Battery top cover assembly and accessory, power battery and assembly process, and battery module

Abstract

The invention provides a battery top cover assembly, an accessory, a power battery, an assembly process and a battery module. The battery top cover assembly comprises a top cover assembly and a collector plate assembly which can be fixedly connected with the top cover assembly. The top cover assembly comprises a top cover piece, an insulating part and a terminal plate located above the top cover piece. The top cover sheet and the terminal board are fixedly connected with the insulating part, and the top cover sheet is provided with a first through hole. The collector plate assembly comprises a substrate and a pole formed by integrally extending the substrate upwards, and a blind hole with an upward opening and an internal thread is formed in the pole. The substrate can be fixed below the top cover sheet in an insulating manner, and the pole can penetrate through the first through hole and is electrically insulated from the first through hole. The top cover piece, the insulating piece and the terminal plate are combined to form the top cover assembly, and then the top cover assembly and the collector plate assembly are assembled, so that the assembly process is simple, and transportation is convenient. In addition, when the battery top cover assembly is used for assembling the power battery, the structure is compact, the space utilization rate is high, and the connection firmness between parts is strong.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy storage equipment, and in particular to a battery top cover assembly and accessories, a power battery and an assembly process, and a battery module. Background Art

[0002] As the greenhouse effect continues to intensify, reducing carbon emissions, developing a low-carbon economy and an ecological economy will surely become the direction of future economic development. This is also the right choice and attitude to deal with the world's economic development situation. Electric vehicles have become the main direction of contemporary automobile development and a new growth point for the automobile industry due to their advantages such as energy saving and low pollution, and all of these require the emergence of power batteries. Power batteries are power sources for tools, mostly referring to batteries that provide power for electric vehicles, electric trains, electric bicycles, and golf carts.

[0003] According to the shape, power batteries usually include cylindrical batteries and square batteries. Among them, cylindrical batteries are easier to dissipate heat when assembled into packs due to their appearance characteristics, and have stronger battery life. Therefore, cylindrical batteries are more commonly used in modules with high heat dissipation requirements.

[0004] Cylindrical power batteries usually include a battery cell, a shell and a cover plate for accommodating the battery cell, and the shell is electrically connected to one of the poles of the battery cell (usually the negative pole). The cover plate includes a top cover sheet, a pole, an insulating member, a sealant and a collector plate. The collector plate and the top cover sheet, the top cover sheet and the pole are insulated by an insulating member. A through hole is provided on the top cover sheet, and the pole is penetrated by the through hole and sealed by a sealant. The upper part of the collector plate and the lower part of the pole are welded, and the lower part of the collector plate and the other pole of the battery cell (usually the positive pole) are welded. Due to the presence of multiple components, there is a high probability of poor airtightness after assembly, and with the recycling of the power battery, it is easy to become loose due to subsequent collisions and shaking, which affects the recycling of the battery. Summary of the invention

[0005] Based on the above problems, the purpose of the present invention is to provide a battery top cover assembly and accessories, a power battery and assembly process, and a battery module. When the battery top cover assembly and the battery top cover assembly accessories are assembled into a battery, the structure is compact, the space utilization rate is high, and the connection between the components is strong and reliable, which can meet the recycling of the power battery.

[0006] To achieve the above-mentioned purpose, the first aspect of the present invention provides a battery top cover assembly, including a top cover assembly and a collector plate assembly that can be fixedly connected to the top cover assembly, the top cover assembly includes a top cover sheet, an insulating member and a terminal plate located above the top cover sheet, the top cover sheet and the terminal plate are both fixedly connected to the insulating member, the top cover sheet is provided with a first through hole, the collector plate assembly includes a substrate and a pole formed by integrally extending upward from the substrate, the pole is provided with a blind hole with an upward opening and an internal thread, the substrate can be insulated and fixed below the top cover sheet, and the pole can be passed through and electrically insulated from the first through hole.

