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 plate body is configured to be welded with a full tab of the roll core, the plate body extends towards one side to form an extension handle, the end part, far away from the plate body, of the extension handle is configured to be welded with the bottom surface of the pole, an upper convex part is formed on the plate body, and the upper convex part is configured to abut against the end part of the bent extension handle. When the power battery is charged and discharged, current can be transmitted through the extension handle and also can be transmitted through the upper convex part, that is, parallel overcurrent can be realized by the extension handle and the upper convex part. The upper convex part can assist the extension handle in overcurrent, so that when the power battery is subjected to high-rate charging and discharging, the magnitude of current passing through the extension handle can be reduced, and potential safety hazards caused by serious heating of the extension handle to the power battery can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a current collector for a power battery and a power battery. Background Technology

[0002] Currently, lithium-ion / sodium-ion cylindrical power batteries are gradually becoming the mainstream product in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charge and discharge. More and more manufacturers are continuously pursuing the optimization of cylindrical power battery structure compactness to improve energy density. However, the following common problems currently exist:

[0003] 1. The extension shank of the current collector in cylindrical power batteries is often quite long, which leads to a higher internal resistance of the power battery. When the power battery is charged and discharged at high rates, the extension shank area gets very hot, posing a safety hazard to the power battery.

[0004] 2. Cylindrical power batteries need to reserve bending space for the extension handle of the current collector. In order to ensure the compactness of the internal structure of the power battery, there needs to be a convex ring under the top cover to press down the current collector and seal the bending space. The extension handle cannot effectively dissipate heat, which poses a safety hazard to the power battery.

[0005] 3. Considering the long-term vibration conditions after installation in the vehicle, higher requirements are placed on the compactness of the internal structure of the power battery. A more compact adaptation structure needs to be explored at the extension handle bending position to ensure its better shock resistance and stability. Utility Model Content

[0006] The purpose of this utility model is to provide a current collector for a power battery and a power battery, which can solve at least one of the technical problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides a current collector for a power battery, the current collector including a disk body, the disk body being configured to be welded to the full tabs of a winding core, the disk body extending to one side to form an extension shank, the end of the extension shank away from the disk body being configured to be welded to the bottom surface of an electrode post, characterized in that: an upper protrusion is formed on the disk body, the upper protrusion being configured to abut against the end of the bent extension shank.

[0008] Optionally, a through hole is formed on the disc body, the upper protrusion is annular and arranged around the through hole, the upper protrusion is close to or connected to the through hole; a plurality of spaced grooves are formed along the circumferential direction of the upper protrusion, the plurality of spaced grooves divide the upper protrusion into a plurality of elastic abutment portions for abutting against the extension handle, and the spaced grooves are formed at least on the upper protrusion.

[0009] Optionally, the upper convex portion is formed by the upward arching of the disc body.

[0010] Optionally, the cross-section of the upper convex portion along its circumferential direction is inverted V-shaped or inverted U-shaped.

[0011] Optionally, a planar support ring is provided between the upper protrusion and the through hole, the outer edge of the planar support ring is connected to the outer edge of the upper protrusion, the inner edge of the planar support ring defines the boundary of the through hole, and the spacer groove is formed in the planar support ring to divide the planar support ring into multiple parts that are respectively connected to each of the elastic abutment portions.

[0012] Optionally, the through hole is circular, and the upper protrusion is annular.

[0013] Optionally, at least two recessed soldering areas are formed on the disc body, the recessed soldering areas being used for soldering with the full-pole tabs of the winding core.

[0014] Optionally, the collector plate is made of aluminum or nickel-plated copper.

[0015] To achieve the above objectives, this utility model provides a power battery, including the current collector for the power battery as described above.

[0016] Optionally, the power battery further includes a housing, a winding core, and a top cover assembly. The housing is sleeved on the outside of the winding core. The current collector is welded to the full tab at the top of the winding core. The top cover assembly includes a top cover and a terminal post passing through the top cover. The top cover covers the top opening of the housing. The bottom surface of the terminal post and the end of the extension shank are welded together. The upper protrusion abuts against the end of the bent extension shank and is opposite to the bottom surface of the terminal post.

