CN221126190U - Battery monomer, battery and electric equipment - Google Patents

Abstract

The application relates to a battery monomer, a battery and electric equipment, wherein the battery monomer comprises a shell, an electrode assembly and a conductive structure, the shell is provided with an electrode part, and the electrode assembly is accommodated in the shell; the conductive structure is accommodated in the shell; the conductive structure comprises a current collector and a conductive piece, the conductive piece is fixed on the inner side of the shell and is electrically connected with the electrode part, the current collector is electrically connected with the electrode assembly, the conductive piece is pressed to be elastically deformed, and when the end cover and the shell cover, the conductive piece is abutted with the current collector, and a circuit between the conductive piece and the current collector is conducted. A battery comprises the battery cell. An electric device comprises the battery. According to the battery monomer, the battery and the electric equipment, only the current collector is required to be in contact with the conductive piece, electric connection between the electrode part and the electrode assembly can be achieved without welding, the condition that the battery monomer is affected due to welding slag, temperature rise and the like is improved, and improvement of performance stability and reliability of the battery monomer is facilitated.

Description

Battery monomer, battery and electric equipment

Technical Field

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

Background

With popularization and promotion of new energy automobiles, charge and discharge performance, cruising ability and the like of the new energy automobiles are increasingly attracting attention and importance.

In the battery cell, the tab of the electrode assembly and the electrode guide post need to be electrically connected to provide a current path for charging and discharging the battery cell. In the prior art, the electrode lugs of the electrode assembly are connected with the electrode guide columns in a welding mode, and welding slag splashing or poor cold welding easily occurs during welding, so that the performance stability of the battery cell can be influenced.

Disclosure of utility model

Based on this, it is necessary to provide a battery cell, a battery and electric equipment for the problem that the welding of the electrode assembly and the electrode guiding column affects the performance stability of the battery cell.

A battery cell comprises a shell, an electrode assembly and a conductive structure, wherein the shell is provided with an electrode part, and the electrode assembly is accommodated in the shell; the conductive structure is accommodated in the shell; the conductive structure comprises a current collector and a conductive piece, wherein the conductive piece is fixed on the inner side of the shell and is electrically connected with the electrode part, and the current collector is electrically connected with the electrode assembly; the conductive piece is pressed to elastically deform, the shell comprises a shell body and an end cover, and when the end cover is covered with the shell body, the conductive piece is abutted with the current collector, and a circuit is conducted between the conductive piece and the current collector.

According to the battery cell, the current collector is electrically connected with the electrode assembly, the conductive piece is fixed on the inner side of the shell and is electrically connected with the electrode part, the current collector is only required to be in contact with the conductive piece, the electrode part and the electrode assembly can be electrically connected without welding, the condition that the battery cell is influenced by welding slag, temperature rise and the like due to welding is improved, and the performance stability and reliability of the battery cell are improved; the conductive piece is pressed and can elastically deform, and when the end cover and the shell cover, the conductive piece can be self-adaptive to the installation space between the end cover and the shell.

In some of these embodiments, the conductive member is disposed on a side of the end cap facing the electrode assembly, and the current collector is disposed on a side of the electrode assembly facing the end cap, and when the end cap is covered with the case, the conductive member abuts against the current collector and presses against the electrode assembly. Therefore, the electrode assembly can be pressed through the conductive piece, so that the electrode assembly is fixed in an auxiliary pressing mode, and the performance stability and reliability of the battery cell are improved.

In some of these embodiments, the case has an opening, the end cap is detachably provided to the opening, and the electrode terminal is provided at a side of the end cap facing away from the electrode assembly. Therefore, the end cover is covered or separated from the shell, so that the assembly and disassembly are convenient, and the assembly efficiency and the production rate of the battery monomer are improved.

In some embodiments, the projected area of the conductive member is smaller than the projected area of the end cap in a first direction, the first direction being a thickness direction of the end cap. Thus, when the end cover is covered with the shell, the conductive member can be completely contained in the shell, and the conductive member is not prevented from contacting with the current collector.

In some embodiments, the ratio of the projected area of the conductive member to the projected area of the end cover in the first direction is in a range of 0.3-0.5. Therefore, the ratio range of the projection area of the conductive member to the projection area of the end cover in the first direction is limited, so that the conductive member can be completely contained in the shell, and meanwhile, the overcurrent area of the conductive member is maximized.

