Multi-tab battery capacitor

Abstract

The utility model relates to battery technical field especially relates to a kind of multi-pole ear battery capacitor, including roll core, positive cover group, negative cover group and shell. Roll core has multiple positive pole ear in one end of its own axial direction, roll core has multiple negative pole ear in the other end of its own axial direction, both ends of shell have opening, and roll core is located in shell. Positive cover group includes first cover plate and positive core column, first cover plate is covered and located in the opening of one end of shell, positive core column is insulated and passes through first cover plate and extends into shell, and the first end of positive core column in shell is electrically connected with positive pole ear. Negative cover group includes second cover plate and negative core column, second cover plate is covered and located in the opening of the other end of shell, negative core column is insulated and passes through second cover plate and extends into shell, and the second end of negative core column in shell is electrically connected with negative pole ear. Multiple positive pole ear and multiple negative pole ear are respectively arranged in both ends and directly connected with core column, can improve the flow effect, simplify assembly process.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a multi-tab battery capacitor. Background Technology

[0002] To improve rate performance, existing battery capacitors require an increased number of tabs. Common methods include a full-tab design with tabs at both ends of the core and a multi-tab design with both positive and negative tabs at the same end of the core. The full-tab design with tabs at both ends demands extremely high equipment precision and process control, resulting in high equipment costs, low cell yield, and poor electrolyte filling performance. The multi-tab design with both positive and negative tabs at the same end of the core ultimately relies on aluminum or nickel strips for output, requiring precise design of the positive and negative tab arrangement to prevent short circuits. However, this aluminum / nickel strip output method ultimately limits the range of high-current applications.

[0003] Therefore, there is an urgent need to design a multi-tab battery capacitor to solve the above technical problems. Utility Model Content

[0004] The purpose of this invention is to propose a multi-tab battery capacitor that has a simple manufacturing process and high current conduction effect.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A multi-tab battery capacitor is provided, comprising a core, a positive electrode cover group, a negative electrode cover group, and a housing. The core has multiple positive electrode tabs at one end of its own axial direction and multiple negative electrode tabs at the other end of its own axial direction. The housing has openings at both ends, and the core is located inside the housing.

[0007] The positive electrode cover assembly includes a first cover plate and a positive electrode core. The first cover plate is placed over one end opening of the housing. The positive electrode core is insulated through the first cover plate and extends into the housing. The first end of the positive electrode core located inside the housing is electrically connected to the positive electrode tab.

[0008] The negative electrode cover assembly includes a second cover plate and a negative electrode core. The second cover plate is placed over the opening at the other end of the housing. The negative electrode core extends into the housing through the second cover plate. The second end of the negative electrode core located inside the housing is electrically connected to the negative electrode ear.

[0009] Optionally, the positive electrode cover assembly further includes a first insulating member, a first mounting hole is provided on the first cover plate, the first insulating member is sleeved on the outer periphery of the positive electrode core, the positive electrode core passes through the first mounting hole, and the first insulating member is sandwiched between the positive electrode core and the first cover plate.

[0010] The negative electrode cover assembly also includes a second insulating component. The second cover plate is provided with a second mounting hole. The second insulating component is sleeved on the outer periphery of the negative electrode core column. The negative electrode core column passes through the second mounting hole. The second insulating component is sandwiched between the negative electrode core column and the second cover plate.

[0011] Optionally, a first limiting protrusion is provided circumferentially at the first end, and the first limiting protrusion presses against the first insulating member along the axial direction of the winding core, so that the first insulating member is fixed relative to the first cover plate;

[0012] A second limiting protrusion is provided circumferentially at the second end, and the second limiting protrusion presses against the second insulating member along the axial direction of the core, so that the second insulating member is fixed relative to the second cover plate.

[0013] Optionally, the positive electrode cover assembly further includes a third limiting protrusion ring, which is fixed to the third end of the positive electrode core located outside the housing. The third limiting protrusion ring presses against the first insulating member along the axial direction of the core, so that the first insulating member, the positive electrode core, and the first cover plate are relatively fixed.

