High-capacity battery cell structure

Abstract

The utility model provides a high-capacity battery cell structure and belongs to the field of new energy batteries. The structure comprises a top cover, connecting pieces, a battery cell and a shell, the shell wraps the battery cell and the connecting pieces, a positive terminal and a negative terminal are arranged on the top cover at intervals, the two connecting pieces are connected with the positive terminal and the negative terminal respectively, the battery cell is arranged between the two connecting pieces, the battery cell comprises a plurality of roll cores, and the roll cores are connected with the shell. The plurality of roll cores are stacked in the direction perpendicular to the top cover, tabs are arranged at the two ends of the roll cores in the length direction, and a plurality of tab through holes matched with the tabs are formed in the connecting sheet and are arranged at intervals in the length direction of the connecting sheet. By adopting the high-capacity battery cell structure provided by the embodiment of the utility model, the problems in the prior art that a tab welding structure is relatively complicated, and the overall capacity of the battery cell is low due to the limited number of roll cells can be solved.

Description

Technical Field

[0001] The utility model relates to the field of new energy batteries, and in particular to a large-capacity battery core structure. Background Art

[0002] With the vigorous development of the new energy industry, improving the energy density of battery cells and reducing their costs are areas of high attention.

[0003] In order to improve the energy density of battery cells, the existing cell structure usually adopts a stacked structure, that is, multiple cores are stacked in a direction perpendicular to the top cover. However, due to the increase in the number of cores, the structure of the current connection between each core tab and the pole is more complicated. The farther the core is from the top cover, the farther the tab welding trajectory is. It is necessary to increase the tab length to connect the core farther from the top cover. However, there is an upper limit to the tab length and it greatly increases the cost, resulting in a limited number of cores.

[0004] The existing battery cell structure in the related art has a relatively complex tab welding structure, and the overall capacity of the battery cell is low due to the limited number of winding cores. Utility Model Content

[0005] The embodiment of the utility model provides a large-capacity battery cell structure, which can solve the problem in the prior art that the tab welding structure is relatively complicated and the overall capacity of the battery cell is low due to the limited number of winding cores. The technical solution is as follows:

[0006] A large-capacity battery cell structure, comprising: a top cover, a connecting piece, a battery cell and a shell,

[0007] The shell is wrapped around the outside of the battery core and the connecting piece, the top cover is provided with a positive terminal and a negative terminal at intervals, two connecting pieces are provided and are respectively connected to the positive terminal and the negative terminal, the battery core is arranged between the two connecting pieces, the battery core includes a plurality of winding cores, the plurality of winding cores are stacked in a direction perpendicular to the top cover, pole ears are provided at both ends of the winding core along the length direction, a pole ear through hole matching the pole ear is opened on the connecting piece, a plurality of pole ear through holes are provided, and are arranged at intervals along the length direction of the connecting piece.

[0008] Optionally, in the length direction of the connecting sheet, the tab through hole has two opposite welding sides, and the two welding sides are parallel.

[0009] Optionally, at least two of the plurality of tab through holes have different sizes.

[0010] Optionally, the size of the tab through-hole is adjustable.

[0011] Optionally, the connecting plate includes a pole lug welding portion and two slide rails arranged along the length direction, a plurality of pole lug welding portions are provided, the pole lug welding portion is slidably arranged between the two slide rails, and two adjacent pole lug welding portions are spaced apart to define the pole lug through hole.

[0012] Optionally, the tab welding portion is connected to the slide rail via screws.

[0013] Optionally, insulating plates are provided on both sides of the connecting piece.

[0014] The beneficial effects brought by the technical solution provided by the embodiment of the utility model include at least:

[0015] A large-capacity battery cell structure provided by an embodiment of the utility model has a pole lug through hole on the connecting sheet so that the pole lug on the winding core can be welded in cooperation with the pole lug through hole, and the pole lug through hole can be extended in the length direction of the connecting sheet, so that more winding cores can be stacked without increasing the length of a single pole lug, which can effectively solve the problem of complex pole lug welding structure in the prior art and low overall capacity of the battery cell due to the limited number of winding cores. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments 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 creative work.

[0017] Figure 1 This is a schematic diagram of a top cover and a connecting piece structure provided by an embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the assembly of a top cover, a connecting piece and a battery cell provided by an embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the battery cell structure provided by an embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the overall assembly provided by an embodiment of the utility model.

