CN119133787B

CN119133787B - Battery adapter, battery tab adapter structure and lithium battery

Info

Publication number: CN119133787B
Application number: CN202411255028.XA
Authority: CN
Inventors: 李季
Original assignee: Xiaogan Chuneng New Energy Innovation Technology Co ltd
Current assignee: Xiaogan Chuneng New Energy Innovation Technology Co ltd
Priority date: 2024-09-09
Filing date: 2024-09-09
Publication date: 2025-09-16
Anticipated expiration: 2044-09-09
Also published as: CN119133787A

Abstract

The present invention proposes a battery adapter, a battery tab adapter structure and a lithium battery, which relate to the field of battery technology. The battery adapter includes a first sheet for electrically connecting to a cover plate; two second sheets, respectively located on both sides of the same surface of the first sheet in the width direction, the second sheets are vertically fixedly connected to the first sheet, and the two second sheets are provided with tab welding portions on the opposite sides thereof, the tab welding portions being used for welding to the tabs on the core package. Compared with the traditional tab butterfly welding process, since the tabs are welded in parallel to the tab welding portions on the second sheets, there is no need to flip the core package during the process of inserting the core package into the shell, and thus there is no need to bend the tabs, which effectively avoids the problem of tab stress concentration and fracture during the bending process. The parallel welding design reduces the length of the tabs, avoids the tabs occupying the internal space of the battery when bending, minimizes the space waste caused by the tab folding, and improves the energy density of the battery.

Description

Battery adapter, battery tab adapter structure and lithium battery

Technical Field

The invention relates to the technical field of batteries, in particular to a battery adapter, a battery tab adapter structure and a lithium battery.

Background

Blade batteries are becoming an important battery type in the power automobile and electric energy storage fields, and are becoming widely used and accepted in the market due to their high energy density, good safety performance and long life. The core package of the current blade battery is manufactured by adopting a lamination process, namely, a plurality of battery pole pieces are stacked one by one to form the battery core package. In this process, each pole piece is provided with a tab, and the number and thickness of the tabs have an important influence on the overall performance of the battery.

In the manufacturing process of the prismatic battery, a butterfly welding process is generally used in the prior art for welding the tab and the cap plate. The main process of the technology is that two battery core packages are placed in parallel, the lug between the two battery core packages is welded through an adapter, and after the welding is completed, the adapter is welded with a battery cover plate. After welding, the core bag is folded from a horizontal state and is installed in the battery shell. The welding mode is relatively simple to operate and is suitable for welding battery core packages with certain sizes, but obvious defects are exposed in the application of blade batteries.

Because the core package of the blade battery is longer, the number and the thickness of the tabs are obviously increased, so that in the butterfly welding process, the core package is easy to cause problems in the process of folding and inserting the core package into the shell after the core package is welded. Firstly, when the tab is folded, the tab is easy to generate stress concentration, and the risk of bending and breaking the tab is increased. Secondly, when the longer core package is turned over, the thickness of the tab can cause the folded region to occupy a larger space in the shell, affecting the energy density of the battery. In addition, the core pack has a large length and a large size, and is distorted or deformed by the folding operation, which results in a damaged structure.

Disclosure of Invention

In view of this, the invention provides a battery adapter, a battery tab adapter structure and a lithium battery, which are used for solving the problem that the tab is damaged due to tab thickness and stress concentration in the tab folding process and the problem that the energy density of the battery is reduced due to tab folding when a tab butterfly welding process is used for a blade.

The technical scheme of the invention is realized as follows:

In a first aspect, the present invention provides a battery adapter comprising:

the first sheet body is used for being electrically connected with the cover plate;

Two second lamellar bodies are located the width direction both sides of first lamellar body coplanar respectively, and second lamellar body and first lamellar body perpendicular fixed connection, and two second lamellar body one side in opposite directions all are provided with utmost point ear welding portion, utmost point ear welding portion is used for with the utmost point ear welding on the core package.

