Cylindrical power battery cathode collector plate beneficial to liquid discharging and heat dissipation

Abstract

The utility model discloses a cylindrical power battery cathode collector plate beneficial to liquid discharging and heat dissipation, which comprises a plate body, a tail body and a connecting sheet, two ends of the connecting sheet are respectively connected with the plate body and the tail body, the plate body is of a sheet structure, a plurality of welding spots are arranged at different positions of the plate body at intervals, and the plate body is also provided with a liquid discharging groove and a liquid discharging hole. According to the mode, the negative current collecting plate is provided with the liquid discharging groove and the liquid discharging hole, so that the liquid inlet position during liquid injection is increased, the standing time of the battery cell after liquid injection is shortened, and the interior of the battery cell can be quickly infiltrated by electrolyte, thereby improving the overall production efficiency of the cylindrical power battery; the undesirable proportion of liquid emission is reduced; the cycle life of the cell is prolonged; a plurality of welding spots are arranged at different positions of the negative collector plate at intervals, and the welding spots are prevented from being concentrated at a certain position of the negative collector plate, so that the welding penetration risk of the negative collector plate during welding is well avoided, the welding strength can be improved, the internal resistance is reduced, and the welding reject ratio is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical power batteries, and particularly relates to a negative current collector plate of a cylindrical power battery which is beneficial to liquid injection and heat dissipation. Background Art

[0002] The cylindrical power battery, abbreviated as cylindrical battery, is a battery with high capacity, long cycle life and wide operating temperature range. The cylindrical power battery usually includes a battery cell, a housing, a cover plate, a negative current collector plate, a positive current collector plate, etc. Among them, the negative current collector plate is welded to the negative electrode tab of the battery cell through a solder joint to lead out the negative electrode of the battery. The existing negative current collector plate has the following technical problems: (1) In the liquid injection process of the cylindrical power battery, the electrolyte will be blocked by the negative current collector plate, which is not conducive to liquid injection, resulting in difficulty for the electrolyte to enter the interior of the battery cell, so that the standing time after the battery cell is injected with liquid is relatively long, that is, the interior of the battery cell cannot be wetted by the electrolyte quickly, thus affecting the overall production efficiency of the cylindrical power battery; (2) The solder joints of the existing negative current collector plate are concentrated at a certain position of the negative current collector plate, which easily causes the risk of welding through during welding and the welding strength is relatively low. Content of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] In view of the deficiencies of the prior art, the utility model provides a negative current collector plate of a cylindrical power battery which is beneficial to liquid injection and heat dissipation, and can solve the above technical problems.

[0005] (2) Technical Solutions

[0006] To solve the above technical problems, the utility model provides the following technical solutions: A negative current collector plate of a cylindrical power battery which is beneficial to liquid injection and heat dissipation, comprising: a disk body, a tail body and a connecting piece. The two ends of the connecting piece are respectively connected to the disk body and the tail body. The disk body is a sheet-like structure, and a plurality of solder joints are arranged at intervals at different positions of the disk body. The disk body is also provided with a liquid injection groove and a liquid injection hole.

[0007] Preferably, a plurality of identical welding straight line tracks are arranged at intervals on the disk body, and each welding straight line track includes a plurality of solder joints arranged at intervals.

[0008] Preferably, the plurality of welding straight line tracks are evenly distributed on the disk surface of the disk body.

[0009] Preferably, the number of the welding straight line tracks is six.

[0010] Preferably, the number of the liquid injection grooves is multiple, and the multiple liquid injection grooves are arranged at intervals on the edge of the disk body.

[0011] Preferably, the number of the liquid injection holes is multiple, and the multiple liquid injection holes are arranged at intervals on the disk surface of the disk body.

[0012] Preferably, the disk body is also provided with a central hole.

[0013] Preferably, the tail body is provided with a positioning groove and a rivet hole.

[0014] Preferably, the connecting piece is provided with a bending groove, and the bending groove is arranged close to the tail body.

