Battery and electrical device

Abstract

A battery and an electrical device. A first current collecting plate (2) is disposed at an end of a winding core (1) along a first direction, and is electrically connected to the winding core (1), the first current collecting plate (2) being provided with at least one through hole penetrating along the first direction. A housing (4) accommodates the winding core (1). A top cover (3) is located at one side of the first current collecting plate (2) along the first direction, a separation space (6) is provided between the top cover (3) and the first current collecting plate (2), and the top cover (3) is provided with a second through hole (301) in communication with the separation space (6). At least one of the top cover (3) and the first current collecting plate (2) partially protrudes towards the other, and the two are in contact. The first current collecting plate (2) and / or the top cover (3) are designed to have an irregularly shaped structure, the first current collecting plate (2) and the top cover (3) are in contact with each other so as to maintain an electrical connection, and the top cover (3) is electrified, which helps to improve the corrosion resistance of the battery. By means of providing a separation space (6) between the top cover (3) and the first current collecting plate (2), after an electrolyte is injected from at least one through hole, the separation space (6) ensures that the electrolyte fully passes through the at least one through hole, thereby solving the problems of improving battery corrosion resistance, and ensuring that a winding core (1) is impregnated by the electrolyte.

Description

Batteries and electrical equipment Technical Field

[0001] The present application relates to the field of battery production technology, and in particular to a battery and electrical equipment. Background Art

[0002] Cylindrical batteries are increasingly being used in the power sector due to their numerous advantages, including low cost, high structural strength, and high energy density. Companies have already begun extensively producing large cylindrical batteries. However, the structure of cylindrical batteries varies from manufacturer to manufacturer. Considering the injection process, the electrolyte is typically injected through the top cover. The design of the top cover must not only ensure that the core is wetted with electrolyte but also enhance the battery's corrosion resistance. Therefore, improving the battery's corrosion resistance and ensuring that the core is wetted with electrolyte have become important technical challenges for those skilled in the art.

[0003] Summary of the Invention

[0004] In view of this, the present application provides a battery and an electrical device to solve the problem in the related art of how to improve the corrosion resistance of the battery and ensure that the core is infiltrated with electrolyte.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A battery comprises: a winding core; a first current collecting disk, arranged at an end of the winding core along a first direction and electrically connected to the winding core, and provided with at least one through hole extending along the first direction; a shell, accommodating the winding core; a top cover, located on one side of the first current collecting disk along the first direction, having a spacing space between the top cover and the first current collecting disk and provided with a second through hole communicating with the spacing space, wherein at least one of the top cover and the first current collecting disk partially protrudes toward the other and contacts the other.

[0007] Optionally, the at least one through hole includes a plurality of third through holes spaced apart around the center of the first collecting plate, and the plurality of third through holes are in communication with the interval space.

[0008] Optionally, multiple third through holes are offset from the center of the first collecting disk and are arranged opposite to the local winding core. The sum of the effective passing areas of the multiple third through holes is S1, the total area of ​​the side of the first collecting disk facing the winding core is S, the capacitance of the winding core is C, and S, S1, and C satisfy 1 / 100≤S1 / (S*√C)≤1 / 20.

[0009] An electrical device comprising the battery described above.

[0010] The battery provided herein comprises a first current collecting disc disposed at an end of a winding core along a first direction and electrically connected to the winding core, and having at least one through-hole extending therethrough in the first direction; a housing accommodating the winding core; and a top cover disposed on one side of the first current collecting disc along the first direction and having a second through-hole extending therethrough in the first direction. At least one of the top cover and the first current collecting disc partially protrudes toward the other and contacts the other, and the top cover and the first current collecting disc are electrically connected and have a spacing therebetween, the spacing being connected to both the at least one through-hole and the second through-hole. In this arrangement, the winding core, the first current collecting disc, and the top cover are arranged along the first direction, which becomes the axial direction of the battery. By designing the first current collecting disc and / or the top cover as a special-shaped structure, the two are in contact to maintain electrical connection, i.e., the top cover is electrically charged, thereby improving the corrosion resistance of the battery. Furthermore, by providing a spacing between the top cover and the first current collecting disc, and by connecting the at least one through-hole to the second through-hole, the spacing provides space for the electrolyte to distribute and diffuse after it is injected through the second through-hole in the top cover. There are multiple feasible options for the setting position of at least one through hole. Even if at least one through hole is set at a position on the first collecting disk that is not opposite to the second through hole, it can ensure that the electrolyte fully passes through the at least one through hole of the first collecting disk and then enters the winding core axially for infiltration, which solves the problem of how to improve the corrosion resistance of the battery and ensure that the winding core is infiltrated by the electrolyte in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0012] FIG1 is a schematic diagram of the overall structure of a battery provided in one embodiment of the present application;

[0013] FIG2 is a schematic diagram of a cross-sectional structure of a battery provided in one embodiment of the present application;

[0014] FIG3 is a schematic diagram of an exploded structure of a battery provided in one embodiment of the present application;

[0015] FIG4 is a schematic diagram of the cross-sectional structure of a sealing ring provided in one embodiment of the present application;

[0016] FIG5 is a schematic structural diagram of a first current collecting plate provided in one embodiment of the present application;

[0017] FIG6 is a schematic cross-sectional view of a top cover according to an embodiment of the present application;

[0018] FIG7 is a schematic cross-sectional view of a battery according to another embodiment of the present application;

[0019] FIG8 is a schematic structural diagram of a first current collecting plate provided in another embodiment of the present application;

[0020] FIG9 is a schematic cross-sectional view of a first current collecting plate provided in another embodiment of the present application;

[0021] FIG10 is a schematic structural diagram of a top cover provided in an embodiment of the present application;

[0022] FIG11 is a schematic cross-sectional view of a top cover provided in another embodiment of the present application;

[0023] FIG12 is a schematic cross-sectional view of a first current collecting plate provided in another embodiment of the present application.

[0024] In Figures 1 to 12: 1. Winding core; 2. First current collecting plate; 3. Top cover; 4. Shell; 5. Sealing ring; 6. Spacing space; 7. First gap; 8. Sealing glue nail; 9. Sealing metal nail; 10. Second current collecting plate; 11. Positive pole; 12. Insulating medium; 101. Liquid injection channel; 201. Boss; 202. First through hole; 203. Third through hole; 204. Flange; 301. Second through hole; 302. First plane area; 303. Weak area; 304. Sinking area; 305. Second plane area; 401. Limiting connection area; 2011. Top; 2012. Side; 2013. Opening; 501. Groove; 502. Ring groove; 503. Extension. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] As described in the background technology, various companies have widely deployed the production of large cylindrical batteries. The liquid injection process is an important process in the production of cylindrical batteries. In related technologies, due to the structure of cylindrical batteries, the liquid injection process requires a long working time, which in turn leads to high manufacturing costs of the liquid injection process and low overall efficiency of battery production.

[0027] In order to solve the problem of long working hours in the liquid injection process of cylindrical batteries, as shown in Figures 1-3, an embodiment of the first aspect of the present application provides a battery, specifically a cylindrical battery, including a winding core 1, a first current collecting disk 2, a top cover 3, a shell 4, a sealing ring 5, a second current collecting disk 10, a positive electrode column 11 and an insulating medium 12.