In some of these embodiments, the projected area of the conductive member is smaller than the projected area of the current collector in the first direction. Thus, when the end cover is covered with the case, the conductive member can be sufficiently abutted against the current collector.

In some embodiments, in the first direction, a ratio of a projection area of the conductive member to a projection area of the current collector ranges from 0.6 to 0.9. In this way, the ratio range of the projection area of the conductive member to the projection area of the current collector in the first direction is limited, so that the conductive member is fully abutted against the current collector, and meanwhile, the overcurrent area of the conductive member is maximized.

In some embodiments, the electrode part comprises a first electrode part and a second electrode part with opposite polarities, the first electrode part is arranged on the shell, the second electrode part is arranged on the end cover, and the electrode assembly comprises a first tab and a second tab with opposite polarities; the first electrode lug is electrically connected with the first current collector, and a first conductive piece is arranged on one side of the shell, which is away from the first electrode part, and is used for being electrically connected with the first current collector; the second electrode lug is electrically connected with the second current collector, and one side of the end cover, which is away from the second electrode part, is provided with a second conductive piece which is used for being electrically connected with the second current collector. Thus, when the end cover and the shell are covered, the electrode lugs can be electrically connected with the corresponding electrode parts.

In some embodiments, the first electrode portion is an electrode terminal protruding from the case, and the second electrode portion is a conductive planar region provided on a side of the end cap facing the electrode assembly. Thus, the electrode parts with opposite polarities can be smoothly arranged on the shell, and the whole volume of the battery cell is reduced.

In some of these embodiments, the conductive member is a block structure. Thus, when the end cover and the shell cover, the conductive piece is in a compressed state, the conductive piece can be abutted with the current collector, and meanwhile, the electrode assembly is convenient to compress and fix in an auxiliary mode.

In some of these embodiments, the conductive member is conductive foam. Thus, the conductive member can have conductivity and be elastically deformed by pressure.

In some embodiments, the compression of the conductive foam is in the range of 50% -80%. Therefore, on the basis that the conductive foam has conductivity, the compression deformation of the conductive foam is optimized, and the service life of the conductive foam is prolonged.

A battery comprises the battery cell. According to the battery, the current collector is electrically connected with the electrode lug of the electrode assembly, the conductive piece is fixed on the inner side of the shell and is electrically connected with the electrode part, the current collector is only required to be in contact with the conductive piece, the electric connection between the electrode part and the electrode assembly can be realized without welding, the conditions that welding slag, temperature rise and the like are generated due to welding are improved, and the performance stability and reliability of the battery are improved.

An electric device comprises the battery. According to the electric equipment, the battery can realize the electric connection between the electrode part and the electrode assembly without welding, the situation that welding slag, temperature rise and the like are generated due to welding and influence on the battery cells is improved, and the performance stability and reliability of the battery cells are improved.

Drawings

Fig. 1 is a schematic diagram of an electric device according to some embodiments of the present application.

Fig. 2 is an exploded view of a battery according to some embodiments of the present application.

Fig. 3 is a schematic view of a battery cell according to some embodiments of the present application.

Fig. 4 is a cross-sectional view of the battery cell shown in fig. 3.

Fig. 5 is an exploded view of the battery cell shown in fig. 3.

Fig. 6 is a schematic diagram of a conductive member in a battery cell according to some embodiments of the present application.

Fig. 7 is a schematic view of a conductive member according to another embodiment of the present application.

Reference numerals:

10. A vehicle; 11. a controller; 12. a motor; 20. a battery; 21. a case; 22. a battery cell; 21a, a first portion; 21b, a second part;

100. A housing; 101. an electrode section; 101a, a first electrode portion; 101b, a second electrode portion; 110. a housing; 111. an opening; 120. an end cap; 300. an electrode assembly; 400. a conductive structure; 410. a current collector; 411. a first current collector; 412. a second current collector; 420. a conductive member; 421. a first conductive member; 422. and a second conductive member.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

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

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical 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. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

With popularization and promotion of new energy automobiles, charge and discharge performance, cruising ability and the like of the new energy automobiles are increasingly attracting attention and importance.

In the battery cell, the tab of the electrode assembly and the electrode guide post need to be electrically connected to provide a current path for charging and discharging the battery cell. In the prior art, the electrode lugs of the electrode assembly are connected with the electrode guide columns in a welding mode, and welding slag splashing or poor cold welding easily occurs during welding, so that the performance stability of the battery cell can be influenced.

