Connecting structure of multi-tab cluster electrode and collector plate, battery and manufacturing method of battery

Abstract

The invention discloses a multi-tab cluster electrode and collector plate connecting structure, a battery and a manufacturing method of the battery, and belongs to the technical field of lithium batteries, the multi-tab cluster electrode and collector plate connecting structure comprises a positive plate, a negative plate and collector plates, the positive plate is connected with one collector plate through a plurality of groups of positive tab clusters, and the negative plate is connected with the other collector plate through a plurality of groups of negative tab clusters; the positive electrode tab cluster comprises M positive electrode tabs, M is larger than or equal to 1, the negative electrode tab cluster comprises K negative electrode tabs, K is larger than or equal to 1, and the number of the positive electrode tab cluster and the negative electrode tab cluster is N. The current collecting plate comprises a plate body and a first group of through grooves to an Nth group of through grooves, and the first group of through grooves to the Nth group of through grooves are sequentially formed in different radius positions of the plate body from the center of the plate body to the outside. According to the structure, the ohmic impedance of the battery is effectively reduced, and the heat dissipation capability of the battery is improved. And the high-power charging and discharging capability of the battery is improved. And meanwhile, the manufacturing process of the battery is simplified, and the electrolyte injection efficiency is improved, so that the production efficiency of the battery is improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a connection structure of a multi-electrode cluster electrode and a current collecting disk, a battery, and a method for manufacturing the battery. Background Art

[0002] Lithium batteries are widely used in production and daily life due to their excellent charge and discharge performance. The traditional manufacturing process of cylindrical lithium batteries is to connect the tabs to the positive and negative plates through ultrasonic welding, and then weld the tabs to the battery terminals to form a current path. Due to the difficulty of the manufacturing process and the limitation of battery volume, the positive or negative tabs of the battery generally do not exceed two. Fewer tabs are not conducive to the rapid charge and discharge and high-current discharge of the battery. In order to improve the high-current charge and discharge performance of the battery and reduce battery heat, the latest technology uses a full-tab structure to increase the area of the tabs to meet the needs of rapid charge and discharge. The full-tab structure is manufactured using a tab flattening process, which requires the use of a positive electrode side coating process to prevent short circuits between the positive and negative tabs. However, the process is complicated, resulting in low product yield and increased manufacturing costs. The present invention adopts a new type of multiple-group tab cluster structure and a new connection structure with the current collecting plate, which not only improves the high-power charge and discharge performance of the battery and reduces battery heat, but also simplifies the flattening, side coating and other processes caused by the full-tab structure, improves the efficiency of electrolyte injection to achieve the needs of improving yield and reducing manufacturing costs. Summary of the Invention

[0003] One of the objectives of the present invention is to provide a connection structure between a multi-tab cluster electrode and a current collector plate, which addresses the problems of traditional single-tab and bi-tab batteries with insufficient rapid charge and discharge capabilities, weak heat dissipation, and insufficient tab connection strength. It also addresses the complex production process and low yield of all-tab batteries.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0005] A connection structure between an electrode and a current collecting disk of a multi-pole tab cluster includes a positive electrode sheet, a negative electrode sheet and a current collecting disk, wherein the positive electrode sheet is connected to the current collecting disk through multiple groups of positive electrode tab clusters, and the negative electrode sheet is connected to another current collecting disk through multiple groups of negative electrode tab clusters. The positive electrode tab cluster includes M positive electrode tabs with equal radius from the center of the current collecting disk, where M ≥ 1, and the number of positive electrode tab clusters is N. The negative electrode tab cluster includes K negative electrode tabs with equal radius from the center of the current collecting disk, where K ≥ 1, and the number of negative electrode tab clusters is N. The current collecting disk includes a first group of through grooves, a second group of through grooves and an Nth group of through grooves on a disk body, and the first group of through grooves, the second group of through grooves and the Nth group of through grooves are sequentially arranged at different radial positions on the disk body from the center of the disk body to the outside.

