Battery cell cover plate assembly and battery cell structure

Abstract

The utility model relates to a battery cell cover plate assembly and a battery cell structure, the battery cell cover plate assembly comprises a cover plate and a pole, the pole comprises a first pole body and a second pole body, the second pole body is divided into a main body part and an extension part, the extension part is used for connecting an external connecting sheet, and a height difference exists between the top surface of the extension part and the top surface of the main body part. In the battery cell module, the connecting sheet is connected to the extension part of the second pole body, the arrangement space of the connecting sheet is provided by the design of height difference, and the volume occupation during the connection of the poles can be reduced, so that the volume utilization rate is improved. According to the optimized battery cell structure, the specific connecting positions of the connecting pieces are expanded through structure optimization, different types of connecting pieces can be used at the specific connecting positions, and the battery cell structure is also suitable for different scenes such as welding and screw connection on the basis of utilizing the space to the maximum extent, so that the universality of the battery cell structure is improved, and the battery cell structure is suitable for popularization and application. In addition, a heat dissipation path can be optimized through the mode, and the cooling efficiency of the module is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a battery cell cover plate assembly and a battery cell structure. BACKGROUND

[0002] Lithium ion / sodium ion batteries are widely used in electric vehicles, portable electronic devices, and large-scale energy storage systems. Such batteries are usually composed of basic components such as positive electrode material, negative electrode material, separator, electrolyte, and shell, and have various packaging forms, including square aluminum shell, square soft package, cylindrical aluminum shell, and cylindrical steel shell. Each packaging form has its unique advantages and application scenarios, aiming to improve the unit volume energy density, safety, and cycle life of the battery.

[0003] In terms of battery cell structure, square batteries usually use winding or stacking process to assemble the battery cell, which determines the arrangement of materials inside the battery cell and the space utilization. The design of one or two side tabs allows the positive / negative tabs to be welded to the positive / negative transition piece or pole, thereby completing the electrical connection between the battery cell and the external circuit. Current technical solutions can effectively improve the sealing performance of the battery cell cover plate by improving the setting of the pole and the layout of the internal connecting piece, thereby reducing the risk of electrolyte leakage, prolonging the service life of the battery. However, the traditional battery cell cover plate assembly and battery cell structure still have room for improvement in terms of volume utilization.

[0004] Despite the significant progress made in battery cell cover plate assemblies and battery cell structures, there are still some challenges and problems. First, how to further improve the space utilization and unit volume energy density of the battery cell while ensuring the performance and safety of the battery is a problem that needs to be solved. The sealing performance of the battery cell cover plate assembly has been improved, but there is still a risk of electrolyte leakage under extreme conditions, which not only affects the service life of the battery, but also may cause safety accidents. Therefore, it is necessary to continue to optimize the design of the battery cell cover plate assembly to improve its sealing performance and reliability. In addition, with the popularity of electric vehicles and portable electronic devices, the performance requirements for batteries are also increasing. How to improve the cycle life and safety of the battery while ensuring its small occupied space is also one of the focuses of current battery technology research. SUMMARY

[0005] The purpose of the present application is to provide an electric core cover plate assembly and an electric core structure, which can improve the space utilization rate when the electric core forms a module, is suitable for different scenes such as welding and screw connection, and is also convenient for heat dissipation through the pole column. The purpose of the present application is achieved by the following technical scheme. The electric core cover plate assembly comprises a cover plate and a pole column. The pole column comprises a first pole column body and a second pole column body. The cover plate comprises a mounting hole. The mounting hole penetrates the cover plate. The first pole column body is arranged in the mounting hole. The second pole column body is arranged on the outside of the cover plate and is fixedly connected with the first pole column body.

[0006] The second pole column body comprises a main body part and an extension part. The main body part is used for fixedly connecting with the first pole column body. The extension part is used for connecting with a connecting piece. The top surface of the extension part has a height difference with the top surface of the main body part.

