Pole module, top cover and battery

Abstract

The utility model relates to the field of batteries, particularly provides a pole module, a top cover and a battery, and aims to solve the problem that an existing pole module cannot enhance the anti-torsion capability on the premise of improving the manufacturing convenience. In order to achieve the purpose, the pole module of the battery comprises a pole, a connecting ring and upper plastic, the pole is sleeved with the connecting ring, a filling space is formed between the pole and the connecting ring, and a limiting structure is arranged on a wall body corresponding to the filling space; the filling space is filled with the upper plastic, and the upper plastic and the limiting structure form limiting to limit relative rotation of the upper plastic in the circumferential direction. With the adoption of the technical scheme, the anti-torsion capability of the post terminal module can be enhanced on the premise of improving the manufacturing convenience of the post terminal module. In addition, the production efficiency of the battery can be higher, and meanwhile, the overall rejection rate of the battery top cover is reduced, so that the production cost of the battery is reduced, and the profit rate is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and specifically provides a terminal module, a top cover and a battery. Background Art

[0002] With the increasing prominence of environmental problems and the development of low-carbon economy, the new energy industry has become the mainstream of future economic development. Among them, the battery, as a carrier for storing electric energy, can be used to store and transport the electric energy produced by power plants, which is of great significance to the development of the new energy industry. The lithium-ion battery is an efficient energy storage device and has become the key object of research and development for energy storage batteries.

[0003] At present, most of the top covers on the market are fixed by riveting the terminal, the upper plastic, the cover shell, the riveted aluminum block and the sealing ring, without modular design, that is, the terminal, the upper plastic and the sealing ring can only be assembled with the cover shell at the same time. Or modular design is carried out, but in order to prevent the terminal assembly from twisting itself, a complex anti-twisting structure is required, so that the terminal module cannot enhance the anti-twisting ability while improving the manufacturing convenience.

[0004] Correspondingly, there is a need in the art for a new terminal module, top cover and battery to solve the above problems. Summary of the Utility Model

[0005] The present application aims to solve the above technical problems, that is, to solve the problem that the existing terminal module cannot enhance the anti-twisting ability while improving the manufacturing convenience.

[0006] On the one hand, the present application provides a terminal module of a battery, including: a terminal; a connecting ring sleeved outside the terminal, a filling space is formed between the terminal and the connecting ring, and a limiting structure is arranged on the wall body corresponding to the filling space; an upper plastic filled in the filling space, and the upper plastic and the limiting structure form a limit to restrict the upper plastic from rotating circumferentially relative to each other.

[0007] In the case of adopting the above technical solution, during the injection molding process, the plastic material flows into the filling space between the terminal and the connecting ring, and flows to be combined with the limiting structure on the wall body corresponding to the filling space. After the plastic material is cured, the upper plastic and the limiting structure restrict each other, forming an effective limit, restricting the upper plastic from rotating circumferentially relative to each other, enhancing the anti-twisting ability, and thus enhancing the safety performance of the battery. Since an effective limit can be formed to prevent the upper plastic from rotating circumferentially relative to each other after the injection molding process, and at the same time, the terminal module is also formed. Therefore, the above setting method can enhance the anti-twisting ability of the terminal module while improving the manufacturing convenience. In addition, it can also make the production efficiency of the battery higher, and at the same time reduce the overall scrap rate of the battery top cover, thereby reducing the production cost of the battery and increasing the profit rate.

[0008] In the optional technical solution of the above-mentioned terminal module, the terminal module further includes a sealing ring, the sealing ring is pressed between the connecting ring and the terminal, and a filling space is formed among the terminal, the sealing ring and the connecting ring.

[0009] The sealing ring can be first pressed between the connecting ring and the terminal so that the sealing ring is in a compressed state, and then these three components are placed into an injection mold for injection molding. The plastic material flows into the filling space formed among the terminal, the connecting ring and the sealing ring, and flows to combine with the limiting structure on the wall body corresponding to the filling space. After the plastic material is cured, a modular combination including the terminal, the sealing ring, the upper plastic and the connecting ring is formed, thereby improving the manufacturing convenience of the terminal module.

[0010] In the optional technical solution of the above-mentioned terminal module, the wall body constitutes the wall body of the connecting ring, the limiting structure includes a limiting hole formed on the connecting ring, and the upper plastic is formed with a plastic column, and the plastic column is arranged in the limiting hole.

[0011] In the case of adopting the above technical solution, the upper plastic and the connecting ring can be restricted from rotating relative to each other through the cooperation of the limiting hole and the plastic column, which limits the relative rotation between the upper plastic and the connecting ring and enhances its anti-torsion ability. In addition, after injection molding, the tight fit and stability between components can be ensured, the quality problems caused by component loosening or mismatch are reduced, and the consistency and reliability of the battery top cover are guaranteed. It can also simplify the assembly steps, reduce the assembly time and complexity, and improve the production efficiency of the battery.

