CN218586037U - Battery cell, battery and power consumption device - Google Patents

Abstract

The present application relates to a battery cell, a battery and an electric device, the battery cell including a case, an electrode assembly, an electrode lead-out member, and a support member; the electrode assembly is accommodated in the shell and comprises a main body part and a tab led out from the end face of the main body part; the electrode leading-out piece is connected with the pole ear and extends to the outside of the shell; the support member is accommodated in the housing and located at a side of the main body portion facing the tab, the support member being provided with a through hole through which the electrode lead-out piece passes. The battery cell, the battery and the electric device provided by the embodiment of the application aim at improving the structural strength of the winding pole piece group and the overall safety and reliability.

Description

Battery cell, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to a single battery, a battery and an electric device.

Background

The battery cell is widely used in electronic devices such as a mobile phone, a notebook computer, a battery car, an electric airplane, an electric ship, an electric toy car, an electric toy ship, an electric toy airplane, an electric tool, and the like. The battery monomer can include a cadmium-nickel battery monomer, a hydrogen-nickel battery monomer, a lithium ion battery monomer, a secondary alkaline zinc-manganese battery monomer and the like.

In addition to improving the performance of the battery cell, safety issues are a considerable problem in the development of battery technology. If the safety problem of the battery cell cannot be guaranteed, the battery cell cannot be used. Therefore, how to enhance the safety of the battery cell is a technical problem to be solved urgently in the battery technology.

Disclosure of Invention

The application provides a battery monomer, battery and power consumption device aims at solving and promotes the free security performance of battery.

In a first aspect, the present application provides a battery cell including a case, an electrode assembly accommodated in the case and including a main body portion and tabs led out from end surfaces of the main body portion, an electrode lead-out member, and a support member; the electrode leading-out piece is connected with the pole ear and extends to the outside of the shell; the support member is accommodated in the housing and located at a side of the main body portion facing the tab, the support member being provided with a through hole through which the electrode lead-out piece passes.

According to the battery cell, the supporting member is arranged on one side, facing the pole lugs, of the main body part, the supporting member is provided with the through holes, the electrode leading-out pieces penetrate through the through holes, namely the supporting member is arranged at one end, provided with the pole lugs, of the electrode assembly, so that the supporting member is utilized to provide support for the pole lugs and the electrode leading-out pieces, the rigidity of the pole lug area in the electrode assembly is enhanced, and the safety and the reliability of the pole lug part are improved.

According to an embodiment of the first aspect of the present application, the support member comprises a first recess, the first recess being recessed from a surface of the support member facing the main body portion; at least part of the tab is accommodated in the first recess; the through hole penetrates through the bottom wall of the first concave part.

According to the battery cell provided by the embodiment of the application, the first concave part formed by sinking the surface of the self-supporting member facing the main body part is arranged, so that at least part of the tab is accommodated in the first concave part, the side wall of the first concave part is utilized to effectively protect the tab, the tab is prevented from being bent in vibration and shaking, and the short circuit at the tab is further effectively avoided; meanwhile, the through hole is formed in the bottom wall penetrating through the first concave portion, so that the electrode leading-out piece can extend out through the through hole, the convergence of the pole lug is facilitated, and the welding performance of the pole lug is enhanced.

According to one embodiment of the first aspect of the present application, the tab is welded to the electrode lead-out member and a weld is formed, the weld being received in the first recess.

According to the battery monomer of this application embodiment, through injecing utmost point ear and the welding of electrode extraction piece, when guaranteeing utmost point ear and the joint strength of electrode extraction piece, increased the area of contact of utmost point ear with the electrode extraction piece, and then increased the electric conductive property of utmost point ear with the electrode extraction piece.

According to an embodiment of the first aspect of the present application, the support member further includes a plurality of support ribs formed to extend from the side wall of the first recess and located on both sides of the tab in the first direction.

According to battery cell of this application embodiment, extend from the lateral wall of first concave part through setting up a plurality of brace rods and form, and be located utmost point ear along the both sides of first direction to utilize a plurality of brace rods to support utmost point ear jointly, further promoted electrode subassembly middle ear partial structural strength, the reliability is higher.

According to an embodiment of the first aspect of the present application, an orthographic projection of the plurality of support ribs to the bottom wall does not overlap the through hole.

According to the battery monomer of this application embodiment, through setting up a plurality of brace rods to the orthographic projection of diapire and the non-overlapping of through-hole to avoid the brace rod to cause the through-hole to block, in the free production process of battery, can guarantee that the electrode draws the smooth and easy nature of piece through the through-hole.

According to an embodiment of the first aspect of the present application, the support member further comprises a second recess, the second recess being recessed from a surface of the support member facing away from the main body portion; the second concave part and the first concave part are arranged along the second direction in a staggered mode.

According to the battery cell of this application embodiment, through set up the second concave part on the surface that the supporting member deviates from the main part to under the prerequisite of ensureing the structural strength of supporting member, utilize the second concave part to reduce the self weight of supporting member, and then reduce battery cell's weight, promote battery cell's energy density.

According to an embodiment of the first aspect of the present application, the support member abuts an end surface of the main body portion.

According to the battery cell of the embodiment of the application, the support member is arranged to abut against the end face of the main body part, namely the end face of the main body part is used for providing support for the support member, so that the mounting stability and reliability of the support member are enhanced.

According to an embodiment of the first aspect of the present application, a dimension of the through hole along the first direction is T1, and a dimension of the electrode lead-out member along the first direction is T2, then T1 and T2 satisfy: t1 > T2.

