Collector plate for power battery and power battery

Abstract

The invention discloses a collector plate for a power battery and the power battery. The collector plate comprises a plate body, the plate body extends towards one side to form an extension handle, the end, away from the plate body, of the extension handle is configured to be welded to the bottom face of the pole, a through hole and an upper protruding ring surrounding the through hole are formed in the plate body, a plane supporting ring is formed between the upper protruding ring and the through hole, and a plurality of interval grooves are formed in the circumference direction of the upper protruding ring and the plane supporting ring. The plurality of interval grooves divide the upper convex ring into a plurality of elastic abutting parts which are used for elastically abutting against the end part of the bent extension handle and a plurality of parts which are used for dividing the plane supporting ring into the plurality of parts which are respectively connected with the elastic abutting parts, and an expansion body is arranged on the bottom surface of the plane supporting ring; when immersed in the electrolyte, the expansion body expands and becomes thick to fill the gap below the expansion body and push the elastic abutting part upwards. According to the invention, the potential safety hazard of the power battery caused by serious heating of the position of the extension handle can be avoided, and the stability of the self-adaptive parallel auxiliary overcurrent loop can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and particularly to a current collector plate for a power battery and a power battery. Background Art

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

[0003] 1. The extension handle of the common current collector plate of cylindrical power batteries is relatively long, resulting in a relatively high internal resistance of the power battery. When the cylindrical power battery is charged and discharged at a high rate, the position of the extension handle generates serious heat, posing a safety hazard to the power battery.

[0004] 2. A bending space for the extension handle of the current collector plate needs to be reserved for cylindrical power batteries. To ensure the structural compactness inside the power battery, a lower convex ring is required on the plastic under the top cover to press the current collector plate to form a seal for the bending space. The extension handle cannot dissipate heat effectively, posing a safety hazard to the power battery.

[0005] 3. Considering the long-term vibration condition after installation, higher requirements are imposed on the structural compactness inside the power battery. A more compact adaptation structure needs to be explored for the bending position of the extension handle to ensure its better seismic resistance and stability. Summary of the Invention

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

[0007] To achieve the above purpose, the present invention provides a current collector plate for a power battery. The current collector plate includes a plate body, the plate body is configured to be welded to the full tab of the wound core, the plate body extends out an extension handle to one side, and the end of the extension handle away from the plate body is configured to be welded to the bottom surface of the pole column. A through hole and an upper convex ring surrounding the through hole are formed on the plate body. A planar support ring is formed between the upper convex ring and the through hole. A plurality of spaced grooves are formed along the circumferential direction of the upper convex ring and the planar support ring. The plurality of spaced grooves divide the upper convex ring into a plurality of elastic abutting portions for elastically abutting against the end of the bent extension handle, and divide the planar support ring into a plurality of parts respectively connected to each elastic abutting portion. An expansion body is provided on the bottom surface of the planar support ring, and the expansion body is configured to expand and thicken when immersed in the electrolyte to fill the gap below it and push the elastic abutting portion upward.

[0008] Optionally, the expansion body is an expansion tape.

[0009] Optionally, the expansion body is fixedly disposed on the bottom surface of the planar support ring.

[0010] Optionally, the expansion body is disposed around the planar support ring for at least one turn.

[0011] Optionally, the upward convex ring is formed by the upward arching of the disk body.

[0012] Optionally, the cross-section of the upward convex ring along its circumferential direction is in an inverted V shape or an inverted U shape.

[0013] Optionally, the outer edge of the planar support ring is connected to the inner edge of the upward convex ring, and the inner edge of the planar support ring defines the boundary of the through hole.

[0014] Optionally, the through hole is substantially circular, and the upward convex ring and the planar support ring are substantially circular rings.

[0015] To achieve the above object, the present invention provides a power battery, including the current collecting disk for the power battery as described above.

[0016] Optionally, the power battery further includes a housing, a wound core, and a top cover assembly. The housing is sleeved outside the wound core. The disk body of the current collecting disk is welded to the full pole ear at the top end of the wound core. The top cover assembly includes a top cover and a pole post passing through the top cover. The top cover covers the top opening end of the housing. The bottom surface of the pole post is welded to the end portion of the extension handle. Each elastic abutting portion elastically abuts against the end portion of the bent extension handle and is opposite to the bottom surface of the pole post. When the expansion body is immersed in the electrolyte, it expands and thickens to fill the gap below it and push the elastic abutting portion upward.