[0012] In the optional technical solution of the above-mentioned terminal module, an annular groove is formed in the upper plastic, the connecting ring is arranged in the annular groove, and the plastic column penetrates through the limiting hole and is connected to opposite sides of the inner wall of the annular groove.

[0013] Since the plastic column penetrates through the limiting hole of the connecting ring and is connected to both sides of the inner wall of the annular groove, a multi-point fixing structure is formed, so that the connecting ring is in a controlled state in the annular groove, thereby significantly improving the stability of the whole structure. Moreover, the double-end fixing of the plastic column and the surrounding of the annular groove limit the rotational freedom of the connecting ring, prevent any circumferential rotation between the connecting ring and the upper plastic, and can maintain a tight connection even under repeated use or external impact, prevent loosening, and ensure the long-term reliability of the structure. Especially, the advantages are more obvious under high-load or frequent-use conditions.

[0014] In the optional technical solution of the above-mentioned terminal module, the wall body also constitutes the wall body of the terminal, and the limiting structure further includes a first anti-torsion structure formed on the side wall of the terminal. A second anti-torsion structure is formed on the upper plastic. The first anti-torsion structure cooperates with the second anti-torsion structure to limit the circumferential rotation of the upper plastic.

[0015] In the case of adopting the above technical solution, the upper plastic can be prevented from twisting relative to the terminal. Combining with the matching structure of the glue column of the upper plastic and the limiting hole, the overall structure of the terminal module can be very stable, and the anti-torsion ability of the top cover can be enhanced after being connected to the cover shell, thereby improving the safety performance of the battery.

[0016] In the optional technical solution of the above-mentioned terminal module, the first anti-torsion structure includes a cut surface formed on the circumference of the outer wall of the terminal and a first arc surface protruding outward. The cut surface and the first arc surface are connected end to end. The second anti-torsion structure includes a convex surface formed on the circumference of the upper plastic and a second arc surface recessed inward. The convex surface and the second arc surface are connected end to end. The cut surface is attached to the convex surface, and the first arc surface is attached to the second arc surface.

[0017] In the case of adopting the above technical solution, the relative position between the upper plastic and the terminal can be ensured to be fixed, making the structure more stable and preventing torsional loosening. And the stress distribution between the upper plastic and the terminal is more uniform, reducing material fatigue and structural damage, and prolonging the service life of the product.

[0018] In the optional technical solution of the above-mentioned terminal module, a first limiting protrusion is formed on the side wall of the annular groove. The limiting structure further includes a first limiting groove formed on the connecting ring. The first limiting protrusion is arranged in the first limiting groove; and / or a second limiting groove is formed on the side wall of the annular groove. The limiting structure further includes a second limiting protrusion formed on the connecting ring. The second limiting protrusion is arranged in the second limiting groove.

[0019] In the case of adopting the above technical solution, the rotation of the upper plastic relative to the connecting ring can be further restricted. And through the design of multi-point limiting, the stress is effectively evenly distributed in different parts of the module, greatly improving the anti-deformation ability and durability of the component, keeping the structural integrity under various stress conditions, reducing damage caused by torsion, and ensuring the use safety.

[0020] In the alternative technical solution of the above-mentioned pole module, the connecting ring includes a connecting body and a first bent portion bent inward from the connecting body. The shape formed by the connecting body and the first bent portion is adapted to the annular groove. The pole includes a base and a pole boss provided on the base. The connecting body is located on the periphery of the base, and the first bent portion is located on the periphery of the pole boss. The pole module further includes a sealing ring, and the sealing ring is pressed between the bottom side of the first bent portion and the top side of the base. The upper plastic is attached to the base and the pole boss, and the limiting hole is provided on the connecting body.

[0021] In the case of adopting the above technical solution, when injecting the pole, the sealing ring and the connecting ring, first attach the top surface of the sealing ring to the bottom surface of the first bent portion, and the bottom surface of the sealing ring contacts the top surface of the base. Then press the pole upward as a whole so that the sealing ring is in a compressed state. Then put these three into the injection mold for injection. Part of the plastic material will flow into the upper filling space, and the other part will flow into the lower filling space through the limiting hole on the connecting body, which improves the flow rate. After the plastic material solidifies, it can wrap the connecting ring, and the plastic material in the limiting hole forms a glue column, and both ends of the glue column are formed on the inner walls of the opposite sides of the annular groove of the upper plastic. The above setting method can ensure that the plastic material can be evenly distributed and quickly fill the gaps while preventing the pole from coming out, reducing the injection time, and improving the production convenience and production efficiency.

