CN220324662U

CN220324662U - Core package assembly and multi-pole group battery core

Info

Publication number: CN220324662U
Application number: CN202321973428.5U
Authority: CN
Inventors: 林亮文; 李敏
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2023-07-26
Filing date: 2023-07-26
Publication date: 2024-01-09
Anticipated expiration: 2033-07-26

Abstract

The utility model provides a core-package assembly and a multi-pole group battery core, which comprises a winding core package and a pole lug group, wherein the pole lug group is arranged on the winding core package; the number of the winding core packages is at least two, the winding core packages are relatively fixed, the tab groups are all located on the same side of the winding core packages, and projections of the tab groups on the maximum cross section of the winding core packages are not overlapped. This core package subassembly and multipolar group electric core adopts different utmost point ear group dislocation welded mode, has reduced because of the utmost point ear layer number is more, and partial utmost point ear appears the risk of overselding or rosin joint easily, and still has better electric connection performance, simultaneously, gets rid of switching piece and can promote electric core's energy density, space utilization and reduce cost, for utilizing switching piece welding, utmost point ear group and utmost point post direct welded's mode, reduces the structure internal resistance, has promoted electric core performance.

Description

Core package assembly and multi-pole group battery core

Technical Field

The utility model relates to the technical field of power batteries, in particular to a core-in-package assembly and a multi-pole group battery cell.

Background

The lithium ion battery core has wide application in energy storage, transportation means, electronic products and the like by virtue of the characteristics of green color, safety, high energy density and the like. With the expansion of the application range, higher requirements are also put on the performance of lithium ions, and the requirements for higher energy density and more excellent performance are increasingly increasing. Higher energy densities are not separated by high capacity and low mass, and more excellent performance requires lower internal resistance.

At present, high-capacity and large-size battery cells are assembled in a combination mode of a multi-core package, and after the battery cells are combined into the core package, battery cell lugs are firstly welded by ultrasonic, and then are connected with a cover plate by using a switching piece. For example, in an electrode tab and battery tab switching structure with publication number CN115377620a, the energy density of the battery core is improved by optimizing the tab structure, however, no matter how the tab structure is optimized, the weight, thickness and cost of the tab exist, so that the energy density, space utilization improvement and cost reduction of the battery core are limited, meanwhile, the internal resistance of a structural member can be increased by introducing welding of the tab, and the improvement of performance can be limited.

Disclosure of Invention

In view of this, the utility model provides a core pack assembly and a multi-pole group battery cell, which can directly weld the battery cell to a pole column without stacking the battery cell by arranging the pole groups on the core pack in a staggered manner, so as to omit a switching piece and improve the energy density and the space utilization rate of the battery cell.

The technical scheme of the utility model is realized as follows:

in one aspect, the present utility model provides a core pack assembly comprising a winding core pack and a tab set, wherein,

the tab group is arranged on the winding core bag;

the number of the winding core packages is at least two, the winding core packages are relatively fixed, the tab groups are all located on the same side of the winding core packages, and projections of the tab groups on the maximum cross section of the winding core packages are not overlapped.

On the basis of the above technical solution, it is preferable that the tab groups of different polarities are not adjacent to each other.

On the basis of the technical scheme, preferably, the winding core bag is provided with two tab groups which are mirror images of each other.

In another aspect, the present utility model provides a multipole-group cell comprising two poles and the core pack assembly described above, wherein,

and the two pole posts are welded with the positive pole lug group and the negative pole lug group respectively.

On the basis of the above technical scheme, preferably, the pole comprises a pole head and a connecting part, the pole head and the connecting part are mutually fixed, and the pole lug group and the connecting part are fixed on one side far away from the pole head.

On the basis of the technical scheme, the pole assembly comprises a cover plate, and the two poles are fixed on the cover plate.

On the basis of the above technical solution, preferably, the number of the core pack assemblies is at least two, and each winding core pack is relatively fixed.

Further preferably, the tab groups are arranged in an array on the pole.

Further preferably, the device further comprises a housing for accommodating the core pack assembly, and the cover plate is fixed on the housing.

On the basis of the above technical scheme, preferably, each tab group is bent towards the corresponding tab.

