Cylindrical power battery and battery module thereof

Abstract

The utility model provides a cylindrical power battery and a battery module thereof. The cylindrical power battery comprises a battery cell, a shell for accommodating the battery cell and a battery top cover assembly for sealing the shell, the battery top cover assembly comprises a top cover sheet and a collector plate which is electrically insulated from the top cover sheet, wherein the collector plate comprises a base plate positioned below the top cover sheet and a limiting part which is formed by integrally extending the base plate downwards. The substrate is connected with one pole of the battery cell, and the limiting part is inserted into the middle of the battery cell. By improving the collector plate, the collapse of the battery cell can be prevented while the electric connection of the battery cell is met, so that the risk of short circuit of the battery is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy energy storage instrument technical field especially relates to a cylindrical power battery and battery module thereof. BACKGROUND

[0002] Power battery is the power supply that provides power source for tools, and is usually used for providing power for electric vehicles, electric trains, electric bicycles and golf carts.

[0003] According to shape, power battery usually includes cylindrical battery and square battery, wherein, cylindrical battery is more used in module with high heat dissipation requirement because it is easier to dissipate heat and has stronger endurance when assembled into pack due to its shape characteristics.

[0004] Cylindrical battery is usually wound, and the positive plate, isolation film and negative plate are wound into a winding core by a winding needle. In order to reduce weight and avoid occupying too much space by winding needle, the winding needle is usually extracted after the winding core is formed. However, in order to meet the demand of large capacity, the winding core is usually large, and the two ends of the winding core, especially the end where the tab and the current collecting plate need to be welded, are prone to collapse. The collapsed tab is prone to cause short circuit of positive and negative electrodes, which has safety risk. SUMMARY

[0005] Based on the above problems, the purpose of the utility model is to provide a cylindrical power battery and battery module thereof. The cylindrical power battery can avoid the collapse of the middle part of the battery core by improving the current collecting plate, thereby reducing the risk of battery short circuit.

[0006] To achieve the above purpose, the utility model provides a cylindrical power battery in one aspect, which comprises a battery core, a shell accommodating the battery core and a battery top cover assembly sealing the shell. The battery top cover assembly comprises a top cover sheet and a current collecting plate electrically insulated from the top cover sheet. The current collecting plate comprises a base plate located below the top cover sheet and a limiting part integrally extended downward from the base plate. The base plate is connected to one of the poles of the battery core, and the limiting part is inserted into the middle part of the battery core.

[0007] In the technical scheme of the utility model, the current collecting plate comprises a base plate located below the top cover sheet and a limiting part integrally extended downward from the base plate. The base plate is connected to one of the poles of the battery core, and the limiting part is inserted into the middle part of the battery core. This kind of current collecting plate can not only meet the electrical connection of the battery core, but also prevent the collapse of the battery core, thereby reducing the risk of internal short circuit of the battery.

[0008] As a technical scheme of the utility model, the battery top cover assembly further comprises a terminal plate located above the top cover sheet and electrically insulated from the top cover sheet.

[0009] As a technical scheme of the utility model, the current collector plate further comprises a pole post integrally extended upwards from the base plate, the top cover sheet is provided with a first through hole, and the pole post is arranged in and electrically insulated from the first through hole.

[0010] As a technical scheme of the utility model, the battery top cover assembly further comprises a pole post, the top cover sheet is provided with a first through hole, and the pole post is arranged in and electrically insulated from the first through hole.

[0011] As a technical scheme of the utility model, the terminal plate and the top cover sheet are provided with a first insulating piece therebetween, the base plate and the top cover sheet are provided with a second insulating piece therebetween, and the pole post and the top cover sheet are provided with a sealing piece therebetween.

[0012] As a technical scheme of the utility model, the battery top cover assembly further comprises a pole post, the top cover sheet is provided with a first through hole, and the pole post is arranged in and electrically insulated from the first through hole.

[0013] As a technical scheme of the utility model, the lower part of the pole post is fixed to the base plate, and the upper part of the pole post is fixed to the terminal plate.

[0014] As a technical scheme of the utility model, the battery top cover assembly further comprises a pole post, the top cover sheet is provided with a first through hole, and the pole post is arranged in and electrically insulated from the first through hole.

[0015] As a technical scheme of the utility model, the terminal plate and the top cover sheet are provided with a first insulating piece therebetween, the base plate and the top cover sheet are provided with a second insulating piece therebetween, and the pole post and the top cover sheet are provided with a sealing piece therebetween.

[0016] The application further provides a battery module, characterized by comprising a plurality of cylindrical power batteries arranged side by side. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of the battery module of the utility model.

[0018] Figure 2 It is a sectional view of the cylindrical power battery of the utility model in the first embodiment.