[0007] In the battery top cover assembly of the present invention, the battery top cover assembly includes a top cover assembly and a collector plate assembly that can be fixedly connected to the top cover assembly. By combining the top cover sheet, the insulating member and the terminal plate into the top cover assembly and then assembling it with the collector plate assembly, not only the assembly process is simple but also the transportation is convenient. In addition, the collector plate includes a substrate and a pole formed by integrally extending upward from the substrate, and the pole can be penetrated and electrically insulated from the first through hole. The present invention integrates the collector plate and the pole, which not only has a compact structure, but also omits the conventional welding process of the collector plate and the pole. A blind hole with an upward opening and an internal thread is provided in the pole, so it can be used for bolt connection during module assembly. The bolt connection through the internal thread not only has a simple assembly process but also high space utilization.

[0008] As a technical solution of the present invention, the insulating member includes an upper insulating member and a lower insulating member, the upper insulating member is fixed between the top cover plate and the terminal plate, and the lower insulating member is fixed below the top cover plate and can electrically insulate the top cover plate and the collector plate.

[0009] A second aspect of the present invention provides a battery top cover assembly accessory, including a top cover sheet, a terminal plate, a collector plate and an insulating member, the top cover sheet is provided with a first through hole, the terminal plate and the collector plate can be electrically insulated and arranged on the upper and lower sides of the top cover sheet respectively by the insulating member, the collector plate includes a substrate and a pole formed by the substrate extending upward as a whole, the pole is provided with a blind hole opening upward and having an internal thread, the substrate can be insulated and fixed below the top cover sheet, and the pole can be passed through and electrically insulated from the first through hole.

[0010] In the battery top cover assembly of the present invention, the top cover sheet, terminal plate, collector plate and insulating member are used as parts for subsequent power battery assembly, which can realize the diversification of transportation and assembly. In addition, the collector plate includes a substrate and a pole formed by the substrate extending upward as a whole, and the pole can be passed through and electrically insulated from the first through hole. The present invention integrates the collector plate and the pole, which is not only compact in structure, but also omits the conventional welding process of the collector plate and the pole. A blind hole with an upward opening and an internal thread is provided in the pole, so it can be used for bolt connection during module assembly. The bolt connection through the internal thread not only simplifies the assembly process, but also has high space utilization.

[0011] The third aspect of the present invention provides a power battery, comprising a battery cell, a shell for accommodating the battery cell, a top cover sheet, a terminal plate and a collector plate respectively located on the upper and lower sides of the top cover sheet, the top cover sheet seals the shell and is provided with a first through hole, the terminal plate and the collector plate are both electrically insulated from the top cover sheet, the collector plate comprises a substrate located below the top cover sheet, the substrate is electrically connected to one pole of the battery cell and extends upward as a whole to form a pole, the pole is passed through and electrically insulated from the first through hole, a blind hole with an opening upward and an internal thread is provided in the pole, and the end of the pole away from the substrate extends outward as a whole to form a connecting portion that is clamped on the terminal plate.

[0012] In the power battery of the present invention, the collector plate includes a substrate located below the top cover sheet and a pole formed by the substrate extending upwards in an integral manner. The pole extends outwards in an integral manner at one end away from the substrate to form a connection portion clamped on the terminal plate. Therefore, the present invention integrates the collector plate and the pole, which is not only compact in structure, but also omits the conventional welding process of the collector plate and the pole. The connection portion at the upper end of the collector plate is clamped with the terminal plate, so the connection reliability between the terminal plate and the collector plate can be enhanced. A blind hole with an upward opening and an internal thread is provided in the pole, so it can be used for bolt connection during module assembly. The bolt connection through the internal thread not only simplifies the assembly process, but also has high space utilization.

[0013] As a technical solution of the present invention, the pole is riveted to the terminal plate to form the connecting portion.

[0014] As a technical solution of the present invention, the collector plate further includes a limiting portion integrally extending downward from the base plate, and the limiting portion is inserted in the middle of the battery cell.

[0015] A fourth aspect of the present invention provides a method for assembling a power battery, comprising the steps of:

[0016] (1) preparing a battery cell, a shell, the top cover assembly and the collector plate assembly;

[0017] (2) welding and fixing one electrode of the battery cell at the bottom of the substrate;

[0018] (3) inserting the pole into the first through hole and fixing it to be electrically insulated;

[0019] (4) placing the battery cell in the shell, and welding the top cover sheet and the shell to seal them;

[0020] (5) A riveting device with a pressure head and a screw is used to rivet the pole, and the screw extends into the blind hole and drives the pressure head to rivet the pole to the terminal board.

