CN219321571U

CN219321571U - Battery and electronic equipment

Info

Publication number: CN219321571U
Application number: CN202320832840.9U
Authority: CN
Inventors: 彭丽芳; 曹杰; 侯敏; 曹辉
Original assignee: Rept Battero Energy Co Ltd
Current assignee: Rept Battero Energy Co Ltd
Priority date: 2023-04-14
Filing date: 2023-04-14
Publication date: 2023-07-07
Anticipated expiration: 2033-04-14

Abstract

The utility model belongs to the technical field of power batteries, and discloses a battery and electronic equipment, wherein the electronic equipment comprises a battery, the battery comprises a shell, a top cover and a battery core assembly, and a positive pole and a negative pole are arranged on one side of the top cover at intervals; the battery cell assembly comprises a battery cell, an anode connecting wire and a cathode connecting wire, wherein the battery cell, the anode connecting wire and the cathode connecting wire are all arranged in the shell, the battery cell comprises a main body, the anode lug and the cathode lug are arranged on a first side surface and a second side surface of the main body, the anode lug on the first side surface is electrically connected to the anode post, the anode lug on the second side surface is electrically connected to the anode post through the anode connecting wire, the cathode lug on the first side surface is electrically connected to the cathode post, and the cathode lug on the second side surface is electrically connected to the cathode post through the cathode connecting wire. The structure can shorten the electron transfer distance in the battery cell, thereby reducing the internal resistance of the battery cell, further relieving the local overheating phenomenon generated during charging and discharging, and improving the safety.

Description

Battery and electronic equipment

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery and electronic equipment.

Background

At present, with the development of new energy automobiles, the requirements on the capacity and high-rate charge and discharge of a power battery are higher and higher, and the capacity of the battery can be adjusted by changing the size of a power core and the number of the power cores. The important factor affecting high-rate charge and discharge is internal resistance, and when the battery is charged and discharged, local heat generation is easy to occur at the tab, so that the safety of the battery is affected. The initial size of the internal resistance is mainly determined by the structural design, the raw material performance and the manufacturing process of the battery, and because the current of the positive/negative electrode plate of the battery core can flow out of the battery core only through the electrode lugs, when the battery core is increased, the conduction area and the distance of the current can be increased, and the flow guide resistance of the electrode lugs can be gradually increased along with the increase of the distance of the electrode lugs, so that the internal resistance of the battery is increased.

The prior patent application No. 201821668859.X describes a winding structure that reduces internal resistance and increases capacity of a cylindrical lithium battery. According to the lithium battery, the diaphragm of the outer ring of the winding core is changed into the negative copper foil end, so that the use of the diaphragm is reduced, meanwhile, the internal space of the winding core is saved, the internal resistance of the lithium battery is reduced in the subsequent use process, and the capacity of the battery is improved. However, the patent is effective only for cylindrical batteries, and has no obvious effect on soft packages and square batteries, namely, the application field of the method is narrow. Therefore, for other types of batteries, especially for multi-cell batteries, the problem of how to reduce the internal resistance of the battery still exists.

Therefore, there is a need to design a battery and an electronic device to solve the above technical problems.

Disclosure of Invention

The utility model aims to provide a battery, which can shorten the electron transfer distance in the battery core, thereby reducing the internal resistance of the battery core, further relieving the local overheating phenomenon generated during charging and discharging, improving the safety, and has simple manufacture and low cost.

To achieve the purpose, the utility model adopts the following technical scheme:

a battery, comprising:

a housing having an opening at one end thereof;

the top cover is arranged on the opening of the shell, and one side of the top cover, which is away from the shell, is provided with a positive pole column and a negative pole column at intervals;

the battery cell assembly comprises a battery cell, an anode connecting wire and a cathode connecting wire, wherein the battery cell, the anode connecting wire and the cathode connecting wire are all arranged in the shell, the battery cell comprises a main body, the main body is provided with a first side face and a second side face, anode lugs and cathode lugs are respectively extended out of the first side face and the second side face, the anode lugs on the first side face are electrically connected with the anode posts, the anode lugs on the second side face are electrically connected with the anode posts through the anode connecting wire, the cathode lugs on the first side face are electrically connected with the cathode posts, and the cathode lugs on the second side face are electrically connected with the cathode posts through the cathode connecting wire.