Based on the above consideration, the application designs a battery monomer, a battery and electric equipment, wherein in the battery monomer, a current collector is electrically connected with an electrode assembly, a conductive piece is fixed on the inner side of a shell and is electrically connected with an electrode part, the electric connection between the electrode part and the electrode assembly can be realized only by contacting the current collector with the conductive piece without welding, the conditions that the battery monomer is influenced by welding slag, temperature rise and the like caused by welding are improved, and the performance stability and reliability of the battery monomer are improved.

The embodiment of the application provides electric equipment using a battery as a power supply, wherein the electric equipment can be, but is not limited to, a mobile phone, a tablet personal computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take a powered device according to an embodiment of the present application as an example of the vehicle 10.

Referring to fig. 1, fig. 1 is a schematic diagram of a vehicle 10 according to some embodiments of the application. The vehicle 10 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 vehicle or a range-extended vehicle. The interior of the vehicle 10 is provided with a battery 20, and the battery 20 may be provided at the bottom or at the head or at the tail of the vehicle 10. The battery 20 may be used to power the vehicle 10, for example, the battery 20 may be used as an operating power source for the vehicle 10. The vehicle 10 may also include a controller 11 and a motor 12, the controller 11 being configured to control the battery 20 to power the motor 12, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 10. In other embodiments of the present application, the battery 20 may be used not only as an operating power source for the vehicle 10, but also as a driving power source for the vehicle 10, instead of or in part instead of fuel oil or natural gas, to provide driving force for the vehicle 10.

Referring to fig. 2, fig. 2 is an exploded view of a battery 20 according to some embodiments of the present application. The battery 20 includes a case 21 and a battery cell 22, and the battery cell 22 is accommodated in the case 21. The case 21 is used to provide an accommodating space for the battery cell 22, and the case 21 may have various structures. In some embodiments, the case 21 may include a first portion 21a and a second portion 21b, the first portion 21a and the second portion 21b being overlapped with each other, the first portion 21a and the second portion 21b together defining an accommodating space for accommodating the battery cell 22. The second portion 21b may be a hollow structure with one end opened, the first portion 21a may be a plate-shaped structure, and the first portion 21a covers the opening side of the second portion 21b, so that the first portion 21a and the second portion 21b together define an accommodating space; the first portion 21a and the second portion 21b may be hollow structures each having an opening at one side, and the opening side of the first portion 21a is engaged with the opening side of the second portion 21 b. Of course, the case 21 formed by the first portion 21a and the second portion 21b may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 20, the plurality of battery cells 22 may be plural, and the plurality of battery cells 22 may be connected in series, parallel, or a series-parallel connection, where a series-parallel connection refers to that the plurality of battery cells 22 are connected in both series and parallel. The plurality of battery cells 22 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 22 is accommodated in the box body 21; of course, the battery 20 may also be a battery module formed by connecting a plurality of battery cells 22 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 21.

Wherein each battery cell 22 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 22 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, and the embodiment of the present application is not limited thereto.

Referring to fig. 3 and 4, the battery cell 22 in an embodiment includes a housing 100, an electrode assembly 300 and a conductive structure 400, wherein the housing 100 is provided with an electrode portion 101, the electrode assembly 300 is accommodated in the housing 100, and the conductive structure 400 is accommodated in the housing 100; the conductive structure 400 includes a current collector 410 and a conductive member 420, the conductive member 420 is fixed on the inner side of the housing 100 and is electrically connected with the electrode portion 101, the current collector 410 is electrically connected with the electrode assembly 300, the conductive member 420 can be elastically deformed under compression, the housing 100 includes a shell 110 and an end cover 120, and when the end cover 120 is covered with the shell 110, the conductive member 420 is abutted to the current collector 410 and conducts a circuit between the two.

It should be noted that, when the end cap 120 is covered with the housing 110, the conductive member 420 abuts against the current collector 410 and the circuit therebetween is conducted; when the end cap 120 is separated from the case 110, the conductive member 420 can be separated from the current collector 410 or taken out separately, thereby facilitating maintenance and replacement of the conductive member 420 and the current collector 410. In an embodiment of the present application, the case 100 is configured as a member for providing a receiving chamber that may be used to receive the electrode assembly 300, the electrolyte, and other members.