[0028] The end of the winding core 1 has a first pole ear and a second pole ear with opposite polarities. Specifically, the pole ear is an integrated structure at the edge of the pole piece, and the positive and negative pole pieces and the diaphragm are stacked and wound to form the winding core 1; the first collecting disc 2 is arranged at the end of the winding core 1 along the first direction and is electrically connected to the winding core 1, that is, the first collecting disc 2 covers the first pole ear and the two are welded, and the first collecting disc 2 is provided with at least one through hole (for example, the first through hole 202) passing through in the first direction; the shell 4 accommodates the winding core 1, the top cover 3 and the first collecting disc 2, and the shell 4 is circumferentially connected to the winding core 1. There is a first gap 7 between them, and the shell 4 is provided with an opening; the top cover 3 is located on one side of the first collecting disc 2 along the first direction and is arranged in the opening, and there is a spacing space 6 between the top cover 3 and the first collecting disc 2, and a second through hole 301 connected to the spacing space 6 is provided, and the second through hole 301 passes through the top cover 3 in the first direction; the sealing ring 5 is sealed between the top cover 3 and the shell 4, so as to prevent the electrolyte from leaking out through the surrounding of the top cover 3, and a liquid channel connecting the spacing space 6 and the first gap 7 is provided between the sealing ring 5 and the first collecting disc 2.

[0029] In the present application, the first direction is the same as the axial direction of the battery.

[0030] With such arrangement, the electrolyte is injected into the core 1 through the second through hole 301 at the top cover 3 and reaches the spacing space 6. The spacing space 6 provides space for the electrolyte to be distributed and diffused. A portion of the electrolyte enters the core 1 along the axial direction of the core 1 through the first through hole 202 of the first collecting disk 2, and penetrates circle by circle along the axial direction. At the same time, some of the electrolyte diffuses to the edge of the first collecting disk 2 through the liquid channel, and then enters the first gap 7, so that the space between the outer periphery of the core 1 and the shell 4 is also filled with electrolyte. The electrolyte penetrates circle by circle from the outermost circle of the core 1 to the inside. In this way, multi-dimensional penetration in the axial and radial directions and counter-penetration between the inner and outer circles are achieved. By improving the battery structure, the electrolyte can penetrate in multiple directions and multiple channels, thereby improving the infiltration speed of the electrolyte, shortening the injection time, and improving the efficiency of the injection process, thereby solving the problem of long working hours in the injection process of cylindrical batteries in related technologies.

[0031] It should be noted that the first tab is the negative tab, the first current collecting disc 2 is the negative current collecting disc, the second tab is the positive tab, the second current collecting disc 10 is the positive current collecting disc, the second current collecting disc 10 covers the second tab and the two are welded together, the positive electrode post 11 is welded to the second current collecting disc 10, and the insulating medium 12 surrounds the positive electrode post 11. The housing 4 surrounds the insulating medium 12 to insulate the positive electrode post 11 from the housing 4. The technical solution provided in this application is preferably applied to cylindrical batteries with positive and negative tabs on opposite sides, that is, the two ends of the winding core 1 are respectively the positive tab and the negative tab. Of course, it can also be applied to cylindrical batteries with positive and negative tabs on the same side.

[0032] In an optional embodiment, as shown in Figure 4, the sealing ring 5 has a certain length in the first direction. At its outward end, the sealing ring 5 seals around the top cover 3. At its inward end, the sealing ring 5 has an extension 503 that extends along the first direction toward the first collecting tray 2. The extension 503 abuts the first collecting tray 2. Furthermore, the end of the sealing ring 5 that contacts the first collecting tray 2 is provided with a groove 501 that is recessed relative to the edge. That is, the groove 501 is recessed along the first direction and serves as a liquid channel. The number of grooves 501 can be set to 1-12. When multiple grooves 501 are provided, they are evenly spaced.

[0033] With this arrangement, the sealing ring 5 not only seals the top cover 3 against the housing 4 but also serves to support the spacer 6, stabilizing the relative position of the first collector plate 2 and the top cover 3, making the overall battery structure safer and more reliable. Furthermore, since the sealing ring 5 and the first collector plate 2 are not completely in contact and sealed in the first direction, a liquid channel is formed for the electrolyte to disperse radially. The notched groove 501 is also easy to machine. Alternatively, the end of the sealing ring 5 that contacts the first collector plate 2 can be flattened, with the sidewall of the sealing ring 5 having a through hole serving as a liquid channel.

[0034] In a specific embodiment, in order to facilitate production and processing, the groove 501 is in the shape of a circular arc, an elliptical arc, or a polygon. The polygon can be a triangle, a trapezoid, a rectangle, or the like.

[0035] In a preferred embodiment, the groove 501 is configured to be semicircular, and the diameter of the groove 501 is 1 mm-4 mm, inclusive.

[0036] With such a setting, after simulation and testing, when the diameter of the groove 501 is less than 1 mm, due to its small size, the electrolyte has a certain viscosity. When the viscosity of the electrolyte is high, the flow speed is slow, and it may even be unable to pass through the groove 501; when the diameter of the groove 501 is greater than 4 mm, due to its large size, it is easy to cause the structural strength of the sealing ring 5 to be unable to be guaranteed and easy to deform; in summary, when the diameter of the groove 501 meets the above range, the diffusion speed of the electrolyte is taken into account, and while ensuring a better liquid injection condition, the structural strength of the sealing ring 5 can be guaranteed.

[0037] In another optional embodiment, the sealing ring 5 has an extension portion 503 close to the first collecting disk 2 along the first direction, and a second gap is defined between the extension portion 503 and the first collecting disk 2 , where the second gap is a liquid channel.

[0038] With such an arrangement, the sealing ring 5 has no contact with the first collecting disc 2 in the first direction. In this case, the gap channel is unobstructed at any point in the radial direction, so that the electrolyte injection efficiency of the first gap 7 between the winding core 1 and the shell 4 reaches the optimal working condition.

[0039] In another specific embodiment, the radial dimension of the first gap 7 in a direction perpendicular to the first direction, that is, the gap distance between the circumference of the winding core 1 and the inner wall of the shell 4, is set to 0.2mm-0.8mm, including the endpoint value, and is preferably set to 0.5mm.

[0040] With such a setting, after simulation and testing, when the first gap 7 is less than 0.2 mm, due to the viscosity of the electrolyte, when it diffuses in the direction from the first collecting disc 2 to the second collecting disc 10, it is easy for the far end to not be filled with electrolyte due to the small gap; when the first gap 7 is greater than 0.8 mm, since a space is added on the original basis, it is difficult to maintain a balance between the original size of the shell 4 and the amount of electricity represented by the diameter of the core 1, and a large adaptive change is required, resulting in additional costs; in summary, when the radial dimension of the first gap 7 meets the above range, it can accommodate sufficient electrolyte while not causing major changes to the original battery specification design.

[0041] In a specific embodiment, the axis of the core 1 is provided with an injection channel 101 that passes through in the first direction. The injection channel 101 is formed when the core 1 is wound into shape. The first through hole 202, the second through hole 301 and the injection channel 101 are coaxially arranged, that is, the central axes of the three in the first direction coincide with each other.

[0042] With this arrangement, the electrolyte enters the interior of the battery through the second through hole 301. The second through hole 301, the spacing space 6, the first through hole 202 and the injection channel 101 together form the main electrolyte flow path. After the electrolyte reaches the spacing space 6, it directly and quickly enters the injection channel 101 and fills the injection channel 101 axially. The electrolyte penetrates from the innermost circle of the winding core 1 to the outside circle by circle, so that the electrolyte is quickly filled in the interior of the battery as much as possible, providing a good prerequisite for the entire electrolyte injection process.

[0043] In a preferred embodiment, at least one through hole further includes a plurality of third through holes 203, that is, the first current collecting disk 2 is further provided with a plurality of third through holes 203 arranged at intervals around the center of the first current collecting disk 2, and the third through holes 203 are opposite to the local first pole ears, that is, the third through holes 203 are connected to the diaphragm between the pole pieces of the winding core 1.

