structural diagram of an electrode terminal in a battery cell provided by an embodiment of the present application;

Figure 7 is an exploded view of another battery cell provided by an embodiment of the present application;

Figure 8 is a cross-sectional view of an electrode terminal in a battery cell provided by an embodiment of the present application;

Figure 9 is a partial enlarged view of area B in Figure 8;

Figure 10 is an exploded view of yet another battery cell provided by an embodiment of the present application.

In the drawings, the drawings are not necessarily drawn to actual scale.

Tag description:
1. Shell;
2. Electrode assembly; 21. First pole; 22. Second pole;
3. Electrode terminal; 31. Accommodation part; 311. First accommodating area; 312. Second accommodating area;
313. The third accommodation area;
4. Current collecting component; 41. Protruding portion; 411. Through hole; 42. Current collecting body;
5. Seals.

Detailed ways

The embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise stated, "plurality" means more than two; the terms "upper", "lower", "left", "right", "inside", " The orientation or positional relationship indicated such as "outside" is only for the convenience of describing the present application and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. Application restrictions. Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable error range. "Parallel" is not parallel in the strict sense, but within the allowable error range.

Reference in this application to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

The directional words appearing in the following description are the directions shown in the figures and do not limit the specific structure of the present application. In the description of this application, it should also be noted that, unless otherwise expressly stated Regulations and limitations, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or through an intermediate medium indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in this application may be understood based on specific circumstances.

In this application, the battery cells may include lithium ion secondary batteries, lithium ion primary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries or magnesium ion batteries, etc., which are not limited in the embodiments of this application. The battery cell may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present application are not limited to this. Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, rectangular battery cells and soft-pack battery cells. In the embodiment of the present application, the battery cells may refer to cylindrical battery cells or In order to facilitate the description of the solutions of the embodiments of the present application, a cylindrical battery cell will be taken as an example for description below.

The battery cell may include an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector that is not coated with the positive electrode active material layer protrudes from the current collector that is coated with the positive electrode active material layer. The current collector coated with the positive electrode active material layer is laminated to form a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector that is not coated with the negative electrode active material layer protrudes from the current collector that is coated with the negative electrode active material layer. The current collector coated with the negative electrode active material layer is laminated to serve as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon. The material of the separator can be polypropylene (PP) or polyethylene (polyethylene, PE). In addition, the electrode assembly may have a rolled structure or a laminated structure, and the embodiments of the present application are not limited thereto.

The applicant found that in a battery cell, the electrical connection between the tabs of the electrode assembly and the electrode terminals often needs to be achieved through a current collecting member, that is, the current collecting member is connected to the tabs and the electrode terminals respectively. When assembling a battery cell, the tabs of the electrode assembly and the current collecting member are often welded first, and then the electrode terminal and the current collecting member are position welded. However, there is a problem of difficulty in positioning between the existing current collecting component and the electrode terminal, which results in poor assembly and positioning accuracy of the current collecting component and the electrode terminal after welding. Poor, which may affect the performance of the battery cells.

Based on the above problems discovered by the applicant, the applicant has improved the structure of the battery cell. The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries containing battery cells, and electrical devices using batteries.

Next, with reference to FIGS. 1 to 10 , the battery cell provided by the embodiment of the present application will be described first.

As shown in Figure 1, an embodiment of the present application provides a battery cell, which may include:

Shell 1;

The electrode assembly 2 is contained in the housing 1 and includes a first tab; and

The electrode terminal 3 is provided in the housing 1. The electrode terminal 3 is provided with a receiving portion 31, and the receiving portion 31 is recessed from the end surface of the electrode assembly 2 facing the electrode terminal 3;

The current collecting member 4 is used to connect the first tab and the electrode terminal 3 . The current collecting member 4 includes a protruding portion 41 , at least part of the protruding portion 41 is accommodated in the accommodating portion 31 and connected to the electrode terminal 3 .

The shell 1 can be in various shapes, such as a cylinder, a cuboid, etc., and the shape of the shell 1 can be determined according to the specific shape of the electrode assembly 2 . For example, as shown in Figure 1, if the electrode assembly 2 has a cylindrical structure, the housing 1 can be selected to have a cylindrical structure. The housing 1 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., which are not particularly limited in the embodiments of the present application.