[0006] Furthermore, the positive electrode sheet includes a positive electrode body, a first group of positive electrode tab clusters to an N-th group of positive electrode tab clusters, the first group of positive electrode tab clusters to the N-th group of positive electrode tab clusters are respectively connected to the positive electrode body, and after the positive electrode sheet, the negative electrode sheet, and the diaphragm are wound into a roll core, the first group of positive electrode tab clusters are connected to the disc body after passing through the first group of through grooves, and the N-th group of positive electrode tab clusters are connected to the disc body after passing through the N-th group of through grooves; the negative electrode sheet includes a negative electrode body, a first group of negative electrode tab clusters to an N-th group of negative electrode tab clusters, the first group of negative electrode tab clusters to the N-th group of negative electrode tab clusters are respectively connected to the negative electrode body, and after the positive electrode sheet, the negative electrode sheet, and the diaphragm are wound into a roll core, the first group of negative electrode tab clusters are connected to the disc body after passing through the first group of through grooves, and the N-th group of negative electrode tab clusters are connected to the disc body after passing through the N-th group of through grooves.

[0007] Furthermore, the positive electrode tab clusters correspond to the through slots one by one, each group of positive electrode tab clusters passes through the corresponding through slots respectively, and the portion of each group of positive electrode tab clusters that exceeds the positive electrode current collecting disk is bent toward the center of the circle; the negative electrode tab clusters correspond to the through slots one by one, each group of negative electrode tab clusters passes through the corresponding through slots respectively, and the portion of each group of negative electrode tab clusters that exceeds the negative electrode current collecting disk is bent toward the center of the circle.

[0008] Furthermore, the first group of through grooves to the Nth group of through grooves are arranged on the disk body in sequence along the radial direction of the disk body, or the first group of through grooves to the Nth group of through grooves are staggered along the radial direction of the disk body or staggered at any angle on the disk body, which can meet the connection requirements of multiple groups with different numbers of tabs in each group.

[0009] Preferably, it also includes a tab cluster welding layer and a current collecting disc welding layer, wherein the tab cluster welding layer is respectively arranged between the bent part of the positive tab cluster and the positive current collecting disc, and between the bent part of the negative tab cluster and the negative current collecting disc; the current collecting disc welding layer is respectively arranged between the connecting piece and the cover plate or the positive electrode column of the positive electrode current collecting disc, and between the central groove of the negative electrode current collecting disc and the bottom of the shell or the negative electrode column.

[0010] Preferably, the current collecting disc includes a positive current collecting disc and a negative current collecting disc. The positive current collecting disc also includes an insulating layer, which is configured to surround the bottom and sides of the disc body. The insulating layer is integrally formed with the disc body. The center hole and through-groove position of the insulating layer are consistent with those of the current collecting disc, which can simplify the electrode edge coating process and reduce the manufacturing process cost while achieving safety protection. The insulating pad of the negative current collecting disc is a separate plastic gasket with a center opening, which is located between the negative current collecting disc and the bottom of the shell or the negative electrode pole.

[0011] More preferably, the radius of the first group of through grooves is the smallest, and the radius of the Nth group of through grooves is the largest, and they are arranged in an arc shape around the center of the disk body to meet the manufacturing requirements of cylindrical batteries.

[0012] Furthermore, the current collecting disc includes a positive current collecting disc and a negative current collecting disc. The positive current collecting disc has a through hole in the middle and a connecting piece on the side. The negative current collecting disc has a groove in the middle for connecting the positive and negative electrodes of the battery cell housing respectively.

[0013] A second object of the present invention is to provide a battery that solves the problems of insufficient connection strength of the tabs of traditional single and double batteries, poor rapid charging and discharging capabilities, and weak heat dissipation capabilities.

[0014] A battery comprises the connection structure of the multi-electrode cluster electrode and the current collecting disk and a diaphragm, wherein the diaphragm is arranged between the positive electrode sheet and the negative electrode sheet.

[0015] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0016] A battery comprises the positive electrode sheet, the negative electrode sheet, a separator, and the electrode sheet and current collecting plate connection structure of the tab cluster, wherein the separator is arranged between the positive electrode sheet and the negative electrode sheet.

[0017] A third object of the present invention is to provide a method for manufacturing a battery, which simplifies the complex tab flattening and edge coating processes required in the existing full-tab battery manufacturing, resulting in low battery yield and high manufacturing cost.