[0014] The negative electrode cover assembly also includes a fourth limiting protrusion ring, which is fixed to the fourth end of the negative electrode core located outside the housing. The fourth limiting protrusion ring presses against the second insulating member along the axial direction of the core, so that the second insulating member, the negative electrode core, and the second cover plate are relatively fixed.

[0015] Optionally, the first end has a first end face and a first side face, and the positive electrode tab is electrically connected to the first end face or the first side face. The first end face is the end face of the positive electrode core located in the axial direction of the winding core, and the first side face is the side face of the positive electrode core located in the circumferential direction of the winding core.

[0016] And / or, the second end has a second end face and a second side face, the negative electrode tab is electrically connected to the second end face or the second side face, the second end face is the end face of the negative electrode core located in the axial direction of the winding core, and the second side face is the side face of the negative electrode core located in the circumferential direction of the winding core.

[0017] Optionally, the first end face and / or the first side face are welded to the positive electrode tab;

[0018] The second end face and / or the second side face are welded to the negative electrode tab.

[0019] Optionally, at least two of the positive tabs overlap radially in the winding core;

[0020] And / or, at least two of the negative electrode tabs overlap radially in the winding core.

[0021] Optionally, the core is formed by winding together a positive electrode sheet, a separator, and a negative electrode sheet, wherein the positive electrode tab is located at one end of the core extending beyond the separator in the axial direction, and the negative electrode tab is located at the other end of the core extending beyond the separator in the axial direction.

[0022] Optionally, the positive electrode sheet has a first coated area coated with positive electrode material and a first blank area uncoated with positive electrode material, and the first blank area is cut to form a plurality of positive electrode tabs;

[0023] The negative electrode sheet has a second coated area coated with negative electrode material and a second blank area uncoated with negative electrode material, and the second blank area is cut to form a plurality of negative electrode tabs.

[0024] Optionally, the first cover plate is provided with a liquid injection hole, which communicates with the inner cavity of the housing.

[0025] The beneficial effects of this utility model include at least the following:

[0026] This utility model provides a multi-tab battery capacitor, including a core, a positive electrode cover assembly, a negative electrode cover assembly, and a housing. The core has multiple positive electrodes at one end along its axial direction and multiple negative electrodes at the other end. The housing has openings at both ends, and the core is located inside the housing. The positive electrode cover assembly includes a first cover plate and a positive electrode post. The first cover plate covers one opening of the housing, and the positive electrode post insulatedly passes through the first cover plate and extends into the housing. The first end of the positive electrode post inside the housing is electrically connected to the positive electrodes. The negative electrode cover assembly includes a second cover plate and a negative electrode post. The second cover plate covers the other opening of the housing, and the negative electrode post insulatedly passes through the second cover plate and extends into the housing. The second end of the negative electrode post inside the housing is electrically connected to the negative electrodes. This multi-tab battery capacitor has multiple positive and multiple negative tabs at both ends of the core. The positive tabs can be electrically connected to the first end of the positive core post extending into the casing, and the negative tabs can be electrically connected to the second end of the negative core post extending into the casing. By directly welding the core tabs to the core posts, the current conduction effect is improved, and the welding process is simple, eliminating the complex processes of cutting and leveling required for conventional multi-tab batteries. Furthermore, since the core posts extend into the casing and connect to the core tabs, there is sufficient space between the core and the battery cover assembly, making electrolyte filling simpler and electrolyte removal more convenient. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the multi-tab battery capacitor provided in this embodiment of the utility model;

[0028] Figure 2 This is a cross-sectional view of the positive electrode cover assembly provided in this embodiment of the utility model;

[0029] Figure 3This is a schematic diagram of the structure of the positive electrode sheet provided in this embodiment of the utility model;

[0030] Figure 4 This is a schematic diagram of the negative electrode sheet provided in an embodiment of the present invention.