[0022] In the alternative technical solution of the above-mentioned pole module, the connecting body forms a second bent portion bent inward at the other end relative to the first bent portion. The second bent portion is located on the bottom side of the base, and the upper plastic is filled between the second bent portion and the base.

[0023] In the case of adopting the above technical solution, since the second bent portion is located on the bottom side of the base and the upper plastic is also filled between the second bent portion and the base, combined with the setting of the first bent portion and the sealing ring above the base, the base can be firmly clamped, improving the anti-deformation ability of the overall structure.

[0024] In the alternative technical solution of the above-mentioned pole module, the connecting body forms a third bent portion bent outward at the other end relative to the first bent portion. The third bent portion is suitable for being fixedly connected to the connecting groove at the bottom side of the through hole of the battery cover.

[0025] In the case of adopting the above technical solution, it can prevent the pole module from twisting relative to the through hole, enhance the structural stability, and improve the anti-twisting ability of the entire top cover. And since the connecting groove is provided at the bottom side of the through hole of the battery cover and the third bent portion is fixedly connected to the connecting groove, the pole module can be prevented from coming out of the through hole.

[0026] On the other hand, the present application also provides a top cover of a battery. The top cover includes a cover shell and the pole module described in any one of the above, and a through hole is provided on the cover shell. The connecting ring is fixedly connected to the through hole so that the pole module is disposed in the through hole.

[0027] In the case of adopting the above technical solution, the anti-torsion ability of the entire battery top cover can be improved, and the safety performance of the battery is increased.

[0028] On the other hand, the present application also provides a battery, which includes the top cover of the battery described in any one of the above embodiments.

[0029] After the battery has the above top cover, the safety of battery use can be improved, the scrap rate of the battery can be reduced, the production cost of the battery can be reduced, and the profit margin can be increased. Description of the Drawings

[0030] The preferred embodiments of the present application will be described below with reference to the drawings. In the drawings:

[0031] Figure 1 is a cross-sectional view of one end of the top cover of the present application;

[0032] Figure 2 is a schematic structural view of the pole of the present application;

[0033] Figure 3 is a cross-sectional view of the pole of the present application;

[0034] Figure 4 is a schematic structural view of the connecting ring of the present application;

[0035] Figure 5 is a cross-sectional view of the connecting ring of the present application;

[0036] Figure 6 is a schematic structural view of the upper plastic of the present application;

[0037] Figure 7 is a cross-sectional view of the upper plastic of the present application;

[0038] Figure 8 is a schematic structural view of the cover shell of the present application;

[0039] Figure 9 is a schematic structural view of the adapter piece of the present application;

[0040] Figure 10 is a schematic structural view of the lower plastic of the present application;

[0041] Figure 11 is a bottom view of one end of the top cover of the present application.

[0042] Description of the Reference Numerals:

[0043] 1 - Pole column; 11 - Base; 111 - Cut surface; 112 - First arc surface; 12 - Pole column boss; 13 - Copper block; 14 - Aluminum block; 15 - Weight reduction groove; 2 - Connecting ring; 21 - Connecting body; 211 - Limiting hole; 212 - First limiting groove; 22 - First bending part; 23 - Second bending part; 24 - Third bending part; 3 - Upper plastic; 31 - Inner ring body; 311 - Convex surface; 312 - Second arc surface; 313 - First limiting protrusion; 32 - Outer ring body; 33 - Extension body; 34 - Glue column; 35 - Annular groove; 36 - Glue ring; 4 - Cover shell; 41 - Through hole; 42 - Connecting groove; 5 - Adapter plate; 51 - Adapter body; 52 - Adapter boss; 53 - Adapter groove; 6 - Lower plastic; 61 - Accommodating hole; 7 - Sealing ring. Detailed implementation manner

[0044] First of all, it should be noted that the following implementation manners are only used to explain the technical principle of this application, and are not intended to limit the protection scope of this application. In order to better illustrate this application, numerous specific details are given in the following detailed implementation manners. Those skilled in the art should understand that this application can also be implemented without some specific details.

[0045] It should be noted that in the description of this application, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0046] It should be noted that in the description of this application, "upper" and "top" refer to the direction away from the battery cell in the thickness direction of the cover shell 4, and "lower" and "bottom" refer to the direction close to the battery cell in the thickness direction of the cover shell 4.