[0021] In the assembly method of the power battery of the present invention, only the top cover assembly and the collector plate assembly are used for assembly, which not only has a simple assembly process but also is convenient for transportation. In addition, by using a riveting device with a pressure head and a screw to rivet the pole, the screw extends into the blind hole and drives the pressure head to rivet the pole to the terminal board, not only can the pole be riveted to the terminal board, but also the pressure on the battery cell during riveting can be greatly reduced, thereby avoiding affecting the battery performance.

[0022] A fifth aspect of the present invention provides another method for assembling a power battery, comprising the steps of:

[0023] (1) preparing a battery cell, a housing, the current collector, the top cover, the terminal plate, and the insulating member, wherein the terminal plate has a second through hole;

[0024] (2) welding and fixing one electrode of the battery cell at the bottom of the substrate;

[0025] (3) sleeve the top cover sheet onto the pole through the first through hole and electrically insulate the top cover sheet from the collector plate;

[0026] (4) sleeve the terminal plate onto the pole via the second through hole and electrically insulate the terminal plate from the top cover plate;

[0027] (5) placing the battery cell in the shell, and welding the top cover sheet and the shell to seal them;

[0028] (6) A riveting device with a pressure head and a screw is used to rivet the pole, and the screw extends into the blind hole and drives the pressure head to rivet the pole to the terminal board.

[0029] In the assembly method of the power battery of the present invention, the collector plate, the top cover sheet, the terminal plate and the insulating member are assembled from bottom to top using dispersed parts and the battery cell, rather than assembling the top cover assembly and the battery cell, and the operation precision requirement is low. In addition, by using a riveting device with a pressure head and a screw to rivet the pole, the screw extends into the blind hole and drives the pressure head to rivet the pole to the terminal plate, not only can the pole be riveted to the terminal plate, but also the pressure on the battery cell during riveting can be greatly reduced, avoiding the impact on the battery performance.

[0030] The sixth aspect of the present invention provides a battery module, comprising a plurality of power batteries arranged in parallel. Adjacent power batteries are connected in series or in parallel via a connecting piece, and the connecting piece is bolted to the pole. When the module is assembled, the bolts are connected via internal threads, which not only simplifies the assembly process but also increases the space utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a three-dimensional diagram of the battery module of the present invention.

[0032] Figure 2 A cross-sectional view of a power battery according to a first embodiment of the present invention.

[0033] Figure 3 It is a cross-sectional view of a power battery according to a second embodiment of the present invention.

[0034] Figure 4 This is a state diagram of the power battery of the present invention before riveting during assembly.

[0035] Figure 5 This is a state diagram of the power battery of the present invention during riveting during assembly.

[0036] Figure 6 FIG. 4 is a cross-sectional view of a top cover assembly according to a first embodiment of the present invention.

[0037] Figure 7 FIG. 4 is a cross-sectional view of a top cover assembly according to a second embodiment of the present invention.

[0038] Figure 8 FIG. 4 is a cross-sectional view of a battery cover assembly according to a first embodiment of the present invention.

[0039] Fig. 9 FIG. 4 is a cross-sectional view of a battery cover assembly according to a second embodiment of the present invention.

[0040] Fig.10 for Figure 2 Enlarged view of the circled area.

[0041] Fig.11 for Figure 3 Enlarged view of the circled area.

[0042] Components comply with the description

[0043] 100-power battery; 10-top cover assembly; 11-top cover sheet; 13-terminal board; 15-injection molded part / insulation part; 15a-first injection molded part / upper insulation part; 15b-second injection molded part / seal; 15c-third injection molded part / lower insulation part; 17-sealing nail; 30-collector plate assembly / collector plate; 31-base plate; 33-pole; 33a-blind hole; 33b-internal thread; 35-connecting part; 37-limiting part; 50-battery cell; 70-housing; 90-riveting equipment; 91-screw; 93-pressing head; 200-connecting piece; 300-frame structure; 400-output main terminal DETAILED DESCRIPTION

[0044] In order to better illustrate the purpose, technical solution and beneficial effects of the present invention, the present invention will be further described below in conjunction with specific drawings. It should be noted that the following drawings are further explanations of the present invention and should not be used as limitations of the present invention.

