Battery cell, battery and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery monomer, a battery and an electric device. The battery monomer comprises a shell, an electrode assembly, a current collecting component, an insulating part and a protective component, wherein the shell comprises a first wall and an electrode terminal arranged on the first wall; the electrode assembly is accommodated in the shell; the current collecting component is electrically connected with the electrode assembly and the electrode terminal; the insulating part is accommodated in the shell and is arranged between the first wall and the current collecting component; and the protection component is fixed on the current collecting component and is connected with the insulating part. According to the battery monomer, the battery and the power utilization device provided by the invention, the movement of the current collecting component can be reduced.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery cell, a battery, and an electrical device. Background Art

[0002] In recent years, due to the advantages of lithium-ion batteries such as small volume, high energy density, high power density, many cycle usage times, and long storage time, the application scope of lithium-ion batteries has become increasingly wide. For example, they are used in energy storage power systems such as hydro, thermal, wind, and solar power stations, as well as in multiple fields such as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, and aerospace. With the continuous development of lithium-ion battery technology, higher requirements are put forward for the performance of lithium-ion batteries. It is hoped that lithium-ion batteries can consider multiple design factors simultaneously. Therefore, higher requirements are also put forward for their assembly and market-end failures, etc.

[0003] A current collector member is provided on the end cover of the battery cell for electrically connecting the tab and the terminal post. During assembly or use, the current collector member is prone to deformation, resulting in deformation or fracture of the current collector member, and further leading to the failure of the battery cell. Summary of the Utility Model

[0004] In view of this, it is necessary to provide a new type of battery cell and electrical device to improve the problem that the current collector member structure lacks supportive protection.

[0005] The first aspect of this application provides a battery cell, including: a housing including a first wall and electrode terminals provided on the first wall; an electrode assembly accommodated in the housing; a current collector member accommodated in the housing and connected between the electrode assembly and the electrode terminals to electrically connect the electrode assembly and the electrode terminals; an insulating member accommodated in the housing and provided between the first wall and the current collector member; and a protective member provided on the current collector member and connected to the insulating member.

[0006] In the technical solution of the embodiment of this application, by providing a protective member on the current collector member and connecting the protective member to the insulating member, the insulating member and the protective member can cooperate to provide supportive protection for the current collector member, making the current collector member not easily deformed, reducing the probability of the battery cell failing due to the deformation of the current collector member, and improving the life of the battery.

[0007] In some embodiments, the protective member and the insulating member are integrally formed. Integral formation can simplify the process steps, and because the protective member and the insulating member are integrally formed, this structure is relatively firm, can better provide better supportive protection for the current collector member, make the current collector member less likely to deform, and is not easily caused to fail at the market end, further improving the life of the battery.

[0008] In some embodiments, the electrode assembly includes a main body portion and a tab provided on the main body portion. The electrode terminal is disposed on one side of the electrode assembly along a first direction; the tab extends from the main body portion along a second direction, and the first direction and the second direction are perpendicular; the current collector member includes a first connecting portion and a second connecting portion connected to the first connecting portion. The first connecting portion is disposed on the side of the main body portion facing the electrode terminal, and the second connecting portion is disposed on the side of the main body portion facing the tab. The protection member is disposed on the side of the second connecting portion facing the electrode assembly and / or the side facing away from the electrode assembly. When the protection member is disposed on the side of the second connecting portion facing the electrode assembly, it can prevent the collision between the current collector member and the electrode assembly, making the current collector member not easily deformed and not easily causing failure at the market end, and can improve the battery life; when the protection member is disposed on the side of the second connecting portion facing away from the electrode assembly, it can reduce the collision between the current collector member and the housing, making the current collector member not easily deformed and not easily causing failure at the market end, and can improve the battery life.

[0009] In some embodiments, the protection member includes a first protection piece and a second protection piece. The first protection piece is disposed on the side of the current collector member facing away from the electrode assembly, and the second protection piece is disposed on the side of the current collector member facing the electrode assembly.