[0044] With such an arrangement, the electrolyte can also penetrate into the spaces between the first electrode tabs along the axial direction through the third through hole 203 and then reach the spaces between the electrode sheets, thereby further optimizing and improving the injection efficiency.

[0045] In an optional embodiment, as shown in Figures 5, 7 and 10, the specific formation method of the spacing space 6 between the top cover 3 and the first collecting disc 2 can be set as follows: the top cover 3 is provided with a second protrusion structure at the sinking area 304 protruding along the first direction toward the first collecting disc 2, and the second protrusion structure abuts the first collecting disc 2; or, it can be set as follows: the first collecting disc 2 is provided with a boss 201 (also called the first protrusion structure) protruding along the first direction toward the top cover 3, and the boss 201 abuts the top cover 3; or, it can be set as follows: the top cover 3 is provided with a second protrusion structure at the sinking area 304 protruding along the first direction toward the first collecting disc 2, the first collecting disc 2 is provided with a boss 201 protruding along the first direction toward the top cover 3, and the boss 201 abuts the second protrusion structure. It should be noted that the second protrusion structure can be formed by stamping the top cover 3 in one piece, and the boss 201 can be formed by stamping the first collector plate 2 in one piece. Abutment means that there is an extrusion interference between the two connected parts, ensuring surface contact and good electrical conductivity. In addition to abutment, additional welding can be used to strengthen the fixation. It should be noted that Figure 10 shows the side of the top cover 3 facing the first collector plate 2.

[0046] With this arrangement, the top cover 3 is electrically connected to the first current collecting disc 2, and the top cover 3 is negatively charged. This forces the top cover 3 to gain electrons, thereby hindering the corrosion process of the top cover 3 losing electrons and improving the corrosion resistance of the top cover 3. Furthermore, the top cover 3 and / or the first current collecting disc 2 support the space 6 through their own special-shaped design, which is not only simple to manufacture and process, but also reliable and highly feasible. Of course, it is also feasible to use metal columns welded between the top cover 3 and the first current collecting disc 2 to support the space 6.

[0047] Furthermore, in an embodiment in which the first current collecting tray 2 is provided with a boss 201 protruding toward the top cover 3 along the first direction, a plurality of bosses 201 are arranged at intervals around the center of the first current collecting tray 2 .

[0048] Such an arrangement provides a uniform and stable abutment relationship, and when the boss 201 covers the third through hole 203 and corresponds one to one, the boss 201 and the third through hole 203 can be obtained simultaneously through a single stamping process, that is, the boss 201 is obtained from the solid material at the third through hole 203, so that the overall processing cost of the first collecting plate 2 is low and the efficiency is high.

[0049] In another preferred embodiment, the sealing ring 5 is provided with an annular groove 502 in the radial direction, and the top cover 3 is embedded in the annular groove 502 , that is, two opposite surfaces of the outer edge of the top cover 3 are in close contact with the sealing ring 5 .

[0050] With this arrangement, the sealing effect is good, the top cover 3 is fixedly installed in the sealing ring 5, and the positional relationship between the two is stable. Moreover, under this connection relationship, there is an assembly relationship between the sealing ring 5 and the top cover 3. During the battery production process, the top cover 3 and the sealing ring 5 are assembled in advance, and the incoming materials have been processed and assembled into one, thereby improving the ease and efficiency of assembly.

[0051] In a specific embodiment, as shown in Figure 5, regarding the connection relationship between the first collecting disc 2 and the shell 4, the outer edge of the first collecting disc 2 can be provided with a flange 204 folded relative to the first collecting disc 2, and the flange 204 is integrally formed with the first collecting disc 2. The flange 204 is located on the side of the first collecting disc 2 facing the top cover 3, and the shell 4 has a limiting connection area 401 with an inner wall folded inward. The limiting connection area 401 is fixed and electrically connected to the flange 204, which is specifically achieved by welding.

[0052] Such a configuration makes the shell 4 negatively charged; moreover, the first current collecting disc 2 is provided with a flange 204, and the flange 204 has a certain inclination angle relative to the first current collecting disc 2. The inner wall of the shell 4 is folded inward to form a limiting connection area 401 protruding radially inward. This area is pressed on the flange 204 to achieve sufficient surface contact, and then welded and fixed. The electrical conduction is stable and reliable, and the position of the first current collecting disc 2 relative to the shell 4 is also more stable.

[0053] In another specific embodiment, the second through hole 301 is sealed with a sealing glue nail 8 , and the sealing glue nail 8 is sealed with a sealing metal nail 9 welded to the top cover 3 .

[0054] With this arrangement, after the injection is completed, since the current workstation cannot complete the final welding and sealing fixation, the second through hole 301 is first blocked by the sealing glue nail 8 to ensure that the electrolyte will not leak out during the movement of the battery on the assembly line equipment. After reaching the sealing welding workstation, the sealing metal nail 9 is covered on the sealing glue nail 8, and then welded and fixed to the top cover 3 to complete the final sealing process.

[0055] In addition, as described in the background technology, various companies have already widely deployed the production of large cylindrical batteries. The structure of the cylindrical batteries is different from each other, and there are different options for whether the top cover is charged.

[0056] Because charging the top cover helps improve the battery's corrosion resistance, this process is often chosen for some cylindrical battery designs and production. However, considering the injection process, the electrolyte is typically injected through the top cover, and the top cover design must ensure that the core is wetted with electrolyte. Therefore, how to achieve top cover charging through battery structural design and ensure that the core is wetted with electrolyte has become a key technical issue for those skilled in the art.

[0057] To this end, the second embodiment of the present application provides another battery to address the related art issues of how to improve the corrosion resistance of the battery and ensure that the winding core is soaked with electrolyte. The battery will be described in detail below with reference to Figures 1, 3, and 7-11.

[0058] As shown in Figures 1, 3, and 7-11, the battery is specifically a cylindrical battery, including a winding core 1, a first current collecting disk 2, a top cover 3, a shell 4, a sealing ring 5, a second current collecting disk 10, a positive electrode column 11, and an insulating medium 12 (also called lower plastic).

[0059] The end of the core 1 has a first electrode ear and a second electrode ear with opposite polarities. Specifically, the electrode ear is an integral structure at the edge of the electrode sheet, and the positive and negative electrode sheets are stacked and wound with the diaphragm to form the core 1; the first current collecting disk 2 is arranged at the end of the core 1 along the first direction and is electrically connected to the core 1, that is, the first current collecting disk 2 covers the first electrode ear and the two are welded therebetween, and the first current collecting disk 2 is provided with at least one through hole (for example, the first through hole 202) passing through along the first direction; the shell 4 accommodates the core 1 and the first current collecting disk 2 and is provided with an opening; the top cover 3 is located on one side of the first current collecting disk 2 along the first direction and is sealed in the opening, and is provided with a second through hole 301 passing through along the first direction; wherein, at least one of the top cover 3 and the first current collecting disk 2 partially protrudes toward the other and contacts each other, the top cover 3 and the first current collecting disk 2 are electrically connected and have a separation space 6, and the separation space 6 is connected to both the first through hole 202 and the second through hole 301.

[0060] In this arrangement, the winding core 1, the first current collecting disc 2 and the top cover 3 are arranged along a first direction, and the first direction becomes the axial direction of the battery. By designing the first current collecting disc 2 and / or the top cover 3 into a special-shaped structure, the two are in contact to maintain electrical connection, that is, the top cover is charged, thereby improving the corrosion resistance of the battery, and there is also a spacing space 6 between the first current collecting disc 2 and the top cover 3, and the spacing space 6 connects the first through hole 202 and the second through hole 301. After the electrolyte is injected from the second through hole 301 at the top cover 3, the spacing space 6 provides a space for the electrolyte to distribute and diffuse. There are multiple feasible options for the setting position of the first through hole 202. Even if the first through hole 202 is set at a position on the first collecting disc 2 that is not opposite to the second through hole 301, it can ensure that the electrolyte fully passes through the first through hole 202 of the first collecting disc 2 and then enters the core 1 axially for infiltration, which solves the problem in the related art of how to realize the charging of the top cover 3 through battery structure design (that is, how to improve the corrosion resistance of the battery) and ensure that the core 1 is infiltrated by the electrolyte.

