Top cover of battery and battery

Abstract

The utility model relates to the field of batteries, particularly provides a top cover of a battery and the battery, and aims to solve the problem that the weight of the top cover of the existing battery cannot be reduced on the premise of ensuring the structural stability. In order to achieve the purpose, the top cover of the battery comprises a cover shell, a pole and an adapter plate, and a through hole is formed in the cover shell; a weight reduction groove is formed in the bottom of the pole; the switching piece comprises a switching body and a switching boss, the switching body is arranged on the back side of the cover shell, and the switching boss is located in the through hole and connected to the weight reduction groove. The pole does not need to penetrate through the through hole, and the pole can be effectively thinned; and meanwhile, the rigidity of the structure is improved due to the existence of the switching bosses, and the switching bosses are embedded into the through holes and connected with the weight reduction grooves, so that additional support is added in a key stress area, external pressure or impact can be effectively resisted, and the stability of the structure can be improved due to the arrangement mode.

Description

Technical Field

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

[0002] In the field of battery technology, the weight of the battery top cover has an important impact on the overall performance and user experience of the battery. Traditional battery top covers usually use strong and heavy materials to ensure the structural stability and safety. However, this design results in a relatively large weight of the battery top cover. The heavier battery top cover not only increases the overall weight of the battery, but may also occupy more internal space of the battery, thereby reducing the space available for storing energy inside the battery. This not only reduces the energy density of the battery, but may also result in less energy provided by the battery under the same volume.

[0003] Correspondingly, there is a need in the art for a new battery top cover and battery to solve the problem that the existing battery top cover cannot reduce the weight while ensuring the structural stability. Summary of the Utility Model

[0004] This application aims to solve the above technical problems, that is, to solve the problem that the existing battery top cover cannot reduce the weight while ensuring the structural stability.

[0005] In a first aspect, this application provides a battery top cover, characterized in that it includes: a cover shell, on which there are through holes; a pole column, a weight reduction groove is formed at the bottom of the pole column; a connecting piece, the connecting piece includes a connecting body and a connecting boss, the connecting body is arranged on the back side of the cover shell, and the connecting boss is located in the through hole and connected to the weight reduction groove.

[0006] In the battery top cover of this application, a weight reduction groove is formed at the bottom of the pole column, the connecting body is arranged on the back side of the cover shell, and the connecting boss is located in the through hole and connected to the weight reduction groove, so that the pole column does not need to pass through the through hole, and the pole column can be effectively thinned; at the same time, the presence of the connecting boss increases the rigidity of the structure. Since the connecting boss is embedded in the through hole and connected to the weight reduction groove, it is equivalent to adding additional support in the key stress area, which can effectively resist external pressure or impact, prevent the cover shell and the pole column from deforming, and can also reduce the relative displacement between the pole column and the cover shell, preventing component separation caused by vibration or temperature change during use. Therefore, this setting method can also improve the structural stability.

[0007] In an optional technical solution of the above battery top cover, the connecting body includes a relative first surface and a second surface, the connecting boss is formed on the first surface, and a connecting groove is formed at the position corresponding to the connecting boss on the second surface.

[0008] The design of the transition groove can reduce the material usage, thereby effectively reducing the overall weight of the battery top cover and improving the energy density of the battery. The mating structure of the transition groove and the transition boss also has good seismic performance. The groove can effectively absorb and relieve the stress caused by external shocks or vibrations, protecting the internal components of the battery from damage. In addition, this design of the transition piece can be achieved by stamping, simplifying the manufacturing process and reducing the manufacturing cost.

[0009] In the alternative technical solution of the top cover of the above battery, the pole post forms the weight reduction groove by stamping.

[0010] Compared with the turning and milling processes, this setting method makes the production efficiency higher and the process more simplified, and can effectively reduce the manufacturing cost of the pole post. In addition, by forming the weight reduction groove by stamping, the structure of the pole post is more reasonably optimized. It not only reduces the weight of the pole post, but also improves the heat dissipation performance and strength distribution, making the overall performance of the battery better.

