Cylindrical lithium battery positive and negative electrode connecting device with built-in BMS (Battery Management System) board

Abstract

The utility model discloses a cylindrical lithium battery positive and negative electrode connecting device with a built-in BMS (Battery Management System) board, which comprises a negative electrode steel shell and a battery roll core arranged in the negative electrode steel shell, and also comprises a positive electrode connecting assembly, the positive electrode connecting assembly comprises a positive electrode aluminum cover and a positive electrode hardware column in contact with one surface of the positive electrode aluminum cover, one surface, deviating from the positive electrode hardware column, of the positive electrode aluminum cover is in contact with the positive electrode end of the battery roll core; elastic sheets are arranged at the edge of the inner ring of the negative electrode hardware ring at intervals, the elastic sheets are clamped with the inner ring at the opening end of the negative electrode steel shell, and one end, far away from the opening, of the negative electrode steel shell is in contact with the negative electrode of the battery roll core; the BMS mainboard is arranged on the positive electrode aluminum cover, and the negative electrode hardware ring is arranged on the BMS mainboard. By means of the design, clamping connection can be achieved through the positive electrode connecting assembly and the negative electrode hardware ring, so that a traditional welding mode is avoided, and meanwhile the working state of the round lithium battery can be monitored through the built-in BMS mainboard.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a positive and negative electrode connecting device of a cylindrical lithium battery with a built-in BMS board. Background Art

[0002] The positive and negative connection devices of lithium batteries generally include connection screws, conductor connectors, nickel sheets and other components. Lithium batteries with BMS boards refer to lithium batteries with BMS board battery management systems added inside or outside the battery, which can improve the safety, stability and service life of lithium batteries and better meet the energy needs of electronic equipment and power tools;

[0003] But the problem now is that the positive and negative poles of traditional cylindrical lithium batteries are usually connected by welding, and there is no BMS board, which makes it impossible to monitor and control the use status of the lithium battery, resulting in low safety and stability of the battery. Utility Model Content

[0004] In order to solve the technical defects raised in the above-mentioned background technology, the purpose of the utility model is to provide a positive and negative electrode connection device of a cylindrical lithium battery with a built-in BMS board, which can be clamped by the positive electrode connection component and the negative electrode hardware ring, thereby avoiding the traditional welding method. At the same time, the built-in BMS mainboard can monitor the working status of the circular lithium battery.

[0005] The utility model adopts the following technical solutions:

[0006] A positive and negative electrode connection device for a cylindrical lithium battery with a built-in BMS board, comprising a negative electrode steel shell, a battery coil core placed in the negative electrode steel shell, and a capping mechanism covering the negative electrode steel shell and contacting the battery coil core, wherein the capping mechanism comprises:

[0007] A positive electrode connection assembly, the positive electrode connection assembly comprising a positive electrode aluminum cover and a positive electrode hardware column in contact with one side of the positive electrode aluminum cover, and a side of the positive electrode aluminum cover facing away from the positive electrode hardware column in contact with the positive end of the battery roll core;

[0008] A negative electrode hardware ring, wherein the inner edge of the negative electrode hardware ring is provided with spring pieces at intervals, the spring pieces are clamped with the inner circle of the opening end of the negative electrode steel shell, and one end of the negative electrode steel shell away from the opening is in contact with the negative electrode of the battery coil core;

[0009] BMS mainboard, the BMS mainboard is arranged on the positive electrode aluminum cover, and the negative electrode hardware ring is arranged on the BMS mainboard; wherein, the BMS mainboard is used to monitor the status of the cylindrical lithium battery.

[0010] Optionally, the BMS mainboard is also covered with a plastic cover for isolating the positive electrode hardware column from the negative electrode hardware ring, and the positive electrode hardware column is penetrated through the plastic cover.

[0011] Optionally, the positive electrode hardware column is sequentially passed through the plastic cover and the BMS mainboard and contacts the side of the positive electrode aluminum cover facing away from the battery roll core.

[0012] Optionally, a concave cavity and an explosion-proof bracket are arranged in the concave cavity on a side of the positive electrode aluminum cover facing the BMS mainboard, and the BMS mainboard is embedded in the explosion-proof bracket.