[0061] It should be noted that, in addition to the contact relationship between the first collecting plate 2 and the top cover 3 , welding may also be performed to strengthen the connection relationship.

[0062] In addition, the first electrode tab is a negative electrode tab, the first current collecting disc 2 is a negative electrode current collecting disc, the second electrode tab is a positive electrode tab, and the second current collecting disc 10 is a positive electrode current collecting disc. The second current collecting disc 10 covers the second electrode tab and is welded therebetween. The positive electrode post 11 is welded to the second current collecting disc 10, and an insulating medium 12 surrounds the positive electrode post 11. The housing 4 surrounds the insulating medium 12 to insulate the positive electrode post 11 from the housing 4. A sealing ring 5 is sealed between the top cover 3 and the housing 4, and the end of the sealing ring 5 can abut against the first current collecting disc 2, or there can be a gap between the two.

[0063] In an optional embodiment, as shown in Figures 8 and 9, the first current collecting disc 2 is configured as a special-shaped structure that protrudes toward the top cover 3. Specifically, the first current collecting disc 2 is provided with a plurality of annular bosses 201. The bosses 201 protrude toward the top cover 3 relative to the first current collecting disc 2 and abut against the top cover 3. Preferably, all bosses 201 are arranged around the center of the first current collecting disc 2. The bosses 201 are made of the same material as the first current collecting disc 2. Specifically, the bosses 201 can be integrally formed with the first current collecting disc 2 by stamping, welded to the first current collecting disc 2, or integrally cast with the first current collecting disc 2 to meet electrical conductivity requirements.

[0064] With such arrangement, since the bosses 201 are distributed at intervals, the interval space 6 between the first collecting disk 2 and the top cover 3 is not divided and is connected everywhere, which is conducive to the electrolyte entering and diffusing to the edge of the first collecting disk 2, and then entering the space between the outer periphery of the winding core 1 and the shell 4, infiltrating the outer side of the winding core 1, and improving the efficiency of the liquid injection process.

[0065] It should be noted that, in addition to the abutment, the top cover 3 and the first collecting plate 2 may be additionally strengthened and fixed by welding.

[0066] In a specific embodiment, the axis of the core 1 is provided with an injection channel 101 that passes through in the first direction. The injection channel 101 is formed when the core 1 is wound into shape. The first through hole 202, the second through hole 301 and the injection channel 101 are coaxially arranged, that is, the central axes of the three in the first direction coincide with each other.

[0067] The reasons and beneficial effects of setting the first through hole 202, the second through hole 301 and the injection channel 101 in this way are the same as those of the embodiment of the first aspect, and will not be repeated here. For details, please refer to the relevant description of the embodiment of the first aspect.

[0068] In a preferred embodiment, the at least one through hole further includes a plurality of third through holes 203 , that is, the first collecting plate 2 is further provided with a plurality of third through holes 203 spaced around the center of the first collecting plate 2 , and the third through holes 203 are connected to the spacing space 6 .

[0069] With this arrangement, the electrolyte can also penetrate axially through the third through-hole 203, first into the space between the first tabs, and then into the space between the pole pieces, further optimizing and improving the injection efficiency. Preferably, each boss 201 covers the third through-hole 203, with the boss 201 corresponding to the third through-hole 203 one-to-one. The boss 201 can be transformed from a solid structure hollowed out at the location where the third through-hole 203 is set on the first current collecting disc 2, that is, the third through-hole 203 is formed at the same time as the boss 201 is formed. This is easy to process and low in cost, and leaves space for the welding area between the first current collecting disc 2 and the tab on the winding core 1. The boss 201 can also be independently welded to the third through-hole 203, thereby enhancing the structural strength of the first current collecting disc 2. Of course, it can also be arranged so that there is no corresponding relationship between the third through-hole 203 and the boss 201.

[0070] Furthermore, the boss 201 includes an integrally connected top portion 2011 and side portion 2012. The top portion 2011 is located above the third through hole 203 and abuts the top cover 3. The side portion 2012 is connected between the top portion 2011 and the first collecting plate 2. At least one side of the boss 201 is an opening 2013 connecting the third through hole 203 and the partition 6. For example, at least one side of the boss 201 may include the side portion 2012. The side portion specifically refers to the surface of the boss 201 facing the partition 6. That is, some of the side portions are the side portions 2012, and the remaining side portions are the openings 2013. Preferably, two opposing side portions 2012 are provided, that is, the side portions 2012, the top portion 2011, and the side portions 2012 are integrally connected in a "J" shape. Correspondingly, the other two side portions of the boss 201 are openings 2013.

[0071] With such arrangement, the top 2011 can ensure that the first collecting plate 2 has sufficient surface contact with the top cover 3, and the side 2012 supports the top 2011 and keeps it away from the third through hole 203, thereby ensuring the connection between the third through hole 203 and the partition space 6; moreover, the boss 201 covers the third through hole 203, which can also compensate for the weakening of the structural strength caused by the setting of the third through hole 203 on the first collecting plate 2.

[0072] Regarding the shape of the boss 201 , the projection of the boss 201 onto the first collecting plate 2 may be in the shape of a sector ring, a circle, an ellipse, or a polygon, preferably a sector ring.

[0073] In a specific embodiment, in the first direction, the height H1 of the boss 201 and the thickness W1 of the first collecting plate 2 satisfy H1<20*W1; or, in the first direction, the height H1 of the boss 201 satisfies 0.3mm≤H1≤2mm; or, both of the above conditions are satisfied.

[0074] With this arrangement, on the one hand, since the boss 201 is an integral structure obtained by shearing and stamping a part of the first collecting disc 2, the thickness of the boss 201 will be thinner. After testing and simulation, when H1 ≥ 20*W1, the boss 201 will not be able to maintain sufficient structural strength, and will not be able to generate sufficient resistance to maintain normal contact with the top cover 3 when assembled; when H1 < 20*W1, it is ensured that the boss 201 has sufficient structural strength to maintain contact with the top cover 3, and the strength of the overall structure of the first collecting disc 2 is better; on the other hand, On the one hand, when H1 is less than 0.3 mm, the protrusion of the boss 201 is too small, and the opening 2013 formed is small, which is not conducive to the electrolyte passing through it to reach the first through hole 202. When H1 is greater than 2 mm, the boss 201 may not be able to maintain sufficient structural strength, and may not be able to generate sufficient resistance to maintain normal contact with the top cover 3 when assembled. When 0.3 mm ≤ H1 ≤ 2 mm is satisfied, the boss 201 is ensured to have sufficient structural strength to maintain contact with the top cover 3, and the overall structural strength of the first collecting plate 2 is better.

[0075] In an optional embodiment, as shown in Figures 10-11, the top cover 3 is provided as a special-shaped structure protruding toward the first collecting disk 2. Specifically, the top cover 3 includes a first plane area 302, a sinking area 304 and a second plane area 305 distributed in sequence from the inside to the outside along the radial direction, that is, the first plane area 302 surrounds the second through hole 301; the sinking area 304 surrounds the first plane area 302; the second plane area 305 surrounds the sinking area 304; wherein, the top cover 3 at the sinking area 304 (equivalent to the second protruding structure) protrudes toward the first collecting disk 2 relative to the top cover 3 at the first plane area 302 and the top cover 3 at the second plane area 305, and the top cover 3 at the sinking area 304 abuts against the first collecting disk 2. The top covers 3 in each area are coaxially distributed with the center of the second through hole 301 as the axis. The top cover 3 in the first plane area 302 and the top cover 3 in the second plane area 305 are on the same plane and have the same thickness, representing the main body of the top cover 3; one side of the top cover 3 in the sinking area 304 is sunken relative to the main body of the top cover 3, and the other side protrudes relative to the main body of the top cover 3; the special-shaped design of the top cover 3 can be formed as a whole by flat sheet stamping, or by casting.