On the basis of the technical scheme, the novel solar panel further comprises two third sheets, wherein the two third sheets are respectively positioned on the other two sides of the first sheet, the third sheets are vertically connected with the first sheet and the second sheet, and the first sheet, the second sheet and the third sheet jointly enclose to form an installation cavity.

On the basis of the above technical scheme, preferably, the second sheet body is provided with a through hole, and the through hole is used for allowing the tab on the core pack to pass through from the outer side of the second sheet body and enter the mounting cavity.

As some embodiments, the first sheet body is provided with a pole welding part for welding with a pole on the cover plate, and the penetrating hole is located at one end of the second sheet body, which is close to the first sheet body.

As other embodiments, the top end of the third sheet body horizontally extends to the outside of the mounting cavity along the length direction of the first sheet body to form a fourth sheet body, and a pole welding part is arranged on the fourth sheet body and used for welding with a pole on the cover plate, and the penetrating hole is positioned at one end of the second sheet body far away from the first sheet body.

In a second aspect, the invention also discloses a battery tab switching structure, which comprises a cover plate, two core bags and the battery switching piece in the first aspect, wherein tabs with the same polarity on the two core bags are respectively welded with tab welding parts on the battery switching piece, and the first sheet body is electrically connected with the cover plate.

On the basis of the technical scheme, preferably, the cover plate comprises a light aluminum plate and a lower plastic part fixedly arranged on the bottom surface of the light aluminum plate, a pole is arranged on the cover plate, the battery adapter is fixedly arranged at the central axis of the bottom surface of the lower plastic part, and a pole welding part on the first sheet body or the fourth sheet body is welded with the pole.

On the basis of the technical scheme, preferably, the distance between the outermost sides of the two second sheet bodies is half of the total thickness of the two core bags.

On the basis of the technical scheme, preferably, the two ends of the lower plastic part in the length direction are respectively provided with a limiting part, and the height of the battery adapter is smaller than or equal to that of the limiting parts.

In a third aspect, the invention also discloses a lithium battery, which comprises a shell and the battery tab switching structure in the second aspect, wherein the core pack is arranged in the shell, and the cover plate is fixedly connected with the opening end of the shell.

Compared with the prior art, the invention has the following beneficial effects:

(1) Compared with the traditional tab butterfly welding process, because the tab welding part on the tab and the second sheet body is welded in parallel, after the welding of the tab on the battery adapter and the blade battery core pack is completed, the two core packs are mutually parallel and close, the core pack is not required to be turned over in the process of being put into the shell, so that the tab is not required to be bent, the tab stress concentration and fracture problem in the bending process are effectively avoided, the tab length is reduced, the occupation of the tab to the battery inner space during bending is avoided, the space waste caused by tab folding is reduced to the greatest extent, and the energy density of the battery is improved.

(2) The lug on the core pack and the lug welding part on the second sheet body are welded in parallel, the process operation is simple, the core pack is directly inserted into the shell in the shell entering process, the core pack does not need to be overturned, the distortion and deformation damage of the core pack with larger length dimension in the overturning process can be avoided, and the safety of the core pack in the manufacturing process is improved.

(3) Through the through holes formed in the second sheet body, redundant lugs enter the mounting cavity safely through the through holes, and the contact between the lugs and the shell of the battery is avoided, so that the safety risk of the battery caused by short circuit is reduced.

(4) Through making the interval between two second lamellar body outsides be two core package total thickness half, the utmost point ear group on the core package can keep parallel welding with the second lamellar body outside from this, and welding operation is convenient, can not cause buckling to the utmost point ear in welding process. Meanwhile, after the welding of the tab and the second sheet body is completed, the tab and the second sheet body are connected in parallel in the height direction of the battery after the whole core is packaged in the shell, the situation mode of relative twisting, bending and connecting stress cannot occur, and the safety and reliability of connection of the tab and the battery adapter are improved.

