Stainless steel lithium battery cover plate and battery

Abstract

The utility model belongs to the technical field of lithium batteries, and discloses a stainless steel lithium battery cover plate and a battery. The battery cover plate comprises a top cover plate and a pole assembly, wherein a pole through hole is formed in the top cover plate; the pole assembly is installed in the pole via hole, the pole assembly comprises a fixing lantern ring and a pole terminal, the fixing lantern ring comprises a supporting part and a crimping part, the surface of the supporting part protrudes upwards to form the crimping part, the supporting part is fixedly arranged at an opening of the pole via hole, and a receding hole communicated with the pole via hole is formed in the bottom of the supporting part in a penetrating mode. The pole terminal penetrates through the avoiding hole and the pole through hole and is lapped on the supporting part; and a part of the crimping part is in a bent state and is crimped on the top surface of the pole terminal, so that the pole terminal is clamped between the crimping part and the supporting part. Through the arrangement, the working procedure steps of riveting the pole on the top cover sheet and then fixedly connecting the pole with the riveting aluminum block through laser welding are omitted, the internal resistance of the pole terminal is reduced, and the use reliability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field especially relates to a stainless steel lithium battery cover plate and battery. BACKGROUND

[0002] In the field of power battery, lithium battery has the advantages of high voltage, long service life, high energy density, light and small, and is widely used in many fields. However, its safety performance is poor. When the lithium battery is overcharged, the internal electrolyte and other materials will crack and produce gas, causing the battery shell to swell and rupture, allowing external oxygen gas to enter the battery interior and react with the lithium ions accumulated on the negative electrode surface, thereby causing an explosion.

[0003] The existing battery shell is usually made of aluminum, which has lower structural strength than the stainless steel battery cover plate, and poor corrosion resistance and high temperature resistance. Therefore, the stainless steel battery cover plate has gradually become a better choice. However, due to the material characteristics of stainless steel, it is difficult to form. The commonly used stainless steel battery cover plate has a single structure and is riveted. In addition, the pole also needs to be laser welded with the riveted aluminum block for fixed connection, which results in large internal resistance of the pole and affects the performance of the battery.

[0004] Therefore, there is an urgent need for a stainless steel lithium battery cover plate and battery to solve the problems in the prior art. SUMMARY

[0005] The first purpose of the utility model is to provide a stainless steel lithium battery cover plate that can ensure the stability of the installation with the pole assembly and improve the technical problems of large internal resistance of the pole and low performance of the battery in the prior art.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The stainless steel lithium battery cover plate comprises a top cover sheet, a pole through hole is formed in the top cover sheet, a pole assembly is installed in the pole through hole, the pole assembly comprises a fixed sleeve ring and a pole terminal, the fixed sleeve ring comprises a support part and a pressure contact part, the surface of the support part is upwardly protrudingly provided with the pressure contact part, the support part is fixedly arranged at the opening of the pole through hole, a clearance hole is formed in the bottom of the support part and is in communication with the pole through hole, the pole terminal is arranged in the clearance hole and the pole through hole and is lapped on the support part, and part of the pressure contact part is in a bent state and is pressure contacted with the top surface of the pole terminal to clamp the pole terminal between the pressure contact part and the support part.

[0008] As preferred, the fixing ring further comprises a buckling part, the surface of the supporting part is provided with the buckling part downwardly, the buckling part is arranged in the pole post through hole, and part of the buckling part is in a bent state and is press-fitted on the lower surface of the top cover sheet.

[0009] As preferred, part of the buckling part is fixedly connected with the lower surface of the top cover sheet by laser welding.

[0010] As preferred, part of the buckling part is fixedly connected with the lower surface of the top cover sheet by laser welding.

[0011] As preferred, the pole post terminal comprises a post body and an annular flange, the annular flange is protruded on the outer wall surface of the post body, the post body is arranged in the pole post through hole and the avoiding hole, the annular flange is overlapped with the supporting part, and part of the press-fitting part is press-fitted on the annular flange.

[0012] As preferred, the pole post assembly further comprises a sealing ring, the sealing ring is clamped between the fixing ring and the pole post terminal.

[0013] As preferred, the sealing ring comprises a horizontal ring and a vertical ring, the horizontal ring and the vertical ring form a stepped annular structure, the horizontal ring of the sealing ring is clamped and sealed between the annular flange and the supporting part, and the vertical ring of the sealing ring is clamped and sealed between the post body and the buckling part.

