Collector plate for power battery and power battery

Abstract

The utility model discloses a collector plate for a power battery and the power battery. The collector plate comprises a plate body, the middle of the plate body is punched upwards to form a torque sinking groove welding area, a plurality of hollow grooves are distributed in the position, close to the torque sinking groove welding area, of the plate body in the circumferential direction, and the hollow grooves are configured to be capable of deforming when the torque sinking groove welding area is impacted by torque. During torque welding, the deformation of the hollow groove can counteract the torque impact on the torque sinking groove welding area, so that the fatigue of the edge material of the torque sinking groove welding area is avoided, and the problems of insufficient internal electric connection strength of the power battery and open circuit risk caused by the fatigue of the edge material of the torque sinking groove welding area are avoided. Meanwhile, as the deformation of the hollow-out groove can counteract the torque impact borne by the torque sinking groove welding area, the welding friction during torque welding is reduced, metal chips brought by the torque welding area can be reduced, the risks of fire and explosion of the power battery can be improved, and the safety performance and the anti-seismic performance of the power battery are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field especially relates to a current collecting disc for power battery and power battery. BACKGROUND

[0002] At present, lithium ion / sodium ion cylindrical power battery gradually becomes the mainstream product of new energy industry because of high energy density, good capacity consistency, can support high rate charge and discharge and other advantages. More and more manufacturers continuously pursue the compactness optimization of cylindrical battery structure to improve energy density. However, the following common problems exist:

[0003] (1) Cylindrical sodium ion power battery, negative pole adopts aluminum current collecting disc, when being torque welded with shell bottom, violent torque impact is easy to cause material fatigue around welding area, leading to insufficient battery electrical connection strength, and easily causing open circuit and other problems.

[0004] (2) Cylindrical sodium ion power battery, negative pole adopts aluminum current collecting disc, when being torque welded with shell bottom, violent torque impact is easy to cause more metal scraps around welding area, and the flying metal scraps bring fire, explosion and other safety risks to the battery.

[0005] (3) Cylindrical lithium ion power battery, positive pole aluminum current collecting disc and aluminum pole are also faced with the above similar problems when being torque welded. INVENTION CONTENTS

[0006] The utility model discloses a current collecting disc for power battery and power battery can give consideration to the valve sensitivity of explosion-proof valve and the structural strength of explosion-proof valve.

[0007] In order to realize the above-mentioned purpose, the utility model provides a current collecting disc for power battery, the current collecting disc includes disc body, the middle part of disc body is formed torque sink welding area by being punched upwards, a plurality of hollow grooves are distributed in the position close to torque sink welding area of disc body circumferentially, and the hollow groove is configured to be deformed when torque sink welding area is impacted by torque.

[0008] Optionally, the shape of the hollow groove is approximately S-shaped, one end of which is close to the torque sink welding area, and the other end of which is away from the torque sink welding area.

[0009] Optionally, each hollow groove is uniformly distributed on the current collecting disc circumferentially.

[0010] Optionally, each hollow groove is rotationally symmetrical about the center of the torque sink welding area.

[0011] Optionally, the number of hollow grooves is six.

[0012] Optionally, the disc body is formed full tab sink welding area by being punched downwards.

[0013] Optionally, a plurality of full-tab slot welding areas are circumferentially distributed on the disc body.

[0014] Optionally, a plurality of liquid permeation through holes are formed on the disc body.

[0015] Optionally, a plurality of full-tab slot welding areas and a plurality of liquid permeation through holes are formed on the disc body, and the plurality of full-tab slot welding areas and the plurality of liquid permeation through holes are alternately arranged in the circumferential direction.

[0016] In order to achieve the above-mentioned purpose, the utility model provides a power battery, including the current collecting disc for power battery as mentioned in the preceding.

[0017] In the embodiment of the utility model, the disc body of the current collecting disc is circumferentially distributed with a plurality of hollow grooves at the position close to the torque slot welding area, and the hollow grooves can deform when the torque slot welding area is impacted by torque. Further, in the torque welding, the deformation of the hollow grooves can offset (at least partially) the torque impact on the torque slot welding area, avoiding the edge material of the torque slot welding area from being fatigued, and avoiding the problem of insufficient internal electrical connection strength of the power battery due to the fatigue of the edge material of the torque slot welding area, and the risk of open circuit. At the same time, since the deformation of the hollow grooves can offset the torque impact on the torque slot welding area, the welding friction in the torque welding is reduced, and further, the metal chips caused by the torque welding area can be reduced, which is beneficial to improve the risk of fire and explosion of the power battery, and improve the safety performance and shock resistance of the power battery. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the structure schematic view of the current collecting disc for power battery of the embodiment of the utility model.