[0047] This application provides a top cover of a battery, as Figures 1 to 8 shown, the top cover includes a cover shell 4 and a pole column module. The cover shell 4 can be a light aluminum sheet, and a through hole 41 is provided on the cover shell 4, and this through hole 41 is used to accommodate the pole column module. The pole column module includes a pole column 1 and a packaging component. The packaging component is used to package the pole column 1 to jointly form the pole column module with the pole column 1. The packaging component includes a connecting ring 2, a sealing ring 7 and an upper plastic 3. The connecting ring 2 is fixed to the through hole 41 and sleeved outside the pole column 1. The sealing ring 7 is pressed between the connecting ring 2 and the pole column 1. A filling space is formed between the pole column 1, the connecting ring 2 and the sealing ring 7. A limiting structure is provided on the wall body corresponding to the filling space. The upper plastic 3 is filled in the filling space to fix the relative positions of the pole column 1 and the connecting ring 2. The upper plastic 3 and the limiting structure form a limit to restrict the circumferential rotation of the upper plastic 3. The sealing ring 7 is preferably a hollow circular ring, so as to facilitate compression and fitting to prevent the electrolyte inside the battery from overflowing. It can be understood that the wall body corresponding to the filling space can be the wall body of the connecting ring 2, or the wall body of the pole column 1, or the wall bodies of both the connecting ring 2 and the pole column 1 at the same time.

[0048] First, the sealing ring 7 is pressed between the connecting ring 2 and the pole 1, so that the sealing ring 7 is in a compressed state, and then the three are placed in the injection mold for injection molding, and the plastic material flows into the filling space formed between the pole 1, the connecting ring 2 and the sealing ring 7, and flows to the limiting structure on the wall corresponding to the filling space to combine with it. After the plastic material is solidified, a modular combination including the pole 1, the sealing ring 7, the upper plastic 3 and the connecting ring 2 is formed, wherein the upper plastic 3 formed and the limiting structure mutually restrict each other, forming an effective limit, limiting the relative rotation of the upper plastic 3 along the circumferential direction, enhancing the anti-twist ability, and thus enhancing the safety performance of the battery. Since after the injection molding process, an effective limit can be formed to prevent the upper plastic 3 from rotating relative to the circumferential direction, and a pole module is also formed. Therefore, the above-mentioned setting method can enhance its anti-twist ability while improving the manufacturing convenience of the pole module. In addition, it can also make the production efficiency of the battery higher, and at the same time reduce the overall scrap rate of the battery top cover, thereby reducing the production cost of the battery and improving the profit margin.

[0049] Possibly, refer to 1 to Figure 3 The pole 1 of the present application includes a base 11 and a pole boss 12 disposed on the base 11. Further, a top boss may be disposed on the top surface of the pole boss 12. Figure 1 , Figure 4 , Figure 5 The connecting ring 2 includes a connecting body 21 and an annular first bending portion 22 bent inward from the connecting body 21. The bending angle of the first bending portion 22 can be 45°-90° to prevent the pole 1 from slipping out through the through hole 41. A limiting hole 211 is provided on the connecting body 21. The number of the limiting holes 211 is preferably greater than 1, and can be set in the middle of the connecting body 21 in the vertical direction. Among them, the connecting body 21 is located on the periphery of the base 11, the first bending portion 22 is located on the periphery of the pole boss 12, and the first bending portion 22 is located above the base 11. The sealing ring 7 is pressed between the bottom side of the first bending portion 22 and the top side of the base 11, so that the sealing ring 7 separates the space between the pole 1 and the connecting ring 2 to form an upper filling space and a lower filling space. The limiting hole 211 is located on the connecting ring 2 corresponding to the lower filling space, that is, on the connecting body 21. Possibly, an annular groove 35 is formed in the upper plastic 3, the shape formed by the connecting body 21 and the first bent portion 22 is adapted to the annular groove 35, the connecting ring 2 is arranged in the annular groove 35, the rubber column 34 passes through the limiting hole 211 and is connected to the opposite sides of the inner wall of the annular groove 35, and the upper plastic 3 fits the base 11 and the pole boss 12. It can be understood that in this case, the wall body corresponding to the filling space is the wall body of the connecting ring 2.

[0050] That is to say, when the pole 1, the sealing ring 7 and the connecting ring 2 are subjected to the injection molding process, first, the top surface of the sealing ring 7 is attached to the bottom surface of the first bending portion 22, and the bottom surface of the sealing ring 7 is in contact with the top surface of the base 11. Then, the pole 1 is pressed upward as a whole, so that the sealing ring 7 is in a compressed state. Then, these three are placed into an injection mold for injection molding. Part of the plastic material will flow into the upper filling space, and the other part will flow into the lower filling space through the limiting holes 211 on the connecting body 21, improving the flow rate. After the plastic material is cured, it can wrap the connecting ring 2, and the plastic material in the limiting holes 211 forms the glue columns 34. Both ends of the glue columns 34 are formed on the opposite inner walls of the annular groove 35 of the upper plastic 3. Among them, the glue columns 34 are in seamless contact with the limiting holes 211.

