Battery monomer, battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery monomer, a battery device and electric equipment. The battery cell comprises: an electrode assembly including a diaphragm, the electrode assembly being wound to form a central through hole; the central needle is arranged in the central through hole, and the electrode assembly is wound on the central needle; wherein the central needle comprises a first supporting body and a second supporting body, the first supporting body and the second supporting body are oppositely arranged and are used for surrounding the peripheral side of the winding needle, and the first supporting body and the second supporting body are used for clamping a diaphragm. According to the technical scheme, the heat dissipation efficiency of the battery monomer can be improved, and the use stability of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] The part provided in this part is only background information related to the present disclosure, which is not necessarily prior art.

[0003] At present, battery devices are divided into hard-shell batteries, soft-pack batteries and cylindrical batteries in terms of form. Among them, cylindrical batteries are valued due to high volume energy density, simple structure, easy grouping, and the advantages of being easy to standardize.

[0004] In related technologies, the electrode assembly of the cylindrical battery is usually inserted into the center needle to support the center through hole formed after the electrode assembly is wound in the later winding period, which occupies the space of the center through hole, thereby affecting the heat dissipation efficiency. UTILITY MODEL CONTENT

[0005] The purpose of the present application is to provide a battery monomer, a battery device and an electric equipment to realize the heat dissipation efficiency of the battery monomer and improve the use stability of the battery monomer. The purpose is achieved by the following technical solutions:

[0006] In a first aspect, the present application provides a battery monomer, comprising: an electrode assembly comprising a separator, the electrode assembly being wound to form a center through hole; a center needle, the center needle being arranged in the center through hole, and the electrode assembly being wound on the center needle; wherein the center needle comprises a first support body and a second support body, the first support body and the second support body are arranged oppositely and used to surround the outer circumferential side of the winding needle, and the first support body and the second support body are used to clamp the separator.

[0007] According to the battery monomer provided by the present application, the center needle is arranged as a two-part structure, i.e. the first support body and the second support body, which are used to clamp the starting end of the separator simultaneously with the winding needle before winding the electrode assembly, and rotate synchronously with the winding needle to wind the electrode assembly. After winding is completed, the first support body and the second support body are supported in the center through hole formed by winding the electrode assembly, so as to form an integrated structure with the electrode assembly, without the need to insert the center needle in the later winding period, thereby reducing the risk of displacement of the separator and the anode and cathode electrode sheets of the electrode assembly caused by the insertion of the center needle in the later period, which helps to improve the stability and safety of the use of the battery monomer. In addition, since the first support body and the second support body can form an integrated structure with the electrode assembly after winding the electrode assembly, the center needle of the present application does not occupy the space of the center through hole compared with the way of inserting the center needle in the center through hole of the electrode assembly in the later period, thereby also helping to improve the heat dissipation efficiency of the battery monomer.

[0008] In addition, the battery cell provided in the present application can also have the following additional technical features:

[0009] In some embodiments of the present application, the center needle is configured to be detachably connected with the winding needle.

[0010] The center needle is connected with the winding needle when winding the electrode assembly, and can be detached from the winding needle after the winding of the electrode assembly is completed, so as to be supported in the center through hole formed after the winding of the electrode assembly, thereby reducing the risk of collapse of the electrode assembly.

[0011] In some embodiments of the present application, at least one first connecting part is arranged on the side of the winding needle facing the center needle, and at least one second connecting part is arranged on the side of the center needle facing the winding needle, and the second connecting part is used for detachable connection with the first connecting part.

[0012] At least one second connecting part, i.e. the first supporting body or the second supporting body, or both the first supporting body and the second supporting body, is arranged on the side of the center needle facing the winding needle, and the second connecting part can be detachably connected with the first connecting part of the winding needle, so that the center needle can be connected with the winding needle before winding the electrode assembly, so that the center needle and the winding needle rotate synchronously to wind the electrode assembly, and can be detached from the winding needle after the winding is completed, so as to form an integrated structure with the electrode assembly.

[0013] In some embodiments of the present application, one of the first connecting part and the second connecting part comprises a clamping protrusion, and the other comprises a clamping groove, and the clamping protrusion is used for clamping connection with the clamping groove.

