Large cylindrical battery negative current collector and large cylindrical battery

Abstract

The utility model relates to a large cylindrical battery cathode current collector sheet and a large cylindrical battery, the large cylindrical battery cathode current collector sheet comprises a disc and lace antenna connecting sheets arranged on the periphery of the disc, the lace antenna connecting sheets and the disc are of an integrally formed structure, the lace antenna connecting sheets are of a V-shaped structure, the included angle of the V-shaped structure is 160-175 degrees, and the lace antenna connecting sheets are arranged on the periphery of the disc. The connecting positions of the lace antenna connecting pieces and the disc incline downwards relative to the lace antenna connecting pieces, and the number of the lace antenna connecting pieces is at least one. By arranging the lace antenna connecting piece, the contact internal resistance of the current collecting piece and the battery shell can be greatly reduced at the negative electrode end of the lace antenna connecting piece, the current conduction and passing rate is improved, especially when the battery is overloaded at a large current and the battery discharges at a large current in a high-temperature environment, the temperature rise in the battery can be effectively reduced, and the service life of the battery is prolonged. And the trouble of use safety of the battery is avoided.

Description

Technical Field

[0001] The utility model relates to a negative electrode current collector of a large cylindrical battery and a large cylindrical battery. Background Art

[0002] In recent years, as lithium-ion batteries are widely used in various fields, such as electric vehicles, power tools, base station energy storage, household energy storage, electronic digital 3C, etc., during the use of lithium-ion batteries, safety issues have also received more and more attention. During use, especially under conditions of high-load, high-current discharge and high-temperature environment, whether it is a single cell or a battery pack (pack), the internal temperature will rise during operation, causing the diaphragm to shrink and short-circuit, and the internal heat generation and pressure increase of the lithium battery will expand, and even explode to release some irritating gases, affecting human life and health safety.

[0003] like Figure 1 As shown, the large cylindrical lithium battery includes a battery cover 1, an electric coil core body 2, a negative electrode current collector 3 and a battery shell 4. Figure 2 and Figure 3 As shown, the negative electrode current collector 3 commonly used in large cylindrical lithium batteries at present has not changed much in basic morphology. The commonly used negative electrode current collector 3 (whose material is nickel-plated copper sheet or pure nickel sheet) is generally connected to the battery shell 4 (negative end) by resistance welding or ultrasonic welding, and the current collector is of a single form. Except for the actual connection at the welding part, other non-welding areas are indirectly in contact with the battery shell. When excessive current is transmitted (large current overload), a large amount of heat will be generated, causing a high temperature rise inside the battery, causing safety impact.

[0004] In order to solve the above problems, the present utility model is hereby proposed. Utility Model Content

[0005] The utility model aims to provide a negative electrode current collector for a large cylindrical battery.

[0006] The above purpose is achieved by the following technical solutions:

[0007] A negative electrode current collector for a large cylindrical battery comprises a disc and lace antennae connecting pieces arranged around the disc.

[0008] Furthermore, the lace antenna piece and the disc are an integrally formed structure.

[0009] Furthermore, the lace antenna piece is a V-shaped structure.

[0010] Preferably, the included angle of the V-shaped structure is 160-175 degrees.

[0011] Furthermore, the connection between the lace antenna piece and the disc is inclined downward relative to the lace antenna piece.

[0012] Preferably, the number of the lace antenna tabs is at least one.

[0013] Preferably, the number of the lace antenna tabs is 12.

[0014] Preferably, the number of the lace antenna tabs is ten.

[0015] Another object of the utility model is to provide a cylindrical battery.

[0016] The above purpose is achieved by the following technical solutions:

[0017] A large cylindrical battery comprises the above-mentioned large cylindrical battery negative electrode current collector, and also comprises a battery shell, a battery cover, a positive electrode current collector, a positive electrode insulating sheet, and a battery core body, wherein the negative electrode current collector is located at the bottom of the battery shell, the negative electrode current collector is welded to the battery shell, the battery core body is located in the battery shell and above the negative electrode current collector, the positive electrode insulating sheet is located above the battery core body, the positive electrode current collector is located above the positive electrode insulating sheet, and the battery cover covers the positive electrode current collector and is snapped with the battery shell.

[0018] Beneficial technical effects:

[0019] The utility model provides a lace antenna piece, which can greatly reduce the contact internal resistance between the current collector and the battery shell at the negative terminal, thereby improving the current transfer and passing rate. In particular, when the battery is overloaded with a large current or when the battery is discharged with a large current in a high temperature environment, it can effectively reduce the increase in the internal temperature of the battery and avoid the trouble of battery safety problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the cylindrical battery structure in the prior art.

[0022] Figure 2 It is a schematic diagram of the planar structure of the negative electrode current collector in the prior art.

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the negative electrode current collector in the prior art.

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the negative electrode current collector of a large cylindrical battery of the utility model.

[0025] Figure 5 It is a schematic diagram of the planar structure of the negative electrode current collector of a large cylindrical battery of the utility model.

[0026] Figure 6 It is another three-dimensional structural schematic diagram of the negative electrode current collector of the large cylindrical battery of the utility model.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the cylindrical battery of the utility model.

[0028] Figure 8 This is a cross-sectional view of a large cylindrical battery of the utility model.

[0029] Fig. 9 This is another three-dimensional structural schematic diagram of the large cylindrical battery of the utility model.

