A battery adapter, a battery tab adapter structure, and a lithium battery

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

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery adapter, a battery tab adapter structure, and a lithium battery. Background Art

[0002] Blade batteries, a key battery type in electric vehicles and power storage, are gaining widespread market acceptance and recognition due to their high energy density, superior safety performance, and long lifespan. Blade batteries are currently manufactured using a lamination process, where multiple battery electrodes are stacked layer by layer to form the battery core. In this process, each electrode has tabs, and the number and thickness of the tabs significantly impact the overall battery performance.

[0003] In the manufacturing process of square batteries, the butterfly welding process is usually used in the prior art for welding the tabs and cover plates. The main process of this process is: first, the two battery core packs are placed in parallel, and the tabs between the two are welded through an adapter. After the welding is completed, the adapter is welded to the battery cover plate. After the welding is completed, the core pack is folded and closed from the horizontal state and installed in the battery casing. This welding method is relatively simple to operate and is suitable for welding battery core packs of a certain size, but it has obvious defects in the application of blade batteries.

[0004] Because the core pack of the blade battery is longer, the number and thickness of the tabs are significantly increased, which leads to problems in the butterfly welding process when the core pack is folded into the shell. First, when the tab is folded, stress concentration is easily generated in the tab, increasing the risk of bending and breaking of the tab. Secondly, when the longer core pack is folded, the thickness of the tab will cause the folded area to occupy a larger space in the shell, affecting the energy density of the battery. In addition, due to the large length of the core pack, it will be twisted or deformed due to the folding action, causing damage to its structure. Summary of the Invention

[0005] In view of this, the present invention proposes a battery adapter, a battery tab adapter structure and a lithium battery to solve the problem of tab damage caused by tab thickness and stress concentration during tab folding when the blade uses the tab butterfly welding process, and the problem of reduced battery energy density due to tab folding.

[0006] The technical solution of the present invention is achieved as follows:

[0007] In a first aspect, the present invention provides a battery adapter, comprising:

[0008] The first sheet is used for electrically connecting to the cover plate;

[0009] The two second sheets are respectively located on both sides of the width direction of the same surface of the first sheet. The second sheets are vertically fixedly connected to the first sheet. The facing sides of the two second sheets are each provided with a tab welding portion, which is used to weld to the tab on the core package.

[0010] On the basis of the above technical solution, preferably, two third sheets are further included, which are respectively located on the other two sides of the first sheet. The third sheet is vertically connected to the first sheet and the second sheet. The first sheet, the second sheet and the third sheet together enclose an installation cavity.

[0011] On the basis of the above technical solution, preferably, a through hole is opened on the second sheet, and the through hole is used for the tab on the core package to pass through from the outside of the second sheet and enter the installation cavity.

[0012] In some embodiments, a pole welding portion is provided on the first sheet for welding to the pole on the cover plate, and the through hole is located at one end of the second sheet close to the first sheet.

[0013] As some other embodiments, the top end of the third sheet extends horizontally along the length direction of the first sheet toward the outside of the installation cavity to form a fourth sheet, and a pole welding portion is provided on the fourth sheet for welding to the pole on the cover plate, and the through hole is located at the end of the second sheet away from the first sheet.

[0014] In the second aspect, the present invention also discloses a battery tab adapter structure, including a cover plate, two core packs and the battery adapter described in the first aspect, the tabs of the same polarity on the two core packs are respectively welded to the tab welding parts on the battery adapter, and the first sheet and the cover plate are electrically connected.

[0015] Based on the above technical solution, preferably, the cover plate includes a plain aluminum plate and a lower plastic part fixedly arranged on the bottom surface of the plain aluminum plate, the cover plate is provided with a pole, the battery adapter is fixedly arranged at the central axis of the bottom surface of the lower plastic part, and the pole welding part on the first sheet or the fourth sheet is welded to the pole.

[0016] Based on the above technical solution, preferably, the distance between the outermost sides of the two second sheets is half of the total thickness of the two core packages.

[0017] On the basis of the above technical solution, preferably, both ends of the lower plastic part in the length direction are respectively provided with limiting parts, and the height of the battery adapter is less than or equal to the height of the limiting parts.