[0007] In one embodiment, a sealing member is arranged between the cover plate and the first pole column body and the second pole column body.

[0008] In one embodiment, the sealing member comprises an upper plastic member, a sealing ring and a lower plastic member.

[0009] In one embodiment, a screw hole is arranged on the extension part. The screw hole is used for threadedly connecting with the connecting piece.

[0010] In one embodiment, an adapter piece is arranged. One end of the adapter piece is connected to the first pole column body on the inner side of the cover plate. The other end of the adapter piece is used for connecting a pole ear.

[0011] In addition, the present application also provides an electric core structure, which comprises a battery shell, a bare electric core and the aforementioned electric core cover plate assembly.

[0012] The adapter piece connects the first pole column body in the electric core cover plate assembly and the pole ear pre-welded together in the bare electric core.

[0013] The connecting piece is connected to the extension part of the second pole column body in the electric core cover plate assembly.

[0014] In one embodiment, the pole ear pre-welded together and the first pole column body in the electric core cover plate assembly are respectively arranged at the positions of the adjacent two sides of the bare electric core.

[0015] In one embodiment, the height difference between the top surface of the extension part and the top surface of the main body part is equal to or greater than the thickness of the connecting piece.

[0016] In one embodiment, a liquid cooling structure is further arranged. The liquid cooling structure is in thermal contact with the extension part and the main body part at the same time.

[0017] Compared with the prior art, the application has the following beneficial effects:

[0018] The electric core cover plate assembly of the application is provided with the structure of the second pole post body and the first pole post body, so that the layout of the pole piece in the module is more compact, the space is maximized, unnecessary space waste is reduced, and the energy density that can be accommodated in the unit volume of the module is improved. At the same time, the structural design of the electric core cover plate assembly is compatible with welding, screwing and other connection methods, and the adaptability and flexibility of the electric core in the module are enhanced. The height difference between the extension part and the main body part of the second pole post body facilitates the connection of the external connecting piece, the contact area is extended, additional space is provided for heat dissipation, the heat dissipation efficiency of the electric core is effectively improved, and the stability and safety of the electric core are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of an electric core cover plate assembly of an embodiment of the application;

[0020] Figure 2 is a cross-sectional structural schematic diagram of an electric core structure at a first pole post body position of an embodiment of the application;

[0021] Figure 3 is a cross-sectional structural schematic diagram of an electric core structure at a first pole post body position of another embodiment of the application;

[0022] Figure 4 is a structural schematic diagram of an electric core structure of an embodiment of the application;

[0023] Figure 5 is a structural schematic diagram of an assembled bare electric core and electric core cover plate assembly in an embodiment of the application;

[0024] Figure 6 is a structural schematic diagram of an electric core module of an embodiment of the application;

[0025] Figure 7 is a structural schematic diagram of an electric core module including a cooling structure in an embodiment of the application.

[0026] BRIEF DESCRIPTION OF REFERENCE NUMERALS: 100, cover plate; 110, battery shell; 200, first pole post body; 300, second pole post body; 310, main body part; 320, extension part; 321, screw hole; 400, sealing element; 410, upper plastic element; 420, sealing ring; 430, lower plastic element; 500, adapter piece; 600, bare electric core; 700, connecting piece. DETAILED DESCRIPTION

[0027] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings, not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] The terms "comprising" and "having" and any variations thereof in the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally further comprises steps or units not listed, or optionally further comprises other steps or units inherent to these processes, methods, products or devices.

