CN220934160U - Winding needle, electrode assembly, battery monomer, battery and electric equipment - Google Patents

Abstract

The embodiment of the application provides a winding needle, an electrode assembly, a battery monomer, a battery and electric equipment, which can improve the service performance of the battery. The needle is applied to the battery, and this needle includes: the battery comprises a main body part and a plurality of supporting parts, wherein the first ends of the supporting parts are connected with the main body part, the second ends of the supporting parts extend away from the main body part, and the supporting parts are used for supporting the electric cores of the battery.

Description

Winding needle, electrode assembly, battery monomer, battery and electric equipment

Technical Field

The embodiment of the application relates to the technical field of battery production, in particular to a winding needle, an electrode assembly, a battery monomer, a battery and electric equipment.

Background

In the manufacturing process of the battery, the battery core is usually used for tightly winding the positive pole piece, the negative pole piece and the isolating film of the battery together through winding equipment, so that the battery can bear more energy density in a limited space. Currently, with the continuous development of battery technology, vehicle-mounted power supplies, electric automobiles and the like have higher demands on the service performance of batteries. In the winding process, the design of the winding needle has great influence on the performance of the prepared battery cell.

Therefore, how to provide a winding needle to improve the service performance of the battery has become a technical problem to be solved in the art.

Disclosure of utility model

In view of the above, the embodiment of the application provides a winding needle, an electrode assembly, a battery monomer, a battery and electric equipment, which can improve the service performance of the battery.

In a first aspect, there is provided a winding needle for use with a battery, the winding needle comprising: the battery comprises a main body part and a plurality of supporting parts, wherein the first ends of the supporting parts are connected with the main body part, the second ends of the supporting parts extend away from the main body part, and the supporting parts are used for supporting the electric cores of the battery.

In the embodiment of the application, the winding needle with the supporting part is arranged in the battery and is used for supporting the battery core of the battery, so that the risk of collapse and deformation of the battery core can be effectively reduced in the use process of the battery, the interval consistency of the positive pole piece and the negative pole piece in the battery core is improved, and meanwhile, the winding needle is arranged in the battery core and does not need to be pulled out after winding, so that the risk of wrinkling or powder dropping of the pole piece in the battery core can be reduced, and the use performance of the battery is improved.

In some implementations, the body part includes a plurality of extension parts in the same number as the support parts, the extension parts extending from the outer circumference of the body part toward the same extension direction as the support parts, the inside of the extension parts being provided with an accommodating space provided with an elastic part, one end of the extension parts near the support parts being provided with an opening through which the support parts are connected to the elastic part to move in the extending direction of the support parts.

In the embodiment of the application, the accommodating space is arranged in the extending part, the accommodating space is provided with the elastic part, one end of the extending part, which is close to the supporting part, is provided with the opening, and the supporting part passes through the opening and is connected with the elastic part to move along the extending direction of the supporting part in the accommodating space, so that the tension of the battery cell in the winding process is easy to control, the densification degree of the battery cell is improved, and the energy density of the battery is improved.

In some implementations, each of the plurality of support members is the same size along the direction of extension of the support member. In this way, in the embodiment of the application, the size of each of the plurality of support components along the extending direction of the support component is set to be the same size, so that the structural shape of the battery core formed by the winding needle is regular and controllable, batch production of batteries is easy to realize, and meanwhile, the processing and manufacturing of the winding needle are convenient.

In some implementations, in a cross-section perpendicular to the height of the winding needle, the included angle between any adjacent two of the plurality of support members is equal. In this way, in the embodiment of the application, the included angle between any two adjacent support components in the plurality of support components is set to be equal, so that the structural shape of the battery core formed by the winding needle is regular and controllable, batch production of batteries is easy to realize, and meanwhile, the processing and manufacturing of the winding needle are convenient.

In some implementations, the second end of the support member is configured as an arcuate structure. In this way, in the embodiment of the application, the end, which is contacted with the battery cell, of the supporting component is arranged to be of an arc-shaped structure, so that the damage of the supporting component to the battery cell, such as the isolating film or the pole piece in the battery cell, is reduced, and the service performance of the battery is improved.