Optionally, the battery further includes a positive electrode tab and a negative electrode tab, where the positive electrode tab and the negative electrode tab are disposed at intervals, and the positive electrode tab on the first side is electrically connected to the positive electrode post through the positive electrode tab; the positive electrode connecting wire is electrically connected with the positive electrode post through the positive electrode rotating sheet; the negative electrode tab on the first side is electrically connected to the negative electrode post through the negative electrode switching piece; the negative electrode connection wire is electrically connected to the negative electrode post through the negative electrode tab.

Optionally, the positive electrode adapter piece includes a positive electrode tab connection portion, a positive electrode connection wire connection portion, and a positive electrode post connection portion; wherein the positive tab on the first side is electrically connected to the positive tab connection portion of the positive tab, the positive connection wire is electrically connected to the positive connection wire connection portion of the positive tab, and the positive tab is electrically connected to the positive post through the positive post connection portion;

the negative electrode adapter piece comprises a negative electrode lug connecting part, a negative electrode connecting lead connecting part and a negative electrode column connecting part; wherein the negative electrode tab on the first side is electrically connected to the negative electrode tab connection portion of the negative electrode tab, the negative electrode connection wire is electrically connected to the negative electrode connection wire connection portion of the negative electrode tab, and the negative electrode tab is electrically connected to the negative electrode post through the negative electrode post connection portion.

Optionally, the positive electrode connection wire and the positive electrode tab on the second side, the positive electrode connection wire and the positive electrode tab on the first side, the positive electrode tab and the positive electrode post, the negative electrode connection wire and the negative electrode tab on the second side, the negative electrode connection wire and the negative electrode tab, the negative electrode tab and the negative electrode tab on the first side, and the negative electrode tab and the negative electrode post are all welded together.

Optionally, the length of the positive electrode tab on the first side is the same as the length of the negative electrode tab and is a, and the length of the positive electrode tab on the second side is the same as the length of the negative electrode tab and is B; wherein a=b.

Optionally, the length of the positive electrode tab on the first side is the same as the length of the negative electrode tab and is a, and the length of the positive electrode tab on the second side is the same as the length of the negative electrode tab and is B; wherein A is equal to B.

Optionally, the length of the positive electrode tab on the first side is the same as the length of the negative electrode tab and is a, and the length of the positive electrode tab on the second side is the same as the length of the negative electrode tab and is B; wherein A > B.

Optionally, the main body includes two arc corner portions, the housing has a square structure, a gap is formed between the arc corner portions and the housing, and the positive electrode connection wire and the negative electrode connection wire are respectively disposed in the two gaps.

Optionally, an even number of the battery cells are provided, and the even number of the battery cells are arranged in parallel.

Another object of the present utility model is to provide an electronic device capable of ensuring high-rate charge and discharge while improving safety.

Electronic equipment comprises the battery.

The utility model has the beneficial effects that:

the utility model provides a battery and electronic equipment, which increase the number of tabs by arranging positive tabs and negative tabs on both sides of a battery core, so that electrons on a pole piece in the battery core can be divided into a plurality of small areas in the transfer process, namely, the original large area for transferring electrons is divided into a plurality of small areas for transferring electrons, and the electron transport path in the battery core is shortened, thereby greatly reducing the internal resistance of the battery core and further relieving the local overheating phenomenon generated during charge and discharge; meanwhile, even if the height of the battery core is further increased, the battery core is not limited by resistance, and the energy density of the battery is improved; and one side of the battery is provided with a pole column, so that the battery is convenient to assemble, the manufacturing is simple, and the manufacturing cost is reduced.

Drawings

Fig. 1 is a schematic view of a battery according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of an electron transfer path in a negative electrode sheet according to an embodiment of the present utility model.

