CN218300182U

CN218300182U - Battery cell, battery and consumer

Info

Publication number: CN218300182U
Application number: CN202222195426.XU
Authority: CN
Inventors: 雷育永; 郭志君; 王鹏; 金海族; 李川
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2023-01-13
Anticipated expiration: 2032-08-19

Abstract

The embodiment of the application provides a battery cell, a battery and electric equipment. The battery cell includes: an electrode assembly including a body part and a tab extending from the body part; a case for accommodating the electrode assembly and having a first opening; the first end cover is used for covering the first opening; a tab support located between the first end cap and the body portion for supporting a tab; the first end cover is provided with a first clamping structure, the lug support is provided with a second clamping structure, the first clamping structure and the second clamping structure are configured to be mutually clamped when the relative distance between the first end cover and the lug support in the first direction belongs to a preset range, so that the relative movement of the first end cover and the lug support is limited, and the first direction is parallel to the first end cover. The technical scheme of this application can promote the free assembly success rate of battery when improving the performance of battery.

Description

Battery cell, battery and consumer

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

With the increasing environmental pollution, the new energy industry is more and more concerned by people. In the new energy industry, battery technology is an important factor regarding its development.

The development of battery technology requires consideration of various design factors, such as energy density, cycle life, safety performance, and the like. The structure of the battery cell is critical to the performance of the battery, and in addition, the requirements for assembly vary from cell to cell. Therefore, how to provide a single battery to improve the performance of the battery and the success rate of assembly is an urgent technical problem to be solved.

SUMMERY OF THE UTILITY MODEL

The application provides a battery monomer, battery and consumer can promote the success rate of the free assembly of battery when improving the performance of battery.

In a first aspect, the present application provides a battery cell, comprising: an electrode assembly including a body part and a tab extending from the body part; a case for accommodating the electrode assembly, the case having a first opening; the first end cover is used for covering the first opening; a tab support located between the first end cap and the body portion, the tab support for supporting the tab; the first end cover is provided with first joint structure, the utmost point ear support is provided with second joint structure, first joint structure with second joint structure is configured into, and the two relative distance on the first direction can the joint when belonging to the scope of predetermineeing, in order to restrict first end cover with the relative movement of utmost point ear support, the first direction is on a parallel with first end cover.

In an embodiment of the present application, a battery cell includes an electrode assembly, a case, a first end cap, and a tab holder. In the single battery, the electrode assembly comprises a body part and a tab extending from the body part, the shell is provided with a first opening and used for accommodating the electrode assembly, the first end cover is used for covering the first opening, and the tab support is positioned between the first end cover and the body part and used for supporting the tab. Therefore, the problems of short circuit and the like caused by the fact that the electrode lugs are inserted backwards into the electrode assembly due to overlong electrode lugs can be avoided, and the safety performance of the battery is improved. The first end cover is provided with a first clamping structure, the lug support is provided with a second clamping structure, and the first clamping structure and the second clamping structure are clamped to realize connection of the first end cover and the lug support. The first clamping structure and the second clamping structure are configured to clamp when the relative distance between the first clamping structure and the second clamping structure in a first direction belongs to a preset range so as to limit the relative movement of the first end cover and the lug support, wherein the first direction is parallel to the first end cover. Like this, when first joint structure and second joint structure do not align completely, also can realize the joint of first joint structure and second joint structure, be convenient for first end cover and utmost point ear support be connected, be favorable to reducing the equipment degree of difficulty of first end cover and utmost point ear support, the free equipment of battery of being convenient for.

In a possible implementation manner, the first clamping structure faces towards the protruding portion of the electrode assembly along the second direction, the second clamping structure corresponds to the opening structure of the protruding portion, and the second direction is the thickness direction of the first end cover. In this way, the first end cap is provided with the protruding portion protruding toward the electrode assembly, the tab holder is provided with the opening structure corresponding to the protruding portion, and the first end cap is connected to the tab holder by the cooperation of the protruding portion and the opening structure.

In one possible implementation manner, the opening structure includes a guide portion, which is oriented toward the electrode assembly along a second direction, the radial dimension of the guide portion gradually decreases, the guide portion is used for guiding the protrusion portion to be clamped into the opening structure, and the second direction is a thickness direction of the first end cap. In this way, the guide portion can guide the projection portion to be snapped into the opening structure in the case of the tab holder being offset from the first end cap in the first direction.

In one possible implementation, the protrusion, the guide, the housing, and the tab support satisfy: D0-D4 is more than or equal to f (W0-W1); wherein D0 is a radial dimension at a first end of the guide portion along the first direction, the first end of the guide portion being an end of the guide portion away from the electrode assembly along the second direction; d4 is a radial dimension of a first end of the protrusion along the first direction, the first end of the protrusion being an end of the protrusion near the electrode assembly along the second direction; w0 is the distance between the inner surfaces of the housings along the first direction; w1 is the dimension of the tab holder along the first direction; f (W0-W1) is a positive correlation function of W0-W1.

In the implementation mode, the relationship between D0-D4 and W0-W1 is reasonably configured, so that the size of the guide part along the first direction can be ensured to be large enough, and the clamping connection of the protruding part and the opening structure is favorably realized when the tab support and the first end cover relatively deviate in the first direction.

In one possible implementation, f (W0-W1) = a × (W0-W1), a is 0.4 to 1. In actual production and use, the clearance between the lug support and the shell along the first direction is smaller than the difference between the distance between the inner surface of the shell in the first direction and the size of the lug support. By setting a to be 0.4-1, the sizes of the protruding parts and the opening structures can be flexibly set according to specific requirements.

In one possible implementation manner, the opening structure includes a clamping groove portion, the clamping groove portion is connected with one end, close to the electrode assembly, of the guide portion along the second direction, and the protruding portion is clamped with the clamping groove portion. Like this, behind the bulge card income draw-in groove portion, can realize spacing in the second direction, realize first end cover and utmost point ear support fixed in the second direction.

In one possible implementation manner, the clamping groove portion includes a position limiting portion and a receiving portion, the receiving portion is close to the electrode assembly relative to the position limiting portion, a radial dimension of the position limiting portion is smaller than a radial dimension of the receiving portion, and the position limiting portion and the receiving portion form a step structure. In this way, after the protruding portion enters the groove portion, the protruding portion can be partially accommodated in the accommodating portion, and the stopper portion can restrict the movement of the protruding portion in the second direction to prevent the protruding portion from coming out of the accommodating portion.

