Nylon sealing ring assembly of rechargeable lithium battery

Abstract

The utility model discloses a nylon sealing ring assembly of a rechargeable lithium battery. The nylon sealing ring assembly comprises a battery shell, a battery cell and a negative electrode cover, the cathode cover consists of a support frame, a cathode end plate, an electric control plate and a sealing assembly; an embedding groove is formed in the top of the supporting frame, the negative electrode end plate is embedded in the embedding groove, a connecting window is further formed in the bottom of the embedding groove in a penetrating mode, and a power connection piece at the bottom of the negative electrode end plate downwards penetrates through the connecting window and is in contact connection with a battery cell; a charging female seat is integrated on the electric control board, the charging interface is located at the top of the charging female seat, and a charging hole for exposing the top of the charging female seat is further formed in the top of the supporting frame; the sealing assembly comprises a first sealing ring and a second sealing ring; according to the rechargeable lithium battery, the sealing assembly is further arranged in the negative electrode cover, so that connecting gaps on the negative electrode cover are sealed, substances in the battery are effectively prevented from leaking through the gaps, external media are prevented from entering the battery, and the sealing performance of the rechargeable lithium battery is obviously improved.

Description

Technical Field

[0001] The utility model relates to the field of battery sealing rings, in particular to a nylon sealing ring component of a rechargeable lithium battery. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. Due to the extremely active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become mainstream.

[0003] If the original lithium battery needs to be replenished after it is exhausted, it needs to rely on an external charger to recharge it. However, this method not only requires the lithium battery to be equipped with a charger, but is also very inconvenient to operate. Therefore, with the continuous development of battery technology, lithium batteries with charging interfaces set on the surface of the battery have appeared on the market. The lithium battery can be charged by directly connecting the charging cable to the charging interface on the surface of the battery.

[0004] For example, the Chinese patent application with application number CN202410804449.7 discloses: "A USB lithium battery that replaces dry batteries relates to the field of battery technology, including a lithium battery positive terminal inserted into the connection end of a charge and discharge control module and threadedly connected; the charge and discharge control module includes an intelligent circuit controller arranged in a shell, and the shell is used for insulation and flame retardancy; the conductive column is connected to the positive sleeve, and the positive sleeve is sleeved with the positive pole of the lithium battery to form an electrical connection; the inner circumference of the negative contact ring is provided with a connecting thread and is provided on the shell, and the pin of the negative contact ring is electrically connected to the intelligent circuit controller; the outer peripheral wall of the lithium battery is provided with a first insulating layer, a negative connecting ring and a second insulating layer in sequence; one end of the negative connecting ring is electrically connected to the negative pole of the lithium battery, and the outer circumference of the other end is provided with a connecting thread, which completes the structural connection and electrical connection with the negative contact ring when connected to the shell; by quickly replacing the battery cell of the USB lithium battery, the reliability and convenience are improved, and the problem of premature scrapping of the USB lithium battery as a whole due to the inability to replace the battery cell is solved."

[0005] In the solutions described in the above-mentioned patents, in order to set a charging interface on the surface of the lithium battery and charge the battery cells through the charging interface, an electronic control board must be set inside the battery to control the charging. The electronic control board and the setting inside the battery require a bracket structure to support the electronic control board. Often the entire bracket is set at the negative end of the battery and serves as the end cover of the battery. In this case, the bracket not only plays a supporting role, but also needs to play an insulating and sealing role. In particular, since the bracket is set as the negative end plate and needs to be connected to the bracket, and the charging interface also needs to be exposed on the bracket, some gaps will appear on the surface of the battery, resulting in a decrease in the overall sealing of the battery. Summary of the Invention

[0006] In order to overcome the disadvantage of the prior art that the sealing performance of lithium batteries with a charging interface on the surface is reduced due to structural reasons, the utility model provides a nylon sealing ring assembly for a rechargeable lithium battery.