In the embodiment of the present application, the electrode part 101 is configured as a member for electrically connecting with the electrode assembly 300 to output or input the electric power of the battery cell 22.

In an embodiment of the present application, the electrode assembly 300 is a component of the battery cell 22 where an electrochemical reaction occurs, and one or more electrode assemblies 300 may be contained within the case 100. The electrode assembly 300 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet, portions of the positive electrode sheet and the negative electrode sheet having active materials constitute a main body portion of the electrode assembly 300, portions of the positive electrode sheet and the negative electrode sheet having no active materials constitute tabs, respectively, and the positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During charge and discharge of the battery 20, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs of the electrode assembly 300 are electrically connected to the electrode part 101 to form a current loop.

In the embodiment of the present application, the conductive structure 400 is configured as a structure for electrically connecting the electrode part 101 with the electrode assembly 300. The current collector 410 and the conductive member 420 have conductivity, the current collector 410 is fixed to the tab of the electrode assembly 300 by welding, and the conductive member 420 is fixed to the side of the case 100 facing the electrode assembly 300 by gluing. Preferably, the current collector 410 has a sheet-like structure and the conductive member 420 has a block-like structure.

In the above-mentioned battery cell 22, the current collector 410 is electrically connected with the tab of the electrode assembly 300, the conductive member 420 is fixed on the inner side of the housing 100 and is electrically connected with the electrode portion 101, and the electrical connection between the electrode portion 101 and the electrode assembly 300 can be achieved only by contacting the current collector 410 with the conductive member 420 without welding, so that the conditions that the battery cell 22 is affected due to welding slag, temperature rise, etc. generated by welding are improved, and the performance stability and reliability of the battery cell 22 are improved; the conductive member 420 is elastically deformed by being pressed, and the conductive member 420 can be adapted to the installation space between the end cap 120 and the housing 110 when the end cap 120 is closed with the housing 110.

Referring to fig. 4 and 5, according to some embodiments of the present application, the conductive member 420 is disposed on a side of the end cap 120 facing the electrode assembly 300, the current collector 410 is disposed on a side of the electrode assembly 300 facing the end cap 120, and when the end cap 120 is covered with the case 110, the conductive member 420 abuts against the current collector 410 and presses the electrode assembly 300.

It should be noted that, when the end cap 120 is covered with the case 110, the conductive member 420 abuts against the current collector 410 and presses the electrode assembly 300, and at this time, the circuit between the conductive member 420 and the current collector 410 is conducted, and the electrode assembly 300 can be pressed by the conductive member 420; when the end cap 120 is separated from the case 110, the conductive member 420 can be separated from the current collector 410 or taken out separately, thereby facilitating maintenance and replacement of the conductive member 420 and the current collector 410.

In the embodiment of the present application, the conductive member 420 is fixed to the side of the end cap 120 facing the electrode assembly 300, wherein the conductive member 420 is fixed to the end cap 120 by a back adhesive such as a double sided adhesive tape. Through the above arrangement, the electrode assembly 300 can be pressed by the conductive member 420, thereby assisting in fixing the electrode assembly 300, which is advantageous in improving the performance stability and reliability of the battery cell 22.

According to some embodiments of the present application, referring to fig. 4, the case 110 has an opening 111, and the end cap 120 is detachably disposed at the opening 111, and the electrode portion 101 is disposed at a side of the end cap 120 facing away from the electrode assembly 300.

In an embodiment of the present application, the case 110 is an assembly for cooperating with the end cap 120 to form an internal environment that may be used to house the electrode assembly 300, electrolyte, and other components. Wherein, the opening 111 is disposed at least one end of the housing 110, it can be understood that: one end of the housing 110 has an opening 111, or both ends of the housing 110 have openings 111 and end caps 120 are provided at each opening 111.

In the embodiment of the present application, the end cap 120 refers to a member that is covered at the opening 111 of the housing 110 to isolate the internal environment from the external environment. The end cap 120 is detachably disposed at the opening 111, that is, the end cap 120 may be detachably disposed at the opening 111 by screwing, clamping, plugging, or other manners. Here, the materials of the case 110 and the end cap 120 may be the same or different; for example, the housing 110 may be made of a metal or nonmetal material such as steel or aluminum, and the end cap 120 may be made of a metal or nonmetal material such as steel or aluminum.