[0011] In the alternative technical solution of the top cover of the above battery, the pole post is a laminated metal composite plate.

[0012] Since the metal composite plate allows for a larger bend and permits greater deformation during the stamping process without being prone to fracture or damage, the success rate in stamping is higher. And the laminated design can disperse and withstand greater mechanical stress, reducing the risk of fracture or deformation that may occur in a single-layer material. In addition, it is also convenient to select metals of different materials, ensuring electrical properties while reducing weight.

[0013] In the alternative technical solution of the top cover of the above battery, the metal composite plate is a copper-aluminum composite plate.

[0014] Since aluminum has a lower density, using aluminum as the main material of the pole post can significantly reduce the weight of the pole post. At the same time, the high conductivity of copper ensures the current conduction performance. Through this material combination, the pole post can maintain excellent conductivity and mechanical strength while reducing weight, thus achieving the lightweight design of the battery and improving the energy density and efficiency of the battery.

[0015] In the alternative technical solution of the top cover of the above battery, the transition boss and the weight reduction groove are adapted in shape so that each inner wall of the weight reduction groove fits onto the surface of the transition boss.

[0016] The above setting method can ensure that the inner wall of the weight reduction groove fits perfectly onto the surface of the transition boss, thereby dispersing and evenly transmitting stress, avoiding stress concentration, and achieving a lightweight design while further improving strength and stability. In addition, since a larger contact area is provided, it ensures that current can be conducted efficiently and stably, reducing the contact resistance and enhancing the performance of the battery.

[0017] In an alternative technical solution of the top cover of the above battery, the transfer boss is welded to the weight reduction groove.

[0018] Since the transfer boss is welded to the weight reduction groove, there is no need for additional connecting parts (such as screws or brackets), thus reducing the total weight.

[0019] In an alternative technical solution of the top cover of the above battery, the top cover further includes a packaging component for packaging the pole column and jointly forming a pole column module with the pole column, and the pole column module is fixed in the through hole.

[0020] In the above setting method, on the one hand, during installation, the pole column module formed by the packaging component and the pole column can be fixed in the through hole, thereby enabling modular design of the top cover, making the production efficiency of the battery higher, and at the same time reducing the overall scrap rate of the battery top cover, thus reducing the production cost of the battery and increasing the profit margin. On the other hand, the pole column module design can eliminate redundant parts in the traditional design. By streamlining the structure and reducing unnecessary reinforcement or connecting parts, the weight of the pole column can be effectively reduced. For example, the packaging component and the pole column as an integral pole column module can reduce the separate reinforcement links in the traditional design. Thereby, the weight of the top cover can be further reduced.

[0021] In an alternative technical solution of the top cover of the above battery, the packaging component includes an upper plastic, a sealing ring, and a connecting ring. The connecting ring is sleeved outside the pole column, the sealing ring is pressed between the connecting ring and the pole column, a filling space is formed between the pole column, the connecting ring, and the sealing ring, the upper plastic is filled in the filling space, and the connecting ring is connected to the through hole.

[0022] This setting method can avoid using additional reinforcement parts and connecting parts, reducing the use of overall materials. Among them, lightweight materials such as plastic and high-efficiency sealing rings can be used to significantly reduce the overall weight while ensuring strength and sealing performance. In addition, this integrated design makes the components more compact, reducing the redundant structure and space waste that may exist in the traditional design, thereby further reducing the weight.

[0023] In an alternative technical solution of the top cover of the above battery, the connecting ring includes a connecting body and a first bending part bent inward from the connecting body. An annular groove is formed in the upper plastic, and the shape formed by the connecting body and the first bending part is adapted to the annular groove. The pole column includes a base and a pole column boss provided on the base. The first bending part is located above the base, and the upper plastic is in contact with the pole column boss and the base.