According to the battery cell of the embodiment of the application, the size T1 of the through hole along the first direction and the size T2 of the electrode leading-out piece along the first direction are set to satisfy that T1 is larger than T2, so that the electrode leading-out piece can smoothly pass through the through hole.

According to an embodiment of the first aspect of the present application, if the size of the tab in the first direction is T3, T2 and T3 satisfy 1 ≦ T2/T3 ≦ 4.

According to the battery cell provided by the embodiment of the application, the size T3 of the tab along the first direction is set to satisfy the value of T2/T3 ≦ 4, that is, the overcurrent capacity of the tab and the electrode leading-out piece is optimized and the heat dissipation performance of the tab and the electrode leading-out piece is optimized by controlling the sizes of the tab and the electrode leading-out piece in the first direction.

According to an embodiment of the first aspect of the present application, a dimension of the support member in the first direction is T4, and a dimension of the electrode assembly in the first direction is T5, then T4 and T5 satisfy: 1/3 ≦ T4/T5 ≦ 1.

According to the battery cell of the embodiment of the application, the size T4 of the supporting member along the first direction and the size T5 of the electrode assembly along the first direction are set to satisfy 1/3 ≦ T4/T5 ≦ 1, that is, the size of the electrode assembly along the first direction is set to be greater than or equal to the size of the supporting member along the first direction, so that the supporting member can be stably supported on the electrode assembly, and the structural stability of the battery cell is further improved.

According to an embodiment of the first aspect of the present application, the main body portion includes a first main body portion and a second main body portion, the first main body portion and the second main body portion are in central symmetry along the first direction, the tab includes a first tab led out from the first main body portion and a second tab led out from the second main body portion, and the first tab and the second tab are disposed in an overlapping manner.

According to the battery cell provided by the embodiment of the application, the main body part comprises the first main body part and the second main body part, so that the capacity of the battery cell is increased, and the releasable energy of the battery cell in the discharging process is promoted; through setting up first utmost point ear and overlapping with the second utmost point ear to make first utmost point ear and second utmost point ear can be connected with electrode extraction piece better, structural reliability is stronger.

According to an embodiment of the first aspect of the present application, the first tab is located on a side of the first body portion adjacent to the second body portion; the second tab is positioned on one side of the second main body part close to the first main body part, and the first tab is connected with the second tab.

According to the battery monomer of this application embodiment, through setting up first utmost point ear and being located the one side that first main part is close to the second main part, the second utmost point ear is located the one side that the second main part is close to first main part, so that first utmost point ear and second utmost point ear can be close to the setting, before utmost point ear and electrode extraction piece are connected promptly, implement once flattening for first utmost point ear and second utmost point ear respectively, make first utmost point ear and second utmost point ear be close to the setting, in the course of being connected of follow-up utmost point ear and electrode extraction piece, make first utmost point ear and second utmost point ear can be connected with electrode extraction piece in a connection process, thereby save the connection process, promote the free production efficiency of battery.

According to an embodiment of the first aspect of the application, the first tab is welded to the second tab.

According to the battery monomer of this application embodiment, through setting up first utmost point ear and the welding of second utmost point ear, effectively promoted the wholeness of utmost point ear, further promoted electrode subassembly's wholeness and reliability.

According to one embodiment of the first aspect of the application, the electrode lead-out is located on a side of the first tab facing away from the second tab, the electrode lead-out being welded to the first tab; or the electrode leading-out piece is positioned on one side, away from the first pole lug, of the second pole lug, and the electrode leading-out piece is welded with the second pole lug.

According to the battery cell of this application embodiment, electrode extraction piece can set up in one side that is close to first utmost point ear of utmost point ear promptly, or one side that is close to second utmost point ear, has simplified the step of being connected of utmost point ear with electrode extraction piece, has further increased the reliability of being connected of electrode extraction piece and utmost point ear.

According to an embodiment of the first aspect of the present application, each of the first tab and the second tab includes a positive tab and a negative tab, the positive tab and the negative tab are symmetrically disposed along a second direction, and the second direction intersects with the first direction; the support member is disposed proximate to the positive electrode tab and/or the support member is disposed proximate to the negative electrode tab.

According to the battery cell of the embodiment of the application, the support member is arranged close to the positive electrode tab and/or the support member is arranged close to the negative electrode tab, so that the support member can provide support for the tabs at one end or two ends of the electrode assembly, and the reliability of the battery cell is further improved.

According to one embodiment of the first aspect of the present application, the housing comprises a metal plastic film.

According to the battery monomer of this application embodiment, include the metal plastic film through setting up the shell to utilize the metal plastic film to wrap up electrode subassembly and supporting member, when guaranteeing battery monomer's gas tightness, can make the supporting member support in electrode subassembly better.

In a second aspect, the present application provides a battery including a battery cell as set forth in any of the embodiments of the first aspect of the present application.

In a third aspect, the present application provides an electrical device comprising a battery as set forth in any of the embodiments of the second aspect of the present application, the battery being configured to provide electrical energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed 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 a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

Fig. 1 is an exploded perspective view of a battery cell according to an embodiment of the present disclosure;

fig. 2 is a schematic plan view of a battery cell according to an embodiment of the present application with the outer case removed;

fig. 3 is a schematic perspective view illustrating a support member in a battery cell according to an embodiment of the present disclosure;

fig. 4 isbase:Sub>A cross-sectional view of the battery cell shown in fig. 2 taken along linebase:Sub>A-base:Sub>A;

fig. 5 is an enlarged view of a portion B of the battery cell shown in fig. 4.