[0031] Figure Labels

[0032] 1. Core; 11. Positive electrode plate; 111. Positive electrode tab; 12. Negative electrode plate; 121. Negative electrode tab;

[0033] 2. Positive electrode cover assembly; 21. First cover plate; 211. Liquid injection hole; 22. Positive electrode core; 221. First limiting protrusion ring; 23. First insulating component; 24. Third limiting protrusion ring;

[0034] 3. Negative electrode cover assembly; 31. Second cover plate; 32. Negative electrode core column;

[0035] 4. Shell. Detailed Implementation

[0036] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] like Figures 1 to 4 As shown, this embodiment provides a multi-tab battery capacitor, including a core 1, a positive electrode cover group 2, a negative electrode cover group 3, and a housing 4. The core 1 has multiple positive electrode tabs 111 at one end of its axial direction and multiple negative electrode tabs 121 at the other end of its axial direction. Both ends of the housing 4 have openings, and the core 1 is located inside the housing 4. The positive electrode cover group 2 includes a first cover plate 21 and a positive electrode core 22. The first cover plate 21 is placed over the opening at one end of the housing 4, and the positive electrode core 22 insulatedly passes through the first cover plate 21 and extends into the housing 4. The first end of the positive electrode core 22 located inside the housing 4 is electrically connected to the positive electrode tabs 111. The negative electrode cover group 3 includes a second cover plate 31 and a negative electrode core 32. The second cover plate 31 is placed over the opening at the other end of the housing 4, and the negative electrode core 32 insulatedly passes through the second cover plate 31 and extends into the housing 4. The second end of the negative electrode core 32 located inside the housing 4 is electrically connected to the negative electrode tabs 121. The multi-tab battery capacitor provided in this embodiment has multiple positive tabs 111 and multiple negative tabs 121 at both ends of the core 1. The multiple positive tabs 111 can be electrically connected to the first end of the positive electrode post 22 extending into the housing 4, and the multiple negative tabs 121 can be electrically connected to the second end of the negative electrode post 32 extending into the housing 4. By directly welding the tabs of the core 1 to the post, the current conduction effect can be improved, and the welding process is simple, avoiding the complex processes of cutting and leveling conventional full-tab systems. Furthermore, since the posts all extend into the housing 4 and connect to the tabs of the core 1, there is a certain space between the core 1 and the battery cover assembly, making liquid injection simpler and liquid aspiration more convenient.

[0042] In this embodiment, the first cover plate 21 is provided with a liquid injection hole 211, which is connected to the inner cavity of the shell 4.

[0043] Optionally, the positive electrode cover assembly 2 further includes a first insulating member 23. A first mounting hole is provided on the first cover plate 21. The first insulating member 23 is sleeved on the outer periphery of the positive electrode core 22, and the positive electrode core 22 passes through the first mounting hole. The first insulating member 23 is sandwiched between the positive electrode core 22 and the first cover plate 21. In this embodiment, the first insulating member 23 may be made of rubber. The first insulating member 23 is sandwiched between the positive electrode core 22 and the inner wall of the first mounting hole. The first insulating member 23 can deform to ensure the assembly sealing of the first mounting hole and the positive electrode core 22.

[0044] The negative electrode cover assembly 3 also includes a second insulating element. A second mounting hole is provided on the second cover plate 31. The second insulating element is sleeved on the outer periphery of the negative electrode core 32, which passes through the second mounting hole. The second insulating element is sandwiched between the negative electrode core 32 and the second cover plate 31. In this embodiment, the second insulating element can be made of rubber. The second insulating element is sandwiched between the inner wall of the negative electrode core 32 and the second mounting hole. The second insulating element can deform to ensure the sealing of the assembly between the second mounting hole and the negative electrode core 32.

[0045] Optionally, a first limiting protrusion 221 is provided circumferentially at the first end. The first limiting protrusion 221 presses against the first insulating member 23 along the axial direction of the core 1, so that the first insulating member 23 is relatively fixed to the first cover plate 21. In this embodiment, the first insulating member 23 includes a first middle section and a first inner section connected to each other. The first middle section passes through the first mounting hole, and the first inner section is located outside the first mounting hole and inside the housing 4. The first inner section has an annular structure, and the cross-sectional area of ​​the first inner section in the axial direction of the core 1 is larger than the cross-sectional area of ​​the first end of the positive electrode core 22 in the axial direction of the core 1, so as to isolate the positive electrode core 22 and the first cover plate 21.