[0019] Figure 2 is the structure schematic view of the current collecting disc for power battery of the embodiment of the utility model from another perspective.

[0020] Figure 3 is the structure schematic view of the winding core and the current collecting disc of the embodiment of the utility model.

[0021] Figure 4 is the cross-sectional structure schematic view of the power battery of the embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to explain the technical content, structural features and effects of the utility model in detail, the following will be described in detail in combination with the embodiments and the drawings.

[0023] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0024] Please refer to Figures 1 to 4 The utility model discloses an example discloses a kind of current collecting disc 1 for power battery, current collecting disc 1 includes disc body 11, the middle part of disc body 11 is formed torque sink welding area 12 by being punched upwards, disc body 11 is distributed with multiple hollow grooves 13 (at least two) in the position close to torque sink welding area 12 circumferentially, hollow groove 13 is configured to be able to deform when torque sink welding area 12 is impacted by torque.

[0025] In the embodiments of the present application, disc body 11 of current collecting disc 1 is distributed with multiple hollow grooves 13 in the position close to torque sink welding area 12 circumferentially, and hollow groove 13 can deform when torque sink welding area 12 is impacted by torque. Further, in torque welding, the deformation of hollow groove 13 can offset (at least partially) the torque impact on torque sink welding area 12, to avoid the edge material of torque sink welding area 12 from being fatigued, and to avoid the problem of insufficient internal electrical connection strength of power battery caused by the fatigue of the edge material of torque sink welding area 12, and the risk of open circuit. At the same time, since the deformation of hollow groove 13 can offset the torque impact on torque sink welding area 12, the welding friction in torque welding is reduced, and thus the metal chips caused by torque welding area can be reduced, which is beneficial to improve the risk of fire and explosion of power battery, and to improve the safety performance and shock resistance of power battery.

[0026] In some embodiments, the shape of hollow groove 13 is approximately S-shaped, with one end close to torque sink welding area 12 and the other end away from torque sink welding area 12. It has been verified that, by setting hollow groove 13 to be S-shaped with one end close to torque sink welding area 12 and the other end away from torque sink welding area 12, hollow groove 13 can effectively deform to offset the torque impact on torque sink welding area 12 when torque welding is performed. Of course, the shape of hollow groove 13 is not specifically limited, as long as hollow groove 13 can deform to offset the torque impact when torque sink welding area 12 is impacted by a certain torque.

[0027] In some embodiments, each hollow groove 13 is uniformly distributed circumferentially on disc body 11. Of course, it is not limited to this.

[0028] Specifically, each of the hollow grooves 13 is rotationally symmetrical about the center of the torque sink welding area 12. It can be understood that the rotationally symmetrical about the center of the torque sink welding area 12 of each of the hollow grooves 13 is only one of optional schemes of the arrangement of the hollow grooves 13, and is not limited thereto. The shapes of the hollow grooves 13 can be the same or different.

[0029] In a specific example, the number of the hollow grooves 13 is six, which are evenly distributed in the circumferential direction on the disc body 11. Of course, the number of the hollow grooves 13 is not specifically limited.

[0030] In some embodiments, the disc body 11 is punched downward to form a full-tab sink welding area 14, and the current collecting disc 1 is welded to the full tab of the winding core 2 through the full-tab sink welding area 14. The full-tab sink welding area 14 is formed in a region outside the hollow groove region of the disc body 11. The hollow groove region is a region in which the hollow grooves 13 are formed.

[0031] Specifically, the disc body 11 is formed with a plurality of full-tab sink welding areas 14 which are distributed in the circumferential direction.

[0032] In some embodiments, a plurality of liquid infiltration through holes 15 are formed on the disc body 11. Through the plurality of liquid infiltration through holes 15 formed on the disc body 11, liquid can be infiltrated through the liquid infiltration through holes 15 during liquid injection. The liquid infiltration through holes 15 are formed in a region outside the hollow groove region of the disc body 11.

[0033] Specifically, the plurality of liquid infiltration through holes 15 are evenly distributed in the circumferential direction on the disc body 11.

[0034] Specifically, the liquid infiltration through hole 15 is an oblong hole. Of course, it is not limited thereto.