[0019] Figure 3 It is a sectional view of the cylindrical power battery of the utility model in the second embodiment.

[0020] Figure 4The utility model discloses battery top cover assembly's section view of first embodiment.

[0021] Figure 5 The utility model discloses battery top cover assembly's section view of second embodiment.

[0022] Element meets the explanation

[0023] 100-cylindrical power battery;10-battery top cover assembly;11-top cover sheet;13-terminal plate;15-current collecting plate;151-base plate;153-limiting portion;155-pole post / pole post;17-injection molding piece / insulating piece;17a-first injection molding piece / first insulating piece;17b-second injection molding piece / sealing piece;17c-third injection molding piece / second insulating piece;19-sealing nail;30-electricity core;50-casing;200-connecting sheet;300-enclosure structure;400-output total terminal Specific implementation

[0024] For better explaining the purpose, technical scheme and beneficial effect of the utility model, the utility model will be further explained below with specific drawings. It should be noted that the following drawings are further explanation and description of the utility model, and should not be regarded as the limitation of the utility model.

[0025] As Figure 1 Indicated, the battery module (not shown in the drawing) of the utility model includes cylindrical power battery 100 and enclosure structure 300, and multiple cylindrical power batteries 100 are arranged side by side and arranged in the interior of enclosure structure 300. Adjacent cylindrical power batteries 100 are connected in series or parallel by connecting sheet 200, and the assembled battery module is charged or discharged with the outside through output total terminal 400.

[0026] Further as Figures 2-3 Indicated, cylindrical power battery 100 includes electricity core 30, casing 50 containing electricity core 30 and battery top cover assembly 10 sealing casing 50. As Figures 4-5 Indicated, battery top cover assembly 10 includes top cover sheet 11, terminal plate 13 and current collecting plate 15 respectively located on the upper and lower sides of top cover sheet 11, and terminal plate 13 and current collecting plate 15 are all electrically insulated with top cover sheet 11. Among them, top cover sheet 11 is provided with first through hole (not shown in the drawing), liquid injection hole (not shown in the drawing) and explosion-proof valve (not shown in the drawing). The liquid injection hole is sealed by sealing nail 19 after liquid injection, and the explosion-proof valve bursts when the internal pressure of the battery exceeds the preset value, thereby preventing the battery explosion.

[0027] The structure of current collecting plate 15 can be multiple ways, such as Figure 2 And Figure 4As shown, the current collecting plate 15 includes a base plate 151 below the top cover sheet 11, a limiting portion 153 integrally extended downward from the base plate 151, and a pole 155 integrally extended upward from the base plate 151. The base plate 151 is connected to one of the poles of the battery cell 30, the limiting portion 153 is inserted into the middle portion of the battery cell 30, and the pole 155 is inserted into and electrically insulated from the first through hole. Such a current collecting plate 15 can not only meet the electrical connection of the battery cell 30, but also prevent the collapse of the battery cell 30, thereby reducing the risk of internal short circuit of the battery. In order to increase the flexibility of connection, the size of the limiting portion 153 inserted into the middle portion of the battery cell 30 should not be too large, and the size of the limiting portion 153 inserted into the middle portion of the battery cell 30 should not exceed one fourth of the height of the battery cell 30. Further, the pole 155 can be fixed to the terminal plate 13 by welding. Such a pole 155 corresponds to the pole, and the integration of the current collecting plate 15 and the pole not only has a compact structure, but also omits the welding process of the conventional current collecting plate 15 and the pole.

[0028] For such a structure of the current collecting plate 15, the electrical insulation of the terminal plate 13 and the current collecting plate 15 from the top cover sheet 11 can be achieved in various ways, such as using the injection molding part 17 for insulation. The injection molding part 17 includes a first injection molding portion 17a, a second injection molding portion 17b, and a third injection molding portion 17c integrally formed. The first injection molding portion 17a is between the terminal plate 13 and the top cover sheet 11, the second injection molding portion 17b is between the pole 155 and the top cover sheet 11, and the third injection molding portion 17c is between the base plate 151 and the top cover sheet 11. Such a way can be achieved by installing the terminal plate 13, the top cover sheet 11, and the current collecting plate 15 and then injection molding after being fixed by external components. Such an insulation method is suitable for situations where the sealing requirement is not strict. If the sealing requirement is high, other ways can be used, such as providing a first insulation part 17a between the terminal plate 13 and the top cover sheet 11, a second insulation part 17c between the base plate 151 and the top cover sheet 11, and a sealing part 17b between the pole 155 and the top cover sheet 11. The sealing part 17b can be made of rubber, so it has good sealing performance.