[0029] In this paper, "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0030] The structure design of the battery cell as the core component of the battery system is the key to improve the performance of the battery system. The battery cell cover assembly, as an important part of the battery cell, not only bears the heavy responsibility of connecting the external circuit and protecting the internal structure of the battery cell, but also affects the heat dissipation performance, sealing performance and overall stability of the battery cell. Therefore, it is necessary to develop a battery cell cover assembly with compact structure, excellent heat dissipation performance, reliable sealing and simple manufacturing, a battery cell structure and a manufacturing method thereof. The present application first provides a battery cell cover assembly. By optimizing the structure design of the battery cell cover assembly and combining with the precise manufacturing process, the space utilization rate and energy density per unit volume of the battery cell in the module are improved, and the heat dissipation performance and sealing reliability of the battery cell are also enhanced. Please refer to Figure 1 , Figure 1 The structure of the battery cell cover assembly of the present application is shown in the figure. The battery cell cover assembly of the present application specifically includes a cover plate 100 and a pole. The pole includes a first pole body 200 and a second pole body 300. The cover plate 100 includes a mounting hole, the mounting hole penetrates through the cover plate 100, the first pole body 200 is arranged in the mounting hole, and the second pole body 300 is arranged on the outside of the cover plate 100 and is fixedly connected with the first pole body 200.

[0031] The second pole body 300 includes a main body part 310 and an extension part 320, the main body part 310 is used for fixed connection with the first pole body 200, and the extension part 320 is used for connection with the connecting sheet 700, and the top surface of the extension part 320 has a height difference with the top surface of the main body part 310.

[0032] The pole in the battery cell cover plate assembly of the application includes a first pole body 200 and a second pole body 300, the cover plate 100 is designed with a mounting hole penetrating through the whole body, the first pole body 200 is arranged in the mounting hole to realize electrical connection between the battery cell and the external circuit, in order to ensure the stability and safety of the connection, the second pole body 300 is arranged outside the cover plate 100 and fixedly connected with the first pole body 200, in order to improve the sealing performance and safety of the battery cell.

[0033] The second pole body 300 includes a main body part 310 and an extension part 320, the main body part 310 is used for fixed connection with the first pole body 200, and the extension part 320 is used for connection with the connecting sheet 700, and the top surface of the extension part 320 has a height difference with the top surface of the main body part 310. The connecting sheet 700 is not arranged at the same position as the first pole body 200, and the height difference between the top surface of the extension part 320 and the top surface of the main body part 310 can be used to accommodate the connecting sheet 700, which not only optimizes the overall structure of the battery cell, but also makes the layout of the battery cell connection structure in the module more flexible and compact.

[0034] In addition, the specific connection position of the external connecting sheet 700 is expanded, and the first pole body 200 is connected through the main body part 310, so that the extension part and the first pole body 200 are not closely related, which not only maximizes the use of space, but also adjusts the extension part 320 to be suitable for different scenes such as welding and screwing. In addition, the extension part 320 also expands the area of the heat conduction part, thereby facilitating the improvement of heat dissipation efficiency. The second pole body 300 is arranged outside the cover plate 100, where the outside refers to the side of the battery cell cover plate assembly as the outer surface of the battery cell after assembly, which is fixedly connected with the first pole body 200, and the fixed connection refers to that after installation, the first pole body 200, the cover plate 100 and the second pole body 300 do not produce relative displacement as a whole, which can be welded or screwed, and the specific connection mode can be selected as needed.

[0035] The second pole body 300 can be an integral structure, that is, the main body part 310 and the extension part 320 are as a whole, or can be separately manufactured and formed, for example, the independent main body part 310 and the extension part 320 are respectively manufactured, and the independent main body part 310 and the extension part 320 are pressed together when assembled, and the integral structure is preferably used. The main body part 310 is used for fixedly connecting with the first pole body 200, and the fixedly connecting mode includes welding, pressing and the like, and the specific connecting mode is not limited in the application. The extension part 320 is used for connecting the external connecting sheet 700, and the connecting sheet 700 herein refers to an external part used for electrically connecting with the battery cell after the battery cell cover plate assembly is assembled to form the battery cell, and can also simultaneously include other functions, for example, heat transfer function, and can be busbar, connecting electrode and heat dissipation part and the like.