[0024] Since the first bent portion of the connecting ring is located above the pole base, the pole can be effectively fixed by the inner bending design, and the annular groove in the upper plastic is adapted to the shape of the connecting body and the first bent portion, providing double fixation and significantly enhancing the ability of the pole to prevent it from falling out.

[0025] In an optional technical solution of the top cover of the above-mentioned battery, the connecting ring also includes a second bending portion, the second bending portion is formed on the inner side of the other end of the connecting body relative to the first bending portion, the second bending portion is located below the base, and the sealing ring is pressed between the second bending portion and the base.

[0026] The above arrangement enables the pole base to be clamped up and down, forming a double lock up and down, greatly enhancing the stability of the pole. It can also effectively disperse the stress on the pole, avoid stress concentration in one position, and reduce the risk of damage to the pole. In addition, it can also effectively compress the sealing ring between the second bend and the base to prevent any leakage or contaminants from entering.

[0027] In an optional technical solution of the top cover of the above-mentioned battery, the connecting ring also includes a third bending portion, the third bending portion is formed on the outer side of the other end of the connecting body relative to the first bending portion, and a connecting groove is provided on the bottom side of the through hole, and the third bending portion is connected to the connecting groove.

[0028] The above arrangement can effectively fix the pole module in the through hole, enhancing the stability of the structure. And because the bottom side of the through hole of the battery cover is provided with a connecting groove, the third bent portion is fixedly connected to the connecting groove, which can prevent the pole module from falling out of the through hole.

[0029] In an optional technical solution of the top cover of the above-mentioned battery, a tangent surface and a first curved surface protruding outward are formed on the circumference of the outer wall of the pole, and the tangent surface is connected to the first curved surface end to end, and a convex surface and a second curved surface concave inward are formed on the circumference of the upper plastic, and the convex surface is connected to the second curved surface end to end, the tangent surface is in contact with the convex surface, and the first curved surface is in contact with the second curved surface.

[0030] The above arrangement can ensure that the relative position between the upper plastic and the pole is fixed, making the structure more stable, and making the stress distribution between the upper plastic and the pole more uniform, reducing material fatigue and structural damage, and extending the service life of the product.

[0031] In an optional technical solution of the top cover of the above-mentioned battery, a first limiting protrusion is formed on the side wall within the annular groove, a first limiting groove is formed on the connecting ring, and the first limiting protrusion is arranged in the first limiting groove; or a second limiting groove is formed on the side wall within the annular groove, a second limiting protrusion is formed on the connecting ring, and the second limiting protrusion is arranged in the second limiting groove.

[0032] The above-mentioned setting method can further improve the relative stability of the upper plastic and the connecting ring, and through the multi-point limit design, effectively distribute the stress evenly in different parts of the module, greatly improving the deformation resistance and durability of the component, so that the integrity of the structure can be maintained under various stress conditions, ensuring safety of use.

[0033] In an optional technical solution of the top cover of the above-mentioned battery, the top cover also includes a lower plastic, which is arranged between the adapter body and the cover shell, and the lower plastic is provided with a receiving hole extending in the direction away from the adapter body, the receiving hole is arranged in the ring of the connecting ring, and the adapter boss is arranged in the receiving hole.

[0034] Since the accommodating hole is arranged between the connecting ring and the adapter boss, it can prevent the adapter plate from contacting the connecting ring, effectively prevent the occurrence of electrical short circuit, and improve the safety and reliability of the battery, especially in a high-load working environment.

[0035] On the other hand, the present application also provides a battery, which includes the top cover of the battery described in any of the above embodiments.

