Battery adapter plate, battery tab adapter structure and lithium battery

Abstract

The utility model provides a battery switching piece, a battery tab switching structure and a lithium battery, and relates to the technical field of batteries, the battery switching piece comprises a first piece body, a second piece body, a third piece body and a fourth piece body, the first piece body is provided with a first surface and a second surface which are oppositely arranged, and the first surface is used for being electrically connected with a cover plate; and the second sheet body is vertically and fixedly arranged on the second surface, and the two side surfaces of the second sheet body are respectively used for being welded with tabs on the core package. Compared with the traditional butterfly welding process of a planar switching piece and a tab, the battery switching piece disclosed by the utility model is of a three-dimensional structure, and the tab and the second piece body are welded in parallel, so that the core bag does not need to be overturned and the tab does not need to be folded in the process of putting the core bag into a shell; the problems of stress concentration and breakage of the tabs in the folding process are effectively avoided, the length of the tabs is reduced due to the parallel welding design, the situation that the tabs occupy the internal space of the battery during folding is avoided, space waste caused by folding of the tabs is reduced to the maximum extent, and the energy density of the battery is improved.

Description

Technical Field

[0001] The utility model 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] With technological advancements and growing market demand, lithium batteries are increasingly being used in electric vehicles, portable electronic devices, and energy storage systems. Lithium batteries are highly sought after for their high energy density, long cycle life, and environmentally friendly properties. However, to meet increasingly stringent application requirements, lithium battery technology still needs to be continuously improved in terms of safety and energy density.

[0003] Traditional square aluminum-cased lithium batteries typically use flat adapters to connect the tabs and terminals of the lithium battery. Although this connection method seems simple, it has many shortcomings in actual application. First, in order to achieve welding, the tabs need to be longer, which not only increases material costs but also complicates the welding process. Secondly, the tabs need to be folded in a "Z" shape after welding to facilitate fixation between the battery cover and the battery electrode group. However, this folding method requires a large gap between the battery cover and the battery electrode group to accommodate the folded tabs. However, after the battery electrode group is inserted into the shell, the folded tabs will occupy a portion of the internal space of the battery shell, which directly leads to a decrease in the effective energy density of the battery. In addition, the folded tabs may form an inverted insertion phenomenon and be inserted into the core pack, increasing the risk of short circuits and seriously threatening the safety of the battery. Utility Model Content

[0004] In view of this, the present invention proposes a battery adapter, a battery tab adapter structure and a lithium battery to solve the problem in the prior art that the tab and the flat-plate adapter are folded in a Z shape after welding, resulting in reduced utilization of the internal space of the shell.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] In a first aspect, the present invention provides a battery adapter, comprising:

[0007] A first sheet having a first surface and a second surface opposite to each other, wherein the first surface is used for electrically connecting to the cover plate;

[0008] The second sheet is fixedly arranged vertically on the second surface, and the two side surfaces of the second sheet are respectively used for welding with the tabs on the core package.

[0009] On the basis of the above technical solution, preferably, the first surface is provided with a pole welding portion for welding to the pole on the cover plate.

[0010] As an embodiment, the pole welding portion is located at the center of the first surface, and the second sheet is located at the center of the second surface.

[0011] As another embodiment, the pole welding portion is located at one end of the first sheet, the second sheet is located at an end of the second sheet away from the pole welding portion, and the second sheet is located on the central axis of the first sheet.

[0012] Based on the above technical solution, preferably, the first sheet includes a first part and a second part connected to each other, the pole welding part is located in the first part, the second sheet is located in the second part, and the width of the second part is less than or equal to the first part.

[0013] Preferably, the second portion is in a rectangular structure or a triangular structure.

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

[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 first sheet is horizontally arranged on the bottom surface of the lower plastic part, the pole welding part on the first sheet is welded to the pole, and the second sheet is parallel to the central axis of the lower plastic part in the length direction.

[0016] Furthermore, preferably, both ends of the lower plastic part in the length direction are respectively provided with limiting portions, and the height of the second sheet is less than or equal to the height of the limiting portions.