(5) The top end of the third sheet body horizontally extends to the outer side of the mounting cavity along the length direction of the first sheet body to form a fourth sheet body, a pole welding part is arranged on the fourth sheet body, and a through hole is formed in one end, far away from the first sheet body, of the second sheet body. The structure is arranged, so that the battery adapter can be suitable for double-side tab discharging, the explosion-proof valve or the liquid injection hole is formed in the center of the cover plate, and bipolar posts are symmetrically arranged on the cover plate, so that the battery adapter can provide liquid injection or exhaust channels for the cover plate, and welding with the bipolar posts can be realized, and the adaptability is strong.

Drawings

In order to more clearly illustrate the embodiments of the invention 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 invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic front view of a first embodiment of a battery adapter according to the present disclosure;

Fig. 2 is a schematic view showing a rear structure of a first embodiment of a battery adapter according to the present disclosure;

FIG. 3 is a schematic view of a first assembly structure of a battery adapter and a cover plate according to the present disclosure;

Fig. 4 is a schematic perspective view of a first embodiment of a battery tab adapter structure according to the present disclosure;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

fig. 6 is a schematic perspective view of a first embodiment of a lithium battery according to the present disclosure;

Fig. 7 is a top view of a first embodiment of a lithium battery disclosed in the present invention;

FIG. 8 is a plan sectional view taken at B-B of FIG. 7;

FIG. 9 is a plan sectional view taken at C-C of FIG. 7;

FIG. 10 is a schematic front view of a second embodiment of a battery adapter according to the present disclosure;

FIG. 11 is a schematic view of a rear structure of a second embodiment of a battery adapter according to the present disclosure;

FIG. 12 is a schematic view of a second assembly structure of the battery adapter and cover plate of the present disclosure;

fig. 13 is a schematic perspective view of a second embodiment of a battery tab adapter structure according to the present disclosure;

FIG. 14 is an enlarged view of a portion of FIG. 13 at D;

Fig. 15 is a schematic perspective view of a second embodiment of a lithium battery according to the present disclosure;

fig. 16 is a top view of a first embodiment of the disclosed lithium battery;

FIG. 17 is a plan sectional view taken at E-E of FIG. 16;

FIG. 18 is a plan sectional view taken at F-F in FIG. 16;

reference numerals:

1. the battery adapter comprises a battery adapter, 11, a first sheet body, 12, a second sheet body, 121, a tab welding part, 13, a third sheet body, S, an installation cavity, 122, a through hole, H, a tab welding part, 14, a fourth sheet body, 2, a cover plate, 3, a core package, 31, a tab, 21, an optical aluminum plate, 22, a lower plastic part, 23, a tab, 221, a limiting part, 4, a shell, G, an explosion-proof valve, Z and a liquid injection hole;

Detailed Description

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

As shown in fig. 1, in combination with fig. 2, 4, 5, 8, 10 and 11, an embodiment of the present invention discloses a battery adapter for realizing connection between a tab 31 and a cover plate 2, and specifically, the battery adapter 1 disclosed in the embodiment includes a first sheet 11 and two second sheets 12.

The first sheet 11 is electrically connected to the cover 2, specifically, to the post 23 on the cover 2.

The second sheet 12 is provided with two pieces, which are respectively located at both sides of the width direction of the first sheet 11, and is vertically fixedly connected to the first sheet 11. Thus, the second sheet 12 is a vertically arranged sheet in structure, perpendicular to the first sheet 11, thereby forming a three-dimensional structure. The two second sheet bodies 12 are provided with tab welding parts 121 on opposite sides, and the tab welding parts 121 are used for welding with the tabs 31 on the core pack 3. By the aid of the structure, the core package 3 and the second sheet body 12 are arranged in parallel, and the lugs 31 on the core package 3 can be directly welded with the adapter in parallel under the condition of not bending.

Compared with the traditional tab 31 butterfly welding process, because the tab 31 is welded with the tab welding part 121 on the second sheet body 12 in parallel, after the welding of the tab 31 on the battery adapter 1 and the blade battery core pack 3 is completed, the two core packs 3 are mutually parallel and close, and the core pack 3 is not required to be turned over in the shell entering process, so that the tab 31 is not required to be bent, the problems of stress concentration and breakage of the tab 31 in the bending process are effectively avoided, the length of the tab 31 is reduced, the occupation of the tab 31 to the internal space of the battery in the bending process is avoided, the space waste caused by the folding of the tab 31 is furthest reduced, and the energy density of the battery is improved.