The electrode assembly 2 may be a rolled structure formed by winding a positive electrode sheet, a separator film and a negative electrode sheet, or may be a laminated structure formed by a stacked arrangement of positive electrode sheets, separator films and negative electrode sheets. The positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. The negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector. The isolation film is between the positive electrode sheet and the negative electrode sheet and is used to isolate the positive electrode sheet and the negative electrode sheet to reduce the risk of short circuit between the positive electrode sheet and the negative electrode sheet. As shown in Figure 1, the electrode assembly 2 can be accommodated in the housing 1 and can include a first tab (not shown in the figure). The first tab can be a positive tab or a negative tab, wherein the positive tab can be It is the part of the positive electrode current collector that is not coated with the positive electrode active material layer, and the negative electrode tab can be the part of the negative electrode current collector that is not coated with the negative electrode active material layer.

The electrode terminal 3 can be provided on the housing 1, wherein the electrode terminal 3 can be provided with a receiving portion 31, The accommodating portion 31 is recessed from the end surface of the electrode assembly 2 facing the electrode terminal 3 . The battery cell may further include a current collecting member 4 for connecting the first tab and the electrode terminal 3 . The current collecting member 4 may include a protruding portion 41 , at least partially received in the receiving portion 31 , so that the current collecting member 4 is connected to the electrode terminal 3 . For example, after the current collecting member 4 can be welded to the first tab, its protruding portion 41 can extend into the receiving portion 31 and be welded to the receiving portion 31 to connect the current collecting member 4 to the electrode terminal 3, thereby achieving The electrical connection between the first tab and the electrode terminal 3.

It can be understood that the casing 1 may have an opening, and the battery cell may also include an end cover. The end cover may be connected to the casing 1 and close the opening area of the casing 1 , and the electrode terminal 3 may be disposed on the end cover. Among them, the electrode terminal 3 can be connected to the end cover by gluing or riveting. The connection position between the end cover and the electrode terminal 3 is provided with an insulating material to avoid short circuit caused by conduction between the electrode terminal 3 and the end cover.

In the embodiment of the present application, the protruding portion 41 of the current collecting member 4 and the receiving portion 31 of the electrode terminal 3 can cooperate with each other, and at least part of the protruding portion 41 is accommodated in the receiving portion 31 and connected to the electrode terminal 3 to function as a collector. The current collecting member 4 and the electrode terminal 3 are accurately positioned, thereby improving the assembly and positioning accuracy of the current collecting member 4 and the electrode terminal 3.

In addition, in the prior art, in order to be able to be connected to the first tab of the electrode assembly 2 and the electrode terminal 3 at the same time, the current collecting member 4 is usually designed as a bent structure. When assembled in the housing 1, it often occupies a lot of space inside the housing 1. space, resulting in low space utilization of battery cells. The surface of the current collecting member 4 away from the electrode terminal 3 provided in the embodiment of the present application is connected to the first tab, and the protruding portion 41 is connected to the electrode terminal 3 by being accommodated in the accommodating portion 31. In this way, the protruding portion 41 does not need to be connected to the electrode terminal 3. Occupying the space in the housing 1, the current collecting member 4 can ensure the connection strength with the first tab and the electrode terminal 3 while saving the space in the housing 1, effectively improving the space utilization of the battery cell. .

Optionally, in some embodiments, the current collecting member 4 further includes a current collecting body 42, which is located between the electrode terminal 3 and the first tab and is electrically connected to the first tab;

The protruding portion 41 protrudes from the surface of the current collecting body 42 facing the electrode terminal 3 .

As shown in FIG. 2 , in this embodiment, the current collecting member 4 may include a current collecting body 42 and a protruding portion 41 , wherein the current collecting body 42 may be located between the electrode terminal 3 and the first tab. The current collecting body 42 The surface facing away from the electrode terminal 3 may be electrically connected to the first tab. The raised portion 41 protrudes from the set The surface of the flow body 42 facing the electrode terminal 3 and at least part of the protruding portion 41 are accommodated in the accommodating portion 31 and connected to the electrode terminal 3 to achieve electrical connection between the electrode terminal 3 and the first tab.