[0017] In a third aspect, the utility model 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.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) Compared with the traditional flat adapter plus tab butterfly welding process, the battery adapter of the present invention has a three-dimensional structure. Since the tab is welded in parallel with the second sheet, after the battery adapter is welded to the tab on the core package, the two core packages are in a parallel and close state. During the process of the core package entering the shell, there is no need to flip the core package or fold the tab, which effectively avoids the problem of tab stress concentration and fracture during the folding process. The parallel welding design reduces the length of the tab and avoids the tab occupying the internal space of the battery when folding, thereby minimizing the space waste caused by the tab folding and improving the energy density of the battery.

[0020] (2) The tab is welded in parallel to the second sheet, and the tab does not need to be folded, which avoids the risk of the tab folding and inserting into the core package, thereby improving the safety and reliability of the battery.

[0021] (3) The pole welding part is located at the center of the first surface, and the second plate is located at the center of the second surface. This structural setting, on the one hand, can ensure that the adapter plate is evenly stressed when subjected to current and mechanical force, reduce local stress concentration, and improve the stability and durability of the entire battery structure. On the other hand, the pole welding part is located in the center, and the current transmission path is shorter and straighter, which reduces resistance and energy loss and improves the battery's current capacity.

[0022] (4) The pole welding portion is located at one end of the first sheet, and the second sheet is located at the end of the second sheet away from the pole welding portion, and the second sheet is located on the central axis of the first sheet. This structural arrangement causes the second sheet and the pole welding portion to be staggered in the horizontal direction, so that during the welding process of the pole welding portion with the pole, the end of the first sheet away from the second sheet is not blocked, which facilitates the laser welding operation. In addition, the pole welding portion and the second sheet are respectively located at the two ends of the first sheet. This design can reduce heat concentration during welding, reduce welding stress, and improve welding reliability and contact quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the first embodiment of the battery connecting piece disclosed in the present utility model;

[0025] Figure 2 This is a schematic diagram of the first assembly structure of the battery adapter and the cover plate disclosed in the utility model;

[0026] Figure 3 This is a schematic diagram of the three-dimensional structure of the second embodiment of the battery connecting piece disclosed in the present utility model;

[0027] Figure 4 This is a schematic diagram of the second assembly structure of the battery adapter and the cover plate disclosed in the present utility model;

[0028] Figure 5 This is a schematic diagram of the three-dimensional structure of the battery tab adapter structure disclosed in the present utility model;

[0029] Figure 6This is a schematic diagram of the planar structure of the lithium battery disclosed in the present utility model;

[0030] Figure 7 for Figure 6 Plane section view at AA in the middle;

[0031] Figure 8 for Figure 6 Plane section view at the middle BB;

[0032] Reference numerals:

[0033] 1. Battery adapter; 11. First sheet; 12. Second sheet; 111. First surface; 112. Second surface; 110. Post welding part; 11a. First part; 11b. Second part; 2. Cover; 3. Core package; 31. Tab; 21. Plain aluminum plate; 22. Lower plastic part; 23. Post; 221. Limiting part; 4. Shell. DETAILED DESCRIPTION

[0034] 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.

[0035] Example 1

[0036] like Figure 1 As shown, combined Figure 2-5 The embodiment of the present utility model discloses a battery adapter 1, which includes a first sheet 11 and a second sheet 12.

[0037] The first sheet 11 is flat and has a first surface 111 and a second surface 112 that are oppositely disposed. The first surface 111 is used to electrically connect to the cover plate 2. Specifically, the first sheet 11 is electrically connected to the pole 23 on the cover plate 2 via the first surface 111. The second sheet 12 is fixedly disposed perpendicularly to the second surface 112. The two side surfaces of the second sheet 12 are respectively used to weld to the tabs 31 on the core package 3. This structural arrangement allows the core package 3 to be disposed parallel to the second sheet 12, and the tabs 31 on the core package 3 can be directly welded parallel to the side surfaces of the second sheet 12 without bending.