The manufacturing process without bending simplifies the production steps and reduces the complex operation and potential damage risk caused by bending. The method not only reduces the process difficulty, but also improves the production efficiency and reduces the failure rate in the production process.

In addition, it is worth noting that, because the battery adapter 1 with the three-dimensional structure disclosed in this embodiment is adopted, two core packages 3 of the blade battery do not lie between the battery adapters 1 in a butterfly welding mode of the tabs 31, but the tabs 31 on the core packages 3 and the tab welding parts 121 on the second sheet body 12 are directly welded in parallel, the process operation is simple, the core packages 3 are directly inserted into the shell 4 in the shell entering process, the core packages 3 do not need to be overturned, the distortion and deformation damage caused by the core packages 3 with larger length and size in the overturning process can be avoided, and the safety of the core packages 3 in the manufacturing process is improved.

As some preferred embodiments, the battery adapter 1 of the present embodiment further includes two third sheets 13 respectively located at two other sides of the first sheet 11, the third sheets 13 are vertically connected with the first sheet 11 and the second sheet 12, and the first sheet 11, the second sheet 12 and the third sheet 13 jointly enclose a mounting cavity S.

By adopting the technical scheme, the battery adapter 1 forms a more stable three-dimensional structure by adding the third sheet body 13, so that the mechanical stability of the whole battery adapter 1 is enhanced. Meanwhile, the two ends of the second sheet body 12 are supported by the third sheet body 13 in a reinforcing way, so that the structural strength of the second sheet body 12 in the whole battery adapter 1 is higher, and the stability and reliability of the tab 31 welded with the tab welding part 121 on the second sheet body 12 are improved.

The mounting cavity S is formed to facilitate accommodating the tab 31 of an excessive length after the tab 31 is welded.

Because the core pack 3 of the blade battery adopts a laminated structure, each pole piece end is provided with a pole lug 31, the pole lugs 31 need to be pre-welded before being welded with the battery adapter 1, so that the pole lugs 31 form a pole lug 31 group, the pole lugs 31 have a certain length to ensure that the pole lug 31 group with a certain length can be met after the pre-welding, and the pole lug 31 group has a certain length, the length of the second sheet body 12 is limited, and the pole lug 31 group cannot be completely welded on the welding part of the second sheet body 12, so that the extra length exists in the pole lugs 31, and the pole lugs 31 with the extra length possibly touch the shell 4, so that the circuit is short-circuited. If the manual trimming mode is adopted, the process is complicated.

For this reason, in the present embodiment, the second sheet 12 is provided with a through hole 122, and the through hole 122 is used for the tab 31 on the core pack 3 to pass through from the outer side of the second sheet 12 and enter into the mounting cavity S. Therefore, the extra length of the tab 31 is not required to be processed through manual trimming, and workers only need to guide the tab 31 into the mounting cavity S through the through hole 122 in the production process, so that the manufacturing process is simplified, and the labor cost and the operation complexity are reduced. The redundant tab 31 safely enters the mounting cavity S through the through hole 122, so that the contact between the tab 31 and the battery shell 4 is avoided, and the battery safety risk caused by short circuit is reduced.

The core pack 3 of the blade battery has a form of a single-side tab 31 and a form of two-side tabs 31, and for the two forms, the embodiment discloses the structure of two battery adapters 1 so as to meet the use requirements of different forms.

Referring to fig. 3-9, when the core pack 3 of the blade battery is a single-side tab 31, the posts 23 on the cover plate 2 are respectively located at two ends of the length direction of the cover plate 2, and the explosion-proof valve G and the liquid injection hole Z on the cover plate 2 are located between the two posts 23, so as to connect the battery adapter 1 with the tab 31 and the cover plate 2, in this embodiment, a post welding portion H is provided on the first sheet 11 for welding with the posts 23 on the cover plate 2. Specifically, a pole welding portion H may be formed on a surface of the first sheet 11, which is far away from the mounting cavity S, and the pole welding portion H may be a recess, so that the pole 23 is embedded in the recess, at this time, the first sheet 11 is attached to the bottom surface of the cover plate 2, and welding of the pole welding portion H and the pole 23 may be achieved by laser penetration welding through the mounting cavity S.