[0007] The technical solution of the utility model to solve the technical problem is: a nylon sealing ring assembly for a rechargeable lithium battery, comprising:

[0008] A battery casing having an open upper end and a closed lower end serving as the positive electrode of the battery;

[0009] A battery cell is provided through the inner wall of the battery housing, and the lower end of the battery cell abuts against the inner side of the lower end of the battery housing;

[0010] A negative electrode cover, which is connected to the opening at the upper end of the battery housing and serves as the negative electrode of the battery. The negative electrode cover is also provided with a charging interface exposed on its surface, and the charging interface forms an electrical connection with the battery cell;

[0011] The negative electrode cover is composed of a support frame, a negative terminal plate, an electric control board and a sealing assembly;

[0012] The top of the support frame is provided with an embedding groove, and the negative terminal plate is embedded in the embedding groove. The bottom of the embedding groove is also provided with a connecting window, and the contact piece at the bottom of the negative terminal plate passes through the connecting window downward and forms a contact connection with the battery cell.

[0013] The support frame is further provided with a support cavity, the electric control board fixing clamp is provided in the support cavity, and the electric control board is integrated with a charging socket, the charging interface is located on the top of the charging socket, and the top of the support frame is further provided with a charging hole for exposing the top of the charging socket;

[0014] The sealing assembly includes a first sealing ring and a second sealing ring; the first sealing ring is fixedly connected to the bottom of the embedding groove and is located on the upper side of the connection window, the power connection plate passes through the first sealing ring, and the first sealing ring abuts against the peripheral side of the power connection plate to form a sealed fit; the second sealing ring is fixedly arranged on the lower side of the charging hole, and the second sealing ring abuts against the peripheral side of the top of the charging socket to form a sealed fit.

[0015] Furthermore, a first sealing groove is recessed downwardly at the bottom of the embedding groove, and the first sealing groove is located on the peripheral side of the connecting window, and the first sealing ring is embedded in the first sealing groove.

[0016] Furthermore, a circle of abutment steps is provided on the lower side of the inner wall of the charging hole, the top of the charging socket abuts against the lower side of the abutment steps, and a circle of second sealing grooves is provided on the inner wall of the charging hole below the abutment steps, and the second sealing ring is embedded in the second sealing groove.

[0017] Furthermore, the support frame includes an upper support and a lower support, the support cavity is located between the upper support and the lower support, and the upper support and the lower support are connected by a connecting structure.

[0018] Furthermore, the connection structure includes a plurality of connecting ribs protruding from the lower end of the upper bracket, and a plurality of connecting grooves opened at the upper end of the lower bracket, and the connecting ribs are plugged into the connecting grooves; the bottom of the connecting grooves also protrudes with a plurality of reinforcement columns, and the bottom of the connecting ribs protrudes with a plurality of reinforcement holes, and the reinforcement columns are plugged into the reinforcement holes.

[0019] Furthermore, a plurality of positioning surfaces are provided on the peripheral side of the electric control board, and the positioning surfaces can form an abutment fit with the inner side surface of the connecting rib, thereby preventing the electric control board from rotating relative to the support frame.

[0020] Furthermore, a plurality of upper supporting ribs are protruding downward from the lower end of the upper bracket, and a plurality of lower supporting ribs are protruding upward from the upper end of the lower bracket. The upper supporting ribs are in contact with the upper side surface of the electric control board, and the lower supporting ribs are in contact with the lower side surface of the electric control board, so that the electric control board is clamped between the upper bracket and the lower bracket, thereby preventing the electric control board from moving up and down relative to the support frame.

[0021] Furthermore, an abutment rib is protruding from the lower side of the edge of the negative end plate, and the abutment rib abuts and fits on the groove wall of the embedding groove. A number of limiting ribs are also protruding from the lower side of the abutment rib, and a number of limiting grooves are opened at the bottom of the embedding groove. The limiting ribs are inserted and fitted into the limiting grooves to prevent the negative end plate from detaching from the embedding groove.

[0022] Furthermore, a positioning groove is formed upwardly at the bottom of the support frame, and the top of the battery cell is plugged into the positioning groove, thereby achieving positioning between the negative electrode cover and the battery cell.