In one possible implementation, the protruding portion includes a main body portion and a buckle, the buckle is close to the electrode assembly relative to the main body portion, the buckle includes a clamping portion and a connecting portion, the clamping portion is connected with the main body portion through the connecting portion, and a first end of the protruding portion is an end of the protruding portion close to the electrode assembly in the second direction; the radial dimension of joint portion is greater than the radial dimension of connecting portion, joint portion with draw-in groove portion joint. Like this, realized spacing and fixed to joint portion in the second direction.

In one possible implementation, the buckle is provided with a deformation groove extending from an end of the buckle close to the electrode assembly toward the first end cap in the second direction, and the deformation groove is configured to be deformable when the clamping portion enters the clamping groove portion so that the clamping portion is clamped into the clamping groove portion. Like this, when the buckle when spacing portion, the buckle can diminish in the size of first direction to the buckle can get into the portion of holding, realizes the joint of buckle and draw-in groove portion.

In one possible implementation, the guide portion, the buckle and the deformation groove satisfy: d3 > D3 > D3-s0; d3 is the radial size of the first end of the clamping portion along the first direction, and the first end of the clamping portion is the end, far away from the electrode assembly, of the clamping portion along the second direction; d3 is a radial dimension of the second end of the guide portion along the first direction, the second end of the guide portion being an end of the guide portion near the electrode assembly along the second direction; s0 is a distance between two opposing groove wall surfaces of the deformation groove. Therefore, the clamping buckle can be clamped into the clamping groove part, and the clamping buckle can be prevented from being separated from the clamping groove part.

In one possible implementation, the catch and the guide satisfy: D3-D3 is more than 0.5mm. Thus, the buckle is not easy to be separated from the clamping groove part.

In a possible implementation manner, the guide portion, the buckle and the deformation groove satisfy: D3-D3+ s0 is greater than 0.2mm. Thus, the buckle is favorably embedded into the clamping groove part.

In a possible realization, the angle between the guide and the second direction is less than 45 °. In this way, the guide portion guides the projection to be caught in the opening structure.

In a possible implementation manner, the main body portion is provided with a first fixing portion and a transition portion, a radial dimension of the first fixing portion is larger than a radial dimension of the transition portion, and the first fixing portion is connected with the buckle through the transition portion; the opening structure includes a second fixing portion that communicates with the guide portion and is away from the electrode assembly with respect to the guide portion, and the first fixing portion abuts against the second fixing portion. Therefore, the first end cover and the lug support can be limited and fixed in the first direction through the matching of the first fixing part and the second fixing part.

In a possible implementation manner, a size of the first fixing portion and/or the second fixing portion in the second direction is greater than 0.8mm. Thus, the connection strength between the first fixing part and the second fixing part is enhanced

In a possible implementation manner, along a second direction, the size of the first clamping structure is smaller than that of the second clamping structure, and the second direction is the thickness direction of the first end cover. Thus, it is possible to prevent abrasion between the protrusions and the opening structure or to prevent the protrusions from protruding from the opening structure to damage the electrode assembly.

In one possible implementation, the first and second snap structures are circular in cross-section. Like this, can all realize assembly and spacing to first joint structure and second joint structure at free length direction of battery and width direction.

In one possible implementation, the tab holder is provided with a groove extending in a first direction, and the tab is configured to be connected with the electrode terminal of the first end cap through the groove. Therefore, the tab can penetrate through the groove of the tab support to be connected with the electrode terminal, so that the tab can be limited and fixed through the groove of the tab support.

In a possible implementation manner, the first end cap further includes an insulating member and an end cap, the insulating member is used for isolating the end cap and the electrode assembly, and the insulating member and the first clamping structure are of an integrally formed structure. Therefore, the first clamping structure and the insulating piece can be conveniently machined.

In a possible implementation manner, the first end cover is provided with a plurality of first clamping structures, and the tab holder is provided with a plurality of second clamping structures correspondingly arranged with the first clamping structures.

In a second aspect, the present application provides a battery comprising a battery cell as described in the first aspect and any possible embodiment thereof; and the box body is used for accommodating the battery monomer.

In a third aspect, the present application provides an electrical device comprising the battery of the second aspect, the battery being configured to supply power to the electrical device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic illustration of a vehicle according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

FIG. 4 is a schematic structural view of a first endcap of an embodiment of the present application;

fig. 5 is a schematic structural view of a tab holder according to an embodiment of the present application;

fig. 6 is a top view of a tab holder according to an embodiment of the present application;

fig. 7 is a sectional view of the tab holder of fig. 6 taken along the direction C-C;

FIG. 8 is a cross-sectional view of the open structure of FIG. 7;

FIG. 9 is an enlarged schematic view of the projection of FIG. 4;

fig. 10 is a front view of a battery cell according to an embodiment of the present application;

fig. 11 is an enlarged structural view of the region B in fig. 10.

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

Detailed Description

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

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

The directional terms used in the following description are intended to refer to directions shown in the drawings, and are not intended to limit the specific structure of the present application. In the description of the present application, it should also be noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed and removable connections as well as integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

The term "and/or" in this application is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the preceding and following associated objects are in an "or" relationship.

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the single battery of cylindricality battery, square battery monomer and laminate polymer battery monomer, this application embodiment is also not limited to this.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery pack and the like. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and an isolating membrane. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative current collector, and the mass flow body protrusion in the mass flow body of coating the negative pole active substance layer of uncoated negative pole active substance layer, the mass flow body of uncoated negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be polypropylene (PP) or Polyethylene (PE). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

In order to meet different power requirements, a battery may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. Optionally, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form a battery. That is, a plurality of battery cells may directly constitute a battery, or a battery module may be first constituted and then a battery may be constituted. The battery is further arranged in the electric equipment to provide electric energy for the electric equipment.

The development of battery technology should take into consideration various design factors such as energy density, cycle life, discharge capacity, charge and discharge rate, safety, etc. The cell structure is critical to the performance of the battery and different cell structures have different requirements for assembly. Therefore, how to provide a single battery cell is an urgent technical problem to be solved, which improves the performance of the battery and the success rate of assembly.