[0013] Optionally, it also includes a plastic bracket that is clamped to one end of the negative electrode steel shell near the opening, and the positive electrode aluminum cover, negative electrode hardware ring, BMS mainboard, and explosion-proof bracket are all arranged in the plastic bracket.

[0014] Optionally, a management chip and LED indicator light are provided on the BMS main board for monitoring and controlling the cylindrical lithium battery.

[0015] In summary, the beneficial effects of the utility model are:

[0016] By setting the positive aluminum cover in contact with the positive end of the battery roll core and contacting the other side of the positive aluminum cover through the positive hardware column, the positive electrode of the cylindrical lithium battery can be converted and connected. At the same time, by setting the negative hardware ring on the BMS mainboard and clamping it with the negative steel shell, the negative electrode of the cylindrical lithium battery can be connected. By assembling and clamping the positive connection component and the negative hardware ring, the traditional welding method is avoided. At the same time, by setting the BMS mainboard on the positive aluminum cover, the status of the cylindrical lithium battery can be monitored, thereby improving the safety and stability of the lithium battery.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded view of an embodiment of the utility model;

[0019] Figure 2 This is an exploded view of the capping mechanism of an embodiment of the utility model;

[0020] Figure 3 It is a cross-sectional view of an embodiment of the utility model.

[0021] Description of reference numerals in the figures:

[0022] 1. Negative electrode steel shell; 2. Battery coil core; 3. Positive electrode connection assembly; 31. Positive electrode aluminum cover; 311. Concave cavity; 32. Positive electrode hardware column; 4. Negative electrode hardware ring; 41. Shrapnel; 5. BMS motherboard; 51. Management chip; 52. LED indicator light; 6. Plastic cover; 7. Explosion-proof bracket; 8. Plastic bracket. DETAILED DESCRIPTION

[0023] In order to make the content of the utility model more clearly understood, the utility model is further described below based on specific embodiments in combination with the accompanying drawings.

[0024] It should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like used herein to indicate directions or positional relationships are based on directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Unless otherwise specified, "plurality" means two or more.

[0025] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood by specific circumstances.

[0026] like Figures 1 to 3 As shown, the embodiment of the present application provides a positive and negative electrode connection device of a cylindrical lithium battery with a built-in BMS board, comprising a negative electrode steel shell 1, a battery roll core 2 placed in the negative electrode steel shell 1, and a capping mechanism covered on the negative electrode steel shell 1 and in contact with the battery roll core 2, the capping mechanism comprising a positive electrode connection component 3, a negative electrode hardware ring 4 and a BMS main board 5, the positive electrode connection component 3 comprising a positive electrode aluminum cover 31 and a positive electrode hardware column 32 in contact with one side of the positive electrode aluminum cover 31, the side of the positive electrode aluminum cover 31 away from the positive electrode hardware column 32 is in contact with the positive end of the battery roll core 2; the negative electrode hardware ring 4 is clamped with the inner circle of the opening end of the negative electrode steel shell 1, and the end of the negative electrode steel shell 1 away from the opening is in contact with the negative electrode of the battery roll core 2; the BMS main board 5 is arranged on the positive electrode aluminum cover 31, and the negative electrode hardware ring 4 is arranged on the BMS main board 5; wherein, the BMS main board 5 is used to monitor the status of the cylindrical lithium battery.