[0023] The assembly process of the rechargeable lithium battery in the present invention: first, the assembly of the negative electrode cover needs to be completed. The first step is to assemble the upper bracket, embed the first sealing ring into the first sealing groove, and embed the second sealing groove into the second sealing groove; the second step is to connect the electric control board to the upper bracket, align the charging socket on the electric control board with the charging hole of the upper bracket and plug it in until the bottom of the charging socket abuts against the abutting step. At this time, the positioning surface on the electric control board also forms an abutment with the inner side surface of the connecting rib, and the electric control board cannot rotate relative to the upper bracket; the third step is to connect the lower bracket to the upper bracket, and the lower bracket is fixed. The upper connecting groove is aligned with the connecting rib and plugged into it. When the connecting rib is plugged into the connecting groove, the reinforcing column is also plugged into the reinforcing hole. At this time, the electric control board is clamped between the upper supporting rib and the lower supporting rib and cannot move up and down relative to the support frame. The fourth step is to connect the negative terminal plate to the upper bracket, align the power connection piece on the negative terminal plate with the connecting window at the bottom of the embedding groove, and embed the negative terminal plate into the embedding groove. At this time, the power connection piece passes through the connection window and extends to the bottom of the support frame, and the limiting rib of the negative terminal plate is also embedded in the limiting groove at the bottom of the embedding groove. At this point, the negative cover is assembled.

[0024] Then the entire negative electrode cover can be placed on the battery cell, and the top of the battery cell can be inserted into the positioning groove at the bottom of the negative electrode cover. At this time, the battery cell is also electrically connected to the electronic control board; finally, the entire battery cell can be inserted into the battery casing, and the negative electrode cover can be closed on the opening of the battery casing to form a connection.

[0025] The beneficial effects of the present invention are:

[0026] 1. A sealing assembly is also provided inside the negative electrode cover. The first sealing ring of the sealing assembly is used to seal the negative terminal plate and the support frame, and the second sealing ring of the sealing assembly is used to seal the charging base and the support frame. Thus, all the connection gaps on the negative electrode cover are sealed, thereby effectively preventing the internal substances of the battery from leaking through these gaps and preventing external media from entering the battery, which significantly improves the sealing performance of the rechargeable lithium battery.

[0027] 2. The support frame consists of an upper bracket and a lower bracket, which can not only better limit and fix the electric control board, but also make the assembly of the entire negative cover more convenient and quick;

[0028] 3. The upper support ribs on the upper bracket and the lower support ribs on the lower bracket are used to restrict the upward and downward movement of the electric control board. The inner side of the connecting ribs on the upper bracket abuts against the positioning surface on the electric control board to restrict the rotation of the electric control board, so that the electric control board can be completely fixed relative to the support frame.

[0029] 4. A positioning groove for positioning and connecting with the battery cell is also provided at the bottom of the support frame, so that the negative electrode cover and the battery cell can be assembled and the negative electrode cover cannot be easily moved relative to the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural diagram of the present utility model.

[0031] Figure 2 It is an explosion diagram of the utility model.

[0032] Figure 3 It is an explosion diagram of the negative electrode cover in the utility model.

[0033] Figure 4 It is a cross-sectional view of one angle of the negative electrode cover in the present invention.

[0034] Figure 5 It is a cross-sectional view of the negative electrode cover in the present invention from another angle.

[0035] Figure 6 It is a schematic diagram of the disassembly of the upper bracket and the first sealing ring in the utility model.

[0036] Figure 7 It is a schematic diagram of the disassembly of the upper bracket and the second sealing ring in the utility model.

[0037] Figure 8 It is a structural diagram of the lower bracket of the utility model.

[0038] Figure 9 It is a structural diagram of the negative terminal plate in the utility model.

[0039] Numbers in the figure: 1. battery casing; 2. battery cell; 3. negative electrode cover; 4. charging interface; 5. support frame; 6. negative terminal plate; 7. electronic control board; 8. embedding groove; 9. connection window; 10. connection plate; 11. support cavity; 12. charging socket; 13. charging hole; 14. first sealing ring; 15. second sealing ring; 16. first sealing groove; 17. abutting step; 18. second sealing groove; 19. upper bracket; 20. lower bracket; 21. connecting rib; 22. connecting groove; 23. reinforcement column; 24. reinforcement hole; 25. positioning surface; 26. upper supporting rib; 27. lower supporting rib; 28. abutting rib; 29. limiting rib; 30. limiting groove; 31. positioning groove. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] It should be understood that although terms such as upper, middle, lower, top, end, etc. appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for ease of understanding, and are not used to define any direction or order limitation.