[0018] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0019] A method for manufacturing a battery, comprising the following steps:

[0020] S1. Winding: The positive electrode sheet, the negative electrode sheet and the separator are wound to form a battery cell;

[0021] S2. Perforation: Multiple groups of positive electrode tab clusters and multiple groups of negative electrode tab clusters are respectively located at the two ends of the battery cell, and the positive electrode tab clusters are passed through the through slots of the positive current collecting disk, and the part of the positive electrode tab cluster that passes through the current collecting disk is bent toward the center of the disk body, and the positive electrode tab cluster of the bent part is parallel to and in contact with the end face of the current collecting disk; the negative electrode tab cluster is passed through the through slots of the current collecting disk, and the negative electrode tab cluster is bent toward the center of the disk body after passing through the through slots, and the negative electrode tab of the bent part is parallel to and in contact with the end face of the current collecting disk.

[0022] S3, welding: welding the bent portion of the positive electrode tab cluster and the bent portion of the negative electrode tab cluster to the disk bodies of the positive electrode current collecting disk and the negative electrode current collecting disk respectively;

[0023] S4. Connecting the current collecting plates: The two welded current collecting plates are welded to the battery cap or positive electrode post and the bottom of the battery case or negative electrode post, respectively. The positive and negative electrode sheets are connected to the current collecting plates via multiple sets of tab clusters, increasing the conductive path, improving connection strength, and simplifying the manufacturing process.

[0024] The beneficial effects of the present invention are:

[0025] (1) The connection structure between the electrode sheet and the current collector disk of this multi-electrode tab cluster is achieved by connecting the multiple tab clusters on the positive and negative electrode sheets through multiple slots on the current collector disk body and then connecting to the disk body, thereby reducing impedance and reducing temperature rise. At the same time, the through holes and slots on the disk body improve the electrolyte penetration efficiency. The current collector disk covers both ends of the winding core to prevent metal debris from entering during processing, thereby improving the yield rate of battery manufacturing.

[0026] (2) The connection structure between the electrode sheet and the current collecting disk of the multi-electrode cluster is provided with an insulating layer on the current collecting disk. The positive electrode insulating layer covers the bottom of the disk body to prevent the positive electrode tab and the negative electrode sheet from short-circuiting, which can simplify or even omit the positive electrode edge coating process. The insulating layer on the edge of the current collecting disk can prevent the current collecting disk from short-circuiting with the shell, which can simplify other processes such as wrapping with insulating tape and improve efficiency. The insulating layer and the current collecting disk are integrally formed, which simplifies the battery cell manufacturing process and reduces manufacturing costs.

[0027] (3) The manufacturing method of this battery connects multiple tab clusters on the positive and negative electrodes to the current collecting plate, reducing the battery's ohmic impedance and improving the battery's rapid charge and discharge capabilities. The tabs that pass through the current collecting plate are bent and then welded to the plate body. The welding process is simple and improves the connection strength between the tabs and the current collecting plate. This greatly reduces the risk of poor welding between the current collecting plate and the tab flattening layer caused by the full-tab battery process, and improves the structural reliability of the battery under vibration, impact, and drop. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the battery core forming process provided by the present invention;

[0029] Figure 2 A structural diagram of the electrode sheet provided by the present invention;

[0030] Figure 3 A plan view of the positive electrode current collecting disk provided by the present invention;

[0031] Figure 4 A plan view of the negative electrode current collecting disc provided by the present invention;

[0032] Figure 5 A cross-sectional view of the positive electrode current collecting disc provided by the present invention;

[0033] Figure 6 A cross-sectional view of the negative electrode current collecting disc provided by the present invention;

[0034] Figure 7 A top view of the positive electrode connection structure provided by the invention;

[0035] Figure 8 This is a diagram of the battery cell structure provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0036] Example 1