[0038] Compared with the traditional flat adapter plus tab 31 butterfly welding process, the battery adapter 1 of this embodiment has a three-dimensional structure. Since the tab 31 is welded in parallel with the second sheet 12, after the battery adapter 1 and the tab 31 on the core package 3 are welded, the two core packages 3 are in a parallel and close state. During the process of the core package 3 being put into the shell, there is no need to flip the core package 3 or fold the tab 31, which effectively avoids the stress concentration and fracture problems of the tab 31 during the folding process. The parallel welding design reduces the length of the tab 31, avoids the occupation of the internal space of the battery by the tab 31 when folding, minimizes the space waste caused by the folding of the tab 31, and improves the energy density of the battery.

[0039] At the same time, the tab is welded in parallel with the second sheet, and the tab does not need to be folded, avoiding the risk of the tab folding and inserting into the core package, thereby improving the safety and reliability of the battery.

[0040] In this embodiment, the first surface 111 is provided with a pole welding portion 110 for welding to the pole 23 on the cover plate 2. The pole welding portion 110 is provided with a recessed groove structure, so that the pole 23 is embedded in the recessed groove. At this time, the first surface 111 and the bottom surface of the cover plate 2 are in contact, and the pole welding portion 110 and the pole 23 can be welded by laser penetration welding on the second surface 112.

[0041] As an embodiment, refer to the attached Figure 1 and 2 As shown, the pole welding portion 110 is located at the center of the first surface 111, and the second plate 12 is located at the center of the second surface 112. This structural arrangement, on the one hand, ensures that the adapter plate is evenly stressed when subjected to current and mechanical forces, reduces local stress concentration, and improves the stability and durability of the entire battery structure. On the other hand, the pole welding portion 110 is located in the center, making the current transmission path shorter and straighter, reducing resistance and energy loss, and improving the battery's current capacity.

[0042] As another embodiment, refer to the attached Figure 3 and 4 As shown, the pole welding portion 110 is located at one end of the first sheet 11, and the second sheet 12 is located at the end of the second sheet 12 away from the pole welding portion 110, and the second sheet 12 is located on the central axis of the first sheet 11. This structural arrangement causes the second sheet 12 and the pole welding portion 110 to be staggered in the horizontal direction, so that during the welding process of the pole welding portion 110 with the pole 23, the end of the first sheet 11 away from the second sheet 12 is not blocked, facilitating the laser welding operation. In addition, the pole welding portion 110 and the second sheet 12 are respectively located at the two ends of the first sheet 11. This design can reduce heat concentration during welding, reduce welding stress, and improve welding reliability and contact quality.

[0043] In this embodiment, after the current passes through the second sheet 12, it is transferred from the second sheet 12 to one end of the first sheet 11, and then transferred from one end of the first sheet 11 to the other end. In this case, the current needs to pass through the longer first sheet 11, and there is a larger internal resistance.

[0044] To this end, the solution adopted in this embodiment is as follows: the first sheet 11 includes a first part 11a and a second part 11b that are interconnected, the pole welding portion 110 is located in the first part 11a, the second sheet 12 is located in the second part 11b, and the width of the second part 11b is less than or equal to the width of the first part 11a. Since the width of the second part 11b is narrower, when the current passes through this part, the area it needs to flow through is smaller, and the current density is higher, thereby reducing the internal resistance. This is because the internal resistance is proportional to the length of the conductor and inversely proportional to the cross-sectional area. The narrower width of the second part 11b reduces the path area of ​​the current in this part, reducing the internal resistance. By reducing the internal resistance, the battery can transmit energy with higher efficiency.

[0045] Preferably, the second portion 11b is in a rectangular structure or a triangular structure.

[0046] Example 2

[0047] The present utility model also discloses a battery tab 31 transfer structure, referring to the attached Figure 5 As shown, it includes a cover plate 2, two core packs 3 and the battery adapter 1 disclosed in the above embodiment. The first sheet 11 is electrically connected to the cover plate 2, and the tabs 31 of the same polarity on the two core packs 3 are respectively welded to the two side surfaces of the second sheet 12.