It can be understood that both the current collecting body 42 and the protruding portion 41 are made of metal, and the protruding portion 41 can be connected to the current collecting body 42 by welding, screwing, riveting, etc. The current collecting body 42 and the protruding portion 41 may also be integrally formed, and are not specifically limited here.

Optionally, as shown in FIG. 3 , in some embodiments, the current collecting member 4 further includes an insulating layer, at least part of which surrounds the current collecting body 42 and covers the outer periphery of the current collecting body 42 . It can be understood that the casing 1 is usually made of metal, and an insulating layer is provided around the outer periphery of the current collector body 42 to prevent the outer periphery of the current collector body 42 from being in direct contact with the casing 1 and causing electrical conduction, resulting in a short circuit of the battery cells.

The insulating layer can be connected to the current collecting body 42 by injection molding, or can be covered with an insulating layer on the outer periphery of the current collecting body 42 by spraying, which is not specifically limited here.

Optionally, in some embodiments, the insulation layer may include:

The first part covers the surface of the current collecting body 42 facing the electrode terminal 3 along the circumferential direction of the current collecting body 42;

The second part is connected to the first part and surrounds the current collecting body 42 and covers the outer periphery of the current collecting body 42; and

The third part is connected to the second part and covers the surface of the current collecting body 42 facing the electrode assembly 2 along the circumferential direction of the current collecting body 42 .

As shown in FIG. 4 , the insulating layer may include a first part, a second part and a third part connected in sequence, wherein the second part may surround the current collecting body 42 and cover the outer periphery of the current collecting body 42 , and the first part and the third part may be connected in sequence. Parts respectively cover two surfaces of the current collecting body 42 along the circumferential direction of the current collecting body 42 . In this way, the insulating layer can wrap the nearby area of the current collector body 42 including its outer periphery, further preventing the current collector body 42 from conducting electricity after direct contact with the casing 1 and causing a short circuit of the battery cells.

Optionally, in some embodiments, the insulating layer offsets the inner wall of the housing 1 . As shown in FIG. 1 , when the outer periphery of the current collecting body 42 is covered with an insulating layer, the cross section of the current collecting member 4 can match the inner wall of the housing 1 so that the insulating layer can offset the inner wall of the housing 1 . In this way, the current collecting member 4 can be positioned through the inner wall of the housing 1, and further can be positioned through the convex The cooperation between the raised portion 41 and the receiving portion 31 ensures the position accuracy of the electrode terminal 3 relative to the electrode assembly 2 .

For example, the protruding portion 41 may be located at the center of the current collecting body 42 to offset the insulation layer on the outer periphery of the current collecting body 42 against the inner wall of the housing 1 . The electrode terminal 3 can also be located at the center of the end cover. When the protruding portion 41 is accommodated in the accommodating portion 31, it can be ensured that the electrode terminal 3 and the protruding portion 41 are on the extension line of the center of the housing 1. In this way, the end cover and the housing can be ensured. 1 When connected, it can just close the opening area of the housing 1.

Optionally, as shown in FIG. 5 , in some embodiments, the surface of the current collecting body 42 facing the electrode terminal 3 is spaced apart from the end surface of the electrode terminal 3 facing the electrode assembly 2 .

It can be understood that when at least part of the protruding portion 41 is accommodated in the accommodating portion 31, it is necessary to make the upper surface of the protruding portion 41 flush with the upper surface of the accommodating portion 31, and then weld the current collecting member 4 and the electrode terminal 3 are connected together. The surface of the current collecting body 42 facing the electrode terminal 3 is spaced apart from the end surface of the electrode terminal 3 facing the electrode assembly 2, which can avoid over-positioning and ensure that the protruding portion 41 and the receiving portion 31 can be assembled in place, which facilitates subsequent assembly. Connection of flow member 4 to electrode terminal 3 . For example, when the protruding portion 41 is deformed or there is an assembly error, the surface of the current collecting body 42 facing the electrode terminal 3 is prevented from contacting the end surface of the electrode terminal 3 facing the electrode assembly 2 first, and the positioning function is given priority. As a result, the upper surface of the protruding portion 41 and the upper surface of the receiving portion 31 cannot be flush, which is not conducive to welding.