[0010] By providing the first protection piece and the second protection piece on the side of the current collector member facing away from the electrode assembly and the side facing the electrode assembly respectively, it can not only reduce the collision between the current collector member and the housing, but also reduce the collision between the current collector member and the electrode assembly, further making the current collector member not easily deformed and not easily causing failure at the market end, and can improve the battery life.

[0011] In some embodiments, the second protection piece has a first protrusion, and the insulating member has a second recess, and / or the second protection piece has a first recess, and the insulating member has a second protrusion; the second protection piece and the insulating member are in concave-convex fit. The positioning and assembly of the protection piece and the insulating member are realized through the concave-convex fit, which is convenient for the connection and separation operations of the protection piece and the insulating member.

[0012] In some embodiments, the first connecting portion includes a hole, and the protrusion of the second protection piece passes through the hole to be connected to the insulating member; or the protrusion of the insulating member passes through the hole to be connected to the second protection piece. By providing a hole in the first connecting portion and connecting the protrusion of the second protection piece through the hole to the insulating member, or connecting the protrusion of the insulating member through the hole to the second protection piece, the effect of process simplification can be achieved.

[0013] In some embodiments, the first protection piece and the insulating member are integrally formed. Integrally forming the first protection piece and the insulating member can also achieve the effect of process simplification.

[0014] In some embodiments, the first protective member has a groove, and at least a part of the tab is disposed in the groove. The tab can be completely disposed in the groove or partially disposed in the groove. Depending on the specifications of the battery, the arrangement of the tab is different. By disposing the tab in the groove, current can flow through the tab to form a path, and the contact area between the tab and the current collector member can be increased, thereby improving the over-current capacity of the battery and the rate performance of the battery.

[0015] In some embodiments, the first wall is an end cap. When the first wall is an end cap, the end cap covers the opening of the housing to isolate the internal environment of the battery cell from the external environment, maintaining the stability of the battery performance.

[0016] In some embodiments, the projection of the protective member in the first direction entirely falls within the range of the end cap. This can provide a certain space between the protective member and the housing, such that the protective member will not damage the housing when the battery shakes.

[0017] In some embodiments, the thickness of the protective member is between 0.1 mm and 1.0 mm. Limiting the thickness of the protective member within this range can both ensure a certain space between the protective member and the housing, so that the protective member will not damage the housing when the battery shakes, and ensure that the electrode assembly has a relatively large volume, maintaining a relatively high energy density.

[0018] In some embodiments, the first protective member and the second protective member are connected to each other and surround the current collector member. Compared with the case where the first protective member and the second protective member are not connected to each other, the movement of the current collector member can be prevented to a certain extent.

[0019] In a second aspect, the present application provides a battery, including the above-mentioned battery cell.

[0020] In a second aspect, an embodiment of the present application provides a battery, including the battery cell provided in any of the above embodiments.

[0021] The battery provided in the embodiment of the present application, including the battery cell provided in any of the above embodiments, can reduce the movement of the current collector member during the movement of the current collector member, thereby reducing the risk of cracking of the housing to a certain extent, or keeping the electrode assembly from being damaged by the current collector member, improving the safety of the battery cell and the battery during use, and reducing the failure of the battery.

[0022] In a third aspect, an embodiment of the present application provides an electrical device, including the battery provided in any of the above embodiments.

[0023] The electrical device provided by the embodiment of the present application includes the battery provided by any of the above embodiments, which can reduce the movement of the current collector member during the movement of the current collector member, thereby reducing the risk of cracking of the housing to a certain extent, or keeping the electrode assembly from being damaged by the current collector member, improving the safety of the battery cell, the battery and the electrical device, and reducing the failure of the battery.