The inventor finds that a tab supporting structure can be arranged for avoiding the reverse insertion of a tab into an electrode assembly in the prior art, but the position of the tab supporting structure in a battery unit cannot be effectively fixed, so that the tab cannot be effectively supported, or even if a fixing structure is arranged between the tab supporting structure and an end cover, the requirements on the assembly precision and the manufacturing precision are high, and the assembly efficiency and the assembly success rate of the battery unit are greatly influenced.

In view of this, the embodiment of the present application provides a battery cell, and the battery cell includes an electrode assembly, a case, a first end cap and a tab holder. In the single battery, the electrode assembly comprises a body part and a tab extending from the body part, the shell is provided with a first opening and used for accommodating the electrode assembly, the first end cover is used for covering the first opening, and the tab support is positioned between the first end cover and the body part and used for supporting the tab. Therefore, the problems of short circuit and the like caused by the fact that the electrode lugs are inserted backwards into the electrode assembly due to overlong electrode lugs can be avoided, and the safety performance of the battery is improved. The first end cover is provided with a first clamping structure, the lug support is provided with a second clamping structure, and the first clamping structure and the second clamping structure are clamped to realize connection of the first end cover and the lug support. The first clamping structure and the second clamping structure are configured to be clamped when the relative distance between the first clamping structure and the second clamping structure in a first direction belongs to a preset range so as to limit the relative movement of the first end cover and the lug support, wherein the first direction is parallel to the first end cover. Like this, when first joint structure and second joint structure do not align completely, also can realize the joint of first joint structure and second joint structure, the first end cover of being convenient for is connected with utmost point ear support, is favorable to reducing the equipment degree of difficulty of first end cover and utmost point ear support, the free equipment of battery of being convenient for.

The technical scheme described in the embodiment of the application is applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships, spacecrafts and the like, and the spacecrafts comprise airplanes, rockets, space shuttles, spacecrafts and the like.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applied to the above-described devices, but may also be applied to all devices using batteries, and for brevity of description, the following embodiments are all described by taking an electric vehicle as an example.

For example, as shown in fig. 1, which is a schematic structural diagram of a vehicle according to an embodiment of the present disclosure, the vehicle 1 may be a fuel-oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, wherein the controller 30 is used for controlling the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, for example, the battery 10 may be used as an operation power supply of the vehicle 1 for a circuit system of the vehicle 1, for example, for power demand for operation at the start, navigation, and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operation power source of the vehicle 1 but also as a driving power source of the vehicle 1 instead of or in part of fuel or natural gas to provide driving power to the vehicle 1.

In order to meet different power usage requirements, the battery 10 may include a plurality of battery cells. For example, as shown in fig. 2, the battery 10 may include a plurality of battery cells 20 for a schematic structure of a battery according to an embodiment of the present disclosure. The battery 10 may further include a case 11, the inside of the case 11 is a hollow structure, and the plurality of battery cells 20 are accommodated in the case 11. For example, a plurality of battery cells 20 are connected in parallel or in series or in a combination of series and parallel to each other and then placed in the case 11.

Optionally, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member for electrically connecting the plurality of battery cells 20, such as in parallel or in series-parallel. Specifically, the bus member may achieve electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus bar member may be fixed to the electrode terminals of the battery cells 20 by welding. The electric energy of the plurality of battery cells 20 can be further extracted through the case 11 by the conductive mechanism. Alternatively, the current conducting means can also belong to the current collecting part.

The number of the battery cells 20 may be set to any number according to different power requirements. A plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve greater capacity or power. Since the number of the battery cells 20 included in each battery 10 may be large, the battery cells 20 may be arranged in groups for convenience of installation, each group of the battery cells 20 constituting a battery module. The number of the battery cells 20 included in the battery module is not limited and may be set as required. The battery may include a plurality of battery modules, which may be connected in series, parallel, or series-parallel.

Fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present application. In one embodiment of the present application, as shown in fig. 3, the battery cell 20 includes an electrode assembly 22, a case 210, a first end cap 211, and a tab holder 23.

The electrode assembly 22 includes a body portion 222 and tabs 221 extending from the body portion 222.

The body portion 222 of the electrode assembly 22 is electrically connected to the electrode terminal 211a through the tab 221.

Alternatively, the tab 221 extends from the body portion 222 in the thickness direction of the first end cap 211. Tab 221 may include a positive tab and a negative tab, wherein the positive tab and the negative tab may extend from the same end of body portion 222 or may extend from different ends of body portion 222. For example, the positive electrode tab extends from an end of the body portion 222 close to the first end cap 211 in the thickness direction of the first end cap 211, and the negative electrode tab extends from an end of the body portion 222 far from the first end cap 211 in the thickness direction of the first end cap 211. The relative positions of the positive electrode tab and the negative electrode tab can be specifically set according to practical requirements, and the embodiment of the application does not specifically limit the relative positions.

The case 210 has a first opening 210a for accommodating the electrode assembly 22, the first opening 210a being disposed at one end near the first end cap 211 in a z-direction perpendicular to the first end cap 211. The shape of the case 210 may be determined according to the shape of one or more electrode assemblies 22 combined, and for example, the case 210 may be a hollow rectangular parallelepiped, a cube, or a cylinder.

Fig. 4 is a schematic structural diagram of a first end cap according to an embodiment of the present application. As shown in fig. 3 and 4, in the case that the battery cell 20 is a prismatic battery cell, the first end cap 211 may have a plate shape, and the first end cap 211 is used to cover the first opening 210a to seal the first opening 210, thereby isolating the electrode assembly 22 in the case 210 from the outside.

The first end cap 211 is provided with electrode terminals 211a, and tabs 221 of the electrode assembly 22 are electrically connected to the electrode terminals 211a.

Optionally, the battery cell 20 includes a second end cap 212, the second end cap 212 being disposed opposite the first end cap 211 along the z-direction. In the battery cell 20, the case 210 is provided with a second opening 220a, the second opening 220a is provided at an end near the second end cap 212 in the z direction, and the second end cap 212 is used to cover the second opening 220a.

Alternatively, the second end cap 212 is not provided with an electrode terminal, only the first end cap 211 is provided with an electrode terminal 211a, and the electrode assembly 22 enters the case 210 through the second opening 220a.