[0045] like Figure 1 As shown, the battery module (not shown) of the present invention comprises a power battery 100 and a frame structure 300, wherein a plurality of power batteries 100 are arranged in parallel and disposed inside the frame structure 300. Adjacent power batteries 100 are connected in series or in parallel via a connecting sheet 200, and the assembled battery module is charged or discharged with the outside via an output main terminal 400.

[0046] Further Figures 2 to 5 As shown, the power battery 100 includes a battery cell 50, a shell 70 for accommodating the battery cell 50, a top cover sheet 11, a terminal plate 13 and a collector plate 30 respectively located on the upper and lower sides of the top cover sheet 11. The top cover sheet 11 seals the shell 70 and is provided with a first through hole (not shown in the figure), a liquid injection hole (not shown in the figure) and an explosion-proof valve (not shown in the figure). The liquid injection hole is sealed by a sealing nail 17 after liquid injection, and the explosion-proof valve explodes when the internal pressure of the battery exceeds a preset value to prevent the battery from exploding. The terminal plate 13 and the collector plate 30 are both electrically insulated from the top cover sheet 11. The collector plate 30 includes a substrate 31 located below the top cover sheet 11, the substrate 31 is electrically connected to one pole of the battery cell 50 and extends upward to form a pole 33. The pole 33 is penetrated and electrically insulated from the first through hole, and a blind hole 33a with an upward opening and an internal thread 33b is provided in the pole 33. The pole 33 extends outward from one end of the pole 33 away from the substrate 31 to form a connecting portion 35 clamped on the terminal plate 13. Integrating the collector plate 30 and the pole 33 not only makes the structure compact, but also omits the conventional welding process of the collector plate 30 and the pole 33, and the connection portion 35 at the upper end of the collector plate 30 is clamped with the terminal plate 13, so the connection reliability between the terminal plate 13 and the collector plate 30 can be enhanced. When assembled into a battery module, the connecting piece 200 and the pole 33 are bolted. That is, the bolts are fixed through the internal thread 33b. This assembly method not only has a simple assembly process, but also has high space utilization.

[0047] Furthermore, the pole 33 is riveted to the terminal plate 13 to form a connection portion 35. Mechanical and electrical connections are formed on the terminal plate 13 by reverse riveting of the internal thread 33b in the pole 33. When the power battery 100 has a leak or poor sealing, the power battery 100 can be repaired by riveting again.

[0048] Continue as Figure 2 As shown, the collector plate 30 further includes a stopper 37 formed by integrally extending downward from the base plate 31, and the stopper 37 is inserted in the middle of the battery cell 50 to prevent the battery cell 50 from collapsing. In order to increase the flexibility of connection, the size of the stopper 37 inserted in the middle of the battery cell 50 should not be too large, and the size of the stopper 37 inserted in the middle of the battery cell 50 should not exceed one quarter of the height of the battery cell 50.

[0049] In addition, the electrical insulation of the terminal plate 13 and the collector plate 30 from the top cover sheet 11 can be achieved in a variety of ways, such as using an injection molded part 15 for insulation. The injection molded part 15 includes an integrally formed first injection molded part 15a, a second injection molded part 15b, and a third injection molded part 15c. The first injection molded part 15a is between the terminal plate 13 and the top cover sheet 11, the second injection molded part 15b is between the pole 33 and the top cover sheet 11, and the third injection molded part 15c is between the substrate 31 and the top cover sheet 11. This method can be achieved by installing the terminal plate 13, the top cover sheet 11, and the collector plate 30 and then fixing them through external components and then injection molding. This insulation method is suitable for situations where the sealing requirements are not strict. If the sealing requirements are high, other methods can also be used, such as providing an upper insulating part 15a between the terminal plate 13 and the top cover sheet 11, providing a lower insulating part 15c between the substrate 31 and the top cover sheet 11, and providing a sealing part 15b between the pole 33 and the top cover sheet 11. The sealing member 15b can be made of rubber or fluorine-containing rubber, so it has good sealing performance.