[0024] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0026] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0027] Figure 2 is an exploded structural diagram of a battery provided by some embodiments of the present application;

[0028] Figure 3 is a three-dimensional schematic diagram of a battery cell provided by some embodiments of the present application;

[0029] Figure 4 is Figure 3 a partial exploded schematic diagram of the battery cell in;

[0030] Figure 5 is an assembled structural diagram of a current collector member, a protection member and a first wall in a battery cell provided by some embodiments of the present application;

[0031] Figure 6 is Figure 5 an exploded schematic diagram of the assembled structure of the current collector member, the protection member and the first wall in the battery cell in;

[0032] Figure 7 is Figure 6 an enlarged schematic diagram of part A in;

[0033] Figure 8 is a structural diagram of a protection member in a battery cell provided by some embodiments of the present application;

[0034] Figure 9Schematic diagram of a protection component in a secondary battery according to another embodiment of the present application;

[0035] Figure 10 Schematic diagram of the structure of a battery cell without the outer casing provided by some embodiments of the present application;

[0036] Figure 11 Schematic diagram of the assembly structure of a current collector component, a protection component, and an insulating component in a battery cell provided by some embodiments of the present application.

[0037] The reference numerals in the specific embodiments are as follows:

[0038] 1000, vehicle;

[0039] 100, battery; 200, controller; 300, motor;

[0040] 10, box body; 101, first part; 102, second part; 20, battery cell;

[0041] 1, electrode assembly; 11, tab; 12, main body part; 2, outer casing; 21, first wall; 211, exhaust component; 212, liquid injection hole; 3, protection component; 31, first protection part; 311, groove; 32, second protection part; 321, first protrusion; 33, connecting part; 4, electrode terminal; 5, current collector component; 51, first connecting part; 511, hole; 52, second connecting part; 7, insulating component; 71, second recess; X, first direction; Y, second direction; Z, thickness of the protection component. Specific embodiments

[0042] To make the above objects, features, and advantages of the present application more apparent and understandable, the following detailed description of the specific embodiments of the present application is provided in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0043] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in conjunction with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0045] In the description of the embodiments of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of this application.

[0046] In the description of the embodiments of this application, the terms "first" and "second" are used only for descriptive purposes to distinguish different objects, and should not be construed as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the embodiments of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0047] In the description of the embodiments of this application, the term "and / or" is merely a description of the associated relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0048] In the description of the embodiments of this application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0050] It should be noted that an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. An element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the present application are only for the purpose of illustration and do not represent the only implementation.

[0051] With the continuous development of lithium-ion battery technology, higher requirements are put forward for the performance of lithium-ion batteries. It is hoped that lithium-ion batteries can consider various design factors at the same time. Therefore, higher requirements are also put forward for their assembly and market-end failures.

[0052] A current collector member is provided on the end cover of the battery cell for electrically connecting the tab and the terminal post. During assembly or use, the current collector member is prone to deformation, resulting in deformation or fracture of the current collector member, and further causing the failure of the battery cell.

[0053] In order to improve the problem that the current collector member structure lacks support protection, an embodiment of the present application provides a battery cell. The battery cell includes a housing, an electrode assembly, a current collector member and a protection member. The housing includes a first wall and an electrode terminal provided on the first wall; the electrode assembly is accommodated in the housing; the current collector member is accommodated in the housing and is connected between the electrode assembly and the electrode terminal to electrically connect the electrode assembly and the electrode terminal; an insulating member is accommodated in the housing and is provided between the first wall and the current collector member; the protection member is provided on the current collector member and is connected to the insulating member.

[0054] In the technical solution of the embodiment of the present application, by providing a protection member on the current collector member and connecting the protection member to the insulating member, the insulating member and the protection member can cooperate to provide support protection for the current collector member, making the current collector member not easily deformed, reducing the probability of the battery cell failing due to the deformation of the current collector member, and improving the life of the battery.

[0055] The battery cell disclosed in the embodiments of the present application can be used in an electrical device using a battery as a power source or various energy storage systems using a battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0056] For the convenience of description, the following embodiments will take a vehicle 1000, which is an electrical device in an embodiment of the present application, as an example for description.