[0018] In a third aspect, the present invention further discloses a lithium battery, comprising a shell and the battery tab adapter structure described in the second aspect, wherein the core pack is disposed in the shell, and the cover is fixedly connected to the open end of the shell.

[0019] The present invention has the following beneficial effects compared to the prior art:

[0020] (1) Compared with the traditional tab butterfly welding process, since the tab is welded in parallel with the tab welding part on the second sheet, after the tab welding on the battery adapter and the blade battery core pack is completed, the two core packs are parallel to each other. During the core pack shelling process, there is no need to flip the core pack, so there is no need to bend the tab, which effectively avoids the tab stress concentration and fracture problems during the bending process. The parallel welding design reduces the length of the tab, avoids the tab 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.

[0021] (2) The tabs on the core package are welded in parallel with the tab welding parts on the second sheet. The process is simple to operate. The core package can be directly inserted into the shell during the shell insertion process without turning the core package over. This can avoid the distortion and deformation damage caused by the turning process of the core package with a large length, thereby improving the safety of the core package during the manufacturing process.

[0022] (3) By opening a through hole in the second sheet, the excess tabs can safely enter the installation cavity through the through hole, avoiding contact between the tabs and the battery shell, thereby reducing the battery safety risk caused by short circuit.

[0023] (4) By making the distance between the outermost sides of the two second sheets half the total thickness of the two core packs, the tab group on the core pack can be welded parallel to the outer sides of the second sheets, making the welding operation convenient and preventing the tabs from bending during the welding process. At the same time, after the tabs and the second sheets are welded, and the entire core pack is encapsulated in the shell, the tabs and the second sheets remain parallel in the battery height direction, preventing relative twisting, bending, and connection stress, thereby improving the safety and reliability of the connection between the tabs and the battery adapter.

[0024] (5) A fourth sheet is formed by extending horizontally from the top of the third sheet along the length of the first sheet toward the outside of the mounting cavity, and a pole welding portion is provided on the fourth sheet. A through hole is provided at the end of the second sheet away from the first sheet. This structural arrangement is applicable to situations where there are double-sided pole tabs, an explosion-proof valve or liquid injection hole is provided in the center of the cover plate, and bipolar poles are symmetrically provided on the cover plate. This allows the battery adapter to provide a liquid injection or exhaust channel for the cover plate and can also be welded to the bipolar poles, thus having strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a front structural schematic diagram of the first embodiment of the battery adapter disclosed in the present invention;

[0027] Figure 2 This is a schematic diagram of the back structure of the first embodiment of the battery adapter disclosed in the present invention;

[0028] Figure 3 This is a schematic diagram of the first assembly structure of the battery adapter and the cover plate disclosed in the present invention;

[0029] Figure 4 This is a schematic diagram of the three-dimensional structure of the first embodiment of the battery tab adapter structure disclosed in the present invention;

[0030] Figure 5 for Figure 4 A partial enlarged view of the middle part;

[0031] Figure 6 This is a schematic diagram of the three-dimensional structure of the first embodiment of the lithium battery disclosed in the present invention;

[0032] Figure 7 A top view of a first embodiment of a lithium battery disclosed in the present invention;

[0033] Figure 8 for Figure 7 Plane section view at the middle BB;

[0034] Figure 9 for Figure 7 Plane section view at CC;

[0035] Figure 10 This is a front structural schematic diagram of a second embodiment of the battery adapter disclosed in the present invention;

[0036] Figure 11 This is a schematic diagram of the back structure of the second embodiment of the battery adapter disclosed in the present invention;

[0037] Figure 12 This is a schematic diagram of a second assembly structure of the battery adapter and the cover plate disclosed in the present invention;

[0038] Figure 13 This is a schematic diagram of the three-dimensional structure of the second embodiment of the battery tab adapter structure disclosed in the present invention;

[0039] Figure 14 for Figure 13 A partial enlarged view of point D in the middle;

[0040] Figure 15 This is a schematic diagram of the three-dimensional structure of the second embodiment of the lithium battery disclosed in the present invention;

[0041] Figure 16 A top view of a first embodiment of a lithium battery disclosed in the present invention;

[0042] Figure 17 for Figure 16 Plane section view at EE;

[0043] Figure 18 for Figure 16 Plane section view at FF in the middle;

[0044] Reference numerals:

[0045] 1. Battery adapter; 11. First plate; 12. Second plate; 121. Tab welding part; 13. Third plate; S. Mounting cavity; 122. Through hole; H. Post welding part; 14. Fourth plate; 2. Cover plate; 3. Core pack; 31. Tab; 21. Plain aluminum plate; 22. Lower plastic part; 23. Post; 221. Stopper; 4. Housing; G. Explosion-proof valve; Z. Injection hole; DETAILED DESCRIPTION

[0046] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] like Figure 1 As shown, combined Figure 2 、 4 , 5, 8, 10 and 11, an embodiment of the present invention discloses a battery adapter for achieving the connection between the tab 31 and the cover 2. Specifically, the battery adapter 1 disclosed in this embodiment includes a first sheet 11 and two second sheets 12.

[0048] The first sheet 11 is used to be electrically connected to the cover plate 2 , specifically, to be electrically connected to the pole 23 on the cover plate 2 .

[0049] Two second sheets 12 are provided, one on each side of the first sheet 11 in the width direction, and are fixedly connected vertically to the first sheet 11. With this arrangement, the second sheet 12 is structurally a vertically arranged sheet, perpendicular to the first sheet 11, thereby forming a three-dimensional structure. The two second sheets 12 are provided with a tab welding portion 121 on the facing side, and the tab welding portion 121 is used to weld to the tab 31 on the core package 3. This structural arrangement allows the core package 3 to be arranged parallel to the second sheet 12, and the tab 31 on the core package 3 can be directly welded parallel to the adapter without bending.

[0050] Compared with the traditional butterfly welding process of the pole tab 31, since the pole tab 31 is welded in parallel with the pole tab welding part 121 on the second sheet 12, after the welding of the pole tab 31 on the battery adapter 1 and the blade battery core pack 3 is completed, the two core packs 3 are parallel to each other. During the process of the core pack 3 entering the shell, there is no need to flip the core pack 3, and thus there is no need to bend the pole tab 31, which effectively avoids the stress concentration and fracture problems of the pole tab 31 during the bending process. The parallel welding design reduces the length of the pole tab 31, avoids the pole tab 31 occupying the internal space of the battery when bending, minimizes the space waste caused by the folding of the pole tab 31, and improves the energy density of the battery.

[0051] The manufacturing process that does not require bending simplifies the production steps and reduces the complex operations and potential damage risks caused by bending. This not only reduces the process difficulty, but also improves production efficiency and reduces the failure rate during the production process.

[0052] In addition, it is worth noting that due to the use of the three-dimensional battery adapter 1 disclosed in this embodiment, the two core packs 3 of the blade battery are not laid flat between the battery adapter 1 by butterfly welding the pole ears 31, but the pole ears 31 on the core pack 3 are directly welded in parallel with the pole ear welding portion 121 on the second sheet 12. The process is simple to operate, and the core pack 3 can be directly inserted into the shell 4 during the shell insertion process without flipping the core pack 3. This can avoid twisting, deformation and damage to the core pack 3 with a larger length during the flipping process, thereby improving the safety of the core pack 3 during the manufacturing process.

[0053] As some preferred embodiments, the battery adapter 1 of this embodiment also includes two third sheets 13, which are respectively located on the other two sides of the first sheet 11. The third sheet 13 is vertically connected to the first sheet 11 and the second sheet 12. The first sheet 11, the second sheet 12 and the third sheet 13 together enclose an installation cavity S.

[0054] By adopting the above technical solution and adding the third plate 13, the battery adapter 1 forms a more stable three-dimensional structure, thereby enhancing the mechanical stability of the entire battery adapter 1. Furthermore, the third plate 13 reinforces the support at both ends of the second plate 12, making the second plate 12 more structurally strong within the entire battery adapter 1, and improving the stability and reliability of the welding between the tab 31 and the tab welding portion 121 on the second plate 12.

[0055] The mounting cavity S is formed to accommodate the excess length of the tab 31 after the tab 31 is welded.

[0056] Since the core pack 3 of the blade battery adopts a laminated structure, each pole piece has a pole ear 31 at the end. These pole ears 31 need to be pre-welded before being welded to the battery adapter 1 so that these pole ears 31 form a pole ear 31 group. These pole ears 31 must have a certain length to ensure that the pole ear 31 group meets a certain length after pre-welding. Since the pole ear 31 group has a certain length, the length of the second sheet 12 is limited, and the pole ear 31 group cannot be completely welded to the welding part of the second sheet 12. This will cause the pole ear 31 to have excess length. The excess length of the pole ear 31 may touch the shell 4, which will cause a short circuit. If manual trimming is used, the process will be complicated.