[0042] Example

[0043] Combine Figures 1 to 9 The nylon sealing ring assembly of a rechargeable lithium battery shown in the figure includes a battery shell 1, a battery cell 2 and a negative electrode cover 3; the upper end of the battery shell 1 is open, while the lower end is closed and serves as the positive electrode of the battery; the battery cell 2 is passed through the inner wall of the battery shell 1, and the lower end is abutted against the inner side of the lower end of the battery shell 1; the negative electrode cover 3 is connected to the opening at the upper end of the battery shell 1 and serves as the negative electrode of the battery, and the negative electrode cover 3 is also provided with a charging interface 4 exposed on its surface, and the charging interface 4 is electrically connected to the battery cell 2; the negative electrode cover 3 is composed of a support frame 5, a negative terminal plate 6, an electronic control board 7 and a sealing assembly; the top of the support frame 5 is provided with an embedding groove 8, and the negative terminal plate 6 is embedded in the embedding groove 8, and the bottom of the embedding groove 8 is also provided with a through-opening connection window 9, and the power connection piece 10 at the bottom of the negative terminal plate 6 faces downward It passes through the connection window 9 and forms a contact connection with the battery cell 2; a support cavity 11 is also provided in the support frame 5, the electric control board 7 is fixedly clamped in the support cavity 11, and a charging socket 12 is integrated on the electric control board 7, the charging interface 4 is located at the top of the charging socket 12, and a charging hole 13 is also opened on the top of the support frame 5 for exposing the top of the charging socket 12; the sealing assembly includes a first sealing ring 14 and a second sealing ring 15; the first sealing ring 14 is fixedly connected to the bottom of the embedding groove 8 and is located on the upper side of the connection window 9, the power connection plate 10 passes through the first sealing ring 14, and the first sealing ring 14 abuts against the peripheral side of the power connection plate 10 to form a sealed fit; the second sealing ring 15 is fixedly provided on the lower side of the charging hole 13, and the second sealing ring 15 abuts against the peripheral side of the top of the charging socket 12 to form a sealed fit.

[0044] In this embodiment, the first sealing ring 14 and the second sealing ring 15 are both made of nylon.

[0045] Combine Figure 4 and Figure 6 As shown, in this embodiment, the bottom of the engaging groove 8 is further recessed with a circle of first sealing groove 16 , and the first sealing groove 16 is located on the peripheral side of the connecting window 9 , and the first sealing ring 14 is embedded in the first sealing groove 16 .

[0046] Combine Figure 5 and Figure 7 As shown, a circle of abutment steps 17 is further provided on the lower side of the inner wall of the charging hole 13 described in this embodiment, and the top of the charging socket 12 abuts against the lower side of the abutment step 17, and a circle of second sealing grooves 18 are also provided on the inner wall of the charging hole 13 below the abutment step 17, and the second sealing ring 15 is embedded in the second sealing groove 18.

[0047] Combine Figures 3 to 5 As shown, in this embodiment, the support frame 5 includes an upper support 19 and a lower support 20, and the support cavity 11 is located between the upper support 19 and the lower support 20. The upper support 19 and the lower support 20 are connected by a connecting structure.

[0048] Combine Figure 7 and Figure 8 As shown, the connection structure described in this embodiment includes a plurality of connecting ribs 21 protruding from the lower end of the upper bracket 19, and a plurality of connecting grooves 22 opened at the upper end of the lower bracket 20, and the connecting ribs 21 are plugged into the connecting grooves 22; the bottom of the connecting grooves 22 are also protruding from a plurality of reinforcement columns 23, and the bottom of the connecting ribs 21 is protruding from a plurality of reinforcement holes 24, and the reinforcement columns 23 are plugged into the reinforcement holes 24.

[0049] Combine Figure 3 and Figure 4 As shown, in this embodiment, a plurality of positioning surfaces 25 are further provided on the peripheral side of the electric control board 7 , and the positioning surfaces 25 can form an abutment fit with the inner side surface of the connecting rib 21 , thereby preventing the electric control board 7 from rotating relative to the support frame 5 .

[0050] Combine Figures 5 to 8 As shown, in this embodiment, the lower end of the upper bracket 19 is further provided with a plurality of upper support ribs 26 protruding downward, and the upper end of the lower bracket 20 is provided with a plurality of lower support ribs 27 protruding upward. The upper support ribs 26 are in contact with the upper side surface of the electric control board 7, and the lower support ribs 27 are in contact with the lower side surface of the electric control board 7, so that the electric control board 7 is clamped between the upper bracket 19 and the lower bracket 20, thereby preventing the electric control board 7 from moving up and down relative to the support frame 5.

