Pole piece, battery and electric equipment

Abstract

The pole piece comprises a pole piece body, the pole piece body comprises a dressing area and an empty foil area which are sequentially arranged along a first direction, the dressing area is provided with an active material layer, the empty foil area is provided with a diversion trench, and the diversion trench is used for circulating electrolyte. According to the application, the flow guide groove is formed in the empty foil area between the tab and the dressing area, and the flow guide groove can be used for circulating the electrolyte after the pole piece is wound, so that the diffusion rate of the electrolyte in the tab area is improved, and the manufacturing capability of liquid injection and aging procedures is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pole piece, a battery and an electrical device. Background Art

[0002] Batteries are divided into two types according to their internal manufacturing process and structural features: wound and laminated. Laminated batteries are made up of multiple layers of cathode and anode sheets in parallel, and each electrode sheet can lead to a pole ear, so the battery has low internal resistance and excellent rate performance. Wound batteries have high production efficiency and are easy to automate, but they cannot lead to a pole ear on each layer like laminated batteries. The stacked structure of the battery core with layers tightly fitted to each other slows down the electrolyte infiltration speed, reducing the manufacturing capacity of the battery injection and aging processes. Utility Model Content

[0003] The purpose of this application is to provide an electrode, a battery and an electrical device to solve the problem of difficulty in electrolyte diffusion.

[0004] To achieve the purpose of this application, this application provides the following technical solutions:

[0005] In a first aspect, the present application provides a pole piece, comprising:

[0006] The pole piece body comprises a dressing area and an empty foil area sequentially arranged along a first direction, the dressing area is provided with an active material layer, and the empty foil area is provided with a guide groove for circulating electrolyte.

[0007] In one embodiment, a plurality of the guide grooves are provided, and the plurality of the guide grooves are sequentially spaced apart along a second direction, and the second direction is different from the first direction.

[0008] In one embodiment, the number of the guide grooves is at least three, and the at least three guide grooves include a first guide groove, a second guide groove, and a third guide groove arranged in sequence in the second direction, the distance between the first guide groove and the second guide groove in the second direction is L1, the distance between the second guide groove and the third guide groove in the second direction is L2, and L1 is greater than or less than L2.

[0009] In one implementation, the difference between L1 and L2 is a fixed value.

[0010] In one embodiment, at least three of the guide grooves further include a fourth guide groove...an (n-1)th guide groove and an nth guide groove, the first guide groove, the second guide groove, the third guide groove, the fourth guide groove...the (n-1)th guide groove and the nth guide groove are arranged in sequence in the second direction, the distance between the third guide groove and the fourth guide groove in the second direction is L3, the distance between the (n-1)th guide groove and the nth guide groove in the second direction is L n ;

[0011] Among them, L2-L1=L3-L2=...=L n -L (n-1) .

[0012] In one embodiment, the electrode piece also includes a pole ear, which is arranged at one end of the empty foil area away from the dressing area in the first direction, and the end surface of the empty foil area away from the dressing area in the first direction is recessed to form a groove wall of the guide groove, and the groove wall of the guide groove surrounds a groove opening.

[0013] In one embodiment, a plurality of the pole ears are provided, and the plurality of the pole ears are spaced apart in a second direction, the second direction is different from the first direction, and the width of the guide groove in the second direction is smaller than the spacing between two adjacent pole ears in the second direction.

[0014] In one embodiment, in the first direction, an end of the guide groove away from the electrode tab is spaced apart from the active material layer.

[0015] In one embodiment, in the first direction, a distance between an end of the guide groove away from the electrode tab and the active material layer is greater than or equal to 1 mm.

[0016] In one embodiment, the pole piece body of the empty foil area includes a first part and a second part arranged in sequence along a second direction, the second direction is perpendicular to the first direction, a plurality of the pole ears are arranged on the second part, and the guide grooves are provided on both the first part and the second part.

[0017] In a second aspect, the present application provides a battery, comprising a positive electrode sheet, a negative electrode sheet and a separator arranged between the positive electrode sheet and the negative electrode sheet, wherein the positive electrode sheet and / or the negative electrode sheet adopts the electrode sheet according to the first aspect, and the positive electrode sheet, the separator and the negative electrode sheet are stacked.