Through the arrangement, the end cover 120 is covered or separated from the shell 110, so that the assembly and disassembly are convenient, and the assembly efficiency and the production rate of the battery cells 22 are improved.

Referring to fig. 5 and 3, in a first direction, a projection area of the conductive member 420 is smaller than a projection area of the end cap 120, and the first direction is a thickness direction of the end cap 120.

The first direction is the Z direction shown in fig. 5 and 3, that is, the thickness direction of the end cap 120. The projected area of the conductive member 420 in the first direction, that is, the area projected on the XY plane shown in fig. 5 and 3; the projected area of the end cap 120 in the first direction, that is, the area projected on the XY plane shown in fig. 5 and 3. Wherein the XY plane is perpendicular to the Z direction.

By the above arrangement, when the end cap 120 is covered with the case 110, the conductive member 420 can be completely accommodated in the case 110 without interfering with the contact between the conductive member 420 and the current collector 410.

Referring to fig. 5 and 3, in the first direction, the ratio of the projected area of the conductive member 420 to the projected area of the end cap 120 is in the range of 0.3-0.5.

Optionally, the ratio of the projected area of the conductive member 420 to the projected area of the end cap 120 is 0.35-0.45, for example, 0.4.

By the above arrangement, the ratio range of the projection area of the conductive member 420 to the projection area of the end cover 120 in the first direction is limited, so that the conductive member 420 can be completely contained in the housing 110, and meanwhile, the overcurrent area of the conductive member 420 is maximized.

Referring to fig. 5 and 3, in the first direction, the projected area of the conductive member 420 is smaller than the projected area of the current collector 410 according to some embodiments of the present application.

The projected area of the current collector 410 in the first direction, that is, the area projected on the XY plane shown in fig. 5 and 3. Wherein the XY plane is perpendicular to the Z direction.

With the above arrangement, when the end cap 120 is covered with the case 110, the conductive material 420 can be sufficiently brought into contact with the current collector 410.

Referring to fig. 5 and 3, in the first direction, the ratio of the projected area of the conductive member 420 to the projected area of the current collector 410 is in the range of 0.6 to 0.9.

Optionally, the ratio of the projected area of the conductive member 420 to the projected area of the end cap 120 is 0.65-0.85, for example, 0.8.

By the above arrangement, by limiting the range of the ratio of the projected area of the conductive member 420 to the projected area of the current collector 410 in the first direction, the conductive member 420 is sufficiently abutted against the current collector 410 while maximizing the overcurrent area of the conductive member 420.

Referring to fig. 5, the conductive member 420 has a block structure according to some embodiments of the present application.

In the embodiment of the present application, the conductive member 420 has conductive performance and is capable of being elastically deformed by being pressed. For example, when the end cap 120 is covered with the case 110, the conductive member 420 abuts against the current collector 410, and the conductive member 420 is in a compressed state; when the cap 120 is separated from the case 110, the conductive member 420 is separated from the current collector 410, and the conductive member 420 is in an initial state.

In the embodiment of the present application, the conductive member 420 has a block structure, and the conductive member 420 may have a rectangular parallelepiped, a square, a cylinder or other irregular shape, and the specific shape of the conductive member 420 is not limited herein.

With the above arrangement, when the cap 120 is covered with the case 110, the conductive member 420 is in a compressed state, and the conductive member 420 can be abutted against the current collector 410 while helping to compress and fix the electrode assembly 300; when the cap 120 is separated from the case 110, the conductive member 420 is separated from the current collector 410, and the conductive member 420 is restored to an original state due to elasticity.

Referring to fig. 6, the conductive member 420 is conductive foam according to some embodiments of the present application.

In the embodiment of the application, the conductive foam is formed by wrapping conductive cloth outside the flame-retardant sponge, and the flame-retardant sponge has good surface conductivity after a series of treatments. The conductive foam may be nickel-plated copper conductive foam, gold-plated conductive foam, carbon-plated conductive foam, tin-plated conductive foam, and the like, and the specific type of the conductive foam is not limited herein. Further, referring to fig. 7, a plurality of liquid suction holes may be further formed in the conductive foam, and when the end cap 120 is covered with the housing 110, the housing 110 is loaded with the electrode assembly 300 and the electrolyte, and the liquid suction holes can absorb the excessive electrolyte, so that the probability of lithium precipitation when the battery cell 22 is used is effectively reduced.