[0076] With this arrangement, the overall structure of the top cover 3 is integrated, and the top cover 3 at the recessed area 304 is uniform and continuous. As the structure exposed to the outside, the top cover 3 has good structural strength, ensuring battery safety. Of course, it is also feasible to omit the second protrusion structure at the recessed area 304 and provide a metal protrusion of the same material on the surface of the top cover 3 facing the first current collecting tray 2.

[0077] Furthermore, the top cover 3 also includes a weak area 303 located between the first plane area 302 and the sinking area 304. The top cover 3 in each area is annular. Along the first direction, the thickness of the top cover 3 in the weak area 303 is smaller than the thickness of the top cover 3 in the first plane area 302, the top cover 3 in the sinking area 304 and the top cover 3 in the second plane area 305. Along the direction perpendicular to the first direction, the top cover 3 in the weak area 303 is annular and has an inner diameter of D1, and the outer diameter of the top cover 3 in the second plane area 305 is D; D1 and D satisfy: 0.5≤D1 / D≤1.

[0078] With this arrangement, the weak area 303 plays an explosion-proof role in the battery. When the internal pressure of the battery reaches a certain level, the top cover 3 at the weak area 303 is the first to rupture, causing leakage and ensuring safe use. Moreover, through tests and simulations, when D1 / D is less than 0.5, the position of the weak area 303 is reflected to be close to the center. In this case, the overall coverage area of ​​the top cover 3 at the weak area 303 is small, the blasting pressure will be higher than the specification requirements, and the safety risk is high. When the radial position of the weak area 303 meets the above conditions, the blasting pressure of the top cover 3 at the weak area 303 is guaranteed to be within a safe range.

[0079] In a specific embodiment, the sunken area 304 is sunken relative to the first planar area 302 from the side of the top cover 3 away from the first collecting tray 2, and the depth of the sunken area along the first direction is H2; where H2 satisfies 0.2 mm ≤ H2 ≤ 2 mm; or, along the first direction, the thickness of the top cover 3 at the first planar area 302 is W2, and H2 and W2 satisfy: H2 < 4 * W2; or, both of the above conditions are met. The thickness of the top cover 3 at the first planar area 302 is also the thickness of the main body of the top cover 3.

[0080] With such a setting, through experiments and simulations, on the one hand, under the premise that the height of the spacing space 6 is certain, when H2 is less than 0.2mm, due to the small sinking degree, the first collecting disc 2 will be required to have a higher degree of protrusion, which will cause the overall strength of the first collecting disc 2 to be weakened and fail to meet the design requirements; when H2 is greater than 2mm, the sinking degree is redundant, which will correspondingly occupy the protrusion height of the first collecting disc 2, resulting in the problem of a small opening of the opening 2013 of the boss 201; when H2 satisfies 0.2mm≤H2≤2mm, it is within the sinking degree range that meets the design requirements. On the other hand, since the top cover 3 at the sinking area 304 is an integrated structure obtained by stamping a part of the top cover 3, the thickness of the top cover 3 at the sinking area 304 will be thinner. After experiments and simulations, when H2≥4*W2, the top cover 3 at the sinking area 304 will not be able to maintain sufficient structural strength, and the ability of the top cover 3 to withstand pressure will not meet the requirements, affecting the design blasting pressure of the top cover 3 at the weak area 303; when H2<4*W2 is satisfied, it is ensured that the top cover 3 at the sinking area 304 has sufficient structural strength, and the strength of the overall structure of the top cover 3 is better, meeting the pressure-bearing requirements.

[0081] According to the above embodiment, it is preferred that the top cover 3 is provided with a sinking area 304 and the first collecting plate 2 is provided with a boss 201 in combination. The boss 201 abuts against the top cover 3 at the sinking area 304, that is, the spacing space 6 is jointly supported by the top cover 3 and the first collecting plate 2.

[0082] In another optional embodiment, the second through hole 301 is a straight hole; or, the second through hole 301 is a stepped hole having a countersink area, and the sinking depth of the countersink area relative to the first planar area 302 along the first direction is less than or equal to 0.5 mm.

[0083] With such a setting, the second through hole 301 can be set as a cylindrical straight hole with the same inner diameter at all places, so that the top cover 3 is easier to process and has low cost; the second through hole 301 can also be set as a stepped hole, so that after the injection is completed, the sealing structure for blocking the second through hole 301 is hidden under the top cover 3 or flush with the top cover 3; moreover, after experiments and simulations, when the sinking depth of the countersunk area relative to the first plane area 302 is less than or equal to 0.5mm, it can ensure that the accommodation conditions are provided. When the sinking depth of the countersunk area relative to the first plane area 302 is greater than 0.5mm, the sinking degree is redundant and is not suitable for the common sealing nail structure. It is easy to have a pit in the center of the outer side of the top cover 3, which does not meet the design requirements.

[0084] In addition, regarding the connection relationship between the first collecting disc 2 and the shell 4, the outer edge of the first collecting disc 2 can be provided with a flange 204 that is folded relative to the first collecting disc 2. The flange 204 is integrally formed with the first collecting disc 2. The flange 204 is located on the side of the first collecting disc 2 facing the top cover 3. The shell 4 has a limiting connection area 401 with an inner wall folded inward. The limiting connection area 401 is fixed and electrically connected to the flange 204, which is specifically achieved by welding.

[0085] The reasons and beneficial effects of setting the connection relationship between the first collecting plate 2 and the shell 4 in this way are the same as those in the embodiment of the first aspect, and will not be repeated here. For details, please refer to the relevant description of the embodiment of the first aspect.

[0086] In addition, the second through hole 301 is sealed with a sealing glue nail 8 , and the sealing glue nail 8 is sealed with a sealing metal nail 9 welded to the top cover 3 .

[0087] In addition, as described in the embodiment of the first aspect, the liquid injection process is an important process in the production of cylindrical batteries. During the liquid injection process, the difficulty of liquid seepage directly affects the efficiency of liquid injection and the manufacturing cost.

[0088] In the related art, liquid injection is generally performed at the negative end. On the one hand, the negative electrode tab of the winding core is welded to the negative electrode current collector. On the other hand, the electrolyte needs to pass through the hole opened in the center of the negative electrode current collector to reach the injection channel in the center of the winding core before it can gradually infiltrate. In this way, the area of ​​the liquid seepage port of the negative electrode current collector and the area of ​​the welding area are in a mutually restrictive negative correlation. If the area of ​​the welding area is too small, the current collector will not have a current flow capacity that matches the capacity of the winding core. If the area of ​​the liquid seepage port is too small, the electrolyte seepage speed and the overall liquid injection efficiency will be reduced. Therefore, how to balance the electrolyte seepage capacity and current flow capacity of the current collector is a relatively important issue in the manufacturing process of cylindrical batteries.

[0089] To this end, the third embodiment of the present application provides another battery to solve the problem of how to balance the electrolyte permeability and current flow capacity of the current collecting plate in the related art. The battery will be described in detail below with reference to Figures 1, 3, 6-8 and 12.