[0057] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0058] In some embodiments of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0059] Please refer to Figure 2 , Figure 2Exploded structural schematic diagram of battery 100 provided by some embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20, and the battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first part 101 and a second part 102. The first part 101 and the second part 102 cover each other, and the first part 101 and the second part 102 jointly define an accommodation space for accommodating the battery cells 20. The second part 102 may be a hollow structure with one end open, and the first part 101 may be a plate-like structure. The first part 101 covers the open side of the second part 102 so that the first part 101 and the second part 102 jointly define the accommodation space; the first part 101 and the second part 102 may also both be hollow structures with one side open, and the open side of the first part 101 covers the open side of the second part 102. Of course, the box body 10 formed by the first part 101 and the second part 102 can be in various shapes, such as a cylinder, a cuboid, etc. In some cases, the battery cells can also be directly installed on the vehicle without a box body or a housing, that is, without forming a battery pack, and the structure of the vehicle body itself serves as the fixing structure of the battery cells.

[0060] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 can also be that multiple battery cells 20 are first connected in series, in parallel, or in a hybrid connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole and are accommodated in the box body 10. The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for realizing electrical connection among the multiple battery cells 20.

[0061] Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, that is, the battery cell 20 is not limited to a square-shell battery and can also be a cylindrical battery, etc.

[0062] Please refer to Figures 3 to 4 , Figure 3 Stereoscopic schematic diagram of the battery cell 20 provided by some embodiments of the present application, Figure 4 For Figure 3Schematic diagram of partial decomposition of the battery cell. The battery cell 20 includes an electrode assembly 1, a housing 2, and a current collector member 5. The housing 2 includes a first wall 21 and an electrode terminal 4 provided on the first wall 21. The electrode assembly 1 is accommodated in the housing 2. The current collector member 5 is accommodated in the housing 2 and is connected between the electrode assembly 1 and the electrode terminal 4 to electrically connect the electrode assembly 1 and the electrode terminal 4.

[0063] See Figure 5 and Figure 6 , Figure 5 Schematic diagram of the assembly structure of the current collector member, the protection member, and the first wall in the battery cell provided by some embodiments of the present application. Figure 6 is Figure 5 Exploded view of the assembly structure of the current collector member, the protection member, and the first wall in the battery cell. The battery cell 20 further includes an insulating member 7 and a protection member 3. The insulating member 7 is accommodated in the housing 2 and is provided between the first wall 21 and the current collector member 5. The protection member 3 is provided on the current collector member 5 and is connected to the insulating member 7.

[0064] The electrode assembly 1 is the energy storage structure of the battery cell 20, the component in which an electrochemical reaction occurs in the battery cell 20. In this battery cell 20, according to actual usage requirements, the electrode assembly 1 can be set to be single or multiple. As shown in the figure, two independent electrode assemblies 1 are provided in the battery cell 20. The electrode assembly 20 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and usually a separator is provided between the positive electrode sheet and the negative electrode sheet.

[0065] The housing 2 can be a hollow cuboid, cube, or cylinder, and one of the faces of the housing 2 has an opening so that one or more electrode assemblies 1 can be placed in the housing 2. For example, when the housing 2 is a hollow cuboid or cube, one of the planes of the housing 2 is the opening surface, that is, this plane does not have a housing wall and makes the inside and outside of the housing 2 communicate. When the housing 2 can be a hollow cylinder, the circular side surface of the housing 2 is the opening surface, that is, this circular side surface does not have a housing wall and makes the inside and outside of the housing 2 communicate. The housing 2 can be filled with electrolyte.

[0066] The protection member 3 is fixed on the current collector member 5. Here, "fixed" means that the protection member 3 can be fixed on the current collector member 5 by being connected to the insulating member 7, or can be fixed on the current collector member 5 by bonding. "Fixed" also includes that there will be a small range of movement between the protection member 3 and the current collector member 5, as long as it can reduce the movement of the current collector member 5, it can be included in the present application.

[0067] By providing a protection member 3 on the current collector member 5 and connecting the protection member 3 to the insulating member 7, the protection member 3 and the insulating member 7 can cooperate to provide support protection for the current collector member 5, making the current collector member 5 not easily deformed, reducing the probability of battery cell 20 failure due to the deformation of the current collector member 5, and improving the battery life.

