CN217485520U

CN217485520U - Multi-cell secondary battery

Info

Publication number: CN217485520U
Application number: CN202221343398.5U
Authority: CN
Inventors: 武冬冬; 李恺
Original assignee: Jiangsu Zenergy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-09-23
Anticipated expiration: 2032-05-31

Abstract

The utility model provides a many electric core secondary battery relates to battery technical field, this many electric core secondary battery includes the top shell plate, electrode switching pin, a plurality of electric core main parts and a plurality of electrode connection piece, the range upon range of setting of a plurality of electric core main parts, the top shell plate sets up in a plurality of electric core main parts top, and be provided with and lead the electrode post, the tip of every electric core main part all is provided with utmost point ear, a plurality of electrode connection pieces correspond with a plurality of utmost point ears and are connected, the one end and the electrically conductive electrode post connection of electrode switching pin, the other end is provided with a plurality of mutual spaced electrode stabilizer blades, every electrode stabilizer blade is connected with one or two electrode connection pieces. Compared with the prior art, the utility model provides a many electric core secondary battery can realize the electricity under the circumstances of piling up of a plurality of electric cores and connect to electric core energy density has been promoted by a wide margin.

Description

Multi-cell secondary battery

Technical Field

The utility model relates to the technical field of batteries, particularly, relate to a many electric core secondary battery.

Background

The existing secondary battery has poor design space utilization rate and low energy density. At present, two schemes for improving the space utilization rate are provided, one scheme is to bend the lug after ultrasonic welding, and the other scheme is to weld the lug after the pin is directly welded.

The inventor researches and discovers that the size of the ultrasonic welding mark occupies the width of the battery, so that the space utilization rate of the battery is easily wasted, and the improvement of the energy density is not facilitated. Aiming at the situation, the existing solution has the advantages that the bendable pins are used for welding the bent pins and the lugs after the lugs are subjected to super-welding, and the welding marks are changed from being parallel to the pole pieces to being perpendicular, so that the width space is saved. Or the pin substrate is turned over after the pin substrate is welded with the lug, and the substrate is welded with the L-shaped welding block below the pole in a laser mode. No matter which kind of solution, all higher to the space requirement to be subject to installation space has adopted single switching piece to realize that the electricity between utmost point ear and the utmost point post is connected, leads to electric core to pile up quantity and receives great influence, only can realize piling up of single electric core or single electric core group, can't realize that many electric cores or many electric core group pile up the electricity under the condition and connect, be unfavorable for electric core energy density's promotion.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a many electric core secondary battery, its range upon range of setting and the electricity that can realize a plurality of electric cores are connected, are favorable to electric core energy density's promotion.

The embodiment of the utility model is realized like this:

in a first aspect, the utility model provides a many electric core secondary battery, including top coverboard, electrode switching pin, a plurality of electric core main parts and a plurality of electrode connection piece, it is a plurality of electricity core main part range upon range of setting, the top coverboard sets up a plurality of electricity core main part top to be provided with leads the electrode post, every the tip of electricity core main part all is provided with utmost point ear, and is a plurality of the electrode connection piece is with a plurality of utmost point ear corresponds and connects, the one end of electrode switching pin with lead the electrode post connection, the other end is provided with a plurality of mutual spaced's electrode stabilizer blade, every the electrode stabilizer blade is with one or two the electrode connection piece is connected.

In an optional implementation manner, each electrode support leg is provided with support leg expansion portions at two side edges along the width direction, each electrode connecting sheet is provided with a switching expansion portion at least one side edge along the width direction, each electrode support leg is correspondingly attached and connected with one or two electrode connecting sheets, and the support leg expansion portions and the corresponding switching expansion portions are attached, connected and turned over to be arranged on one side, away from the cell main body, of the electrode support legs or the electrode connecting sheets.

In an optional embodiment, the electrode adaptor pin includes a pin support plate and a pin bending plate that are integrally disposed, the pin support plate is disposed at an end of the plurality of electrical core bodies at an interval and has a plurality of electrode support legs, the pin bending plate is disposed at a top side edge of the pin support plate and is bent toward a direction close to the plurality of electrical core bodies, and the pin bending plate is connected to the conductive electrode post.