[0036] On the basis that the top surface of the extension part 320 has a height difference with the top surface of the main body part 310, the area of the extension part 320 is greater than the area of the main body part 310, and the surface of the extension part 320 can be further treated, and at the same time, surface smoothing treatment is performed and a threaded hole 321 is arranged, and the smooth surface can make the extension part 320 better connect with the connecting sheet 700, including increasing the bonding force and making the contact more complete, and in the technical scheme that the main body part 310 and the extension part 320 are separately arranged, the structure design of the extension part 320 of the second pole body 300 can also be adjusted, without changing the design of the first pole body 200 and other structures, in addition, in order to better realize the combination of the extension part 320 and the cover plate 100, a containing groove for containing the extension part 320 can be arranged in the cover plate 100, so that the extension part 320 can better fit on the cover plate 100.

[0037] Please refer to Figure 2 , Figure 2 is a cross-sectional structure schematic view of the battery cell structure of one embodiment of the application at the position of the first pole body, and is a specific leading mode of the first pole body 200 under the plastic cover plate technical scheme, the first pole body 200 in the cover plate assembly is embedded in the plastic cover plate, and is connected with the second pole body 300 and the adapter sheet 500 on both sides, and is sealed at the same time. Specifically, it also includes a sealing member 400, which is arranged between the cover plate 100 and the first pole body 200 and the second pole body 300, please refer to Figure 3 , Figure 3The cross-sectional structure diagram of the cell structure of another embodiment of the application at the position of the first pole body 200 is a specific lead-out mode of the first pole body 200 under the aluminum cover plate technical solution. In this mode, the cover plate assembly further includes a sealing member 400, which is arranged between the cover plate 100 and the first pole body 200 and the second pole body 300, and can effectively prevent the leakage of harmful substances such as electrolyte, thereby improving the safety and service life of the battery. Further, in the technical solution of the aluminum cover plate, the sealing member 400 includes an upper plastic member 410, a sealing ring 420 and a lower plastic member 430. The upper plastic member 410 is usually located at the top of the sealing assembly, in the space between the second pole body 300 and the cover plate 100, to seal the side of the second pole body 300. The lower plastic member 430 is located in the space between the bottom plate of the first pole body 200 and the cover plate 100. The sealing ring 420 between the upper plastic member 410 and the lower plastic member 430 is usually made of elastic material and has good resilience and sealing performance. The design of the sealing ring 420 can closely fit the surface of the first pole body 200, and can maintain stable sealing effect even in dynamic environments such as pressure changes, temperature changes or slight vibrations, effectively preventing liquid leakage. The sealing member 400 can achieve sealing in multiple aspects, prolonging the service life and reliability of the sealing member 400.

[0038] Specifically, the extension part 320 is provided with a screw hole 321 for threaded connection with the connecting sheet 700. Please refer to Figures 2-3 The extension part 320 is provided with a screw hole 321 for threaded connection with the external connecting sheet 700. The screw hole 321 is arranged at a proper position of the extension part 320 to realize stable and reliable threaded connection with the external connecting sheet 700. The extension part 320 usually extends outward from the main body structure by a certain length, providing sufficient space to ensure stability and convenience when connecting with the external connecting sheet 700, and forming a tight and firm threaded connection during the connection process. When the screw hole 321 is threaded with the external connecting sheet 700, the thread on it gradually engages with the thread in the screw hole 321 by rotating the screw, until a predetermined tightening torque is reached. This connection mode not only provides good mechanical strength and electrical contact, but also effectively resists vibration and loosening, ensuring long-term stability and reliability of the connection.

[0039] Specifically, the adapter piece 500 is connected at one end to the first pole post body 200 on the inner side of the cover plate 100 and is used to connect the pole tab at the other end. The adapter piece 500 is firmly connected at one end to the first pole post body 200, and the connection point is located on the inner side of the cover plate 100, which ensures high reliability and mechanical stability of the electrical connection between the adapter piece 500 and the first pole post body 200, and the other end is connected to the pole tab in the pole piece. The specific structure of the bare cell 600 is not limited, and it can be known that the number of adapter pieces 500 is multiple, one adapter piece 500 connects the same type of pole tab in the stacked pole piece, for example, the connected pole tab can be a pole tab welded together, realizing efficient and stable connection.