[0021] In the figure: 1-top cover; 11-positive terminal; 12-negative terminal; 2-connecting plate; 21-ear through hole; 211-welding side; 22-ear welding part; 23-slide rail; 3-battery cell; 31-winding core; 32-ear; 4-insulating sheet; 5-housing. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of a top cover and a connecting piece structure provided by an embodiment of the utility model; Figure 2 This is a schematic diagram of the assembly of a top cover, a connecting piece and a battery cell provided by an embodiment of the utility model; Figure 3 This is a schematic diagram of the battery cell structure provided by an embodiment of the utility model; Figure 4 This is a schematic diagram of the overall assembly provided by the embodiment of the utility model. Figures 1 to 4 A large-capacity battery cell structure shown includes: a top cover 1, a connecting sheet 2, a battery cell 3 and a shell 5, the shell 5 is wrapped around the outside of the battery cell 3 and the connecting sheet 2, a positive terminal 11 and a negative terminal 12 are arranged on the top cover 1 at intervals, two connecting sheets 2 are provided and are respectively connected to the positive terminal 11 and the negative terminal 12, the battery cell 3 is arranged between the two connecting sheets 2, the battery cell 3 includes a plurality of winding cores 31, the plurality of winding cores 31 are stacked in a direction perpendicular to the top cover 1, pole ears 32 are arranged at both ends of the winding core 31 along the length direction, a pole ear through hole 21 matching the pole ear 32 is opened on the connecting sheet 2, a plurality of pole ear through holes 21 are provided, and they are arranged at intervals along the length direction of the connecting sheet 2.

[0024] For example, in the embodiment of the present utility model, Figure 1 As shown, the connecting piece 2 is formed by integral casting, and the area between the two tab through holes 21 constitutes the tab welding portion 22. A plurality of winding cores 31 are stacked on a work surface to form a battery cell 3. A top cover 1 is arranged on the top of the battery cell 3 so that the large surface of the winding core 31 and the top cover 1 are stacked in parallel. At this time, the two connecting pieces 2 are located at both ends of the length direction of the battery cell 3, and the positive terminal 11 and the negative terminal 12 are respectively connected to the connecting pieces 2 at both ends to connect with the outside. Both ends of each winding core 31 are provided with pole ears 32. After the pole ears 32 penetrate the pole ear through-hole 21, the pole ears 32 are folded, and the folded pole ears 32 are fitted with the pole ear welding part 22. Then the pole ears 32 and the pole ear welding part 22 are welded and fixed, so that multiple pole ears 32 are welded and fixed on the connecting sheet 2. When the capacity of the battery cell 3 needs to be increased, more winding cores 31 can be stacked, so that corresponding pole ear through-holes 21 and pole ear welding parts 22 are provided on the connecting sheet 2. Each pole ear 32 only needs a fixed length to be welded with the connecting sheet 2, so that when more winding cores 31 are added, the length of a single pole ear 32 will not be increased, and the manufacturing cost is reduced while the capacity of the battery cell 3 is increased. Figure 4 As shown, a shell 5 is provided outside the battery core 3 and the connecting piece 2 to protect the welding structure of the battery core 3 and the connecting piece 2 and reduce the destructive force of the matching welding caused by external impact.

[0025] A large-capacity battery cell structure provided by an embodiment of the utility model has a pole lug through hole 21 on the connecting sheet 2, so that the pole lug 32 on the winding core 31 can be welded with the pole lug through hole 21, and the pole lug through hole 21 can be extended in the length direction of the connecting sheet 2, so that more winding cores 31 can be stacked without increasing the length of a single pole lug 32, which can effectively solve the problem of complex pole lug welding structure in the prior art and low overall capacity of the battery cell due to the limited number of winding cores.

[0026] Optionally, in the length direction of the connecting sheet 2 , the tab through hole 21 has two opposite welding sides 211 , and the two welding sides 211 are parallel.

[0027] Illustratively, in an embodiment of the utility model, when welding the pole lug 32, the pole lug 32 needs to penetrate the pole lug through hole 21 and then be folded, and then be welded with the pole lug welding portion 22. When the pole lug through hole 21 has two opposite welding side edges 211, and the two welding side edges 211 are parallel, after the pole lug 32 penetrates the pole lug through hole 21 and is folded, it can be fully fitted with the pole lug welding portion 22, thereby increasing the fitting surface between the pole lug 32 and the pole lug welding portion 22, and reducing the possibility of breakpoints in the welding cooperation between the pole lug 32 and the pole lug welding portion 22, thereby improving the stability of the large-capacity battery cell structure.

[0028] Optionally, at least two of the plurality of tab through-holes 21 have different sizes.