[0014] That is, at least one clamping protrusion is arranged on the winding needle, and at least one clamping groove is arranged on the center needle, and when the first supporting body and the second supporting body of the center needle are arranged on the outer circumferential side of the winding needle and clamped on both sides of the thickness direction of the diaphragm, the clamping protrusion can be clamped with the clamping groove, so that the winding needle can drive the center needle to rotate synchronously when the winding needle rotates, so as to wind the electrode assembly at the same time, and the structure and principle are relatively simple and easy to realize.

[0015] In some embodiments of the present application, the clamping protrusion and the clamping groove both extend along the axis direction of the center needle.

[0016] The clamping protrusion and the clamping groove both extend along the axis direction of the center needle, and the first supporting body and the second supporting body can make the clamping protrusion inserted into or detached from the clamping groove when moving along the length direction of the winding needle, and the structure and principle are relatively simple and easy to realize.

[0017] In some embodiments of the present application, the first supporting body and / or the second supporting body is / are provided with at least one through hole.

[0018] By arranging at least one through hole in the first support body or the second support body, or arranging at least one through hole in both the first support body and the second support body, the through hole can play a role in guiding the flow of heat. Specifically, the battery monomer generates heat during the charging and discharging process, and part of the heat can enter the inner circumferential side of the center needle through the through hole and be dissipated from the channel defined by the inner circumferential side, thereby improving the heat dissipation efficiency of the battery monomer.

[0019] In some embodiments of the present application, the first support body and / or the second support body is a metal piece.

[0020] By arranging at least one of the first support piece and the second support piece as a metal piece, the metal piece has good heat conduction performance, which helps to further improve the heat dissipation capacity of the battery monomer.

[0021] In some embodiments of the present application, an insulating layer is arranged between the first support body, the second support body and the diaphragm.

[0022] By arranging an insulating layer between the first support body, the second support body and the diaphragm, the center needle and the diaphragm can be insulated, thereby reducing the risk of short circuit between the internal components of the battery monomer.

[0023] In some embodiments of the present application, a heat-conducting adhesive layer is arranged on the side of the first support body and / or the second support body facing the electrode assembly.

[0024] By arranging a heat-conducting adhesive layer on the side of the first support body or the second support body facing the electrode assembly, or arranging a heat-conducting adhesive layer on the side of the first support body and the second support body away from the winding needle, the heat-conducting adhesive layer not only can bond the electrode assembly and the center needle to improve the reliability of the connection between the center needle and the electrode assembly, but also can play a role in heat conduction, thereby further improving the heat dissipation efficiency.

[0025] In some embodiments of the present application, the first support body and the second support body are both semicircular ring structures in the projection plane perpendicular to the extension direction of the center needle.

[0026] In the projection plane perpendicular to the extension direction of the center needle, the first support body and the second support body are both semicircular ring structures, which not only helps to improve the stability during winding the electrode assembly, but also has a relatively simple structure, is easy to process and form, is suitable for mass production, and is also easy to install and disassemble, which helps to improve the production efficiency of the product.

[0027] In some embodiments of the present application, the first support body has two first clamping surfaces for clamping the diaphragm, and the second support body has two second clamping surfaces for clamping the diaphragm, the second clamping surfaces being arranged correspondingly to the first clamping surfaces; wherein the first clamping surfaces and the second clamping surfaces are respectively provided with first magnetic attraction members and second magnetic attraction members, the first magnetic attraction members and the second magnetic attraction members being arranged to clamp the diaphragm in a mutually magnetic attraction manner.

[0028] By arranging the first magnetic attraction members and the second magnetic attraction members on the first clamping surfaces and the second clamping surfaces respectively, when the first support body and the second support body are clamped on both sides of the diaphragm in the thickness direction, the first magnetic attraction members and the second magnetic attraction members can be mutually magnetically attracted to improve the reliability of clamping the diaphragm, thereby improving the stability of the electrode assembly during winding, and further helping to improve the production quality of the product.

[0029] In some embodiments of the present application, the first support body and the second support body are arranged symmetrically along the radial direction of the center needle.

[0030] The first support body and the second support body are arranged symmetrically along the diameter direction of the center needle and are used to clamp the diaphragm in cooperation with each other, which helps to improve the stability of clamping the diaphragm, and makes the structure of the center needle as a whole more regular, which helps to further improve the stability of the electrode assembly during winding.

[0031] In some embodiments of the present application, the diaphragm extends from one side of the diameter direction of the center needle between the first support body and the second support body, and extends to the other side of the diameter direction of the center needle.