[0040] Please refer to Figures 4-7 , the application further provides a cell structure, comprising a battery shell 110, a bare cell 600 and the aforementioned cell cover plate assembly, the adapter piece 500 connects the first pole post body 200 in the cell cover plate assembly and the pole tab welded together in advance, the connecting piece 700 is connected to the extension 320 of the second pole post body 300 in the cell cover plate assembly, and the specific structure can be seen from Figure 6 . Wherein the bare cell 600 is processed by precise stacking or winding process of positive pole piece, negative pole piece and separator, which is flexible and various in form and is not limited, in the preparation process of the bare cell 600, the pole tabs of the negative pole piece and the positive pole piece can be welded together in advance respectively, which can improve the overall structural strength of the cell, so that it can better resist the influence of external factors such as vibration and impact. The adapter piece 500 connects the first pole post body 200 in the cell cover plate assembly and the pole tab welded together in advance. Because the second pole post body 300 including the main body 310 and the extension 320 is adopted, the connecting piece 700 outside the formed cell structure can be installed on the extension 320, so that the components are no longer stacked at the position of the first pole post body 200, which ensures that the second pole post body 300 realizes efficient and stable connection, reduces the space occupied by the connecting components, so as to increase the area ratio of the pole piece in the bare cell 600, sets the pole tab on both sides, which can maximize the use of the height space inside the cell, and after the side welding is completed, the pole tab or the adapter piece does not need to be folded again, the wasted width space is less, and it is especially suitable for short and wide type cells. If the positive and negative pole tabs are arranged at the top, they need to be welded first, and then the adapter piece and the cover plate are turned over, which will cause waste of height space, and the setting mode of the application can realize the increase of energy density in unit volume. In addition, the explosion-proof valve is arranged on the battery shell 110 or the cell cover plate assembly.

[0041] Specifically, the pre-welded tab and the first pole body 200 in the cell cover plate assembly are respectively arranged at the positions adjacent to two sides of the bare cell 600. Arranging the tab and the first pole body 200 at the positions adjacent to two sides of the bare cell 600 can make full use of the area outside the tab on the tab side, and the adapter plate 500 also does not need to occupy too much space on the tab side. During the discharging or charging process of the cell, the current flows from the first pole body 200 to the tab through the adapter plate 500, and then is distributed and transmitted through the conductive structure inside the bare cell 600. The tabs corresponding to the positive and negative poles can be arranged at opposite sides, and this layout design helps to reduce the current concentration and thermal effect inside the cell, and can improve the discharging efficiency and cycle life of the cell. The cell structure proposed in the present application can also expose the adapter plate 500 and the tab on the side by arranging the pre-welded tab and the first pole body 200 in the cell cover plate assembly at the positions adjacent to two sides of the bare cell 600, which facilitates direct welding and other specific connection operations, thereby simplifying the assembly process.