[0037] like Figure 1-Figure 7 The embodiment shown in the figure discloses a connection structure of a multi-electrode cluster electrode and a current collecting disk, including a positive electrode sheet, a negative electrode sheet and a current collecting disk, the current collecting disk including a positive electrode current collecting disk 2 and a negative electrode current collecting disk 1, the positive electrode sheet is connected to the positive electrode current collecting disk 2 through multiple groups of positive electrode tab clusters, and the negative electrode sheet is connected to the negative electrode current collecting disk 1 through multiple groups of negative electrode tab clusters. The tab clusters are composed of multiple tabs. The positive electrode current collecting disk 2 and the negative electrode current collecting disk 1 both include a disk body 11, a first group of through slots 12 to an Nth group of through slots. The current collecting disk in this embodiment includes the Nth group of through slots. A group of through grooves 12 and a second group of through grooves 13 are arranged on the disk body 11 in sequence from the center of the disk body to the outside. The first group of through grooves 12 and the second group of through grooves 13 both penetrate the disk body 11 and are used for the positive electrode ear clusters and the negative electrode ear clusters to pass through the current collecting disk, and play a role in accelerating the absorption rate of the electrolyte, which can improve the connection strength between the positive electrode sheet and the negative electrode sheet and the current collecting disk, reduce the ohmic impedance and facilitate welding processing, thereby improving the overall charge and discharge performance and simplifying the process.

[0038] The greater the number of tabs in a battery, the lower its ohmic impedance, facilitating high-power charging and discharging, and reducing temperature rise. The present invention employs a multi-tab structure, which more effectively reduces the battery's ohmic impedance than the traditional single-tab and dual-tab structure. Theoretically, when the N value is large, a similar low-impedance effect as a full-tab structure can be achieved, enabling high-power charging and discharging, simplifying the production process, and improving yield.

[0039] Specifically, the first group of through slots 12 is a plurality of slot holes symmetrically distributed within the same radius.

[0040] Among them, the middle part of the positive current collecting disc 2 is provided with a through hole 25, the middle part of the negative current collecting disc 1 is provided with a groove 14, the positive current collecting disc 2 is connected to the pole ear cluster formed by multiple positive pole ears, and the negative pole current disc 1 is connected to the pole ear cluster formed by multiple negative pole ears ( Figure 2 The positive electrode tab cluster and the negative electrode tab cluster are respectively composed of M positive electrode tabs and K negative electrode tabs with equal radius from the center of the collecting disk.

[0041] Furthermore, the positive electrode sheet includes a positive electrode body 28, a first group of positive electrode ear clusters to an N-th group of positive electrode ear clusters, the first group of positive electrode ear clusters to the N-th group of positive electrode ear clusters are respectively connected to the positive electrode body 28, and after winding, the first group of positive electrode ear clusters pass through the first group of through grooves and are connected to the disc body, and the N-th group of positive electrode ear clusters pass through the N-th group of through grooves and are connected to the disc body; the negative electrode sheet includes a negative electrode body, a first group of negative electrode ear clusters to an N-th group of negative electrode ear clusters, the first group of negative electrode ear clusters to the N-th group of negative electrode ear clusters are respectively connected to the negative electrode body, and the winding After winding, the first group of negative electrode tab clusters passes through the first group of through slots and is connected to the disc body, and the Nth group of negative electrode tab clusters passes through the Nth group of through slots and is connected to the disc body; specifically, the first positive electrode tab 26 and the second positive electrode tab 27 are respectively connected to the positive electrode body 28, the first positive electrode tab 26 passes through the first group of through slots 12 and is connected to the disc body 11, and the second positive electrode tab 27 passes through the second group of through slots 13 and is connected to the disc body 11; the negative electrode sheet includes the negative electrode body 18, the first group of negative electrode tabs 16 and the second group of negative electrode tabs 17, until the Nth group of negative electrode tab clusters. The first group of negative ears 16 and the second group of negative ears 17 are respectively connected to the negative electrode body 18. The first group of negative ears 16 are connected to the disc body 11 after passing through the first group of through grooves 12, and the second negative ears 17 are connected to the disc body 11 after passing through the second group of through grooves 13. The structures of the positive and negative electrode sheets after forming are similar. The positive ears are connected to the edge of the positive electrode body 28. Multiple groups of positive ears are arranged in sequence on the edge of the positive electrode body 28 in a form away from the center and symmetrical to each other. The number of positive and negative ears can be set to different numbers according to the requirements of the battery charging and discharging power.

