Battery adapter, battery tab adapter structure and lithium battery

Abstract

The invention provides a battery adapter, a battery tab adapter structure and a lithium battery, and relates to the technical field of batteries, the battery adapter comprises a first sheet body used for being electrically connected with a cover plate; the two second sheet bodies are located on the two sides of the same surface of the first sheet body in the width direction respectively, the second sheet bodies are perpendicularly and fixedly connected with the first sheet body, the opposite faces of the two second sheet bodies are each provided with a tab welding part, and the tab welding parts are used for being welded to tabs on a core package. Compared with the traditional tab butterfly welding process, the tab is welded with the tab welding part on the second sheet body in parallel, the core package does not need to be overturned in the process of putting the core package into the shell, so that the tab does not need to be bent, the problems of stress concentration and breakage of the tab in the bending process are effectively avoided, the tab length is reduced due to the parallel welding design, and the production efficiency is improved. The occupation of the internal space of the battery when the tab is bent is avoided, the space waste caused by the folding of the tab is reduced to the greatest extent, and the energy density of the battery is improved.

Description

Technical Field

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

[0002] As an important type of battery in the field of electric vehicles and power storage, blade batteries are gradually being widely used and recognized by the market due to their high energy density, good safety performance and long life. At present, the core pack of blade batteries is mostly made by stacking process, that is, multiple battery pole pieces are stacked layer by layer to form a battery core pack. In this process, each pole piece has a pole ear, and the number and thickness of the pole ears have an important impact on the overall performance of the battery.

[0003] In the manufacturing process of square batteries, the butterfly welding process is usually used in the prior art for welding the pole ears and cover plates. The main process of this process is: first, place the two battery core packs in parallel, weld the pole ears between the two through an adapter, and after welding, weld the adapter to the battery cover plate. After welding, the core pack is folded and closed from a 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 exposes obvious defects in the application of blade batteries.

[0004] Since 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 prone to occur 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 folding 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 is using 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 in this way:

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

[0008] A first sheet body, used for electrically connecting with the cover plate;

[0009] The two second sheets are 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. The facing sides of the two second sheets are provided with tab welding parts, which are used for welding with the tabs 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, and 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] As 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 with the pole on the cover plate, and the through hole is located at one end of the second sheet away from the first sheet.

[0014] In the second aspect, the present invention further discloses a battery tab adapter structure, comprising a cover plate, two core packs and the battery adapter described in the first aspect, wherein 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] On the basis of 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, 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 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, limiting parts are respectively provided at both ends of the lower plastic part in the length direction, 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 arranged in the shell, and the cover plate is fixedly connected to the open end of the shell.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[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 stress concentration and fracture problems of the tab during the bending process. The parallel welding design reduces the length of the tab and avoids the tab occupying the internal space of the battery when the tab is bent, thereby minimizing the space waste caused by the tab folding and improving 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 flipping the core package. This can avoid the distortion and deformation damage caused by the flipping 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, thereby 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 packages, the tab group on the core package can be welded parallel to the outer sides of the second sheets, which is convenient to operate and will not cause bending of the tabs during welding. At the same time, after the tabs and the second sheets are welded, the tabs and the second sheets are connected in parallel in the height direction of the battery after the entire core package is packaged in the shell, and relative twisting, bending, and connection stress will not occur, thereby improving the safety and reliability of the connection between the tabs and the battery adapter.

[0024] (5) The fourth sheet is formed by horizontally extending the top of the third sheet along the length direction of the first sheet toward the outside of the installation cavity, and a pole welding portion is provided on the fourth sheet, and a through hole is provided at the end of the second sheet away from the first sheet. Such a structural setting can be applied to the case where the pole ears are output on both sides, an explosion-proof valve or a liquid injection hole is provided in the center of the cover plate, and bipolar columns are symmetrically provided on the cover plate, so that the battery adapter can provide a liquid injection or exhaust channel for the cover plate, and can also be welded with the bipolar columns, and has 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

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

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

[0028] Figure 3 It 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 It 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 It 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 BB in the middle;

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

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

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

[0037] Fig.12 A schematic diagram of a second assembly structure of a battery adapter and a cover plate disclosed in the present invention;