[0042] Please refer to Figure 6 The height difference between the top surface of the extension part 320 and the top surface of the main body part 310 is equal to or greater than the thickness of the connecting sheet 700. When the cell structure is used as a basic unit, the connecting sheet 700 is connected to the extension part 320 of the second pole body 300 in the cell cover plate assembly. This extension part 320 extends outward from the main body part 310 of the second pole body 300 and is specially designed to have a certain height difference between its top surface and the top surface of the main body part 310. For example, in a conventional cell, the shoulder height is 204 mm, the pole height is 3 mm, the total height is 207 mm, the thickness of the welded connecting sheet is 2 mm, and the protrusion after welding is 1 mm, so the total height of the module is at least 210 mm. Assuming that the module height is still 210 mm, after using the stepped pole, the cell shoulder height can be 206 mm, the total height of the first pole body 200 of the cell is 210 mm (4 mm difference from the shoulder height), and the total height of the second pole body 300 of the cell is 207 mm (1 mm difference from the shoulder height). Here, the 3 mm height difference can install the connecting sheet, which is equivalent to increasing the shoulder height of the cell by 2 mm, i.e. increasing the space inside the cell by 2 mm. When the thickness of the connecting sheet 700 is less than or equal to the height difference between the extension part 320 and the main body part 310, the connecting sheet 700 and the extension part 320 form a fit, and the top surface of the connecting sheet 700 does not exceed the top surface of the main body part 310, so it does not need to occupy the space on the height of the first pole body 200. This design helps to optimize the space layout of the cell module, and by directly connecting the connecting sheet 700 to the extension part 320, the space inside the module can be more effectively utilized, and unnecessary space waste can be reduced. For example, in the technical solution of Figure 7 The connecting sheet 700 can be a bus bar, and a plurality of cell structures are connected in series to form a cell module.

[0043] Please refer to Figure 7 , Figure 7 is a structural diagram of a battery cell module including a cooling structure in the embodiments of the present application, specifically, also including a liquid cooling structure, which is in thermal contact with the extension part 320 and the main body part 310 at the same time. In the process of constructing the battery cell module, in addition to the battery cell structure, the connecting sheet 700, and the extension part 320 and the main body part 310 of the second pole body 300 in the battery cell cover plate assembly, the second pole body 300 structure of the present application can better realize the assembly of the cooling structure and improve the cooling efficiency when the liquid cooling structure is applied. The liquid cooling structure can be designed to be in thermal contact with the extension part 320 and the main body part 310 of the second pole body 300 in the battery cell cover plate assembly at the same time, realizing efficient thermal management of the battery cell module. Specifically, the liquid cooling structure can be attached to the surface of the extension part 320 and the main body part 310 through thermal conductive glue or thermal conductive sheet. In addition, under the technical solution that the connecting sheet 700 has been arranged on the extension part 320, the liquid cooling structure can simultaneously contact the first pole body 200 and the connecting sheet 700, and the arrangement of thermal conductive glue or thermal conductive sheet can better eliminate the height difference and ensure good contact between the pole and the liquid cooling plate, thereby maximizing the use of heat conduction principle to quickly remove the heat generated by the battery cell module during charging and discharging. Compared with the technical solution that the connecting sheet 700 is arranged on the first pole body 200, the technical solution of the present application expands the thermal conduction area and can fully utilize the better thermal conductivity of metal.

[0044] Since the extension part 320 and the main body part 310 are areas with more heat in the battery cell module, and the heat is directly dissipated from the tab to the pole, which belongs to heat transfer between metal materials, the heat dissipation effect is higher than that through the bare battery cell to the shell, therefore, this design of the liquid cooling structure can realize cooling of the key parts and ensure lower temperature rise of the battery cell module during operation. The simultaneous thermal contact of the liquid cooling structure with the extension part 320 and the main body part 310 also helps to realize temperature balance inside the module. In the battery cell module, due to the unevenness of battery cell arrangement and current distribution, local temperature may be too high or too low. The introduction of the liquid cooling structure can effectively reduce the temperature difference inside the module and improve the overall thermal management efficiency through rapid conduction and distribution of heat. By introducing the liquid cooling structure into the battery cell module and making it in thermal contact with the extension part 320 and the main body part 310 of the second pole body 300 in the battery cell cover plate assembly at the same time, the thermal management efficiency can be improved, precise cooling and temperature balance can be realized, and thus the overall performance and reliability of the battery cell module can be improved.

[0045] The battery cell structure in the present application can be formed into a battery cell module through the connecting sheet 700, and due to the design and optimization of the second pole body 300 structure, the space of the battery cell module can also be fully utilized.