[0090] As shown in Figures 1, 3 and 7, the battery is specifically a cylindrical battery, including a winding core 1, a first current collecting disk 2, a top cover 3, a shell 4, a sealing ring 5, a second current collecting disk 10, a positive electrode column 11, and an insulating medium 12 (also called lower plastic).

[0091] The end of the core 1 has a first electrode ear and a second electrode ear with opposite polarities. Specifically, the electrode ear is an integral structure at the edge of the electrode sheet, and the positive and negative electrode sheets are stacked and wound with the diaphragm to form the core 1; the first current collecting disk 2 is opposite to the first electrode ear at the end of the core 1 along the first direction and is electrically connected, that is, the first current collecting disk 2 covers the first electrode ear and the two are welded, and the first current collecting disk 2 is provided with at least one through hole (for example, the third through hole 203) passing through along the first direction; the third through hole 203 deviates from the center of the first current collecting disk 2 and is arranged opposite to the local core 1. There are several third through holes 203 and the sum of the effective passing areas is S1. The total area of ​​the first current collecting disk 2 facing the core 1 is S, the capacitance of the core 1 is C, and S, S1, and C satisfy 1 / 100≤S1 / (S*√C)≤1 / 20. It should be noted that the effective passage area of ​​the third through hole 203 specifically refers to that in the first direction, if the cross-sectional dimensions at any point are the same, then the cross-sectional area is the effective passage area; if the cross-sectional dimensions are different, then the smallest cross-sectional dimension is the effective passage area; the shape of the first collecting disk 2 matches the shape of the winding core 1. The battery of the present application is a cylindrical battery, then the winding core 1 is cylindrical, and the first collecting disk 2 is a circular thin sheet.

[0092] In this way, the end of the winding core 1 is opposite to the first collecting disc 2, and the first collecting disc 2 is provided with a third through hole 203, which allows the electrolyte to enter the space between the pole pieces of the winding core 1 along the axial direction and gradually infiltrate, thereby improving the injection efficiency. At the same time, the first collecting disc 2 is used to maintain an electrical connection with the winding core 1 on the side facing the winding core 1. Although the design of the third through hole 203 occupies a part of the electrical connection area, or welding area, between the first collecting disc 2 and the winding core 1, the mathematical fitting relationship obtained through experiments and simulations shows that for all third through holes 2 The relationship between the total effective passing area S1 of 03, the total area S of the side of the first collecting disc 2 facing the core 1, and the capacitance C of the core 1 is that when S1 / (S*√C) is less than 1 / 100, the electrolyte penetration is too slow and the injection efficiency is low. When S1 / (S*√C) is greater than 1 / 20, the welding area between the core 1 and the first collecting disc 2 is small, and the current flow capacity of the first collecting disc 2 is weak. When 1 / 100≤S1 / (S*√C)≤1 / 20 is satisfied, the electrolyte penetration capacity and current flow capacity of the collecting disc are taken into consideration.

[0093] It should be noted that S1 / (S*√C) is a mathematical relationship based on the fit obtained through experiments and simulations. The units of S and S1 are the same, and the unit of C is Ah. The square root of C has no physical meaning and only reflects the numerical relationship. For ease of understanding, for example, when the capacitance C of the winding core 1 is 32 Ah, the diameter of the first collecting disc 2 is 44 mm, and the total area S is 1520 mm 2 , then the total effective passing area S1 of all third through holes 203 can be 172 mm 2, 172 / (1520*√32)≈0.02, this set of parameters conforms to the range of the above relationship.

[0094] In a specific embodiment, the diameter of the winding core 1 is d, and d, S, and S1 satisfy (1 / 20)*√((π(d / 2) 2 )*S)≤S1≤(1 / 4)*√((π(d / 2) 2 )*S).

[0095] With this setting, through experiments and simulations, when S1<(1 / 20)*√((π(d / 2) 2 )*S), the electrolyte penetration is too slow, the injection efficiency is low, and the cycle performance of the battery is affected; when S1>(1 / 4)*√((π(d / 2) 2 )*S), the welding area between the winding core 1 and the first collecting disc 2 is small, and the current carrying capacity of the first collecting disc 2 is weak; when the above relationship is satisfied, the electrolyte permeability and current carrying capacity of the collecting disc are taken into account.

[0096] In addition, the first electrode tab is a negative electrode tab, the first current collecting disc 2 is a negative electrode current collecting disc, the second electrode tab is a positive electrode tab, the second current collecting disc 10 is a positive electrode current collecting disc, the second current collecting disc 10 covers the second electrode tab and the two are welded, the positive electrode column 11 is welded to the second current collecting disc 10, and the insulating medium 12 surrounds the positive electrode column 11, and the shell 4 surrounds the insulating medium 12 to insulate the positive electrode column 11 from the shell 4.

[0097] In a preferred embodiment, the top cover 3 is opposite to and electrically connected to the first current collecting disk 2 along a first direction, and has a spacing space 6 between the top cover 3 and the first current collecting disk 2. The top cover 3 is provided with a second through hole 301 connected to the third through hole 203 through the spacing space 6. The second through hole 301 passes through in the first direction so that the electrolyte can be injected into the battery from the second through hole 301; the shell 4 accommodates the winding core 1, the top cover 3 and the first current collecting disk 2, and the sealing ring 5 is sealed between the outer edge of the top cover 3 and the inner wall of the shell 4, so as to prevent the electrolyte from leaking through the periphery of the top cover 3.

[0098] With such an arrangement, the electrolyte is injected inward from the second through hole 301 at the top cover 3 and reaches the interval space 6. The interval space 6 provides space for the electrolyte to be distributed and diffused. No matter where the third through hole 203 is set on the first current collecting disk 2, the electrolyte can fully pass through the third through hole 203 of the first current collecting disk 2, and then enter the core 1 along the axial direction of the core 1 for infiltration. In this way, although the first current collecting disk 2 has a special-shaped design, the entire battery structure still has only a unique second through hole 301 connecting the inside and the outside, and the second through hole 301 does not need to be adaptively arranged according to the position of the third through hole 203, which is conducive to the battery provided in this application being adapted to existing battery production equipment.

[0099] In addition, the second through hole 301 is sealed with a sealing glue nail 8 , and the sealing glue nail 8 is sealed with a sealing metal nail 9 welded to the top cover 3 .

[0100] The reasons and beneficial effects of setting the sealing glue nail 8 and the sealing metal nail 9 in this way are the same as those in the embodiment of the first aspect, and will not be repeated here. For details, please refer to the relevant description of the embodiment of the first aspect.

[0101] In an optional embodiment, as shown in Figures 6, 8, and 12, the specific formation method of the spacing space 6 between the top cover 3 and the first collecting disc 2 is the same as that of the embodiment of the first aspect and will not be repeated here. For details, please refer to the relevant description of the embodiment of the first aspect. It should be noted that the second protrusion structure at the sinking area 304 can be formed by the top cover 3 through integral stamping or casting, and the boss 201 can be formed by the first collecting disc 2 through integral stamping or casting. In addition to the abutment, the top cover 3 and the first collecting disc 2 can also be additionally fixed by welding.

[0102] The reasons and beneficial effects of the specific formation of the spacing space 6 are the same as those of the embodiment of the first aspect and will not be repeated here. For details, please refer to the relevant description of the embodiment of the first aspect. Of course, it is also feasible to use metal columns welded between the top cover 3 and the first collecting plate 2 to support the spacing space 6.

[0103] Furthermore, the first protrusion structure 201 described in the embodiment of the first aspect is a boss 201 covering the third through hole 203. As shown in Figure 8, the boss 201 corresponds one-to-one to the third through hole 203. The specific structure of the boss 201 is the same as that of the embodiment of the second aspect and will not be repeated here. Please refer to the relevant description of the embodiment of the second aspect for details.

