CN220914407U

CN220914407U - Soft package shell, battery and group battery

Info

Publication number: CN220914407U
Application number: CN202322536072.5U
Authority: CN
Inventors: 王振昆; 汪亚军; 曹勇; 闵长青; 吴昊天; 张永祥; 薛帅兵; 金彦章
Original assignee: Hefei Guoxuan High Tech Power Energy Co Ltd
Current assignee: Hefei Gotion High Tech Power Energy Co Ltd
Priority date: 2023-09-18
Filing date: 2023-09-18
Publication date: 2024-05-07
Anticipated expiration: 2033-09-18

Abstract

The utility model discloses a soft package shell, a battery and a battery pack, which belong to the technical field of soft package batteries, wherein the soft package shell comprises a cover plate and a shell body, the cover plate is arranged on one side of the shell body, the shell body is provided with a groove for accommodating a battery cell, and the groove and the cover plate are positioned on the same side of the shell body; the periphery of shell body is provided with banding portion, banding portion interconnect makes the shell body form seal structure. The soft package battery comprises the soft package shell and the battery core, wherein the battery core is arranged in the groove; the battery cell is provided with a tab, and the tab is connected with the electrode connecting sheet. The battery pack comprises a plurality of soft package batteries, and the soft package batteries are connected in series or in parallel to form a group. The soft package shell body has a cover plate structure, and the cover plate structure avoids the pre-fixing and bending procedures of the traditional soft package battery lugs in the Pack process; the soft cover body is lighter than the square battery body, and the energy density of the battery can be improved.

Description

Soft package shell, battery and group battery

Technical Field

The utility model relates to the technical field of soft package batteries, in particular to a soft package shell, a battery and a battery pack.

Background

Along with the rapid development of lithium ion batteries, the requirements of people on the lithium ion batteries are higher and higher, not only the demand of the lithium ion batteries is rapidly increased, but also the energy density and the like of the lithium ion batteries are also put forward. For the improvement of the energy density of the lithium ion battery, besides lighter materials, electrode materials with higher productivity and electrolyte can be used, the requirements can be met by optimizing the structure of the single battery and other methods.

Conventional electric cells in the current market are mainly classified into square-case batteries, soft-pack batteries and cylindrical batteries according to the shape. The soft package battery core is structurally packaged by adopting an aluminum plastic film, is lighter than steel shell lithium batteries with the same capacity by 40% and lighter than aluminum shell batteries by 20% in weight, has the advantage of high energy density, but the soft package battery core usually needs to process the lugs of the battery core twice in the actual Pack process, is respectively pre-fixed and complex bending processing, and then realizes high-voltage electric connection in the soft package module by adopting an ultrasonic welding or laser welding mode. Compared with square shell battery assembly, the soft package battery Pack process increases the processing procedure, causes unnecessary labor cost and reduces the working efficiency. Although the Pack process is efficient, the weight ratio of the square-shell battery cell to the square-shell battery cell is greatly reduced.

Through searching, chinese patent document with publication number CN109494321A discloses a square soft package battery, which comprises a cover plate, a soft connecting piece, a soft package battery core, a shell and a base, wherein the soft package battery core is positioned in the shell, the top of the soft package battery core is connected with the cover plate through the soft connecting piece and the cover plate is positioned at the top of the shell, and the base is positioned at the bottom of the shell. The soft-pack battery of the patent document has the soft-pack battery core placed in the shell so as to reduce the abrasion to the soft-pack battery in the use process, but the shell can increase the weight of the battery as well, and the problem of complex processing of the lug of the soft-pack battery cannot be avoided.

Disclosure of utility model

1. Technical problem to be solved by the utility model

Aiming at the problems that in the prior art, the processing of the lug of the soft-packaged battery is complex and the attached weight of the shell is large to cause the energy density of the battery, the utility model provides a soft-packaged shell, a cover plate and a groove for accommodating an electric core in the shell body are arranged on the same side, the shell body and the cover plate are integrated into a whole, the weight of the battery is lighter than that of the battery of the opposite shell, and the processing difficulty of the lug is smaller than that of the traditional soft-packaged battery.

The utility model also provides a soft package battery, which comprises the soft package shell.