[0018] In one embodiment, the positive electrode sheet, the separator and the negative electrode sheet are wound to form a winding core, and a flow inlet channel connected to the flow guide groove is provided in the winding core. In one embodiment, a plurality of flow guide grooves are provided on the positive electrode sheet and / or the negative electrode sheet, and the plurality of flow guide grooves on the positive electrode sheet are connected and / or the plurality of flow guide grooves on the negative electrode sheet are connected to form a flow guide channel, and the flow guide channel is connected to the flow inlet channel.

[0019] In one embodiment, a plurality of the guide grooves are arranged at intervals along the winding direction of the winding core, and the distance between two adjacent guide grooves gradually increases from the starting end to the ending end of the winding of the winding core.

[0020] In one embodiment, the plurality of guide grooves are sequentially the first guide groove, the second guide groove, the third guide groove, the fourth guide groove...the (n-1)th guide groove and the nth guide groove in the second direction, the second direction is different from the first direction, the spacing between the first guide groove and the second guide groove in the second direction is L1, the spacing between the second guide groove and the third guide groove in the second direction is L2, the spacing between the third guide groove and the fourth guide groove in the second direction is L3, the spacing between the (n-1)th guide groove and the nth guide groove in the second direction is L n ;

[0021] Among them, L2-L1=L3-L2=...=L n -L (n-1) =2π*H;

[0022] H=the thickness of the negative electrode sheet+the thickness of the positive electrode sheet+the thickness of the separator*2.

[0023] In one embodiment, the battery further comprises a shell, a first end cover and a second end cover, wherein the first end cover and the second end cover are connected to two ends of the shell in an axial direction, and the first end cover is provided with a first injection hole;

[0024] The winding core is accommodated in the shell, and the inlet channel is communicated with the first liquid injection hole.

[0025] In one embodiment, the battery further comprises a first current collecting plate and a second current collecting plate, the first current collecting plate is provided with a second liquid injection hole, the second current collecting plate is provided with a third liquid injection hole, and the inlet channel is connected with the second liquid injection hole and the third liquid injection hole;

[0026] The positive electrode sheet includes a positive electrode ear, and the first current collecting plate is connected between the first end cover and the positive electrode ear;

[0027] The negative electrode sheet includes a negative electrode ear, and the second current collecting plate is connected between the second end cover and the negative electrode ear.

[0028] In a third aspect, the present application further provides an electrical device, comprising the battery according to the second aspect.

[0029] In the present application, a guide groove is provided on the empty foil area between the electrode tab and the dressing area. The guide groove can be used to circulate the electrolyte after the electrode sheet is wound, thereby increasing the diffusion rate of the electrolyte in the electrode tab area and improving the manufacturing capacity of the injection and aging processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a schematic structural diagram of a positive electrode sheet, a separator and a negative electrode sheet in an unfolded state according to an embodiment of the present application;

[0032] Figure 2 This is a schematic diagram of the structure of a pole piece according to an embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of the structure of a positive electrode sheet and a negative electrode sheet when they are stacked and unfolded according to an embodiment of the present application;

[0034] Figure 4 A cross-sectional view of a battery according to an embodiment of the present application;

[0035] Figure 5 This is a schematic structural diagram of another embodiment of the present application when the positive electrode sheet and the negative electrode sheet are stacked and unfolded;

[0036] Figure 6 A cross-sectional view of a battery according to another embodiment of the present application;

[0037] Figure 7 It is a schematic structural diagram of the empty foil area and the pole ear of the pole piece body according to one embodiment of the present application.

[0038] Description of reference numerals:

[0039] 100, diaphragm; 200, pole piece; 210, pole piece body; 211, dressing area; 212, empty foil area; 212a, first part; 212b, second part; 213, guide groove; 213a, first guide groove; 213b, second guide groove; 213c, third guide groove; 213d, fourth guide groove; 220, pole ear; 300, inlet channel; 400, guide channel; 500, shell; 600, first end cover; 610, first injection hole; 700, second end cover; 710, pole; 800, first collecting plate; 810, second injection hole; 900, second collecting plate; 910, third injection hole. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0043] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] The present application provides an electric device, including a mobile phone, a tablet computer, a sweeper and an electric vehicle, which can be powered by a built-in battery so as to work without an external power supply. The battery of the electric device can be a lithium-ion battery, a sodium-ion battery or a nickel-metal hydride battery.