Optionally, the second end cap 212 is provided with an electrode terminal electrically connected with a tab near the second opening 220a. The second end cap 212 may have the same structure as the first end cap 211, that is, the second end cap 212 is provided with the same structure as the first clamping structure, and the second end cap 212 may also have a different structure from the first end cap 211.

Fig. 5 is a schematic structural view of a tab holder according to an embodiment of the present application. As shown in fig. 3 and 5 in combination, a tab holder 23 is provided between the body portion 222 and the first end cap 211, and the tab holder 23 serves to support a tab 221. Thus, it is possible to prevent the tabs 221 from being inserted upside down into the electrode assembly to cause a short circuit.

As shown in fig. 4 and 5, the first end cap 211 is provided with a first clamping structure 2111, the tab holder 23 is provided with a second clamping structure 231, and the first clamping structure 2111 and the second clamping structure 231 are configured to be clamped with each other when a relative distance therebetween in a first direction is within a predetermined range, where the first direction is parallel to the first end cap 211.

The first direction may be an x direction in fig. 3, and a size of the battery cell 20 in the x direction is greater than a size of the battery cell 20 in the y direction.

During the assembly of the battery cell 20, the first end cap 211 and the case 210 are fixed in position, the electrode assembly 22 with the tab support 23 assembled thereon is loaded into the case 210 through the second opening 220a, and the second clamping structure 231 of the tab support 23 is matched with the first clamping structure 2111 of the first end cap 211 to connect the first end cap 211 with the tab support 23 or the electrode assembly 22. Since the expansion space of the electrode assembly 22 is reserved in the case 210, after the electrode assembly 22 with the tab holder 23 mounted therein is mounted in the case 210, the tab holder 23 may be shifted in a first direction relative to the first end cap 211, so that the first clamping structure 2111 and the second clamping structure 231 are shifted relative to each other, and the connection between the first clamping structure 2111 and the second clamping structure 231 cannot be achieved.

First clamping structure 2111 and second clamping structure 231 are configured as, can joint each other when relative displacement of first end cover 211 and utmost point ear support 23 belongs to predetermined range in the first direction, can realize being connected of first end cover 211 and utmost point ear support 23 under the circumstances that utmost point ear support 23 and first end cover 211 take place relative skew in the first direction, are favorable to reducing the equipment and the assembly degree of difficulty of battery monomer 20, improve the success rate of the assembly of battery monomer 20. The specific structures of the first clamping structure 2111 and the second clamping structure 231 are not limited, as long as the first clamping structure 2111 and the second clamping structure 231 can be clamped within a preset range.

Alternatively, the battery cell 20 may further include a first separation film 24, and the first separation film 24 is disposed on the outer surface of the electrode assembly 22 and may serve to separate the electrode assembly 22 from the case 210. During assembly of the battery cell 20, the electrode assembly 22, the tab holder 23, the first separator 24, and the second end cap 212 may be coupled together to form an electrode assembly as a whole. For example, the first separation film 24 is coated on the outer surface of the electrode assembly 22, and then the first separation film 24 is connected to the second terminal cover 212 and the tab holder 23 by means of heat fusion, thereby forming an electrode assembly as a whole. Before the first separator 24 is connected to the tab holder 23, the tab 221 may be inserted into the groove 601 of the tab holder 23 corresponding to the tab 221, so that the root portion (end close to the electrode assembly 22) of the tab 221 is tightly attached to the tab holder 23, thereby preventing the tab 221 from being folded over and inserted into the electrode assembly 22. After the electrode assembly is integrally formed, the electrode assembly is integrally placed in the case 210 through the second opening 220a, and after the tab holder 23 is coupled to the first end cap 211, the first end cap 211 is coupled to the case 210, thereby completing the assembly of the battery cell 20.

The embodiment of the present application provides a battery cell 20, and this battery cell 20 includes: electrode assembly 22, case 210, first end cap 211 and tab holder 23. The electrode assembly 22 includes a body portion 222 and tabs 221 extending from the body portion 222. The case 210 has a first opening 210a for receiving the electrode assembly 22, a first cap 211 for covering the first opening 210a, and a tab holder 23 between the first cap 211 and the body part 222 for supporting a tab 221. Thus, the problems of short circuit and the like caused by the fact that the tabs 221 are inserted backwards into the electrode assembly 22 due to the fact that the tabs 221 are too long can be avoided, and the safety performance of the battery is improved. First end cover 211 is provided with first joint structure 2111, and utmost point ear support 23 is provided with second joint structure 231, and first joint structure 2111 can realize being connected of first end cover 211 and utmost point ear support 23 with second joint structure 231 joint. The first and

second clamping structures

2111 and 231 are configured to be capable of clamping with each other at a relative distance of the first end cap 211 and the tab holder 23 within a predetermined range in a first direction, wherein the first direction is parallel to the first end cap 211. Like this, when first joint structure 2111 and second joint structure 231 are not completely aligned in the first direction, also can realize the joint of first joint structure 2111 and second joint structure 231, be convenient for first end cover 211 and utmost point ear support 23 be connected, be favorable to reducing the assembly degree of difficulty of first end cover 211 and utmost point ear support 23, promote the success rate of first end cover 211 and utmost point ear support 23's assembly to promote the success rate of the assembly of battery monomer 20.

In an embodiment of the present application, the first latching structure 2111 is a protrusion 50 protruding toward the electrode assembly 22 in a second direction, the second latching structure 231 is an opening structure 60 corresponding to the protrusion 50, and the second direction is a thickness direction of the first end cap 211.

The second direction may be the z direction in fig. 3 to 5. The protrusion 50 protrudes toward the electrode assembly 22 in the z-direction with respect to the first end cap 211, and the opening structure 60 corresponds to the protrusion 50.

The opening structure 60 may or may not penetrate the tab holder 23 in the second direction, that is, the opening structure 60 may be a groove depressed toward the electrode assembly 22, or a through-hole.

In this embodiment, the first clamping structure 2111 is clamped with the second clamping structure 231 by the projection 50 and the opening structure 60 corresponding to the projection.

Alternatively, the second snap structure 231 is a projection projecting away from the electrode assembly 22, and the first snap structure 2111 is an opening structure corresponding to the projection. In this application, the first clamping structure 2111 or the second clamping structure 231 may be set as a protrusion according to actual needs, and the second clamping structure 231 or the first clamping structure 2111 is an opening structure corresponding to the protrusion.