[0050] The top cover sheet 11, the insulating member 15, the terminal plate 13 and the current collector plate 30 of the present invention may be in the form of components or in the form of an assembly.

[0051] like Figures 8-9The assembly is shown in the form of an assembly, in which the battery top cover assembly includes a top cover assembly 10 and a collector plate assembly 30 that can be fixedly connected to the top cover assembly 10. The top cover assembly 10 includes a top cover sheet 11, an insulating member 15, and a terminal plate 13 located above the top cover sheet 11, and both the top cover sheet 11 and the terminal plate 13 are fixedly connected to the insulating member 15. The top cover sheet 11 is provided with a first through hole (not shown in the figure). The collector plate assembly 30 includes a substrate 31 and a pole 33 formed by the substrate 31 extending upward as a whole, and a blind hole 33a with an opening upward and an internal thread 33b is provided in the pole 33. The substrate 31 can be insulated and fixed below the top cover sheet 11, and the pole 33 can be penetrated and electrically insulated from the first through hole. Integrating the collector plate 30 and the pole 33 not only has a compact structure, but also omits the conventional welding process of the collector plate 30 and the pole 33. The pole 33 is provided with a blind hole 33a with an upward opening and an internal thread 33b, so it can be used for bolt connection during module assembly. The bolt connection through the internal thread 33b not only simplifies the assembly process but also has high space utilization.

[0052] In this combination, the top cover assembly 10 needs to be fixedly connected before being fixedly connected with the collector plate assembly 30, and it can be fixedly connected by the upper insulating member 15a and the lower insulating member 15c. Specifically, the upper insulating member 15a is fixed between the top cover sheet 11 and the terminal plate 13b, and the lower insulating member 15c is fixed below the top cover sheet 11 so that the top cover sheet 11 and the collector plate 30 can be electrically insulated during subsequent assembly. The upper insulating member 15a and the lower insulating member 15c can be fixed to the top cover sheet 11 by snapping or hot melting. The top cover sheet 11, the insulating member 15 and the terminal plate 13 can be fixed to form an assembly by snapping or hot melting the insulating member 15. In order to further enhance the sealing of the assembly, a sealing member 15b can be provided between the top cover sheet 11 and the pole 33, and the sealing member 15b can be made of rubber or fluorine-containing rubber.

[0053] When such an assembly is used to assemble a power battery, the assembly process may include the following steps.

[0054] (1) The battery cell 50 , the case 70 , the top cover assembly 10 , and the current collector plate assembly 30 are prepared.

[0055] (2) One electrode of the battery cell 50 is fixed to the lower portion of the substrate 31 by welding.

[0056] (3) The pole 33 is passed through the first through hole and fixed in an electrically insulated manner.

[0057] (4) The battery cell 50 is placed in the housing 70 , and the top cover sheet 11 and the housing 70 are welded and sealed.

[0058] (5) A riveting device 90 with a pressure head 93 and a screw rod 91 is used to rivet the pole 33. The screw rod 91 extends into the blind hole 33a and drives the pressure head 93 to rivet the pole 33 to the terminal plate 13 (such as Figures 4-5 As shown, Figures 4-5 Only part of the riveting device 90 is shown).

[0059] In this assembly process, the top cover sheet 11, the insulating member 15 and the terminal board 13 are combined into the top cover assembly 10 and then assembled with the collector plate assembly 30, which not only makes the assembly process simple but also facilitates transportation. By using a riveting device 90 with a pressure head 93 and a screw 91 to rivet the pole 33 (which is a reverse riveting), the screw 91 extends into the blind hole 33a and drives the pressure head 93 to rivet the pole 33 to the terminal board 13. The assembly method can not only rivet the pole 33 to the terminal board 13, but also greatly reduce the pressure on the battery cell 50 during riveting, avoiding affecting the battery performance. In addition, a mechanical connection and an electrical connection are formed on the terminal board 13 by reverse riveting of the internal thread 33b in the pole 33. When the power battery 100 has a poor seal due to leakage, the power battery 100 can be repaired by riveting again.