[0048] Since the battery adapter adopts a three-dimensional structure rather than a traditional planar structure, the pole ear 31 on the core package 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 side of the second sheet 121. The pole ears 31 on the two core packages 3 are welded to the second sheet 12 respectively. After the welding is completed, the two core packages 3 are parallel to each other. During the process of the core package 3 being put into the shell, there is no need to flip the core package 3 or fold the pole ear 31. This effectively avoids the stress concentration and fracture problems of the pole ear 31 during the folding 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 folded, minimizes the space waste caused by the folding of the pole ear 31, and improves the energy density of the battery.

[0049] The cover plate 2 disclosed in this embodiment includes a plain aluminum plate 21 and a lower plastic part 22 fixedly mounted on the bottom surface of the plain aluminum plate 21. A pole 23 is provided on the cover plate 2. The first sheet 11 is horizontally mounted on the bottom surface of the lower plastic part 22. The pole welding portion 110 on the first sheet 11 is welded to the pole 23. The second sheet 12 is parallel to the longitudinal center axis of the lower plastic part 22. As a result, when the two core packs 3 are closed, the tabs 31 on the core pack 3 can be parallel to the second sheet 12, facilitating welding.

[0050] In the above embodiment, the pole 23 is insulated and fixedly connected to the cover plate 2, 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 pack 3 and the bare aluminum plate 21. The pole 23 can be fixed to the bare 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.

[0051] In some preferred embodiments, a limiting portion 221 is provided at each end of the lower plastic part 22 in the longitudinal direction, and the height of the second sheet 12 is less than or equal to the height of the limiting portion 221. Thus, the limiting portion 221 can be used to positionally limit the end of the core package 3, preventing the second sheet 12 from being inserted into the core package 3 and causing a short circuit during the connection between the core package 3 and the cover plate 2. The limiting portion 221 can also positionally limit the end of the core package 3, confining the welding structure between the tab 31 and the battery adapter 1 between the core package 3 and the cover plate 2.

[0052] Based on the same inventive concept, the present invention also discloses a lithium battery. Figure 6-8 As shown, it includes a housing 4 and the battery tab 31 adapter structure disclosed in the above embodiment. The core pack 3 is arranged in the housing 4, and the cover plate 2 is fixedly connected to the open end of the housing 4. By using the above battery tab 31 adapter structure, the energy density of the lithium battery can be improved.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, 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) having a first surface (111) and a second surface (112) arranged opposite to each other, wherein the first surface (111) is used for electrically connecting to the cover plate (2); The second sheet (12) is fixedly arranged vertically on the second surface (112), and the two side surfaces of the second sheet (12) are respectively used for welding with the tabs (31) on the core package (3).

2. The battery adapter according to claim 1, wherein: The first surface (111) is provided with a pole welding portion (110) for welding to the pole (23) on the cover plate (2).

3. The battery adapter according to claim 2, wherein: The pole welding portion (110) is located at the center of the first surface (111), and the second sheet (12) is located at the center of the second surface (112).

4. The battery adapter according to claim 2, wherein: The pole welding portion (110) is located at one end of the first sheet (11), the second sheet (12) is located at one end of the second sheet (12) away from the pole welding portion (110), and the second sheet (12) is located on the central axis of the first sheet (11).

5. The battery adapter according to claim 4, wherein: The first sheet (11) comprises a first part (11a) and a second part (11b) connected to each other, the pole (23) welding portion (110) is located in the first part (11a), the second sheet (12) is located in the second part (11b), and the width of the second part (11b) is less than or equal to that of the first part (11a).

6. The battery adapter according to claim 5, wherein: The second portion (11b) is in a rectangular structure or a triangular structure.

7. A battery tab adapter structure, characterized in that: The battery adapter comprises a cover plate (2), two core packs (3) and the battery adapter according to any one of claims 2 to 6, wherein the first sheet (11) and the cover plate (2) are electrically connected, and the tabs (31) of the same polarity on the two core packs (3) are respectively welded to the two side surfaces of the second sheet (12).

8. The battery tab adapter structure according to claim 7, 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 first sheet (11) is horizontally arranged on the bottom surface of the lower plastic part (22); a pole (23) welding portion (110) on the first sheet (11) is welded to the pole (23); and the second sheet (12) is parallel to the longitudinal center axis of the lower plastic part (22).

9. The battery tab adapter structure according to claim 8, 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 second sheet (12) 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 7 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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