[0036] After the battery has the above-mentioned top cover, the overall weight can be reduced, the energy density can be improved, and the stability of the overall structure can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, in which:

[0038] Figure 1 is a cross-sectional view of one end of the top cover of the present application;

[0039] Figure 2 It is a schematic diagram of the structure of the pole of the present application;

[0040] Figure 3 is a cross-sectional view of a pole of the present application;

[0041] Figure 4 It is a structural schematic diagram of the connection ring of the present application;

[0042] Figure 5 is a cross-sectional view of the connecting ring of the present application;

[0043] Figure 6 It is a schematic structural diagram of the upper plastic of this application;

[0044] Figure 7 It is a schematic structural diagram of the cover shell of this application;

[0045] Figure 8 It is a schematic structural diagram of the adapter piece of this application;

[0046] Figure 9 It is a schematic structural diagram of the lower plastic of this application;

[0047] Figure 10 It is a bottom view of one end of the top cover of this application.

[0048] Explanation of reference numerals in the drawings:

[0049] 1 - pole column; 11 - base; 111 - cutting 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 - first limiting groove; 22 - first bending part; 23 - second bending part; 24 - third bending part; 3 - upper plastic; 31 - inner ring body; 311 - protruding surface; 312 - second arc surface; 313 - first limiting protrusion; 32 - outer ring body; 33 - connecting body; 34 - annular groove; 4 - cover shell; 41 - through hole; 42 - connecting groove; 5 - adapter piece; 51 - adapter body; 52 - adapter boss; 53 - adapter groove; 54 - first surface; 55 - second surface; 6 - lower plastic; 61 - accommodating hole; 7 - sealing ring. Detailed implementation manners

[0050] 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.

[0051] 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.

[0052] 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, and "lower" and "bottom" refer to the direction close to the battery cell in the thickness direction of the cover shell.

[0053] This application provides a battery, preferably a square lithium-ion battery. The battery includes a top cover, as Figures 1 to 10As shown in the figure, the top cover includes a cover shell 4, a terminal post 1 and a connecting piece 5. The cover shell 4 can be a polished aluminum sheet. A through hole 41 is provided on the cover shell 4. A weight-reducing groove 15 is formed at the bottom of the terminal post 1. The connecting piece 5 includes a connecting body 51 and a connecting boss 52. The connecting body 51 includes an opposite first surface 54 and a second surface 55. The connecting boss 52 is formed on the first surface 54. The connecting body 51 is arranged on the back side of the cover shell 4. The connecting 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. The connecting boss 52 can be located at the middle position of the connecting body 51. It can be understood that the first surface 54 and the second surface 55 refer to the two opposite surfaces in the thickness direction of the connecting body 51, that is, the front and back surfaces of the connecting body 51. Among them, the front surface of the connecting body 51 faces the cover shell, and the back surface of the connecting body 51 faces away from the cover shell.

[0054] 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 connecting piece needs to be fixed on the back side of the cover shell. Therefore, in order to connect the terminal post and the connecting piece, the terminal post will pass through the through hole on the cover shell and be connected to the connecting 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. The connecting body 51 is arranged on the back side of the cover shell 4, and the connecting 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 existence of the connecting boss 52 increases the rigidity of the structure. Since the connecting 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-bearing 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.

[0055] As a possible implementation manner, a connecting groove 53 is formed at the position of the second surface 55 corresponding to the connecting boss 52. The design of the connecting groove 53 can reduce the material usage, thereby effectively reducing the overall weight of the top cover and improving the energy density of the battery. The matching structure of the connecting groove 53 and the connecting boss 52 also has good seismic performance. The groove can effectively absorb and relieve the stress brought by external impact or vibration, protecting the internal components of the battery from damage. In addition, this design of the connecting piece 5 can be realized by stamping, simplifying the manufacturing process and reducing the manufacturing cost.

[0056] As a possible implementation, the pole 1 is formed with the weight-reducing groove 15 by stamping. Compared with the turning and milling process, this setting method makes the production efficiency higher and the process simpler, 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, which not only reduces the weight of the pole 1, but also improves the heat dissipation performance and strength distribution, so that the overall performance of the battery is better.