[0032] It can be understood that the winding needle has a clamping slot for clamping the diaphragm, along the extension direction of the clamping slot, the starting end of the diaphragm extends from one side of the radial direction of the center needle and then passes through the clamping slot until it extends to the other side of the radial direction of the center needle, so that the center needle can completely clamp the diaphragm, thereby reducing the risk of the diaphragm falling off during winding, to help improve the stability of the electrode assembly during winding.

[0033] In some embodiments of the present application, the electrode assembly further comprises a positive electrode sheet and a negative electrode sheet, the diaphragm is arranged between the positive electrode sheet and the negative electrode sheet, and at least two turns of the diaphragm are wound between the positive electrode sheet and / or the negative electrode sheet and the center needle.

[0034] That is, before winding the positive electrode sheet and the negative electrode sheet, the diaphragm is pre-wound at least two turns on the outer peripheral side of the center needle, and then the positive electrode sheet and the negative electrode sheet are wound, to reduce the risk of short circuit caused by the positive electrode sheet and the negative electrode sheet contacting the center needle.

[0035] In some embodiments of the present application, the positive electrode sheet comprises a positive electrode current collector, the positive electrode current collector comprises a coated region and tab regions located on both sides of the width of the coated region, the coated region is coated with a positive electrode active material, and a projection of the coated region on the center needle is located on the center needle in the diameter direction of the center needle.

[0036] That is, the setting length of the center needle is not less than the width of the coated region in the axial direction of the center needle (the width direction of the coated region), and the projection of the coated region on the center needle is located on the center needle in the diameter direction of the center needle, so that the center needle can completely support the coated region of the positive electrode current collector, thereby reducing the risk of collapse of the coated region of the positive electrode current collector, and further helping to improve the stability and reliability of the center needle supporting the electrode assembly, thereby improving the stability of the battery cell in use.

[0037] In a second aspect, the present application provides a battery device comprising the battery cell according to any one of the embodiments of the first aspect.

[0038] The battery device provided by the embodiments of the second aspect of the present application comprises the battery cell according to any one of the embodiments of the first aspect, and thus has the technical effects of any one of the above embodiments, which will not be repeated here.

[0039] In a third aspect, the present application provides a power consuming device comprising the battery device according to the embodiments of the second aspect, wherein the battery device is used to power the power consuming device.

[0040] The power consuming device provided by the embodiments of the third aspect of the present application comprises the battery device according to the embodiments of the second aspect, and thus also has the technical effects of any one of the above embodiments, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0041] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the present application. Moreover, the same reference numerals are used throughout the drawings to represent similar or same components. In the drawings:

[0042] Figure 1 A structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0043] Figure 2 An exploded structural schematic diagram of a battery device provided by some embodiments of the present application;

[0044] Figure 3 An exploded structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0045] Figure 4An assembly structure diagram of a battery cell provided for some embodiments of the present application;

[0046] Figure 5 An assembly structure diagram of a center needle and a winding needle provided for some embodiments of the present application;

[0047] Figure 6 An assembly structure diagram of a center needle and a winding needle provided for some embodiments of the present application; Figure 5 An assembly structure diagram of a center needle and a winding needle provided for some embodiments of the present application;

[0048] Figure 7 An assembly structure diagram of a center needle and a winding needle provided for some embodiments of the present application.

[0049] The reference signs are as follows:

[0050] 1000, a vehicle;

[0051] 100, a battery device; 200, a controller; 300, a motor; 400, a winding needle; 401, a clamping protrusion;

[0052] 10, a battery cell; 11, a shell; 12, an end cover; 121, a liquid injection hole; 13, an electrode assembly; 14, a center needle; 141, a first support; 1411, a through hole; 1412, a clamping groove; 142, a second support; 15, a sealing member;

[0053] 20, a battery box; 21, a first box body; 22, a second box body. DETAILED DESCRIPTION

[0054] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0056] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0057] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0058] In the description of the embodiments of the application, the term“and / or” is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character“ / ” herein generally represents an“or” relationship between the front and rear associated objects.

[0059] In the description of the embodiments of the application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0060] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the application.

[0061] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0062] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery device, the demand of its market is also increasing.

[0063] Battery devices are divided into hard-shell batteries, soft-pack batteries and cylindrical batteries in terms of morphology. Cylindrical batteries are valued due to high volume energy density, simple structure, easy grouping, and ease of standardization.

