Square multi-pole column battery structure

Abstract

The utility model provides a square multi-pole column battery structure. The square multi-pole column battery structure comprises a cover plate and at least one battery cell unit, the cover plate comprises a cover plate body, a plurality of positive poles, a plurality of negative poles, an anti-explosion valve and a liquid injection hole; the anti-explosion valve is arranged at the geometric center of the cover plate body, the liquid injection hole is formed in the cover plate body, and the anti-explosion valve is adjacent to the liquid injection hole; the plurality of positive terminals and the plurality of negative terminals are arranged on the cover plate body, and the positive terminals and the negative terminals are alternately arranged; the battery cell unit comprises a plurality of positive plates and a plurality of negative plates; a plurality of positive tabs are arranged on one side of the positive plate, and a plurality of negative tabs are arranged on one side of the negative plate; when the positive plate and the negative plate are stacked, the positive tabs and the negative tabs are arranged on the same side, the positive tabs are connected with the positive columns in a one-to-one correspondence manner, and the negative tabs are connected with the negative columns in a one-to-one correspondence manner. The structure is uniform in current distribution and good in heat dissipation effect, and can be used for quick charging and quick discharging.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a square multi-pole battery structure. Background Art

[0002] Compared with traditional frequency regulation, energy storage systems have faster response rates, faster regulation rates, higher regulation accuracy, and stronger comprehensive frequency regulation capabilities. Therefore, after large-scale, high-proportion new energy and large-capacity DC access, facing the instantaneous fluctuations in power generation in the new system, energy storage systems can enable the power grid to have stronger flexible regulation capabilities and a safe and stable level.

[0003] At present, compared with traditional small-capacity batteries, large-capacity lithium-ion batteries above 300AH have the advantages of low cost and high production efficiency when replacing pumped storage. However, large-capacity batteries with traditional structures have problems such as uneven current distribution inside the electrode, poor heat dissipation, uneven heat distribution, and local temperature rise of the battery during the charging and discharging process, which makes the battery cycle life poor and greatly affects the battery cycle life. Utility Model Content

[0004] The utility model provides a square multi-pole battery structure, which aims to solve the problems of uneven current distribution inside the pole piece, poor heat dissipation, uneven heat distribution, and local temperature rise of the battery in the charging and discharging process of large-capacity batteries with traditional structures. The present application adopts a multi-pole structure, which has a simple structure, uniform current distribution of the pole piece, low heat generation during charging and discharging, and low internal resistance of the battery cell, and is particularly suitable for large-capacity batteries.

[0005] To achieve the above-mentioned purpose, the embodiment of the utility model provides a square multi-pole battery structure, including a cover plate and at least one battery cell unit;

[0006] The cover plate includes a cover plate body, a plurality of positive poles, a plurality of negative poles, an explosion-proof valve and a liquid injection hole; the explosion-proof valve is arranged at the geometric center of the cover plate body, the liquid injection hole is arranged on the cover plate body, and the explosion-proof valve is arranged adjacent to the liquid injection hole; the plurality of positive poles and the plurality of negative poles are arranged on the cover plate body, and the positive poles and the negative poles are arranged alternately;

[0007] The battery cell unit includes a plurality of positive electrode sheets and a plurality of negative electrode sheets, wherein a diaphragm is arranged between the positive electrode sheets and the negative electrode sheets; a plurality of positive electrode ears are arranged on one side of the positive electrode sheet, and a plurality of negative electrode ears are arranged on one side of the negative electrode sheet; when a plurality of the positive electrode sheets and a plurality of the negative electrode sheets are stacked, the positive electrode ears and the negative electrode ears are arranged on the same side, the positive electrode ears are connected to the positive electrode posts in a one-to-one correspondence, and the negative electrode ears are connected to the negative electrode posts in a one-to-one correspondence.

[0008] As a preferred embodiment, the cover body includes a top cover sheet, a first lower plastic and a second lower plastic, the first lower plastic and the second lower plastic abut against the side of the top cover sheet close to the battery cell unit; the first lower plastic and the second lower plastic are parallel and symmetrically arranged.

[0009] As a preferred embodiment, the top cover sheet is provided with a plurality of positive electrode column holes and a plurality of negative electrode column holes, and the positive electrode column holes and the negative electrode column holes are alternately arranged; the positive electrode column is arranged in the positive electrode column hole, and the positive electrode column and the positive electrode column hole are arranged in a one-to-one correspondence; the negative electrode column is arranged in the negative electrode column hole, and the negative electrode column and the negative electrode column hole are arranged in a one-to-one correspondence.