In order to facilitate the welding of the tab 31 to the second sheet 12, the extra tab 31 can enter the mounting cavity S to be hidden, in this embodiment, the through hole 122 is disposed at one end of the second sheet 12 close to the first sheet 11, so that after the welding of the first sheet 11 and the post 23 of the cover plate 2 is achieved, the core 3 and the second sheet 12 are placed in parallel, so that the part of the tab 31 close to the core 3 is welded to the tab welding portion 121 along the end of the second sheet 12 far from the first sheet 11, and after the welding is completed, the extra tab 31 is inserted into the mounting cavity S from the through hole 122 to be hidden.

When the core pack 3 of the blade battery is the double-sided tab 31, as an embodiment, when the pole 23 is located at the center of the cap plate 2, the battery adapter 1 is constructed in the same manner as disclosed in the above embodiment. When the explosion-proof valve G or the liquid filling hole Z is located at the center of one of the cover plates 2, a pole 23 is disposed on the cover plate 2, and the pole 23 is disposed eccentrically on the cover plate 2, the battery adapter 1 may also adopt the structure disclosed in the above embodiment.

In some other embodiments, when two polar posts 23 with the same polarity are disposed on the cover 2, and when the two polar posts 23 are symmetrical with respect to the center of the cover 2, in order to satisfy that the battery adapter 1 can be connected with the two polar posts 23 with the same polarity at the same time, and ensure that the battery adapter 1 can avoid the explosion-proof valve G or the liquid injection hole Z, another structural mode of the battery adapter 1 is disclosed in this embodiment.

Specifically, referring to fig. 10 to 17, the top end of the third sheet 13 horizontally extends along the length direction of the first sheet 11 to the outside of the mounting cavity S to form a fourth sheet 14, and a post welding portion H is provided on the fourth sheet 14 for welding with the post 23 on the cover plate 2, and the through hole 122 is located at one end of the second sheet 12 away from the first sheet 11.

By adopting such a technical scheme, when assembling, laminating fourth lamellar body 14 and apron 2 bottom surface to make the utmost point post 23 on the apron 2 and the utmost point post welded part H cooperation on the fourth lamellar body 14, thereby realize that fourth lamellar body 14 and utmost point post 23 realize the welding, two utmost point posts 23 weld with fourth lamellar body 14 respectively, at this moment, installation cavity S opening direction is towards apron 2 one side, through seting up through-hole 122 on second lamellar body 12, can realize explosion-proof valve G or annotate liquid hole Z and realize the intercommunication through-hole 122 and installation cavity S, make things convenient for annotating the establishment of liquid passageway or the establishment of exhaust passage. Meanwhile, the through hole 122 is located at one end of the second sheet body 12 far away from the first sheet body 11, so that the through hole 122 is close to one side of the cover plate 2, and after the tab 31 is welded with the tab welding portion 121 on the second sheet body 12, the redundant tab 31 can be inserted into the mounting cavity S through the through hole 122, so that the redundant tab 31 is hidden, and the contact short circuit between the tab 31 and the housing 4 is avoided.

The structure of the battery adapter 1 can enable the battery adapter 1 to provide a liquid injection or exhaust channel for the cover plate 2, and can realize welding with the bipolar column 23, so that the adaptability is strong.

In the above embodiment, the pole welding portion H on the fourth sheet body 14 is also provided in a recessed groove structure, so that the pole 23 is conveniently embedded in the recessed groove, and also laser welding is conveniently performed.

An embodiment of the present invention further provides a battery tab switching structure, which is shown in fig. 3-18, and includes a cover plate 2, two core packages 3, and the battery switching member 1 disclosed in the foregoing embodiment, wherein the tabs 31 with the same polarity on the two core packages 3 are welded with tab welding portions 121 on the battery switching member 1 respectively, and the first sheet 11 is electrically connected with the cover plate 2.