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

Wherein, in the figures, the respective reference numerals: 100. a battery cell; 10. a housing; 20. an electrode assembly; 21. a main body portion; 211. a first main body portion; 212. a second main body portion; 22. a tab; 221. a first tab; 222. a second tab; 30. an electrode lead-out member; 40. a support member; 41. a through hole; 42. a first recess; 43. supporting ribs; 44. a second recess; 101. welding the part; 102. a positive electrode tab; 103. a negative electrode tab; 1. a first direction; 2. a second direction.

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," 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.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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.

In this application, the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a lithium sodium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, and the like, and this is not limited in this application embodiment. 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 battery pack is characterized by also comprising a cylindrical battery monomer, a square battery monomer and a bag-shaped battery monomer, which are not limited by the embodiment of the application.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and a separator. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive current collector; the positive electrode current collector comprises a positive electrode current collecting portion and a positive electrode lug protruding out of the positive electrode current collecting portion, the positive electrode current collecting portion is coated with a positive electrode active substance layer, and at least part of the positive electrode lug is not coated with the positive electrode active substance layer. Taking a lithium ion battery monomer as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece comprises a negative pole current collector and a negative pole active substance layer, and the negative pole active substance layer is coated on the surface of the negative pole current collector; the negative current collector comprises a negative current collecting part and a negative electrode lug protruding out of the negative current collecting part, the negative current collecting part is coated with a negative electrode active substance layer, and at least part of the negative electrode lug is not coated with the negative electrode active substance layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, 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 spacer may be PP (polypropylene) or PE (polyethylene). 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.

The battery cell may further include a case having a receiving cavity therein, the receiving cavity being a closed space provided by the case for the electrode assembly and the electrolyte. The shell can comprise a shell body and an end cover assembly, wherein the shell body can be a hollow structure with one side opened and also can be a bag-shaped structure formed by a metal plastic film; the end cap assembly may include an end cap covering the opening of the case and forming a sealing connection to form a closed receiving chamber for receiving the electrode assembly and the electrolyte.

In the battery cell of the related art, an electrode lead-out member is also generally provided at the electrode assembly, so that the tab is led out to other devices outside the case to be connected, thereby achieving the charge and discharge of the battery cell. In contrast, the inventor found that the structure of the joint between the tab and the electrode lead-out member is often weak, so that the tab is easily bent and bent after being used for a long time, and further the tab is connected with the main body part, and further the battery cell is short-circuited, or even dangerous.

In view of the above, the present invention provides a technical solution in which a support member is disposed in a battery cell at a position close to a tab, so as to support the tab and an electrode lead-out member by using the support member, thereby enhancing the structural strength of the tab region and the overall rigidity of the battery cell. The battery monomer with the structure can reduce the possibility of bending and bending phenomena of the pole ear, and has higher safety and reliability.

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 module or a battery pack, etc. 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 technical scheme described in the embodiment of the application is suitable for the electrode assembly, the battery cell containing the electrode assembly, the battery containing the battery cell and the electric equipment using the battery.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of explanation, the following embodiments will be described by taking an electric device as an example of a vehicle.

For a better understanding of the present application, embodiments of the present application are described below with reference to fig. 1 to 5.

Fig. 1 is an exploded perspective view of a battery cell according to an embodiment of the present disclosure; fig. 2 is a schematic plan view of a battery cell according to an embodiment of the present application after being taken out of a housing.

As shown in fig. 1 and 2, the present application proposes a battery cell 100 including a case 10, an electrode assembly 20, an electrode lead-out 30, and a support member 40, the electrode assembly 20 being accommodated in the case 10 and including a main body portion 21 and tabs 22 led out from end surfaces of the main body portion 21; the electrode lead-out 30 is connected to the tab 22 and extends to the outside of the case 10; the support member 40 is received in the case 10 at a side of the body portion 21 facing the tab 22, the support member 40 being provided with a through hole 41, the electrode lead 30 passing through the through hole 41.

The case 10 serves to provide a sealed space for the electrode assembly 20 and the electrolyte to accommodate the electrode assembly 20 and the electrolyte and to provide a stable charging and discharging environment.

The electrode assembly 20 is accommodated in the can 10, i.e., the structure of the can 10 is adapted to the structure of the electrode assembly 20. For example, in some embodiments, the case 10 may be a rigid structure, and the electrode assembly 20 is wrapped with an electrolyte to form a rigid rectangular structure, a cylindrical structure, or the like; in some embodiments, the case 10 may have a flexible structure, and a flexible plastic film is coated on the outside of the electrode assembly 20 to form a sealed space.

The main body 21 is a main structure of the electrode assembly 20, which is composed of positive electrode plates, negative electrode plates, and separators, wherein the positive electrode plates and the negative electrode plates are alternately arranged, the separators are arranged between the adjacent positive electrode plates and negative electrode plates, and electrons can pass through the separators to move between the adjacent positive electrode plates and negative electrode plates through the electrolytes, so as to realize charging and discharging of the battery cells.

The tab 22 is drawn from the end face of the main body 21, which means that at least one tab 22 is drawn from one end of each of the positive electrode tab and the negative electrode tab. At this time, it is necessary to ensure that tabs led out from a plurality of positive electrode plates overlap in the thickness direction, and tabs led out from a plurality of negative electrode plates overlap in the thickness direction.

The electrode lead-out member 30 is connected to the tab 22, and possible embodiments are welding, riveting, or direct integral molding between the electrode lead-out member 30 and the tab 22.

The electrode lead 30 extends to the outside of the case 10, i.e., the tab 22 can be connected to an external device through the electrode lead 30, thereby increasing weldability of the tab 22 to the external device.

