End plate structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses an end plate structure and a battery, the end plate structure comprises an end plate body and a side plate, the end plate body is provided with an insertion space, and a tab of a pole group is suitable for being inserted in the insertion space; an opening is formed in one side of the end plate body, the opening is located in the periphery of the insertion space and communicates with the insertion space, and the tab is suitable for entering the insertion space through the opening; according to the end plate structure provided by the utility model, the tab can conveniently enter the insertion space through the opening, the difficulty that the tab penetrates through the end plate structure is effectively reduced, the side plate is not easy to deform, the poor assembly between the tab and the end plate structure is avoided, and the reliability of the end plate structure is improved. And the assembly yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an end plate structure and a battery. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, which increases the performance and safety requirements of lithium-ion batteries.

[0003] Blade batteries, as a type of lithium-ion battery, have seen their process and structure simplified as a major development trend. In blade batteries of related technologies, blade cells are usually comprised of blade cells, end plates and cover plates. The ends of blade cells are provided with tabs. After the tabs are inserted into the end plates, the cover plates are inserted into the shell and press the end plates tightly, thereby achieving the function of fixing the tabs and accommodating the tabs to ensure internal insulation. At the same time, the bare cell insulation sheet is hot-melted around the end plates to prevent the tabs from contacting the shell.

[0004] However, since the area through which the pole ear passes on the end plate needs to be adapted to the pole ear, the thickness of one side of the end plate is thinner and easily deformed inward, resulting in a narrow area through which the pole ear passes; and the pole ear itself is thinner and wider, and is also prone to deformation. Any of the above-mentioned deformations or the superposition of two deformations can easily make it difficult for the pole ear to pass through the end plate, resulting in poor assembly. Utility Model Content

[0005] In view of this, the utility model provides an end plate structure and a battery to solve the problem that the end plate and / or the tab are deformed, making it difficult for the tab to pass through the end plate.

[0006] In the first aspect, the utility model provides an end plate structure, comprising an end plate body and a side plate, wherein the end plate body is provided with an interpenetration space, and the pole lugs of the pole group are suitable for being inserted into the interpenetration space; an opening is provided on one side of the end plate body, and the opening is located on the side of the interpenetration space and is connected with the interpenetration space to form a groove-shaped space, and the pole lugs are suitable for entering the interpenetration space through the opening; the side plate is detachably connected to the opening, and cooperates with the end plate body to form an annular interpenetration space.

[0007] Beneficial effects: an opening is provided on the end plate body, and a side plate is detachably connected to the opening. After the side plate is connected to the opening, the annular interlacing space is in a closed state, and the pole ear can be accommodated and fixed. After the side plate is removed from the opening, the annular interlacing space is in an open state to form a groove-shaped space, and the pole ear can easily enter the interlacing space through the opening, which effectively reduces the difficulty of the pole ear passing through the end plate structure, avoids poor assembly between the pole ear and the end plate structure, and improves the assembly yield.

[0008] In an optional embodiment, the end panel body and the side panel are detachably plugged in.

[0009] Beneficial effects: the end plate body and the side plate are detachably plugged in, the connection steps are few, and the connection is relatively easy and quick.

[0010] In an optional embodiment, a plug-in hole is provided on the end plate body, and a plug-in boss is provided on the side plate, and the plug-in boss is detachably plugged into the plug-in hole.

[0011] Beneficial effects: The cooperation between the plug-in hole and the plug-in boss simplifies the structure, simplifies the connection steps and methods, and saves connection time.

[0012] In an optional embodiment, the plug-in boss matches the shape of the plug-in hole, and the outer peripheral wall of the plug-in boss is interference fit with the groove wall of the plug-in hole.

[0013] Beneficial effect: The peripheral wall of the plug-in boss and the groove wall of the plug-in hole are interference-fitted, so that the connection between the plugged-in side plate and the end plate body is more stable and not easy to separate, thereby ensuring the stability of the entire end plate structure.

[0014] In an optional implementation, the plug-in hole is a bar-shaped hole.

[0015] Beneficial effects: the plug-in hole is a strip-shaped hole, and the plug-in protrusion is a strip-shaped column with matching shape, which has a simple structure and high matching strength.

[0016] In an optional implementation, the interference H between the plug-in hole and the plug-in boss satisfies 0.05≤H≤0.1.

[0017] Beneficial effect: The interference between the plug-in hole and the plug-in boss can not only ensure that the plug-in between the plug-in hole and the plug-in boss is stable and not easy to separate, but also facilitate plug-in and disassembly.

[0018] In an optional implementation, the plug hole is a blind hole.

[0019] Beneficial effect: The plug-in hole is a blind hole, and the opening of the plug-in hole faces the end plate body, which can keep the end surface of the side plate facing away from the end plate body relatively complete and beautiful in appearance, facilitate hot melting of the bare battery cell insulating sheet, and better separate the tab from the battery shell.