[0010] As a preferred embodiment, an explosion-proof valve hole is provided at the geometric center of the top cover sheet, and the explosion-proof valve is provided in the explosion-proof valve hole; a first semicircular groove is provided at one end of the first lower plastic close to the second lower plastic, and a second semicircular groove is provided at one end of the second lower plastic close to the first lower plastic, the first semicircular groove and the second semicircular groove are combined to form a circular groove, and the circular groove is provided below the explosion-proof valve hole.

[0011] As a preferred embodiment, a plurality of through holes are disposed in the first semicircular groove and the second semicircular groove.

[0012] As a preferred embodiment, the plurality of positive electrode tabs are independently arranged, and the plurality of negative electrode tabs are independently arranged; when a plurality of the positive electrode sheets and a plurality of the negative electrode sheets are stacked, the positive electrode tabs and the negative electrode tabs are alternately arranged.

[0013] As a preferred embodiment, the height of the positive electrode tab is the same as the height of the negative electrode tab.

[0014] As a preferred embodiment, the positive electrode ears at the same position on several of the positive electrode sheets constitute a positive electrode ear group, and the negative electrode ears at the same position on several of the negative electrode sheets constitute a negative electrode ear group; the positive electrode ear group is connected to the positive electrode column through a positive electrode connecting sheet; and the negative electrode ear group is connected to the negative electrode column through a negative electrode connecting sheet.

[0015] As a preferred embodiment, the positive electrode lug group is arranged in one-to-one correspondence with the positive electrode connecting sheet, and the positive electrode connecting sheet is arranged in one-to-one correspondence with the positive electrode column; the negative electrode lug group is arranged in one-to-one correspondence with the negative electrode connecting sheet, and the negative electrode connecting sheet is arranged in one-to-one correspondence with the negative electrode column.

[0016] As a preferred embodiment, when several positive electrode sheets and several negative electrode sheets are stacked, the positive electrode tabs at the same position on several positive electrode sheets are connected to each other to form a positive electrode tab group, and the negative electrode tabs at the same position on several negative electrode sheets are connected to each other to form a negative electrode tab group.

[0017] As a preferred embodiment, the positive electrode lug groups are provided in plurality, and the negative electrode lug groups are provided in plurality; the positive electrode lug groups and the negative electrode lug groups are arranged alternately; and the positive electrode lug groups and the negative electrode lug groups are arranged in a straight line from one end to the other end of the cover body.

[0018] As a preferred embodiment, the battery cell unit is a square wound battery cell or a square laminated battery cell; the square multi-pole battery structure is a lithium-ion battery structure or a sodium-ion battery structure.

[0019] The present application adopts a multi-pole ear and a multi-pole cover plate structure, and controls the pole ear and the pole to be matched and arranged, so that the battery cell forms an internal parallel connection, and the part of the current that generates the most heat during the charging and discharging process is arranged outside the battery, reducing the heat generated inside the battery during the charging and discharging process, and effectively solving the problems of uneven current distribution inside the pole piece, poor heat dissipation, uneven heat distribution, and local temperature rise of the battery in the charging and discharging process of large-capacity batteries with traditional structures. The present application adopts a multi-pole structure, which has a simple structure, uniform current distribution of the pole piece, low heat generation inside the battery during the charging and discharging process, and low internal resistance of the battery cell, which is particularly suitable for large-capacity batteries (large-capacity monomers above 300AH). BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of a square multi-electrode battery structure according to an embodiment of the present utility model;

[0022] Figure 2 for Figure 1 A schematic structural diagram of a cover plate of a square multi-electrode battery structure;

[0023] Figure 3 for Figure 2 Schematic diagram of the explosion structure of the cover plate;

[0024] Figure 4 for Figure 1 A schematic diagram of the structure of a cell unit of a square multi-electrode battery structure;

[0025] Figure 5 for Figure 1 A schematic diagram of the structure of the positive electrode sheet of a square multi-electrode battery structure;

[0026] Figure 6 for Figure 1 Schematic diagram of the structure of the negative electrode sheet of a square multi-pole battery structure. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0032] In the battery structure of the present application, the multiple pole ears are evenly distributed on the output ear side of the battery cell, which can make the current density distribution inside the battery cell more even, and then make the current heat generation inside the battery cell uniform, which can avoid the failure of active materials caused by local overheating of the battery cell during the cycle due to heat concentration, thereby effectively improving the cycle performance of the battery cell. At the same time, since the current density is evenly distributed, the risk of polarization of the battery cell during high current charging and discharging can be effectively reduced, thereby effectively improving the rate performance of the battery cell. The present application has a simple structure and can effectively solve the problem of large-capacity batteries with many new structural components and complex structural connections.