[0051] Since the glue columns 34 penetrate through the limiting holes 211 of the connecting ring 2 and are connected to both sides of the inner wall of the annular groove 35, a multi-point fixing structure is formed, making the connecting ring 2 in a controlled state in the annular groove 35, thus significantly improving the stability of the entire structure. Moreover, the double-end fixing of the glue columns 34 and the surrounding of the annular groove 35 limit the rotational freedom of the connecting ring 2, preventing any circumferential rotation between the connecting ring 2 and the upper plastic 3. Even under repeated use or external impact, a tight connection can be maintained, preventing loosening and ensuring the long-term reliability of the structure. Especially under high-load or frequent-use conditions, the advantages are more obvious.

[0052] Possibly, referring to Figure 1 、 Figure 6 and Figure 7 ,the upper plastic 3 includes an inner ring body 31, an outer ring body 32 and an extension body 33. The end of the outer ring body 32 bends inward, and the extension body 33 is formed by bending from this end to the bottom side. The inner ring body 31 and the outer ring body 32 are connected by the above-mentioned glue columns 34. The annular groove 35 mentioned above is formed between the inner ring body 31, the outer ring body 32 and the extension body 33. The surface of the inner ring body 31 away from the outer ring body 32 in the thickness direction is attached to the outer peripheral wall of the base 11. The surface of the inner ring body 31 close to the outer ring body 32 in the thickness direction is attached to the connecting ring 2. The surface of the outer ring body 32 close to the inner ring body 31 in the thickness direction is attached to the connecting ring 2. The extension body 33 is attached between the cross section of the first bending portion 22 and the outer peripheral wall of the pole boss 12. An annular sealing port is formed between the extension body 33 and the end of the inner ring body 31. The sealing ring 7 is attached to the bottom surface of the first bending portion 22 through this annular sealing port, and the sealing ring 7 is also attached to the inner ring body 31.

[0053] Possibly, the connecting body 21 forms a ring-shaped second bending part 23 that bends inwardly at the other end relative to the first bending part 22. The second bending part 23 is located on the bottom side of the base 11, and the upper plastic 3 is also filled between the second bending part 23 and the base 11. It can also be said that a rubber ring 36 that bends inwardly is formed at the bottom end of the inner ring body 31. The bottom surface of the rubber ring 36 fits against the top surface of the second bending part 23, and the top surface of the rubber ring 36 fits against the bottom surface of the base 11.

[0054] Since the second bending part 23 is located on the bottom side of the base 11 and the upper plastic 3 is also filled between the second bending part 23 and the base 11, combined with the settings of the first bending part 22 above the base 11 and the sealing ring 7, the base 11 can be firmly clamped, improving the anti-deformation ability of the overall structure.

[0055] Possibly, the connecting body 21 forms a ring-shaped third bending part 24 that bends outwardly at the other end relative to the first bending part 22. A connecting groove 42 is provided at the bottom side of the through hole 41 of the battery cover 4. The third bending part 24 is fixedly connected to the connecting groove 42, such as by welding connection, but this is not restrictive. As long as the fixed connection between the third bending part 24 and the connecting groove 42 can be achieved, the connection method can be changed, such as riveting, etc. Specifically, the outer cross-section of the third bending part 24 can fit against the side surface of the connecting groove 42, and the upper surface of the third bending part 24 can fit against the upper end surface of the connecting groove 42. In addition, the lower end surface of the outer ring body 32 can fit against the remaining upper surface of the third bending part 24, and a gap of 0.2 mm - 0.5 mm can be left between the outer ring body 32 and the through hole 41 of the cover 4 for convenient installation.

[0056] The above setting method can prevent the pole module from twisting relative to the through hole 41, enhancing the structural stability and improving the anti-twisting ability of the entire top cover. And since the connecting groove 42 is provided at the bottom side of the through hole 41 of the battery cover 4 and the third bending part 24 is fixedly connected to the connecting groove 42, the pole module can be prevented from disengaging from the through hole 41.

[0057] Possibly, the limiting structure further includes a first anti-twisting structure formed on the side wall of the pole 1, and a second anti-twisting structure is formed on the upper plastic 3. The first anti-twisting structure and the second anti-twisting structure cooperate to limit the circumferential rotation of the upper plastic 3. This setting method can prevent the upper plastic 3 from twisting relative to the pole 1. Combining with the cooperation structure between the rubber column 34 of the upper plastic 3 and the limiting hole 211, the overall structure of the pole module can be very stable, enhancing the anti-twisting ability of the top cover after being connected to the cover 4, and thus improving the safety performance of the battery. It can be understood that in this case, the wall body corresponding to the filling space is the wall body of the pole 1. The limiting structure can be formed on the wall body of the pole 1 and the wall body of the connecting ring 2 at the same time, or on one of them.