The support member 40 is received in the housing 10 on the side of the main body 21 facing the tab 22, and it is possible to connect the support member 40 with the housing 10 to form a structurally stable support member 40 to provide support for the tab 22 and the electrode lead-out 30; alternatively, the support member 40 may be provided to abut against the body 21, and the displacement of the support member 40 in the housing 10 may be restricted by the structure of the housing 10, so as to ensure the support effect of the support member 40 on the tab 22 and the electrode lead 30.

Illustratively, in the embodiment in which the battery cell 100 is a pouch-shaped battery, the support member 40 may be disposed adjacent to the tab 22 and abutted against the body portion 21, and the casing may be made of a soft plastic film to cover the electrode assembly 20 and the support member 40, so that the relative position between the support member 40 and the tab 22 is maintained stably, and the support member 40 provides support protection for the tab 22. At this time, one end of the electrode lead 30 is fixedly connected to the tab 22, and the other end thereof may extend out of the case 10 through the through hole 41 formed in the supporting member 40, so as to be connected to an external device, thereby charging and discharging the battery cell 100.

The support member 40 is provided with a through hole 41, and the through hole 41 may be disposed to penetrate through both opposite surfaces of the support member 40, in which case the electrode lead-out 30 may be directly extended from one end of the through hole 41 and extended from the other end; in some embodiments, the through hole 41 may also be disposed to penetrate through the two intersecting surfaces of the supporting member 40, and at this time, the electrode lead-out member 30 may be bent and bent to extend from the other end after extending through one end of the through hole 41, and the structure may be selected according to the structure of the battery cell 100.

According to the battery cell 100 of the embodiment of the present application, by providing the support member 40 at the side of the body part 21 facing the tab 22 and providing the support member 40 with the through hole 41, the electrode lead-out member 30 passes through the through hole 41, that is, providing the support member 40 at the end of the electrode assembly 20 where the tab 22 is provided, to provide support for the tab 22 and the electrode lead-out member 30 by using the support member 40, to enhance the rigidity of the tab 22 region in the electrode assembly 20, thereby increasing the safety and reliability of the tab 22 portion.

Fig. 3 is a schematic perspective view illustrating a support member of a battery cell according to an embodiment of the present disclosure.

As shown in fig. 1 to 3, according to one embodiment of the first aspect of the present application, the support member 40 includes a first recess 42, the first recess 42 being recessed from a surface of the support member 40 facing the main body portion 21; at least part of the tab 22 is accommodated in the first recess 42; the through hole 41 penetrates the bottom wall of the first recess 42.

The first recess 42 is recessed from the surface of the support member 40 facing the body portion 21, meaning that the first recess 42 is recessed from the support member 40 at a position corresponding to the tab 22 to form support protection for the tab 22 with the side wall of the first recess 42.

During the production of the battery cell 100, the side wall of the first recess 42 may abut against the main body 21, so that the side wall and the bottom wall of the first recess 42 cooperate with the main body 21 to form a space for accommodating the tab 22, and the side wall of the first recess 42 may be used to support the tab 22 and the electrode lead-out member 30.

At least a portion of the tab 22 is accommodated in the first recess 42, which means that at least a portion of the tab 22 is accommodated in a space formed by the side wall and the bottom wall of the first recess 42 cooperating with the main body 21, wherein "at least a portion" may refer to a connection portion of the tab 22 and the electrode lead-out member 30, so that the connection portion of the tab 22 and the electrode lead-out member 30 may be supported by the side wall of the first recess 42, and the connection portion is prevented from being bent or bent, thereby improving the structural reliability of the connection portion.

The through hole 41 penetrates the bottom wall of the first recess 42, meaning that both ends of the through hole 41 penetrate both side surfaces of the bottom wall of the first recess 42, respectively, so that the end of the electrode lead-out member 30, which is not connected to the tab 22, can protrude through the through hole 41 and be used for connection to an external device.

According to the battery cell 100 of the embodiment of the application, the first concave portion 42 formed by recessing the surface of the self-supporting member 40 facing the main body portion 21 is provided, so that at least part of the tab 22 is accommodated in the first concave portion 42, the side wall of the first concave portion 42 is utilized to effectively protect the tab 22, the tab 22 is prevented from being bent in vibration and shaking, and short circuit at the tab 22 is further effectively avoided; meanwhile, the through hole 41 is formed through the bottom wall of the first recess 42, so that the electrode lead-out member 30 can be extended through the through hole 41, thereby facilitating the bundling of the tab 22 and enhancing the weldability of the tab 22.

According to an embodiment of the first aspect of the present application, the support member 40 further includes a plurality of support ribs 43, and the plurality of support ribs 43 are formed extending from the side wall of the first recess 42 and located on both sides of the tab 22 in the first direction 1.

In the embodiments of the present application, by providing the supporting member 40 and further including the plurality of supporting ribs 43, on one hand, the distance from the side wall of the first recess 42 to the tab 22 and/or the electrode lead-out piece 30 can be reduced, so as to further reduce the amount of deformation of the tab 22 and the electrode lead-out piece 30, and further increase the structural stability of the tab 22 and the electrode lead-out piece 30, and on the other hand, the supporting member 40 itself can also be limited by the supporting ribs 43, so as to avoid an excessive displacement of the supporting member 40 relative to the main body 21 during installation or use, and thus the structural stability of the battery cell 100 is better.