The utility model also provides a battery pack which comprises the soft package battery.

2. Technical proposal

In order to achieve the above object, the present utility model provides a soft can body, comprising a cover plate and a can body, wherein the cover plate is disposed on one side of the can body, the can body is provided with a groove for accommodating a battery cell, and the groove and the cover plate are disposed on the same side of the can body; the periphery of shell body is provided with banding portion, banding portion interconnect makes the shell body form seal structure.

Further, the shell body is of a composite structure, and the shell body sequentially comprises an outer resistance layer, a first bonding layer, a barrier layer, a second bonding layer and a heat sealing layer from outside to inside.

Further, the cover plate and the shell body are bonded into a whole through the hot-press heat sealing layer.

Further, an electrode connecting sheet is arranged on the cover plate, and the hot-pressing area of the heat sealing layer avoids the position of the electrode connecting sheet.

Further, the electrode connecting sheet is of a butterfly welding structure.

Further, a pole is arranged on one side of the cover plate opposite to the electrode connecting sheet, and the pole is connected with the electrode connecting sheet; the shell body is provided with electrode holes corresponding to the positions of the polar posts, and the shapes and the sizes of the electrode holes are consistent with those of the polar posts.

Further, the apron sets up the intermediate position at the shell body, and the recess is provided with two, and two recesses are arranged about the apron symmetry.

Further, the joint of the edge sealing part is provided with a hemming structure.

The utility model also provides a soft package battery, which comprises the soft package shell and a battery core, wherein the battery core is arranged in the groove; the battery cell is provided with a tab, and the tab is connected with the electrode connecting sheet.

The utility model also provides a battery pack which comprises a plurality of soft package batteries, wherein the soft package batteries are connected in series or in parallel to form a group.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

(1) According to the soft package shell, the groove for accommodating the battery cell is formed in one side of the shell body, and the cover plate is arranged on the shell body and is on the same side as the groove, so that after the shell body is connected with each other through the edge sealing part to form a sealing structure, the cover plate is positioned in the shell body and forms an integrated structure with the shell body, the soft package shell is provided with the cover plate structure, and the cover plate structure avoids the pre-fixing and bending procedures of the traditional soft package battery lugs in the Pack process; the soft cover body is lighter than the square battery body, and the energy density of the battery can be improved.

(2) According to the soft package shell, the cover plate and the shell body are connected into a whole through the heat sealing layer, so that the connection firmness of the cover plate and the shell body can be enhanced. The hot-seal layer hot-press area avoids the position of the electrode connecting sheet, and the electrode connecting sheet is prevented from being damaged during hot-press heat-seal layer. The electrode connecting sheet of butterfly welding structure is favorable to electrode lug and the electrode connecting sheet of electric core to pair, and butterfly welding structure's welding speed is fast moreover, is favorable to electrode connecting sheet rapid prototyping, improves production efficiency.

(3) According to the soft package shell, the shell body adopts a composite structure, and the outer resistance layer has the advantages of impact resistance, puncture resistance, friction resistance and heat resistance and insulation; the barrier layer has good pinhole resistance and double-sided compounding property, and can be stably molded after processing; the heat seal layer has good heat seal adhesion, electrolyte resistance and insulation; the first bonding layer and the second bonding layer are used for compounding and forming the outer barrier layer, the barrier layer and the heat sealing layer. The edge sealing part of the shell body is connected with the edge sealing part through the edge curling structure, so that the edge sealing is more fastened and tighter, and the tightness of the soft package shell is enhanced.

(4) According to the soft-package battery, the battery core is arranged in the groove of the soft-package shell, the battery core lug is connected with the electrode connecting sheet of the cover plate, the pre-fixing and bending procedures of the lug in the traditional soft-package Pack process are replaced, the processing is simple, and the production efficiency is high. And the soft cover shell has lighter weight relative to the traditional square shell battery, thereby improving the energy density of the battery.

Drawings

In the drawings, the dimensions and proportions are not representative of the dimensions and proportions of an actual product. The figures are merely illustrative and certain unnecessary elements or features have been omitted for clarity.

FIG. 1 is a schematic view of a battery cell placed in a soft package housing according to an embodiment of the present utility model;

FIG. 2 is a schematic view showing the deployment state of the soft cover body and the structure of the cover plate in the embodiment of the present utility model;

fig. 3 is a schematic view of the structure of a battery pack according to an embodiment of the present utility model.