In an optional embodiment, the pin support plate is parallel to the end surface of the electric core main body, the electrode support legs are arranged at intervals, and the distance between two adjacent electrode support legs is greater than twice the width of the support leg expansion part.

In an alternative embodiment, the width of the leg extension is less than or equal to 1/2 of the width of the electrode leg.

In an alternative embodiment, the electrode legs have the same length, and the bottoms of the electrode legs are flush with each other, so that the leg extensions are arranged along the same straight direction.

In an alternative embodiment, the tabs on adjacent cell bodies are flush with each other.

In an alternative embodiment, the electrode legs have different lengths, and the bottoms of two adjacent electrode legs are arranged in a staggered manner, so that the leg expanding portions on the adjacent electrode legs are arranged in a staggered manner.

In an optional embodiment, the tabs on the adjacent cell main bodies are arranged in a staggered manner.

In an optional embodiment, a confluence connecting portion is further disposed on the pin supporting plate, the pin bending plate is connected to one side edge of the confluence connecting portion, the plurality of electrode support legs are disposed on the other side edge of the confluence connecting portion, and the width of the pin bending plate is smaller than that of the confluence connecting portion.

In an alternative embodiment, one side edge of each electrode connecting sheet is provided with the switching expansion part, two adjacent electrode connecting sheets are symmetrically arranged, and each electrode supporting leg is simultaneously connected with two electrode connecting sheets.

The utility model discloses beneficial effect includes:

the utility model provides a many electric core secondary battery, the range upon range of setting of a plurality of electric core main parts, the top shell board sets up in electric core main part top to be provided with the conducting electrode post, the tip of every electric core main part all is provided with utmost point ear, a plurality of utmost point ears correspond and connect a plurality of electrode connection pieces, and the one end and the conducting electrode post of electrode switching pin are connected, and the other end is provided with a plurality of mutual spaced electrode stabilizer blades, and every electrode stabilizer blade is connected with one or two electrode connection pieces, thereby has realized the electricity of a plurality of electric core main parts and has connected. Compared with the prior art, the utility model provides a many electric core secondary battery can realize the electricity under the circumstances of piling up of a plurality of electric cores and connect to electric core energy density has been promoted by a wide margin.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a multi-cell secondary battery according to a first embodiment of the present invention;

FIG. 2 is a schematic structural view of the electrode transfer pins and the electrode pads of FIG. 1 before welding;

FIG. 3 is a schematic view of the electrode transfer pin of FIG. 2;

FIG. 4 is a schematic view of the electrode transfer pins and the electrode pads of FIG. 1 after welding;

FIG. 5 is a schematic structural view of an electrode transfer pin and an electrode connecting piece before welding according to a second embodiment of the present invention;

fig. 6 is a schematic structural view of the electrode adapting pin and the electrode connecting piece after welding according to the second embodiment of the present invention.

An icon:

100-multi-cell secondary battery; 110-top shell plate; 111-conductive electrode columns; 120-electrode transfer pins; 121-pin support plate; 123-pin bending plate; 125-a bus connection; 130-a cell body; 131-a tab; 140-electrode connection pads; 141-a transfer expansion section; 150-electrode feet; 151-leg extension; 160-cell casing.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

First embodiment

Referring to fig. 1 to 4, the present embodiment provides a multi-cell secondary battery 100, which can achieve electrical connection under the condition of stacking a plurality of cells, thereby greatly improving the cell energy density. Meanwhile, the supporting area during compression can be increased, short circuit or reverse insertion of the tabs is avoided, the bending process after welding is simple, the bending and tearing phenomena are not prone to occurring, and the quality of the battery cell is improved.

The multi-cell secondary battery 100 provided in this embodiment includes a top case plate 110, electrode adapting pins 120, a plurality of cell main bodies 130, and a plurality of electrode connecting sheets 140, wherein the plurality of cell main bodies 130 are stacked, the top case plate 110 is disposed above the plurality of cell main bodies 130 and is provided with a conductive electrode post 111, a tab 131 is disposed at an end of each cell main body 130, the plurality of electrode connecting sheets 140 are correspondingly connected to the plurality of tabs 131, one end of each electrode adapting pin 120 is connected to the conductive electrode post 111, a plurality of electrode supporting legs 150 spaced from each other are disposed at the other end of each electrode adapting pin 120, and each electrode supporting leg 150 is connected to one or two electrode connecting sheets 140.