[0051] Combine Figure 6 and Figure 9As shown, in this embodiment, the lower side of the edge of the negative terminal plate 6 is further provided with an abutting rib 28, which abuts and fits on the groove wall of the embedding groove 8. A plurality of limiting ribs 29 are further provided on the lower side of the abutting rib 28, and a plurality of limiting grooves 30 are provided at the bottom of the embedding groove 8. The limiting ribs 29 are inserted and fitted into the limiting grooves 30 to prevent the negative terminal plate 6 from detaching from the embedding groove 8.

[0052] Combine Figure 4 and Figure 5 As shown, in this embodiment, a positioning groove 31 is further opened upward at the bottom of the support frame 5, and the top of the battery cell 2 is plugged into the positioning groove 31, thereby achieving positioning between the negative electrode cover 3 and the battery cell 2.

[0053] The assembly process of the rechargeable lithium battery in this embodiment: first, the assembly of the negative electrode cover 3 needs to be completed. The first step is to assemble the upper bracket 19, embed the first sealing ring 14 into the first sealing groove 16, and embed the second sealing groove 18 into the second sealing groove 18; the second step is to connect the electric control board 7 to the upper bracket 19, align the charging socket 12 on the electric control board 7 with the charging hole 13 of the upper bracket 19 and plug it in until the bottom of the charging socket 12 abuts against the abutting step 17. At this time, the positioning surface 25 on the electric control board 7 also forms an abutment with the inner side surface of the connecting rib 21, and the electric control board 7 cannot rotate relative to the upper bracket 19; the third step is to connect the lower bracket 20 to the upper bracket 19, and the lower bracket 20 The connecting groove 22 on the upper side is aligned with the connecting rib 21 and plugged into it. While the connecting rib 21 is plugged into the connecting groove 22, the reinforcing column 23 is also plugged into the reinforcing hole 24. At this time, the electric control board 7 is clamped between the upper support rib 26 and the lower support rib 27 and cannot move up and down relative to the support frame 5. The fourth step is to connect the negative terminal plate 6 to the upper bracket 19, align the power connection piece 10 on the negative terminal plate 6 with the connecting window 9 at the bottom of the embedding groove 8, and embed the negative terminal plate 6 into the embedding groove 8. At this time, the power connection piece 10 extends through the connection window to the bottom of the support frame 5, and the limiting rib 29 of the negative terminal plate 6 is also embedded in the limiting groove 30 at the bottom of the embedding groove 8. At this point, the negative cover 3 is assembled.

[0054] Then, the entire negative electrode cover 3 can be placed on the battery cell 2, and the top of the battery cell 2 can be inserted into the positioning groove 31 at the bottom of the negative electrode cover 3. At this time, the battery cell 2 is also electrically connected to the electronic control board 7; finally, the entire battery cell 2 can be inserted into the battery casing 1, and the negative electrode cover 3 can be placed on the opening of the battery casing 1 to form a connection.

[0055] The advantage of this embodiment is that by setting the sealing component in the negative electrode cover, the connection gaps between the support frame and the negative end plate and between the support frame and the charging base are sealed, thereby greatly improving the sealing of the rechargeable lithium battery.

[0056] The above specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the embodiments as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A nylon sealing ring assembly for a rechargeable lithium battery, comprising: A battery housing (1) having an open upper end and a closed lower end serving as the positive electrode of the battery; A battery cell (2) is provided through the inner wall of the battery housing (1), and the lower end of the battery cell is in contact with the inner side of the lower end of the battery housing (1); A negative electrode cover (3) is connected to the opening at the upper end of the battery housing (1) and serves as the negative electrode of the battery. The negative electrode cover (3) is also provided with a charging interface (4) exposed on its surface. The charging interface (4) forms an electrical connection with the battery cell (2); It is characterized by: The negative electrode cover (3) is composed of a support frame (5), a negative terminal plate (6), an electric control board (7) and a sealing component; The top of the support frame (5) is provided with an embedding groove (8), and the negative terminal plate (6) is embedded in the embedding groove (8), and the bottom of the embedding groove (8) is also provided with a connecting window (9) that passes through. The connecting piece (10) at the bottom of the negative terminal plate (6) passes through the connecting window (9) downward and forms a contact connection with the battery cell (2); The support frame (5) is further provided with a support cavity (11), the electric control board (7) is fixedly clamped in the support cavity (11), and a charging socket (12) is integrated on the electric control board (7), the charging interface (4) is located on the top of the charging socket (12), and the top of the support frame (5) is further provided with a charging hole (13) for exposing the top of the charging socket (12); The sealing assembly includes a first sealing ring (14) and a second sealing ring (15); the first sealing ring (14) is fixedly connected to the bottom of the embedding groove (8) and is located on the upper side of the connection window (9); the power connection plate (10) passes through the first sealing ring (14), and the first sealing ring (14) abuts against the peripheral side of the power connection plate (10) to form a sealed fit; the second sealing ring (15) is fixedly arranged on the lower side of the charging hole (13), and the second sealing ring (15) abuts against the peripheral side of the top of the charging socket (12) to form a sealed fit.