[0057] As a possible implementation method, refer to Figure 3 , the pole 1 is a stacked metal composite plate. Since the metal composite plate can allow for larger bending and greater deformation during the stamping process, and is not prone to breakage or damage, the success rate in stamping is higher. Furthermore, the metal composite plate is a copper-aluminum composite plate. In this case, the copper block 13 can be fixedly connected under the aluminum block 14, and the pole 1 can be a negative pole 1. 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 weight, thereby realizing a lightweight design of the battery and improving the energy density and efficiency of the battery.

[0058] As a possible implementation, the shape of the transfer boss 52 is adapted to the weight-reducing groove 15 so that the inner walls of the weight-reducing groove 15 are all fitted to the surface of the transfer boss 52. For example, the weight-reducing groove 15 includes a first bottom wall and a first side wall and a second side wall arranged on opposite sides of the first bottom wall, then the transfer boss 52 also includes a second bottom wall and a third side wall and a fourth side wall arranged on opposite sides of the second bottom wall, the first bottom wall is fitted to the second bottom wall, the first side wall is fitted to the third side wall, and the second side wall is fitted to the fourth side wall. It should be noted that the shape of the above-mentioned groove is only a preferred implementation, and its setting method can be adjusted. For example, the weight-reducing groove 15 and the transfer groove 53 can both be designed to be arc-shaped, etc. These adjustments do not deviate from the principles of the present application and are within the protection scope of the present application.

[0059] The above arrangement can ensure that the inner wall of the weight-reducing groove 15 is completely in contact with the surface of the transfer boss 52, thereby dispersing and evenly transmitting stress and avoiding stress concentration, thereby achieving a lightweight design while further improving strength and stability. In addition, since a larger contact area can be provided, the current can be efficiently and stably conducted, the contact resistance is reduced, and the performance of the battery is improved.

[0060] As a possible implementation, the transfer boss 52 is welded to the weight-reducing groove 15. Since the transfer boss 52 is welded to the weight-reducing groove 15, no additional connecting parts (such as screws or brackets) are required, thereby reducing the total weight. Figure 8, a first connecting arm and a second connecting arm can be provided on the transfer body 51. The first connecting arm and the second connecting arm can be provided on the same side and are used to be fixedly connected to the tabs of the bare battery cell respectively.

[0061] As a possible implementation manner, the top cover further includes a packaging component, which is used to package the pole column 1 and together with the pole column 1 form a pole column module, and the pole column module is fixed in the through hole 41.

[0062] In the above setting manner, on the one hand, during installation, the pole column module formed by the packaging component and the pole column 1 can be fixed in the through hole 41, so as to perform modular design on the top cover, making the production efficiency of the battery higher. At the same time, the overall scrap rate of the battery top cover is reduced, thereby reducing the production cost of the battery and increasing the profit margin. On the other hand, the pole column module design can eliminate the redundant parts in the traditional design. By streamlining the structure and reducing unnecessary reinforcement or connecting parts, the weight of the pole column 1 can be effectively reduced. For example, the packaging component and the pole column 1 as a whole pole column module can reduce the separate reinforcement links in the traditional design. Thereby, the weight of the top cover can be further reduced.

[0063] As a possible implementation manner, the packaging component includes an upper plastic 3, a sealing ring 7 and a connecting ring 2. The connecting ring 2 is 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, the upper plastic 3 is filled in the filling space, and the connecting ring 2 is connected to the through hole 41. The sealing ring 7 is preferably a hollow ring, so as to be convenient for compression and fitting to prevent the electrolyte inside the battery from overflowing.

[0064] This setting manner can avoid using additional reinforcement parts and connecting parts, reducing the use of overall materials. Among them, lightweight materials such as plastics and efficient sealing rings 7 can be used, which can significantly reduce the overall weight while ensuring strength and sealing performance. In addition, this integrated design makes the components more compact, reducing the redundant structure and space waste that may exist in the traditional design, thereby further reducing the weight.