[0015] Preferably, the connecting piece is also provided with a reinforcing rib.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present utility model provides a cylindrical power battery negative current collector plate that is conducive to liquid injection and heat dissipation, and has the following beneficial effects: (1) The negative current collector plate of the present utility model is provided with a liquid injection groove and a liquid injection hole, which increases the liquid injection position of the negative current collector plate during liquid injection, so that in the liquid injection process of the cylindrical power battery, the electrolyte can enter the battery cell through the liquid injection groove and the liquid injection hole of the negative current collector plate, shortening the standing time after liquid injection of the battery cell, enabling the inside of the battery cell to be wetted by the electrolyte more quickly, thereby improving the overall production efficiency of the cylindrical power battery, reducing the proportion of liquid leakage defects, and increasing the cycle life of the battery cell; (2) Multiple welding points are arranged at intervals at different positions of the negative current collector plate of the present utility model, avoiding the concentration of welding points at a certain position of the negative current collector plate, thus preferably avoiding the risk of welding through during welding of the negative current collector plate, and capable of improving the welding strength, reducing the internal resistance, and reducing the welding defect rate; (3) The liquid injection groove and the liquid injection hole can also improve the heat dissipation performance of the negative current collector plate of the present utility model. Description of the drawings

[0018] Figure 1 It is a top view of a negative current collector plate of a cylindrical power battery that is conducive to liquid injection and heat dissipation according to the present utility model;

[0019] Figure 2 It is a perspective view of a negative current collector plate of a cylindrical power battery that is conducive to liquid injection and heat dissipation according to the present utility model.

[0020] The reference numerals in the figure are: 1 disk body, 2 tail body, 3 connecting piece, 11 welding points, 12 liquid injection groove, 13 liquid injection hole, 14 welding straight line track, 15 central hole, 21 positioning groove, 22 rivet hole, 31 bending groove, 32 reinforcing rib. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] The utility model provides a cylindrical power battery negative current collector plate that facilitates liquid discharge and heat dissipation, including: a plate body 1, a tail body 2, and a connecting piece 3. The two ends of the connecting piece 3 are respectively connected to the plate body 1 and the tail body 2. In addition, the plate body 1, the tail body 2, and the connecting piece 3 are preferably integrally formed to form the negative current collector plate. The negative current collector plate of the utility model can specifically use nickel-copper tape as the raw material. The plate body 1 is a sheet-like structure, and a plurality of welding points 11 are spaced at different positions of the plate body 1. The plate body 1 is also provided with a liquid discharge groove 12 and a liquid discharge hole 13. The plate body 1 can specifically be a circular sheet-like structure.

[0023] In this embodiment, the plate body 1 is spaced with a plurality of identical welding straight line tracks 14. Each welding straight line track 14 includes a plurality of spaced welding points 11. It can be understood that the negative current collector plate is welded to the negative electrode tab of the cylindrical power battery cell through the welding points 11; further, the plurality of welding straight line tracks 14 are evenly distributed on the plate surface of the plate body 1, and the number of the welding straight line tracks 14 can specifically be six.

[0024] Preferably, the number of the liquid discharge grooves 12 is multiple, and the multiple liquid discharge grooves 12 are spaced at the edge of the plate body 1; the number of the liquid discharge holes 13 is multiple, and the multiple liquid discharge holes 13 are spaced on the plate surface of the plate body 1. The liquid discharge holes 13 are through holes. In this embodiment, the number of the liquid discharge grooves 12 is specifically three and evenly distributed at the edge of the plate body 1, and the number of the liquid discharge holes 13 is specifically three and evenly distributed on the plate surface of the plate body 1. It can be understood that in the liquid injection process of the cylindrical power battery, the electrolyte can enter the cell interior through the liquid discharge grooves 12 and the liquid discharge holes 13 of the negative current collector plate.

[0025] Preferably, the plate body 1 can also be provided with a central hole 15, which is opposite to the middle position of the cell. The central hole 15 helps the electrolyte or gas to quickly pass through the cell.

[0026] In addition, the above-mentioned tail body 2 can be provided with a positioning groove 21 and a rivet hole 22. The positioning groove 21 is used to position the negative current collector plate during the assembly of the cover plate of the cylindrical power battery to prevent misassembly of the negative current collector plate. The number of the positioning grooves 21 is two; the rivet hole 22 is used for riveting through rivets when the tail body 2 is assembled and connected to the cover plate, and the number of the rivet holes 22 can be two.