[0027] In the embodiment of the present application, the above-mentioned positive electrode connection assembly 3 includes a positive electrode aluminum cover 31 and a positive electrode hardware column 32. The bottom side of the positive electrode aluminum cover 31 contacts the positive end of the battery roll core 2, and the side of the positive electrode aluminum cover 31 facing away from the bottom contacts the positive electrode hardware column 32. The above-mentioned positive electrode aluminum cover 31 is in the shape of a "round bowl", so the positive electrode aluminum cover 31 has a concave cavity 311, and the above-mentioned negative electrode hardware ring 4 is clamped with the inner circle of the opening end of the negative electrode steel shell 1. Specifically, the above-mentioned negative electrode hardware ring 4 is in the shape of a circular ring, and spring pieces 41 are arranged at equal intervals on the inner circle of the negative electrode hardware ring 4. When installing the cylindrical lithium battery, when the negative electrode hardware ring 4 is behind the inner circle of the negative electrode steel shell 1, the spring piece 41 is pressed and deformed, so that under the action of the spring piece 41, the negative electrode hardware ring 4 and the negative electrode The contact between the steel shells 1 is stable, which can reduce the generation of resistance and improve the stability of the current. The positive hardware column 32 is in contact with one side of the positive aluminum cover 31 and the other side is in contact with the positive end of the battery core 2, so that the positive hardware column 32 can be in contact with the positive end of the battery core 2 to form an electrical connection. At the same time, a plurality of springs 41 are arranged at intervals on the inner circle of the negative hardware ring 4, so that the negative hardware ring 4 can be clamped with the negative steel shell 1. In addition, the bottom of the negative steel shell 1 is in contact with the negative electrode of the battery core 2, so that a negative electrode loop can be formed, thereby avoiding traditional welding methods, thereby improving the safety and reliability of the battery, improving the efficiency of battery mass production, and realizing automated production.

[0028] The BMS main board 5 is arranged on the positive electrode aluminum cover 31, and the negative electrode hardware ring 4 is covered on the edge of the BMS main board 5. The BMS main board 5 is arranged between the positive electrode connecting component 3 and the negative electrode hardware ring 4. The BMS main board 5 is provided with a management chip 51, and a BMS management system program is built in the chip, which can monitor the status of the cylindrical lithium battery, thereby being able to form control over the cylindrical lithium battery to improve the safety and stability of the cylindrical lithium battery.

[0029] Optional, such as Figure 1 and Figure 2 As shown, the BMS mainboard 5 is also covered with a plastic cover 6 for isolating the positive electrode hardware column 32 from the negative electrode hardware ring 4 , and the positive electrode hardware column 32 is penetrated by the plastic cover 6 .

[0030] In the embodiment of the present application, the above-mentioned plastic cover 6 is arranged on the BMS main board 5, wherein a through hole is provided in the middle of the plastic cover 6 to facilitate the passage of the positive electrode hardware column 32. By providing the plastic cover 6, the negative electrode hardware ring 4 can be isolated from the positive electrode hardware column 32, thereby preventing a short circuit, thereby further improving the safety and stability of the present embodiment.

[0031] Further, such as Figure 1 and Figure 2As shown, the positive electrode hardware column 32 is sequentially penetrated through the plastic cover 6 and the BMS mainboard 5 and contacts with a side of the positive electrode aluminum cover 31 facing away from the battery roll core 2 .

[0032] In the embodiment of the present application, the positive electrode hardware column 32 passes through the plastic cover 6 and the BMS mainboard 5 in sequence and contacts the surface of the positive electrode aluminum cover 31 having the concave cavity 311 , thereby forming positive electrode conduction.

[0033] Optional, such as Figure 1 As shown, a cavity 311 and an explosion-proof bracket 7 are disposed in the cavity 311 on one side of the positive electrode aluminum cover 31 facing the BMS mainboard 5 , and the BMS mainboard 5 is embedded in the explosion-proof bracket 7 .

[0034] In the embodiment of the present application, a concave cavity 311 is concavely provided on one side of the positive aluminum cover 31 facing the BMS main board 5, and the above-mentioned explosion-proof bracket 7 is arranged in the concave cavity 311, and the BMS main board 5 is also embedded in the explosion-proof bracket 7. By setting the explosion-proof bracket 7, the positive electrode connection assembly 3 and the negative electrode hardware ring 4 can be clamped together, and the BMS main board 5 can also be clamped together, thereby improving the utilization rate of the internal space and saving the volume of the circular lithium battery. At the same time, the explosion-proof bracket 7 is adapted to the BMS main board 5 and the positive aluminum cover 31, so that it is easy to assemble and improve production efficiency.

[0035] Optional, such as Figure 3 As shown, it includes a plastic bracket 8 clamped with the negative electrode steel shell 1 , and the positive electrode aluminum cover 31 , the negative electrode hardware ring 4 , the BMS mainboard 5 , and the explosion-proof bracket 7 are all arranged in the plastic bracket 8 .