[0045] refer to Figure 1The present application provides a battery, the battery includes a positive electrode sheet, a negative electrode sheet and a separator, the separator is arranged between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the separator and the negative electrode sheet are stacked. The electrolyte is an ion conductor in the battery, which is responsible for transferring ions between the positive and negative electrodes, thereby maintaining the charging and discharging process of the battery.

[0046] In the prior art, the stacked structure of the battery core in which the layers are tightly fitted together slows down the infiltration rate of the electrolyte, thereby reducing the manufacturing capacity of the battery injection and aging processes.

[0047] refer to Figure 2 The present application provides a pole piece 200, which includes a pole piece body 210 and a pole ear 220. The pole piece body 210 includes a dressing area 211 and an empty foil area 212 arranged in sequence along a first direction. The dressing area 211 is provided with an active material layer, and the empty foil area 212 is provided with a guide groove 213, which is used to circulate electrolyte; the pole ear 220 is arranged at one end of the empty foil area 212 away from the dressing area 211 in the first direction. The empty foil area 212 of the pole piece body 210 is the remaining part after cutting the pole ear 220, which can prevent the diaphragm 100 or the dressing area 211 from being stabbed after the pole ear 220 is flattened, and provides a cutting space for the guide groove 213. The pole ear 220 can be obtained by laser die cutting, which plays a role in connecting the circuit.

[0048] In the present application, a guide groove 213 is provided on the empty foil area 212 between the pole ear 220 and the dressing area 211. The guide groove 213 can be used to circulate the electrolyte after the pole piece 200 is wound, thereby increasing the diffusion rate of the electrolyte in the pole ear 220 area and improving the manufacturing capacity of the injection and aging processes.

[0049] It should be noted that the electrode 200 provided in the present application can be a positive electrode or a negative electrode in a battery. When the electrode 200 is a positive electrode, the active materials on the dressing area 211 include but are not limited to transition metal oxides, polyanion compounds, Prussian blue compounds, etc., such as lithium cobalt oxide, lithium iron phosphate, sodium iron pyrophosphate, etc.; when the electrode 200 is a negative electrode, the active materials on the dressing area 211 include but are not limited to graphite, hard carbon or silicon, etc.

[0050] Optionally, the shape of the tab 220 and the guide groove 213 can be a parallelogram, a trapezoid, a rhombus, a circle, etc., and the edges of the tab 220 and the guide groove 213 can be processed with rounded corners or chamfers. The cutting process of the guide groove 213 can be carried out simultaneously with the cutting process of the tab 220, without adding additional process steps, which is conducive to controlling the process time cost.

[0051] In the embodiment of the present application, the X direction is taken as the first direction and the Y direction is taken as the second direction for description, and the X direction is different from the Y direction.

[0052] refer to Figure 2 , Figure 3 and Figure 4 In the battery, the positive electrode sheet, the separator 100 and the negative electrode sheet are wound to form a winding core, and the winding core has an inlet channel 300 extending along the axial direction of the winding core. After the positive electrode sheet, the separator 100 and the negative electrode sheet are wound, a hollow area is formed at the center of the winding core. The hollow area axially penetrates both ends of the winding core to form the inlet channel 300, and the guide groove 213 is connected to the inlet channel 300. The pole ear 220 is located at one end of the winding core along the first direction X, and the guide groove 213 is provided on the empty foil area 212. After the electrolyte is injected into the winding core, the electrolyte can flow to the pole ear 220 through the guide groove 213 to increase the diffusion rate of the electrolyte.