[0064] In related technologies, the electrode assembly of the cylindrical battery will form a center through hole after being wound into a shape. Therefore, a center needle is usually inserted in the later winding stage to support the center through hole. However, due to the small diameter of the center through hole, the insertion of the center needle in the later stage not only occupies the space of the center through hole, thereby affecting heat dissipation, but also can cause the displacement of the separator and the positive and negative electrode sheets of the electrode assembly, thereby causing internal short circuit problems of the battery monomer.

[0065] In order to solve the problem of low heat dissipation efficiency and affect the use stability of the battery monomer caused by the insertion of the center needle in the later winding stage, the application designs a battery monomer. A center needle is provided before winding the electrode assembly. The center needle includes a first support body and a second support body. The first support body and the second support body are spaced apart and oppositely arranged, and are clamped on both sides of the thickness direction of the separator of the electrode assembly. The first support body and the second support body are arranged on the outer circumferential side of the winding needle and are detachably connected with the winding needle. The center needle can be wound with the winding needle at the same time, and is separated from the winding needle after the electrode assembly is wound into a shape, so as to support in the center through hole of the electrode assembly. Since the center needle does not need to be inserted in the later winding stage, the risk of displacement of the electrode assembly is reduced, and the heat dissipation efficiency of the battery monomer is improved, and the risk of short circuit of the battery monomer is reduced, thereby improving the use stability of the battery monomer.

[0066] The battery device disclosed in the embodiments of the application can be used in electric equipment such as vehicles, ships or aircraft, etc. The power supply system of the electric equipment can be composed of the battery monomer and the battery disclosed in the application. In this way, the risk of expansion and deformation or damage of the battery monomer is reduced, and the use stability of the battery device is improved.

[0067] The embodiments of the application provide a power-using equipment using a battery as a power supply. The power-using equipment can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0068] The following embodiments are described with reference to a power-using equipment as a vehicle 1000 in an embodiment of the application for convenience of description.

[0069] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery apparatus 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery apparatus 100 can be used for power supply of the vehicle 1000, for example, the battery apparatus 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery apparatus 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0070] In some embodiments of the present application, the battery apparatus 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0071] Referring to Figure 2 , Figure 2 A disassembled structural schematic diagram of a battery apparatus is provided for some embodiments of the present application. The battery apparatus 100 (Battery Apparatus) mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) can include a plurality of battery cells 10 connected in series, in parallel, or in a mixed connection through busbar components.

[0072] In some embodiments, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells 10.

[0073] As an example, the battery cell assembly can be a battery module (Battery Module), which is formed by arranging and fixing a plurality of battery cells 10 into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 10 with a cable tie.

[0074] In some embodiments, the battery apparatus 100 can be a battery pack (Battery Pack), which includes a box body and one or more battery cell assemblies accommodated in the box body.

[0075] As an example, the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0076] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells 10 in the box body.

[0077] As an example, the battery box 20 can include a first box body 21 and a second box body 22. The first box body 21 and the second box body 22 are fastened so that an enclosed space is formed inside the battery box 20 to accommodate the battery cell assembly. The enclosed here means covered or closed, which can be sealed or unsealed. The first box body 21 can be an end cover or a bottom plate.

[0078] As an example, the battery box 20 can include an end cover, a frame and a bottom plate. The end cover and the bottom plate are connected with the frame respectively so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0079] In some embodiments, the battery box 20 can be part of the chassis structure of the vehicle 1000. For example, part of the box can be at least part of the bottom plate of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0080] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells 10, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, such as aircraft, rockets, space shuttles and spacecraft.

[0081] Please refer to Figure 3 and Figure 4 , Figure 3 the exploded view of the battery cell provided by some embodiments of the present application; Figure 4 the assembly structure diagram of the battery cell provided by some embodiments of the present application. The battery cell 10 provided by the embodiments of the present application includes an electrode assembly 13 and a center needle 14. The electrode assembly 13 includes a separator, and the electrode assembly 13 is wound to form a center through hole; the center needle 14 is arranged in the center through hole, and the electrode assembly is wound on the center needle 14; the center needle 14 includes a first support body 141 and a second support body 142, the first support body 141 and the second support body 142 are arranged oppositely and used for surrounding the outer circumferential side of the winding needle, and the first support body 141 and the second support body 142 are used for cooperatively clamping the separator.