In some implementations, the plurality of support members includes six of the support members. In this way, in the embodiment of the application, for example, six supporting components are arranged on the winding needle, on the section perpendicular to the height of the winding needle, the included angle between any two adjacent supporting components in the six supporting components is equal, and the dimension of each supporting component in the six supporting components along the extending direction of the supporting component is the same, so that a regular hexagonal prism-shaped cell can be prepared through the winding needle, meanwhile, the processing and the manufacturing of the winding needle are facilitated, and the production efficiency is improved.

In some implementations, a connecting member is provided between ends of adjacent two of the plurality of support members that are distal from the body member.

In the embodiment of the application, the structural strength of the winding needle can be improved by arranging the connecting part between the end parts, far away from the main body part, of the adjacent two supporting parts, so that the supporting effect of the winding on the battery core is further improved, the risk of collapse and deformation of the battery core is reduced, and the service performance of the battery is improved.

In some implementations, the material of the support member includes at least one of: plastic, ceramic, metal.

In a second aspect, there is provided an electrode assembly comprising a winding needle as described in any one of the implementations of the first aspect above, and a positive electrode tab, a negative electrode tab and a separator wound around the winding needle.

In the embodiment of the application, the electrode assembly is formed by winding the positive electrode plate, the negative electrode plate and the isolating film through the winding needle in any implementation mode of the first aspect, the winding needle can play a supporting role on the electrode assembly, the risk of collapse deformation of the electrode assembly can be effectively reduced in the use process of the battery, the interval consistency of the positive electrode plate and the negative electrode plate in the electrode assembly is improved, meanwhile, the winding needle is arranged in the electrode assembly, and the winding needle does not need to be pulled out after winding, so that the risk of wrinkling or powder dropping of the electrode plate in the electrode assembly can be reduced, and the use performance of the battery is further improved.

In some implementations, the winding pin is disposed at a central position of the electrode assembly in a cross section perpendicular to a height of the electrode assembly. Thus, in the embodiment of the application, the winding needle is arranged at the center of the electrode assembly on the section vertical to the height of the electrode assembly, so that the structural shape of the electrode assembly formed by the winding needle is regularly controllable, and the mass production of the battery is easy to realize.

In some implementations, a surface of the positive pole piece and/or the negative pole piece that is proximate to the winding pin is provided with a crease corresponding to a support member of the winding pin. In this way, in the embodiment of the application, the crease corresponding to the supporting part of the winding needle is arranged on the surface of the positive pole piece and/or the negative pole piece of the battery cell, which is close to the winding needle, so that the winding efficiency of the battery cell is improved, meanwhile, the positive pole piece and the negative pole piece are tightly attached, the densification degree of the battery cell is improved, and the service performance of the battery is improved.

In a third aspect, there is provided a battery cell comprising: the electrode assembly as described in any one of the implementations of the second aspect above.

In some implementations, the battery cell further includes a polygonal-prism-shaped case corresponding to the electrode assembly, an accommodating space is provided inside the case, and the electrode assembly is disposed in the accommodating space.

In some implementations, an insulating layer is disposed between the housing and the electrode assembly.

In some implementations, the shape of the housing and the electrode assembly is a positive polygon prism.

In a fourth aspect, there is provided a battery comprising a battery cell according to any implementation of the third aspect.

In a fifth aspect, a powered device is provided, comprising a battery according to any implementation of the fourth aspect, the battery being configured to provide electrical energy to the powered device.

In some implementations, the powered device may be a vehicle, a vessel, a spacecraft, or the like.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed 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 other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application.

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

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

Fig. 4 is a schematic cross-sectional view of a winding needle according to an embodiment of the present application.

Fig. 5 is a schematic cross-sectional view of a winding needle according to another embodiment of the present application.

Fig. 6 is a schematic cross-sectional view of a winding needle according to still another embodiment of the present application.

Fig. 7 is a schematic cross-sectional view of a winding needle according to still another embodiment of the present application.