[0053] In the pole piece 200 provided in the present application, a plurality of pole tabs 220 are provided, and the plurality of pole tabs 220 are spaced apart in the second direction Y to reduce the damage to the structure of the pole tab 220 caused by metal debris generated during the pre-pressing and flattening process of the pole tab 220. A plurality of guide grooves 213 are provided, and the plurality of guide grooves 213 are spaced apart in sequence along the second direction Y. Specifically, the width of the guide groove 213 in the second direction Y is less than the spacing between two adjacent pole tabs 220 in the second direction Y to ensure the connection strength between the pole tab 220 and the empty foil area 212. In the Kia embodiment, the width of the guide groove 213 in the second direction Y may also be greater than the spacing between two adjacent pole tabs 220 in the second direction Y.

[0054] Among them, the number of guide grooves 213 is set to at least three, and the at least three guide grooves 213 include a first guide groove 213a, a second guide groove 213b and a third guide groove 213c arranged in sequence in the second direction Y, the spacing between the first guide groove 213a and the second guide groove 213b in the second direction Y is L1, and the spacing between the second guide groove 213b and the third guide groove 213c in the second direction Y is L2, L1 is greater than or less than L2, that is, the spacing between every two guide grooves 213 in the multiple guide grooves 213 in the second direction Y is different, so that after the pole piece 200 is wound, the multiple guide grooves 213 can be connected to form a guide channel 400 for electrolyte circulation, so that the electrolyte flows to the multiple pole ears 220, so as to further improve the diffusion rate of the electrolyte in the pole ear 220 area.

[0055] In one embodiment, the difference between L1 and L2 is a fixed value, and after the pole piece 200 is wound, a plurality of guide grooves 213 are arranged at intervals along the winding direction of the winding core, and the spacing between two adjacent guide grooves 213 gradually increases from the starting end to the ending end of the winding core. That is, any two adjacent guide grooves 213 are arranged according to this rule, so that the plurality of guide grooves 213 can be connected to form a guide channel 400 for the electrolyte to flow.

[0056] refer to Figure 3 and Figure 4In one embodiment, the negative electrode sheet of the battery adopts the electrode sheet 200 of the present application, and multiple guide grooves 213 form a guide channel 400 after the electrode sheet 200 is wound. The guide channel 400 is connected to the inlet channel 300. The electrolyte flows into the guide channel 400 through the inlet channel 300, so that the electrolyte flows to the multiple pole ears 220 to further improve the diffusion rate of the electrolyte in the pole ear 220 area.

[0057] refer to Figure 5 and Figure 6 In another embodiment, the positive electrode sheet and the negative electrode sheet of the battery both adopt the electrode sheet 200 of the present application, and two guide channels 400 are formed in the winding core. The two guide channels 400 are both connected to the inlet channel 300 to further improve the electrolyte diffusion rate in the electrode ear 220 area of ​​the positive electrode sheet and the electrode ear 220 area of ​​the negative electrode sheet.

[0058] In the pole piece 200 provided in the present application, the at least three guide grooves 213 also include a fourth guide groove 213d...the (n-1)th guide groove and the nth guide groove, the first guide groove 213a, the second guide groove 213b, the third guide groove 213c, the fourth guide groove 213d...the (n-1)th guide groove and the nth guide groove are arranged in sequence in the second direction Y, the spacing between the third guide groove 213c and the fourth guide groove 213d in the second direction Y is L3, the spacing between the (n-1)th guide groove and the nth guide groove in the second direction Y is L n ; Among them, L2-L1=L3-L2=……=L n -L (n-1) Specifically, L2-L1=L3-L2=...=L n -L (n-1) =2π*H, H=thickness of negative electrode sheet + thickness of positive electrode sheet + thickness of diaphragm 100*2, i.e. L2-L1, L3-L2, ..., L n -L (n-1) The difference between L1, L2, L3...L n It is an arithmetic progression, so that after the electrode 200 is wound, each turn of the electrode 200 has and only has one guide groove 213, all the guide grooves 213 can be aligned after winding, and multiple guide grooves 213 are interconnected to form a guide channel 400 for the electrolyte.

[0059] In the present application, the distance between the plurality of guide grooves 213 is specified so as to reduce the number of guide grooves 213 to be cut, thereby ensuring the mechanical strength of the pole piece on the side of the pole tab 220 and preventing the pole tab 220 from bending, collapsing or other failure problems.