In the embodiments of the present application, the first direction 1 may be a thickness direction of the tab 22 or the electrode lead-out member 30, and in some embodiments, the first direction 1 may also be a width direction of the tab 22 or the electrode lead-out member 30, and it is sufficient to further reduce a gap between the tab 22 or the electrode lead-out member 30 and a sidewall of the first recess 42, which may be selected according to actual conditions of production.

According to the battery unit 100 of the embodiment of the application, the plurality of supporting ribs 43 are formed by extending from the side wall of the first recess 42 and are positioned on the two sides of the tab 22 along the first direction 1, so that the tab 22 is supported by the plurality of supporting ribs 43 together, the structural strength of the tab 22 part in the electrode assembly 20 is further improved, and the reliability is higher.

According to an embodiment of the first aspect of the present application, the orthographic projection of the plurality of support ribs 43 to the bottom wall does not overlap the through hole 41.

The orthographic projection of the plurality of support ribs 43 to the bottom wall does not overlap the through hole 41, which means that the plurality of support ribs 43 do not extend to overlap the through hole 41.

For example, in some embodiments, a plurality of support ribs 43 may be provided to extend from the side wall of the first recess 42 in a direction parallel to the bottom wall and extend to a position parallel to the wall of the through hole 41 to stop extending, so as to reduce the shielding of the through hole 41 by the support ribs 43 and facilitate the extension of the electrode lead-out member 30.

According to the battery cell 100 of the embodiment of the application, the orthographic projection of the plurality of support ribs 43 to the bottom wall is not overlapped with the through hole 41, so that the support ribs 43 are prevented from blocking the through hole 41, and the smoothness of the electrode leading-out piece 30 passing through the through hole 41 can be ensured in the production process of the battery cell 100.

According to an embodiment of the first aspect of the present application, the support member 40 further comprises a second recess 44, the second recess 44 being recessed from a surface of the support member 40 facing away from the main body portion 21; the second recess 44 is offset from the first recess 42 in the second direction 2.

The second recess 44 is provided to reduce the material of the supporting member 40 and reduce the self weight of the supporting member 40, so as to further improve the safety and reliability of the battery cell 100. In these embodiments of the present application, the second recess 44 is provided recessed from the surface of the support member 40 facing away from the main body portion 21; in other embodiments of the present application, the second recess 44 may also be provided to be recessed from a side surface of the support member 40 to reduce the self weight of the support member 40.

The second recess 44 and the first recess 42 are arranged in a staggered manner along the second direction 2, so as to avoid the collision of the positions of the first recess 42 and the second recess 44, which results in the function damage of the two. In some embodiments of the present application, the second recess 44 may also be provided as a hollow structure provided within the support member 40, which is intended to reduce the self-weight of the support member 40.

According to the battery cell 100 of the embodiment of the application, the second concave part 44 is arranged on the surface of the supporting member 40, which is far away from the main body part 21, so that the self weight of the supporting member 40 is reduced by the second concave part 44 on the premise of ensuring the structural strength of the supporting member 40, the weight of the battery cell 100 is further reduced, and the energy density of the battery cell 100 is improved.

Fig. 4 isbase:Sub>A cross-sectional view of the battery cell shown in fig. 2 taken along linebase:Sub>A-base:Sub>A; fig. 5 is an enlarged view of a portion B of the battery cell shown in fig. 4.

As shown in fig. 1 to 5, according to one embodiment of the first aspect of the present application, the tab 22 is welded to the electrode lead-out member 30 and a welded portion 101 is formed, the welded portion 101 being received in the first recess 42.

The tab 22 is welded to the electrode lead-out member 30 and the welded part 101 is formed, and it is possible to perform a laser welding process between the tab 22 and the electrode lead-out member 30 or an ultrasonic welding process between the tab 22 and the electrode lead-out member 30.

The welding portion 101 is accommodated in the first recess 42, that is, the welding portion 101 is accommodated in the space formed by the side wall and the bottom wall of the first recess 42 and the main body 21, so as to provide all-around support and protection for the welding portion 101, further strengthen the structural strength of the tab 22 and the electrode lead-out member 30, and increase the weldability of the tab 22 with the outside.

According to the battery cell 100 of the embodiment of the application, by limiting the welding of the tab 22 and the electrode lead-out member 30, the connection strength of the tab 22 and the electrode lead-out member 30 is ensured, and meanwhile, the contact area of the tab 22 and the electrode lead-out member 30 is increased, so that the conductivity of the tab 22 and the electrode lead-out member 30 is increased.

According to one embodiment of the first aspect of the present application, the support member 40 abuts an end surface of the main body portion 21.

The supporting member 40 abuts against the end face of the main body portion 21, that is, the supporting member 40 is supported on the end face of the main body portion 21, and the relative position with the main body portion 21 is ensured under the wrapping effect of the housing 10.

In some embodiments of the present application, the supporting member 40 may also be disposed to abut against a side wall surface of the main body portion 21, and in these embodiments of the present application, the side wall surface of the main body portion 21 may be "sandwiched" by a side wall of the first recess 42 to achieve the primary positioning of the supporting member 40 and the main body portion 21, and to ensure the relative position of the supporting member 40 and the main body portion 21 by using the housing 10.

According to the battery cell 100 of the embodiment of the application, the support member 40 is arranged to abut against the end face of the main body portion 21, that is, the end face of the main body portion 21 is used for providing support for the support member 40, so that the stability and reliability of installation of the support member 40 are enhanced.

According to an embodiment of the first aspect of the present application, the dimension of the through hole 41 in the first direction 1 is T1, and the dimension of the electrode lead-out member 30 in the first direction 1 is T2, then T1 and T2 satisfy: t1 > T2.