Fig. 8 is a schematic cross-sectional view of a winding needle according to still another embodiment of the present application.

Fig. 9 is a schematic cross-sectional view of an electrode assembly according to an embodiment of the present application.

Fig. 10 is a schematic cross-sectional view of a battery cell according to an embodiment of the present application.

Fig. 11 is a schematic cross-sectional view of a battery cell according to another embodiment of the present application.

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

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the 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 embodiments of this application belong; the terminology used in the description of the application 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. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.

Reference in the specification 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 described embodiments of the application may be combined with other embodiments.

In describing embodiments of the present application, it should be noted that the terms "mounted," "connected," and "attached" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example, unless otherwise explicitly indicated and defined; can be directly connected or indirectly connected through an intermediate medium, and can be communication between 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.

In the embodiment of the present application, the term "and/or" is merely an association relationship describing the association object, which 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 "/" in the embodiment of the present application generally indicates that the front and rear association objects are in an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

A battery generally refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery may include a battery module or a battery pack, or the like. Typically, the battery also includes a housing for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

In some implementations, the battery cells may include lithium ion batteries, lithium sulfur batteries, sodium lithium ion batteries, sodium ion batteries, or magnesium ion batteries, and the like, as embodiments of the application are not limited in this respect. Typically, the battery cells may also be referred to as cells. The battery cells may be in the form of cylinders, flats, cuboids, polygonal columns, or other regular or irregular shapes. The technical scheme of the embodiment of the application can be applied to battery cells with any shape, in particular to a polygonal prismatic battery cell.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separation membrane. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the current collector without the positive electrode active material layer protrudes out of the current collector coated with the positive electrode active material layer, and the current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the current collector without the negative electrode active material layer protrudes out of the current collector with the coated negative electrode active material layer, and the current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The material of the separator may be polypropylene (PP) or Polyethylene (PE). In addition, the electrode assembly may be a roll-to-roll structure or a lamination structure, and embodiments of the present application are not limited thereto.

In some implementations, the battery cell includes an end cap on which an electrode terminal of the battery cell is disposed, and an insulating member is disposed between the end cap and the electrode terminal to ensure insulation between the end cap and the electrode terminal, in addition to the electrode assembly. The electrode terminals are electrically connected with the tabs of the electrode assembly through connection members.

Currently, in the manufacturing process of a battery, an electric core is usually used for tightly winding a positive pole piece, a negative pole piece and a separation film of the battery together by using winding equipment, so that the battery can bear more energy density in a limited space. Currently, with the continuous development of battery technology, vehicle-mounted power supplies, electric automobiles and the like have higher demands on the service performance of batteries. In the winding process, the design of the winding needle has great influence on the performance of the prepared battery cell. In the prior art, after the battery core is wound, the winding needle needs to be pulled out from the inside of the winding core, if the friction force between the winding needle and the winding core is large, the isolating film or the pole piece of the inner layer of the winding core can be damaged, and secondly, a cavity formed after the winding core is pulled out can cause the collapse of an internal structure and the polarization of the battery in the working process of the battery, and the problem that the pole piece is wrinkled or powder falls in the use process of the battery is easily caused, so that the service performance of the battery is affected.

In view of the above, an embodiment of the present application provides a winding needle, applied to a battery, including: the battery comprises a main body part and a plurality of supporting parts, wherein the first ends of the supporting parts are connected with the main body part, the second ends of the supporting parts extend away from the main body part, and the supporting parts are used for supporting the electric cores of the battery. Therefore, the risk of collapse deformation of the battery core can be effectively reduced in the use process of the battery, the interval consistency of positive and negative pole pieces inside the battery core is improved, meanwhile, the winding needle is arranged inside the battery core, the winding needle is not required to be pulled out after winding, the risk of wrinkling or powder dropping of the pole pieces inside the battery core can be reduced, and the use performance of the battery is improved.

The technical scheme described by the embodiment of the application is suitable for various electric equipment using batteries.