In the figure:

11. a top cover; 111. a positive electrode post; 112. a negative electrode column; 12. a housing;

21. a battery cell; 211. a main body; 2111. a first side; 2112. a second side; 212. a positive electrode tab; 213. a negative electrode ear; 22. the positive electrode is connected with a wire; 23. the negative electrode is connected with a lead;

30. a positive electrode switching piece; 40. a negative electrode switching sheet.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The embodiment provides a battery, which can shorten the electron transfer distance inside the battery core 21, thereby reducing the internal resistance of the battery core 21, further relieving the local overheating phenomenon generated during charging and discharging, improving the safety, and has simple manufacture and low cost.

Specifically, as shown in fig. 1, the above-described battery includes a case 12, a top cover 11, and a cell assembly. One end of the shell 12 is provided with an opening, the battery cell assembly is positioned in the shell 12, and the top cover 11 is arranged on the opening of the shell 12; wherein, the surface of one side of the top cover 11 away from the shell 12 is provided with a positive pole 111 and a negative pole 112 at intervals, and the positive pole 111 and the negative pole 112 can be used for an output pole of the battery for outputting to the outside; the battery cell assembly comprises a battery cell 21, an anode connecting wire 22 and a cathode connecting wire 23, wherein the battery cell 21, the anode connecting wire 22 and the cathode connecting wire 23 are all arranged in a shell 12, the battery cell 21 comprises a main body 211, the main body 211 is provided with a first side 2111 and a second side 2112 which are oppositely arranged, an anode lug 212 and a cathode lug 213 are respectively extended out of the first side 2111 and the second side 2112 of the battery cell 21, the anode lug 212 on the first side 2111 is electrically connected with an anode column 111, the anode lug 212 on the second side 2112 is electrically connected with the anode column 111 through the anode connecting wire 22, the cathode lug 213 on the first side 2111 is electrically connected with a cathode column 112, and the cathode lug 213 on the second side 2112 is electrically connected with the cathode column 112 through the cathode connecting wire 23.

As shown in fig. 1 and 2, the battery of this embodiment, by arranging the positive electrode lug 212 and the negative electrode lug 213 on both sides of the battery core 21, increases the number of the electrode lugs, so that the electrons on the electrode plate inside the battery core 21 can be divided into a plurality of small areas in the transfer process, that is, the original large area for transferring electrons is divided into a plurality of small areas for transferring electrons, and shortens the electron transport path (the broken line in fig. 2 is divided small areas, and the arrow in fig. 2 is an electron transport path) inside the battery core 21, thereby greatly reducing the internal resistance of the battery core 21, and further alleviating the local overheating phenomenon generated during charging and discharging; meanwhile, even if the height of the battery cell 21 (namely the distance between the first side surface 2111 and the second side surface 2112) is further increased, the battery cell is not limited by resistance, and the energy density of the battery is improved; and the battery only has the pole at one side (namely, along the direction from the first side 2111 to the second side 2112, all poles of the battery are only positioned at one side of the battery), thereby facilitating the assembly of the battery, simplifying the manufacture and reducing the manufacturing cost.

Optionally, the positive electrode tab 212 and the negative electrode tab 213 on the same side are disposed at intervals, so that insulation between the positive electrode tab and the negative electrode tab can be achieved.

Illustratively, the positive tab 212 on the first side 2111 and the positive tab 212 on the second side 2112 are disposed opposite to each other, and the negative tab 213 on the first side 2111 and the negative tab 213 on the second side 2112 are disposed opposite to each other, so that the battery is more attractive.

In this embodiment, the battery cells 21 may be formed by winding and lamination, and are not particularly limited herein. Illustratively, the above-mentioned battery cell 21 is formed by negative pole piece, diaphragm, positive pole piece with the form of coiling, and the both sides of negative pole piece all are equipped with the bellying, can regard as two negative pole ears 213 of battery cell 21 after the coiling, and the both sides of positive pole piece all are equipped with the bellying, can regard as two positive pole ears 212 of battery cell 21 after the coiling, after forming battery cell 21, the bellying of positive pole piece and the bellying dislocation set of negative pole piece can realize that the positive pole ear 212 and the negative pole ear 213 interval setting of battery cell 21 same one side after the coiling have guaranteed the insulating setting of both.