In this embodiment, the plurality of cell main bodies 130 are stacked, and the specification and size of the plurality of cell main bodies 130 are the same, tabs 131 are disposed at two ends of each cell main body 130, meanwhile, two electrode adapting pins 120 are provided, a plurality of electrode connecting sheets 140 are respectively disposed at two ends of each cell main body 130, two electrode posts 111 are disposed on the top cover plate, the two electrode adapting pins 120 are respectively connected with the two electrode posts 111, in this embodiment, only the electrode adapting pin 120 at one end and the plurality of electrode connecting sheets 140 corresponding thereto are taken as an example for explanation, and the structures at the other end are the same.

In this embodiment, each electrode leg 150 is provided with leg extensions 151 at two side edges along the width direction, each electrode connecting sheet 140 is provided with a switching extension 141 at least one side edge along the width direction, each electrode leg 150 is correspondingly attached to one or two electrode connecting sheets 140, and the leg extensions 151 and the corresponding switching extensions 141 are attached to each other and folded and disposed on one side of the electrode leg 150 or the electrode connecting sheet 140 away from the cell main body 130.

In actual installation, the electrode adapter pins 120 and the tabs 131 are first welded together in the same manner as the conventional tabs 131. Then, the electrode transfer pin 120 and the conductive electrode column 111 are welded, and finally, the electrode transfer pin 120 and the electrode connecting sheet 140 are welded. During actual welding, firstly, the leg expanding portion 151 and the transfer expanding portion 141 are both in an unbent state, as shown in the figure, the electrode connecting sheet 140 is attached to one of the electrode legs 150 on the electrode transfer pin 120, at the moment, the leg expanding portion 151 and the transfer expanding portion 141 are also in an attached state, and through the additionally arranged leg expanding portion 151 and the transfer expanding portion 141, the supporting area between two welding objects during welding is increased. After the lamination is completed, welding is performed between the electrode connecting sheet 140 and the electrode support leg 150, and between the support leg expanding part 151 and the switching expanding part 141, and then the support leg expanding part 151 and the switching expanding part 141 are turned over and arranged on one side of the electrode connecting pin or the electrode support leg 150 far away from the battery cell main body 130, so that the welding action is completed, only the support leg expanding part 151 and the switching expanding part 141 are turned over and do not need to turn over the whole electrode connecting sheet 140 or the whole electrode support leg 150, so that the turning difficulty is small, the bending range is small, the bending process is simple, the bending and tearing phenomenon is not easily caused, and the improvement of the battery cell quality is facilitated.

In this embodiment, the electrode leg 150 of the electrode connection pin and the electrode connection sheet 140, and the electrode connection pin and the conductive electrode column 111 are all welded, and may be a laser welding or ultrasonic welding process, which is not limited herein.

In this embodiment, a through expansion 141 is disposed at one side edge of each electrode connecting sheet 140, two adjacent electrode connecting sheets 140 are symmetrically disposed, and each electrode leg 150 is connected to two electrode connecting sheets 140 at the same time. Specifically, the via extension 141 is integrally provided at one side edge of the electrode connecting tab 140, while the leg extensions 151 are integrally provided on the electrode legs 150. Each electrode connecting sheet 140 corresponds to one cell main body 130, and a joint area is arranged on one side surface of each electrode connecting sheet 140 away from the cell main body 130, and the tabs 131 are folded and attached to the joint area. The tab 131 is located at an end of the cell main body 130, and adopts a foil structure. In this embodiment, the tab 131 is folded from the bottom side of the electrode connecting sheet 140 and enters the junction region, and is welded to the junction region at the same time, so as to ensure a good electrical connection effect and avoid a short circuit between the tab 131 and the cell main body 130. Meanwhile, two adjacent electrode connecting sheets 140 are arranged in parallel at intervals and symmetrically, so that one side edge of each two adjacent electrode connecting sheets 140 away from each other is provided with a switching expansion part 141, the two electrode connecting sheets 140 are correspondingly connected with one electrode supporting leg 150, the supporting leg expansion parts 151 on the two side edges of the electrode supporting leg 150 are correspondingly connected with the switching expansion parts 141 on the two electrode connecting sheets 140 respectively, the turning welding is realized, and the stacking number of the cell main bodies 130 is further increased.