It should be understood that the electrical devices in embodiments of the present application include, but are not limited to, vehicles, cell phones, portable devices, notebook computers, boats, spacecraft, electric toys, electric tools, and the like. The vehicle can be a fuel oil vehicle, a fuel 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; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others.

For convenience of explanation, the following embodiments take electric equipment as an example of a vehicle.

For example, as shown in fig. 1, a schematic structural diagram of a vehicle 1 according to an embodiment of the present application is shown, where the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, the controller 30 being arranged to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, e.g. the battery 10 may be used as an operating power source for the vehicle 1, for electrical circuitry of the vehicle 1, e.g. for start-up, navigation and operational power requirements of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operating power source for the vehicle 1 but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to supply driving power to the vehicle 1.

For example, as shown in fig. 2, a schematic structure of a battery 10 according to an embodiment of the present application is shown. The battery 10 may include a plurality of battery cells 20. In addition to the battery cells 20, the battery 10 may further include a case 11, the inside of the case 11 being of a hollow structure, and a plurality of battery cells 20 being receivable in the case 11. As shown in fig. 2, the housing 11 may include two portions, referred to herein as a first housing portion 111 and a second housing portion 112, respectively, the first housing portion 111 and the second housing portion 112 being snap-fit together. The shape of the first and second case parts 111 and 112 may be determined according to the shape of the combination of the plurality of battery cells 20, at least one of the first and second case parts 111 and 112 having an opening. For example, as shown in fig. 2, only one of the first case portion 111 and the second case portion 112 is a hollow rectangular parallelepiped having an opening, and the other is a plate-like shape to cover the opening. Here, taking the second case portion 112 as a hollow rectangular parallelepiped and only one face as an opening face, and the first case portion 111 as a plate-like example, the first case portion 111 is covered at the opening of the second case portion 112 to form a case 11 having a closed chamber that can be used to house a plurality of battery cells 20. The plurality of battery cells 20 are connected in parallel, in series or in a combination of series and parallel, and then placed in the case 11 formed by the first case portion 111 and the second case portion 112 after being fastened.

For another example, unlike the embodiment shown in fig. 2, the first case portion 111 and the second case portion 112 may each be hollow rectangular parallelepiped and have only one surface as an opening surface, the opening of the first case portion 111 and the opening of the second case portion 112 are disposed opposite to each other, and the first case portion 111 and the second case portion 112 are fastened to each other to form a case having a closed chamber. The plurality of battery cells 20 are connected in parallel, in series or in a combination of series and parallel, and then placed in the case 11 formed by the first case portion 111 and the second case portion 112 after being buckled.

In some implementations, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus bar member (not shown) for making electrical connection between the plurality of battery cells 20, such as parallel, series, or series-parallel connection. Specifically, the bus member may realize electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. In some embodiments, the bus member may be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 may be further drawn through the housing by a conductive mechanism. In some embodiments, the conductive mechanism may also belong to the bus component.

In order to meet different power requirements, the number of the battery cells 20 may be plural, and the plural battery cells 20 may be connected in series, parallel or series-parallel, wherein series-parallel refers to a mixture of series connection and parallel connection. The battery 10 may also be referred to as a battery pack. In some embodiments, the plurality of battery cells 20 may be connected in series, parallel, or series-parallel to form a battery module, and then connected in series, parallel, or series-parallel to form the battery 10. That is, the plurality of battery cells 20 may be directly assembled into the battery 10, or may be assembled into a battery module, and the battery module may be assembled into the battery 10.

For convenience of explanation, the following describes the technical scheme of the embodiment of the present application, taking the multi-prismatic battery cell 20 shown in fig. 2 as an example. It should be understood that the battery cell 20 of embodiments of the present application may be other than a prismatic battery cell, including but not limited to a prismatic battery cell, a square-case battery cell, or a blade battery cell.

Fig. 3 is a schematic structural diagram of a battery cell 20 according to an embodiment of the application. As shown in fig. 3, the battery cell 20 includes a case 210, an electrode assembly 220, and an end cap assembly 230. The housing 210 and the end cap assembly 230 form an outer shell or battery compartment. The housing 210 is formed of metal, such as aluminum. The case 210 is dependent on the shape of the one or more electrode assemblies 220 combined. For example, the housing 210 may be a hollow hexagonal prism as shown in fig. 3.