Compared with the prior art, the core-in-package assembly and the multi-pole group battery core have the following beneficial effects:

(1) The method has the advantages that the dislocation welding mode of different lug groups is adopted, the risk that excessive welding or insufficient welding occurs to part of lugs due to the fact that the number of lug layers is large is reduced, good electrical connection performance is still achieved, meanwhile, the energy density, the space utilization rate and the cost of the battery core can be improved by removing the switching piece, and compared with the mode of welding by utilizing the switching piece, the direct welding mode of the lug groups and the lugs is adopted, internal resistance of a structure is reduced, and the performance of the battery core is improved;

(2) The winding core package is provided with two tab groups which are mirror images, and the winding core package can be installed to form a core package component without considering the front and back problems, so that the consistency and stability of products are improved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIGS. 1-2 are schematic views of a single wound core pack of the core pack assembly of the present utility model;

FIG. 3 is a schematic view of two winding core pack combinations of the core pack assembly of the present utility model;

FIG. 4 is a schematic diagram of a process of welding a winding core pack and a post of a multi-pole set cell of the present utility model;

fig. 5 is a schematic structural diagram of a multipole group cell of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

As shown in fig. 1 to 5, the core pack assembly of the present utility model includes a winding core pack 1 and tab set 2.

The winding core package 1 is formed by stacking a spacer, a positive plate and a negative plate in sequence, wherein a first layer and a last layer which are stacked are spacers, after stacking, the winding core package 1 is wound along the outer part similar to a square plate, two side surfaces in the length direction of the winding core package 1 are formed into arc surfaces similar to cylindrical parts, the positive and negative poles 3 of the square shell battery core are required to be connected with positive and negative groups on the winding core package 1 as the internal structure of the square shell battery core, and a plurality of shaping adhesive tapes are adhered to the outer part after the wound spacer, the positive plate and the negative plate form the winding core package 1 and are respectively arranged on two sides of the winding core package 1 in the width direction, so that the winding core package 1 is prevented from being opened loosely.

The tab group 2 is arranged on the winding core package 1, the tab group 2 is a homopolar tab laminated structure on the winding core package 1, at least two tab groups 2 are arranged on the winding core package 1 and are respectively the positive electrode and the negative electrode of the core package, in order to facilitate processing and connection, the tabs on the pole pieces are cut into trapezoids usually when the pole pieces are cut, and all the tabs in the tab group 2 are kneaded together to form the tab group 2 after the winding core package 1 is wound and formed.

For the high-capacity and large-size battery core, the number of the winding core packages 1 inside the battery core package is at least two and is relatively fixed, in the embodiment, each tab group 2 is located on the same side of the winding core package 1, projections on the maximum cross section of the winding core package 1 are not overlapped, namely, the tab groups 2 cannot overlap each other when being welded to the pole 3, and different tab groups 2 are in a staggered welding mode, so that the risk of overselding or insufficient welding of part of the tabs is reduced due to the fact that the number of tab layers is large, and the battery core package still has good electrical connection performance.

In this embodiment, the tab groups 2 with different polarities are not adjacent to each other, that is, the tab groups 2 with the same polarity are adjacent to each other, and since all the tab groups 2 are on the same side of the winding core package 1, the tab groups 2 with different polarities are divided into two groups and are respectively disposed at two ends of each winding core package 1, so as to facilitate connection of the tab posts 3 with the same polarity.

As a preferred embodiment, the winding core pack 1 is provided with two tab groups 2, which are mirror images of each other, so that the winding core pack 1 is installed without considering the front and back problems when forming a core pack assembly, which is beneficial to improving the consistency and stability of the product.

As shown in fig. 4 to 5, the multipolar battery cell of the present utility model includes two poles 3 and the core pack assembly, wherein the multipolar battery cell includes a plurality of tab groups 2, and two poles 3 are usually disposed on a single battery cell, so this embodiment is described by taking two poles 3 as an example, but the present embodiment is applicable to the case of disposing four poles 3 or more.

The two pole posts 3 are respectively welded with the positive pole and the negative pole tab group 2, the pole posts 3 are connecting parts of the battery cell for connecting the whole battery pack, the battery pack is required to be connected in series or in parallel through a busbar when the battery pack is formed, the two pole posts 3 are respectively connected with the positive pole tab group 2 and the negative pole tab group 2 on the winding core pack 1, and the specific welding mode is ultrasonic welding.

Specifically, the pole 3 includes a pole head 31 and a connecting portion 32, the pole head 31 and the connecting portion 32 are fixed mutually, the pole lug group 2 and the connecting portion 32 are fixed away from one side of the pole head 31, the pole head 31 is a portion for connecting a busbar, the connecting portion 32 is a portion electrically connected with the winding core package 1, during welding, one of the pole lugs on the outermost side of the pole lug group 2 is attached to the connecting portion 32, and welding is performed from the pole lug on the other side, so that welding marks are formed between the pole lug group 2 and the pole 3, and the pole lug group 2 and the pole 3 are stably fixed.