[0104] The reasons and beneficial effects of setting the boss 201 in this way are the same as those in the embodiment of the second aspect, and will not be repeated here. For details, please refer to the relevant description of the embodiment of the second aspect.

[0105] Of course, the position of the boss 201 may be independent of the position of the third through hole 203. In addition, the second protruding structure at the sunken area 304 on the top cover 3 may be an annular sunken platform, one side of which is sunken relative to the main body of the top cover 3 and the other side is protruding relative to the main body of the top cover 3.

[0106] In a preferred embodiment, regarding the connection relationship between the first collecting disc 2 and the shell 4, the outer edge of the first collecting disc 2 can be provided with a flange 204 that is folded relative to the first collecting disc 2, and the flange 204 is integrally formed with the first collecting disc 2. The flange 204 is located on the side of the first collecting disc 2 facing the top cover 3, and the shell 4 has a limiting connection area 401 with an inner wall folded inward. The limiting connection area 401 is fixed and electrically connected to the flange 204, which is specifically achieved by welding.

[0107] The reasons and beneficial effects of setting the connection relationship between the first collecting plate 2 and the shell 4 in this way are the same as those in the embodiment of the first aspect, and will not be repeated here. For details, please refer to the relevant description of the embodiment of the first aspect.

[0108] Furthermore, along the first direction, the thickness T1 of the first collecting disc 2 and the thickness T2 of the flange 204 are both set to 0.15mm-0.4mm, including the endpoint values. Specifically, the flange 204 and the first collecting disc 2 can be folded into one piece, and the thickness of the two is consistent, as shown in Figure 12; and / or, along the first direction, the flange 204 is tilted relative to the first collecting disc 2 and the tilting height is 0.5mm-4mm, including the endpoint values.

[0109] With such a configuration, on the one hand, when the thickness T1 of the first current collecting disc 2 and the thickness T2 of the flange 204 are both less than 0.15 mm, the first current collecting disc 2 is too thin, and there is a hidden danger that the structural strength does not meet the requirements, and it is easy to deform and affect the safety performance of the battery; and when T1 and T2 are both greater than 0.4 mm, under the premise of the radial width range of the flange 204 required by the process, the excessive thickness can easily make the folding processing difficult, and the folded flange 204 is easy to break; when the above-mentioned thickness range and the above-mentioned warping height range are met, the structural strength of the first current collecting disc 2 meets the requirements, the flange 204 is easy to be obtained by folding processing without breaking, and the overall structure is stable. On the other hand, when the raised height of the flange 204 is less than 0.5 mm, it is too low and has a small inclination, and cannot provide abutment strength and sufficient contact area for the limiting connection area 401 of the shell 1, which easily causes a virtual connection with low connection strength; and when the raised height of the flange 204 is greater than 4 mm, its inner side has a larger downward pressure space, so that the deformation space close to the first collecting plate 2 is large, that is, the molding strength is slightly poor, and secondary deformation is easy to occur when connected with the limiting connection area 401, causing the overall internal structure of the battery to deviate from the preset model; when the above-mentioned raised height range is met, the flange 204 provides sufficient abutment strength and sufficient contact area for the limiting connection area 401 of the shell 1, and the molding strength meets the assembly requirements and is not easy to deform.

[0110] Furthermore, the gap between the outer edge of the first collecting plate 2 and the inner wall of the housing 4, along a direction perpendicular to the first direction, is 0.02mm-0.06mm. This gap ensures that the outermost layer of the winding core 1 does not contact the inner wall of the housing 4, while fully utilizing the attachment area of ​​the first collecting plate 2 for welding the first tab, as the winding core 1 is welded to the first collecting plate 2.

[0111] In an optional embodiment, the axis of the winding core 1 is provided with an injection channel 101 that passes through in the first direction, and the at least one through hole also includes a first through hole 202 located in the center of the first collecting disk 2, that is, the center of the first collecting disk 2 is provided with a first through hole 202 that is arranged opposite to the injection channel 101, and the first through hole 202 connects the partition space 6 with the injection channel 101, and a sealing ring 5 is sealed between the top cover 3 and the shell 4, and the end of the sealing ring 5 abuts on the first collecting disk 2, and further refines S, S1, and C to satisfy: 3 / 200≤S1 / (S*√C)≤1 / 25.

[0112] With such an arrangement, after the electrolyte enters the spacing space 6, it can also enter the injection channel 101 of the core 1 through the first through hole 202 of the first current collecting disk 2, and gradually infiltrate the core 1 from the inner circle through the injection channel 101, thereby improving the injection efficiency of the battery; at the same time, the design of the sealing ring 5 against the first current collecting disk 2 stabilizes the relative position of the first current collecting disk 2 and the top cover 3, and optimizes the overall stability of the internal structure of the battery, so that the sealing ring 5 seals the surrounding of the spacing space 6. At this time, the battery design structure does not allow the electrolyte to penetrate into the surrounding gap of the core 1 for auxiliary infiltration, further reducing the ratio range of the relationship between the sum of the effective passing areas S1 of all third through holes 203, the total area S of the side of the first current collecting disk 2 facing the core 1, and the capacitance C of the core 1, so as to ensure that under this embodiment, the electrolyte penetration capacity and current flow capacity of the collecting disk can still be effectively taken into account.

[0113] In another specific embodiment, the sum of the effective passing areas S1 of all the third through holes 203 and the total area S of the first collecting disk 2 facing the winding core 1 satisfy 1 / 125<S1 / S<1 / 50.

[0114] With this arrangement, there is an additional relationship between the third through hole 203 and the first current collecting disc 2, which limits the proportion of the total area occupied by the third through hole 203. Through experiments and simulations, when S1 / S is less than 1 / 125, the total opening of the third through hole 203 is too small, the electrolyte passage area is small, and it is difficult to achieve a better electrolyte permeability; and when S1 / S is greater than 1 / 50, the area hollowed out of the first current collecting disc 2 is too large, which easily causes the structural strength of the first current collecting disc 2 to fail to meet the design requirements; when the above relationship is met, it is ensured that the first current collecting disc 2 has sufficient structural strength and structural rigidity, and the passage area provided for the electrolyte meets the design requirements.

[0115] In a preferred embodiment, a plurality of third through holes 203 are provided and are evenly arranged around the center of the first collecting plate 2 . The shape of the third through holes 203 is a sector ring, a circle, an ellipse, or a polygon.

[0116] Such arrangement improves the efficiency of the winding core 1 being completely soaked in the electrolyte from the third through hole 203 , and further improves the electrolyte permeability while ensuring that the first current collecting disc 2 has a current flow capacity.

[0117] Finally, based on the above-mentioned battery, the embodiment of the present application further provides an electric device, which includes the above-mentioned battery. Since the electric device includes the above-mentioned battery, the beneficial effects brought by the battery to the electric device can be found in the above content and will not be repeated here.

[0118] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0119] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0120] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0121] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0122] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly illustrate the technical solutions and cannot be used to limit the scope of protection of the present application.

[0123] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A battery, characterized in that: include: Roll core (1); A first current collecting disk (2) is arranged at an end of the winding core (1) along a first direction and is electrically connected to the winding core (1), and is provided with at least one through hole penetrating along the first direction; A housing (4) for accommodating the winding core (1); A top cover (3) is located on one side of the first current collecting plate (2) along the first direction, has a spacing space (6) between the top cover (3) and the first current collecting plate (2), and is provided with a second through hole (301) connected to the spacing space (6), and at least one of the top cover (3) and the first current collecting plate (2) partially protrudes toward the other and contacts each other.

2. The battery according to claim 1, characterized in that A first gap (7) is provided between the shell (4) and the winding core (1) in the circumferential direction; The battery further comprises: a sealing ring (5) which seals between the top cover (3) and the shell (4), and has a liquid channel between the sealing ring and the first current collecting plate (2) which connects the partition space (6) and the first gap (7).