As shown in fig. 3, the case 210 has an opening, the electrode assembly 220 is received in the case 210, and the cap assembly 230 is used to cover the opening to house the electrode assembly 220 in the case 210. Housing and protection of the electrode assembly 220 and other components is achieved through the case 210 and the cap assembly 230. The housing 210 is filled with an electrolyte, such as an electrolyte solution. End cap assembly 230 includes a negative end cap assembly 2301 and a positive end cap assembly 2302, with negative end cap assembly 2301 and positive end cap assembly 2302 covering the opening of housing 210 from the ends of housing 210, respectively, to cap electrode assembly 220 within housing 210. A negative end cap assembly 2301 is provided for providing a negative electrode terminal and a positive end cap assembly 2302 is provided for providing a positive electrode terminal. The positive electrode terminal is connected to the positive electrode tab of the electrode assembly 220, and the negative electrode terminal is connected to the negative electrode tab of the electrode assembly 220. The positive and negative electrode terminals may be any number, for example, the battery cell 20 may have two positive electrode terminals disposed on the positive end cap assembly 2302 and two negative electrode terminals disposed on the negative end cap assembly 2301. The positive end cap assembly 2302 is identical in structure to the negative end cap assembly 2301. Hereinafter, the end cap assembly 230 in the embodiment of the present application may be a positive end cap assembly 2302 or a negative end cap assembly 2301.

In the battery cell 20, the electrode assembly 220 may be provided in a single or a plurality according to actual use requirements, for example, as shown in fig. 3, 1 electrode assembly 220 is provided in the battery cell 20.

Fig. 4 is a schematic cross-sectional view of a winding needle 50 according to an embodiment of the present application, fig. 5 is a schematic cross-sectional view of a winding needle 50 according to another embodiment of the present application, wherein fig. 4 and 5 can be understood as schematic cross-sectional views of the same winding needle 50 in different directions, and fig. 4 may be a schematic cross-sectional view of the winding needle 50 perpendicular to a height direction of the winding needle 50, and fig. 5 may be a schematic cross-sectional view of the winding needle 50 in AA' direction in fig. 4.

In some implementations, as shown in fig. 4 and 5, the winding needle 50 is applied to the battery 10, and the winding needle 50 includes: a body member 510 and a plurality of support members 520, a first end of the support member 520 being connected to the body member 510, a second end of the support member 520 extending away from the body member 510, the support member 520 for supporting the cells of the battery 10.

It should be appreciated that in embodiments of the present application, the body member 510 and the support member 520 of the winding needle 50 may be movably or fixedly connected. In some implementations, where the body member 510 is fixedly coupled to the support member 520, the coupling includes, but is not limited to, welding or bonding. In some implementations, the body member 510 and the support member 520 in the winding needle 50 can be integrally formed. It should also be understood that the plurality of support members 520 may refer to 2 or more support members 520.

In the embodiment of the application, the winding needle 50 with the supporting component 520 is arranged in the battery 10, the supporting component 520 is used for supporting the battery cell of the battery 10, the risk of collapse and deformation of the battery cell can be effectively reduced in the use process of the battery 10, the interval consistency of positive and negative pole pieces in the battery cell is improved, meanwhile, the winding needle 50 is arranged in the battery cell, the winding needle is not required to be pulled out after winding, the risk of wrinkling or powder dropping of the pole pieces in the battery cell can be reduced, and the use performance of the battery 10 is further improved.

Fig. 6 illustrates a schematic cross-sectional view of a winding needle 50 according to another embodiment of the present application, fig. 7 illustrates a schematic cross-sectional view of a winding needle 50 according to another embodiment of the present application, wherein fig. 6 and fig. 7 can be understood as schematic cross-sectional views of the same winding needle 50 in different directions, and, for example, fig. 6 can be a schematic cross-sectional view of the winding needle 50 perpendicular to a height direction of the winding needle 50, and fig. 7 can be a schematic cross-sectional view of the winding needle 50 in a BB' direction in fig. 6.