[0082] As an example, the battery cell 10 is a cylindrical battery cell.

[0083] In some embodiments, the electrode assembly 13 includes a positive electrode sheet, a separator and a negative electrode sheet arranged in sequence, and the positive electrode sheet, the separator and the negative electrode sheet are wound to form an integrated structure. During the charging and discharging process of the battery cell 10, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the short circuit of the positive electrode and the negative electrode, and at the same time, the active ions can pass through.

[0084] It can be understood that the inner circumferential side of the electrode assembly 13 after being wound and formed can be formed with a center through hole.

[0085] The positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0086] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0087] As an example, the positive electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. can be employed.

[0088] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0089] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0090] As an example, the negative electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. can be employed.

[0091] In some embodiments, the battery cell 10 further includes a shell, which can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. The shell is used to package components such as the electrode assembly 13 and the electrolyte. The shell includes an end cover 12 and a shell body 11, the shell body 11 is provided with an opening, and the end cover 12 is provided on the opening. The shell body 11 can be provided with one or more openings. The end cover 12 can also be provided with one or more.

[0092] In some embodiments, the end cover 12 is provided with a liquid injection hole 121, and the liquid injection hole 121 is sealed by a sealing member 15.

[0093] By setting the center needle 14 as a two-part structure of the first support body 141 and the second support body 142, the first support body 141 and the second support body 142 are used to clamp one end of the separator before winding the electrode assembly 13, and the first support body 141 and the second support body 142 can be connected with the winding needle 400 to rotate synchronously with the winding needle 400 to wind the electrode assembly 13. After winding is completed, the first support body 141 and the second support body 142 can be separated from the winding needle 400 and supported in the center through hole formed after winding the electrode assembly 13, so as to form an integrated structure with the electrode assembly 13, without the need to insert the center needle 14 in the later stage, thereby reducing the risk of displacement of the separator and the anode and cathode electrode sheets of the electrode assembly 13 caused by the insertion of the center needle 14 in the later stage, and helping to improve the stability and safety of the battery monomer 10. In addition, since the first support body 141 and the second support body 142 can form an integrated structure with the electrode assembly 13 after winding the electrode assembly 13, the center needle 14 of the present application does not occupy the space of the center through hole relative to the mode of inserting the center needle 14 into the center through hole 1411 of the electrode assembly 13 in the later stage, thereby also helping to improve the heat dissipation efficiency of the battery monomer 10.

[0094] According to some embodiments of the present application, the center needle 14 is configured to be detachably connected with the winding needle 400.

[0095] The center needle 14 can be connected with the winding needle 400 when winding the electrode assembly 13, and can be separated from the winding needle 400 after winding of the electrode assembly is completed, so as to be supported in the center through hole formed after winding the electrode assembly 13, thereby reducing the risk of collapse of the electrode assembly 13.

[0096] According to some embodiments of the present application, the winding needle 400 is provided with at least one first connecting portion on the side facing the center needle, and the center needle 14 is provided with at least one second connecting portion on the side facing the winding needle 400, and the second connecting portion is used to detachably connect with the first connecting portion.

[0097] Exemplarily, one of the first connecting portion and the second connecting portion can be a sliding rail, and the other can be a sliding groove, both of which are arranged along the axis direction of the center needle 14 and are connected with the sliding groove. Alternatively, one of the first connecting portion and the second connecting portion is a first tooth, and the other is a second tooth, and the first tooth is engaged with the second tooth.

[0098] By setting at least one second connecting part, i.e., the first support body 141 or the second support body 142, or both the first support body 141 and the second support body 142, on the side of the central needle 14 facing the winding needle 400, the second connecting part can be detachably connected with the first connecting part of the winding needle 400, so that the central needle 14 can be connected with the winding needle 400 before winding the electrode assembly 13, so that the central needle 14 rotates synchronously with the winding needle 400 to wind the electrode assembly 13, and can be separated from the winding needle 400 after winding is completed, so as to form an integrated structure with the electrode assembly 13.

[0099] Please see Figure 5 to Figure 7 , Figure 5 The assembly structure schematic diagram of the central needle 14 and the winding needle 400 provided for some embodiments of the present application is shown in the figure. Figure 6 For Figure 5 The cross-sectional structure schematic diagram of A-A direction in the figure. Figure 7 The structure schematic diagram of the first support body 141 provided for some embodiments of the present application is shown in the figure. According to some embodiments of the present application, one of the first connecting part and the second connecting part includes a clamping protrusion 401, and the other includes a clamping groove 1412, and the clamping protrusion 401 is used for clamping connection with the clamping groove 1412.