[0057] To this end, this embodiment provides a through-hole 122 on the second sheet 12. The through-hole 122 is used to allow the tab 31 on the core package 3 to pass through the outside of the second sheet 12 and enter the installation cavity S. This arrangement eliminates the need for manual trimming of the excess length of the tab 31. During production, workers only need to guide the tab 31 through the through-hole 122 into the installation cavity S, thereby simplifying the manufacturing process and reducing labor costs and operational complexity. The excess tab 31 safely enters the installation cavity S through the through-hole 122, preventing the tab 31 from contacting the battery housing 4, thereby reducing the battery safety risk caused by short circuits.

[0058] The core pack 3 of the blade battery has a single-sided output tab 31 form and a double-sided output tab 31 form. For these two forms, this embodiment discloses two structures of battery adapters 1 to meet different usage requirements.

[0059] Refer to the attached Figure 3-9As shown, when the core pack 3 of the blade battery is a single-sided tab 31, the pole 23 on the cover plate 2 is respectively located at both ends of the length direction of the cover plate 2. At this time, the explosion-proof valve G and the injection hole Z on the cover plate 2 are located between the two poles 23. In order to realize the connection between the battery adapter 1 and the tab 31 and the cover plate 2, the method adopted in this embodiment is to provide a pole welding portion H on the first sheet 11 for welding with the pole 23 on the cover plate 2. Specifically, the pole welding portion H can be provided on the side of the first sheet 11 away from the installation cavity S. The pole welding portion H can be a recessed groove, so that the pole 23 is embedded in the recessed groove. At this time, the first sheet 11 and the bottom surface of the cover plate 2 are fitted together, and the pole welding portion H and the pole 23 can be welded by laser penetration welding through the installation cavity S.

[0060] The mounting cavity S on the battery adapter 1 faces the side of the core pack 3. In order to facilitate the welding of the pole tab 31 to the second sheet 12, the excess pole tab 31 can enter the mounting cavity S and be hidden. In this embodiment, the through hole 122 is set at the end of the second sheet 12 close to the first sheet 11. Therefore, after the first sheet 11 and the pole 23 of the cover plate 2 are welded, the core pack 3 is placed parallel to the second sheet 12, so that the part of the pole tab 31 close to the core pack 3 is welded to the pole tab welding part 121 along the end of the second sheet 12 away from the first sheet 11. After the welding is completed, the excess pole tab 31 is inserted into the mounting cavity S from the through hole 122 to be hidden.

[0061] When the core pack 3 of the blade battery has double-sided tabs 31, as an embodiment, when the pole 23 is located at the center of the cover plate 2, the battery adapter 1 has the same structure as that disclosed in the above embodiment. When the explosion-proof valve G or the injection hole Z is located at the center of one of the cover plates 2, a pole 23 is provided on the cover plate 2, and the pole 23 is eccentrically arranged on the cover plate 2, the battery adapter 1 can also adopt the structure disclosed in the above embodiment.

[0062] In some other embodiments, when two poles 23 of the same polarity are provided on the cover plate 2, and the two poles 23 are symmetrical with respect to the center of the cover plate 2, in order to satisfy that the battery adapter 1 can be connected to the two poles 23 of the same polarity at the same time, and to ensure that the battery adapter 1 can avoid the explosion-proof valve G or the injection hole Z, this embodiment discloses another structural method of the battery adapter 1.

[0063] For details, please refer to the attached Figure 10-17 As shown, the top end of the third sheet 13 extends horizontally along the length direction of the first sheet 11 toward the outside of the installation cavity S to form a fourth sheet 14. The fourth sheet 14 is provided with a pole welding portion H for welding to the pole 23 on the cover plate 2. The through hole 122 is located at the end of the second sheet 12 away from the first sheet 11.