Reference numerals in the schematic drawings illustrate:

1. A cover plate; 2. a housing body; 201. a groove; 202. edge sealing parts; 3. a battery cell; 4. an electrode connecting sheet; 5. a current collecting row; 6. a pole.

Detailed Description

For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples. What has been described herein is merely a preferred embodiment according to the present utility model, and other ways of implementing the utility model will occur to those skilled in the art on the basis of the preferred embodiment, and are within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," "horizontal," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Examples

Referring to fig. 1-3, the present embodiment provides a soft-pack battery, which includes a cover plate 1, a case body 2 and a battery cell 3, wherein the case body 2 covers the battery cell 3, and the case body 2 is a soft-pack case. The cover plate 1 is arranged on one side of the shell body 2, the shell body 2 is provided with a groove 201 for accommodating the battery cell 3, and the groove 201 and the cover plate 1 are positioned on the same side of the shell body 2; the periphery of the shell body 2 is provided with edge sealing parts 202, and the edge sealing parts 202 are mutually connected to enable the shell body 2 to form a sealing structure. After the shell body 2 is mutually connected to form a sealing structure through the edge sealing portion 202, the cover plate 1 is located inside the shell body 2 at this time and forms an integrated structure with the shell body 2, and compared with the traditional square shell battery shell, the weight of the shell body 2 is lighter, and the energy density of the battery can be improved. An electrode connecting sheet 4 is arranged on the cover plate 1, and a lug is arranged on one side of the battery cell 3, which is close to the position of the electrode connecting sheet 4, and is connected with the electrode connecting sheet 4. Meanwhile, the structure of the cover plate 1 avoids the pre-fixing and bending procedures of the lugs of the soft-package battery in the Pack process, has the advantages of less procedures and high efficiency of the square-shell battery Pack, reduces the cost and improves the manufacturing efficiency.

In the present embodiment, the cover plate 1 and the case body 2 are bonded together by the heat seal layer, so that the connection between the cover plate 1 and the case body 2 can be enhanced. The hot-pressing area of the heat-sealing layer avoids the position of the electrode connecting sheet 4, and unnecessary damage to the electrode connecting sheet 4 during hot-pressing of the heat-sealing layer is prevented. The structure of the cover plate 1 can refer to the end cover structure of a conventional lithium battery, an integrated electrode connecting sheet 4 is arranged on the basis of the conventional end cover structure, the electrode connecting sheet 4 adopts a butterfly welding structure, the electrode connecting sheet 4 of the butterfly welding structure is favorable for paired connection of the electrode lugs of the battery core 3 and the electrode connecting sheet 4, and the butterfly welding structure is high in welding speed, so that the electrode connecting sheet 4 can be molded rapidly, and the production efficiency is improved. The electrode connection sheet 4 includes a positive electrode connection sheet and a negative electrode connection sheet.

Specifically, in this embodiment, the shell body 2 is a composite structure, mainly made of an aluminum-plastic composite film material, and the shell body 2 sequentially includes an outer resistive layer, a first adhesive layer, a barrier layer, a second adhesive layer and a heat sealing layer from outside to inside. The material of the outer resistance layer is mainly nylon, and the nylon has the advantages of impact resistance, puncture resistance, friction resistance and heat resistance and insulation. The material of the barrier layer is mainly aluminum foil, and the aluminum foil has good pinhole resistance and double-sided compounding property. The material of the heat sealing layer is mainly CPP, and the CPP has good heat sealing adhesion, electrolyte resistance and insulativity. The first bonding layer and the second bonding layer are mainly adhesive, the adhesive needs to have electrolyte resistance, high temperature resistance, aging resistance and good bonding performance, and the adhesive bonds the outer barrier layer, the barrier layer and the heat sealing layer to be compositely formed.