Of course, in other preferred embodiments of the present invention, each electrode leg 150 may correspond to a single electrode connecting piece 140, so as to realize a one-to-one correspondence, thereby ensuring the electrical connection effect.

In this embodiment, the multi-cell secondary battery 100 may further include a cell casing 160, a plurality of cell main bodies 130 are all accommodated in the cell casing 160, and the top casing plate 110 is covered on the cell casing 160, so as to form a complete battery structure.

In this embodiment, the electrode adapting pin 120 includes a pin support plate 121 and a pin bending plate 123 that are integrally disposed, the pin support plate 121 is disposed at the end of the plurality of cell main bodies 130 at an interval, and has a plurality of electrode support legs 150, the pin bending plate 123 is disposed at the top edge of the pin support plate 121 and is bent toward a direction close to the plurality of cell main bodies 130, and the pin bending plate 123 is connected to the conductive electrode column 111. Specifically, pin support plate 121 and pin bending plate 123 are 90 degrees of bending settings for the cross-section of electrode switching pin 120 is the L font, and pin support plate 121 and pin bending plate 123 are the slice, and pin support plate 121 sets up along vertical direction to parallel with the terminal surface of electric core main part 130, the pin bending portion sets up along the horizontal direction, and parallels with top shell plate 110. A plurality of electrode stabilizer blades 150 set up on pin support plate 121, and pin support plate 121 sets up with electric core main part 130 interval to avoid appearing the short circuit risk.

In this embodiment, the pin supporting plate 121 is further provided with a converging connecting portion 125, the pin bending plate 123 is connected to one side edge of the converging connecting portion 125, the plurality of electrode legs 150 are disposed on the other side edge of the converging connecting portion 125, and the width of the pin bending plate 123 is smaller than the width of the converging connecting portion 125. Specifically, the pin support plate 121 is composed of a bus connection portion 125 and a plurality of electrode support legs 150, and by providing the bus connection portion 125, the centralized bus of a plurality of connection pins can be realized, and meanwhile, the pin bending plate 123 can be made narrower, and the pin bending plate is more favorable for being welded on the conductive electrode column 111.

In other preferred embodiments of the present invention, the pin supporting plate 121 can also be formed by only a plurality of electrode supporting legs 150, and the plurality of electrode supporting legs 150 are directly connected to the pin bending plate 123, so as to achieve the effect of converging, and at this time, the pin bending plate 123 is wider, so as to ensure that the pin bending plate is connected to the plurality of electrode supporting legs 150.

It should be noted that in this embodiment, two electrode legs 150 are disposed on the electrode connecting sheet 140, two side edges of each electrode leg 150 are each provided with a leg expanding portion 151, and meanwhile, the number of the cell main bodies 130 is 4, the 4 cell main bodies 130 are stacked, each cell main body 130 is correspondingly connected with one electrode connecting sheet through a tab 131, the number of the electrode connecting sheets 140 is 4, and the electrode connecting sheets are arranged in two-to-two symmetry, and each electrode leg 150 is connected with two electrode connecting sheets 140 at the same time. Of course, the numbers of the electrode pins, the cell body 130 and the electrode connecting pieces 140 are only given by way of example and do not serve any limiting purpose.

In this embodiment, the pin support plate 121 is disposed parallel to the end surface of the cell main body, the electrode legs 150 are disposed at intervals, and the distance between two adjacent electrode legs 150 is greater than twice the width of the leg expanding portion 151. Specifically, the two electrode legs 150 are spaced apart from each other, and a required distance is formed between the two electrode legs 150, so that when the electrode is in the tiled state shown in fig. 2, the leg extensions 151 on the two adjacent electrode legs 150 do not interfere with each other, and the welding folding process is not affected.