[0036] In the embodiment of the present application, the above-mentioned plastic bracket 8 is clamped with the open end of the negative electrode steel shell 1, and the above-mentioned positive electrode aluminum cover 31, the negative electrode hardware ring 4, the BMS mainboard 5 and the explosion-proof bracket 7 are all arranged in the plastic bracket 8, so that the above-mentioned positive electrode aluminum cover 31, the negative electrode hardware ring 4, the BMS mainboard 5 and the explosion-proof bracket 7 can be wrapped by the plastic bracket 8, and then they can be formed into a whole, so that the positive and negative electrode connection devices of the cylindrical lithium battery are integrated, making it easy to assemble.

[0037] Optional, such as Figure 2 As shown, a management chip 51 and an LED indicator light 52 are provided on the BMS mainboard 5 for monitoring and controlling the cylindrical lithium battery.

[0038] In the embodiment of the present application, the above-mentioned management chip 51 is arranged on the BMS mainboard 5, and the above-mentioned BMS mainboard 5 can be a PCBA mainboard. The above-mentioned management chip 51 has a built-in program. The cylindrical lithium battery can be monitored and controlled through the built-in program in the management chip 51. At the same time, the cylindrical lithium battery can be monitored and controlled through the LED indicator light 52, so that the user can observe the working status of this embodiment.

[0039] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A positive and negative electrode connection device for a cylindrical lithium battery with a built-in BMS board, comprising a negative electrode steel shell (1), a battery coil core (2) placed in the negative electrode steel shell (1), and a capping mechanism covering the negative electrode steel shell (1) and in contact with the battery coil core (2), characterized in that: The capping mechanism comprises: A positive electrode connection assembly (3), the positive electrode connection assembly (3) comprising a positive electrode aluminum cover (31) and a positive electrode hardware column (32) in contact with one side of the positive electrode aluminum cover (31), and a side of the positive electrode aluminum cover (31) facing away from the positive electrode hardware column (32) in contact with the positive end of the battery coil core (2); A negative electrode hardware ring (4), wherein spring sheets (41) are arranged at intervals at the edge of the inner ring of the negative electrode hardware ring (4), wherein the spring sheets (41) are clamped with the inner ring of the opening end of the negative electrode steel shell (1), and the end of the negative electrode steel shell (1) away from the opening is in contact with the negative electrode of the battery coil core (2); A BMS main board (5), wherein the BMS main board (5) is arranged on the positive electrode aluminum cover (31), and the negative electrode hardware ring (4) is arranged on the BMS main board (5); wherein the BMS main board (5) is used to monitor the status of the cylindrical lithium battery.

2. The positive and negative electrode connection device of a cylindrical lithium battery with a built-in BMS board according to claim 1, characterized in that: The BMS mainboard (5) is also covered with a plastic cover (6) for isolating the positive electrode hardware column (32) from the negative electrode hardware ring (4), and the positive electrode hardware column (32) is penetrated by the plastic cover (6).

3. A cylindrical lithium battery positive and negative electrode connection device with a built-in BMS board according to claim 2, characterized in that: The positive electrode hardware column (32) is sequentially inserted through the plastic cover (6) and the BMS mainboard (5) and is in contact with a side of the positive electrode aluminum cover (31) that is away from the battery coil core (2).

4. The positive and negative electrode connection device of a cylindrical lithium battery with a built-in BMS board according to claim 1, characterized in that: A concave cavity (311) and an explosion-proof bracket (7) disposed in the concave cavity (311) are formed on one side of the positive electrode aluminum cover (31) facing the BMS main board (5), and the BMS main board (5) is embedded in the explosion-proof bracket (7).

5. The positive and negative electrode connection device of a cylindrical lithium battery with a built-in BMS board according to claim 1, characterized in that: It also includes a plastic bracket (8) that is clamped to one end of the negative electrode steel shell (1) near the opening, and the positive electrode aluminum cover (31), the negative electrode hardware ring (4), the BMS mainboard (5), and the explosion-proof bracket (7) are all arranged in the plastic bracket (8).

6. The positive and negative electrode connection device of a cylindrical lithium battery with a built-in BMS board according to claim 1, characterized in that: The BMS mainboard (5) is provided with a management chip (51) and an LED indicator light (52) for monitoring and controlling the cylindrical lithium battery.

Images