In some implementations, as shown in fig. 6 and 7, the body part 510 includes a plurality of extension parts 530 in the same number as the support parts 520, the extension parts 530 extending from the outer circumference of the body part 510 toward the same extension direction as the support parts 520, the inside of the extension parts 530 being provided with receiving spaces 532, the receiving spaces 532 being provided with elastic parts 540, one end of the extension parts 530 adjacent to the support parts 520 being provided with openings 531, the support parts 520 being connected with the elastic parts 540 through the openings 531 to move in the extension direction of the support parts 520 within the receiving spaces 532.

It should be appreciated that in embodiments of the present application, the resilient member 540 includes, but is not limited to, a metal spring, a rubber gasket, a rubber spring. It should also be appreciated that in some implementations, the interior of the extension 530 may be provided with at least two resilient members 540 along the height of the needle 50, and illustratively, each of the two ends of the extension 530 along the height of the needle 50 may be provided with one resilient member 540.

In the embodiment of the present application, the accommodating space 532 is provided in the extension part 530, the accommodating space 532 is provided with the elastic member 540, the end of the extension part 530 adjacent to the supporting member 520 is provided with the opening 531, and the supporting member 520 is connected with the elastic member 540 through the opening 531 to move along the extending direction of the supporting member 520 in the accommodating space 532, so that the tension of the battery cell in the winding process is easy to control, the densification degree of the battery cell is improved, and the energy density of the battery 10 is improved.

In some implementations, as shown in fig. 4-7, each of the plurality of support members 520 has the same dimension along the extension direction of the support member 520. Thus, in the embodiment of the present application, by setting the dimensions of each of the plurality of support members 520 in the extending direction of the support member 520 to be the same, the structural shape of the battery cell formed by the winding needle 50 is regularly controllable, mass production of the battery 10 is easily achieved, and the processing and manufacturing of the winding needle 50 are facilitated.

In some implementations, as shown in fig. 4 to 7, in a section perpendicular to the height of the winding needle 50, the included angle between any adjacent two of the plurality of support members 520 is equal. Thus, in the embodiment of the present application, by setting the included angles between any two adjacent support members 520 in the plurality of support members 520 to be equal, the structural shape of the electrical core formed by the winding needle 50 is regular and controllable, which is easy to realize mass production of the battery 10, and is convenient for processing and manufacturing the winding needle 50.

In some implementations, as shown in fig. 4-7, the second end of the support member 520 is configured in an arcuate configuration. Thus, in the embodiment of the present application, the end of the supporting member 520 contacting the battery cell is configured as an arc structure, so as to reduce the damage of the supporting member 520 to the battery cell, such as the separator or the pole piece inside the battery cell, and improve the service performance of the battery 10.

In some implementations, the plurality of support members 520 includes six of the support members 520. Thus, in the embodiment of the present application, for example, by providing six support members 520 on the winding needle 50, in a cross section perpendicular to the height of the winding needle 50, the included angle between any two adjacent support members 520 in the six support members 520 is equal, and the dimensions of each support member 520 in the six support members 520 along the extending direction of the support member 520 are set to be the same, so that a regular hexagonal prism-shaped cell can be prepared by the winding needle 50, and meanwhile, the processing and manufacturing of the winding needle 50 are facilitated, and the production efficiency is improved.

Fig. 8 shows a schematic cross-sectional view of a winding needle 50 according to another embodiment of the present application.

In some implementations, as shown in fig. 8, a connection member 550 is provided between ends of adjacent two of the plurality of support members 520 that are remote from the body member 510.

It should be appreciated that in embodiments of the present application, the connection member 550 may be fixedly connected between the ends of two adjacent support members 520 of the plurality of support members 520 remote from the body member 510, such as, but not limited to, welding or bonding.