Because the battery adapter 1 adopts a three-dimensional structure, and is not a traditional plane structure, the tab 31 of the core pack 3 is not required to be welded by adopting a tab 31 butterfly welding process mode and the battery adapter 1, after the battery adapter 1 and the cover plate 2 are welded, the tab 31 can be directly welded with the welding part on the second sheet body 12 in parallel, the tab 31 on the two core packs 3 is independently welded with the second sheet body 12, after the welding is finished, the two core packs 3 are mutually parallel and close, the core pack 3 is not required to be turned over in the shell entering process of the core pack 3, so that the tab 31 is not required to be bent, the problem of stress concentration and breakage of the tab 31 in the bending process is effectively avoided, the length of the tab 31 is reduced, the occupation of the tab 31 to the internal space of the battery in the bending process is avoided, the space waste caused by the folding of the tab 31 is reduced to the maximum extent, and the energy density of the battery is improved.

The cover plate 2 disclosed in this embodiment includes a light aluminum plate 21 and a lower plastic member 22 fixedly disposed on the bottom surface of the light aluminum plate 21, a pole 23 is disposed on the cover plate 2, and the battery adapter 1 is fixedly disposed on the central axis of the bottom surface of the lower plastic member 22, and a pole welding portion H on the first sheet 11 or the fourth sheet 14 is welded with the pole 23.

In the above embodiment, the pole 23 is fixedly connected with the cover plate 2 in an insulating manner, and the lower plastic member 22 is fixed on the bottom surface of the optical aluminum plate 21, so as to establish electrical isolation between the core pack 3 and the optical aluminum plate 21. The fixing manner of the pole 23 on the light aluminum plate 21 may be a conventional manner in the prior art, and this is not limited to this embodiment, and in this embodiment, the pole 23 passes through the lower molding 22 to be welded with the battery adapter 1.

When the core pack 3 of the blade battery is provided with the single-side tab 31, two polar posts 23 with different polarities are respectively positioned at two ends of the length direction of the optical aluminum plate 21, and each polar post 23 is welded with the corresponding polar tab 31 on the core pack 3 through one battery adapter 1, so that the polar post 23 is welded with the polar post welding part H on the first sheet 11 in the structural mode.

When the core package 3 of the blade battery is provided with two side electrode lugs 31, the center of the optical aluminum plate 21 is provided with an explosion-proof valve G or a liquid injection hole Z, the optical aluminum plate 21 is provided with two polar posts 23 with the same polarity, and when the two polar posts 23 are symmetrical relative to the center of the optical aluminum plate 21, a battery adapter 1 is arranged between the cover plate 2 and the core package 3, the mounting cavity S of the whole battery adapter 1 is buckled at the center of the bottom surface of the lower plastic piece 22, and the two polar posts 23 are respectively welded with the fourth sheet 14.

In both the above two modes, the tab 31 on the core pack 3 is welded to the tab welding portion 121 on the second sheet 12, and then the extra tab 31 is inserted into the mounting cavity S through the through hole 122 to be hidden.

As some preferred embodiments, the distance between the outermost sides of the two second sheets 12 is half the total thickness of the two core packs 3. Therefore, after the tabs 31 on the core bags 3 are pre-welded into the tab 31 groups, the tab 31 groups are generally positioned at the center of the thickness direction of the core bags 3, so that after the two core bags 3 are stacked together, the spacing between the tab 31 groups on the two core bags 3 and the spacing between the outermost sides of the two second sheet bodies 12 are matched, the tab 31 groups on the core bags 3 can be welded with the outer sides of the second sheet bodies 12 in parallel, the welding operation is convenient, and bending of the tab 31 cannot be caused in the welding process. Meanwhile, after the welding of the tab 31 and the second sheet body 12 is completed, the tab 31 and the second sheet body 12 are connected in parallel in the height direction of the battery after the whole core pack 3 is put into the shell for encapsulation, the situation mode of relative twisting, bending and connecting stress cannot occur, and the safety and reliability of connection of the tab 31 and the battery adapter 1 are improved.