[0060] The structure after the top cover sheet 11, the insulating member 15, the terminal plate 13 and the collector plate 30 are assembled in the form of components can be as follows Figures 6-7 and Figures 10-11 As shown. The battery top cover assembly includes a top cover sheet 11, a terminal plate 13, a collector plate 30 and an insulating member 15. The top cover sheet 11 is provided with a first through hole, and the terminal plate 13 and the collector plate 30 can be electrically insulated from the upper and lower sides of the top cover sheet 11 by the insulating member 15. The collector plate 30 includes a substrate 31 and a pole 33 formed by the substrate 31 extending upward as a whole. A blind hole 33a with an opening upward and an internal thread 33b is provided in the pole 33. The substrate 31 can be insulated and fixed below the top cover sheet 11, and the pole 33 can be penetrated and electrically insulated from the first through hole. Integrating the collector plate 30 and the pole 33 not only has a compact structure, but also omits the conventional welding process of the collector plate 30 and the pole 33. A blind hole 33a with an opening upward and an internal thread 33b is provided in the pole 33, so it can be used for bolt connection during module assembly. The bolt connection through the internal thread 33b not only has a simple assembly process, but also has a high space utilization rate.

[0061] When assembled as parts, the insulating member 15 may include an upper insulating member 15a and a lower insulating member 15c. Specifically, the upper insulating member 15a may be fixed between the top cover sheet 11 and the terminal plate 13b, and the lower insulating member 15c may be fixed below the top cover sheet 11 so as to electrically insulate the top cover sheet 11 and the collector plate 30 during subsequent assembly. The upper insulating member 15a and the lower insulating member 15c may be fixed to the top cover sheet 11 by snapping or hot melting. In order to further enhance the sealing of the assembly, a sealing member 15b may be provided between the top cover sheet 11 and the pole 33, and the sealing member 15b may be made of rubber or fluorine-containing rubber.

[0062] When such components are used to assemble a power battery, the assembly process may include the following steps.

[0063] (1) The battery cell 50, the case 70, the current collector 30, the top cover sheet 11, the terminal plate 13 and the insulating member 15 are prepared. The terminal plate 13 has a second through hole.

[0064] (2) One electrode of the battery cell 50 is fixed to the lower portion of the substrate 31 by welding.

[0065] (3) The top cover sheet 11 is sleeved onto the pole 33 through the first through hole and the top cover sheet 11 and the current collector plate 30 are electrically insulated.

[0066] (4) The terminal plate 13 is sleeved onto the pole 33 through the second through hole and the terminal plate 13 and the top cover plate 11 are electrically insulated.

[0067] (5) The battery cell 50 is placed in the housing 70 , and the top cover sheet 11 and the housing 70 are welded and sealed.

[0068] (6) A riveting device 90 with a pressing head 93 and a screw rod 91 is used to rivet the pole 33 . The screw rod 91 extends into the blind hole 33 a and drives the pressing head 93 to rivet the pole 33 to the terminal board 13 .

[0069] In this assembly process, the collector plate 30, the top cover sheet 11, the terminal plate 13 and the insulating member 15 are assembled from bottom to top using dispersed parts and the battery cell 50, rather than assembling the top cover assembly 10 and the battery cell 50, and the operation precision requirement is low. In addition, by using a riveting device 90 with a pressure head 93 and a screw 91 to rivet the pole 33 (which is a reverse riveting), the screw 91 extends into the blind hole 33a and drives the pressure head 93 to rivet the pole 33 to the terminal plate 13. The assembly method can not only rivet the pole 33 to the terminal plate 13, but also greatly reduce the pressure on the battery cell 50 during riveting, avoiding affecting the battery performance. In addition, a mechanical connection and an electrical connection are formed on the terminal plate 13 by reverse riveting of the internal thread 33b in the pole 33. When the power battery 100 has a poor leak and seal, the power battery 100 can be riveted again to repair it.