[0068] Refer to Figure 6 and Figure 11 , in one embodiment, the current collector member 5 can be an L-shaped structure or a sheet-like structure. The protection member 3 can be provided on the side of the current collector member 5 facing away from the insulating member 7 and connected to the insulating member 7. The protection member 3 can be connected to the insulating member 7 by drilling holes in the current collector member 5 or bypassing the current collector member 5. For example, the protection member 3 can be connected to the insulating member 7 through a connecting member 33.

[0069] In one embodiment, the protection member 3 and the insulating member 7 are integrally formed. The protection member 3 can be integrally formed with the insulating member 7 or connected to the insulating member 7 by means such as plugging or bonding. Integral formation can simplify the process steps, and because the protection member and the insulating member are integrally formed, this structure is relatively firm, can better provide better support protection for the current collector member, make the current collector member less likely to deform, and is not easily caused to fail in the market, further improving the battery life.

[0070] In one embodiment, please refer to Figure 4 , the electrode assembly 1 includes a main body portion 12 and a tab 11 provided on the main body portion 12. The electrode terminal 4 is provided on one side of the electrode assembly 1 along the first direction; the tab 11 extends from the main body portion 12 along the second direction, and the first direction and the second direction are perpendicular.

[0071] The main body portion 12 is composed of the parts of the positive electrode sheet and the negative electrode sheet having active substances, and the parts of the positive electrode sheet and the negative electrode sheet without active substances respectively form the tabs 11.

[0072] The positive electrode tab and the negative electrode tab can be located at one end of the main body portion together or at both ends of the main body portion respectively. During the charging and discharging process of the battery, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the tab 11 is connected to the electrode terminal 4 to form a current loop. The tab 11 bends inward toward the current collector member 5 and fits together with the outside of the current collector member 5. The tab 11 and the current collector member 5 can be connected by welding.

[0073] In some embodiments, the electrode assembly 1 in the battery cell can be set as a single one, which is suitable for the case where the thickness of each electrode is small after stacking. When the thickness of each electrode is large after stacking, two or more independently wound electrode assemblies 1 can also be set in the battery cell, and the pole ears 11 corresponding to each electrode assembly 1 are respectively led out from both sides of the main body 12 along the width direction. When the winding thickness of the electrode assembly 1 is large, the arc size at the bottom is large, which will cause the space utilization rate of the electrode assembly 1 on the outside of the arc on both sides of the bottom to be low, and splitting it into multiple electrode assemblies can reduce the arc size, make full use of the bottom space of the battery cell, reduce space waste, and increase the energy density of the main body. Moreover, the total thickness of the pole ear 11 is also reduced, which is also conducive to bending after welding, and the length of a single pole ear 11 can be reduced.

[0074] The first direction is the X direction in the figure, and the X direction is parallel to the electrode assembly 1 .

[0075] The second direction is the Y direction in the figure, and the Y direction is perpendicular to the electrode assembly 1. The first direction and the second direction are perpendicular to each other.

[0076] See also Figure 6 The current collecting member 5 includes a first connecting portion 51 and a second connecting portion 52 connected to the first connecting portion 51 , and the protection member 3 is disposed on a side of the second connecting portion 52 facing the electrode assembly 1 ; and / or a side away from the electrode assembly 1 .

[0077] The current collecting member 5 may be L-shaped, and the first connecting portion 51 is attached with the electrode tab 11. The protection member 3 is arranged on the side of the second connecting portion 52 facing the electrode assembly 1 and / or the side away from the electrode assembly 1, which means that the protection member 3 can be arranged only on the side facing the electrode assembly 1 or the side away from the electrode assembly 1, or can be arranged on both the side facing the electrode assembly 1 and the side away from the electrode assembly 1.

[0078] When the protection member 3 is only disposed on one side facing the electrode assembly 1 , the protection member 3 may be connected to the first connection portion 51 by a connection means such as a connector.

[0079] See also Figure 6 The protection member 3 includes a first protection member 31 and a second protection member 32 . The first protection member 31 is arranged on a side of the second connection portion 52 away from the electrode assembly 1 , and the second protection member 32 is arranged on a side of the second connection portion 52 facing the electrode assembly 1 .