In the embodiment of the present application, by providing the connection member 550 between the ends of the adjacent two support members 520 of the plurality of support members 520, which are far away from the main body member 510, the structural strength of the winding needle 50 can be improved, so as to further improve the supporting effect of the winding needle 50 on the battery cell, reduce the risk of collapse and deformation of the battery cell, and improve the service performance of the battery 10.

In some implementations, the material of the support member 520 includes at least one of: plastic, ceramic, metal.

Fig. 9 shows a schematic cross-sectional view of an electrode assembly 220 according to another embodiment of the present application.

The embodiment of the present application also provides an electrode assembly 220, as shown in fig. 9, the electrode assembly 220 including the winding needle 50 of any of the above embodiments, and the positive electrode tab, the negative electrode tab, and the separator wound around the winding needle 50.

In the embodiment of the application, the electrode assembly 220 is made by winding the positive electrode sheet, the negative electrode sheet and the separator through the winding needle 50 in any one of the above embodiments, and the winding needle 50 can support the electrode assembly 220, so that the risk of collapse and deformation of the electrode assembly 220 can be effectively reduced in the use process of the battery 10, the consistency of the spacing between the positive electrode sheet and the negative electrode sheet in the electrode assembly 220 is improved, and meanwhile, the winding needle is arranged in the electrode assembly 220 without being pulled out after winding, so that the risk of wrinkling or powder dropping of the electrode sheet in the electrode assembly 220 can be reduced, and the use performance of the battery 10 is further improved.

In some implementations, as shown in fig. 9, the winding needle 50 is disposed at a central position of the electrode assembly 220 in a section perpendicular to the height of the electrode assembly 220. Thus, in the embodiment of the present application, the winding needle 50 is disposed at the center of the electrode assembly 220 in a section perpendicular to the height of the electrode assembly 220, so that the structural shape of the electrode assembly 220 formed by the winding needle 50 is regularly controllable, and mass production of the battery 10 is easily achieved.

In some implementations, the surface of the positive pole piece and/or the negative pole piece that is proximate to the winding pin 50 is provided with folds that correspond to the support members 520 of the winding pin 50. Thus, in the embodiment of the present application, the surface of the positive electrode sheet and/or the negative electrode sheet of the electrode assembly 220, which is close to the winding needle 50, is provided with the crease corresponding to the supporting member 520 of the winding needle 50, so as to improve the winding efficiency of the electrode assembly 220, and meanwhile, the positive electrode sheet and the negative electrode sheet are tightly attached to each other, so that the densification degree of the electrode assembly 220 is improved, and the service performance of the battery 10 is improved.

Fig. 10 illustrates a schematic cross-sectional view of a battery cell 20 according to another embodiment of the present application, and fig. 11 illustrates a schematic cross-sectional view of a battery cell 20 according to another embodiment of the present application, wherein fig. 10 and 11 may be understood as schematic cross-sectional views of the same battery cell 20 in different directions, and, for example, fig. 10 may be a schematic cross-sectional view of the battery cell 20 perpendicular to a height direction of the battery cell 20, and fig. 11 may be a schematic cross-sectional view of the battery cell 20 in the CC' direction in fig. 10.

Embodiments of the present application also provide a battery cell 20 including an electrode assembly 220 according to any of the embodiments described above.

In some implementations, as shown in fig. 10 and 11, the battery cell 20 further includes a polygonal-shaped case 210 corresponding to the electrode assembly 220, an accommodating space is provided inside the case 210, and the electrode assembly 220 is disposed in the accommodating space.

In the embodiment of the application, the polygonal prismatic shell 210 corresponding to the electrode assembly 220 is arranged in the battery cell 20, and the electrode assembly 220 is arranged in the accommodating space of the polygonal prismatic shell 210, so that the space utilization rate inside the battery cell 20 can be improved, the energy density of the point battery cell 20 is improved, and meanwhile, when a plurality of battery cells 20 are connected into a battery module, the space utilization rate inside a battery pack can be effectively improved, and the combined battery module has better structural stability.

In some implementations, as shown in fig. 10 and 11, an insulating layer 560 is provided between the case 210 and the electrode assembly 220.