[0042] Furthermore, the positive electrode tab clusters correspond to the through slots one by one, and each group of positive electrode tab clusters passes through the corresponding through slots respectively, and the tabs pass through the portion exceeding the positive electrode current collecting disk 2 and are bent; the negative electrode tab clusters correspond to the through slots one by one, and each group of negative electrode tab clusters passes through the corresponding through slots respectively, and each group of negative electrode tab clusters passes through the negative electrode current collecting disk 1 and the portion exceeding is bent. Specifically, a positive bent portion 261 is provided on the first positive tab 26 and / or the second positive tab 27, and the positive bent portion 261 passes through the disk body 11 and overlaps with the disk body 11, and a negative tab is provided on the first negative tab 16 and / or the second negative tab 17. The bent portion 161, the negative bent portion 161 passes through the disk body 11 and overlaps with the disk body 11, the positive bent portion 261 and the negative bent portion 161 strengthen the connection strength with the positive electrode sheet and the negative electrode sheet and the current collecting disk, and the positive bent portion 261 and the negative bent portion 161 and the disk body 11 are respectively welded to form a positive welding layer 32 and a negative welding layer 31. The welding connection improves the connection strength and the welding direction is on the outside of the current collecting disk. The pole ear is bent toward the center of the circle through a bending process, and the bent portion of the pole ear is close to the surface of the current collecting disk, which is convenient for welding and improves the yield rate.

[0043] See also Figure 3 and Figure 4Furthermore, the first group of through grooves 12 and the second group of through grooves 13 are sequentially arranged on the disk body 11 along the radial direction of the disk body 11, and the first positive electrode ear 26 and the second positive electrode ear 27 and the first negative electrode ear 16 and the second negative electrode ear 17 on the battery cell are distributed at both ends of the battery cell, which is convenient for passing through the disk body 11 and welding; the first group of through grooves 12 and the second group of through grooves 13 are staggered along the radial direction of the disk body 11 or staggered at any angle on the disk body 11, which can locate the position of the collecting disk and prevent mutual interference between the ears.

[0044] More preferably, a connecting piece 15 extends outward from one side wall of the disk body 11 of the positive electrode current collector disk 2. The connecting piece 15 is used to connect to the positive electrode column or cap assembly. Preferably, it also includes a tab cluster welding layer and a current collector disk welding layer. The tab cluster welding layer is respectively arranged between the bent portion of the positive electrode tab cluster and the positive electrode current collector disk 2, and between the bent portion of the negative electrode tab cluster and the negative electrode current collector disk 1; the current collector disk welding layer is respectively between the connecting piece 15 of the positive electrode current collector disk 2 and the cover plate or the positive electrode column, and between the central groove of the negative electrode current collector disk 1 and the bottom of the shell or the negative electrode column. Specifically, a negative electrode welding layer 31 is provided between the first negative electrode ear 16 and the disc body 11 and between the second negative electrode ear 17 and the disc body 11; a positive electrode welding layer is provided between the first group of positive electrode ears 26 and the disc body 11 and between the second group of positive electrode ears 27 and the disc body 11, for connecting the disc body 11 and the electrode ears. The welded connection has high strength and low internal resistance. In addition, a current collecting disc welding layer is provided between the connecting piece 15 and the cover plate of the positive current collecting disc 2 and between the central groove of the negative current collecting disc 1 and the bottom of the shell, for forming a current path.

[0045] More preferably, the positive electrode current collector 2 also includes an insulating layer 4, which is configured to surround the bottom and sides of the disc body 11. The insulating layer 4 is integrally formed with the disc body 11. The insulating layer 4 is used to separate the tabs from the battery cell to prevent the two from contacting and short-circuiting. In addition, the use of the insulating layer 4 can omit the edge coating process of the electrode sheet, saving production costs; the side protective layer is beneficial to prevent the current collector and the shell from short-circuiting, and the subsequent insulating tape wrapping process can be omitted. In addition, an insulating pad is provided at the bottom of the negative electrode current collector 1. The insulating pad of the negative electrode current collector 1 is a separate plastic gasket with a central opening, located between the negative electrode current collector 1 and the bottom of the shell or the negative electrode pole, and is used to separate the bottom of the shell and the current collector to prevent external processing overheating from causing a short circuit in the battery. Specifically, the insulating layer 4 is consistent with the position of the through holes and through slots on the disc body 11. The insulating pad on the negative electrode current collector 1 is an independent plastic gasket with a central opening, located between the negative electrode current collector 1 and the bottom of the shell or the negative electrode pole.