[0014] As preferred, the pole post assembly further comprises an injection molding part, the injection molding part is located between the fixing ring and the pole post terminal.

[0015] The injection molding part is wrapped on the pole post terminal, or the injection molding part is integrally formed with the pole post terminal by injection molding.

[0016] As preferred, the stainless steel lithium battery cover plate further comprises a lower plastic, the lower plastic is arranged on the side of the top cover sheet abutting against the battery shell.

[0017] The beneficial effect of the stainless steel lithium battery cover plate is that the crimping part of the fixing ring is buckled and crimped on the top surface of the pole terminal, the pole terminal is sealed, and the pole terminal is clamped between the crimping part and the supporting part firmly.

[0018] The second purpose of the utility model is to provide a battery, which can improve the use performance and use safety reliability.

[0019] To achieve the purpose, the utility model adopts the following technical scheme:

[0020] The battery comprises a battery shell, a conductive inner core and the stainless steel lithium battery cover plate, the inside of the battery shell is used for accommodating the conductive inner core, and the stainless steel lithium battery cover plate sealing cover is arranged on the battery shell to package the conductive inner core.

[0021] The battery provided by the utility model has the beneficial effect that:

[0022] By using the stainless steel lithium battery cover plate in the battery, the battery assembly process is simpler, the assembly process of welding the pole terminal and the top cover piece is not needed, the pole terminal can be stably installed on the top cover piece only by the mechanical fixation of the fixing ring on the pole terminal, thereby avoiding the influence of welding on the internal resistance of the pole terminal, and further ensuring the good conductive performance of the battery and improving the use safety reliability of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the structural schematic diagram of the stainless steel lithium battery cover plate provided by the utility model embodiment;

[0024] Figure 2 is the structural explosion diagram of the stainless steel lithium battery cover plate provided by the utility model embodiment;

[0025] Figure 3 is the top view of the stainless steel lithium battery cover plate provided by the utility model embodiment;

[0026] Figure 4 is the sectional view along the A-A place in the figure; Figure 3

[0027] Figure 5 is the local enlarged view of the B place. Figure 4

[0028] In the figure: ​​

[0029] 1, top cover sheet; 111, first via hole; 112, second via hole; 12, limiting convex ring; 13, liquid injection hole; 14, anti-explosion valve assembly;

[0030] 2, pole assembly; 21, fixed collar; 211, support part; 212, pressure contact part; 213, buckling part; 2201, column body; 2202, annular flange; 221, positive pole terminal; 222, negative pole terminal; 23, sealing ring; 231, horizontal part; 232, vertical part; 24, injection molding part;

[0031] 3, lower plastic; 31, lower plastic through hole; 32, liquid injection through hole; 33, anti-explosion sheet air hole. DETAILED DESCRIPTION

[0032] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0033] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of the embodiments, the terms "upper", "lower", "right", "left" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0036] The technical scheme of the utility model will be further illustrated below by specific embodiments in conjunction with the drawings.

[0037] In one specific embodiment, the utility model provides a stainless steel lithium battery cover plate, in combination Figures 1 to 5 As shown in the figure, the stainless steel lithium battery cover plate comprises a top cover sheet 1 and a pole post assembly 2, wherein the top cover sheet 1 is provided with a pole post via hole; the pole post assembly 2 is installed in the pole post via hole, the pole post assembly 2 comprises a fixed collar 21 and a pole post terminal, the fixed collar 21 comprises a supporting part 211 and a crimping part 212, the surface of the supporting part 211 is upwardly provided with the crimping part 212, the supporting part 211 is fixedly arranged at the opening of the pole post via hole, and a clearance hole communicating with the pole post via hole is formed through the bottom of the supporting part 211, the pole post terminal is arranged in the clearance hole and the pole post via hole and is lapped on the supporting part 211; part of the crimping part 212 is in a bent state and is crimped on the top surface of the pole post terminal to press the pole post terminal between the crimping part 212 and the supporting part 211.