[0046] A second limiting protrusion is provided circumferentially at the second end. The second limiting protrusion presses against the second insulating member along the axial direction of the core 1, so that the second insulating member is relatively fixed to the second cover plate 31. In this embodiment, the second insulating member includes a second middle section and a second inner section connected together. The second middle section passes through the second mounting hole, and the second inner section is located outside the second mounting hole and inside the housing 4. The second inner section has an annular structure, and the cross-sectional area of ​​the second inner section in the axial direction of the core 1 is larger than the cross-sectional area of ​​the second end of the negative electrode core 32 in the axial direction of the core 1, so as to isolate the negative electrode core 32 and the second cover plate 31.

[0047] Optionally, the positive electrode cover assembly 2 further includes a third limiting protrusion ring 24, which is fixed to the third end of the positive electrode core 22 located outside the housing 4. The third limiting protrusion ring 24 presses against the first insulating member 23 along the axial direction of the core 1, so that the first insulating member 23, the positive electrode core 22, and the first cover plate 21 are relatively fixed. In this embodiment, the third limiting protrusion ring 24 can be fixed to the third end of the positive electrode core 22 by riveting, so as to form an annular protrusion ring larger than the first mounting hole at the third end of the positive electrode core 22. This can ensure that the two ends of the positive electrode core 22 are located on both sides of the first mounting hole, thus ensuring the assembly stability of the positive electrode core 22 and the first cover plate 21. The third limiting protrusion ring 24 can be made of annular copper. The first insulating component 23 also includes a first outer section connected to the first middle section. The first outer section is located outside the first mounting hole and outside the housing 4. The first outer section is annular. The cross-sectional area of ​​the first outer section in the axial direction of the core 1 is greater than the cross-sectional area of ​​the third end of the positive electrode core 22 in the axial direction of the core 1, so as to isolate the positive electrode core 22 and the first cover plate 21.

[0048] The negative electrode cover assembly 3 also includes a fourth limiting protrusion ring, which is fixed to the fourth end of the negative electrode core 32 located outside the housing 4. The fourth limiting protrusion ring presses against the second insulating member along the axial direction of the core 1, so that the second insulating member, the negative electrode core 32, and the second cover plate 31 are relatively fixed. In this embodiment, the fourth limiting protrusion ring can be fixed to the fourth end of the negative electrode core 32 by riveting, so that an annular protrusion ring larger than the second mounting hole is formed at the fourth end of the negative electrode core 32. This can ensure that the two ends of the negative electrode core 32 are located on both sides of the second mounting hole, thus ensuring the assembly stability of the negative electrode core 32 and the second cover plate 31. The fourth limiting protrusion ring can be made of an annular copper part. The second insulating member also includes a second outer section connected to the second middle section. The second outer section is located outside the second mounting hole and outside the housing 4. The second outer section is an annular structure. The cross-sectional area of ​​the second outer section in the axial direction of the core 1 is larger than the cross-sectional area of ​​the fourth end of the negative electrode core 32 in the axial direction of the core 1, so as to isolate the negative electrode core 32 and the fourth cover plate.

[0049] Optionally, the first end has a first end face and a first side face. The positive electrode tab 111 is electrically connected to the first end face or the first side face. The first end face is the end face of the positive electrode core 22 located in the axial direction of the winding core 1, and the first side face is the side face of the positive electrode core 22 located in the circumferential direction of the winding core 1. In specific implementations, the positive electrode tab 111 can be connected to multiple planes of the first end, that is, the positive electrode core 22 has multiple positions for connecting to the positive electrode tab 111, which facilitates the connection of multiple positive electrode tabs 111 to the positive electrode core 22.