[0064] With this technical solution, during assembly, the fourth sheet 14 is fitted to the bottom surface of the cover plate 2, and the pole 23 on the cover plate 2 is matched with the pole welding portion H on the fourth sheet 14, thereby achieving welding of the fourth sheet 14 and the pole 23. The two poles 23 are welded to the fourth sheet 14 respectively. At this time, the opening direction of the installation cavity S is toward the side of the cover plate 2. By opening a through hole 122 on the second sheet 12, the explosion-proof valve G or the injection hole Z can be connected to the installation cavity S through the through hole 122, facilitating the establishment of an injection channel or an exhaust channel. At the same time, the through hole 122 is located at the end of the second sheet 12 away from the first sheet 11, so that the through hole 122 is close to the side of the cover plate 2. This facilitates the insertion of the excess pole tab 31 into the installation cavity S through the through hole 122 after the pole tab 31 is welded to the pole tab welding portion 121 on the second sheet 12, thereby hiding the excess pole tab 31 and preventing the pole tab 31 from contacting and short-circuiting with the housing 4.

[0065] The structure of the battery adapter 1 can not only provide a liquid injection or exhaust channel for the cover plate 2, but also be welded to the bipolar column 23, and has strong adaptability.

[0066] In the above embodiment, the pole welding portion H on the fourth piece 14 is also configured with a recessed groove structure, which facilitates the insertion of the pole 23 into the recessed groove and also facilitates laser welding.

[0067] An embodiment of the present invention further provides a battery tab transfer structure, Figure 3-18 As shown, it includes a cover plate 2, two core packs 3 and the battery adapter 1 disclosed in the above embodiment. The tabs 31 of the same polarity on the two core packs 3 are respectively welded to the tab welding parts 121 on the battery adapter 1, and the first sheet 11 and the cover plate 2 are electrically connected.

[0068] Since the battery adapter 1 adopts a three-dimensional structure rather than a traditional planar structure, the core pack 3 pole ear 31 of this embodiment does not need to be welded to the battery adapter 1 using the butterfly welding process of the pole ear 31. After the battery adapter 1 and the cover plate 2 are welded, the pole ear 31 can be directly welded in parallel with the welding portion on the second sheet 12. The pole ears 31 on the two core packs 3 are welded to the second sheet 12 separately. After the welding is completed, the two core packs 3 are parallel to each other. During the process of the core pack 3 entering the shell, there is no need to flip the core pack 3, and thus there is no need to bend the pole ear 31. This effectively avoids the stress concentration and fracture problems of the pole ear 31 during the bending process. The parallel welding design reduces the length of the pole ear 31, avoids the pole ear 31 occupying the internal space of the battery when bending, minimizes the space waste caused by the folding of the pole ear 31, and improves the energy density of the battery.

[0069] The cover plate 2 disclosed in this embodiment includes a plain aluminum plate 21 and a lower plastic part 22 fixedly arranged on the bottom surface of the plain aluminum plate 21. A pole 23 is provided on the cover plate 2. The battery adapter 1 is fixedly arranged at the central axis of the bottom surface of the lower plastic part 22. The pole welding part H on the first sheet 11 or the fourth sheet 14 is welded to the pole 23.

[0070] In the above embodiment, the pole 23 and the cover plate 2 are insulated and fixedly connected, and the lower plastic part 22 is fixed to the bottom surface of the plain aluminum plate 21 to establish electrical isolation between the core pack 3 and the plain aluminum plate 21. The pole 23 can be fixed to the plain aluminum plate 21 using conventional methods in the prior art, and this embodiment is not limited thereto. In this embodiment, the pole 23 passes through the lower plastic part 22 for welding to the battery adapter 1.

[0071] When the core pack 3 of the blade battery has a single-sided pole ear 31, two poles 23 of different polarities are respectively located at the two ends of the length direction of the plain aluminum plate 21. At this time, each pole 23 is welded through a battery adapter 1 and the pole ear 31 of the corresponding polarity on the core pack 3. Under this structural method, the pole 23 is welded to the pole welding part H on the first sheet 11.

[0072] When the core pack 3 of the blade battery has double-sided pole ears 31, an explosion-proof valve G or a liquid injection hole Z is opened at the center of the plain aluminum plate 21, two poles 23 of the same polarity are set on the plain aluminum plate 21, and the two poles 23 are symmetrical relative to the center of the plain aluminum plate 21, a battery adapter 1 is set between the cover plate 2 and the core pack 3, and the installation cavity S of the entire battery adapter 1 is buckled at the center of the bottom surface of the lower plastic part 22, and the two poles 23 are respectively welded to the fourth sheet 14.