[0017] In the embodiment of the present invention, a plurality of upward convex elastic abutting portions are formed on the disk body of the current collecting disk. The elastic abutting portions can adaptively elastically abut against the end portions of the bent extension handle. Then, when the power battery is charged and discharged, in addition to the current being transmitted through the extension handle, it can also be transmitted through the elastic abutting portions. That is, the extension handle and the elastic abutting portions can achieve parallel overcurrent. Moreover, by means of the adaptive elastic abutting method, reliable abutting is facilitated. Since the elastic abutting portions can assist the extension handle in overcurrent, when the power battery is charged and discharged at a high rate, the magnitude of the current passing through the extension handle can be reduced, which is beneficial to avoiding the safety hazard brought to the power battery by serious heating at the position of the extension handle. In addition, in the embodiment of the present invention, an expansion body is provided on the bottom surface of the planar support ring. The expansion body is configured to expand and thicken when immersed in the electrolyte to fill the gap below it and push the elastic abutting portion upward, so that the elastic abutting portion can more stably abut against the end portion of the bent extension handle, which is beneficial to forming a stable adaptive parallel auxiliary overcurrent circuit. Description of the Drawings

[0018] Figure 1 It is a three - dimensional structural schematic diagram of the current collector plate (without an expansion body) in an embodiment of the present invention.

[0019] Figure 2 is Figure 1 an enlarged view of part A in

[0020] Figure 3 It is a three - dimensional structural schematic diagram of the current collector plate (with an expansion body) after being bent in an embodiment of the present invention.

[0021] Figure 4 It is a sectional structural schematic diagram of the power battery in an embodiment of the present invention.

[0022] Figure 5 is Figure 4 an enlarged view of part B in Detailed implementation manners

[0023] In order to elaborate in detail the technical content, structural features, and achieved effects of the present invention, the following will be described in detail in conjunction with the implementation manners and with reference to the accompanying drawings.

[0024] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the following will give a detailed description of the specific implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0025] Please refer to Figures 1 to 5 , an embodiment of the present invention discloses a current collector plate 1 for a power battery. The current collector plate 1 includes a plate body 10, the plate body 10 is configured to be welded to the full - pole ear of the winding core 3, and the plate body 10 extends an extension handle 20 to one side. The end 21 of the extension handle 20 away from the plate body 10 is configured to be welded to the bottom surface of the pole column 4.

[0026] A through - hole 12 and an upper convex ring 11 surrounding the through - hole 12 (that is, the upper convex ring 11 is formed by protruding upward from the corresponding position of the plate body 10 relative to the plate body 10) are formed on the plate body 10. A planar support ring 15 is formed between the upper convex ring 11 and the through - hole 12. A plurality of spaced grooves 13 are formed along the circumferential direction of the upper convex ring 11 and the planar support ring 15. The plurality of spaced grooves 13 divide the upper convex ring 11 into a plurality of elastic abutting portions 14 for elastically abutting against the end 21 of the bent extension handle 20 and divide the planar support ring 15 into a plurality of parts 151 respectively connected to the respective elastic abutting portions 14.

[0027] The bottom surface of the planar support ring 15 is provided with an expansion body 17, and the expansion body 17 is configured to expand and thicken when immersed in the electrolyte to fill the gap below it (the gap between it and the winding core 3) and push the elastic abutting portion 14 upward. It can be understood that since the expansion body 17 is provided on the bottom surface of the planar support ring 15, when the expansion body 17 expands and thickens, it will directly push the planar support ring 15 upward. Since the respective elastic abutting portions 14 of the upper convex ring 11 are respectively connected to the respective portions 151 of the planar support ring 15, the respective portions 151 of the planar support ring 15 will respectively drive the respective elastic abutting portions 14 of the upper convex ring 11.

[0028] In the embodiment of the present invention, a plurality of elastic abutting portions 14 protruding upward are formed on the disk body 10 of the current collector disk 1. The elastic abutting portions 14 can adaptively and elastically abut against the end portion 21 (the position corresponding to the bottom surface of the pole column 4) of the bent extension handle 20. Then, when the power battery is charged and discharged, in addition to the current being transmitted through the extension handle 20, it can also be transmitted through the elastic abutting portions 14. That is, the extension handle 20 and the elastic abutting portions 14 can achieve parallel overcurrent, and by means of adaptive elastic abutting, it is beneficial to perform reliable abutting. Since the elastic abutting portions 14 can assist the extension handle 20 in overcurrent, when the power battery is charged and discharged at a high rate, the magnitude of the current passing through the extension handle 20 can be reduced, which is beneficial to avoiding the safety hazard brought to the power battery by serious heating at the position of the extension handle 20. In addition, in the embodiment of the present invention, an expansion body 17 is provided on the bottom surface of the planar support ring 15. The expansion body 17 is configured to expand and thicken when immersed in the electrolyte to fill the gap below it and push the elastic abutting portion 14 upward, so that the elastic abutting portion 14 can more stably abut against the end portion 21 of the bent extension handle 20, which is beneficial to forming a stable adaptive parallel auxiliary overcurrent circuit.