[0100] That is, at least one clamping protrusion 401 is arranged on the winding needle 400, and at least one clamping groove 1412 is arranged on the central needle 14, and when the first support body 141 and the second support body 142 of the central needle 14 are arranged around the outer circumferential side of the winding needle 400 and clamped on both sides of the thickness direction of the diaphragm, the clamping protrusion 401 can be clamped with the clamping groove 1412, so that the central needle 14 can be driven to rotate synchronously with the winding needle 400 when the winding needle 400 rotates, so as to simultaneously wind the electrode assembly 13, and the structure and principle are relatively simple and easy to realize.

[0101] According to some embodiments of the present application, the clamping protrusion 401 and the clamping groove extend along the axis direction of the central needle.

[0102] The clamping protrusion 401 and the clamping groove extend along the axis direction of the central needle, and when the first support body 141 and the second support body 142 move along the length direction of the winding needle 400, the clamping protrusion 401 can be inserted into or separated from the clamping groove 1412, and the structure and principle are relatively simple and easy to realize.

[0103] According to some embodiments of the present application, the first support body 141 and / or the second support body 142 is / are provided with at least one through hole 1411.

[0104] Exemplarily, the first support body 141 and the second support body 142 are both provided with the through hole 1411, and the number of the through holes 1411 is multiple.

[0105] By arranging at least one through hole 1411 on the first support body 141 and the second support body 142, the through hole 1411 can play a role in guiding the flow of heat. Specifically, the battery monomer 10 will generate heat during the charging and discharging process, and part of the heat can enter the inner circumferential side of the center needle 14 through the through hole 1411 and be dissipated from the channel defined by the inner circumferential side, thereby improving the heat dissipation efficiency of the battery monomer 10.

[0106] According to some embodiments of the present application, the first support body 141 and / or the second support body 142 are metal pieces.

[0107] Exemplarily, the first support body 141 and the second support body 142 can be metal pieces such as copper, iron, stainless steel, etc. The metal pieces have good heat conduction performance, which helps to improve the heat dissipation capacity of the battery monomer 10.

[0108] According to some embodiments of the present application, an insulating layer is arranged between the first support body 141 and / or the second support body 142 and the diaphragm.

[0109] As an example, the insulating layer can be an insulating film or an insulating paint, etc.

[0110] By arranging the insulating layer between the first support body 141 and / or the second support body 142 and the diaphragm, the center needle 14 and the diaphragm can be insulated, thereby reducing the risk of short circuit between the internal components of the battery monomer 10.

[0111] According to some embodiments of the present application, the side of the first support body 141 and / or the second support body 142 away from the winding needle 400 is provided with a heat-conducting adhesive layer.

[0112] As an example, the heat-conducting adhesive layer can be a resin adhesive layer.

[0113] By arranging the heat-conducting adhesive layer on the side of the first support body 141 or the second support body 142 away from the winding needle 400, or arranging the heat-conducting adhesive layer on the side of the first support body 141 and the second support body 142 away from the winding needle 400, the heat-conducting adhesive layer not only can bond the electrode assembly 13 and the center needle 14 to improve the reliability of the connection between the center needle 14 and the electrode assembly 13, but also can play a role in heat conduction, thereby further improving the heat dissipation efficiency.

[0114] Please refer to Figure 5 to Figure 7 According to some embodiments of the present application, the first support body 141 and the second support body 142 are both semicircular ring structures in the orthogonal projection of the projection plane perpendicular to the extension direction of the center needle 14.

[0115] The first support body 141 and the second support body 142 are both semi-circular ring structures in a projection plane perpendicular to the extension direction of the center needle 14, which helps to improve the stability during winding of the electrode assembly 13, and the first support body 141 and the second support body 142 can define a heat dissipation channel between them for discharging heat generated by the battery cell, which has a relatively simple structure, is convenient for processing and molding, is suitable for mass production, and is convenient for installation and disassembly, which helps to improve the production efficiency of the product.