[0035] In some embodiments, a plurality of full-tab sink welding areas 14 and a plurality of liquid infiltration through holes 15 are formed on the disc body 11, the plurality of full-tab sink welding areas 14 and the plurality of liquid infiltration through holes 15 are alternately arranged in the circumferential direction, and are located in a region outside the hollow groove region of the disc body 11.

[0036] Specifically, the material of the current collecting disc 1 can be copper material, aluminum material, etc.

[0037] Please refer to Figures 1 to 4 The utility model embodiment further discloses a power battery, which comprises the current collecting disc 1 for the power battery.

[0038] In the embodiment of the utility model, the disc body 11 of the current collecting disc 1 is circumferentially distributed with a plurality of hollow grooves 13 at the position close to the torque sink welding area 12, and the hollow grooves 13 can deform when the torque sink welding area 12 is impacted by torque. Further, during torque welding, the deformation of the hollow grooves 13 can offset (at least partially) the torque impact on the torque sink welding area 12, avoiding the edge material of the torque sink welding area 12 from being fatigued, and avoiding the problem of insufficient internal electrical connection strength of the power battery and the risk of open circuit due to the fatigue of the edge material of the torque sink welding area 12. At the same time, since the deformation of the hollow grooves 13 can offset the torque impact on the torque sink welding area 12, the welding friction during torque welding is reduced, and further, the metal chips caused by the torque welding area can be reduced, which is beneficial to improve the risk of fire and explosion of the power battery and improve the safety performance and shock resistance of the power battery.

[0039] Specifically, the power battery further comprises a winding core 2 and a shell 3 sleeved outside the winding core 2. Figure 4 In the example, the current collecting disc 1 is welded to the shell bottom 31 of the shell 3 through the torque sink welding area 12. Of course, it is not limited to this, for example, in other embodiments, the current collecting disc 1 can be welded through the torque sink welding area 12 and the pole.

[0040] In order to facilitate understanding of the utility model, the optional assembly process of the power battery in the example of the drawing is briefly described as follows:

[0041] Firstly, the full tab of the winding core 2 is subjected to a pretreatment operation such as rubbing / planning.

[0042] Then, the current collecting disc 1 is placed on the full tab of the winding core 2, and the full tab sink welding area 14 of the current collecting disc 1 is welded and fixed to the full tab of the winding core 2 by using laser welding.

[0043] Then, the winding core 2 with the welded current collecting disc 1 is placed into the shell 3, and the current collecting disc 1 faces the shell bottom 31.

[0044] Then, the torque welding head passes through the center hole 21 of the winding core 2, and the torque sink welding area 12 in the middle of the current collecting disc 1 is torque welded and fixed to the shell bottom 31.

[0045] The above disclosed is only a preferred example of the utility model, which is convenient for understanding and implementation by those skilled in the art, and of course cannot limit the scope of the utility model, so equivalent changes made according to the application scope of the utility model still belong to the scope covered by the utility model.

Claims

1. A current collector for a power cell, characterized by, The current collecting plate comprises a plate body, a middle part of the plate body is upwardly punched to form a torque sink welding area, and a plurality of hollow grooves are circumferentially distributed on the plate body near the torque sink welding area, and the hollow grooves are configured to be deformed when the torque sink welding area is subjected to torque impact. The shape of the hollow groove is approximately S-shaped, one end of which is close to the torque sink welding area, and the other end of which is away from the torque sink welding area.

2. The current collector plate for a power battery according to claim 1, characterized in that, Each of the hollow grooves is uniformly distributed circumferentially on the current collecting plate.

3. The current collector plate for a power cell of claim 2, wherein, Each of the hollow grooves is rotationally symmetrical about the center of the torque sink welding area.

4. The current collector plate for a power cell of claim 3, wherein, The number of the hollow grooves is six.

5. The current collector plate for a power cell of claim 1, wherein, The plate body is downwardly punched to form a full-tab sink welding area.

6. The current collector plate for a power cell of claim 5, wherein, A plurality of full-tab sink welding areas are circumferentially distributed on the plate body.

7. The current collector plate for a power cell of claim 1, wherein, A plurality of liquid permeation through holes are formed on the plate body.

8. The current collector plate for a power cell of claim 1, wherein, The plate body is provided with a plurality of full-tab sink welding areas and a plurality of liquid permeation through holes, and the plurality of full-tab sink welding areas and the plurality of liquid permeation through holes are alternately arranged circumferentially.

9. A power cell, characterized by A current collecting plate for a power battery as claimed in any one of claims 1 to 8 is provided.

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