By the above arrangement, the conductive member 420 can have conductivity and be elastically deformed by being pressed.

According to some embodiments of the present application, referring to fig. 6, the compression range of the conductive foam is 50% -80%.

Preferably, the compression of the conductive foam is 60%. When the conductive foam is compressed to a compression amount of 60%, the conductive foam can be self-adapted to the installation space in the housing 100, and the conductive foam can be assisted to compress and fix the electrode assembly 300.

Through the arrangement, on the basis that the conductive foam has conductivity, the compression deformation of the conductive foam is optimized.

Referring to fig. 3 to 5, the electrode portion 101 includes a first electrode portion 101a and a second electrode portion 101b with opposite polarities, the first electrode portion 101a is disposed on the housing 110, the second electrode portion 101b is disposed on the end cover 120, and the electrode assembly 300 includes a first tab and a second tab with opposite polarities. The first tab is electrically connected to the first current collector 411, and a first conductive member 421 is disposed on a side of the housing 110 facing away from the first electrode portion 101a, where the first conductive member 421 is electrically connected to the first current collector 411; the second electrode lug is electrically connected to the second current collector 412, and a second conductive member 422 is disposed on a side of the end cap 120 facing away from the second electrode portion 101b, where the second conductive member 422 is electrically connected to the second current collector 412.

In the embodiment of the present application, one of the first electrode portion 101a and the second electrode portion 101b is a positive electrode, and the other of the first electrode portion 101a and the second electrode portion 101b is a negative electrode. The first tab has the same polarity as the first electrode portion 101a, and the second tab has the same polarity as the second electrode portion 101 b.

With the above arrangement, when the end cap 120 is covered with the case 110, the tab can be electrically connected to the corresponding electrode portion 101.

According to some embodiments of the present application, referring to fig. 3, the first electrode portion 101a is an electrode terminal protruding from the case 110, and the second electrode portion 101b is a conductive plane area disposed on a side of the end cap 120 facing the electrode assembly 300.

In the embodiment of the present application, the electrode terminals are fixed to the case 110 by welding or riveting, and the conductive flat area is integrally formed on the side of the end cap 120 facing the electrode assembly 300 by printing or other means.

With the above arrangement, the electrode portions 101 having opposite polarities can be smoothly provided on the case 100, and the overall volume of the battery cell 22 can be reduced.

Referring to fig. 2, a battery 20 according to one embodiment of the present application includes the above-described battery cells 22.

The battery 20 further includes a case 21, and the battery cell 22 is disposed in the case 21.

In the above-mentioned battery 20, the current collector 410 of the battery cell 22 is electrically connected with the tab of the electrode assembly 300, the conductive member 420 is electrically connected with the electrode portion 101, and the electrical connection between the electrode portion 101 and the electrode assembly 300 can be achieved only by contacting the current collector 410 with the conductive member 420 without welding, so that the conditions that the battery cell 22 is affected by welding slag, temperature rise, etc. due to welding are improved, and the performance stability and reliability of the battery cell 22 are improved.

Referring to fig. 2, according to some embodiments of the present application, a powered device in an embodiment includes a battery 20 as described above.

The electric device can realize the electric connection between the electrode part 101 and the electrode assembly 300 without welding the battery 20, thereby improving the conditions of influencing the battery cell 22 due to welding slag, temperature rise and the like, and being beneficial to improving the performance stability and reliability of the electric device.

Referring to fig. 2 to 7, the battery cell 22 in one embodiment includes a case 100, an electrode assembly 300, and a conductive structure 400, the case 100 includes a case 110 and an end cap 120, the case 110 has an opening 111, and the end cap 120 is detachably disposed at the opening 111; the electrode assembly 300 is accommodated in the housing 110, the conductive structure 400 includes a current collector 410 and a conductive member 420, the electrode portion 101 includes a first electrode portion 101a and a second electrode portion 101b with opposite polarities, the first electrode portion 101a is disposed in the housing 110, the second electrode portion 101b is disposed in the end cover 120, and the electrode assembly 300 includes a first tab and a second tab with opposite polarities. The first tab is electrically connected to the first current collector 411, and a first conductive member 421 is disposed on a side of the housing 110 facing away from the first electrode portion 101a, where the first conductive member 421 is electrically connected to the first current collector 411; the second electrode lug is electrically connected to the second current collector 412, and a second conductive member 422 is disposed on a side of the end cap 120 facing away from the second electrode portion 101b, where the second conductive member 422 is electrically connected to the second current collector 412.