[0116] According to some embodiments of the present application, the first support body 141 has two first clamping surfaces for clamping the diaphragm, and the second support body 142 has two second clamping surfaces for clamping the diaphragm, and the second clamping surfaces are arranged correspondingly to the first clamping surfaces; wherein the first clamping surfaces and the second clamping surfaces are respectively provided with first magnetic attraction members and second magnetic attraction members, and the first magnetic attraction members and the second magnetic attraction members are arranged to clamp the diaphragm in a mutually magnetic attraction manner.

[0117] By arranging the first magnetic attraction members and the second magnetic attraction members on the first clamping surfaces and the second clamping surfaces respectively, when the first support body 141 and the second support body 142 are clamped on both sides of the diaphragm in the thickness direction, the first magnetic attraction members and the second magnetic attraction members can be mutually magnetically attracted to improve the reliability of clamping the diaphragm, thereby improving the stability during winding of the electrode assembly 13, and further helping to improve the production quality of the product.

[0118] According to some embodiments of the present application, the first support body 141 and the second support body 142 are symmetrically arranged along the radial direction of the center needle 14.

[0119] It can be understood that the first support body 141 and the second support body 142 are symmetrically arranged, and the orthographic projections of the first support body 141 and the second support body 142 in the projection plane perpendicular to the extension direction of the center needle 14 are both semi-circular ring structures, so that the thicknesses of the first support body 141 and the second support body 142 are equal and uniform. In this way, when the first support body 141 and the second support body 142 are used to clamp the starting section of the diaphragm in cooperation, there is no misalignment between the first support body 141 and the second support body 142, which helps to improve the stability of clamping the diaphragm, and makes the structure of the center needle 14 as a whole relatively regular, which helps to further improve the stability of the winding process of the electrode assembly.

[0120] According to some embodiments of the present application, the diaphragm extends from one side of the diameter direction of the center needle 14 to between the first support body 141 and the second support body 142, and extends to the other side of the diameter direction of the center needle 14.

[0121] Exemplarily, the length of the diaphragm extending from one side of the diameter direction of the center needle 14 to the other side of the diameter direction of the center needle 14 is arranged in the range of 3mm-5mm.

[0122] It can be understood that the winding needle 400 has a clamping gap for clamping the diaphragm, two clamping gaps are defined between the first support body 141 and the second support body 142, the two clamping gaps and the clamping gap are located in the same plane, and are located on opposite sides of the clamping gap respectively. Along the extension direction of the clamping gap, the starting end of the diaphragm is inserted into the clamping gap on one side of the center needle 14 and then passes through the clamping gap, and is then stretched out of the clamping gap on the other side of the center needle 14, so as to reduce the risk of the diaphragm falling off during winding, thereby helping to improve the stability of the electrode assembly 13 during winding.

[0123] According to some embodiments of the present application, the electrode assembly 13 further comprises a positive electrode sheet and a negative electrode sheet, and the diaphragm is arranged between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet and / or the negative electrode sheet is / are wound with at least two turns of the diaphragm.

[0124] That is, before winding the positive electrode sheet and the negative electrode sheet, the diaphragm is wound at least two turns on the outer circumferential side of the center needle 14 in advance, and then the positive electrode sheet and the negative electrode sheet are wound, so as to reduce the risk of short circuit caused by the positive electrode sheet and the negative electrode sheet contacting the center needle 14.

[0125] According to some embodiments of the present application, the positive electrode sheet comprises a positive electrode current collector, the positive electrode current collector comprises a coated area and a tab area located on both sides of the width of the coated area, and the coated area is coated with a positive electrode active material, wherein, along the diameter direction of the center needle, the projection of the coated area on the center needle 14 is located on the center needle 14.

[0126] It can be understood that the tab area forms the tab of the electrode assembly through a cutting process.

[0127] That is, along the axis direction of the center needle 14 (the width direction of the coated area), the setting length of the center needle 14 is not less than the width of the coated area, and along the diameter direction of the center needle 14, the projection of the coated area on the center needle 14 is located on the center needle 14, so that the center needle 14 can completely support the coated area of the positive electrode current collector, thereby reducing the risk of collapse of the coated area of the positive electrode current collector, and helping to improve the stability and reliability of the center needle 14 supporting the electrode assembly 13, thereby improving the stability of the battery cell in use.