[0017] In this embodiment of the invention, an upper protrusion is formed on the current collector plate. The upper protrusion is configured to abut against the end of the bent extension handle. Therefore, during charging and discharging of the power battery, current can be transmitted not only through the extension handle but also through the upper protrusion, meaning the extension handle and the upper protrusion can achieve parallel current flow. Since the upper protrusion assists the extension handle in current flow, the current flowing through the extension handle can be reduced during high-rate charging and discharging of the power battery, which helps avoid the safety hazards caused by severe overheating at the extension handle location. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the collector disk in an embodiment of this utility model.

[0019] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0020] Figure 3This is a cross-sectional structural diagram of the power battery according to an embodiment of the present invention, in which the casing and other components are hidden.

[0021] Figure 4 yes Figure 3 Enlarged view of section B in the middle. Detailed Implementation

[0022] To explain in detail the technical content, structural features, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0023] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0024] Please see Figures 1 to 4 This utility model discloses a current collector 1 for a power battery. The current collector 1 includes a disk body 10, which is configured to be welded to the full tabs of the core 3. An extension shank 20 extends from one side of the disk body 10. The end 21 of the extension shank 20 away from the disk body 10 is configured to be welded to the bottom surface of the terminal post 4. An upper protrusion 11 is formed on the disk body 10, which is configured to abut against the end 21 of the bent extension shank 20.

[0025] In this embodiment of the invention, an upper protrusion 11 is formed on the disk body 10 of the current collector 1. The upper protrusion 11 is configured to abut against the end 21 of the bent extension handle 20. Thus, when the power battery is charging and discharging, the current can be transmitted not only through the extension handle 20 but also through the upper protrusion 11, meaning that the extension handle 20 and the upper protrusion 11 can achieve parallel current flow. Since the upper protrusion 11 can assist the extension handle 20 in current flow, the current through the extension handle 20 can be reduced when the power battery is charged and discharged at a high rate, which helps to avoid the safety hazards to the power battery caused by severe overheating at the extension handle 20.

[0026] In some embodiments, a through hole 12 is formed on the disk body 10, and an upper protrusion 11 is annular and disposed around the through hole 12. The upper protrusion 11 is close to or connected to the through hole 12 (i.e., its inner edge is the boundary of the through hole 12). A plurality of spacer grooves 13 are formed along the circumferential direction of the upper protrusion 11, and the plurality of spacer grooves 13 divide the upper protrusion 11 into a plurality of elastic abutment portions 14 for abutting against the extension handle 20. The spacer grooves 13 are formed at least on the upper protrusion 11. Since the upper protrusion 11 is divided into a plurality of elastic abutment portions 14, the plurality of elastic abutment portions 14 can achieve adaptive elastic abutment against the end 21 of the extension handle 20, which can ensure contact reliability and thus enable reliable parallel overcurrent.

[0027] Specifically, the upper convex part 11 is formed by the upward arching of the disc body 10.

[0028] It should be noted that the term "arch" in this utility model does not refer to arch in the narrow sense, but should be interpreted broadly. It can refer to an upper convex part 11 with a non-arched cross section formed in a similar arched manner. For example, the cross section of the upper convex part 11 along its circumference direction can be inverted V-shape or inverted U-shape. In addition, the inverted V-shape and inverted U-shape should also be interpreted broadly and are not limited to the standard inverted V-shape or inverted U-shape.

[0029] Specifically, a planar support ring 15 is provided between the upper protrusion 11 and the through hole 12. The outer edge of the planar support ring 15 is connected to the outer edge of the upper protrusion 11. The inner edge of the planar support ring 15 defines the boundary of the through hole 12. A spacer groove 13 is partially formed on the planar support ring 15 to divide the planar support ring 15 into multiple parts that are respectively connected to each elastic abutment part 14.

[0030] Specifically, the through hole 12 is circular, and the upper protrusion 11 is annular. Of course, this is not a limitation.

[0031] In some embodiments, at least two recessed solder areas 16 are formed on the disc body 10, and the recessed solder areas 16 are used for welding with the full-pole tabs of the core 3.

[0032] In some embodiments, the collector plate 1 is made of aluminum or nickel-plated copper. Of course, it is not limited to this.

[0033] Please see Figures 1 to 4 This utility model embodiment discloses a power battery, including the current collector 1 for the power battery as described above.

[0034] Specifically, the power battery also includes a casing (not shown), a winding core 3, and a top cover assembly. The casing is fitted over the outside of the winding core 3. The disc body 10 of the current collector 1 is welded to the full tab at the top of the winding core 3. The top cover assembly includes a top cover 6 and a terminal post 4 passing through the top cover 6. The top cover 6 covers the top opening of the casing. The bottom surface of the terminal post 4 and the end 21 of the extension shank 20 are welded together. The upper protrusion 11 abuts against the end 21 of the bent extension shank 20 and is opposite to the bottom surface of the terminal post 4.