Further, for example, the battery cell 21 is formed by winding, and the battery cell 21 includes two arc corner portions (the arc corner portions are R corner regions of the battery cell 21), and the housing 12 has a square structure. When the battery cell 21 is mounted to the case 12, a gap is formed between the arc-shaped corner portion of the battery cell 21 and the case 12 due to the square structure of the case 12, and the positive electrode connection wire 22 and the negative electrode connection wire 23 are respectively disposed in the gap. Therefore, the connecting wires are arranged in the gap between the arc corner portion and the housing 12, so that the space utilization rate is improved, the arrangement of the positive electrode connecting wires 22 and the negative electrode connecting wires 23 is ensured not to increase the volume of the battery housing 12, and the energy density of the battery can be ensured.

Still further, as shown in fig. 1, the battery further includes a positive electrode tab 30 and a negative electrode tab 40, the positive electrode tab 30 and the negative electrode tab 40 are disposed at intervals, and the positive tab 212 on the first side 2111 is electrically connected to the positive electrode post 111 through the positive electrode tab 30; the positive electrode connection wire 22 is electrically connected to the positive electrode post 111 through the positive electrode tab 30; the negative electrode tab 213 on the first side 2111 is electrically connected to the negative electrode post 112 through the negative electrode tab 40; the negative electrode connection wire 23 is electrically connected to the negative electrode post 112 through the negative electrode tab 40. The positive electrode rotating sheet 30 is arranged to realize electrical connection between the positive electrode column 111 and the positive electrode lug 212 of the first side surface 2111, and meanwhile, the positive electrode rotating sheet 30 is arranged to realize electrical connection between the positive electrode lug 212 of the second side surface 2112 and the positive electrode column 111; that is, the positive electrode tab 212 and the positive electrode connection wire 22 of the first side surface 2111 are electrically connected to the positive electrode tab 30, and the positive electrode tab 30 is electrically connected to the positive electrode post 111. The arrangement of the negative electrode switching piece 40 enables the negative electrode column 112 and the negative electrode lug 213 of the first side surface 2111 to be electrically connected, and meanwhile, the arrangement of the negative electrode switching piece 40 enables the negative electrode lug 213 of the second side surface 2112 and the negative electrode column 112 to be electrically connected; that is, the negative electrode tab 213 and the negative electrode connection wire 23 of the first side 2111 are both electrically connected to the negative electrode tab 40, and the negative electrode tab 40 is electrically connected to the negative electrode post 112; and further, the positive electrode lugs 212 of the battery cell assembly can be connected with the positive electrode posts 111, and the negative electrode lugs 213 can be connected with the negative electrode posts 112.

Specifically, the positive electrode tab 30 includes a positive electrode tab connection portion, a positive electrode connection wire connection portion, and a positive electrode post connection portion; wherein the positive tab 212 on the first side 2111 is electrically connected to the positive tab connection portion of the positive tab 30, the positive connection wire 22 is electrically connected to the positive connection wire connection portion of the positive tab 30, and the positive tab 30 is electrically connected to the positive post 111 through the positive post connection portion; the negative electrode tab 40 includes a negative electrode tab connection portion, a negative electrode connection wire connection portion, and a negative electrode post connection portion; wherein the negative electrode tab 213 on the first side 2111 is electrically connected to the negative electrode tab connection portion of the negative electrode tab 40, the negative electrode connection wire 23 is electrically connected to the negative electrode connection wire connection portion of the negative electrode tab 40, and the negative electrode tab 40 is electrically connected to the negative electrode post 112 through the negative electrode post connection portion.

Through the above arrangement, the positive electrode tab 30 can realize the function that the positive electrode tab 212 of the battery cell assembly can be electrically connected with the positive electrode column 111, and the negative electrode tab 40 can realize the function that the negative electrode tab 213 of the battery cell assembly can be electrically connected with the negative electrode column 112.