[0046] More preferably, the first group of through grooves 12 and the second group of through grooves 13 are arranged in an arc shape around the center of the disc body 11, which can be matched with existing cylindrical batteries. The radius of the first group of through grooves 12 is the smallest, and the radius of the Nth group of through grooves is the largest, and is arranged in an arc shape around the center of the disc body 11. The length of the first group of through grooves 12 is smaller than the length of other through grooves, and the length of the first group of through grooves 12 is smaller than the length of the second group of through grooves 13, which can meet the connection needs of different numbers of tabs.

[0047] More preferably, the cross-section of the disk body 11 is set to be circular or polygonal, and the positive electrode curved portion 261 and the negative electrode curved portion 161 are parallel to the end face of the disk body 11, with a large overlapping area, which is convenient for welding and increasing the current path. The disk body 11 is aimed at existing cylindrical batteries, and the current collecting plate can cover the end of the cylindrical battery to prevent metal debris generated during processing from entering the battery cell and causing a short circuit in the battery cell.

[0048] Example 2

[0049] like Figure 8 As shown, this embodiment discloses a connection structure of a multi-electrode cluster electrode sheet and a current collecting disk, wherein the positive electrode bent portion 261 on the first positive electrode ear 26 and / or the second positive electrode ear 27 extends outward and is dead-edge formed to form a positive electrode folded portion 262. The positive electrode folded portion 262 overlaps with the positive electrode bent portion 261 to increase the connection thickness between the electrode ear and the disk body 11, thereby improving the connection strength. At the same time, it prevents the electrode ear from being welded through during laser welding, thereby improving the product yield rate. Similarly, the negative electrode bent portion 161 of the first negative electrode ear 16 and / or the second negative electrode ear 17 extends outward and is dead-edge formed to form a negative electrode folded portion 162. The negative electrode folded portion 162 overlaps with the negative electrode bent portion 161 to improve the connection strength between the electrode ear and the disk body 11.

[0050] Example 3

[0051] This embodiment discloses a battery, including a connection structure of a multi-electrode cluster electrode sheet and a current collecting disk, and a diaphragm. The diaphragm is arranged between the positive electrode sheet and the negative electrode sheet. The diaphragm, the positive electrode sheet and the negative electrode sheet are wound to form a core body 3. The core body 3 is wound into a circular shape, which has the advantages of a compact structure and high energy density. The connection structure of the multi-electrode cluster and the current collecting disk is arranged at both ends of the core body 3 to form a large-area current path during use.

[0052] The specific manufacturing process of the battery is as follows:

[0053] The blank foil on the sides of the positive and negative electrodes is cut to form multiple groups of positive and negative electrodes respectively. The positive and negative electrodes and the separator are wound into a battery cell. The current collecting plates are placed on both ends of the battery cell respectively. The positive electrode is installed on the positive electrode, and the negative electrode is installed on the negative electrode. The positive and negative electrodes are passed through the first and second groups of through grooves 12 and 13 on the positive and negative electrode current collecting plates 2 and 1, respectively. The parts of the positive and negative electrodes that pass through the disc body 11 are bent to be parallel to the disc body 11. The positive bent portion 261 and the negative bent portion 161 are welded to the disc body 11 by a welding machine. After the welding is completed, the current collecting plates are welded to the negative electrode shell and the positive electrode cap of the battery respectively to form a complete internal current path.

[0054] Example 4

[0055] This embodiment discloses a method for manufacturing a battery, which includes the following steps:

[0056] S1, winding: the positive electrode sheet, negative electrode sheet and separator are wound to form a battery cell;

[0057] S2. Perforation: Multiple groups of positive electrode tab clusters and multiple groups of negative electrode tab clusters are respectively placed at both ends of the battery cell. The positive electrode tab cluster is passed through the through slot of the current collecting disk, and the part of the positive electrode tab cluster that passes through the current collecting disk is bent toward the center of the disk body. The positive electrode tab cluster at the bent part is parallel to and in contact with the end face of the current collecting disk; the negative electrode tab cluster is passed through the through slot of the current collecting disk, and after passing through the through slot, the negative electrode tab cluster is bent toward the center of the disk body. The negative electrode tab at the bent part is parallel to and in contact with the end face of the current collecting disk; specifically, the positive and negative tabs are bent toward the center of the disk body 11 after passing through the disk body 11 to form a positive bent portion 261 and a negative bent portion 161, thereby improving the connection strength between the tabs and the disk body 11, preventing the tabs and the disk body 11 from becoming desolderable, and enhancing the heat dissipation capacity;

[0058] S3. Welding: Weld the positive curved portion 261 and the negative curved portion 161 to the disc body 11 respectively. Laser welding is used to weld the positive curved portion 261 and the negative curved portion 161 to the current collecting disc from the outside of the battery cell. The welding operation is simple and the welding efficiency is high.