[0050] The second end has a second end face and a second side face. The negative electrode tab 121 is electrically connected to the second end face or the second side face. The second end face is the end face of the negative electrode core 32 located in the axial direction of the winding core 1, and the second side face is the side face of the negative electrode core 32 located in the circumferential direction of the winding core 1. In specific implementation, the negative electrode tab 121 can be connected to multiple planes of the second end, that is, there are many positions for the negative electrode core 32 to be connected to the negative electrode tab 121, which facilitates the connection of multiple negative electrode tabs 121 to the negative electrode core 32.

[0051] Optionally, the first end face and / or the first side face are welded to the positive electrode tab 111. The second end face and / or the second side face are welded to the negative electrode tab 121. The welding of the electrode tab to the electrode post can be one or more of ultrasonic welding, laser welding, and resistance welding.

[0052] In this embodiment, the core 1 is formed by winding together a positive electrode sheet 11, a diaphragm, and a negative electrode sheet 12. The positive electrode tab 111 is located at one end of the core 1 that extends beyond the diaphragm in the axial direction, and the negative electrode tab 121 is located at the other end of the core 1 that extends beyond the diaphragm in the axial direction.

[0053] Optionally, such as Figure 3 As shown, the positive electrode 11 has a first coated area coated with positive electrode material and a first blank area uncoated with positive electrode material. The first blank area is cut to form a plurality of positive electrode tabs 111. The plurality of positive electrode tabs 111 are arranged at intervals along the length direction of the positive electrode 11, and the spacing between two adjacent positive electrode tabs 111 may be unequal.

[0054] Optionally, at least two positive tabs 111 overlap radially in the core 1. Multiple positive tabs 111 are spaced apart along the length of the positive electrode sheet 11. The spacing between two adjacent positive tabs 111 may not be equal, and the spacing between two adjacent positive tabs 111 may gradually increase along the length extension direction of the positive electrode sheet 11. Then, when the positive electrode sheet 11 is wound, the positive tabs 111 located on the inner ring of the core 1 can overlap radially with the positive tabs 111 located on the outer ring of the core 1.

[0055] like Figure 4 As shown, the negative electrode sheet 12 has a second coated area coated with negative electrode material and a second blank area uncoated with negative electrode material. The second blank area is cut to form a plurality of negative electrode tabs 121. The plurality of negative electrode tabs 121 are spaced apart along the length direction of the negative electrode sheet 12, and the spacing between two adjacent negative electrode tabs 121 may be unequal.

[0056] Optionally, at least two negative electrode tabs 121 overlap radially in the core 1. Multiple negative electrode tabs 121 are spaced apart along the length of the negative electrode sheet 12. The spacing between two adjacent negative electrode tabs 121 may not be equal. The spacing between two adjacent negative electrode tabs 121 may gradually increase along the length extension direction of the negative electrode sheet 12. Then, when the negative electrode sheet 12 is wound, the negative electrode tabs 121 located on the inner ring of the core 1 can overlap radially with the negative electrode tabs 121 located on the outer ring of the core 1.

[0057] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-tab battery capacitor, characterized in that, The device includes a core (1), a positive electrode cover group (2), a negative electrode cover group (3), and a housing (4). The core (1) has multiple positive electrode tabs (111) at one end of its own axial direction and multiple negative electrode tabs (121) at the other end of its own axial direction. The housing (4) has openings at both ends and the core (1) is located inside the housing (4). The positive electrode cover assembly (2) includes a first cover plate (21) and a positive electrode core (22). The first cover plate (21) covers one end opening of the housing (4). The positive electrode core (22) insulates through the first cover plate (21) and extends into the housing (4). The first end of the positive electrode core (22) located in the housing (4) is electrically connected to the positive electrode tab (111). The negative electrode cover assembly (3) includes a second cover plate (31) and a negative electrode core (32). The second cover plate (31) covers the opening at the other end of the housing (4). The negative electrode core (32) extends into the housing (4) through the second cover plate (31) with insulation. The second end of the negative electrode core (32) located in the housing (4) is electrically connected to the negative electrode ear (121).