Alternatively, the positive electrode connection wire 22 is connected to the positive electrode tab 212 on the second side surface 2112, the positive electrode connection wire 22 is connected to the positive electrode tab 30, the positive electrode tab 212 on the first side surface 2111 is connected to the positive electrode tab 30, the positive electrode tab 30 is connected to the positive electrode post 111, the negative electrode connection wire 23 is connected to the negative electrode tab 213 on the second side surface 2112, the negative electrode connection wire 23 is connected to the negative electrode tab 40, the negative electrode tab 213 on the first side surface 2111 is connected to the negative electrode tab 40, and the negative electrode tab 40 is connected to the negative electrode post 112 by welding.

Preferably, the welding mode comprises ultrasonic welding or laser welding, and the welding is firm and high in precision.

In an alternative embodiment, the length of the positive electrode tab 212 (i.e., the length of the positive electrode tab 212 extending out of the main body 211) and the length of the negative electrode tab 213 (i.e., the length of the negative electrode tab 213 extending out of the main body 211) of the first side 2111 are the same and have a length a, and the length of the positive electrode tab 212 and the length of the negative electrode tab 213 of the second side 2112 are the same and have a length B; wherein a=b. That is, the lengths of the tabs of the battery cells 21 are equal, so that the tabs can be conveniently cut, and the effect of reducing the internal resistance of the battery to the battery cells 21 is not affected.

In another alternative embodiment, the positive tab 212 and the negative tab 213 of the first side 2111 are the same length and are a, and the positive tab 212 and the negative tab 213 of the second side 2112 are the same length and are B; wherein A is equal to B. That is, the lengths of the tabs on the two sides of the battery cell 21 are not equal, and the effect of the battery on the reduction of the internal resistance of the battery cell 21 is not affected.

It is understood that the length of the tab can be changed according to actual requirements, and is not particularly limited herein.

Preferably, a > B, which can ensure the reduction of the internal resistance of the battery cell 21, and the above arrangement can reduce the area of the tab of the second side 2112 and save the manufacturing cost because the welding area between the tab of the first side 2111 and the adapter is larger and the welding area between the tab of the second side 2112 and the connecting wire is smaller.

In this embodiment, the number of the battery cells 21 is even, the even number of battery cells 21 are arranged in parallel, and the arrangement of the plurality of battery cells 21 increases the capacity and energy density of the battery. Illustratively, the cells 21 are provided with two, four, six, etc.

In an alternative embodiment, two battery cells 21 are provided in the battery, the two battery cells 21 are stacked along the thickness direction of the battery cells, the first side 2111 of the two battery cells 21 are located on the same side of the battery, so that two positive tabs 212 on the sides of the two battery cells 21 located on the same side of the battery are electrically connected, and two negative tabs 213 on the sides of the two battery cells 21 located on the same side of the battery are electrically connected, one positive connection wire 22 and one negative connection wire 23 are provided, two positive tabs 212 connected in parallel on the first side 2111 side are electrically connected to the positive post 111, and two positive tabs 212 connected in parallel on the second side 2112 side are electrically connected to the positive post 111 through the positive connection wire 22; the two parallel negative electrode tabs 213 on the first side 2111 side are electrically connected to the negative electrode column 112, and the two parallel negative electrode tabs 213 on the second side 2112 side are electrically connected to the negative electrode column 112 through the negative electrode connection wire 23. The reduction of the internal resistance of the battery can be realized without increasing the number of connecting wires.

In another alternative embodiment, four cells 21 are provided in the battery, and the embodiment of the battery structure in which the number of cells 21 is 4 is similar to that of the above-mentioned battery structure in which the number of cells is 2, which is not described herein again.

The internal resistance of the battery can be reduced by the aid of the device, the structure is simple, the assembly is convenient, and the redundant space is not occupied.