[0020] In an optional embodiment, the end face of the end plate body facing the pole group is the first end face, the end face of the pole group provided with the pole ear is the second end face, and the first end face is slidably matched with the second end face.

[0021] Beneficial effect: The sliding fit between the first end face and the second end face can smoothly deliver the tab through the opening into the insertion space, preventing the tab from being damaged by accidents such as flipping or tilting during the tab's entry into the insertion space.

[0022] In an optional embodiment, two limiting grooves are provided on the end plate body, and the two limiting grooves are respectively arranged at the two ends of the opening along the circumference of the annular interpenetration space, and the two ends of the side plate are respectively arranged in the two limiting grooves, and the plug-in boss is arranged on the bottom of the limiting groove.

[0023] Beneficial effects: the limiting groove can limit and guide the movement of the side panel, simplifying the assembly of the side panel; and the limiting groove can accommodate the side panel, which can enhance the stability of the side panel after the side panel is assembled.

[0024] In an optional embodiment, the end surface of the side plate facing away from the plug-in boss and the outer surface of the end plate body provided with the limiting groove are located in the same plane.

[0025] Beneficial effect: The end surface of the side plate facing away from the plug-in protrusion is flush with the outer peripheral surface of the end plate body, so that the outer periphery of the end plate structure as a whole maintains a relatively complete and beautiful appearance, which facilitates hot melting of the bare battery cell insulating sheet.

[0026] In a second aspect, the utility model further provides a battery, comprising a pole group and the above-mentioned end plate structure, wherein the ends of the pole group are provided with pole ears; the pole ears are penetrated in the interpenetration space and enter the interpenetration space through the opening.

[0027] Beneficial effect: The tabs can easily enter the interpenetrating space through the openings, which effectively reduces the difficulty of the tabs passing through the end plate structure, avoids poor assembly between the tabs and the end plate structure, and improves the assembly yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is an installation explosion view of an end plate structure of an embodiment of the utility model from a first perspective;

[0030] Figure 2 for Figure 1 A is a partial enlarged schematic diagram;

[0031] Figure 3It is an installation explosion view of an end plate structure of an embodiment of the utility model from a second perspective;

[0032] Figure 4 for Figure 3 A partial enlarged schematic diagram of B in the middle;

[0033] Figure 5 This is a partial installation explosion view of a battery according to an embodiment of the utility model;

[0034] Figure 6 for Figure 5 A partial enlarged schematic diagram of C in the middle;

[0035] Figure 7 A partial schematic diagram of an electrode group of a battery according to an embodiment of the utility model;

[0036] Figure 8 It is a schematic diagram of the end plate structure in the related art;

[0037] Fig. 9 It is an exploded partial view of the installation of the end plate structure and the pole group in the related art;

[0038] Fig.10 It is a partial view of the end plate structure and the pole group after installation in the related art.

[0039] Description of reference numerals:

[0040] 1. End plate body; 11. Insertion space; 12. Opening; 13. Insertion boss; 14. Position limiting groove; 2. Side plate; 21. Insertion hole; 3. Pole group; 31. Pole ear; 32. Second end face;

[0041] 4. Positive terminal plate; 41. Interlaced area; 5. Positive pole ear. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0043] Blade batteries, as a type of lithium-ion battery, have seen their process and structure simplified as a major development trend. The blade batteries of related art generally include blade cells, a positive terminal plate 4, a negative terminal plate, a negative electrode cover plate, and a positive electrode cover plate. Figures 7 to 10As shown, a positive electrode tab 5 and a negative electrode tab are respectively provided at both ends of the blade cell. The blade cell is formed by stacking a plurality of cell bodies in sequence. A positive electrode tab and a negative electrode tab are respectively provided at both ends of each cell body. A plurality of positive electrode tabs are welded into a thinner positive electrode tab 5, and a plurality of negative electrode tabs are welded into a thinner negative electrode tab 31. Figures 8 to 9 As shown, the connection of the positive electrode ear 5 is taken as an example for explanation. After the positive electrode ear 5 is inserted into the insertion area 41 on the positive terminal plate 4, the positive electrode cover plate is inserted into the shell and presses the positive terminal plate 4, thereby achieving the function of fixing the positive electrode ear 5, and also accommodating the positive electrode ear 5 to ensure internal insulation; at the same time, the bare battery cell insulating sheet is hot-melted to the four sides of the positive terminal plate 4 to avoid contact between the positive electrode ear 5 and the shell.