Optionally, in some embodiments, the receiving portion 31 penetrates the electrode terminal 3 , and the protruding portion 41 is connected to the electrode terminal 3 and closes the receiving portion 31 .

Referring to FIGS. 6 to 8 , the accommodating portion 31 can penetrate the electrode terminal 3 , in other words, the electrode terminal 3 can be hollowed out to accommodate the protruding portion 41 of the current collecting member 4 . The protruding portion 41 can match the receiving portion 31 so that the protruding portion 41 can close the receiving portion 31 . At this time, welding can be performed along the edge where the protruding portion 41 contacts the receiving portion 31 , so that the connection between the current collecting member 4 and the electrode terminal 3 can be made more convenient.

Optionally, in some embodiments, the current collecting member 4 is provided with a through hole 411 that penetrates the protruding portion 41 and the current collecting body 42;

The battery cell also includes a sealing member 5 , which is located on the side of the protruding portion 41 away from the current collecting body 42 . The sealing member 5 is connected to the electrode terminal 3 to seal the through hole 411 .

It can be understood that the battery cell may also include electrolyte, that is, the electrolyte needs to be injected into the interior of the casing 1 . Based on this, as shown in FIGS. 3 and 5 , the current collecting member 4 is provided with a through hole 411 penetrating the protruding portion 41 and the current collecting body 42 , and the electrolyte can be injected into the interior of the housing 1 through the through hole 411 .

As shown in Figure 7, the battery cell may also include a sealing member 5. The sealing member 5 may be located on the side of the protruding portion 41 away from the current collecting body 42. After the liquid injection is completed, the sealing member 5 may be connected to the electrode terminal 3. To seal the through hole 411 to prevent the electrolyte from leaking.

Optionally, in some embodiments, the receiving portion 31 includes:

The first receiving area 311 is used to receive the raised portion 41, and the raised portion 41 is embedded in the first receiving area 311;

The second accommodating area 312 is provided on the side of the first accommodating area 311 away from the electrode assembly 2, and the cross-sectional area of the second accommodating area 312 is larger than the cross-sectional area of the connection between the first accommodating area 311 and the second accommodating area 312, The second receiving area 312 is used to receive the seal 5 .

As shown in FIGS. 8 and 9 , the accommodating portion 31 may include a first accommodating area 311 for accommodating the protruding portion 41 , and a second accommodating area 312 for accommodating the sealing member 5 . The shape of the first accommodating area 311 can match the protruding portion 41 so that the protruding portion 41 is embedded in the first accommodating area 311 and welded to the inner wall of the first accommodating area 311 . The second accommodating area 312 may be disposed on a side of the first accommodating area 311 away from the electrode assembly 2, and the cross-sectional area of the second accommodating area 312 may be larger than the cross-sectional area of the connection between the first accommodating area 311 and the second accommodating area 312, This is to ensure that the seal 5 welded to the second accommodation area 312 can completely seal the through hole 411 . In addition, the seal 5 is located in the second accommodating area 312, which can ensure the flushness of the end surface of the electrode terminal 3 facing away from the electrode assembly 2, which facilitates subsequent production and assembly operations.

Optionally, in some embodiments, the height of the protruding portion 41 in the axial direction of the electrode terminal 3 is greater than the height of the first receiving area 311 in the axial direction of the electrode terminal 3 . In this way, it can be ensured that when the protruding portion 41 is deformed or there is an assembly error, the upper surface of the protruding portion 41 can be in contact with the upper surface of the first accommodating area 311 (that is, the first accommodating area 311 and the second accommodating area 312 (the connection point) is flush to ensure that the protruding portion 41 and the first receiving area 311 can be assembled in place, which facilitates the subsequent connection of the current collecting member 4 and the electrode terminal 3 .

Optionally, in some embodiments, the cross-sectional area of the first side of the first accommodating area 311 is larger than the cross-sectional area of the second side of the first accommodating area 311, and the projection of the first side on the plane where the second side is located cover Cover second side;

The first side is the side of the first accommodation area 311 facing the electrode assembly 2 , and the second side is the side of the first accommodation area 311 facing away from the electrode assembly 2 .