[0058] As a possible implementation, referring to Figure 2 , the first anti-twist structure includes a cut surface 111 formed on the outer circumference of the outer wall of the pole 1 and a first arc surface 112 protruding outward. The cut surface 111 and the first arc surface 112 are connected end to end. Referring to Figure 6 and Figure 7 , the second anti-twist structure includes a convex surface 311 formed on the outer circumference of the upper plastic 3 and a second arc surface 312 recessed inward. The convex surface 311 and the second arc surface 312 are connected end to end. The cut surface 111 is in contact with the convex surface 311, and the first arc surface 112 is in contact with the second arc surface 312.

[0059] The above setting method can ensure the relative position fixation between the upper plastic 3 and the pole 1, making the structure more stable and preventing torsional loosening. And it makes the stress distribution between the upper plastic 3 and the pole 1 more uniform, reduces material fatigue and structural damage, and extends the service life of the product.

[0060] Preferably, the above first anti-twist structure is formed on the outer circumference of the base 11. The outer circumference of the base 11 can be integrally circular. A cut surface 111 is arranged at intervals of the first arc surface 112 in the circumference of the circle. The numbers of the cut surface 111 and the first arc surface 112 are both greater than 1. The above convex surface 311 and the second arc surface 312 can be arranged on the surface of the inner ring body 31 of the upper plastic 3 far from the outer ring body 32 in the thickness direction. Preferably, the numbers of the convex surface 311 and the second arc surface 312 segments are both greater than 1. Each cut surface 111 is in close contact with each convex surface 311 one by one, and each first arc surface 112 is in close contact with each second arc surface 312 one by one, so as to realize a multi-point contact design, making the structure more uniform when stressed, reducing local stress concentration, and further improving stability.

[0061] It should be noted that the specific forms of the above first anti-twist structure and the second anti-twist structure are not fixed. As long as the circumferential rotation of the upper plastic 3 relative to the pole 1 can be restricted, its setting method can be adjusted. For example, the first anti-twist structure can be set as a boss / groove on the base 11, and the second anti-twist structure can be set as a groove / boss on the upper plastic 3. The boss / groove and the groove / boss cooperate to achieve anti-torsion, etc. These adjustments do not deviate from the principle of the present application and are within the protection scope of the present application.

[0062] As a possible implementation, referring to Figure 6 , a first limiting protrusion 313 is formed on the side wall in the annular groove 35. Referring to Figure 4, the limiting structure further includes a first limiting groove 212 formed on the connecting ring 2, and the first limiting protrusion 313 is disposed in the first limiting groove 212. Possibly, the first limiting protrusion 313 is arranged on the surface of the inner ring body 31 close to the outer ring body 32 in the thickness direction, and the first limiting groove 212 is arranged on the inner surface of the connecting body 21. The first limiting protrusion 313 cooperates with the first limiting groove 212 to further limit the rotation of the upper plastic 3 relative to the connecting ring 2. It should be noted that the setting positions of the above-mentioned first limiting protrusion 313 and first limiting groove 212 are only exemplary and are not intended to limit the protection scope of the present application. For example, the first limiting protrusion 313 can be arranged on the outer ring body 32, and the first limiting groove 212 can be arranged on the outer surface of the connecting body 21, etc. These adjustments do not deviate from the principle of the present application and are all within the protection scope of the present application.

[0063] As a possible implementation manner, a second limiting groove is formed on the side wall in the annular groove 35. The limiting structure further includes a second limiting protrusion formed on the connecting ring 2, and the second limiting protrusion is disposed in the second limiting groove. Possibly, the second limiting groove is arranged on the surface of the inner ring body 31 close to the outer ring body 32 in the thickness direction, and the second limiting protrusion is arranged on the inner surface of the connecting body 21. The second limiting groove cooperates with the second limiting protrusion to further limit the rotation of the upper plastic 3 relative to the connecting ring 2. It should be noted that the setting positions of the above-mentioned second limiting groove and second limiting protrusion are only exemplary and are not intended to limit the protection scope of the present application. For example, the second limiting groove can be arranged on the outer ring body 32, and the second limiting protrusion can be arranged on the outer surface of the connecting body 21, etc. These adjustments do not deviate from the principle of the present application and are all within the protection scope of the present application.

[0064] The above setting method can further effectively limit the rotation of the upper plastic 3 relative to the connecting ring 2, and through the design of multi-point limiting, the stress is effectively evenly distributed on different parts of the module, greatly improving the anti-deformation ability and durability of the component, keeping the structural integrity under various stress conditions, reducing the damage caused by torsion, and ensuring the use safety.