3. The battery according to claim 2, characterized in that The sealing ring (5) has an extension portion (503) close to the first current collecting disk (2) along the first direction, the extension portion (503) abuts against the first current collecting disk (2), and the end of the sealing ring (5) in contact with the first current collecting disk (2) is provided with a groove (501) recessed relative to the edge, and the groove (501) is the liquid channel.

4. The battery according to claim 3, characterized in that The groove (501) is in the shape of a circular arc, an elliptical arc, or a polygon.

5. The battery according to claim 3, characterized in that The groove (501) is semicircular, and the diameter of the groove (501) is 1 mm-4 mm.

6. The battery according to claim 2, characterized in that The sealing ring (5) has an extension portion (503) close to the first collecting plate (2) along the first direction, and a second gap is provided between the extension portion (503) and the first collecting plate (2), and the second gap is the liquid channel.

7. The battery according to any one of claims 2 to 6, characterized in that The sealing ring (5) is provided with an annular groove (502) in the radial direction, and the top cover (3) is embedded in the annular groove (502).

8. The battery according to any one of claims 2 to 7, characterized in that Along a direction perpendicular to the first direction, a radial dimension of the first gap (7) is 0.2 mm-0.8 mm.

9. The battery according to any one of claims 1 to 8, characterized in that The at least one through hole comprises a first through hole (202) located at the center of the first collecting plate (2); the axis of the winding core (1) is provided with a liquid injection channel (101) extending in the first direction; the first through hole (202), the second through hole (301) and the liquid injection channel (101) are coaxially arranged.

10. The battery according to any one of claims 1 to 9, characterized in that The outer edge of the first current collecting disc (2) is provided with a flange (204) folded relative to the first current collecting disc (2), the flange (204) being located on a side of the first current collecting disc (2) facing the top cover (3), the shell (4) having a limiting connection area (401) with an inner wall folded inwards, the limiting connection area (401) being fixed and electrically connected to the flange (204).

11. The battery according to claim 10, characterized in that Along the first direction, the thickness of the first current collecting plate (2) and the thickness of the flange (204) are both 0.15 mm to 0.4 mm; And / or, along the first direction, the flange (204) is tilted relative to the first collecting plate (2) and the tilting height is 0.5 mm-4 mm.

12. The battery according to any one of claims 1 to 11, characterized in that The second through hole (301) is sealed with a sealing glue nail (8), and the sealing glue nail (8) is sealed with a sealing metal nail (9) fixedly connected to the top cover (3).

13. The battery according to claim 1, characterized in that The top cover (3) comprises: A first plane area (302) surrounding the second through hole (301); A sinking area (304) surrounding the first plane area (302); A second plane area (305) surrounding the sinking area (304); The top cover (3) at the sinking area (304) protrudes toward the first collecting plate (2) relative to the top cover (3) at the first plane area (302) and the top cover (3) at the second plane area (305), and the top cover (3) at the sinking area (304) abuts against the first collecting plate (2).

14. The battery according to claim 13, characterized in that The top cover (3) further comprises a weak area (303) located between the first plane area (302) and the sink area (304); along the first direction, the thickness of the top cover (3) at the weak area (303) is respectively smaller than the thickness of the top cover (3) at the first plane area (302), the thickness of the top cover (3) at the sink area (304), and the thickness of the top cover (3) at the second plane area (305); along the direction perpendicular to the first direction, the top cover (3) at the weak area (303) is annular and has an inner diameter of D1, and the outer diameter of the top cover (3) at the second plane area (305) is D; D1 and D satisfy: 0.5≤D1 / D≤1.

15. The battery according to claim 13 or 14, characterized in that: From a side of the top cover (3) away from the first current collecting plate (2), the sinking area (304) sinks relative to the first plane area (302) and the sinking depth along the first direction is H2; wherein, H2 satisfies 0.2mm≤H2≤2mm; Along the first direction, the thickness of the top cover (3) at the first plane area (302) is W2, and H2 and W2 satisfy: H2<4*W2.

16. The battery according to any one of claims 13 to 15, characterized in that The second through hole (301) is a straight hole; or, The second through hole (301) is a stepped hole having a countersunk area, and the sinking depth of the countersunk area along the first direction relative to the first plane area (302) is less than or equal to 0.5 mm.

17. The battery according to any one of claims 1, 13 to 16, characterized in that: The first current collecting disc (2) is provided with a plurality of bosses (201), and the plurality of bosses (201) protrude toward the top cover (3) relative to the first current collecting disc (2) and abut against the top cover (3).

18. The battery according to claim 17, characterized in that The plurality of bosses (201) are arranged at intervals around the center of the first current collecting plate (2).

19. The battery according to claim 17 or 18, characterized in that: The at least one through hole comprises a plurality of third through holes (203) arranged at intervals around the center of the first collecting plate (2); The boss (201) comprises: A top portion (2011), located above the corresponding third through hole (203) and abutting against the top cover (3); A side portion (2012) connected between the top portion (2011) and the first current collecting plate (2); Wherein, at least one side surface of the boss (201) has an opening (2013) connecting the corresponding third through hole (203) and the spacing space (6).

20. The battery according to any one of claims 17 to 19, characterized in that Along the first direction, the height H1 of the boss (201) and the thickness W1 of the first collecting plate (2) satisfy H1<20*W1; and / or, Along the first direction, a height H1 of the boss (201) satisfies 0.3 mm ≤ H1 ≤ 2 mm.

21. The battery according to any one of claims 17 to 20, characterized in that The shape of the projection of the boss (201) onto the first current collecting plate (2) is a fan ring, a circle, an ellipse or a polygon.

22. The battery according to any one of claims 1 to 21, characterized in that The at least one through hole comprises a first through hole 2 (02) located at the center of the first collecting plate (2); the spacing space (6) is connected to both the first through hole 2 (02) and the second through hole (301).

23. The battery according to any one of claims 1 to 22, characterized in that The at least one through hole comprises a plurality of third through holes (203) arranged at intervals around the center of the first collecting plate (2), and the plurality of third through holes (203) are in communication with the interval space (6).

24. The battery according to claim 23, characterized in that The plurality of third through holes (203) are offset from the center of the first current collecting disk (2) and are arranged opposite to a part of the winding core (1); the sum of the effective passing areas of the plurality of third through holes (203) is S1; the total area of ​​a side of the first current collecting disk (2) facing the winding core (1) is S; the capacitance of the winding core (1) is C; S, S1, and C satisfy 1 / 100≤S1 / (S*√C)≤1 / 20.

25. The battery according to claim 24, characterized in that The diameter of the winding core (1) is d, and d, S, and S1 satisfy (1 / 20)*√((π(d / 2) 2 )*S)≤S1≤(1 / 4)*√((π(d / 2) 2 )*S).

26. The battery according to claim 24 or 25, characterized in that The at least one through hole further comprises a first through hole (202) located at the center of the first collecting plate (2); S, S1, and C satisfy: 3 / 200≤S1 / (S*√C)≤1 / 25.

27. The battery according to any one of claims 24 to 26, characterized in that S and S1 satisfy 1 / 125<S1 / S<1 / 50.

28. The battery according to any one of claims 23 to 27, characterized in that The shape of the third through hole (203) is a fan ring, a circle, an ellipse or a polygon.

29. The battery according to any one of claims 1 to 28, characterized in that The dimension of the gap between the outer edge of the first collecting plate (2) and the inner wall of the shell (4) along the direction perpendicular to the first direction is 0.02 mm-0.06 mm.

30. An electrical equipment, characterized in that: Comprising a battery as described in any one of claims 1-29.

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