2. The multi-tab battery capacitor according to claim 1, characterized in that, The positive electrode cover assembly (2) further includes a first insulating element (23). A first mounting hole is provided on the first cover plate (21). The first insulating element (23) is sleeved on the outer periphery of the positive electrode core (22). The positive electrode core (22) passes through the first mounting hole. The first insulating element (23) is sandwiched between the positive electrode core (22) and the first cover plate (21). The negative electrode cover assembly (3) further includes a second insulating component. A second mounting hole is provided on the second cover plate (31). The second insulating component is sleeved on the outer periphery of the negative electrode core (32). The negative electrode core (32) passes through the second mounting hole. The second insulating component is sandwiched between the negative electrode core (32) and the second cover plate (31).

3. The multi-tab battery capacitor according to claim 2, characterized in that, A first limiting protrusion ring (221) is provided circumferentially at the first end. The first limiting protrusion ring (221) presses against the first insulating member (23) along the axial direction of the core (1) so that the first insulating member (23) is fixed relative to the first cover plate (21). A second limiting protrusion is provided circumferentially at the second end, and the second limiting protrusion presses against the second insulating member along the axial direction of the core (1) so that the second insulating member is fixed relative to the second cover plate (31).

4. The multi-tab battery capacitor according to claim 2, characterized in that, The positive electrode cover assembly (2) further includes a third limiting protrusion ring (24), which is fixed to the third end of the positive electrode core (22) located outside the housing (4). The third limiting protrusion ring (24) presses against the first insulating member (23) along the axial direction of the core (1) so that the first insulating member (23), the positive electrode core (22) and the first cover plate (21) are relatively fixed. The negative electrode cover assembly (3) further includes a fourth limiting protrusion ring, which is fixed to the fourth end of the negative electrode core (32) located outside the housing (4). The fourth limiting protrusion ring presses against the second insulating member along the axial direction of the core (1) so that the second insulating member, the negative electrode core (32) and the second cover plate (31) are relatively fixed.

5. The multi-tab battery capacitor according to claim 1, characterized in that, The first end has a first end face and a first side face. The positive electrode tab (111) is electrically connected to the first end face or the first side face. The first end face is the end face of the positive electrode core (22) located in the axial direction of the core (1). The first side face is the side face of the positive electrode core (22) located in the circumferential direction of the core (1). And / or, the second end has a second end face and a second side face, the negative electrode tab (121) is electrically connected to the second end face or the second side face, the second end face is the end face of the negative electrode core (32) located in the axial direction of the core (1), and the second side face is the side face of the negative electrode core (32) located in the circumferential direction of the core (1).

6. The multi-tab battery capacitor according to claim 5, characterized in that, The first end face and / or the first side face are welded to the positive electrode tab (111); The second end face and / or the second side face are welded to the negative electrode tab (121).

7. The multi-tab battery capacitor according to claim 1, characterized in that, At least two of the positive tabs (111) overlap radially in the core (1); And / or, at least two of the negative electrode tabs (121) overlap radially in the core (1).

8. The multi-tab battery capacitor according to claim 1, characterized in that, The core (1) is formed by winding together a positive electrode sheet (11), a diaphragm and a negative electrode sheet (12). The positive electrode tab (111) is located at one end of the core (1) that extends beyond the diaphragm in the axial direction, and the negative electrode tab (121) is located at the other end of the core (1) that extends beyond the diaphragm in the axial direction.

9. The multi-tab battery capacitor according to claim 8, characterized in that, The positive electrode sheet (11) has a first coated area coated with positive electrode material and a first blank area uncoated with positive electrode material, and the first blank area is cut to form a plurality of positive electrode tabs (111). The negative electrode sheet (12) has a second coated area coated with negative electrode material and a second blank area uncoated with negative electrode material, and the second blank area is cut to form a plurality of negative electrode tabs (121).

10. The multi-tab battery capacitor according to claim 1, characterized in that, The first cover plate (21) is provided with a liquid injection hole (211), which is connected to the inner cavity of the shell (4).

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