[0038] Fig.13 It 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] Fig.14 for Fig.13 A partial enlarged view of point D in the middle;

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

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

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

[0043] Fig.18 for Fig.16 Plane section view at FF;

[0044] Reference numerals:

[0045] 1. Battery adapter; 11. First sheet; 12. Second sheet; 121. Terminal ear welding part; 13. Third sheet; S. Mounting cavity; 122. Through hole; H. Terminal column welding part; 14. Fourth sheet; 2. Cover plate; 3. Core package; 31. Terminal ear; 21. Plain aluminum plate; 22. Lower plastic part; 23. Terminal column; 221. Limiting part; 4. Shell; 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 described embodiments 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 creative work 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, the embodiment of the present invention discloses a battery adapter for achieving the connection between the tab 31 and the cover plate 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 , and more specifically, to be electrically connected to the pole 23 on the cover plate 2 .

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

[0050] Compared with the traditional butterfly welding process of the pole ear 31, since the pole ear 31 and the pole ear welding part 121 on the second sheet 12 are welded in parallel, after the welding of the pole ear 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, and there is no need to flip the core pack 3 during the process of the core pack 3 entering the shell, so there is no need to bend the pole ear 31, which 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 and avoids the occupation of the internal space of the battery by the pole ear 31 when bending, thereby minimizing the space waste caused by the folding of the pole ear 31 and improving the energy density of the battery.

[0051] The manufacturing process that does not require bending simplifies the production steps and reduces the complicated 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 of the pole ears 31, but the pole ears 31 on the core pack 3 are directly welded in parallel with the pole ear welding parts 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 and deformation damage caused by the larger core pack 3 during the flipping process, thereby improving the safety of the core pack 3 during the manufacturing process.

[0053] As some preferred implementation modes, 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, the battery adapter 1 forms a more stable three-dimensional structure by adding the third sheet 13, so that the mechanical stability of the entire battery adapter 1 is enhanced. At the same time, the two ends of the second sheet 12 are reinforced by the third sheet 13, so that the second sheet 12 has a higher structural strength in the entire battery adapter 1, and the stability and reliability of the welding of the tab 31 and the tab welding part 121 on the second sheet 12 are improved.

[0055] The mounting cavity S is formed to accommodate the excess length of the pole tab 31 after the pole 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 with 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, which will cause the pole ear 31 to have excess length. The pole ear 31 with excess length 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, in this embodiment, a through hole 122 is provided on the second sheet 12, 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. With this arrangement, the excess length of the tab 31 does not need to be processed by manual trimming, and the worker only needs to guide the tab 31 through the through hole 122 to the installation cavity S during the production process, 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, avoiding contact between the tab 31 and the battery housing 4, thereby reducing the battery safety risk caused by short circuit.

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

[0059] See attached Figure 3-9As shown, when the core pack 3 of the blade battery is a single-sided pole ear 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 pole ear 31 and the cover plate 2, the method adopted in this embodiment is to provide a pole welding part H on the first sheet 11 for welding with the pole 23 on the cover plate 2. Specifically, the pole welding part H can be provided on the side of the first sheet 11 away from the installation cavity S. The pole welding part 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 fit together, and the pole welding part H and the pole 23 can be welded by laser penetration welding through the installation cavity S.

[0060] The installation cavity S on the battery adapter 1 faces the side of the core package 3. In order to facilitate the welding of the pole ear 31 to the second sheet 12, the excess pole ear 31 can enter the installation cavity S for hiding. 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 package 3 is placed parallel to the second sheet 12, so that the part of the pole ear 31 close to the core package 3 is welded to the pole ear 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 ear 31 is inserted into the installation cavity S from the through hole 122 to be hidden.

[0061] When the core pack 3 of the blade battery has a double-sided terminal lug 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, and a pole welding portion H is provided on the fourth sheet 14 for welding with the pole 23 on the cover plate 2, and the through hole 122 is located at the end of the second sheet 12 away from the first sheet 11.