The present embodiment provides an electronic device, which may be, for example, any one of a battery module, a battery pack, a vehicle, and a ship, including the battery of any one of the above embodiments. The electronic equipment can improve the safety while guaranteeing high-rate charge and discharge by using the battery, and has all the beneficial effects of the battery, which are not repeated here.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. A battery, comprising:

a housing (12), one end of the housing (12) having an opening;

the top cover (11) is arranged on the opening of the shell (12), and a positive pole column (111) and a negative pole column (112) are arranged at intervals on one side of the top cover (11) away from the shell (12);

cell module, including cell (21), anodal connecting wire (22) and negative pole connecting wire (23), cell (21) anodal connecting wire (22) with negative pole connecting wire (23) all set up in shell (12), cell (21) include main part (211), main part (211) are equipped with first side (2111) and second side (2112), all stretch out anodal ear (212) and negative pole ear (213) on first side (2111) with on second side (2112), anodal ear (212) on first side (2111) electricity be connected in anodal post (111), anodal ear (212) on second side (2112) pass through anodal connecting wire (22) electricity be connected in anodal post (111), negative pole ear (213) electricity on first side (1) be connected in negative pole post (112), negative pole (213) on second side (2112) pass through electric wire (21123).

2. The battery according to claim 1, further comprising a positive tab (30) and a negative tab (40), the positive tab (212) on the first side (2111) being electrically connected by the positive tab (30) and the positive post (111); the positive electrode connecting wire (22) is electrically connected with the positive electrode post (111) through the positive electrode rotating sheet (30); -the negative ear (213) on the first side (2111) is electrically connected to the negative post (112) by the negative tab (40); the negative electrode connection wire (23) is electrically connected to the negative electrode post (112) via the negative electrode tab (40).

3. The battery according to claim 2, wherein the positive electrode tab (30) includes a positive electrode tab connection portion, a positive electrode connection lead connection portion, and a positive electrode post connection portion; wherein the positive tab (212) on the first side surface (2111) is electrically connected to the positive tab connection portion of the positive tab (30), the positive connection wire (22) is electrically connected to the positive connection wire connection portion of the positive tab (30), and the positive tab (30) is electrically connected to the positive post (111) through the positive post connection portion;

the negative electrode switching piece (40) comprises a negative electrode lug connection part, a negative electrode connection lead connection part and a negative electrode column connection part; wherein the negative electrode tab (213) on the first side (2111) is electrically connected to the negative electrode tab connection portion of the negative electrode tab (40), the negative electrode connection wire (23) is electrically connected to the negative electrode connection wire connection portion of the negative electrode tab (40), and the negative electrode tab (40) is electrically connected through the negative electrode post connection portion and the negative electrode post (112).

4. A battery according to claim 3, wherein between the positive electrode connection wire (22) and the positive electrode tab (212) on the second side surface (2112), between the positive electrode connection wire (22) and the positive electrode rotation tab (30), between the positive electrode tab (212) and the positive electrode rotation tab (30) on the first side surface (2111), between the positive electrode rotation tab (30) and the positive electrode post (111), between the negative electrode connection wire (23) and the negative electrode tab (213) on the second side surface (2112), between the negative electrode connection wire (23) and the negative electrode rotation tab (40), between the negative electrode tab (213) and the negative electrode rotation tab (40) on the first side surface (2111), and between the negative electrode rotation tab (40) and the negative electrode post (112) are all connected by welding.

5. The battery according to claim 1, wherein the length of the positive tab (212) of the first side (2111) is the same as the length of the negative tab (213) and is a, and the length of the positive tab (212) of the second side (2112) is the same as the length of the negative tab (213) and is B; wherein a=b.

6. The battery according to claim 1, wherein the length of the positive tab (212) of the first side (2111) is the same as the length of the negative tab (213) and is a, and the length of the positive tab (212) of the second side (2112) is the same as the length of the negative tab (213) and is B; wherein A is equal to B.

7. The battery according to claim 6, wherein the length of the positive tab (212) of the first side (2111) is the same as the length of the negative tab (213) and is a, and the length of the positive tab (212) of the second side (2112) is the same as the length of the negative tab (213) and is B; wherein A > B.

8. The battery according to claim 1, wherein the main body (211) includes two arc-shaped corner portions, the case (12) has a square structure, a gap is formed between the arc-shaped corner portions and the case (12), and the positive electrode connection wire (22) and the negative electrode connection wire (23) are respectively disposed in the two gaps.

9. The battery according to any one of claims 1-8, wherein an even number of the cells (21) are provided, the even number of the cells (21) being arranged in parallel.

10. Electronic device, characterized in that it comprises a battery according to any of claims 1-9.