[0029] In addition, when the power battery with the above-mentioned current collector disk 1 has strong impacts on the winding core 3 and the current collector disk 1 due to vehicle loading vibration, the elastic abutting portion 14 elastically abuts against the end portion 21 of the extension handle 20 to offset the impact stress, so as to improve the internal structure compactness of the power battery and improve the seismic performance of the power battery.

[0030] In some embodiments, the expansion body 17 is an expansion tape and can be arranged on the bottom surface of the planar support ring 15 by means of adhesion. Of course, the expansion body 17 is not limited to the expansion tape, as long as it can play the role of expanding and thickening when immersed in the electrolyte to fill the gap below it and pushing the elastic abutting portion 14 upward. In addition, the number of the expansion bodies 17 is not limited to one. Exemplarily, an expansion body 17 can be arranged on each portion 151 of the planar support ring 15.

[0031] In some embodiments, the expansion body 17 is fixedly attached to the bottom surface of the planar support ring 15. Of course, it is not limited thereto.

[0032] In some embodiments, the expansion body 17 is disposed along the planar support ring 15 for at least one turn. Of course, it is not limited thereto.

[0033] In a specific example, an expansion tape is adhered along the planar support ring 15 for one turn.

[0034] In some embodiments, the upper convex ring 11 is formed by arching upward from the disk body 10.

[0035] It should be noted that the "arching" in the present invention does not only refer to the arching in the narrow sense, but should be understood in a broad sense, and can form the upper convex ring 11 with a cross-section that is not an arch in the narrow sense in a manner similar to arching. For example, the cross-section of the upper convex ring 11 along its circumferential direction can be in an inverted V shape or an inverted U shape, etc. In addition, the inverted V shape and the inverted U shape should also be understood in a broad sense and are not limited to the standard inverted V shape or inverted U shape.

[0036] Specifically, the outer edge of the planar support ring 15 is connected to the inner edge of the upper convex ring 11, and the inner edge of the planar support ring 15 defines the boundary of the through hole 12. The "inner edge" here can be defined as the edge close to the through hole 12, and the "outer edge" can be defined as the edge far from the through hole 12.

[0037] Specifically, the through hole 12 is circular, and the upper convex ring 11 is circular. Of course, it is not limited thereto.

[0038] In some embodiments, at least two sunken welding areas 16 are formed on the disk body 10, and the sunken welding areas 16 are used for welding with the full tab of the winding core 3.

[0039] In some embodiments, the material of the current collector disk 1 is aluminum or nickel-plated copper. Of course, it is not limited thereto.

[0040] Please refer to Figures 1 to 5 , an embodiment of the present invention discloses a power battery, including the current collector disk 1 for the power battery as described above.

[0041] Specifically, the power battery further includes a housing 7, a winding core 3, and a top cover assembly. The housing 7 is sleeved outside the winding core 3. The disk body 10 of the current collector disk 1 is welded to the full tab at the top end of the winding core 3. The top cover assembly includes a top cover 6 and a pole post 4 passing through the top cover 6. The top cover 6 covers the top opening end of the housing 7. The bottom surface of the pole post 4 is welded to the end 21 of the extension handle 20. Each elastic abutting portion 14 elastically abuts against the end 21 of the bent extension handle 20 and is opposite to the bottom surface of the pole post 4. When the expansion body 17 is immersed in the electrolyte, it expands and thickens to fill the gap below it and push the elastic abutting portion 14 upward.

[0042] Specifically, the power battery is a cylindrical power battery, and the winding core 3 is cylindrical.

[0043] In the embodiment of the present invention, a plurality of elastic abutting portions 14 protruding upward are formed on the disk body 10 of the current collector disk 1. The elastic abutting portions 14 are adaptively elastically abutted against the end portion 21 of the bent extension handle 20. Thus, when the power battery is charged and discharged, in addition to being transmitted through the extension handle 20, the current can also be transmitted through the elastic abutting portions 14. That is, the extension handle 20 and the elastic abutting portions 14 can achieve parallel overcurrent, and by means of adaptive elastic abutment, reliable abutment is facilitated. Since the elastic abutting portions 14 can assist the extension handle 20 in overcurrent, when the power battery is charged and discharged at a high rate, the magnitude of the current passing through the extension handle 20 can be reduced, which is beneficial to avoiding the safety hazard brought to the power battery by serious heating at the position of the extension handle 20. In addition, in the embodiment of the present invention, an expansion body 17 is provided on the bottom surface of the planar support ring 15. The expansion body 17 is configured to expand and thicken when immersed in the electrolyte to fill the gap below it and push the elastic abutting portion 14 upward, so that the elastic abutting portion 14 can more stably abut against the end portion 21 of the bent extension handle 20, which is beneficial to forming a stable adaptive parallel auxiliary overcurrent circuit.