[0064] With such a technical solution, during assembly, the fourth sheet 14 is fitted with 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, so that the fourth sheet 14 and the pole 23 are welded, and 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, which is convenient for the establishment of the injection channel or the 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, which is convenient for the tab 31 to be welded with the tab welding portion 121 on the second sheet 12. The excess tab 31 can be inserted into the installation cavity S through the through hole 122, so that the excess tab 31 is hidden and the tab 31 is prevented from contacting and short-circuiting the shell 4.

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

[0066] In the above embodiment, the pole welding portion H on the fourth sheet 14 is also arranged in a recessed groove structure, which facilitates the pole 23 to be embedded in the recessed groove and also facilitates laser welding.

[0067] An embodiment of the present invention further provides a battery tab transfer structure, referring to the attached 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 pole ears 31 of the same polarity on the two core packs 3 are respectively welded to the pole ear 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 pole ear 31 of the core pack 3 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 and close to each other. During the process of the core pack 3 being put into the shell, there is no need to flip the core pack 3, and thus there is no need to bend the pole ear 31, which 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 occupation of the internal space of the battery by the pole ear 31 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 arranged 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 bare aluminum plate 21 to establish electrical isolation between the core package 3 and the bare aluminum plate 21. The pole 23 can be fixed to the bare aluminum plate 21 in a conventional manner 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 with 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 a pole ear 31 of corresponding polarity on the core pack 3. Under this structural mode, 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 arranged 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 arranged 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 the above two 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 of 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 generally 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 tabs 31 groups on the two core packages 3 is adapted to the spacing between the outermost sides of the two second sheets 12, so that the tabs 31 group on the core package 3 can be maintained parallel to the outer side of the second sheet 12 for welding, and the welding operation is convenient without causing bending of the tabs 31 during the welding process. At the same time, after the tabs 31 and the second sheet 12 are welded, after the entire core package 3 is packaged in the shell, the tabs 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 tabs 31 and the battery adapter 1.

[0075] As some preferred embodiments, the lower plastic part 22 is provided with limiting parts 221 at both ends in the length direction, and the height of the battery adapter 1 is less than or equal to the height of the limiting parts 221. Thus, the limiting parts 221 can be used to limit the position of the ends of the core package 3, so as to avoid the core package 3 being connected to the battery adapter 1 in the axial direction of the shell 4 after the core package 3 is put into the shell, causing the internal electrode of the core package 3 to short-circuit.

[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 a blade-shaped lithium battery with a tab 31 on one side, or a blade-shaped lithium battery 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 protection scope 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); The 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 pole lug welding portion (121) on one side facing the other. The pole lug welding portion (121) is used for welding with the pole lug (31) on the core package (3).

2. The battery adapter according to claim 1, wherein: It 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) are jointly enclosed to form a mounting cavity (S).

3. The battery adapter according to claim 2, wherein: The second sheet (12) is provided with a through hole (122), and the through hole (122) is used for the pole ear (31) on the core package (3) to pass through the outside of the second sheet (12) and enter the installation cavity (S).

4. The battery adapter according to claim 3, wherein: The first sheet (11) 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 one end of the second sheet (12) close to the first sheet (11).

5. The battery adapter according to claim 3, wherein: The top end of the third sheet (13) horizontally extends 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); and the through hole (122) is located at an end of the second sheet (12) away from the first sheet (11).

6. A battery tab transfer structure, characterized in that: It comprises a cover plate (2), two core packs (3) and a battery adapter (1) as claimed in claim 4 or 5, wherein the pole tabs (31) of the same polarity on the two core packs (3) are respectively welded to the pole tab welding parts (121) on the battery adapter (1), and the first sheet (11) and the cover plate (2) are electrically connected.

7. The battery tab transfer structure according to claim 6, characterized in that: 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 (1) 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).

8. The battery tab adapter structure according to claim 7, characterized in that: The distance between the outermost sides of the two second sheets (12) is half of the total thickness of the two core packages (3).

9. The battery tab adapter structure according to claim 7, characterized in that: 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 (1) is less than or equal to the height of the limiting portions (221).

10. A lithium battery, characterized in that: It comprises a shell (4) and the battery tab transfer structure according to any one of claims 6 to 9, 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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