[0065] As a possible implementation manner, referring to Figure 1 , Figure 4 and Figure 5 , the connecting ring 2 includes a connecting body 21 and a first bending part 22 bent inward from the connecting body 21, and the bending angle of the first bending part 22 can be 45° - 90°; referring to Figure 1 and Figure 6, an annular groove 34 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 34, the pole 1 includes a base 11 and a pole boss 12 provided on the base 11, the first bent portion 22 is located above the base 11 to prevent the pole 1 from escaping through the through hole 41, and the upper plastic 3 fits the pole boss 12 and the base 11. Further, a top boss can be provided on the top surface of the pole boss 12. It can be understood that, in the case where the pole 1 includes the base 11 and the pole boss 12, the weight reduction groove 15 is formed at the bottom of the base 11.

[0066] Since the first bent portion 22 of the connecting ring 2 is located above the base 11 of the pole 1, the pole 1 can be effectively fixed by the inner bending design, and the annular groove 34 in the upper plastic 3 is adapted to the shape of the connecting body 21 and the first bent portion 22, providing double fixation and significantly enhancing the anti-fallout capability of the pole 1.

[0067] Possibly, the upper plastic 3 includes an inner ring body 31, an outer ring body 32 and a connecting body 33, the ends of the outer ring body 32 and the inner ring body 31 on the same side are bent inward, the connecting body 33 is connected to the two ends, the above-mentioned annular groove 34 is formed between the inner ring body 31, the outer ring body 32 and the connecting body 33, the surface of the inner ring body 31 away from the outer ring body 32 in the thickness direction is in contact with the side and top surfaces of the base 11, the surface of the inner ring body 31 close to the outer ring body 32 in the thickness direction is in contact with the connecting ring 2, the surface of the outer ring body 32 close to the inner ring body 31 in the thickness direction is in contact with the connecting ring 2, and the connecting body 33 is in contact with the cylindrical surface of the pole boss 12.

[0068] As a possible embodiment, the connecting ring 2 also includes a second bending portion 23, which is formed on the inner side of the other end of the connecting body 21 relative to the first bending portion 22, and the second bending portion 23 is located below the base 11, and the sealing ring 7 is pressed between the second bending portion 23 and the base 11.

[0069] The above arrangement enables the base 11 of the pole 1 to be clamped up and down, forming a double locking up and down, which greatly enhances the stability of the pole 1. It can also effectively disperse the stress on the pole 1, avoid stress concentration in one position, and reduce the risk of damage to the pole 1. In addition, it can also effectively compress the sealing ring 7 between the second bent portion 23 and the base 11 to prevent any leakage or contaminants from entering.

[0070] As a possible implementation, the connecting ring 2 further includes a third bending portion 24 formed on the outer side of the other end of the connecting body 21 relative to the first bending portion 22. A connecting groove 42 is provided at the bottom side of the through hole 41, and the third bending portion 24 is connected to the connecting groove 42, for example, by welding connection, but this is not restrictive. As long as the fixed connection between the third bending portion 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 portion 24 can be attached to the side surface of the connecting groove 42, and the upper surface of the third bending portion 24 can be attached to the upper end surface of the connecting groove 42. In addition, the lower end surface of the outer ring body 32 can be attached to the remaining upper surface of the third bending portion 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 shell 4 to facilitate installation.

[0071] With the above setting method, the pole column module can be effectively fixed in the through hole 41, enhancing the structural stability. And since the connecting groove 42 is provided at the bottom side of the through hole 41 of the battery cover shell 4 and the third bending portion 24 is fixedly connected to the connecting groove 42, the pole column module can be prevented from coming out of the through hole 41.

[0072] During the injection molding process, first press the sealing ring 7 between the second bending portion 23 and the base 11, and then place the sealing ring 7, the pole column 1 and the connecting ring 2 into the injection mold for injection molding. After the plastic material is cured, it can wrap the connecting ring 2 and form a combination including the pole column 1, the sealing ring 7, the upper plastic 3 and the connecting ring 2. Then, their combination can be fixed to the connecting groove 42 of the cover shell 4 by welding, thus completing the assembly of the main structural components of the battery top cover. This makes the production efficiency of the battery higher, and at the same time reduces the overall scrap rate of the battery top cover, thereby reducing the production cost of the battery and increasing the profit margin.