[0038] The utility model fixes the fixed collar 21 at the opening of the pole post via hole, then arranges the pole post terminal through the clearance hole and the pole post via hole and lapped on the supporting part 211, so that the pole post terminal is installed with the fixed collar 21, after installation, the crimping part 212 is rotated and pressed, so that the crimping part 212 can be bent towards the direction close to the pole post terminal, and finally the crimping part 212 is buckled and crimped on the top surface of the pole post terminal, so that the pole post terminal is sealed and firmly clamped between the crimping part 212 and the supporting part 211. At this time, the upper and lower surfaces of the pole post terminal can be connected with the electric equipment outside the battery and the tab group inside the battery respectively, which saves the process steps of riveting the pole post on the top cover sheet 1 and then fixedly connecting through laser welding and riveting aluminum block, not only can greatly reduce the internal resistance of the pole post terminal, but also guarantees the stable reliability of the pole post terminal after installation.

[0039] Specifically, one embodiment of the present embodiment is that two pole post through holes are formed on the top cover sheet 1, which are respectively a first through hole 111 and a second through hole 112, and the first through hole 111 and the second through hole 112 are respectively arranged on opposite sides of the top cover sheet 1; the pole post terminal includes a positive pole post terminal 221 and a negative pole post terminal 222, the positive pole post terminal 221 is arranged in the first through hole 111, and the negative pole post terminal 222 is arranged in the second through hole 112. It should be noted that in the present embodiment, the structures of the parts of the top cover sheet 1 located at the two pole post through holes are the same, and the only difference is that the negative pole post terminal 222 includes a copper column and an aluminum column fixedly connected together, and the positive pole post terminal 221 only adopts an aluminum column. The difference in structure between the positive pole post terminal 221 and the negative pole post terminal 222 does not affect the introduction of the top cover sheet 1 and the pole post terminal in the present embodiment. In order to facilitate description, the structure of the stainless steel lithium battery cover plate will be specifically described below by taking the components near the positive pole post terminal 221 as an example.

[0040] Reference Figure 5 As shown in the drawings, in the present embodiment, the fixing ring 21 further includes a buckling portion 213, the buckling portion 213 is arranged to extend downward from the inner side edge of the lower surface of the supporting portion 211, and the pressing portion 212 is arranged to extend upward from the outer side edge of the upper surface of the supporting portion 211, so that the vertical section of the fixing ring 21 is in a Z-shaped structure. Among them, when the supporting portion 211 is arranged at the opening of the pole post through hole, the buckling portion 213 is arranged to pass through the pole post through hole downward, and when the pressing portion 212 is bent and pressed on the upper surface of the pole post terminal, the buckling portion 213 is rotated in the same way, so that part of the buckling portion 213 can be folded towards the direction of the lower surface of the top cover sheet 1, and then pressed on the lower surface of the top cover sheet 1.

[0041] In the above arrangement, the buckling portion 213 is arranged to fixedly connect the fixing ring 21 and the top cover sheet 1 by mechanical connection, and the connection is stable and strong, which can prevent the fixing ring 21 from being displaced or loosened due to vibration, pressure or other external factors, and the installation process is simple and reliable.

[0042] Further, in the present embodiment, part of the buckling portion 213 is fixedly connected with the lower surface of the top cover sheet 1 by laser welding, so that the fixing ring 21 and the top cover sheet 1 can be more firmly combined.

[0043] Specifically, in the embodiment, the pole post terminal includes a post body 2201 and an annular flange 2202, the post body 2201 is in a cylindrical shape, and the annular flange 2202 is arranged on the outer side wall surface of the post body 2201 in a circumferential direction. Wherein, one end of the post body 2201 away from the annular flange 2202 penetrates through the pole post via hole and the avoidance hole, so that the annular flange 2202 is overlapped on the support part 211, and the length of the post body 2201 is usually determined according to the size of the pole post via hole and the avoidance hole, and the embodiment is not limited thereto, as long as the pole post terminal can be smoothly installed. In addition, the arrangement of the annular flange 2202 can ensure the positional accuracy of the post body 2201 during installation, prevent the post body 2201 from being misaligned or falling from the pole post via hole, and thus can provide reliable support for the post body 2201.

[0044] Optionally, in the embodiment, the pole post assembly 2 further includes a sealing ring 23, which is clamped between the fixed collar 21 and the pole post terminal, and can ensure the air tightness between the fixed collar 21 and the pole post terminal, prevent external impurities from entering the battery interior through the gap between the two, or prevent internal liquid and gas from leaking to the external environment through the gap, thereby improving the durability and reliability of the battery cover plate.