[0080] When the first protective member 31 is arranged on the side of the second connecting portion 52 away from the electrode assembly 1, the first protective member 31 can be connected to the insulating member 7, and the second protective member 32 can also be connected to the insulating member 7, but one or both of the first protective member 31 and the second protective member 32 must be connected to the insulating member 7 to reduce the movement of the current collecting member 5.

[0081] Please refer to Figures 6 to 7 , Figure 6 which is Figure 5 an exploded view of the assembly structure of the current collector member, the protective member, and the first wall in the battery cell in Figure 7 , and Figure 6 is an enlarged view of part A in . The second protective member 32 has a first protrusion 321, and the insulating member 7 has a second recess 71. The second protective member 32 and the insulating member 7 are in concave-convex fit. In other embodiments, the second protective member 32 has a first recess, and the insulating member 7 has a second protrusion, and the second protective member 32 and the insulating member 7 are in concave-convex fit.

[0082] The shapes of the first protrusion 321 and the second protrusion are not limited and can be an ellipsoid, a cuboid, a cube, an irregular shape, and can be determined according to needs.

[0083] Please refer to Figures 6 to 7 . The first connecting portion 51 includes a hole 511, and the first protrusion 321 passes through the hole 511 to be connected to the insulating member 7. In other embodiments, the second protrusion passes through the hole 511 to be connected to the second protective member 32.

[0084] The hole 511 can be of any shape as long as the first protrusion 321 and the second protrusion can pass through the hole 511.

[0085] In some embodiments, the first protective member 31 and the insulating member 7 are integrally formed. Integral formation can simplify the process steps, and because the protective member and the insulating member are integrally formed, this structure is relatively firm, can better provide better support protection for the current collector member, make the current collector member less likely to deform, and is not easily caused to fail in the market end, further improving the life of the battery.

[0086] Please refer to Figures 8 to 10 . In some embodiments, the first protective member 31 has a groove 311, and part of the tab 11 is disposed in the groove 311; in other embodiments, the tab 11 can be completely disposed in the groove 311.

[0087] Please refer to Figures 4 to 6 . The first wall 21 is an end cap. When the outer shell 2 and the end cap 21 are independently provided, the end cap 21 refers to a component that covers the opening of the outer shell 2 to isolate the internal environment of the battery cell 20 from the external environment. The outer shell 2 and the end cap 21 can be two independent components. An opening can be provided on the outer shell 2, and the end cap 21 is covered at the opening to form a complete housing. Without limitation, the outer shell can also be an integrated structure, that is, the end cap 21 and the outer shell 2 are integrated. Specifically, the end cap 21 and the outer shell 2 can first form a common connection surface before other components enter the shell, and when it is necessary to encapsulate the inside of the outer shell 2, then the end cap 21 is covered on the outer shell 2.

[0088] Without limitation, the shape of the end cap 21 can be adapted to the shape of the outer shell 2 to fit the outer shell 2. Optionally, the end cap 21 can be made of a material with a certain hardness and strength, such as aluminum alloy. In this way, when the end cap 21 is squeezed or collided, it is not easily deformed, enabling the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as the electrode terminal 4 can be provided on the end cap 21. The electrode terminal 4 can be used to electrically connect to the electrode assembly 1 for outputting or inputting the electrical energy of the battery cell 20. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold can also be provided on the end cap 21. The material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. For example, the insulating member 7 can be in a plate-like structure adapted to the end cap and can be made of plastic material. Optionally, the end cap is provided on the top of the electrode assembly 1.

[0089] An exhaust member 211 and a liquid injection hole 212 are provided on the end cap. The exhaust member 211 has a notch, and the depth of the notch is less than the thickness of other regions of the exhaust member 211 except at the notch to achieve the purpose of not penetrating the exhaust member 211. That is, in the normal state, the exhaust member 211 is hermetically combined with the end cap, and the end cap is connected to the outer shell 2 at the opening of the outer shell 2 to form an outer shell for placing the battery 100, and the space formed by this outer shell is airtight. Inside this outer shell, when the gas generated by the battery 100 is too much and the gas expands to increase the air pressure inside the outer shell to exceed the preset value, the exhaust member 211 cracks at the notch, resulting in the communication between the inside and outside of the outer shell, and the gas is released outward through the crack of the exhaust member 211, thereby avoiding explosion.