[0044] However, since the insertion area 41 on the positive terminal plate 4 for the positive electrode tab 5 to pass through must be adapted to the positive electrode tab 5, the thickness of one side of the positive terminal plate 4 is relatively thin and easily deformed inward, resulting in a narrow insertion area 41 through which the positive electrode tab 5 can pass; and the positive electrode tab 5 itself is relatively thin and wide, and is also prone to deformation. Any one of the above-mentioned deformations or the superposition of two deformations can easily make it difficult for the positive electrode tab 5 to pass through the positive terminal plate 4, resulting in poor assembly.

[0045] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0046] According to an embodiment of the utility model, on the one hand, an end plate structure is provided, including an end plate body 1 and a side plate 2, wherein an interpenetration space 11 is provided on the end plate body 1, and the pole ear 31 of the pole group 3 is suitable for being inserted into the interpenetration space 11; an opening 12 is provided on one side of the end plate body 1, and the opening 12 is located on the side of the interpenetration space 11, and is connected with the interpenetration space 11 to form a groove-shaped space, and the pole ear 31 is suitable for entering the interpenetration space 11 through the opening 12; the side plate 2 is detachably connected to the opening 12, and cooperates with the end plate body 1 to form an annular interpenetration space 11.

[0047] The end plate body 1 is provided with an opening 12, and the side plate 2 is detachably connected to the opening 12. After the side plate 2 is connected to the opening 12, the annular interpenetrating space 11 is in a closed state, and the pole lug 31 can be accommodated and fixed; after the side plate 2 is removed from the opening 12, the annular interpenetrating space 11 is in an open state, and the interpenetrating space 11 forms a groove-shaped space, and the pole lug 31 is easy to enter the interpenetrating space 11 through the opening 12, which effectively reduces the difficulty of the pole lug 31 passing through the end plate structure, and the side plate 2 is not easy to deform, avoiding poor assembly between the pole lug 31 and the end plate structure, and improving the assembly yield.

[0048] In a specific implementation, the end plate structure may be disposed at the positive electrode of the electrode group 3 or at the negative electrode of the electrode group 3. In this embodiment, it is preferably disposed at the positive electrode of the electrode group 3.

[0049] In one embodiment, the end plate body 1 and the side plate 2 are detachably plugged in.

[0050] The end plate body 1 and the side plate 2 are detachably plugged in, the connection steps are few, and the connection is relatively easy and quick.

[0051] As a convertible embodiment, the end plate body 1 and the side plate 2 may be detachably connected; or, one end of the opening 12 of the end plate body 1 may be hinged to one end of the side plate 2, and the other end of the opening 12 of the end plate body 1 may be connected to the other end of the side plate 2; or, the end plate body 1 and the side plate 2 may be threadedly connected by fasteners such as screws or bolts.

[0052] In one embodiment, a plug-in hole 21 is provided on the end plate body 1 , and a plug-in boss 13 is provided on the side plate 2 . The plug-in boss 13 is detachably plugged into the plug-in hole 21 .

[0053] The cooperation between the plug hole 21 and the plug boss 13 simplifies the structure, simplifies the connection steps and methods, and saves connection time.

[0054] In one embodiment, the plug-in boss 13 matches the shape of the plug-in hole 21 , and the outer peripheral wall of the plug-in boss 13 is interference-fitted with the groove wall of the plug-in hole 21 .

[0055] The outer peripheral wall of the plug-in protrusion 13 is interference-fitted with the groove wall of the plug-in hole 21, so that the connection between the plugged-in side plate 2 and the end plate body 1 is relatively stable and not easy to separate, thereby ensuring the stability of the entire end plate structure.

[0056] In one embodiment, the plug hole 21 is a bar-shaped hole.

[0057] The plug-in hole 21 is a strip-shaped hole, and the plug-in protrusion 13 is a strip-shaped column with matching shape, which has a simple structure and high matching strength.

[0058] As a changeable embodiment, the plug hole 21 may be a round hole, and the plug boss 13 may be a round column of matching shape. Alternatively, the plug hole 21 may be a rectangular hole, and the plug boss 13 may be a rectangular column of matching shape. The shapes of the plug hole 21 and the plug boss 13 are not limited here, as long as the shapes of the two match each other and are convenient for plugging.

[0059] In one embodiment, the interference H between the plug hole 21 and the plug boss 13 satisfies 0.05≤H≤0.1.

[0060] The interference between the plug hole 21 and the plug boss 13 can ensure that the plugging between the plug hole 21 and the plug boss 13 is stable and not easy to separate, and can also facilitate plugging and disassembly.

[0061] In a specific embodiment, the interference H between the plug hole 21 and the plug boss 13 is 0.05. In a specific embodiment, the interference H between the plug hole 21 and the plug boss 13 is 0.1.

[0062] In one embodiment, the plug hole 21 is a blind hole.

[0063] The plug-in hole 21 is a blind hole, and the opening of the plug-in hole 21 faces the end plate body 1, so that the end surface of the side plate 2 facing away from the end plate body 1 can maintain a relatively complete and beautiful appearance, facilitate hot melting of the bare battery cell insulating sheet, and better separate the tab 31 from the battery shell.