[0073] In both of the above methods, the tabs 31 on the core package 3 are welded to the tab welding portion 121 on the second sheet 12 , and then the excess tabs 31 are inserted into the installation cavity S through the through holes 122 to be hidden.

[0074] As some preferred embodiments, the spacing between the outermost sides of the two second sheets 12 is half the total thickness of the two core packages 3. Therefore, after the tabs 31 on the core package 3 are pre-welded into a tab 31 group, the tab 31 group is roughly located at the center of the thickness direction of the core package 3. In this way, after the two core packages 3 are stacked together, the spacing between the tab 31 groups on the two core packages 3 is adapted to the spacing between the outermost sides of the two second sheets 12. As a result, the tab 31 group on the core package 3 can be welded parallel to the outer sides of the second sheets 12, and the welding operation is convenient without causing bending of the tab 31 during the welding process. At the same time, after the tab 31 and the second sheet 12 are welded, after the entire core package 3 is encapsulated in the shell, the tab 31 and the second sheet 12 remain parallel in connection in the battery height direction, and relative twisting, bending, and connection stress will not occur, thereby improving the safety and reliability of the connection between the tab 31 and the battery adapter 1.

[0075] In some preferred embodiments, limiters 221 are provided at both ends of the lower plastic part 22 in the longitudinal direction, and the height of the battery adapter 1 is less than or equal to the height of the limiters 221. Thus, the limiters 221 can limit the position of the ends of the core pack 3, preventing the core pack 3 from connecting axially with the battery adapter 1 in the shell 4 after the core pack 3 is inserted into the shell, thereby preventing the internal electrodes of the core pack 3 from short-circuiting.

[0076] Based on the same inventive concept, the present invention further discloses a lithium battery comprising a housing 4 and the battery tab adapter structure disclosed in the above embodiment, wherein the core pack 3 is disposed in the housing 4, and the cover plate 2 is fixedly connected to the open end of the housing 4. The battery tab adapter structure disclosed in the present invention can be applied to blade-shaped lithium batteries with tabs 31 on one side or on blade-shaped lithium batteries with tabs 31 on both sides.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery adapter, characterized in that: include: A first sheet (11) is used for being electrically connected to the cover plate (2); Two second sheets (12) are respectively located on both sides of the same surface of the first sheet (11) in the width direction. The second sheets (12) are vertically fixedly connected to the first sheet (11). The two second sheets (12) are each provided with a tab welding portion (121) on a side facing away from each other. The tab welding portion (121) is used for welding to the tab (31) on the core package (3). It also includes two third sheets (13), which are respectively located on the other two sides of the first sheet (11), and the third sheets (13) are vertically connected to the first sheet (11) and the second sheet (12). The first sheet (11), the second sheet (12) and the third sheet (13) are enclosed together to form a mounting cavity (S); 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 package (3) to pass through the outside of the second sheet (12) and enter the installation cavity (S).

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

3. The battery adapter according to claim 1, wherein: The top end of the third sheet (13) extends horizontally along the length direction of the first sheet (11) toward the outside of the installation cavity (S) to form a fourth sheet (14). The fourth sheet (14) is provided with a pole welding portion (H) for welding with the pole (23) on the cover plate (2). The through hole (122) is located at an end of the second sheet (12) away from the first sheet (11).

4. A battery tab adapter structure, characterized in that: It comprises a cover plate (2), two core packs (3) and the battery adapter as claimed in claim 2 or 3, wherein the tabs (31) of the same polarity on the two core packs (3) are respectively welded to the tab welding parts (121) on the battery adapter, and the first sheet (11) and the cover plate (2) are electrically connected.

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

6. The battery tab adapter structure according to claim 5, wherein: The distance between the outermost sides of the two second sheets (12) is half the total thickness of the two core packages (3).

7. The battery tab adapter structure according to claim 5, wherein: Limiting portions (221) are respectively provided at both ends of the lower plastic part (22) in the length direction, and the height of the battery adapter is less than or equal to the height of the limiting portions (221).

8. A lithium battery, characterized in that: It comprises a shell (4) and the battery tab transfer 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 to the open end of the shell (4).

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