[0090] Please refer to Figure 4 , the projection of the protection member 3 in the first direction entirely falls within the range of the end cap. This can create a certain space between the protection member and the housing, and when the battery shakes, the protection member will not damage the housing.

[0091] In some embodiments, the thickness Z of the protection member 3 is between 0.1 mm and 1.0 mm. Exemplarily, the thickness of the protection member 3 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc. It should be noted that in the embodiments of the present application, the thickness direction of the protection member 3 is the same as the thickness direction of the current collecting member 5.

[0092] Please refer to Figure 5 and Figure 8 , the first protection member 31 and the second protection member 32 are connected to each other and surround the current collecting member 5. At this time, compared with the situation where the first protection member 31 and the second protection member 32 are not connected to each other, the movement of the current collecting member can be further prevented to a certain extent.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing including a first wall and electrode terminals provided on the first wall; An electrode assembly accommodated in the housing; A current collector member electrically connecting the electrode assembly and the electrode terminals; An insulating member accommodated in the housing and provided between the first wall and the current collector member; And A protection member fixed to the current collector member and connected to the insulating member.

2. The battery cell according to claim 1, wherein The protection member and the insulating member are integrally formed.

3. The battery cell according to claim 1, wherein The electrode assembly includes a main body portion and tabs provided on the main body portion, and the electrode terminals are provided on one side of the electrode assembly along a first direction; the tabs extend from the main body portion along a second direction, and the first direction and the second direction are perpendicular; The current collector member includes a first connection portion and a second connection portion connected to the first connection portion. The first connection portion is provided on the side of the main body portion facing the electrode terminals, the second connection portion is provided on the side of the main body portion facing the tabs, and the protection member is provided on the side of the second connection portion facing the electrode assembly; and / or on the side facing away from the electrode assembly.

4. The battery cell according to claim 2, wherein The electrode assembly includes a main body portion and tabs provided on the main body portion, and the electrode terminals are provided on one side of the electrode assembly along a first direction; the tabs extend from the main body portion along a second direction, and the first direction and the second direction are perpendicular; The current collector member includes a first connection portion and a second connection portion connected to the first connection portion. The first connection portion is provided on the side of the main body portion facing the electrode terminals, the second connection portion is provided on the side of the main body portion facing the tabs, and the protection member is provided on the side of the second connection portion facing the electrode assembly; and / or on the side facing away from the electrode assembly.

5. The battery cell according to claim 3, wherein The protection member includes a first protection piece and a second protection piece. The first protection piece is provided on the side of the second connection portion facing away from the electrode assembly, and the second protection piece is provided on the side of the second connection portion facing the electrode assembly.

6. The battery cell according to claim 5, wherein The second protection piece has a first protrusion, and the insulating member has a second recess, and / or the second protection piece has a first recess, and the insulating member has a second protrusion; the second protection piece and the insulating member are in concave-convex fit.

7. The battery cell according to claim 6, wherein The first connection portion includes a hole, and the first protrusion passes through the hole and is connected to the insulating member; or the second protrusion passes through the hole and is connected to the second protection piece.

8. The battery cell according to claim 5, wherein The first protection piece and the insulating member are integrally formed.

9. The battery cell according to claim 5, wherein The first protection piece has a groove, and at least a part of the tab is disposed in the groove.

10. The battery cell according to any one of claims 1 to 9, characterized in that the first wall is an end cap.

11. The battery cell according to claim 10, characterized in that the end cap is disposed on one side of the electrode assembly along the first direction, and the projection of the protection member along the first direction entirely falls within the range of the end cap.

12. The battery cell according to claim 1, characterized in that the thickness of the protection member is between 0.1 mm and 1.0 mm.

13. The battery cell according to claim 5, characterized in that the first protection member and the second protection member are connected to each other and surround the current collector member.

14. A battery, characterized in that it includes the battery cell according to any one of claims 1 to 13.

15. An electrical device, characterized in that it includes the battery according to claim 14.

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