In this embodiment, as shown in FIG. 8 , the cross-sectional area of the side of the first accommodating area 311 facing the electrode assembly 2 is larger than the cross-sectional area of the side of the first accommodating area 311 facing away from the electrode assembly 2 , that is, the cross-sectional area of the first accommodating area 311 The cross section increases in the direction toward the electrode assembly 2 . And the cross section of the first receiving area 311 may be in the shape of an isosceles trapezoid. It can be understood that the protruding part 41 may be fitted with the first receiving area 311, that is, the protruding part 41 may be in the shape of a truncated cone. In this way, on the one hand, it can play a certain limiting role to prevent the protruding portion 41 from protruding from the upper surface of the first accommodation area 311 . On the other hand, the assembly of the current collecting member 4 and the electrode terminal 3 can be made more convenient.

Optionally, in some embodiments, the accommodating part 31 further includes:

The third accommodating area 313 is provided on the side of the second accommodating area 312 away from the first accommodating area 311 .

As shown in FIGS. 8 and 9 , the accommodating part 31 may further include a third accommodating area 313 . It can be understood that when the sealing member 5 is welded to the second accommodating area 312, the weld reinforcement may protrude beyond the second accommodating area 312, causing the end surface of the electrode terminal 3 facing away from the electrode assembly 2 to be uneven. Based on this, a third accommodating area 313 can be provided on the side of the second accommodating area 312 away from the first accommodating area 311 for accommodating the weld reinforcement of the seal 5 to ensure that the end face of the electrode terminal 3 faces away from the electrode assembly 2 The smoothness facilitates subsequent production and assembly operations. The height of the third accommodation area 313 in the axial direction of the electrode terminal 3 may be greater than or equal to the preset height threshold. The preset height threshold may be set according to the actual height of the weld seam reinforcement. For example, the preset height threshold may be 0.2mm, 0.3mm or 0.5mm, etc., there is no specific limit here.

Optionally, as shown in FIG. 9 , in some embodiments, the cross-sectional area of the third accommodating area 313 is larger than the cross-sectional area of the connection between the second accommodating area 312 and the third accommodating area 313 . In this way, the third accommodating area 313 can further accommodate the weld seams and weld scars left after the seal 5 is welded, thereby further ensuring the flushness of the end surface of the electrode terminal 3 away from the electrode assembly 2 .

The cross-sectional area of the third accommodating area 313 is larger than the cross-sectional area of the connection between the second accommodating area 312 and the third accommodating area 313 .

Optionally, in some embodiments, the electrode assembly 2 further includes a second tab 22,

The second tab 22 and the first tab are respectively located at opposite ends of the electrode assembly 2; or, the second tab 22 and the first tab are located at the same end of the electrode assembly 2.

In this embodiment, the electrode assembly 2 may further include a second tab 22 , wherein one of the first tab and the second tab 22 is a positive tab, and the other is a negative tab.

As shown in FIG. 1 , the second tab 22 and the first tab may be located at opposite ends of the electrode assembly 2 respectively. There may also be two current collecting members 4 and two electrode terminals 3 , respectively located on opposite sides of the housing 1 . In this case, one electrode terminal 3 is electrically connected to the first tab 22 through one current collecting member 4; the other electrode terminal 3 is electrically connected to the second tab 22 through the other current collecting member 4.

As shown in FIG. 10 , the second tab 22 and the first tab 21 may also be located at the same end of the electrode assembly 2 . In this case, the end cap includes two electrode terminals 3 , and the current collecting structure may also include two protrusions 41 . One of the electrode terminals 3 is electrically connected to the first tab 21 through a protruding portion 41 , and the other electrode terminal 3 is electrically connected to the second tab 22 through the other protruding portion 41 .

An embodiment of the present application also provides a battery, which may include any of the above battery cells. It can be understood that the battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

In a battery, there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, parallel, or mixed. Hybrid connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, parallel, or mixed together, and then the whole composed of multiple battery cells can be accommodated in the box. Multiple battery cells can also be connected in series, parallel, or mixed to form a battery. module. Multiple battery modules are connected in series, parallel, or mixed to form a whole, and are accommodated in the box.