[0045] Specifically, one of the embodiments of the embodiment is that the sealing ring 23 includes a horizontal part 231 and a vertical part 232, the horizontal part 231 is located at the top end of the vertical part 232, and the horizontal part 231 and the vertical part 232 are both annular, so that the horizontal part 231 and the vertical part 232 can form a stepped annular structure after being connected. Wherein, the horizontal part 231 of the sealing ring 23 is clamped and sealed between the annular flange 2202 and the support part 211, and the vertical part 232 of the sealing ring 23 is clamped between the post body 2201 and the buckling part 213, so as to realize the sealing purpose between the pole post terminal and the fixed collar 21 through the sealing ring 23.

[0046] The cross section of the sealing ring 23 in the utility model is L-shaped, the horizontal part 231 is extruded between the annular flange 2202 and the support part 211, and the vertical part 232 is extruded between the post body 2201 and the buckling part 213, that is, during the process of pressing down the sealing ring 23 of the pole post terminal, the vertical part 232 and the horizontal part 231 of the sealing ring 23 are both extruded to a certain extent, so as to achieve the sealing effect. It can be understood that during the actual assembly process, the pressing distance of the pole post to the sealing ring 23 can be adjusted, that is, the deformation degree of the horizontal part 231 is adjusted to meet the sealing requirement of the actual production process.

[0047] Optionally, in the embodiment, the part of the top cover sheet 1 at the opening of the pole post via hole is upwardly protruding and forms a limiting convex ring 12, the supporting part 211 is buckled on the limiting convex ring 12, and the part of the buckling part 213 is bent and buckled on the bottom of the limiting convex ring 12, so that the part of the buckling part 213 can be embedded in the limiting groove at the bottom of the limiting convex ring 12, which can avoid the buckling part 213 protruding from the lower surface of the top cover sheet 1 and causing waste of the height space of the battery, thereby facilitating to ensure the energy density of the battery using the battery cover plate.

[0048] Optionally, in the embodiment, the top cover sheet 1 is further provided with a liquid injection hole 13, through which the electrolyte can be injected into the battery shell, and then the liquid injection hole 13 is sealed by using a sealant pin or the like.

[0049] Optionally, in the embodiment, the top cover sheet 1 is further provided with an explosion-proof valve assembly 14, so that when the internal pressure of the battery shell exceeds the protection range, the explosion-proof sheet in the explosion-proof valve assembly 14 can be broken, the high-temperature and high-pressure gas inside can be discharged outward, the internal pressure of the battery shell is reduced, and the explosion of the battery is prevented.

[0050] Optionally, in the embodiment, the pole post assembly 2 further comprises an injection molding part 24, which is located between the fixed sleeve ring 21 and the pole post terminal. In the embodiment, the injection molding part 24 and the pole post terminal are formed by flowing between them through the assembly gap between the pole post terminal and the buckling part 212, and then filling the injection molding part 24 between the pole post terminal and the buckling part 212 after the injection molding part 24 is solidified, so that the injection molding part 24 is fixed with the pole post terminal by encapsulation, which can further improve the flow performance and tensile performance of the pole post terminal and can internally strengthen the fixing effect of the pole post terminal.

[0051] It should be noted that in other parallel embodiments, the injection molding part 24 can be wrapped around the outer circumferential surface of the pole post terminal to assemble the injection molding part 24 and the pole post terminal by integral molding. For example, during assembly, the pole post terminal with the injection molding part 24 wrapped thereon can be directly inserted into the fixed sleeve ring 21, so that the outer side surface of the injection molding part 24 is tightly fitted with the inner side surface of the buckling part 212, thereby realizing the isolation between the pole post terminal and the buckling part 212.

[0052] Optionally, in the embodiment, the stainless steel lithium battery cover plate further comprises a lower plastic 3 arranged on the top cover sheet 1 on the side close to the battery shell. In one of the embodiments of the embodiment, the lower plastic 3 is connected with the top cover sheet 1 by clamping or hot melting, and the lower plastic 3 is provided with a lower plastic through hole 31 corresponding to the pole post through hole, a liquid injection through hole 32 corresponding to the liquid injection hole 13, and a vent piece gas permeation hole 33 corresponding to the explosion-proof valve assembly 14, wherein the liquid injection through hole 32 is arranged directly below the liquid injection hole 13, and the vent piece gas permeation hole 33 is arranged directly below the explosion-proof valve assembly 14.