For convenience of understanding, in this embodiment, two core pack assemblies are set, as shown in fig. 4, when welding, one of the tabs on the outermost side of the tab group 2 needs to be attached to the connection portion 32, so that the two core pack assemblies are symmetrically tiled to two sides of the two poles 3, and since the tab groups 2 on the same core pack assembly are staggered, the tab group 2 is pressed onto the poles 3 to be welded, the tab groups 2 cannot be repeatedly stacked, and after the welding is completed, the two core pack assemblies are mutually attached and fixed, so that each tab group 2 is bent towards the corresponding pole 3, and it is noted that for the winding core pack 1 further from the pole 3, the length of the tab group 2 on the winding core pack 1 is longer, so as to avoid the tab breakage in the bending process, or the core pack assemblies cannot be attached and fixed.

In addition, this embodiment further includes a cover plate 4, two pole 3 are all fixed on the cover plate 4, the pole head 31 on the pole 3 runs through the cover plate 4 and extends to the opposite side of the cover plate 4, and the connecting portion 32 is then attached with the cover plate 4 on one side, and the opposite side is the part of connecting the tab group 2, because the cover plate 4 adopts aluminum alloy material generally, in order to avoid the pole 3 to directly contact with the cover plate 4 and cause the short circuit between two pole 3, need set up the insulating layer between pole 3 and cover plate 4, the insulating layer can select rubber backing plate etc..

In the present embodiment, the number of the core pack assemblies is at least two, and each winding core pack 1 is relatively fixed, and the above-mentioned two core pack assemblies are not taken as examples, and only two core pack assemblies can be used.

In addition, two or more core package components can contain at least eight tab groups 2, the tab groups 2 are arranged on the pole column 3 in an array manner, namely, at least four tab groups 2 are respectively required to be connected to the positive pole and the negative pole column 3, the tab groups 2 are arranged on the pole column 3 in an array manner, the consistency of products can be improved, the automatic welding production is facilitated, and the quality of the products is improved.

Finally, still include casing 5, casing 5 is used for holding core package subassembly, apron 4 is fixed on casing 5, and casing 5 is the aluminum alloy shell, and its one side opening, apron 4 closing cap are in the opening side of casing 5, have set up explosion-proof valve on apron 4 simultaneously, and two utmost point posts 3 are mirror images each other.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A core pack assembly comprises a winding core pack (1) and a tab group (2), wherein,

the tab group (2) is arranged on the winding core bag (1);

the method is characterized in that: the number of the winding core bags (1) is at least two, the winding core bags are relatively fixed, the tab groups (2) are all located on the same side of the winding core bag (1), and projections of the tab groups on the maximum cross section of the winding core bag (1) are not overlapped.

2. The core pack assembly of claim 1, wherein: the tab groups (2) of different polarities are not adjacent to each other.

3. The core pack assembly of claim 1, wherein: the winding core bag (1) is provided with two tab groups (2) which are mirror images.

4. A multipole group cell characterized by: comprising two poles (3) and a core pack assembly according to any of claims 1-3, wherein,

the two pole posts (3) are welded with the positive pole lug group (2) respectively.

5. The multipole group cell of claim 4, wherein: the pole (3) comprises a pole head (31) and a connecting portion (32), the pole head (31) and the connecting portion (32) are mutually fixed, and the pole ear group (2) and the connecting portion (32) are fixed on one side far away from the pole head (31).

6. The multipole group cell of claim 4, wherein: the novel solar cell further comprises a cover plate (4), and the two pole posts (3) are fixed on the cover plate (4).

7. The multipole group cell of claim 4, wherein: the number of the core package components is at least two, and each winding core package (1) is relatively fixed.

8. The multipole group cell of claim 7, wherein: the electrode lug groups (2) are arranged on the electrode posts (3) in an array mode.

9. The multipole group cell of claim 6, wherein: the novel core bag comprises a shell, and is characterized by further comprising a shell (5), wherein the shell (5) is used for accommodating the core bag component, and the cover plate (4) is fixed on the shell (5).

10. The multipole group cell of claim 4, wherein: each tab group (2) is bent towards the corresponding pole (3).