[0128] According to some embodiments of the present application, referring to Figure 3 to Figure 7The application provides a battery monomer 10, which comprises a shell 11, an electrode assembly 13 and a center needle 14. The shell 11 has a containing cavity; the electrode assembly 13 is contained in the containing cavity and comprises a diaphragm, and the electrode assembly 13 is configured to be formed by winding; the center needle 14 comprises a first support body 141 and a second support body 142, the first support body 141 and the second support body 142 are oppositely arranged and used for surrounding the outer circumferential side of a winding needle 400, the first support body 141 and the second support body 142 are respectively clamped on two sides of the thickness direction of the diaphragm, the center needle 14 has a clamping groove 1412 used for detachable connection with a clamping convex of the winding needle 400, and the center needle 14 is used for being connected with the winding needle 400 and winding the electrode assembly 13, and is configured to be able to be separated from the winding needle 400 to be supported on the center through hole. Through the technical scheme of the application, the heat dissipation effect of the battery monomer 10 can be improved, and the use stability of the battery monomer 10 is improved.

[0129] The above is only the preferred specific embodiment of the application, but the protection scope of the application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery cell and a battery device. The battery cell comprises: an electrode assembly comprising a separator, the electrode assembly being wound to form a center through hole; a center needle arranged in the center through hole, the electrode assembly being wound on the center needle; 2. The battery cell of claim 1, wherein, wherein the center needle comprises a first support body and a second support body, the first support body and the second support body are oppositely arranged and used for surrounding the outer circumferential side of the winding needle, and the first support body and the second support body are used for clamping the separator.

3. The battery cell of claim 2, wherein at least one first connecting portion is provided on a side of the winding pin toward the center pin. The center needle is configured to be detachably connected with the winding needle.

4. The battery cell of claim 3, wherein, At least one second connecting part is arranged on the side of the center needle facing the winding needle, and the second connecting part is used for detachable connection with the first connecting part.

5. The battery cell of claim 4, wherein, One of the first connecting part and the second connecting part comprises a clamping protrusion, and the other comprises a clamping groove, and the clamping protrusion is used for clamping connection with the clamping groove.

6. The battery cell of any one of claims 1-5, wherein, The clamping protrusion and the clamping groove both extend along the axial direction of the center needle.

7. The battery cell of any one of claims 1-5, wherein, The first support body and / or the second support body are provided with at least one through hole.

8. The battery cell of claim 7, wherein, The first support body and / or the second support body are metal pieces.

9. The battery cell of any one of claims 1-5, wherein, Insulating layers are arranged between the first support body, the second support body and the separator.

10. The battery cell of any one of claims 1-5, wherein, A heat-conducting adhesive layer is arranged on the side of the first support body and / or the second support body facing the electrode assembly.

11. The battery cell of claim 10, wherein, The first support body and the second support body are both half-circular ring structures in the orthogonal projection of the projection plane perpendicular to the extension direction of the center needle. The first support body has two first clamping surfaces for clamping the separator, and the second support body has two second clamping surfaces for clamping the separator, and the second clamping surfaces are oppositely arranged with the first clamping surfaces.

12. The battery cell of any one of claims 1-5, wherein, The first clamping surfaces and the second clamping surfaces are respectively provided with first magnetic attraction members and second magnetic attraction members, and the first magnetic attraction members and the second magnetic attraction members are arranged in a manner of mutual magnetic attraction to clamp the separator.

13. The battery cell of any one of claims 1-5, wherein, The first support body and the second support body are symmetrically arranged along the radial direction of the center needle.

14. The battery cell of any one of claims 1-5, wherein, The separator extends from one side in the diameter direction of the center needle to between the first support body and the second support body, and extends to the other side in the diameter direction of the center needle.

15. The battery cell of claim 14, wherein, The electrode assembly further comprises a positive electrode sheet and a negative electrode sheet, the separator is arranged between the positive electrode sheet and the negative electrode sheet, and at least two turns of the separator are wound between the positive electrode sheet and / or the negative electrode sheet and the center needle. The positive electrode sheet comprises a positive electrode current collector, the positive electrode current collector comprises a coating area and tab areas located on both sides of the width of the coating area, and the coating area is coated with a positive electrode active material.

16. A battery device characterized by comprising: In the diameter direction of the center needle, the projection of the coating area on the center needle is located on the center needle.

17. An electrical device, characterized by The battery device comprises the battery cell as claimed in any one of claims 1-15. The battery device is used for supplying power to the power-consuming equipment.

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