[0033] In the square multi-pole battery structure of the embodiment of the present application, the number of battery cell units can be set according to actual use needs, and can be set to one, two, three, four or even more.

[0034] Specifically, in this embodiment, a square multi-pole battery structure provided with two battery cell units is taken as an example to explain in detail the square multi-pole battery structure.

[0035] like Figures 1 to 6 As shown, the embodiment of the present application provides a square multi-pole battery structure, including a cover plate 10 and two battery cell units 20 (the two battery cell units are symmetrically arranged);

[0036] The cover plate 10 includes a cover plate body 11, a plurality of positive poles 12, a plurality of negative poles 13, an explosion-proof valve 14 and a liquid injection hole 15; the explosion-proof valve 14 is arranged at the geometric center of the cover plate body 11, the liquid injection hole 15 is arranged on the cover plate body 11, and the explosion-proof valve 14 is arranged adjacent to the liquid injection hole 15; the plurality of positive poles 12 and the plurality of negative poles 13 are all arranged on the cover plate body 11, and the positive poles 12 and the negative poles 13 are arranged alternately;

[0037] Each of the battery cell units 20 includes a plurality of positive electrode sheets 21 and a plurality of negative electrode sheets 22, and a diaphragm (not marked in the figure) is arranged between the positive electrode sheet 21 and the negative electrode sheet 22; a plurality of positive electrode ears 211 are arranged on one side of the positive electrode sheet 21, and a plurality of negative electrode ears 221 are arranged on one side of the negative electrode sheet 22; when a plurality of the positive electrode sheets 21 and a plurality of the negative electrode sheets 22 are stacked, the positive electrode ears 211 and the negative electrode ears 221 are arranged on the same side, the positive electrode ears 211 are connected to the positive electrode columns 12 in a one-to-one correspondence, and the negative electrode ears 221 are connected to the negative electrode columns 13 in a one-to-one correspondence.

[0038] In the present application, the battery cells are connected in parallel internally by using multiple pole tabs, and the cover plate can meet the use requirements by using an explosion-proof valve and a liquid injection hole. By setting a multi-pole cover plate, the pole tabs and poles are connected through a separate connecting piece, and the part with the largest current heat generation during charging and discharging is set outside the battery, reducing the heat generation inside the battery during charging and discharging, which can effectively prevent the local temperature inside the battery from rising.

[0039] As a preferred embodiment, the cover body 11 includes a top cover sheet 111, a first lower plastic 112 and a second lower plastic 113. The first lower plastic 112 and the second lower plastic 113 are in contact with the side of the top cover sheet 111 close to the battery cell unit 20. The first lower plastic 112 and the second lower plastic 113 are arranged in parallel and symmetrically. By arranging the symmetrical first lower plastic and the second lower plastic, the internal heat dissipation efficiency of the battery can be effectively improved, and the local temperature rise inside the battery can be prevented.

[0040] As a preferred embodiment, the top cover sheet 111 is provided with a plurality of positive pole holes A and a plurality of negative pole holes B, the positive pole holes A and the negative pole holes B are arranged alternately; the positive pole 12 is arranged in the positive pole hole A, the positive pole 12 is arranged one-to-one with the positive pole hole A; the negative pole 13 is arranged in the negative pole hole B, the negative pole 13 is arranged one-to-one with the negative pole hole B. By arranging multiple poles, the pole lugs are connected to the poles through a separate connecting sheet, and the part with the largest current heat generation during the charging and discharging process is arranged outside the battery, which effectively reduces the heat generation inside the battery during the charging and discharging process.

[0041] As a preferred embodiment, an explosion-proof valve hole C is provided at the geometric center of the top cover sheet 111, and the explosion-proof valve 14 is provided in the explosion-proof valve hole C; a first semicircular groove D is provided at one end of the first lower plastic 112 close to the second lower plastic 113, and a second semicircular groove E is provided at one end of the second lower plastic 113 close to the first lower plastic 112, and the first semicircular groove D and the second semicircular groove E are enclosed to form a circular groove, and the circular groove is provided below the explosion-proof valve hole C. By providing symmetrical first and second semicircular grooves, the internal heat dissipation efficiency of the battery can be effectively improved, and the local temperature rise inside the battery can be further prevented.

[0042] As a preferred embodiment, a plurality of through holes F are provided in both the first semicircular groove D and the second semicircular groove E. In this way, the internal heat dissipation efficiency of the battery can be further effectively improved, and local temperature rise inside the battery can be further prevented.