[0029] Illustratively, in an embodiment of the utility model, the pole lug through hole 21 matches the pole lug 32. When the thicknesses of the stacked winding cores 31 are different, by providing pole lug through holes 21 of different sizes, the pole lugs 32 provided on the winding cores 31 of different thicknesses can be conveniently passed through the pole lug through holes 21 and matched with the pole lug welding portion 22, thereby improving the compatibility performance of the large-capacity battery cell structure.

[0030] Optionally, the size of the tab through hole 21 is adjustable.

[0031] Illustratively, in an embodiment of the utility model, the size of the tab through hole 21 is adjustable, so that the connecting piece 2 can adjust the size of the tab through hole 21 at any time according to the winding core 31 of different thicknesses, so as to facilitate the welding of the tab 32 through the tab through hole 21, thereby making the same connecting piece 2 compatible with winding cores 31 of various specifications, further improving the compatibility performance of the present large-capacity battery cell structure.

[0032] Optionally, the connecting piece 2 includes a pole lug welding portion 22 and two slide rails 23 arranged along the length direction. There are multiple pole lug welding portions 22, and the pole lug welding portions 22 are slidably arranged between the two slide rails 23. Two adjacent pole lug welding portions 22 are arranged at intervals to define a pole lug through hole 21.

[0033] For example, in the embodiment of the present utility model, Figure 2 As shown, the tab welding part 22 is slidably arranged on the slide rail 23, and there is a tab through hole 21 between two adjacent tab welding parts 22. The size and position of the tab through hole 21 can be adjusted by sliding the tab welding part 22 on the slide rail 23, so that the tab through hole 21 is adapted to the position of the tab 32 on the winding core 31 of different thicknesses, so that each winding core 31 can adopt a different thickness. This structure is simple, easy to operate, and further improves the compatibility of the large-capacity battery structure.

[0034] Optionally, the tab welding portion 22 is connected to the slide rail 23 by screws.

[0035] For example, in an embodiment of the utility model, after adjusting the pole lug welding portion 22 to a suitable position, the pole lug welding portion 22 is set on the slide rail 23 by screws, so that the pole lug welding portion 22 can be fixed, thereby reducing the problem of unstable welding caused by the influence of gravity during the welding process between the pole lug 32 and the pole lug welding portion 22, thereby facilitating the operator to perform welding and improving the operational convenience of the present large-capacity battery cell structure.

[0036] Optionally, insulating plates 4 are provided on both sides of the connecting piece 2 .

[0037] For example, in the embodiment of the utility model, by providing insulating plates 4 on both sides of the connecting sheet 2, it is possible to prevent the tabs 32 from accidentally touching each other and causing a short circuit, thereby further improving the stability of the large-capacity battery cell structure.

[0038] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] The above description is only an optional 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 shall be included in the protection scope of the present invention.

Claims

1. A large-capacity battery cell structure, characterized in that: include: A top cover (1), a connecting piece (2), a battery cell (3) and a housing (5), The outer shell (5) is wrapped around the outside of the battery cell (3) and the connecting piece (2); a positive terminal (11) and a negative terminal (12) are arranged at intervals on the top cover (1); two connecting pieces (2) are provided and are respectively connected to the positive terminal (11) and the negative terminal (12); the battery cell (3) is arranged between the two connecting pieces (2); the battery cell (3) comprises a plurality of winding cores (31); the plurality of winding cores (31) are stacked in a direction perpendicular to the top cover (1); pole ears (32) are arranged at both ends of the winding core (31) in the length direction; a pole ear through hole (21) matching the pole ear (32) is opened on the connecting piece (2); a plurality of pole ear through holes (21) are provided and are arranged at intervals in the length direction of the connecting piece (2).

2. A large-capacity battery cell structure according to claim 1, characterized in that: In the length direction of the connecting sheet (2), the tab through hole (21) has two opposite welding sides (211), and the two welding sides (211) are parallel.

3. A large-capacity battery core structure according to claim 1, characterized in that: At least two of the plurality of tab through holes (21) have different sizes.

4. A large-capacity battery cell structure according to claim 3, characterized in that: The size of the tab through hole (21) is adjustable.

5. A large-capacity battery cell structure according to claim 4, characterized in that: The connecting piece (2) comprises a pole lug welding portion (22) and two slide rails (23) arranged along the length direction, a plurality of the pole lug welding portions (22) are provided, the pole lug welding portion (22) is slidably arranged between the two slide rails (23), and two adjacent pole lug welding portions (22) are arranged at intervals to define the pole lug through hole (21).

6. A large-capacity battery cell structure according to claim 5, characterized in that: The pole tab welding portion (22) is connected to the slide rail (23) via screws.

7. A large-capacity battery cell structure according to claim 1, characterized in that: Insulating plates (4) are provided on both sides of the connecting piece (2).

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