An embodiment of the present application also provides an electrical device, which may include the above-mentioned battery, and the battery may be used to provide electrical energy. Among them, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle or a hybrid vehicle. Powered cars or extended-range cars, etc.; spacecraft include airplanes, rockets, space shuttles and spaceships, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric aircraft toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric Plane and so on. The embodiments of this application impose no special restrictions on the above electrical equipment.

Although the application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the application, in particular provided that no structural conflicts exist , the technical features mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A battery cell including:

shell,

an electrode assembly contained within the housing and including a first tab, and

An electrode terminal is provided on the housing, the electrode terminal is provided with a receiving portion, and the receiving portion is recessed from an end surface of the electrode terminal facing the electrode assembly,

a current collecting member for connecting the first tab and the electrode terminal, the current collecting member including a protruding portion, at least part of the protruding portion is accommodated in the receiving portion and connected to the electrode terminal .
The battery cell according to claim 1, wherein the current collecting member further includes a current collecting body located between the electrode terminal and the first tab and electrically connected to the third tab. One pole ear,

The protruding portion protrudes from a surface of the current collecting body facing the electrode terminal.
The battery cell according to claim 2, wherein the current collecting member further includes an insulating layer, at least part of the insulating layer surrounds the current collecting body and covers an outer peripheral edge of the current collecting body.
The battery cell according to claim 3, wherein the insulating layer includes:

The first part covers the surface of the current collecting body facing the electrode terminal along the circumferential direction of the current collecting body,

a second part connected to the first part, surrounding the current collecting body and covering the outer periphery of the current collecting body, and

The third part is connected to the second part and covers the surface of the current collecting body facing the electrode assembly along the circumferential direction of the current collecting body.
The battery cell according to claim 3 or 4, wherein the insulating layer offsets the inner wall of the housing.
The battery cell according to any one of claims 2 to 5, wherein a surface of the current collector body facing the electrode terminal is spaced apart from an end surface of the electrode terminal facing the electrode assembly.
The battery cell according to any one of claims 2 to 6, wherein the accommodating portion penetrates the electrode terminal, and the protruding portion is connected to the electrode terminal and closes the accommodating portion. department.
The battery cell according to claim 7, wherein

The current collecting member is provided with a through hole, and the through hole penetrates the protruding portion and the current collecting body,

The battery cell further includes a sealing member located on a side of the protrusion facing away from the current collecting body, and the sealing member is connected to the electrode terminal to seal the through hole.
The battery cell according to claim 8, wherein the receiving portion includes:

A first receiving area is used to receive the protruding portion, and the protruding portion is embedded in the first receiving area,

A second accommodation area is provided on a side of the first accommodation area away from the electrode assembly, and the cross-sectional area of the second accommodation area is larger than the connection between the first accommodation area and the second accommodation area. cross-sectional area, and the second accommodation area is used to accommodate the seal.
The battery cell according to claim 9, wherein a height of the protruding portion in an axial direction of the electrode terminal is greater than a height of the first accommodation region in an axial direction of the electrode terminal.
The battery cell according to claim 9, wherein the cross-sectional area of the first side of the first accommodating area is larger than the cross-sectional area of the second side of the first accommodating area, and the first side is in the The projection of the plane on which the second side lies covers said second side,

Wherein, the first side is a side of the first accommodation area facing the electrode assembly, and the second side is a side of the first accommodation area facing away from the electrode assembly.
The battery cell according to claim 9, wherein the receiving part further includes:

The third accommodating area is provided on the side of the second accommodating area away from the first accommodating area.
The battery cell according to claim 12, wherein the cross-sectional area of the third accommodating area is larger than the cross-sectional area of the connection between the second accommodating area and the third accommodating area.
The battery cell according to any one of claims 1 to 13, wherein the electrode assembly further includes a second tab,

The second pole tab and the first pole tab are respectively located at opposite ends of the electrode assembly; or, the second pole tab and the first pole tab are located at the same end of the electrode assembly.
A battery including the battery cell according to any one of claims 1-14.
An electrical device includes the battery according to claim 15, and the battery is used to provide electrical energy.