[0065] As a possible implementation manner, refer to Figures 1 to 3 and Figure 9, a weight-reducing groove 15 is formed at the bottom of the terminal post 1. The top cover further includes an adapter piece 5. The adapter piece 5 includes an adapter body 51 and an adapter boss 52. The adapter body 51 includes a first surface and a second surface opposite to each other. The adapter boss 52 is formed on the first surface, so that an adapter piece groove 53 is formed at the position of the second surface corresponding to the adapter boss 52. The adapter body 51 is arranged on the back side of the cover shell 4, and the adapter boss 52 is located in the through hole 41 and connected to the weight-reducing groove 15. The depth of the weight-reducing groove 15 can be 1 mm - 3 mm. It can be understood that in the case where the terminal post 1 includes a base 11 and a terminal post boss 12, the weight-reducing groove 15 is formed at the bottom of the base 11. It can be understood that the first surface and the second surface refer to two surfaces opposite to each other in the thickness direction of the adapter body, that is, the front surface and the back surface of the adapter body. Among them, the front surface of the adapter body faces the cover shell, and the back surface of the adapter body faces away from the cover shell.

[0066] The terminal post of the traditional structure is usually designed as a solid structure for providing current conduction inside the battery. In order to achieve current conduction, the terminal post needs to be arranged on the front side of the cover shell, and the adapter piece needs to be fixed on the back side of the cover shell. Therefore, in order to connect the terminal post and the adapter piece, the terminal post will pass through the through hole on the cover shell and be connected to the adapter piece such as by bolts, making the overall weight heavier. In this application, a weight-reducing groove 15 is formed at the bottom of the terminal post 1, and the adapter boss 52 is located in the through hole 41 and connected to the weight-reducing groove 15, so that the terminal post 1 does not need to pass through the through hole 41, and the terminal post 1 can be effectively thinned. At the same time, the design of the adapter piece 5 can reduce the use of materials, reduce the unnecessary material thickness and weight, and further reduce the weight of the top cover of the battery, realizing lightweight design, thereby improving the energy density of the battery. At the same time, the existence of the adapter boss 52 increases the rigidity of the structure. Since the adapter boss 52 is embedded in the through hole 41 and connected to the weight-reducing groove 15, it is equivalent to adding additional support in the key stress area, which can effectively resist external pressure or impact, prevent the cover shell 4 and the terminal post 1 from deforming, and can also reduce the relative displacement between the terminal post 1 and the cover shell 4, preventing the separation of components caused by vibration or temperature change during use. Therefore, this setting method can also improve the stability of the structure.

[0067] Possibly, the adapter boss 52 is located at the middle position of the adapter body 51, and the adapter boss 52 is welded to the weight-reducing groove 15. Since the adapter boss 52 is welded to the weight-reducing groove 15, there is no need for additional connecting parts (such as screws or brackets), thus reducing the total weight. In addition, a first connecting arm and a second connecting arm can be arranged on the adapter body 51. The first connecting arm and the second connecting arm can be arranged on the same side, and the first connecting arm and the second connecting arm are used to be fixedly connected to the electrode tabs of the bare battery cell respectively.

[0068] As a possible implementation, the pole 1 is formed with a weight-reducing groove 15 by stamping, which has higher production efficiency and simpler processes than the turning and milling process, and can effectively reduce the manufacturing cost of the pole 1. In addition, by stamping the weight-reducing groove 15, the structural optimization of the pole 1 is more reasonable, so that the weight-reducing groove 15 not only reduces the weight of the pole 1, but also improves the heat dissipation performance and strength distribution, making the overall performance of the battery better.

[0069] As a possible implementation method, refer to Figure 3 , the pole 1 is a metal composite plate arranged in a stacked manner. For example, the pole 1 is a copper-aluminum composite plate, the copper block 13 is fixedly connected under the aluminum block 14, and the pole 1 can be a negative pole 1. Since the metal composite plate can allow a larger bending, it allows a larger deformation during the stamping process, and is not easy to break or damage, and the success rate in stamping is higher. Due to the low density of aluminum, using the aluminum block 14 as the main material of the pole 1 can significantly reduce the weight of the pole 1. At the same time, the high conductivity of copper ensures the current conduction performance. Through this combination of materials, the pole 1 can maintain excellent conductivity and mechanical strength while reducing the weight, thereby realizing the lightweight design of the battery and improving the energy density and efficiency of the battery.

[0070] As a possible implementation method, refer to Figure 1 , Figure 10 and Figure 11 The top cover also includes a lower plastic 6, which is disposed between the adapter body 51 and the cover shell 4. The lower plastic 6 is provided with a receiving hole 61 extending in the direction opposite to the adapter body 51, that is, extending upward. The receiving hole 61 is disposed in the ring of the connecting ring 2, and the connecting boss 52 is disposed in the receiving hole 61, so that the connecting boss 52 can pass through the receiving hole 61. Since the receiving hole 61 is disposed between the connecting ring 2 and the connecting boss 52, the connecting sheet 5 can be prevented from contacting the connecting ring 2, effectively preventing the occurrence of electrical short circuit, and improving the safety and reliability of the battery, especially in a high-load working environment.