[0059] S4. Connecting the current collecting plates: Weld the two welded current collecting plates to the battery cap and outer shell respectively to form a complete battery structure.

[0060] Specifically, electrode coating and rolling: zebra stripe coating is used to evenly apply the positive and negative electrode slurries on the aluminum copper foil respectively, and blank foil parts are left on one side of the positive and negative electrodes, reserved for cutting the electrode ear clusters, and pre-cutting is completed after rolling; die cutting: laser die cutting is used to cut the blank foils of the positive and negative electrode sheets after rolling to form positive and negative electrode ear clusters; winding: the positive electrode sheet, negative electrode sheet and diaphragm are wound into a battery cell; the positive and negative electrode ears are respectively led out from the two ends of the winding core; bending: multiple groups of positive electrode ear clusters and negative electrode ear clusters are respectively arranged at the two ends of the battery cell, and the positive electrode ear cluster is passed through the through slot of the positive current collecting disk 2, and the extended part of the positive electrode ear cluster is bent toward the center of the disk body 11, and the positive electrode ear cluster of the bent part is bent. Parallel to and in contact with the end face of the current collecting disk, take the negative pole ear cluster and pass it through the through slot of the negative pole collector disk, and bend toward the center of the disk body 11 after passing through the through slot. The negative pole ear and the bent part of the negative pole ear are parallel to and in contact with the end face of the current collecting disk; welding: weld the extended part of the positive pole ear cluster to the positive current collecting disk 2, and weld the extended part of the negative pole ear cluster to the negative current collecting disk 1; weld the groove 14 of the negative current collecting disk 1 to the bottom of the battery shell or the negative pole post, and weld the connecting piece 15 of the positive current collecting disk 2 to the bottom of the battery cap or the bottom of the positive pole post, so as to realize the connection between the positive pole of the battery cell and the cap or the positive pole post, and the connection between the negative pole of the battery cell and the bottom of the battery shell or the negative pole post, and form a passage inside the battery.

[0061] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A connection structure between a multi-electrode cluster electrode and a current collecting plate, characterized in that: It includes a positive electrode sheet, a negative electrode sheet and a current collecting disk, the positive electrode sheet is connected to the current collecting disk through multiple groups of positive electrode tab clusters, and the negative electrode sheet is connected to another current collecting disk through multiple groups of negative electrode tab clusters. The positive electrode tab cluster includes M positive electrode tabs with equal radius from the center of the current collecting disk, where M≥1, and the number of positive electrode tab clusters is N. The negative electrode tab cluster includes K negative electrode tabs with equal radius from the center of the current collecting disk, where K≥1, and the number of negative electrode tab clusters is N. The current collecting disk includes a disk body, a first group of through grooves to an Nth group of through grooves, and the first group of through grooves to the Nth group of through grooves are sequentially arranged at different radial positions of the disk body from the center of the disk body to the outside.

2. The connection structure of the multi-electrode cluster electrode and the current collecting disk according to claim 1, characterized in that: The positive electrode sheet includes a positive electrode body, a first group of positive electrode tab clusters to an N-th group of positive electrode tab clusters, the first group of positive electrode tab clusters to the N-th group of positive electrode tab clusters are respectively connected to the positive electrode body, after the positive electrode sheet, the negative electrode sheet, and the separator are wound into a roll core, the first group of positive electrode tab clusters are connected to the disc body after passing through the first group of through grooves, and the N-th group of positive electrode tab clusters are connected to the disc body after passing through the N-th group of through grooves; the negative electrode sheet includes a negative electrode body, a first group of negative electrode tab clusters to an N-th group of negative electrode tab clusters, the first group of negative electrode tab clusters to the N-th group of negative electrode tab clusters are respectively connected to the negative electrode body, after the positive electrode sheet, the negative electrode sheet, and the separator are wound into a roll core, the first group of negative electrode tab clusters are connected to the disc body after passing through the first group of through grooves, and the N-th group of negative electrode tab clusters are connected to the disc body after passing through the N-th group of through grooves.