[0043] As a preferred embodiment, the plurality of positive tabs 211 are independently arranged, and the plurality of negative tabs 221 are independently arranged; when the plurality of positive sheets 21 and the plurality of negative sheets 22 are stacked, the positive tabs 211 and the negative tabs 221 are alternately arranged. In this way, the current density distribution inside the battery cell can be made more uniform, thereby making the current heat generation inside the battery cell uniform, and avoiding the failure of the active material caused by local overheating of the battery cell during the cycle due to heat concentration, thereby effectively improving the cycle performance of the battery cell. At the same time, due to the uniform distribution of current density, the risk of polarization of the battery cell during large current charging and discharging can be effectively reduced, thereby effectively improving the rate performance of the battery cell.

[0044] In this embodiment, the two battery cell units 20 are symmetrically arranged. The number of positive tabs 211 and negative tabs 221 can be set according to actual use needs, and can be set to two, three, four or even more. Specifically, in this embodiment, the number of positive tabs 211 of each positive electrode sheet 21 and the number of negative tabs 221 of each negative electrode sheet 22 are both three.

[0045] As a preferred embodiment, the height of the positive electrode tab 211 is the same as the height of the negative electrode tab 221. This is conducive to reducing the difficulty of connecting the components, making the connection between the components easy to achieve.

[0046] As a preferred embodiment, the positive tabs 211 at the same position on the positive electrode sheets 21 constitute a positive tab group G, and the negative tabs 221 at the same position on the negative electrode sheets 22 constitute a negative tab group H; the positive tab group G is connected to the positive electrode column 12 via a positive electrode connecting sheet 30; and the negative tab group H is connected to the negative electrode column 13 via a negative electrode connecting sheet 40.

[0047] Taking the positive electrode lugs at position X on a plurality of positive electrode sheets 211 (with the same specifications and sizes and the same stacking positions) as an example, the positive electrode lugs at the same position refer to the positive electrode lugs arranged at position X on each positive electrode sheet.

[0048] As a preferred embodiment, the positive electrode tab group G is arranged in a one-to-one correspondence with the positive electrode connecting sheet 30 (that is, the number and position of the positive electrode connecting sheet 30 correspond to the number and position of the positive electrode tab group G), and the positive electrode connecting sheet 30 is arranged in a one-to-one correspondence with the positive electrode column 12; the negative electrode tab group H is arranged in a one-to-one correspondence with the negative electrode connecting sheet 40, and the negative electrode connecting sheet 40 is arranged in a one-to-one correspondence with the negative electrode column 13.

[0049] As a preferred embodiment, when several of the positive electrode sheets 21 and several of the negative electrode sheets 22 are stacked, the positive electrode ears 211 at the same position on several of the positive electrode sheets 21 are interconnected to form a positive electrode ear group G, and the negative electrode ears 221 at the same position on several of the negative electrode sheets 22 are interconnected to form a negative electrode ear group H.

[0050] As a preferred embodiment, the positive electrode ear group G is provided in plurality, and the negative electrode ear group H is provided in plurality; the positive electrode ear group G and the negative electrode ear group H are arranged alternately; and the positive electrode ear group G and the negative electrode ear group H are arranged in a straight line from one end to the other end of the cover body 11. In this way, it is helpful to reduce the difficulty of connecting the components, making the connection between the components easy to achieve.

[0051] As a preferred embodiment, the battery cell unit 20 is a square wound battery cell or a square laminated battery cell; the square multi-pole battery structure is a lithium-ion battery structure or a sodium-ion battery structure. Specifically, in this embodiment, the battery cell unit 20 is a square laminated battery cell; the battery structure is a lithium-ion battery structure.

[0052] The present application adopts a multi-pole ear and a multi-pole cover plate structure, and controls the pole ear and the pole to be matched and arranged, so that the battery cell forms an internal parallel connection, and the part of the current that generates the most heat during the charging and discharging process is arranged outside the battery, reducing the heat generated inside the battery during the charging and discharging process, and effectively solving the problems of uneven current distribution inside the pole piece, poor heat dissipation, uneven heat distribution, and local temperature rise of the battery in the charging and discharging process of large-capacity batteries with traditional structures. The present application adopts a multi-pole structure, which has a simple structure, uniform current distribution of the pole piece, low heat generation inside the battery during the charging and discharging process, and low internal resistance of the battery cell, which is particularly suitable for large-capacity batteries (large-capacity monomers above 300AH).