[0073] As a possible implementation, referring to Figure 2 , a cut surface 111 and an outwardly protruding first arc surface 112 are formed on the outer wall circumference of the pole column 1, and the cut surface 111 and the first arc surface 112 are connected end to end. Referring to Figure 6 , a protruding surface 311 and an inwardly concave second arc surface 312 are formed on the circumference of the upper plastic 3, and the protruding surface 311 and the second arc surface 312 are connected end to end. The cut surface 111 is attached to the protruding surface 311, and the first arc surface 112 is attached to the second arc surface 312.

[0074] With the above setting method, the relative position between the upper plastic 3 and the pole column 1 can be ensured to be fixed, preventing relative rotation between the pole column 1 and the upper plastic 3, making the structure more stable. And it makes the stress distribution between the upper plastic 3 and the pole column 1 more uniform, reducing material fatigue and structural damage, and extending the service life of the product.

[0075] Preferably, the cutting surface 111 and the first arc surface 112 are formed on the outer periphery of the base 11. The outer periphery of the base 11 can be generally circular. A cutting surface 111 is provided at intervals of the first arc surface 112 in the circumferential direction of the circle. The numbers of both the cutting surface 111 and the first arc surface 112 are greater than 1. The above-mentioned convex surface 311 and the second arc surface 312 can be provided on the surface of the inner ring body 31 of the upper plastic 3 away from the outer ring body 32 in the thickness direction. Preferably, the numbers of both the convex surface 311 and the second arc surface 312 segments are greater than 1. Each cutting 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 achieve a multi-point fitting design, make the structure more uniform when stressed, reduce local stress concentration, and further improve stability.

[0076] As a possible implementation manner, a first limiting protrusion 313 is formed on the side wall in the annular groove 34, and a first limiting groove 211 is formed on the connecting ring 2. The first limiting protrusion 313 is arranged in the first limiting groove 211. 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 211 is arranged on the inner surface of the connecting body 21. The first limiting protrusion 313 and the first limiting groove 211 cooperate to further improve the relative stability between the upper plastic 3 and the connecting ring 2 and prevent relative rotation between the upper plastic 3 and the connecting ring 2. It should be noted that the setting positions of the above-mentioned first limiting protrusion 313 and the first limiting groove 211 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 211 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.

[0077] As a possible implementation manner, a second limiting groove is formed on the side wall in the annular groove 34, and a second limiting protrusion is formed on the connecting ring 2. The second limiting protrusion is arranged 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 and the second limiting protrusion cooperate to further improve the relative stability between the upper plastic 3 and the connecting ring 2 and prevent relative rotation between the upper plastic 3 and the connecting ring 2. It should be noted that the setting positions of the above-mentioned second limiting groove and the 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.

[0078] In summary, the above-mentioned setting method can further improve the relative stability of the upper plastic 3 and the connecting ring 2, and through the multi-point limit design, effectively distribute the stress evenly in different parts of the module, greatly improving the deformation resistance and durability of the component, so that the integrity of the structure can be maintained under various stress conditions, ensuring safety of use.

[0079] As a possible implementation method, refer to Figure 1 and Figure 9 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. Since the receiving hole 61 is disposed between the connecting ring 2 and the connecting boss 52, the connecting piece 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.

[0080] 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.

[0081] It should be noted that the specific implementation method of the upper plastic 3 fixing the relative position of the pole 1 and the connecting ring 2 is not fixed, and its setting method can be adjusted. For example, fixing grooves are formed on the side walls of the pole 1 and the connecting ring 2, and fixing columns are formed on the opposite sides of the upper plastic 3, such as the inner ring body 31, and the fixing columns on both sides are respectively fixed in the fixing grooves of the pole 1 and the connecting ring 2, etc. These adjustments do not deviate from the principles of the present application and are within the protection scope of the present application.