3. The connection structure between the multi-electrode cluster electrode and the current collecting disk according to claim 2, characterized in that: The positive electrode tab clusters correspond to the through slots one by one, and each group of positive electrode tab clusters passes through the corresponding through slots respectively. After each group of positive electrode tab clusters passes through the positive electrode current collecting disk, the excess part is bent toward the center of the circle; the negative electrode tab clusters correspond to the through slots one by one, and each group of negative electrode tab clusters passes through the corresponding through slots respectively. After each group of negative electrode tab clusters passes through the negative electrode current collecting disk, the excess part is bent toward the center of the circle.

4. The connection structure between the multi-electrode cluster electrode and the current collecting disk according to claim 3, characterized in that: The first to Nth groups of through grooves are sequentially arranged on the disc body along the radial direction of the disc body, or the first to Nth groups of through grooves are staggered along the radial direction of the disc body or staggered at any angle on the disc body.

5. The connection structure between the multi-electrode cluster electrode and the current collecting disk according to claim 1, characterized in that: It also includes a tab cluster welding layer and a current collecting disc welding layer, wherein the tab cluster welding layer is respectively arranged between the bent portion of the positive tab cluster and the positive current collecting disc, and between the bent portion of the negative tab cluster and the negative current collecting disc; the current collecting disc welding layer is respectively arranged between the connecting piece and the cover plate or the positive pole column of the positive pole current collecting disc, and between the central groove of the negative pole current collecting disc and the bottom of the shell or the negative pole column.

6. The connection structure between a multi-electrode cluster electrode and a current collecting disk according to claim 1, characterized in that: The current collecting disc includes a positive current collecting disc and a negative current collecting disc. The positive current collecting disc also includes an insulating layer, which is arranged to surround the bottom and sides of the disc body. The insulating layer is integrally formed with the disc body. The center hole and through groove position of the insulating layer are consistent with those of the current collecting disc. The insulating pad of the negative current collecting disc is a separate plastic gasket with a center opening, which is located between the negative current collecting disc and the bottom of the shell or the negative electrode pole.

7. The connection structure between the multi-electrode cluster electrode and the current collecting disk according to claim 6, characterized in that: The first group of through slots has the smallest radius, and the Nth group of through slots has the largest radius, and are arranged in an arc shape around the center of the disk body.

8. The connection structure between a multi-electrode cluster electrode and a current collecting disk according to claim 1, characterized in that: The current collecting disc includes a positive current collecting disc and a negative current collecting disc. A through hole is provided in the middle of the positive current collecting disc and a connecting piece is provided on the side. A groove is provided in the middle of the negative current collecting disc.

9. A battery, characterized in that: The invention comprises the connection structure of the multi-electrode cluster electrode and the current collecting disk according to any one of claims 1 to 8, and a diaphragm, wherein the diaphragm is arranged between the positive electrode sheet and the negative electrode sheet.

10. A battery manufacturing method, characterized in that: The manufacturing of the battery according to claim 9 comprises the following steps: S1. Winding: The positive electrode sheet, the negative electrode sheet and the separator are wound to form a battery cell; S2. Perforation: Multiple groups of positive electrode tab clusters and multiple groups of negative electrode tab clusters are respectively located at both ends of the battery cell. The positive electrode tab clusters are passed through the through slots of the positive current collecting disk, and the portion of the positive electrode tab cluster that passes through the current collecting disk is bent toward the center of the disk body, with the positive electrode tab cluster at the bent portion being parallel to and in contact with the end surface of the current collecting disk; the negative electrode tab clusters are passed through the through slots of the current collecting disk, and the negative electrode tab clusters are bent toward the center of the disk body after passing through the through slots, with the negative electrode tabs at the bent portion being parallel to and in contact with the end surface of the current collecting disk; S3, welding: welding the bent portion of the positive electrode tab cluster and the bent portion of the negative electrode tab cluster to the disk bodies of the positive electrode current collecting disk and the negative electrode current collecting disk respectively; S4. Connecting the current collecting plates: Welding the two welded current collecting plates to the battery cap or the positive electrode post and the bottom of the battery shell or the negative electrode post respectively.

Images