[0027] Preferably, the connecting piece 3 is provided with a bending groove 31, which is arranged close to the tail body 2. The bending groove 31 is used to facilitate the bending of the negative current collector plate at the designed position during the cell assembly; further, to prevent deformation of the negative current collector plate during bending, several reinforcing ribs 32 are provided on the connecting piece 3 near the bending position.

[0028] Compared with the prior art, the utility model provides a cylindrical power battery negative current collector plate that is conducive to liquid injection and heat dissipation, and has the following beneficial effects: (1) The negative current collector plate of the utility model is provided with a liquid injection groove and a liquid injection hole, which increases the liquid injection position of the negative current collector plate during liquid injection, so that in the liquid injection process of the cylindrical power battery, the electrolyte can enter the battery cell through the liquid injection groove and the liquid injection hole of the negative current collector plate, shortening the standing time after liquid injection of the battery cell, enabling the inside of the battery cell to be wetted by the electrolyte more quickly, thereby improving the overall production efficiency of the cylindrical power battery, reducing the proportion of liquid leakage defects, and improving the cycle life of the battery cell; (2) A plurality of welding points are arranged at intervals at different positions of the negative current collector plate of the utility model, avoiding the welding points being concentrated at a certain position of the negative current collector plate, thus better avoiding the risk of welding through during welding of the negative current collector plate, and being able to improve the welding strength, reduce the internal resistance, and reduce the welding defect rate; (3) The liquid injection groove and the liquid injection hole can also improve the heat dissipation performance of the negative current collector plate of the utility model.

[0029] It should be noted that the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0030] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A cylindrical power battery negative electrode current collector that is conducive to liquid discharge and heat dissipation, characterized in that: include: A disc body, a tail body and a connecting piece, the two ends of the connecting piece are respectively connected to the disc body and the tail body, the disc body is a sheet structure, a plurality of welding points are arranged at intervals at different positions of the disc body, and the disc body is also provided with a liquid lowering groove and a liquid lowering hole.

2. The negative electrode current collecting plate of a cylindrical power battery that facilitates liquid discharge and heat dissipation according to claim 1 is characterized in that: The disk body is provided with a plurality of identical welding linear tracks at intervals, and each of the welding linear tracks includes a plurality of welding points arranged at intervals.

3. The negative electrode current collecting plate of a cylindrical power battery that facilitates liquid discharge and heat dissipation according to claim 2 is characterized in that: The plurality of welding straight line tracks are evenly distributed on the disk surface of the disk body.

4. The negative electrode current collecting plate of a cylindrical power battery that facilitates liquid discharge and heat dissipation according to claim 3 is characterized in that: The number of the welding straight line tracks is six.

5. The negative electrode current collecting plate of a cylindrical power battery that facilitates liquid discharge and heat dissipation according to claim 1, characterized in that: The number of the lower liquid grooves is multiple, and the multiple lower liquid grooves are arranged at intervals on the edge of the disk body.

6. The negative electrode current collecting plate of a cylindrical power battery that facilitates liquid discharge and heat dissipation according to claim 3 is characterized in that: There are multiple lower liquid holes, and the multiple lower liquid holes are arranged at intervals on the disk surface of the disk body.

7. The negative electrode current collecting plate of a cylindrical power battery that facilitates liquid discharge and heat dissipation according to claim 1 is characterized in that: The disc body is also provided with a central hole.

8. The negative electrode current collecting plate of a cylindrical power battery that facilitates liquid discharge and heat dissipation according to claim 1 is characterized in that: The tail body is provided with a positioning groove and a rivet hole.

9. The negative electrode current collecting plate of a cylindrical power battery that facilitates liquid discharge and heat dissipation according to claim 8, characterized in that: The connecting piece is provided with a bending groove, and the bending groove is arranged close to the tail body.

10. The negative electrode current collecting plate of a cylindrical power battery that facilitates liquid discharge and heat dissipation according to claim 9, characterized in that: The connecting piece is also provided with reinforcing ribs.

Images