In some implementations, as shown in fig. 10 and 11, the case 210 and the electrode assembly 220 are in the shape of a regular polygon prism. Specifically, the battery may be the battery 10 shown in fig. 1 above.

The embodiment of the application also provides a battery, which comprises the battery cell 20 in any embodiment.

The embodiment of the application also provides electric equipment, which comprises the battery 10 in any embodiment, wherein the battery 10 is used for providing electric energy for the electric equipment. Specifically, the electric device may be the vehicle 1 shown in fig. 1, or any electric device using the battery 10.

Referring again to fig. 6 and 7 above, in some implementations, there is provided a winding needle 50, the winding needle 50 including a main body part 510 and six support parts 520, the main body part 510 including six extension parts 530, the extension parts 530 extending from an outer circumference of the main body part 510 toward the same extending direction as the support parts 520, an accommodating space 532 being provided inside the extension parts 530, the accommodating space 532 being provided with an elastic part 540, one end of the extension parts 530 near the support parts 520 being provided with an opening 531, the support parts 520 being connected with the elastic part 540 through the opening 531 to move in the extending direction of the support parts 520 in a section perpendicular to the height of the winding needle 50, an included angle between any adjacent two of the six support parts 520 being 60 °, and a dimension of each of the six support parts 520 along the extending direction of the support parts 520 being the same.

While the application has been described with reference to the above embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the embodiments of the application. 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 (16)

1. A winding needle for use with a battery, the winding needle comprising:

A main body part (510) and a plurality of support parts (520), the first end of support part (520) is connected with main body part (510), the second end of support part (520) extends towards the direction of keeping away from main body part (510), support part (520) is used for supporting the electric core of battery.

2. The winding needle according to claim 1, characterized in that the main body part (510) includes a plurality of extension parts (530) in the same number as the support parts (520), the extension parts (530) extend from the outer circumference of the main body part (510) toward the same extending direction as the support parts (520), the inside of the extension parts (530) is provided with a housing space (532), the housing space (532) is provided with an elastic part (540), one end of the extension parts (530) near the support parts (520) is provided with an opening (531), and the support parts (520) are connected with the elastic part (540) through the opening (531) to move in the housing space (532) along the extending direction of the support parts (520).

3. The winding needle according to claim 2, characterized in that each of the plurality of support members (520) has the same dimension along the extending direction of the support member (520).

4. A winding needle according to claim 2, characterized in that in a section perpendicular to the height of the winding needle, the angle between any adjacent two of the support members (520) of the plurality of support members (520) is equal.

5. The winding needle according to claim 2, characterized in that the second end of the support member (520) is arranged in an arc-shaped configuration.

6. The winding needle according to claim 4, wherein the plurality of support members (520) comprises six support members (520).

7. Needle according to any one of claims 1 to 6, characterized in that a connecting member (550) is provided between the ends of adjacent two of the plurality of support members (520) remote from the body member (510).

8. An electrode assembly comprising the winding needle of any one of claims 1 to 7, and a positive electrode tab, a negative electrode tab, and a separator wound around the winding needle.

9. The electrode assembly according to claim 8, wherein the winding needle is disposed at a central position of the electrode assembly in a section perpendicular to a height of the electrode assembly.

10. The electrode assembly according to claim 8, wherein a surface of the positive electrode tab and/or the negative electrode tab, which is close to the winding needle, is provided with a crease corresponding to a supporting member (520) of the winding needle.

11. A battery cell comprising an electrode assembly according to any one of claims 8 to 10.

12. The battery cell according to claim 11, further comprising a polygonal-shaped case corresponding to the electrode assembly, wherein an accommodation space is provided inside the case, and the electrode assembly is disposed in the accommodation space.

13. The battery cell of claim 12, wherein an insulating layer is disposed between the housing and the electrode assembly.

14. The battery cell of claim 12, wherein the housing and the electrode assembly are in the shape of a regular polygon.

15. A battery comprising a cell according to any one of claims 11 to 14.

16. A powered device comprising the battery of claim 15, the battery to provide electrical energy to the powered device.