[0053] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0054] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A square multi-pole battery structure, characterized in that: comprising a cover plate and at least one battery cell unit; The cover plate includes a cover plate body, a plurality of positive poles, a plurality of negative poles, an explosion-proof valve and a liquid injection hole; the explosion-proof valve is arranged at the geometric center of the cover plate body, the liquid injection hole is arranged on the cover plate body, and the explosion-proof valve is arranged adjacent to the liquid injection hole; the plurality of positive poles and the plurality of negative poles are arranged on the cover plate body, and the positive poles and the negative poles are arranged alternately; The battery cell unit includes a plurality of positive electrode sheets and a plurality of negative electrode sheets, wherein a diaphragm is arranged between the positive electrode sheets and the negative electrode sheets; a plurality of positive electrode ears are arranged on one side of the positive electrode sheet, and a plurality of negative electrode ears are arranged on one side of the negative electrode sheet; when a plurality of the positive electrode sheets and a plurality of the negative electrode sheets are stacked, the positive electrode ears and the negative electrode ears are arranged on the same side, the positive electrode ears are connected to the positive electrode posts in a one-to-one correspondence, and the negative electrode ears are connected to the negative electrode posts in a one-to-one correspondence.

2. The square multi-pole battery structure according to claim 1, characterized in that: The cover plate body comprises a top cover sheet, a first lower plastic and a second lower plastic, wherein the first lower plastic and the second lower plastic abut against a side surface of the top cover sheet close to the battery cell unit; the first lower plastic and the second lower plastic are arranged in parallel and symmetrically.

3. The square multi-pole battery structure according to claim 2, characterized in that: The top cover sheet is provided with a plurality of positive pole column holes and a plurality of negative pole column holes, and the positive pole column holes are alternately arranged with the negative pole column holes; the positive pole column is arranged in the positive pole column hole, and the positive pole column and the positive pole column hole are arranged in a one-to-one correspondence; the negative pole column is arranged in the negative pole column hole, and the negative pole column and the negative pole hole are arranged in a one-to-one correspondence.

4. The square multi-pole battery structure according to claim 3, characterized in that: An explosion-proof valve hole is provided at the geometric center of the top cover sheet, and the explosion-proof valve is provided in the explosion-proof valve hole; a first semicircular groove is provided at one end of the first lower plastic close to the second lower plastic, and a second semicircular groove is provided at one end of the second lower plastic close to the first lower plastic, the first semicircular groove and the second semicircular groove are combined to form a circular groove, and the circular groove is provided below the explosion-proof valve hole.

5. The square multi-pole battery structure according to claim 4, characterized in that: A plurality of through holes are disposed in the first semicircular groove and the second semicircular groove.

6. The square multi-pole battery structure according to claim 1, characterized in that: The plurality of positive tabs are independently arranged, and the plurality of negative tabs are independently arranged; when a plurality of positive electrode sheets and a plurality of negative electrode sheets are stacked, the positive tabs and the negative tabs are alternately arranged; the height of the positive tab is the same as the height of the negative tab.

7. The square multi-pole battery structure according to claim 6, characterized in that: The positive electrode ears at the same position on the positive electrode sheets constitute a positive electrode ear group, and the negative electrode ears at the same position on the negative electrode sheets constitute a negative electrode ear group; the positive electrode ear group is connected to the positive electrode column through a positive electrode connecting sheet; and the negative electrode ear group is connected to the negative electrode column through a negative electrode connecting sheet.

8. The square multi-pole battery structure according to claim 7, characterized in that: The positive electrode lug group is arranged in one-to-one correspondence with the positive electrode connecting piece, and the positive electrode connecting piece is arranged in one-to-one correspondence with the positive electrode column; the negative electrode lug group is arranged in one-to-one correspondence with the negative electrode connecting piece, and the negative electrode connecting piece is arranged in one-to-one correspondence with the negative electrode column.

9. The square multi-pole battery structure according to claim 8, characterized in that: When the positive electrode sheets and the negative electrode sheets are stacked, the positive electrode tabs at the same position on the positive electrode sheets are connected to form a positive electrode tab group, and the negative electrode tabs at the same position on the negative electrode sheets are connected to form a negative electrode tab group.

10. The square multi-pole battery structure according to claim 9, characterized in that: There are a plurality of positive electrode lug groups, and a plurality of negative electrode lug groups; the positive electrode lug groups and the negative electrode lug groups are arranged alternately; from one end to the other end of the cover body, the positive electrode lug groups and the negative electrode lug groups are arranged in a straight line; The battery cell unit is a square wound battery cell or a square laminated battery cell; the square multi-pole battery structure is a lithium ion battery structure or a sodium ion battery structure.

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