[0082] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying 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 principles 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 fall within the protection scope of the present application.

Claims

1. A top cover of a battery, characterized in that, Comprising: A cover shell, on which a through hole is provided; A pole post, with a weight-reducing groove formed at the bottom of the pole post; A transition piece, which includes a transition body and a transition boss. The transition body is arranged on the back side of the cover shell, and the transition boss is located in the through hole and connected to the weight-reducing groove.

2. The top cover of the battery according to claim 1, characterized in that The transition body includes an opposite first surface and a second surface. The transition boss is formed on the first surface, and a transition groove is formed at the position corresponding to the transition boss on the second surface.

3. The top cover of the battery according to claim 2, characterized in that The pole post is a laminated metal composite plate.

4. The top cover of the battery according to claim 3, characterized in that The metal composite plate is a copper-aluminum composite plate.

5. The top cover of the battery according to claim 1, characterized in that The shape of the transition boss is adapted to the weight-reducing groove, so that each inner wall of the weight-reducing groove is attached to the surface of the transition boss.

6. The top cover of the battery according to claim 1, characterized in that The top cover further includes a packaging component, which is used to package the pole post and jointly form a pole post module with the pole post. The pole post module is fixed in the through hole.

7. The top cover of the battery according to claim 6, characterized in that The packaging component includes an upper plastic, a sealing ring and a connecting ring. The connecting ring is sleeved outside the pole post, the sealing ring is pressed between the connecting ring and the pole post, a filling space is formed between the pole post, the connecting ring and the sealing ring, the upper plastic is filled in the filling space, and the connecting ring is connected to the through hole.

8. The top cover of the battery according to claim 7, characterized in that The connecting ring includes a connecting body and a first bending part bent inward from the connecting body. An annular groove is formed in the upper plastic. The shape formed by the connecting body and the first bending part is adapted to the annular groove. The pole post includes a base and a pole post boss arranged on the base. The first bending part is located above the base, and the upper plastic is attached to the pole post boss and the base.

9. The top cover of the battery according to claim 8, characterized in that The connecting ring further includes a second bending part, which is formed on the inner side of the other end of the connecting body relative to the first bending part. The second bending part is located below the base, and the sealing ring is pressed between the second bending part and the base; and / or The connecting ring further includes a third bending part, which is formed on the outer side of the other end of the connecting body relative to the first bending part. A connecting groove is provided at the bottom side of the through hole, and the third bending part is connected in the connecting groove.

10. The top cover of the battery according to claim 7, characterized in that A tangent surface and a first arc surface protruding outward are formed on the circumference of the outer wall of the pole, and the tangent surface is connected to the first arc surface end to end. A convex surface and a second arc surface concave inward are formed on the circumference of the upper plastic, and the convex surface is connected to the second arc surface end to end. The tangent surface is fitted with the convex surface, and the first arc surface is fitted with the second arc surface.

11. The top cover of the battery according to claim 8, characterized in that: A first limiting protrusion is formed on the side wall of the annular groove, a first limiting groove is formed on the connecting ring, and the first limiting protrusion is arranged in the first limiting groove; or A second limiting groove is formed on the side wall in the annular groove, a second limiting protrusion is formed on the connecting ring, and the second limiting protrusion is arranged in the second limiting groove.

12. The top cover of a battery according to any one of claims 7 to 11, characterized in that: The top cover also includes a lower plastic, which is arranged between the adapter body and the cover shell. The lower plastic is provided with a receiving hole extending in the direction away from the adapter body. The receiving hole is arranged in the ring of the connecting ring, and the adapter boss is arranged in the receiving hole.

13. A battery, characterized in that, The battery comprises the top cover of the battery according to any one of claims 1 to 12.

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