[0053] The embodiment further provides a battery, which comprises a battery shell, a conductive inner core and a battery cover plate, the battery shell has an inner cavity, the conductive inner core can be placed in the inner cavity, and the battery cover plate is sealed and arranged on the battery shell to encapsulate the conductive inner core in the battery shell, and the battery cover plate is the stainless steel lithium battery cover plate in the specific embodiments.

[0054] The battery assembling process provided by the utility model is simpler, the assembling process of welding the pole post terminal and the top cover sheet 1 is not needed, the pole post terminal can be stably installed on the top cover sheet 1 only by the mechanical fixation of the fixing sleeve ring 21 to the pole post terminal, thereby the influence of welding on the internal resistance of the pole post terminal is avoided, and then the good conductive performance of the battery is ensured, and the use safety and reliability of the battery are improved.

[0055] In the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] Obviously, the above embodiments of the utility model are only for clear illustration of the utility model, and are not a limitation on the implementation mode of the utility model. For ordinary skilled persons in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A stainless steel lithium battery cover plate characterized by, The utility model relates to a kind of top cover sheet and pole post assembly, including: Top cover sheet (1), the pole post via hole is opened in the top cover sheet (1); Pole post assembly (2), the pole post assembly (2) is installed in the pole post via hole, and the pole post assembly (2) includes fixed collar (21) and pole post terminal, wherein: The fixed collar (21) includes support part (211) and crimping part (212), the surface of the support part (211) is provided with the crimping part (212) and is arranged upwardly, the support part (211) is fixed at the opening of the pole post via hole, and the bottom of the support part (211) is penetrated and opened to avoid the hole that communicates with the pole post via hole, the pole post terminal is penetrated in the avoid hole and the pole post via hole, and is overlapped on the support part (211); The part of the crimping part (212) is in the state of bending, and is crimped on the top surface of the pole post terminal, to clamp the pole post terminal between the crimping part (212) and the support part (211).

2. The stainless steel lithium battery cover plate of claim 1, wherein, The fixed collar (21) further includes buckling part (213), the surface of the support part (211) is provided with the buckling part (213) and is arranged downwardly, the buckling part (213) is penetrated in the pole post via hole, and the part of the buckling part (213) is in the state of bending, and is crimped on the lower surface of the top cover sheet (1).

3. The stainless steel lithium battery cover plate of claim 2, wherein, The part of the buckling part (213) is fixedly connected with the lower surface of the top cover sheet (1) by laser welding.

4. The stainless steel lithium battery cover plate of claim 2, wherein, The part of the top cover sheet (1) at the opening of the pole post via hole is protruded upwardly, and forms limiting convex ring (12), the support part (211) is overlapped on the limiting convex ring (12), and the part of the buckling part (213) is bent and crimped on the bottom of the limiting convex ring (12).

5. The stainless steel lithium battery cover plate of claim 2, wherein, The pole post terminal includes column body (2201) and annular flange (2202), the annular flange (2202) is protruded on the outer side wall surface of the column body (2201), the column body (2201) is penetrated in the pole post via hole and the avoid hole, the annular flange (2202) is overlapped on the support part (211), and the part of the crimping part (212) is crimped on the annular flange (2202).

6. The stainless steel lithium battery cover plate of claim 5, wherein, The pole post assembly (2) further includes sealing ring (23), and the sealing ring (23) is clamped between the fixed collar (21) and the pole post terminal.

7. The stainless steel lithium battery cover plate of claim 6, wherein, The sealing ring (23) includes annular horizontal part (231) and annular vertical part (232), the horizontal part (231) and the vertical part (232) form stepped annular structure, the horizontal part (231) of the sealing ring (23) is clamped and sealed between the annular flange (2202) and the support part (211), and the vertical part (232) of the sealing ring (23) is clamped and sealed between the column body (2201) and the buckling part (213).

8. The stainless steel lithium battery cover plate according to any one of claims 1-7, wherein, The pole post assembly (2) further includes injection molding (24), and the injection molding (24) is located between the fixed collar (21) and the pole post terminal. The injection molding part (24) is wrapped on the pole terminal; or the injection molding part (24) is integrally formed with the pole terminal by injection molding.

9. The stainless steel lithium battery cover plate according to any one of claims 1-7, wherein, The stainless steel lithium battery cover plate further comprises a lower plastic (3) arranged on the side of the top cover sheet (1) abutting against the battery shell.

10. A battery characterized by The stainless steel lithium battery cover plate is used for sealing the conductive inner core in the battery shell.

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