2. The nylon sealing ring assembly for a rechargeable lithium battery according to claim 1, characterized in that: The bottom of the embedding groove (8) is further concavely provided with a circle of first sealing groove (16), and the first sealing groove (16) is located on the peripheral side of the connecting window (9), and the first sealing ring (14) is embedded in the first sealing groove (16).

3. The nylon sealing ring assembly for a rechargeable lithium battery according to claim 1, characterized in that: A circle of abutting steps (17) is also provided on the lower side of the inner wall of the charging hole (13), and the top of the charging socket (12) is abutted against the lower side of the abutting steps (17). A circle of second sealing grooves (18) is also provided on the inner wall of the charging hole (13) below the abutting steps (17), and the second sealing ring (15) is embedded in the second sealing groove (18).

4. The nylon sealing ring assembly for a rechargeable lithium battery according to claim 1, characterized in that: The support frame (5) includes an upper support (19) and a lower support (20), the support cavity (11) is located between the upper support (19) and the lower support (20), and the upper support (19) and the lower support (20) are connected via a connecting structure.

5. The nylon sealing ring assembly for a rechargeable lithium battery according to claim 4, characterized in that: The connection structure includes a plurality of connection ribs (21) protruding from the lower end of the upper bracket (19), and a plurality of connection grooves (22) opened at the upper end of the lower bracket (20), wherein the connection ribs (21) are plugged into the connection grooves (22); a plurality of reinforcement columns (23) are protruding from the bottom of the connection grooves (22), and a plurality of reinforcement holes (24) are protruding from the bottom of the connection ribs (21), wherein the reinforcement columns (23) are plugged into the reinforcement holes (24).

6. The nylon sealing ring assembly for a rechargeable lithium battery according to claim 5, characterized in that: A plurality of positioning surfaces (25) are also provided on the peripheral side of the electric control board (7), and the positioning surfaces (25) can form an abutment fit with the inner side surface of the connecting rib (21), thereby preventing the electric control board (7) from rotating relative to the support frame (5).

7. The nylon sealing ring assembly for a rechargeable lithium battery according to claim 4, characterized in that: The lower end of the upper bracket (19) is further provided with a plurality of upper support ribs (26) protruding downward, and the upper end of the lower bracket (20) is provided with a plurality of lower support ribs (27) protruding upward. The upper support ribs (26) are in contact with the upper side surface of the electric control board (7), and the lower support ribs (27) are in contact with the lower side surface of the electric control board (7), so that the electric control board (7) is clamped between the upper bracket (19) and the lower bracket (20), thereby preventing the electric control board (7) from moving up and down relative to the support frame (5).

8. The nylon sealing ring assembly for a rechargeable lithium battery according to claim 1, characterized in that: The lower side of the edge of the negative terminal plate (6) is also provided with a protruding abutting rib (28), and the abutting rib (28) is in contact with the groove wall of the embedding groove (8). The lower side of the abutting rib (28) is also provided with a plurality of limiting ribs (29), and the groove bottom of the embedding groove (8) is provided with a plurality of limiting grooves (30). The limiting ribs (29) are plugged into the limiting grooves (30) to prevent the negative terminal plate (6) from being separated from the embedding groove (8).

9. The nylon sealing ring assembly for a rechargeable lithium battery according to claim 1, characterized in that: The bottom of the support frame (5) is also provided with a positioning groove (31) extending upwards, and the top of the battery cell (2) is plugged into the positioning groove (31), thereby achieving positioning between the negative electrode cover (3) and the battery cell (2).

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