[0071] The height of the receiving hole 61 can be 1mm-1.5mm. A gap is left between the outer surface of the receiving hole 61 and the cross section of the second bending portion 23, for example, a gap of 0.1mm-1mm, to facilitate assembly. The lower plastic 6 and the cover shell 4 can be fixedly connected by ultrasonic welding. However, this is not restrictive. As long as the lower plastic 6 can be fixedly connected to the cover shell 4, the connection method can be adjusted, such as riveting, laser spot welding, press-fit connection, etc. These adjustments do not deviate from the principles of this application and are within the scope of protection of this application.

[0072] It should be noted that the specific implementation of the relative positions of the upper plastic fixed pole column and the connecting ring is not fixed and can be adjusted. For example, fixing grooves are formed on the side wall of the pole column and the connecting ring, and fixing posts are formed on the relative two sides of the upper plastic, such as the inner ring body. The fixing posts on both sides are respectively fixed in the fixing grooves of the pole column and the connecting ring, etc. These adjustments do not deviate from the principle of the present application and are all within the protection scope of the present application.

[0073] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present application.

Claims

1. A pole module of a battery, characterized in that, Comprising: Terminal post; Connection ring, the connection ring is sleeved outside the terminal post, a filling space is formed between the terminal post and the connection ring, and a limiting structure is provided on the wall corresponding to the filling space; Upper plastic, the upper plastic fills the filling space, and the upper plastic and the limiting structure form a limit to restrict the relative circumferential rotation of the upper plastic.

2. The terminal post module of the battery according to claim 1, wherein The terminal post module further includes a sealing ring, the sealing ring is pressed between the connection ring and the terminal post, and the filling space is formed between the terminal post, the sealing ring and the connection ring.

3. The terminal post module of the battery according to claim 1, wherein The wall body constitutes the wall body of the connection ring, the limiting structure includes a limiting hole formed on the connection ring, and the upper plastic forms a plastic column, and the plastic column is arranged in the limiting hole.

4. The terminal post module of the battery according to claim 3, wherein An annular groove is formed in the upper plastic, the connection ring is arranged in the annular groove, and the plastic column penetrates through the limiting hole and is connected to opposite sides of the inner wall of the annular groove.

5. The terminal post module of the battery according to claim 3, wherein The wall body also constitutes the wall body of the terminal post, the limiting structure further includes a first anti-torsion structure formed on the side wall of the terminal post, and a second anti-torsion structure is formed on the upper plastic, and the first anti-torsion structure and the second anti-torsion structure cooperate to restrict the circumferential rotation of the upper plastic.

6. The terminal post module of the battery according to claim 5, wherein The first anti-torsion structure includes a cut surface formed on the circumference of the outer wall of the terminal post and a first arc surface protruding outward, the cut surface and the first arc surface are connected end to end, the second anti-torsion structure includes a convex surface formed on the circumference of the upper plastic and a second arc surface recessed inward, the convex surface and the second arc surface are connected end to end, the cut surface is attached to the convex surface, and the first arc surface is attached to the second arc surface.

7. The terminal post module of the battery according to claim 4, wherein A first limiting protrusion is formed on the side wall in the annular groove, the limiting structure further includes a first limiting groove formed on the connection ring, and the first limiting protrusion is arranged in the first limiting groove; and / or A second limiting groove is formed on the side wall in the annular groove, the limiting structure further includes a second limiting protrusion formed on the connection ring, and the second limiting protrusion is arranged in the second limiting groove.

8. The terminal post module of the battery according to claim 4, wherein The connecting ring includes a connecting body and a first bent portion bent inward from the connecting body. The shape formed by the connecting body and the first bent portion is adapted to the annular groove. The pole column includes a base and a pole column boss provided on the base. The connecting body is located on the periphery of the base, and the first bent portion is located on the periphery of the pole column boss. The pole column module further includes a sealing ring, and the sealing ring is pressed between the bottom side of the first bent portion and the top side of the base. The upper plastic is attached to the base and the pole column boss, and the limiting hole is provided on the connecting body.

9. The pole column module of the battery according to claim 8, wherein the connecting body forms a second bent portion bent inward at the other end relative to the first bent portion. The second bent portion is located on the bottom side of the base, and the upper plastic is filled between the second bent portion and the base.

10. The pole column module of the battery according to claim 8 or 9, wherein the connecting body forms a third bent portion bent outward at the other end relative to the first bent portion. The third bent portion is adapted to be fixedly connected to a connecting groove on the bottom side of a through hole of the battery cover.

11. A top cover of a battery, characterized in that, The top cover includes a cover shell and the pole column module according to any one of claims 1 to 10. A through hole is provided on the cover shell, and the connecting ring is fixedly connected to the through hole so that the pole column module is disposed in the through hole.

12. A battery, characterized in that, The battery includes the top cover of the battery according to claim 11.

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