The first direction 1 may be a thickness direction of the electrode lead 30, or the first direction 1 may be a width direction of the electrode lead 30. So that the electrode lead-out member 30 can smoothly pass through the through-hole 41. That is, the through-hole 41 has a larger size than the electrode lead-out member 30 in both the thickness and width directions of the electrode lead-out member 30.

According to the battery cell 100 of the embodiment of the present application, by providing the dimension T1 of the through-hole 41 in the first direction 1 and the dimension T2 of the electrode lead-out member 30 in the first direction 1 to satisfy T1 > T2, it is possible to ensure that the electrode lead-out member 30 can smoothly pass through the through-hole 41.

According to an embodiment of the first aspect of the present application, the size of the tab 22 along the first direction 1 is T3, and T2 and T3 satisfy 1 ≦ T2/T3 ≦ 4.

Since the thicker the tab 22 is, the stronger the overcurrent capacity and heat dissipation capacity thereof tend to be, but if the tab 22 is too thick, the weight of the electrode assembly 20 is increased, so that T2 and T3 are limited to satisfy that T2/T3 is less than or equal to 1 and less than or equal to 4, thereby balancing the increase of the overcurrent capacity and the weight of the tab 22.

According to the battery cell 100 in the embodiment of the application, the size T3 of the tab 22 in the first direction 1 is set to satisfy 1 ≦ T2/T3 ≦ 4, that is, the overcurrent capacity of the tab 22 and the electrode lead-out member 30 is optimized and the heat dissipation performance of the tab 22 and the electrode lead-out member 30 is optimized by controlling the sizes of the tab 22 and the electrode lead-out member 30 in the first direction 1.

According to an embodiment of the first aspect of the present application, the dimension of the supporting member 40 along the first direction 1 is T4, and the dimension of the electrode assembly 20 along the first direction 1 is T5, then T4 and T5 satisfy: 1/3 ≦ T4/T5 ≦ 1.

According to the battery cell 100 of the embodiment of the application, the size T4 of the supporting member 40 along the first direction 1 and the size T5 of the electrode assembly 20 along the first direction 1 are set to satisfy 1/3 ≦ T4/T5 ≦ 1, that is, the size of the electrode assembly 20 in the first direction 1 is set to be greater than or equal to the size of the supporting member 40 along the first direction 1, so that the supporting member 40 can be stably supported on the electrode assembly 20, and the structural stability of the battery cell 100 is further improved.

According to an embodiment of the first aspect of the present application, the body portion 21 includes a first body portion 211 and a second body portion 212, the first body portion 211 and the second body portion 212 are centrosymmetric along the first direction 1, the tab 22 includes a first tab 221 led out from the first body portion 211 and a second tab 222 led out from the second body portion 212, and the first tab 221 and the second tab 222 are disposed in an overlapping manner.

The first body portion 211 and the second body portion 212 have the same structure, and are disposed in a central symmetry along the first direction 1, so that the tab 22 of the first body portion 211 corresponds to the tab 22 of the second body portion 212 in the thickness direction, that is, the first tab 221 and the second tab 222 are disposed to overlap each other.

In other embodiments of the present application, the main body part 21 may further include a third main body part, a fourth main body part, a fifth main body part, and so on, so that the capacity of the battery cell 100 is increased by increasing the number of the main body parts 21.

According to the battery cell 100 of the embodiment of the application, the main body part 21 comprises the first main body part 211 and the second main body part 212, so that the capacity of the battery cell 100 is increased, and the releasable energy of the battery cell 100 in the discharging process is improved; by arranging the first tab 221 to overlap the second tab 222, the first tab 221 and the second tab 222 can be better connected to the electrode lead-out member 30, and the structural reliability is enhanced.

According to an embodiment of the first aspect of the present application, the first tab 221 is located at a side of the first body portion 211 close to the second body portion 212; the second tab 222 is located on one side of the second body portion 212 close to the first body portion 211, and the first tab 221 is connected to the second tab 222.

The first tab 221 is located on the first body portion 211 side closer to the second body portion 212, which means that the first tab 221 is formed at a position closer to the second body portion 212 in the thickness direction. In a possible implementation manner, along the direction from the first main body portion 211 to the second main body portion 212, the size of the tab 22 led out from the multiple pole pieces of the first main body portion 211 gradually decreases, so that, due to the fact that the size of the portion of the tab 22 far away from the second main body portion 212 in the first main body portion 211 is larger, after the multiple tabs 22 are folded, the overall position of the tab 22 can be arranged closer to the second main body portion 212.

The principle of the second tab 222 located on the side of the second main body portion 212 close to the first main body portion 211 is the same, and is not described herein again.

It should be noted that, in the present embodiment, the first tab 221 and the second tab 222 are bundled to be disposed close to each other, so that a connection process can be omitted in a subsequent connection process with the electrode lead-out member 30, and the first tab 221, the second tab 222, and the electrode lead-out member 30 are connected in one process, so as to improve the production efficiency of the battery cell 100.

According to the battery cell 100 of the embodiment of the application, the first tab 221 is located on one side of the first main body portion 211 close to the second main body portion 212, and the second tab 222 is located on one side of the second main body portion 212 close to the first main body portion 211, so that the first tab 221 and the second tab 222 can be arranged close to each other, that is, before the tab 22 is connected with the electrode leading-out piece 30, the first tab 221 and the second tab 222 are flattened once, so that the first tab 221 and the second tab 222 are arranged close to each other, and in the subsequent connection process of the tab 22 and the electrode leading-out piece 30, the first tab 221 and the second tab 222 can be connected with the electrode leading-out piece 30 in one connection process, so that the connection process is saved, and the production efficiency of the battery cell 100 is improved.