The conductive member 420 is conductive foam, and the compression amount of the conductive foam ranges from 50% to 80%. In the first direction, the ratio of the projected area of the conductive member 420 to the projected area of the end cap 120 ranges from 0.3 to 0.5, and the ratio of the projected area of the conductive member 420 to the projected area of the current collector 410 ranges from 0.6 to 0.9.

According to some embodiments of the present application, referring to fig. 2, a battery 20 in an embodiment includes a case 21 and the battery cell 22, where the battery cell 22 is disposed in the case 21.

According to some embodiments of the present application, referring to fig. 1, a powered device in an embodiment includes a battery 20 as described above, where the battery 20 is configured to power the powered device.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (14)

1. A battery cell (22), comprising:

a case (100) provided with an electrode section (101);

an electrode assembly (300) housed in the case (100);

a conductive structure (400) housed in the housing (100);

The conductive structure (400) comprises a current collector (410) and a conductive piece (420), wherein the conductive piece (420) is fixed on the inner side of the shell (100) and is electrically connected with the electrode part (101), and the current collector (410) is electrically connected with the electrode assembly (300);

The conductive piece (420) can be elastically deformed under pressure, the shell (100) comprises a shell (110) and an end cover (120), and when the end cover (120) is covered with the shell (110), the conductive piece (420) is abutted with the current collector (410) and a circuit between the conductive piece and the current collector is conducted.

2. The battery cell (22) of claim 1, wherein the conductive member (420) is disposed on a side of the end cap (120) facing the electrode assembly (300), the current collector (410) is disposed on a side of the electrode assembly (300) facing the end cap (120), and the conductive member (420) abuts the current collector (410) and presses against the electrode assembly (300) when the end cap (120) is covered with the case (110).

3. The battery cell (22) of claim 1, wherein the housing (110) has an opening (111), the end cap (120) is removably disposed in the opening (111), and the electrode portion (101) is disposed on a side of the end cap (120) facing away from the electrode assembly (300).

4. The battery cell (22) of claim 3, wherein the projected area of the conductive member (420) is smaller than the projected area of the end cap (120) in a first direction, the first direction being a thickness direction of the end cap (120).

5. The battery cell (22) of claim 4, wherein a ratio of a projected area of the conductive member (420) to a projected area of the end cap (120) in the first direction is in a range of 0.3-0.5.

6. The battery cell (22) of claim 4, wherein a projected area of the conductive member (420) is smaller than a projected area of the current collector (410) in the first direction.

7. The battery cell (22) of claim 6, wherein a ratio of a projected area of the conductive member (420) to a projected area of the current collector (410) in the first direction is in a range of 0.6 to 0.9.

8. The battery cell (22) of claim 3, wherein the electrode portion (101) comprises a first electrode portion (101 a) and a second electrode portion (101 b) having opposite polarities, the first electrode portion (101 a) is disposed on the housing (110), the second electrode portion (101 b) is disposed on the end cap (120), and the electrode assembly (300) comprises a first tab and a second tab having opposite polarities;

The first tab is electrically connected with the first current collector (411), a first conductive piece (421) is arranged on one side of the shell (110) away from the first electrode part (101 a), and the first conductive piece (421) is used for being electrically connected with the first current collector (411);

The second lug is electrically connected with the second current collector (412), a second conductive piece (422) is arranged on one side of the end cover (120) away from the second electrode part (101 b), and the second conductive piece (422) is used for being electrically connected with the second current collector (412).

9. The battery cell (22) of claim 8, wherein the first electrode portion (101 a) is an electrode terminal protruding from the case (110), and the second electrode portion (101 b) is a conductive planar region provided on a side of the end cap (120) facing the electrode assembly (300).

10. The battery cell (22) of claim 1, wherein the conductive member (420) is of a block-like structure.

11. The battery cell (22) of claim 10, wherein the conductive member (420) is conductive foam.

12. The battery cell (22) of claim 11, wherein the conductive foam has a compression in the range of 50% -80%.

13. A battery (20) comprising a cell (22) according to any one of claims 1-12.

14. A powered device comprising a battery (20) as claimed in claim 13.