[0044] In addition, when the power battery with the above-mentioned current collector disk 1 is installed and vibrated, causing a strong impact on the winding core 3 and the current collector disk 1, the elastic abutting portion 14 elastically abuts against the end portion 21 of the extension handle 20 to offset the impact stress, so as to improve the internal structural compactness of the power battery and improve the seismic performance of the power battery.

[0045] To facilitate the understanding of the present invention, the following briefly describes the optional assembly process of the power battery in the attached drawing examples:

[0046] First, a current collector disk 1 with structures such as an extension handle 20, an upward convex ring 11, a planar support ring 15, and a spacer groove 13 is manufactured. Among them, the upward convex ring 11 is divided into a plurality of elastic abutting portions 14 by a plurality of spacer grooves 13, and the size of the upward convex ring 11 and the number of spacer grooves 13 are preset.

[0047] Then, the sinking welding area 16 of the current collector disk 1 is welded to the full pole ear of the winding core 3.

[0048] Next, the winding core 3 is placed into the housing 7, and the end portion 21 of the extension handle 20 of the current collector disk 1 is welded and fixed to the bottom surface of the pole column 4.

[0049] Next, the top cover assembly is flipped, and the extension handle 20 is bent simultaneously, so that the top cover 6 covers the top opening end of the housing 7, and the end portion 21 of the extension handle 20 abuts against each elastic abutting portion 14. Since each elastic abutting portion 14 can elastically deform, it can achieve adaptive elastic abutment with the end portion 21 of the extension handle 20, which is beneficial to the reliability of the contact.

[0050] After liquid injection, the expansion tape adhered to the bottom surface of the planar support ring 15 thickens, automatically filling the gap below and pushing the elastic abutting portion 14 upward, so that each elastic abutting portion 14 can more stably abut against the end 21 of the extension handle 20, forming a stable self-adaptive parallel auxiliary overcurrent circuit.

[0051] The above-disclosed are only the preferred examples of the present invention, which are used to facilitate the understanding and implementation by those skilled in the art. Of course, the scope of the rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A current collector for a power battery, comprising a disc body, the disc body being configured to be welded to the full pole lug of a winding core, the disc body extending an extension handle to one side, the end of the extension handle away from the disc body being configured to be welded to the bottom surface of the pole, characterized in that: A through hole and an upper convex ring surrounding the through hole are formed on the disk body, a planar support ring is formed between the upper convex ring and the through hole, and a plurality of spacing grooves are formed along the circumference direction of the upper convex ring and the planar support ring. The plurality of spacing grooves divide the upper convex ring into a plurality of elastic abutment portions for elastically abutting the end of the bent extension handle and divide the planar support ring into a plurality of portions respectively connected to the elastic abutment portions. An expansion body is provided on the bottom surface of the planar support ring, and the expansion body is configured to expand and thicken when immersed in electrolyte to fill the gap below it and push the elastic abutment portion upward.

2. The current collecting plate for a power battery according to claim 1, characterized in that: The expansion body is an expansion tape.

3. The current collecting plate for a power battery according to claim 1, characterized in that: The expansion body is attached and fixed to the bottom surface of the planar support ring.

4. The current collecting plate for a power battery according to claim 1, characterized in that: The expansion body is arranged along the planar support ring for at least one circle.

5. The current collecting plate for a power battery according to claim 1, characterized in that: The upper convex ring is formed by the disk body arching upward.

6. The current collecting plate for a power battery according to claim 5, characterized in that: The cross section of the upper convex ring along its circumference direction is in an inverted V shape or an inverted U shape.

7. The current collecting plate for a power battery according to any one of claims 1 to 6, characterized in that: The outer edge of the planar support ring is connected to the inner edge of the upper convex ring, and the inner edge of the planar support ring defines the boundary of the through hole.

8. The current collecting plate for a power battery according to claim 1, characterized in that: The through hole is substantially circular, and the upper convex ring and the planar support ring are substantially annular.

9. A power battery, characterized in that: It comprises a current collecting plate for a power battery as claimed in any one of claims 1 to 8.

10. The power battery according to claim 9, characterized in that: The power battery also includes a shell, a winding core and a top cover assembly, the shell is sleeved on the outside of the winding core, the disc body of the current collecting disc is welded to the full pole ear at the top of the winding core, the top cover assembly includes a top cover and a pole penetrating the top cover, the top cover covers the top open end of the shell, the bottom surface of the pole and the end of the extension handle are welded, each of the elastic abutment portions elastically abuts against the end of the extension handle after bending and is opposite to the bottom surface of the pole, and the expansion body expands and thickens when immersed in the electrolyte to fill the gap below it and push the elastic abutment portion upward.

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