[0046] From the foregoing, the application first proposes an optimized battery cell cover plate assembly, which comprises a cover plate, a first pole body, a second pole body and a sealing element. The cover plate is designed with a mounting hole, and the first pole body is arranged in the mounting hole to realize the electrical connection between the battery cell and the external circuit. The second pole body is arranged outside the cover plate and is fixedly connected with the first pole body to ensure the stability and safety of the connection. The second pole body is designed to include a main body part and an extension part. The main body part is fixedly connected with the first pole body, and the extension part is used to connect an external connecting sheet to realize the connection between the battery cell and the external circuit. A certain height difference is designed between the top surface of the extension part and the top surface of the main body part. This design not only optimizes the overall structure of the battery cell, but also makes the layout of the battery cell connection structure in the module more flexible and compact, thereby improving the space utilization and the energy density per unit volume of the battery cell.

[0047] In addition, the fixed connection of the second pole body with the first pole body and the arrangement of the sealing element together realize the efficient, reliable and safe connection between the battery cell and the external circuit. The height difference between the extension part and the main body part further optimizes the layout of the battery cell connection structure in the module. At the same time, the specific connection position of the external connecting sheet is expanded. The first pole body is connected through the main body part, so that the extension part and the first pole body do not need to be closely associated, which maximizes the use of space and is suitable for different scenarios such as welding and screwing.

[0048] The above is only one specific embodiment of the application, and any improvement made on the basis of the concept of the application is considered to be within the protection scope of the application.

Claims

1. An electrochemical cell cover plate assembly, comprising: The application relates to a battery cell cover plate assembly, which comprises a cover plate (100), a pole column, the pole column comprises a first pole column body (200) and a second pole column body (300), the cover plate (100) comprises a mounting hole, the mounting hole penetrates through the cover plate (100), the first pole column body (200) is arranged in the mounting hole, and the second pole column body (300) is arranged outside the cover plate (100) and is fixedly connected with the first pole column body (200). The second pole column body (300) comprises a main body part (310) and an extension part (320), the main body part (310) is used for being fixedly connected with the first pole column body (200), the extension part (320) is used for being connected with a connecting sheet (700), and the top surface of the extension part (320) has a height difference with the top surface of the main body part (310).

2. The cell cover plate assembly of claim 1, wherein, The battery cell cover plate assembly further comprises a sealing member (400), which is arranged between the cover plate (100) and the first pole column body (200) and the second pole column body (300).

3. The cell cover plate assembly of claim 2, wherein, The sealing member (400) comprises an upper plastic member (410), a sealing ring (420) and a lower plastic member (430).

4. The cell cover plate assembly of claim 1, wherein, The extension part (320) is provided with a screw hole (321), and the screw hole (321) is used for being threadedly connected with the connecting sheet (700).

5. The cell cover plate assembly of claim 1, wherein, The battery cell cover plate assembly further comprises an adapter sheet (500), one end of the adapter sheet (500) is connected to the first pole column body (200) on the inner side of the cover plate (100), and the other end is used for being connected with a pole lug.

6. An electric cell structure, characterized by, The battery cell cover plate assembly comprises a battery shell (110), a bare cell (600) and the battery cell cover plate assembly as claimed in any one of claims 1-5. The adapter sheet (500) connects the first pole column body (200) in the battery cell cover plate assembly and a pole lug pre-welded in the bare cell. The connecting sheet (700) is connected to the extension part (320) of the second pole column body (300) in the battery cell cover plate assembly.

7. The cell structure of claim 6, wherein, The pole lug pre-welded and the first pole column body (200) in the battery cell cover plate assembly are respectively arranged at positions adjacent to two sides of the bare cell (600).

8. The cell structure of claim 6, wherein, The height difference between the top surface of the extension part (320) and the top surface of the main body part (310) is equal to or greater than the thickness of the connecting sheet (700).

9. The cell structure of claim 6, wherein, The battery cell cover plate assembly further comprises a liquid cooling structure, which is in thermal contact with the extension part (320) and the main body part (310) simultaneously.

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