Fig. 6 is a plan view illustrating a tab holder according to an embodiment of the present application, fig. 7 is a sectional view of the tab holder of fig. 6 taken along the direction C-C, and fig. 8 is a sectional view illustrating an opening structure of fig. 7. In an embodiment of the present application, as shown in fig. 6 to 8 in combination, the opening structure 60 includes a guide portion 61, which is oriented toward the electrode assembly 22 along a second direction, the radial dimension of the guide portion 61 gradually decreases, wherein the second direction is a thickness direction of the first end cap 211; the guide portion 61 is used to guide the protrusion 50 to be snapped into the opening structure 60.

The guide portion 61 may have a truncated cone shape or a truncated pyramid shape, and the radial dimension of the guide portion 61 is the maximum dimension of the projection of the guide portion 61 on the xoz plane in the x direction. For example, when the guide portion 61 is a truncated cone-shaped guide portion, the size of the guide portion 61 is the diameter of the guide portion 61.

In the second direction, the radial dimension of the guide portion 61 is gradually reduced in a direction toward the electrode assembly 22.

When the tab holder 23 and the first end cover 211 are relatively offset in the first direction, the positions of the first end cover 211 and the housing 210 are fixed, and the guide part 61 can guide the protrusion 50 to be inserted into the opening structure 60 along the guide part 61 under the action of the guide part 61. That is, the guide portion 61 may guide the tab holder 23 to move in the first direction so as to move the tab holder 23 to a proper position, so that the protrusion 50 may be gradually caught in the opening structure 60 along the guide portion 61 during the movement of the tab holder 23.

Fig. 9 is an enlarged structural view of the protruding portion in fig. 4. Fig. 10 is a front view of a battery cell according to an embodiment of the present application. In an embodiment of the present application, as shown in fig. 7 to 10, the protruding part 50, the guide part 61, the housing 210 and the tab holder 23 satisfy: D0-D4 is more than or equal to f (W0-W1).

D0 is a radial dimension of the guide part 61 at the first end thereof in the first direction, and the first end of the guide part 61 is an end of the guide part 61 away from the electrode assembly 22 in the second direction. d4 is a radial dimension of the first end of the protrusion 50 in the first direction, and the first end of the protrusion 50 is an end of the protrusion 50 adjacent to the electrode assembly 22 in the second direction. W0 is the distance between the inner surfaces of the housing 210 in the first direction. W1 is the dimension of the tab holder 23 in the first direction. f (W0-W1) is a positive correlation function of W0-W1.

Optionally, D0 is the caliber or maximum dimension at the first end of the guide 61 in the first direction; d4 is the largest dimension of the first end of the projection 50 in the first direction.

The inner surface of the case 210 is a surface of the case 210 facing the electrode assembly 22, and a distance between the inner surfaces of the case 210 in the first direction may be a maximum distance between the inner surfaces of the case 210 in the first direction.

f (W0-W1) is a positive correlation function of W0-W1, i.e., the value of f (W0-W1) is positively correlated with the magnitude of W0-W1.

Alternatively, the distance between the outer surfaces of the housing 210 in the first direction is the same as the size of the first end cap 211.

Alternatively, the size of the electrode assembly 22 is the same as that of the tab holder 23 in the first direction.

In this embodiment, by providing the dimensions of the protrusion 50, the guide 61, the housing 210 and the tab support 23, the dimension of the guide 61 in the first direction can be ensured to be large enough to facilitate the engagement of the protrusion 50 with the opening structure 60 when the tab support 23 and the first end cap 211 are offset relative to each other in the first direction.

In an embodiment of the present application, f (W0-W1) = a × (W0-W1), and a is 0.4 to 1.

Fig. 11 is an enlarged schematic view of a region B in fig. 10. As shown in fig. 11, a first separator 24 is disposed between the tab holder 23 and the case 210 in the first direction. Therefore, the difference between the distance between the inner walls of the case 210 and the size of the tab holder 23 in the first direction is greater than the length value of the gap between the tab holder 23 and the inner wall of the case 210 in practice. Thus, the value of a may be less than 1.

Optionally, due to the requirement of the assembly process and the like, a structural adhesive is further disposed between the tab support 23 and the housing 210, and in fact, the length of the gap between the tab support 23 and the housing 210 in the first direction is smaller, and the value of a may be set to be greater than 0.4 and less than 1, so as to balance errors caused by the assembly process and the like.

In this embodiment, by setting f (W0-W1) = a × (W0-W1), a is 0.4 to 1, which facilitates flexible setting of the size of D0-D4 according to specific needs.

Alternatively, a is 0.5 to 0.6, the dimensions of the guide portion 61 and the projection 50 can be made in a more reasonable range, facilitating the processing and assembly of the guide portion 61 and the projection 50.

In one embodiment, a is 1 and D0-D4. Gtoreq.W 0-W1. For example, after the electrode assembly 22 is placed in the case 210, one end of the tab holder 23 in the x-direction is closely attached to the case 210, and the gap between the other end of the tab holder 23 in the x-direction and the case 210 has a size W0-W1 in the first direction. In the process of clamping the opening structure 60 of the tab holder 23 with the projection 50 of the first end cap 211, the difference between the dimension of the guide 61 at the first end and the dimension of the projection 50 at the first end in the first direction, D0-D4, is greater than or equal to W0-W1, at this time, it can still be ensured that the projection 50 is clamped into the opening structure 60, so that the connection between the first end cap 211 and the tab holder 23 can be ensured.

Alternatively, the gap between the tab holder 23 and the inner surface of the case 210 in the first direction is x1, and the value of x1 may be less than or equal to W0-W1. For example, x1 is smaller than W0-W1 due to the presence of structural adhesive or the like of the first separator 24 and the outer surface of the tab holder 23. That is, x1= a × (W0-W1).

In one embodiment, the opening structure 60 includes a clamping groove portion 62, and the clamping groove portion 62 is connected with one end of the guide portion 61 close to the electrode assembly 22 along the second direction, and the protrusion portion 50 is clamped with the clamping groove portion 62.

The bayonet part 62 is disposed at a first end of the opening structure 60, which is an end of the opening structure 60 near the electrode assembly 22 in the second direction.