[0064] In one embodiment, the end face of the end plate body 1 facing the pole group 3 is a first end face, the end face of the pole group 3 provided with the pole ear 31 is a second end face 32 , and the first end face and the second end face 32 are slidably matched.

[0065] The sliding fit between the first end face and the second end face 32 can smoothly deliver the tab 31 through the opening 12 into the insertion space 11 , thereby preventing the tab 31 from being damaged by accidents such as flipping or tilting during the process of entering the insertion space 11 .

[0066] In one embodiment, two limiting grooves 14 are provided on the end plate body 1, and the two limiting grooves 14 are respectively arranged at the two ends of the opening 12 along the circumference of the annular insertion space 11, and the two ends of the side plate 2 are respectively arranged in the two limiting grooves 14, and the plug-in boss 13 is arranged on the bottom of the limiting groove 14.

[0067] The limiting groove 14 can limit and guide the movement of the side panel 2, thereby simplifying the assembly of the side panel 2; and the limiting groove 14 can accommodate the side panel 2, thereby enhancing the stability of the side panel 2 after the side panel 2 is assembled.

[0068] In one embodiment, the end surface of the side plate 2 facing away from the plug-in protrusion 13 and the outer surface of the end plate body 1 provided with the limiting groove 14 are located in the same plane.

[0069] The end surface of the side plate 2 facing away from the plug-in protrusion 13 is flush with the outer peripheral surface of the end plate body 1, so that the outer periphery of the end plate structure as a whole maintains a relatively complete and beautiful appearance, which is convenient for hot melting of the bare battery cell insulation sheet.

[0070] According to an embodiment of the present utility model, on the other hand, a battery is provided, including a pole group 3 and the above-mentioned end plate structure, and the ends of the pole group 3 are provided with pole ears 31; the pole ears 31 are penetrated in the interpenetration space 11 and enter the interpenetration space 11 through the opening 12.

[0071] The pole ear 31 can easily enter the insertion space 11 through the opening 12, which effectively reduces the difficulty of the pole ear 31 passing through the end plate structure, avoids poor assembly between the pole ear 31 and the end plate structure, and improves the assembly yield.

[0072] In one embodiment, the battery further includes a bare cell insulation sheet, which is heat-fused to the outer periphery of the end plate body 1 and the side plate 2 .

[0073] In a specific embodiment, the battery is a blade battery, and the electrode group 3 is a blade battery cell.

[0074] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An end plate structure, characterized in that: include: An end plate body, wherein an insertion space is provided on the end plate body, and the pole lugs of the pole group are suitable for being inserted into the insertion space; An opening is provided on one side of the end plate body, the opening is located at the side of the interpenetrating space and is connected with the interpenetrating space to form a groove-shaped space, and the pole ear is suitable for entering the interpenetrating space through the opening; The side plate is detachably connected to the opening and cooperates with the end plate body to form an annular interlaced space.

2. The end plate structure according to claim 1, characterized in that: The end plate body and the side plate are detachably plugged in.

3. The end plate structure according to claim 2, characterized in that: The end plate body is provided with an inserting hole, and the side plate is provided with an inserting boss, and the inserting boss is detachably inserted into the inserting hole.

4. The end plate structure according to claim 3, characterized in that: The plug-in boss matches the shape of the plug-in hole, and the outer peripheral wall of the plug-in boss is interference-fitted with the groove wall of the plug-in hole.

5. The end plate structure according to claim 4, characterized in that: The plug-in hole is a strip-shaped hole; And / or, the interference H between the plug-in hole and the plug-in boss satisfies 0.05≤H≤0.

1.

6. The end plate structure according to claim 3, characterized in that: The plug-in hole is a blind hole.

7. The end plate structure according to any one of claims 1 to 6, characterized in that: The end surface of the end plate body facing the pole group is a first end surface, the end surface of the pole group provided with a pole ear is a second end surface, and the first end surface is slidably matched with the second end surface.

8. The end plate structure according to any one of claims 3 to 6, characterized in that: Two limiting grooves are provided on the end plate body, and the two limiting grooves are respectively arranged at the two ends of the opening along the circumference of the annular insertion space, and the two ends of the side plate are respectively arranged in the two limiting grooves, and the plug-in boss is arranged on the groove bottom of the limiting groove.

9. The end plate structure according to claim 8, characterized in that: The end surface of the side plate facing away from the plug-in boss and the outer surface of the end plate body provided with the limiting groove are located in the same plane.

10. A battery, characterized in that: include: A pole group, each end of which is provided with a pole ear; In the end plate structure described in any one of claims 1 to 9, the pole lug is penetrated into the interpenetration space and enters the interpenetration space through the opening.

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