As some preferred embodiments, the two ends of the lower plastic part 22 in the length direction are respectively provided with a limiting part 221, and the height of the battery adapter 1 is less than or equal to the height of the limiting part 221. Therefore, the position of the end part of the core pack 3 can be limited through the limiting part 221, and the situation that the core pack 3 is axially connected with the battery adapter 1 in the shell 4 after the core pack 3 is put into the shell to cause short circuit of the pole piece in the core pack 3 is avoided.

Based on the same inventive concept, the invention also discloses a lithium battery, which comprises a shell 4 and the battery tab switching structure disclosed in the embodiment, wherein the core pack 3 is arranged in the shell 4, and the cover plate 2 is fixedly connected with the opening end of the shell 4. The battery tab switching structure disclosed by the invention can be suitable for blade-shaped lithium batteries with single-side tab 31 and also suitable for blade-shaped lithium batteries with double-side tab 31.

The foregoing description of the preferred embodiments of the invention 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 invention.

Claims

1. A battery adapter, comprising:

the first sheet body (11) is used for being electrically connected with the cover plate (2);

Two second sheet bodies (12) are respectively positioned at two sides of the same surface of the first sheet body (11) in the width direction, the second sheet bodies (12) are vertically and fixedly connected with the first sheet body (11), tab welding parts (121) are arranged on the surfaces, facing away from each other, of the two second sheet bodies (12), and the tab welding parts (121) are used for welding with tabs (31) on the core bag (3);

The two third sheet bodies (13) are respectively positioned at the other two sides of the first sheet body (11), the third sheet bodies (13) are vertically connected with the first sheet body (11) and the second sheet body (12), and the first sheet body (11), the second sheet body (12) and the third sheet body (13) are jointly enclosed to form an installation cavity (S);

The second sheet body (12) is provided with a through hole (122), and the through hole (122) is used for allowing the lug (31) on the core pack (3) to pass through the outer side of the second sheet body (12) and enter the mounting cavity (S).

2. The battery adapter according to claim 1, wherein the first sheet body (11) is provided with a pole welding part (H) for welding with a pole (23) on the cover plate (2), and the through hole (122) is positioned at one end of the second sheet body (12) close to the first sheet body (11).

3. The battery adapter according to claim 1, wherein the top end of the third sheet body (13) horizontally extends to the outside of the mounting cavity (S) along the length direction of the first sheet body (11) to form a fourth sheet body (14), a pole welding part (H) is arranged on the fourth sheet body (14) and used for welding with a pole (23) on the cover plate (2), and the through hole (122) is positioned at one end of the second sheet body (12) far away from the first sheet body (11).

4. The battery tab switching structure is characterized by comprising a cover plate (2), two core bags (3) and the battery switching piece according to claim 2 or 3, wherein tabs (31) with the same polarity on the two core bags (3) are welded with tab welding parts (121) on the battery switching piece respectively, and a first sheet body (11) is electrically connected with the cover plate (2).

5. The battery tab switching structure according to claim 4, wherein the cover plate (2) comprises a light aluminum plate (21) and a lower plastic part (22) fixedly arranged on the bottom surface of the light aluminum plate (21), a pole (23) is arranged on the cover plate (2), the battery switching part is fixedly arranged at the central axis of the bottom surface of the lower plastic part (22), and a pole welding part (H) on the first sheet body (11) or the fourth sheet body (14) is welded with the pole (23).

6. The battery tab switching structure of claim 5, wherein the distance between the outermost sides of the two second sheet bodies (12) is half of the total thickness of the two core bags (3).

7. The battery tab switching structure of claim 5, wherein the lower plastic member (22) is provided with a limiting portion (221) at each of two ends in a longitudinal direction, and a height of the battery tab switching member is smaller than or equal to a height of the limiting portion (221).

8. The lithium battery is characterized by comprising a shell (4) and the battery tab switching structure according to any one of claims 4 to 7, wherein the core pack (3) is arranged in the shell (4), and the cover plate (2) is fixedly connected with the opening end of the shell (4).