In this embodiment, as shown in fig. 1 and fig. 2, the electric core 3 is two stacked winding cores or stacked cores with the same size, the thickness of the stacked two electric cores 3 is consistent with the width dimension of the cover plate 1, the width dimension of the electric core 3 is smaller than the length of the cover plate 1, the electric core is convenient to close, and the electrode lugs are led out from the upper end of the electric core 3. The shell body 2 is an aluminum-plastic composite film and is unfolded to be of a planar structure, the cover plate 1 is fixed in the middle of the aluminum-plastic composite film, grooves 201 are punched on two sides of the aluminum-plastic composite film according to the size of the battery cell 3, and the grooves 201 on two sides are symmetrically arranged with respect to the cover plate 1. The length and width of the groove 201 are both greater than the corresponding length and width of the battery cell 3, specifically, the length and width of the battery cell 3 are increased by 2 mm-3 mm. Wherein, the one side of apron 1 relative electrode connection piece 4 is provided with utmost point post 6, and utmost point post 6 is the rivet structure that runs through apron 1, and utmost point post 6 is connected with electrode connection piece 4, and the connected mode is mainly welding. The shell body 2 is provided with electrode holes corresponding to the positions of the polar posts 6, the shapes and the sizes of the electrode holes are consistent with those of the polar posts 6, and the electrode holes are rectangular holes.

When the soft-package battery is assembled, the battery cells 3 are symmetrically placed in the grooves 201 on two sides of the aluminum-plastic composite film respectively by taking the cover plate 1 as an axis, and the lug direction of the battery cells 3 faces the direction of the cover plate 1. And (3) the tabs of the battery cells 3 on two sides are in butterfly welding connection with the electrode connecting sheets 4, core combination is carried out, then the aluminum-plastic composite film on the periphery of the battery cells 3 is subjected to heat sealing, redundant aluminum-plastic composite films on the periphery are cut off, the heat sealing position is subjected to hemming treatment, and finally liquid injection and sealing are carried out through a liquid injection port.

In another aspect of the present embodiment, a battery pack is provided, which includes a plurality of soft-pack batteries, wherein the plurality of soft-pack batteries are arranged in parallel in a series or parallel manner, the cover plates 1 are aligned, and the cover plates 1 are directly welded together through the current collector 5, similar to the square-case batteries, i.e. assembled into the battery pack.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims

1. The soft shell comprises a cover plate (1) and a shell body (2), and is characterized in that the cover plate (1) is arranged on one side of the shell body (2), the shell body (2) is provided with a groove (201) for accommodating a battery cell (3), and the groove (201) and the cover plate (1) are positioned on the same side of the shell body (2); the periphery of the shell body (2) is provided with edge sealing parts (202), and the edge sealing parts (202) are mutually connected to enable the shell body (2) to form a sealing structure.

2. The soft package shell according to claim 1, wherein the shell body (2) is a composite structure, and the shell body (2) sequentially comprises an outer resistance layer, a first bonding layer, a barrier layer, a second bonding layer and a heat sealing layer from outside to inside.

3. A flexible package according to claim 2, wherein the cover plate (1) and the housing body (2) are bonded together by means of a heat-seal layer.

4. A flexible package according to claim 3, wherein the cover plate (1) is provided with electrode connection pieces (4), and the hot-pressing area of the heat-sealing layer avoids the positions of the electrode connection pieces (4).

5. A flexible package according to claim 4, wherein the electrode connection pads (4) are butterfly welded.

6. The soft package shell according to claim 4, wherein a pole (6) is arranged on one side of the cover plate (1) opposite to the electrode connecting sheet (4), and the pole (6) is connected with the electrode connecting sheet (4); the shell body (2) is provided with electrode holes corresponding to the positions of the polar posts (6), and the shapes and the sizes of the electrode holes are consistent with those of the polar posts (6).

7. A soft package housing according to claim 1, characterized in that the cover plate (1) is arranged in the middle of the housing body (2), two grooves (201) are provided, and the two grooves (201) are symmetrically arranged with respect to the cover plate (1).

8. A flexible package according to claim 1, wherein the edge seal (202) is provided with a bead structure at the junction.

9. A battery comprising a soft pack case according to any one of claims 1-8 and a battery cell (3), said battery cell (3) being arranged in a recess (201); the battery core (3) is provided with a tab, and the tab is connected with the electrode connecting sheet (4).

10. A battery comprising a plurality of cells according to claim 9, wherein the plurality of cells are connected in series or in parallel.