The slot portion 62 is connected to and communicated with the guide portion 61 along the second direction, and under the action of the guide structure 61, the protrusion portion 50 can be clamped into the slot portion 62 along the guide portion 61 and clamped with the slot portion 62. In this way, after the protruding portion 50 is engaged with the engaging groove portion 62, the protruding portion 50 and the opening structure 60 are fixed in position in the second direction, that is, the protruding portion 50 and the opening structure 60 are limited in position in the second direction.

In one embodiment, the card slot portion 62 includes a position-limiting portion 621 and a receiving portion 622, the receiving portion 622 is close to the electrode assembly 22 relative to the position-limiting portion 621, a radial dimension of the position-limiting portion 621 is smaller than a radial dimension of the receiving portion 622, and the position-limiting portion 621 and the receiving portion 622 form a step structure.

The position limiting part 621 and the receiving part 622 are connected and communicated in the second direction, the receiving part 622 is adjacent to the electrode assembly with respect to the position limiting part 621, and a radial dimension of the position limiting part 621 is smaller than that of the receiving part 622, and the position limiting part 621 and the receiving part 622 form a stepped structure. In this way, after the protruding portion 50 enters the bayonet portion 62, the protruding portion 50 can be partially received in the receiving portion 622, and the stopper portion 621 can restrict the movement of the protruding portion 50 in the second direction to prevent the protruding portion 50 from coming out of the receiving portion 622.

In one embodiment, the protrusion 50 includes a body portion 51 and a catch 52, the catch 52 being close to the electrode assembly 22 with respect to the body portion 51, the catch 52 including a snap portion 522 and a connection portion 521, the snap portion 522 being connected with the body portion 51 through the connection portion 521; the radial dimension of the clamping portion 522 is greater than that of the connecting portion 521, and the clamping portion 522 is clamped with the clamping groove portion 62.

The catch 52 is disposed at a first end of the protrusion 50, wherein the first end of the protrusion 50 is an end of the protrusion 50 near the electrode assembly 22 in the second direction.

In this embodiment, the clamping portion 522 can be clamped into the clamping groove portion 62, for example, after the clamping portion 522 enters the accommodating portion 622, under the action of the limiting portion 621, the clamping portion 522 is limited in the second direction.

In an embodiment, the latch 52 is provided with a deformation groove 53, the deformation groove 53 extends from an end of the latch 52 near the electrode assembly 22 toward the first end cap 211 in the second direction, and the deformation groove 53 is configured to be deformed when the snap portion 522 enters the snap portion 62, so that the snap portion 522 is snapped into the snap portion 62.

In this embodiment, the latch 52 is provided with a deformation groove 53, so that when the latch 52 passes through the limiting portion 621, the size of the latch 52 in the first direction can be reduced, so that the latch 52 can enter the accommodating portion 622, and the latch 52 is engaged with the latch portion 62.

In one embodiment, the guiding portion 61, the catch 52 and the deformation groove 53 satisfy: d3 > D3 > D3-s0. Wherein d3 is a radial dimension of the first end of the fastening portion 522 along the first direction, and the first end of the fastening portion 522 is an end of the fastening portion 522 away from the electrode assembly 22 along the second direction; d3 is a radial dimension of the second end of the guide part 61 in the first direction, and the second end of the guide part 61 is an end of the guide part 61 close to the electrode assembly 22 in the second direction; s0 is a distance between two opposing groove wall surfaces of the deformed groove 53.

Alternatively, D3 is the maximum dimension of the first end of the snap-in portion 522 along the first direction, D3 is the caliber or the maximum dimension of the second end of the guide portion 61 along the first direction, and s0 is the maximum dimension of the deformation groove 53 along the first direction.

Alternatively, s0 is the maximum distance between two groove wall surfaces of the deformed groove 53 that are oppositely disposed in the first direction.

In this embodiment, the radial dimension of the limiting portion 621 is the same as the dimension of the second end of the guiding portion 61 along the first direction, and D3 is greater than D3, so that after the buckle 52 is clamped into the clamping groove portion 62, the buckle 52 cannot be disengaged from the clamping groove portion 62; d3 is greater than D3-s0, so as to ensure that the buckle 52 can enter the accommodating portion 622 of the clamping groove portion 62 via the limiting portion 621 after the deformation groove 53 is deformed.

Optionally, the radial dimension D4 of the accommodating portion 622 is larger than the dimension D3 of the first end of the clamping portion 522 along the first direction, so that the clamping portion 522 can be accommodated in the accommodating portion 622 without deformation.

In one embodiment, the catch 52 and the guide 61 satisfy: D3-D3 is greater than 0.5mm. In this way, a sufficient overlapping area of the catch 52 and the notch portion 62 in the first direction can be ensured, so that the catch 52 is not easily detached from the notch portion 62.

In one embodiment, the guiding portion 61, the catch 52 and the deformation groove 53 satisfy: D3-D3+ s0 is greater than 0.2mm. Thus, the situation that the buckle 52 is not easily inserted into the groove 62 due to the over-small radial dimension of the stopper 621 can be avoided, which is beneficial to the insertion of the buckle 52 into the groove 62.

In an embodiment, the angle q between the guide 61 and the second direction is smaller than 45 °. This facilitates the guide portion 61 guiding the projection 50 to snap into the opening structure 60.

In an embodiment, the main body 51 is provided with a first fixing portion 511 and a transition portion 512, the radial dimension of the first fixing portion 511 is greater than that of the transition portion 512, and the first fixing portion 511 is connected with the buckle 52 through the transition portion 512; the opening structure 60 includes a second fixing portion 63, the second fixing portion 63 communicating with the guide portion 61 and being apart from the electrode assembly 22 with respect to the guide portion 61, and the first fixing portion 511 abutting against the second fixing portion 63.

In this embodiment, the first fixing portion 511 abuts against the second fixing portion 63, and the first fixing portion 511 and the second fixing portion 63 are limited in the first direction. Since the first fixing portion 511 and the second fixing portion 63 are abutted after the snap 52 is snapped into the snap groove portion 62, the protruding structure 50 and the opening structure 60, that is, the first end cap 211 and the tab holder 23, can be limited and fixed in the first direction and the second direction. Like this, through spacing first end cover 211 and utmost point ear support 23 in first direction and second direction, be favorable to strengthening the joint strength between first end cover 211 and the utmost point ear support 23.