[0060] Optionally, the end surface of the empty foil area 212 away from the dressing area 211 in the first direction X is recessed to form the groove wall of the guide groove 213, and the groove wall of the guide groove 213 forms a notch, so that after multiple pole pieces 200 are wound and the pole ears 220 are flattened, the electrolyte can flow along the guide groove 213 or the guide channel 400 to the pole ears 220.

[0061] In the pole piece 200 provided in the present application, in the first direction X, the end of the guide groove 213 away from the pole ear 220 has a distance from the active material layer. Specifically, the distance between the end of the guide groove 213 away from the pole ear 220 and the active material layer is ≥ 1 mm, so as to ensure the structural strength of the pole piece 200 and prevent the dressing area 211 from being damaged during the cutting process of the guide groove 213.

[0062] refer to Figure 5 and Figure 7 , the pole piece body 210 of the empty foil area 212 includes a first part 212a and a second part 212b sequentially arranged along the second direction Y, a plurality of pole ears 220 are arranged on the second part 212b, and a guide groove 213 is arranged on the first part 212a and the second part 212b. Specifically, no pole ear 220 is arranged on the first part 212a to ensure that the outer edge of the innermost pole ear 220 does not block the inlet channel 300 after the pole piece 200 is wound; and the distance between the first guide groove 213 and the leftmost end of the pole piece 200 should be less than the length of the first turn of the pole piece 200, so that there is at least one guide groove 213 in the first turn after the pole piece 200 is wound.

[0063] In the battery provided in the present application, the battery further includes a shell 500, a first end cover 600, a second end cover 700, a first current collecting plate 800 and a second current collecting plate 900. The first end cover 600 and the second end cover 700 are connected to the two ends of the shell 500 in the axial direction. The first end cover 600 is provided with a first injection hole 610. The winding core is accommodated in the shell 500, and the inlet channel 300 is connected with the first injection hole 610. The first current collecting plate 800 is provided with a second injection hole 810, and the second current collecting plate 900 is provided with a third injection hole 910. The inlet channel 300 is connected with the second injection hole 810 and the third injection hole 910. The positive electrode sheet includes a positive electrode ear 220, and the first current collecting plate 800 is connected between the first end cover 600 and the positive electrode ear 220. The negative electrode sheet includes a negative electrode ear 220, and the second current collecting plate 900 is connected between the second end cover 700 and the negative electrode ear 220. Specifically, the first end cover 600 is connected to the housing 500 by laser welding, and the second end cover 700 is connected to the pole 710 by laser welding. The pole 710 and the housing 500 need to be insulated, and the second end cover 700 and the housing 500 also need to be insulated. The first collector plate 800 and the pole lug 220, and the second collector plate 900 and the pole lug 220 are connected by laser welding to play a conductive role.

[0064] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0065] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A pole piece, characterized in that: include: An electrode body, the electrode body comprising a dressing area and an empty foil area sequentially arranged along a first direction, the dressing area is provided with an active material layer, the empty foil area is provided with a guide groove, and the guide groove is used to circulate electrolyte; The electrode piece also includes a pole ear, which is arranged at one end of the empty foil area away from the dressing area in the first direction. The end surface of the empty foil area away from the dressing area in the first direction is recessed to form a groove wall of the guide groove, and the groove wall of the guide groove surrounds a groove opening.

2. The pole piece according to claim 1, characterized in that: A plurality of guide grooves are provided, and the plurality of guide grooves are arranged at intervals along a second direction, and the second direction is different from the first direction.

3. The pole piece according to claim 2, characterized in that: The number of the guide grooves is at least three, and the at least three guide grooves include a first guide groove, a second guide groove and a third guide groove arranged in sequence in the second direction, the distance between the first guide groove and the second guide groove in the second direction is L1, the distance between the second guide groove and the third guide groove in the second direction is L2, and L1 is greater than or less than L2.