According to an embodiment of the first aspect of the present application, the first tab 221 is welded to the second tab 222.

In some embodiments of the present disclosure, the first tab 221 and the second tab 222 may be welded by a laser welding process or an ultrasonic welding process, and the first tab 221, the second tab 222, and the electrode lead 30 are welded in one welding process, so as to improve the integrity and reliability of the electrode assembly 20.

According to the battery cell 100 of the embodiment of the application, the first tab 221 and the second tab 222 are welded, so that the integrity of the tab 22 is effectively improved, and the integrity and reliability of the electrode assembly 20 are further improved.

According to one embodiment of the first aspect of the present application, the electrode lead-out 30 is located on the side of the first tab 221 facing away from the second tab 222, the electrode lead-out 30 being welded to the first tab 221; alternatively, the electrode lead-out 30 is located on the side of the second pole lug 222 facing away from the first pole lug 221, and the electrode lead-out 30 is welded to the second pole lug 222.

In the embodiments of the present application, the electrode lead-out member 30 is disposed on one side of the first tab 221 and the second tab 222 after the first tab 221 and the second tab 222 are retracted, so as to simplify the welding process of the electrode lead-out member 30, and further improve the production efficiency of the battery cell 100.

According to the battery cell 100 of the embodiment of the present application, the electrode lead-out member 30 may be disposed on one side of the tab 22 close to the first tab 221 or one side close to the second tab 222, so that the connection step of the tab 22 and the electrode lead-out member 30 is simplified, and the connection reliability of the electrode lead-out member 30 and the tab 22 is further increased.

According to an embodiment of the first aspect of the present application, each of the first tab 221 and the second tab 222 includes a positive tab 102 and a negative tab 103, the positive tab 102 and the negative tab 103 are symmetrically arranged along a second direction 2, and the second direction 2 intersects with the first direction 1; the support member 40 is disposed adjacent to the cathode tab 102, and/or the support member 40 is disposed adjacent to the anode tab 103.

In some embodiments, the positive electrode tab 102 and the negative electrode tab 103 may be disposed at the same end of the first tab 221 or the second tab 222, that is, the positive electrode tab 102 and the negative electrode tab 103 are led out from the same end of the main body 21, so as to ensure that the positive electrode tab 102 and the negative electrode tab 103 are disposed in a staggered manner; in some embodiments, it may also be provided that the positive electrode tab 102 and the negative electrode tab 103 are located at different ends of the first tab 221 or the second tab 222.

Illustratively, in the present embodiment, the positive electrode tab 102 is led out from one end of the first electrode tab 221 and the second electrode tab 222, and the negative electrode tab 103 is led out from one end of the first electrode tab 221 and the second electrode tab 222 away from the positive electrode tab 102.

The support members 40 are disposed adjacent to the positive electrode tab 102 and/or the support members 40 are disposed adjacent to the negative electrode tab 103, meaning that the number of support members 40 may be one or more to provide support and protection to the positive electrode tab 102 and/or the negative electrode tab 103 using one or more support members 40.

For example, in the embodiment in which the positive electrode tab 102 and the negative electrode tab 103 are drawn from the same end of the body portion 21, only one support member 40 may be provided, and in this case, the electrode lead-out member 30 connected to the positive electrode tab 102 and the electrode lead-out member 30 connected to the negative electrode tab 103 may be drawn out by opening a plurality of through holes 41.

In the embodiment in which the positive electrode tab 102 and the negative electrode tab 103 are drawn from different ends of the body 21, the drawing of the different electrode lead-out members 30 may be achieved by providing a plurality of support members 40.

According to the battery cell 100 of the embodiment of the present application, the support member 40 may provide support for the tab 22 at one or both ends of the electrode assembly 20 by disposing the support member 40 adjacent to the positive electrode tab 102 and/or the support member 40 adjacent to the negative electrode tab 103, so as to further improve the reliability of the battery cell 100.

According to one embodiment of the first aspect of the present application, the housing 10 comprises a metal plastic film.

Illustratively, in some embodiments, the housing 10 may include a nylon layer, a metal layer, and a plastic layer. The nylon layer functions to secure the outer shape of the housing 10 and reduce damage to the housing 10; the metal layer is usually made of metal aluminum, and the function of the metal layer is to prevent water vapor from permeating; the plastic layer is usually made of PP materials, and PP cannot be dissolved or swelled by electrolyte, so that the electrolyte can be effectively prevented from contacting the metal layer, and the metal layer is prevented from being polluted.

According to the battery cell 100 of the embodiment of the application, the casing 10 is provided with the metal plastic film, so that the electrode assembly 20 and the support member 40 are wrapped by the metal plastic film, and the support member 40 can be better supported on the electrode assembly 20 while the airtightness of the battery cell 100 is ensured.

Embodiments of the present application also provide a battery including the battery cell 100 as in any of the preceding embodiments.

Embodiments of the present application further provide an electric device, which includes a battery as set forth in any of the foregoing embodiments, and the battery is used for providing electric energy.

The battery and the electric device both include the battery cell 100 in the above embodiments. The battery cell 100 includes a case 10, an electrode assembly 20, an electrode lead-out 30, and a support member 40, the electrode assembly 20 being received in the case 10 and including a main body portion 21 and tabs 22 led out from end surfaces of the main body portion 21; the electrode lead-out 30 is connected to the tab 22 and extends to the outside of the case 10; the support member 40 is received in the case 10 at a side of the body portion 21 facing the tab 22, the support member 40 being provided with a through hole 41, the electrode lead 30 passing through the through hole 41. That is, the support member 40 provides good support and protection to the tab 22 to enhance the rigidity of the tab 22 region in the electrode assembly 20, thereby increasing the safety and reliability of the tab 22 portion. Therefore, the battery and the power utilization device provided by the embodiment of the application can achieve the technical effects.