Alternatively, the first fixing portion 511 and the second fixing portion 63 have the same size along the first direction.

Optionally, the radial dimension of the transition portion 512 is gradually reduced along the second direction or the radial dimension of the transition portion 512 is the same as the radial dimension of the connecting portion 521. The transition portion 512 is not particularly limited in shape or arrangement as long as it can connect the first fixing portion 511 and the clip 52.

In an embodiment, a dimension of the first fixing portion 511 and/or the second fixing portion 63 in the second direction is greater than 0.8mm. Thus, the connection strength between the first fixing portion 511 and the second fixing portion 63 is facilitated to be enhanced.

Alternatively, a dimension h1 of the first fixing portion 511 in the second direction and a dimension h2 of the second fixing portion 63 in the second direction are the same.

In one embodiment, the dimension of the first latch structure 2111 is smaller than the dimension of the second latch structure 231 along the second direction, which is the thickness direction of the first end cap 211. That is, the dimension of the projection 50 in the second direction is smaller than the dimension of the opening structure 60 in the second direction, which facilitates reducing wear between the projection 50 and the opening structure 60 when the opening structure 60 is a groove; when the opening structure 60 is a through-hole penetrating the tab holder 23, it is possible to prevent the electrode assembly 22 from being damaged by the protrusion 50 protruding from the opening structure 60.

In one embodiment, first and second snap features 2111 and 231 are circular in cross-section. The cross-section is perpendicular to the second direction, that is, the cross-section is parallel to the first end cap 211. Thus, the first clamping structure 2111 and the second clamping structure 231 can be assembled and limited in the x direction and the y direction.

Optionally, first and

second snap structures

2111 and 231 comprise solid of revolution structures. For example, when the second latch structure 231 is the open structure 60, the latch portion 62 and the second fixing portion 63 in the open structure 60 are both cylindrical rotary structures, and the guide portion 61 is a truncated cone-shaped rotary structure. For example, when the first engaging structure 2111 is the protruding portion 50, the first fixing portion 511 may be a cylindrical rotator structure, the transition portion 512 may be a truncated cone-shaped rotator structure, the connecting portion 521 may be a cylindrical rotator structure having a groove in the middle, and the engaging portion 522 may be a truncated cone-shaped rotator structure.

In one embodiment, the tab holder 23 is provided with a groove 601 extending in a first direction, and the tab 221 is configured to be connected with the electrode terminal 211a of the first end cap 211 through the groove 601.

The tab 221 of the electrode assembly 22 is connected to the electrode terminal 211a of the first end cap 211 through the tab holder 23. For example, the tab holder 23 is provided with a groove 601 extending in a first direction, and after the tab 221 passes through the groove 601, one end of the tab 221 close to the electrode assembly 22 is attached to the tab holder 23, and one end of the tab 221 remote from the electrode assembly 22 is connected to the electrode terminal 211a. In this way, the tab holder 23 separates the tab 221 from the portion of the electrode assembly 22 not including the tab 221, and it is possible to prevent the tab 221 from being inserted into the electrode assembly 22 to cause a short circuit.

In an embodiment, the first end cap 211 further includes an insulating member 2112 and an end cap plate 2113, the insulating member 2112 is used for isolating the end cap plate 2113 from the electrode assembly 22, and the insulating member 2112 and the first clamping structure 2111 are integrally formed. The insulating member 2112 serves to electrically insulate the end cap plate 2113 from the body portion 222 of the electrode assembly 22, so that a short circuit can be prevented, and in addition, the insulating member 2112 and the first clamping structure 2111 are integrally formed, which facilitates processing.

The end cap sheet 2113 may be made of metal and may be conductive, and the end cap sheet is provided with the electrode terminal 211a. In addition, an insulator 2112 is provided between the end cap sheet and the body portion 222 of the electrode assembly 22 for achieving electrical insulation of the end cap sheet from the body portion 222.

The first and second clamping structures 2111 and 213 may be made of an electrically insulating material to ensure electrical insulation between the body portion 222 and the end cap sheet 2113 of the electrode assembly 22.

In an embodiment, the first end cap 211 is provided with a plurality of first clamping structures 2111, and the tab holder 23 is provided with a plurality of second clamping structures 231 corresponding to the plurality of first clamping structures 2111. This may help to increase the security of the connection between first catch structure 2111 and second catch structure 231.

Optionally, the first end cap 211 is provided with two first clamping structures 2111, and the two first clamping structures 2111 are respectively located at two ends of the first end cap 211 in the first direction; correspondingly, the tab holder 23 is provided with two second clamping structures 231.

The application provides a battery cell 20, and battery cell 20 includes first end cap 211 and utmost point ear support 23. The tab holder 23 is provided with an opening structure 60, and the opening structure 60 includes a second fixing portion 63, a guide portion 61 and a clamping groove portion 62 which are sequentially communicated along the second direction. The first end cap 211 is provided with a protrusion 50 protruding toward the electrode assembly 22, and the protrusion 50 is sequentially provided with a first fixing portion 511, a transition portion 512, and a catch 52 along a second direction, wherein the first direction is parallel to the first end cap 211 and the second direction is a thickness direction of the first end cap 211. When the first end cover 211 and the tab support 23 relatively deviate in the first direction, the buckle 52 can be clamped into the clamping groove part 62 under the action of the guide part 61, and the first fixing part 511 is abutted to the second fixing part 63, so that the connection between the first end cover 211 and the tab support 23 and the fixation and limitation in the first direction and the second direction are realized.

The present application provides a battery 10 including a battery cell 20 as described in any of the above embodiments, and a case 11 for accommodating the battery cell 20 in the case 11.

The embodiment of the application provides an electric device, which comprises the battery 10 of the above embodiment, and the battery 10 is used for supplying power to the electric device.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein, but rather to cover all embodiments falling within the scope of the appended claims.

Claims

1. A battery cell, comprising:

an electrode assembly (22) including a body portion (222) and tabs (221) extending from the body portion (222);

a case (210) for accommodating the electrode assembly (22), the case (210) having a first opening (210 a);

a first end cap (211) for covering the first opening (210 a);

a tab holder (23) located between the first end cap (211) and the body portion (222), the tab holder (23) for supporting the tab (221);

first end cover (211) are provided with first joint structure (2111), utmost point ear support (23) are provided with second joint structure (231), first joint structure (2111) with second joint structure (231) are configured into, and the two can joint each other when relative distance on the first direction belongs to the predetermined range, in order to restrict first end cover (211) with the relative movement of utmost point ear support (23), the first direction is on a parallel with first end cover (211).