4. The pole piece according to claim 3, characterized in that: The difference between L1 and L2 is a fixed value.

5. The pole piece according to claim 3, characterized in that: The at least three guide grooves further include a fourth guide groove...an (n-1)th guide groove and an nth guide groove, the first guide groove, the second guide groove, the third guide groove, the fourth guide groove...the (n-1)th guide groove and the nth guide groove are sequentially arranged in the second direction, the distance between the third guide groove and the fourth guide groove in the second direction is L3, the distance between the (n-1)th guide groove and the nth guide groove in the second direction is L n ; Among them, L2-L1=L3-L2=...=L n -L (n-1) .

6. The pole piece according to claim 1, characterized in that: There are multiple pole ears, and the multiple pole ears are spaced apart in a second direction, the second direction is different from the first direction, and the width of the guide groove in the second direction is smaller than the distance between two adjacent pole ears in the second direction.

7. The pole piece according to claim 1, characterized in that: In the first direction, an end of the guide groove away from the electrode tab is spaced apart from the active material layer.

8. The pole piece according to claim 7, characterized in that: In the first direction, a distance between an end of the guide groove away from the electrode tab and the active material layer is greater than or equal to 1 mm.

9. The pole piece according to claim 1, characterized in that: The pole piece body of the empty foil area includes a first part and a second part sequentially arranged along a second direction, the second direction is perpendicular to the first direction, a plurality of pole ears are arranged on the second part, and the guide grooves are provided on the first part and the second part.

10. A battery, characterized in that: It comprises a positive electrode sheet, a negative electrode sheet and a separator arranged between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet and / or the negative electrode sheet adopts the electrode sheet according to any one of claims 1 to 9, and the positive electrode sheet, the separator and the negative electrode sheet are stacked.

11. The battery according to claim 10, characterized in that The positive electrode sheet, the separator and the negative electrode sheet are wound to form a winding core, and a flow inlet channel communicating with the guide groove is provided in the winding core.

12. The battery according to claim 11, characterized in that The positive electrode sheet and / or the negative electrode sheet are provided with a plurality of the guide grooves, the plurality of the guide grooves on the positive electrode sheet are connected and / or the plurality of the guide grooves on the negative electrode sheet are connected to form a guide channel, and the guide channel is connected to the inlet channel.

13. The battery according to claim 12, characterized in that The plurality of guide grooves are arranged at intervals along the winding direction of the winding core, and the distance between two adjacent guide grooves gradually increases from the winding starting end to the winding ending end of the winding core.

14. The battery according to claim 13, characterized in that The plurality of guide grooves are sequentially the first guide groove, the second guide groove, the third guide groove, the fourth guide groove...the (n-1)th guide groove and the nth guide groove in the second direction, the second direction is different from the first direction, the spacing between the first guide groove and the second guide groove in the second direction is L1, the spacing between the second guide groove and the third guide groove in the second direction is L2, the spacing between the third guide groove and the fourth guide groove in the second direction is L3, the spacing between the (n-1)th guide groove and the nth guide groove in the second direction is L n ; Among them, L2-L1=L3-L2=...=L n -L (n-1) =2π*H; H=the thickness of the negative electrode sheet+the thickness of the positive electrode sheet+the thickness of the separator*2.

15. The battery according to claim 11, characterized in that The battery further comprises a shell, a first end cover and a second end cover, wherein the first end cover and the second end cover are connected to two ends of the shell in an axial direction, and the first end cover is provided with a first liquid injection hole; The winding core is accommodated in the shell, and the inlet channel is communicated with the first liquid injection hole.

16. The battery according to claim 15, characterized in that The battery further comprises a first current collecting plate and a second current collecting plate, the first current collecting plate is provided with a second liquid injection hole, the second current collecting plate is provided with a third liquid injection hole, and the inlet channel is connected with the second liquid injection hole and the third liquid injection hole; The positive electrode sheet includes a positive electrode ear, and the first current collecting plate is connected between the first end cover and the positive electrode ear; The negative electrode sheet includes a negative electrode ear, and the second current collecting plate is connected between the second end cover and the negative electrode ear.

17. An electrical equipment, characterized in that: Comprising a battery according to any one of claims 10-16.

Images