[0029] Of course, the current collecting plate 15 can also have other structures, such as Figure 3 and Figure 5As shown, the current collecting plate 15 includes a base plate 151 below the top cover sheet 11 and a limiting portion 153 integrally extended downward from the base plate 151. The base plate 151 is connected to one pole of the battery cell 30, and the limiting portion 153 is inserted into the middle portion of the battery cell 30. Such current collecting plate 15 can not only meet the electrical connection of the battery cell 30, but also prevent the collapse of the battery cell 30, thereby reducing the risk of internal short circuit of the battery. In order to increase the flexibility of connection, the size of the limiting portion 153 inserted into the middle portion of the battery cell 30 should not be too large, and the size of the limiting portion 153 inserted into the middle portion of the battery cell 30 should not exceed one fourth of the height of the battery cell 30. The battery top cover assembly 10 further includes a pole 155 which is inserted and electrically insulated in the first through hole. The lower portion of the pole 155 is fixed to the base plate 151, and the upper portion of the pole 155 is fixed to the terminal plate 153. The pole 155, the base plate 151 and the terminal plate 153 can be fixed by welding.

[0030] For such a structure of the current collecting plate 15, the electrical insulation of the terminal plate 13 and the current collecting plate 15 from the top cover sheet 11 can be achieved in various ways, such as using the injection molding part 17 for insulation. The injection molding part 17 includes a first injection molding portion 17a, a second injection molding portion 17b and a third injection molding portion 17c which are integrally formed. The first injection molding portion 17a is arranged between the terminal plate 13 and the top cover sheet 11, the second injection molding portion 17b is arranged between the pole 155 and the top cover sheet 11, and the third injection molding portion 17c is arranged between the base plate 151 and the top cover sheet 11. Such a way can be achieved by installing the terminal plate 13, the top cover sheet 11 and the current collecting plate 15 and then injection molding after being fixed by external components. Such an insulation method is suitable for situations where the sealing requirement is not strict. If the sealing requirement is high, other ways can also be used, such as arranging a first insulation part 17a between the terminal plate 13 and the top cover sheet 11, arranging a second insulation part 17c between the base plate 151 and the top cover sheet 11, and arranging a sealing part 17b between the pole 155 and the top cover sheet 11. The sealing part 17b can be made of rubber material, so it has good sealing performance.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood that the present application is not limited to the embodiments described above. Those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application.

Claims

1. A cylindrical power battery, characterized in that, The battery includes a battery cell, a housing containing the battery cell, and a battery top cover assembly that seals the housing. The battery top cover assembly includes a top cover sheet and a current collector plate electrically insulated from the top cover sheet. The current collector plate includes a base plate located below the top cover sheet and a limiting portion integrally formed by extending downward from the base plate. The base plate is connected to one of the poles of the battery cell, and the limiting portion is inserted into the middle of the battery cell.

2. The cylindrical power battery according to claim 1, characterized in that, The battery top cover assembly also includes a terminal plate, which is located above the top cover sheet and electrically insulated from the top cover sheet.

3. The cylindrical power battery according to claim 2, characterized in that, The current collector also includes an electrode post integrally formed by extending upward from the substrate, and the top cover is provided with a first through hole, through which the electrode post passes and is electrically insulated.

4. The cylindrical power battery according to claim 3, characterized in that, It also includes an injection molded part, which includes an integrally formed first injection molded part, a second injection molded part and a third injection molded part, wherein the first injection molded part is located between the terminal plate and the top cover plate, the second injection molded part is located between the pole post and the top cover plate, and the third injection molded part is located between the substrate and the top cover plate.

5. The cylindrical power battery according to claim 3, characterized in that, A first insulating element is provided between the terminal block and the top cover plate, a second insulating element is provided between the substrate and the top cover plate, and a sealing element is provided between the pole and the top cover plate.

6. The cylindrical power battery according to claim 2, characterized in that, The battery top cover assembly also includes a terminal post, the top cover sheet has a first through hole, and the terminal post passes through and is electrically insulated from the first through hole.

7. The cylindrical power battery according to claim 6, characterized in that, The lower part of the electrode post is fixed to the substrate, and the upper part of the electrode post is fixed to the terminal plate.

8. The cylindrical power battery according to claim 6 or 7, characterized in that, It also includes an injection molded part, which includes an integrally formed first injection molded part, a second injection molded part and a third injection molded part, wherein the first injection molded part is located between the terminal plate and the top cover plate, the second injection molded part is located between the pole post and the top cover plate, and the third injection molded part is located between the substrate and the top cover plate.

9. The cylindrical power battery according to claim 6 or 7, characterized in that, A first insulating element is provided between the terminal block and the top cover plate, a second insulating element is provided between the substrate and the top cover plate, and a sealing element is provided between the pole and the top cover plate.

10. A battery module, characterized in that, It includes multiple cylindrical power batteries arranged side by side according to any one of claims 1 to 9.

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