2. The battery cell according to claim 1, wherein the first clamping structure (2111) is a protrusion (50) protruding toward the electrode assembly (22) in a second direction, the second clamping structure (231) is an opening structure (60) corresponding to the protrusion (50), and the second direction is a thickness direction of the first end cap (211).

3. The battery cell according to claim 2, wherein the opening structure (60) comprises a guide part (61) along a second direction and pointing to the electrode assembly (22), the radial dimension of the guide part (61) gradually decreases, the guide part (61) is used for guiding the protrusion part (50) to be clamped into the opening structure (60), and the second direction is the thickness direction of the first end cap (211).

4. The battery cell according to claim 3, wherein the protrusion (50), the guide (61), the case (210), and the tab holder (23) satisfy: D0-D4 is more than or equal to f (W0-W1);

wherein D0 is a radial dimension at a first end of the guide portion (61) along the first direction, the first end of the guide portion (61) being an end of the guide portion (61) away from the electrode assembly (22) along the second direction; d4 is a radial dimension of a first end of the projection (50) along the first direction, the first end of the projection (50) being an end of the projection (50) that is closer to the electrode assembly (22) along the second direction; w0 is a distance between inner surfaces of the housing (210) along the first direction; w1 is the size of the tab support (23) along the first direction; f (W0-W1) is a positive correlation function of W0-W1.

5. The battery cell according to claim 4, wherein f (W0-W1) = a × (W0-W1), and a is 0.4 to 1.

6. The battery cell according to any one of claims 3 to 5, wherein the opening structure (60) includes a clamping groove portion (62), the clamping groove portion (62) is connected with one end of the guide portion (61) close to the electrode assembly (22) along the second direction, and the protruding portion (50) is clamped with the clamping groove portion (62).

7. The battery cell according to claim 6, wherein the clamping groove portion (62) comprises a limiting portion (621) and a receiving portion (622), the receiving portion (622) is close to the electrode assembly (22) relative to the limiting portion (621), the radial dimension of the limiting portion (621) is smaller than that of the receiving portion (622), and the limiting portion (621) and the receiving portion (622) form a step structure.

8. The battery cell according to claim 6, wherein the protrusion (50) comprises a main body portion (51) and a catch (52), the catch (52) being adjacent to the electrode assembly (22) relative to the main body portion (51), the catch (52) comprising a snap-in portion (522) and a connecting portion (521), the snap-in portion (522) being connected to the main body portion (51) through the connecting portion (521);

the radial dimension of the clamping portion (522) is larger than that of the connecting portion (521), and the clamping portion (522) is clamped with the clamping groove portion (62).

9. The battery cell according to claim 8, wherein the buckle (52) is provided with a deformation groove (53), the deformation groove (53) extending from an end of the buckle (52) close to the electrode assembly (22) toward the first end cap (211) in the second direction, the deformation groove (53) being configured to be deformable when the clamping portion (522) enters the clamping groove portion (62) so that the clamping portion (522) is clamped into the clamping groove portion (62).

10. The battery cell according to claim 9, characterized in that the guide portion (61), the catch (52) and the deformation groove (53) satisfy: d3 > D3 > D3-s0;

wherein d3 is a radial dimension of the first end of the clamping portion (522) along the first direction, and the first end of the clamping portion (522) is an end of the clamping portion (522) away from the electrode assembly (22) along the second direction; d3 is the radial dimension of the second end of the guide part (61) along the first direction, and the second end of the guide part (61) is the end of the guide part (61) close to the electrode assembly (22) along the second direction; s0 is a distance between two opposing groove wall surfaces of the deformation groove (53).

11. The battery cell according to claim 10, characterized in that the catch (52) and the guide (61) satisfy: D3-D3 is more than 0.5mm.

12. The battery cell according to claim 10, characterized in that the guide portion (61), the catch (52) and the deformation groove (53) satisfy: D3-D3+ s0 is more than 0.2mm.

13. A battery cell according to any of claims 3 to 5, characterised in that the angle between the guide portion (61) and the second direction is less than 45 °.

14. The battery cell according to claim 8, characterized in that the main body portion (51) is provided with a first fixing portion (511) and a transition portion (512), the radial dimension of the first fixing portion (511) being greater than the radial dimension of the transition portion (512), the first fixing portion (511) being connected with the snap (52) through the transition portion (512);

the opening structure (60) includes a second fixing portion (63), the second fixing portion (63) communicating with the guide portion (61) and being away from the electrode assembly (22) with respect to the guide portion (61), the first fixing portion (511) abutting against the second fixing portion (63).

15. The battery cell according to claim 14, characterized in that the dimension of the first fixing portion (511) and/or the second fixing portion (63) in the second direction is larger than 0.8mm.

16. The battery cell according to any of claims 1-5, characterized in that the first clamping structure (2111) has a smaller dimension than the second clamping structure (231) in a second direction, which is the thickness direction of the first end cap (211).

17. The battery cell according to any of claims 1-5, characterized in that the first and second snap-in structures (2111, 231) are circular in cross-section.

18. The battery cell according to any one of claims 1 to 5, wherein the tab holder (23) is provided with a groove (601) extending in a first direction, and the tab (221) is configured to be connected with the electrode terminal (211 a) of the first end cap (211) through the groove (601).

19. The battery cell according to any one of claims 1 to 5, wherein the first end cap (211) further comprises an end cap sheet (2113) and an insulator (2112), the insulator (2112) being used for isolating the end cap sheet (2113) and the electrode assembly (22), the insulator (2112) being an integral structure with the first clamping structure (2111).

20. The battery cell according to any one of claims 1 to 5, wherein the first end cap (211) is provided with a plurality of first clamping structures (2111), and the tab holder (23) is provided with a plurality of second clamping structures (231) corresponding to the plurality of first clamping structures (2111).

21. A battery, comprising:

a battery cell according to any one of claims 1 to 20;

a case (11), wherein the case (11) is used for accommodating the battery cells.

22. An electrical consumer comprising the battery of claim 21, the battery configured to provide power to the electrical consumer.