[0030] The numbers in the figure are: 1. battery cover; 2. battery core body; 3. negative electrode current collector; 4. battery shell; 5. battery cover; 6. positive electrode current collector; 7. positive electrode insulating sheet; 8. battery core body. DETAILED DESCRIPTION

[0031] Example 1

[0032] Reference Figure 4-6 As shown, a negative electrode current collector of a large cylindrical battery includes a disc 31 and lace antenna tabs 32 arranged around the disc 31. When in use, the negative electrode current collector of the large cylindrical battery is welded to the battery shell, and at the same time, the lace antenna tabs 32 are in close contact with the inner wall of the battery shell.

[0033] The number of the lace antenna pieces 32 is at least one. Preferably, the number of the lace antenna pieces 32 is twelve. In the present embodiment, the number of the lace antenna pieces 32 is ten.

[0034] The lace antenna piece 32 and the disc 31 are integrally formed. The lace antenna piece 32 is a V-shaped structure with an included angle of 160-175 degrees. The connection between the lace antenna piece 32 and the disc 31 is inclined downward relative to the lace antenna piece 32 .

[0035] When in use, the disc 31 of the negative electrode current collector of the large cylindrical battery is normally welded to the battery shell. At the same time, the lace antenna piece 32 also closely contacts the inner wall of the battery shell, thereby achieving the purpose of further increasing the contact area between the current collector and the battery shell.

[0036] This embodiment improves the current collector style by adding a new type of lace antenna tab on the basis of the traditional negative electrode current collector, so that on the basis of normal welding with the battery shell, the lace antenna tabs 32 can tightly contact the inner wall of the battery shell through 12 points.

[0037] The negative electrode current collector of large cylindrical batteries is made of nickel-plated copper sheet or pure nickel sheet.

[0038] The negative electrode current collector of the large cylindrical battery is connected to the battery shell 4 by resistance welding or ultrasonic welding, and the negative end of the battery shell 4 is welded. In addition to the actual connection at the welding position, the lace antenna piece 32 is in direct contact with the battery shell. The lace antenna piece 32 at the negative end can greatly reduce the contact internal resistance between the current collector and the battery shell, thereby improving the current conduction and pass rate. Especially when the battery is overloaded with a large current and when the battery is discharged with a large current in a high temperature environment, it can effectively reduce the increase in the internal temperature of the battery and avoid the trouble of battery safety issues.

[0039] Example 2

[0040] Reference Figure 7-Figure 9 The present embodiment discloses a large cylindrical battery, comprising the negative electrode current collector 3 described in Embodiment 1, and also comprising a battery shell 4, a battery cover 5, a positive electrode current collector 6, a positive electrode insulating sheet 7, and a battery core body 2, wherein the negative electrode current collector 3 is located at the bottom of the battery shell 4, the negative electrode current collector 3 is welded to the battery shell 4, the battery core body 2 is located in the battery shell 4 and above the negative electrode current collector 3, the positive electrode insulating sheet 7 is located above the battery core body 2, the positive electrode current collector 6 is located above the positive electrode insulating sheet 7, and the battery cover 5 covers the positive electrode current collector 6 and is snapped with the battery shell 4.

[0041] The cylindrical battery can improve the current conduction and passing rate by using the negative electrode current collecting sheet 3 with the lace antenna tab 32. In particular, when the cylindrical battery is overloaded with a large current, it can effectively reduce the increase in the internal temperature of the cylindrical battery and ensure the safety of the battery.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A negative electrode current collector for a large cylindrical battery, characterized in that: It comprises a disc (31) and lace antenna connecting pieces (32) arranged around the disc (31); the lace antenna connecting pieces (32) are of a V-shaped structure.

2. The negative electrode current collector of a large cylindrical battery according to claim 1, characterized in that: The lace antenna piece (32) and the disc (31) are an integrally formed structure.

3. The negative electrode current collector of a large cylindrical battery according to claim 1, characterized in that: The included angle of the V-shaped structure is 160-175 degrees.

4. The negative electrode current collector of a large cylindrical battery according to claim 3, characterized in that: The connection point between the lace antenna piece (32) and the disc (31) is inclined downward relative to the lace antenna piece (32).

5. The negative electrode current collector of a large cylindrical battery according to claim 4, characterized in that: The number of the lace antenna connecting piece (32) is at least one.

6. The negative electrode current collector of a large cylindrical battery according to claim 4, characterized in that: The number of the lace antennae connecting pieces (32) is 12.

7. The negative electrode current collector of a large cylindrical battery according to claim 4, characterized in that: The number of the lace antennae connecting pieces (32) is ten.

8. A large cylindrical battery, characterized in that: A large cylindrical battery comprising a negative electrode current collector according to any one of claims 1 to 7, and further comprising a battery casing (4), a battery cover (5), a positive electrode current collector (6), a positive electrode insulating sheet (7), and a battery core body (2), wherein the negative electrode current collector (3) is located at the bottom of the battery casing (4), the negative electrode current collector (3) is welded to the battery casing (4), the battery core body (2) is located inside the battery casing (4) and above the negative electrode current collector (3), the positive electrode insulating sheet (7) is located above the battery core body (2), the positive electrode current collector (6) is located above the positive electrode insulating sheet (7), and the battery cover (5) covers the positive electrode current collector (6) and is snapped with the battery casing (4).

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