In the present embodiment, the width of the leg expansion 151 is less than or equal to 1/2 of the width of the electrode leg 150. Specifically, the width of the leg expanding portion 151 is less than half of the width of the electrode leg 150, so that even after the leg expanding portion 151 is folded, the leg expanding portions 151 on both sides do not contact with each other to cause folding interference, which is beneficial to rapid welding folding of the leg expanding portion 151.

In the present embodiment, the electrode legs 150 have the same length, and the bottoms of the electrode legs 150 are flush with each other, so that the leg extensions 151 are disposed along the same straight direction. Specifically, the two electrode legs 150 have the same dimension, and the leg extensions 151 on the two electrode legs 150 have the same dimension, so that the 4 leg extensions 151 can be disposed along the same linear direction, and can be connected to the 4 electrode connection pads 140 in the same linear direction.

In this embodiment, the tabs 131 on adjacent cell bodies are flush. Specifically, the tabs 131 on the 4 cell main bodies are flush with each other, so that the joint areas on the plurality of electrode connecting sheets 140 can all be located on the same straight line, and welding is facilitated. In addition, the positions of the lugs 131 of the 4 battery cell main bodies are the same, so that the identity of the 4 battery cell main bodies is ensured, and the standardization and the rapid preparation of products are facilitated.

It should be noted that, the width direction mentioned in the present embodiment refers to a direction parallel to the thickness direction of the cell main body 130, i.e., a direction perpendicular to the large surface of the cell main body 130, and the length direction mentioned in the present embodiment refers to a direction parallel to the vertical direction.

In summary, in the multi-cell secondary battery 100 provided in this embodiment, the plurality of electrode legs 150 are disposed, the plurality of electrode connecting sheets 140 are correspondingly connected to the plurality of electrode legs 150, and the plurality of connecting sheets are correspondingly connected to the tabs 131 of the plurality of cell main bodies 130, so that the electrical connection of the plurality of cell main bodies 130 is realized, and the plurality of cell main bodies 130 are stacked in the casing, so that the electrical connection of the plurality of cells in the stacking condition can be realized, and the cell energy density is greatly improved. In addition, the support area between two welding objects is increased by the additional arrangement of the leg expanding part 151 and the transfer expanding part 141. After the lamination is completed, welding is performed between the electrode connecting sheet 140 and the electrode supporting leg 150, and welding is performed between the supporting leg expanding portion 151 and the switching expanding portion 141, then the supporting leg expanding portion 151 and the switching expanding portion 141 are turned over and arranged on one side, far away from the cell main body 130, of the electrode supporting leg 150 or the electrode switching sheet, so that welding actions are completed, the whole electrode connecting sheet 140 or the whole electrode switching pins 120 do not need to be turned over due to the fact that only the supporting leg expanding portion 151 and the switching expanding portion 141 are turned over and folded, the turning over difficulty is small, tearing is not prone to occurring, the turning over range is small, the bending process is simple, the phenomenon of bending and tearing is not prone to occurring, and the quality of the cell is favorably improved.

Second embodiment

Referring to fig. 5 and 6 in combination, the present embodiment provides a multi-cell secondary battery 100, the basic structure and principle thereof and the technical effects thereof are the same as those of the first embodiment, and for the sake of brief description, reference may be made to the corresponding contents of the first embodiment where no part is mentioned in the present embodiment.

The embodiment provides a multi-cell secondary battery 100, which includes a top shell plate 110, electrode adapting pins 120, a plurality of cell main bodies 130 and a plurality of electrode connecting sheets 140, wherein the plurality of cell main bodies 130 are stacked, the top shell plate 110 is disposed above the plurality of cell main bodies 130 and is provided with a conductive electrode column 111, the end of each cell main body 130 is provided with a tab 131, the plurality of electrode connecting sheets 140 are correspondingly connected with the plurality of tabs 131, one end of each electrode adapting pin 120 is connected with the conductive electrode column 111, the other end of each electrode adapting pin is provided with a plurality of electrode supporting legs 150 spaced from each other, and each electrode supporting leg 150 is connected with one or two electrode connecting sheets 140. In this embodiment, each electrode leg 150 is provided with leg extensions 151 at two side edges along the width direction, each electrode connecting sheet 140 is provided with a transfer extension 141 at least one side edge along the width direction, each electrode leg 150 is correspondingly attached and connected to one or two electrode connecting sheets 140, and the leg extensions 151 and the corresponding transfer extensions 141 are attached, connected, and turned over and disposed on one side of the electrode legs 150 or the electrode connecting sheets 140 away from the cell main body 130.