According to an embodiment of the present application, as shown in fig. 1 to 5, the embodiment of the present application provides a battery cell 100 including a case 10, an electrode assembly 20, an electrode lead-out 30, and a support member 40.

The housing 10 is a metal plastic film, and in the present embodiment, the metal plastic film is an aluminum plastic film.

The electrode assembly 20 is accommodated in the case 10, and includes a body portion 21 and tabs 22 drawn from end surfaces of the body portion 21. The main body 21 includes a first main body 211 and a second main body 212 which are centrosymmetric, the tab 22 includes a first tab 221 led from the first main body 211 and a second tab 222 led from the second main body 212, and the first tab 221 and the second tab 222 are disposed in an overlapping manner.

It should be noted that the first tab 221 and the second tab 222 are both positive tabs 102 or both negative tabs 103, and the positive tabs 102 and the negative tabs 103 are respectively disposed at two opposite ends of the main body 21.

The electrode lead-out member 30 is welded to the tab 22 to increase the stability of the connection of the tab 22 to the electrode lead-out member 30 and to reinforce the structural stability.

The number of the supporting members 40 is two, and the two supporting members 40 are respectively disposed at two ends of the main body 21 to respectively support and protect the positive electrode tab 102 and the negative electrode tab 103. The two supporting members 40 are respectively provided with a through hole 41, and the electrode leading-out piece 30 connected with the positive electrode tab 102 extends out of the shell from the through hole 41 of one supporting member 40; the electrode lead-out member 30 connected to the negative electrode tab 103 extends out of the case from the through hole 41 of the other support member 40, and the two electrode lead-out members 30 are commonly used for electrical connection with an external device to perform the charging and discharging steps of the battery cell 100.

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

Claims (18)

1. A battery cell, comprising:

a housing;

an electrode assembly housed in the case, including a main body portion and a tab drawn out from an end surface of the main body portion;

an electrode lead-out member connected to the tab and extending to the outside of the case; and

and the supporting member is accommodated in the shell and positioned on one side of the main body part facing the pole lug, the supporting member is provided with a through hole, and the electrode leading-out piece penetrates through the through hole.

2. The battery cell as recited in claim 1 wherein the support member includes a first recess that is recessed from a surface of the support member that faces the main body portion;

at least part of the tab is accommodated in the first recess;

the through hole penetrates through the bottom wall of the first concave part.

3. The battery cell as recited in claim 2, wherein the tab is welded to the electrode lead-out and forms a weld that is received in the first recess.

4. The battery cell as set forth in claim 2, wherein the support member further includes a plurality of support ribs formed extending from the side wall of the first recess and located on both sides of the tab in the first direction.

5. The battery cell as recited in claim 4, wherein orthographic projections of the plurality of support ribs to the bottom wall do not overlap the through-holes.

6. The battery cell as recited in claim 2 wherein the support member further comprises a second recess recessed from a surface of the support member facing away from the body portion;

the second concave part and the first concave part are arranged along a second direction in a staggered mode.

7. The battery cell as recited in claim 1 wherein the support member abuts an end surface of the body portion.

8. The battery cell as recited in claim 1, wherein the through-hole has a dimension T1 in the first direction, and the electrode lead-out member has a dimension T2 in the first direction, and T1 and T2 satisfy: t1 > T2.

9. The battery cell according to claim 8, wherein the dimension of the tab in the first direction is T3, and T2 and T3 satisfy 1 ≦ T2/T3 ≦ 4.

10. The battery cell as recited in claim 8 wherein the dimension of the support member in the first direction is T4 and the dimension of the electrode assembly in the first direction is T5, then T4 and T5 satisfy: 1/3 ≦ T4/T5 ≦ 1.

11. The battery cell as recited in claim 8 wherein the main body portion comprises a first main body portion and a second main body portion, the first main body portion and the second main body portion being centrosymmetric along the first direction,

the tab comprises a first tab led out from the first main body part and a second tab led out from the second main body part, and the first tab and the second tab are arranged in an overlapping mode.

12. The battery cell as recited in claim 11, wherein the first tab is located on a side of the first body portion adjacent to the second body portion;

the second pole lug is positioned on one side of the second main body part close to the first main body part, and the first pole lug is connected with the second pole lug.

13. The battery cell as recited in claim 12 wherein the first tab is welded to the second tab.

14. The battery cell as recited in claim 13, wherein the electrode lead is located on a side of the first tab facing away from the second tab, the electrode lead being welded to the first tab;

or the electrode leading-out piece is positioned on one side, away from the first pole lug, of the second pole lug, and the electrode leading-out piece is welded with the second pole lug.

15. The battery cell as recited in claim 11, wherein the first tab and the second tab each comprise a positive tab and a negative tab, the positive tab and the negative tab are symmetrically disposed along a second direction, and the second direction intersects the first direction;

the support member is disposed proximate to the positive electrode tab, and/or the support member is disposed proximate to the negative electrode tab.

16. The battery cell of claim 1, wherein the housing comprises a metal plastic film.

17. A battery comprising a plurality of cells according to any one of claims 1 to 16.

18. An electrical device comprising the battery of claim 17, wherein the battery is configured to provide electrical energy.

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