[0070] It should be further explained that the height of the internal thread 33b is lower than the pole 33, that is, the end of the pole 33 away from the substrate 31 is not provided with the internal thread 33b, so that the screw 91 of the riveting device 90 can extend into the blind hole 33a and drive the pressure head 93 to rivet the pole 33.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it is not limited to those listed in the embodiments. Those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A battery top cover assembly, characterized in that: It includes a top cover assembly and a collector plate assembly that can be fixedly connected to the top cover assembly, the top cover assembly includes a top cover sheet, an insulating member and a terminal plate located above the top cover sheet, the top cover sheet and the terminal plate are both fixedly connected to the insulating member, the top cover sheet is provided with a first through hole, the collector plate assembly includes a substrate and a pole formed by integrally extending upward from the substrate, the pole is provided with a blind hole opening upward and having an internal thread, the substrate can be insulated and fixed below the top cover sheet, the pole can be passed through and electrically insulated from the first through hole.

2. The battery cover assembly according to claim 1, characterized in that: The insulating member includes an upper insulating member and a lower insulating member. The upper insulating member is fixed between the top cover sheet and the terminal plate. The lower insulating member is fixed below the top cover sheet and can electrically insulate the top cover sheet from the collector plate.

3. A battery top cover assembly, characterized in that: It includes a top cover sheet, a terminal plate, a collector plate and an insulating member, the top cover sheet is provided with a first through hole, the terminal plate and the collector plate can be electrically insulated and arranged on the upper and lower sides of the top cover sheet respectively by the insulating member, the collector plate includes a substrate and a pole formed by the substrate extending upward as a whole, the pole is provided with a blind hole with an upward opening and an internal thread, the substrate can be insulated and fixed below the top cover sheet, and the pole can be passed through and electrically insulated from the first through hole.

4. A power battery, characterized in that: It includes a battery cell, a shell for accommodating the battery cell, a top cover sheet, a terminal plate and a collector plate respectively located on the upper and lower sides of the top cover sheet, the top cover sheet seals the shell and is provided with a first through hole, the terminal plate and the collector plate are both electrically insulated from the top cover sheet, the collector plate includes a substrate located below the top cover sheet, the substrate is electrically connected to one pole of the battery cell and extends upward to form a pole, the pole is passed through and electrically insulated from the first through hole, a blind hole with an upward opening and an internal thread is provided in the pole, and the pole extends outward at one end away from the substrate to form a connecting portion that is clamped on the terminal plate.

5. The power battery according to claim 4, characterized in that: The pole is riveted to the terminal plate to form the connection portion.

6. The power battery according to claim 4, characterized in that: The collector plate further includes a limiting portion which is integrally extended downward from the base plate, and the limiting portion is inserted in the middle of the battery core.

7. A method of assembling a power battery using the battery top cover assembly according to claim 1 or 2, characterized in that: Includes steps: (1) preparing a battery cell, a shell, the top cover assembly and the collector plate assembly; (2) welding and fixing one electrode of the battery cell at the bottom of the substrate; (3) inserting the pole into the first through hole and fixing it to be electrically insulated; (4) placing the battery cell in the shell, and welding the top cover sheet and the shell to seal them; (5) A riveting device with a pressure head and a screw is used to rivet the pole, and the screw extends into the blind hole and drives the pressure head to rivet the pole to the terminal board.

8. A method of assembling a power battery using the battery top cover assembly according to claim 3, characterized in that: Includes steps: (1) preparing a battery cell, a housing, the current collector, the top cover, the terminal plate, and the insulating member, wherein the terminal plate has a second through hole; (2) welding and fixing one electrode of the battery cell at the bottom of the substrate; (3) sleeve the top cover sheet onto the pole through the first through hole and electrically insulate the top cover sheet from the collector plate; (4) sleeve the terminal plate onto the pole via the second through hole and electrically insulate the terminal plate from the top cover plate; (5) placing the battery cell in the shell, and welding the top cover sheet and the shell to seal them; (6) A riveting device with a pressure head and a screw is used to rivet the pole, and the screw extends into the blind hole and drives the pressure head to rivet the pole to the terminal board.

9. A battery module, characterized in that: The invention comprises a plurality of power batteries according to any one of claims 4 to 6 arranged in parallel.

10. The battery module according to claim 9, characterized in that: The adjacent power batteries are connected in series or in parallel via connecting plates, and the connecting plates are connected to the pole bolts.

Images