In this embodiment, the electrode legs 150 have different lengths, and the bottoms of two adjacent electrode legs 150 are disposed in a staggered manner, so that the leg extensions 151 of the adjacent electrode legs 150 are disposed in a staggered manner. Specifically, the two electrode legs 150 have different lengths, so that the bottoms of the two electrode legs 150 are higher and lower, and the leg extensions 151 are also arranged in a staggered manner. This kind of arrangement can connect the electrode connection piece 140 of different heights, and the suitability is stronger.

In the present embodiment, the tabs 131 on the adjacent cell main bodies are arranged in a staggered manner. Specifically, the tabs 131 on at least two adjacent cell main bodies are arranged in a staggered manner, so that the welding positions of the tabs 131 can be staggered, mutual influence of a welding structure is avoided, and rapid welding turnover is facilitated. Meanwhile, the tabs 131 are arranged in a staggered manner, so that the battery cell main body 130 can be thinner, miniaturization of products is facilitated, and the energy density of the battery is further improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a many electric core secondary battery, its characterized in that, includes top coverboard, electrode switching pin, a plurality of electric core main parts and a plurality of electrode connection piece, and is a plurality of electric core main part is range upon range of to be set up, the top coverboard sets up a plurality of electric core main part top to be provided with leads the electrode post, every the tip of electric core main part all is provided with utmost point ear, and is a plurality of the electrode connection piece is with a plurality of utmost point ear corresponds and connects, the one end of electrode switching pin with it connects to lead the electrode post, and the other end is provided with a plurality of mutual spaced electrode stabilizer blades, every the electrode stabilizer blade is with one or two the electrode connection piece is connected.

2. The multi-cell secondary battery according to claim 1, wherein each of the electrode legs is provided with leg extensions at both side edges in the width direction, each of the electrode connection tabs is provided with a transfer extension at least one side edge in the width direction, each of the electrode legs is correspondingly attached to one or two of the electrode connection tabs, and the leg extensions and the corresponding transfer extensions are attached to each other and folded to be disposed on one side of the electrode legs or the electrode connection tabs away from the cell body.

3. The multi-cell secondary battery according to claim 2, wherein the electrode adapter pins include a pin support plate and a pin bending plate integrally disposed, the pin support plate is disposed at an end of the plurality of cell bodies at an interval and has a plurality of electrode support legs, the pin bending plate is disposed at a top edge of the pin support plate and is bent in a direction close to the plurality of cell bodies, and the pin bending plate is connected to the conductive electrode posts.

4. The multi-cell secondary battery according to claim 3, wherein the pin support plate is disposed parallel to an end surface of the cell main body, the plurality of electrode legs are disposed at intervals, and a distance between two adjacent electrode legs is greater than twice a width of the leg extension portion.

5. The multi-cell secondary battery according to claim 3, wherein the plurality of electrode legs are the same length, and the bottoms of the electrode legs are flush so that the plurality of leg extensions are arranged in the same linear direction.

6. The multi-cell secondary battery of claim 5, wherein the tabs on adjacent cell bodies are flush.

7. The multi-cell secondary battery according to claim 3, wherein the plurality of electrode legs are different in length, and the bottoms of two adjacent electrode legs are arranged in a staggered manner, so that the leg extensions on the adjacent electrode legs are arranged in a staggered manner.

8. The multi-cell secondary battery of claim 7, wherein the tabs on adjacent cell bodies are offset.

9. The multi-cell secondary battery according to claim 3, wherein a bus bar connection part is further provided on the pin support plate, the pin bending plate is connected to one side edge of the bus bar connection part, the plurality of electrode legs are provided on the other side edge of the bus bar connection part, and the pin bending plate has a width smaller than that of the bus bar connection part.

10. The multi-cell secondary battery according to any one of claims 2 to 9, wherein the transfer expansion portion is provided at one side edge of each of the electrode tabs, and two adjacent electrode tabs are symmetrically provided, and each of the electrode legs simultaneously connects the two electrode tabs.