[0035] In this embodiment of the invention, an upper protrusion 11 is formed on the disk body 10 of the current collector 1. The upper protrusion 11 abuts against the end 21 of the bent extension shank 20 and is opposite to the bottom surface of the terminal post 4. Thus, when the power battery is charging and discharging, the current can be transmitted not only through the extension shank 20 but also through the upper protrusion 11, that is, the extension shank 20 and the upper protrusion 11 can achieve parallel current transmission. Since the upper protrusion 11 can assist the extension shank 20 in current transmission, the current through the extension shank 20 can be reduced when the power battery is charged and discharged at a high rate, which helps to avoid the safety hazards to the power battery caused by severe overheating at the extension shank 20.

[0036] To facilitate understanding of this utility model, the optional assembly process of the power battery in the accompanying drawings is briefly described below:

[0037] First, a collector plate 1 with an upper protrusion 11 and an extension handle 20 is manufactured, wherein the upper protrusion 11 is divided into multiple elastic abutment portions 14 by multiple spacer grooves 13.

[0038] Then, the sunken welding area 16 of the collector plate 1 is welded to the full-pole tab of the core 3.

[0039] Next, the core 3 is placed into the housing, and the end 21 of the extension handle 20 of the collector plate 1 is welded and fixed to the bottom surface of the pole post 4.

[0040] Next, the top cover assembly is flipped over, and the extension handle 20 is simultaneously bent so that the top cover 6 closes onto the top opening of the housing, and the end 21 of the extension handle 20 abuts against each of the elastic abutment portions 14. Since each elastic abutment portion 14 can elastically deform, it can achieve adaptive elastic abutment with the end 21 of the extension handle 20, ensuring reliable contact.

[0041] The above-disclosed examples are merely preferred embodiments of the present utility model, intended to facilitate understanding and implementation by those skilled in the art. They should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model are still within the scope of the present utility model.

Claims

1. A current collector for a power battery, the current collector comprising a disc body, the disc body being configured to be welded with full tabs of a roll core, the disc body extending an extension handle to one side, an end of the extension handle away from the disc body being configured to be welded with a bottom surface of a pole, characterized in that: An upper convex part is formed on the disc body and configured to abut against the end of the bent extension handle.

2. The current collector plate for a power battery according to claim 1, characterized in that, A through hole is formed on the disc body, the upper convex part is annular and arranged around the through hole, and the upper convex part is close to or connected with the through hole; a plurality of interval grooves are formed along the circumference of the upper convex part, and the interval grooves divide the upper convex part into a plurality of elastic abutting parts for abutting against the extension handle.

3. The current collector plate for a power cell of claim 2, wherein, The upper convex part is formed by arching upward from the disc body.

4. The current collector plate for a power cell of claim 3, wherein, The cross section of the upper convex part along the circumference thereof is inverted V-shaped or inverted U-shaped.

5. The current collector for a power cell according to claim 3 or 4, characterized in that A planar support ring is arranged between the upper convex part and the through hole, the outer edge of the planar support ring is connected with the outer edge of the upper convex part, the inner edge of the planar support ring defines the boundary of the through hole, and the interval grooves are partially formed on the planar support ring to divide the planar support ring into a plurality of parts connected with the elastic abutting parts respectively.

6. The current collector plate for a power cell according to any one of claims 2 to 4, characterized in that The through hole is circular, and the upper convex part is annular.

7. The current collector plate for a power cell of claim 1, wherein, At least two sunken welding areas are formed on the disc body, and the sunken welding areas are used for welding with the full tab of the winding core.

8. The current collector plate for a power cell of claim 1, wherein, The material of the current collecting disc is aluminum or copper plated with nickel.

9. A power cell, characterized by The application relates to a current collecting disc for a power battery.

10. The power cell of claim 9, wherein, The power battery further comprises a shell, a winding core and a top cover assembly, the shell is sleeved outside the winding core, the disc body of the current collecting disc is welded with the full tab at the top end of the winding core, the top cover assembly comprises a top cover and a pole column penetrating through the top cover, the top cover covers the top opening end of the shell, the bottom surface of the pole column is welded with the end of the extension handle, and the upper convex part abuts against the end of the bent extension handle and is opposite to the bottom surface of the pole column.

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