Battery cover plate, battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cover plate, a battery and a battery pack, and the battery cover plate comprises a cover plate body provided with a through hole; the pole is arranged on the cover plate body; the side, close to the first end, of the connecting piece is connected with the pole, the side, close to the second end, of the connecting piece and the through hole are oppositely arranged in a spaced mode, and the face, facing the through hole, of the connecting piece is suitable for being connected with a tab. According to the battery cover plate, the tabs are connected to the surfaces, facing the through holes, of the connecting sheets, so that the tabs and the pole columns are connected to the same surfaces of the connecting sheets, the overall thickness of the battery cover plate is reduced, that is, the occupation of the internal space of the battery is reduced along the thickness direction of the battery cover plate, the utilization rate of the internal space of the battery is improved, and the energy density of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover, a battery and a battery pack. Background Art

[0002] The battery primarily consists of a cover plate (which integrates the electrode, explosion-proof valve, upper and lower plastics, and injection port), a connecting plate, an electrode assembly, and a housing. Laser welding of the cover plate and housing creates a mechanically strong, enclosed space that protects the electrode assembly. The connecting plate also electrically connects the electrode tabs to the electrode. In the prior art, the tabs are typically gathered and bent multiple times into an S-shape. The tabs are then welded to one side of the connecting plate, and the electrode is welded to the other side of the connecting plate. This increases the internal space occupied by the battery and reduces space utilization. Utility Model Content

[0003] In view of this, the present invention provides a battery cover, a battery and a battery pack to solve the problem in the prior art that the connection method of the tabs, the poles and the connecting pieces increases the space occupied by the battery and reduces the space utilization rate inside the battery.

[0004] In the first aspect, the utility model provides a battery cover, comprising: a cover body, provided with a through hole; a pole, arranged on the cover body; a connecting piece, wherein the side of the connecting piece close to the first end is connected to the pole, the side of the connecting piece close to the second end is arranged relative to the through hole, and the side of the connecting piece facing the through hole is suitable for connecting to the pole ear.

[0005] Beneficial effect: The tab is connected to the side of the connecting piece facing the through hole, so that the tab and the pole are connected to the same side of the connecting piece, which reduces the overall thickness of the battery cover, that is, reduces the occupation of the internal space of the battery along the thickness direction of the battery cover, thereby improving the space utilization inside the battery and improving the energy density of the battery.

[0006] In an optional embodiment, the connecting piece is formed with an escape space extending through the connecting piece in a thickness direction, and the escape space is communicated with the through hole.

[0007] Beneficial effect: By setting the avoidance space, the tab is facilitated to extend from the side of the connecting piece away from the cover body to the side of the connecting piece close to the cover body, thereby avoiding interference between the tab and the connecting piece during assembly.

[0008] In an optional embodiment, the battery cover further includes a blocking plate, which is disposed in the through hole and connected to the cover body to block the through hole.

[0009] Beneficial effect: After the tabs are connected to the connecting pieces, the through holes are sealed by the sealing plates to ensure the sealing of the battery.

[0010] In an optional embodiment, the connecting piece includes a pole connecting portion and a tab connecting portion that are connected to each other, the pole connecting portion is connected to the pole, and the tab connecting portion is arranged corresponding to the through hole.

[0011] Beneficial effect: The pole connecting portion is connected to the pole, and the tab connecting portion is connected to the tab, thereby achieving electrical connection between the pole and the tab.

[0012] In an optional embodiment, the connecting piece is a flat plate structure.

[0013] Beneficial effect: The connecting piece is set as a flat plate structure, which can realize simultaneous connection with the pole and the lug, simplifies the overall structure of the connecting piece, and facilitates the processing and forming of the connecting piece.

[0014] In an optional embodiment, the battery cover further includes an insulating member, which is arranged on a side of the cover body facing the connecting piece, at least part of the insulating member is located between the cover body and the connecting piece, and the insulating member is provided with a through hole, which is connected to the through hole.

[0015] Beneficial effect: By providing an insulating member, the insulation performance between the cover plate body and the pole group is ensured, and perforations are provided on the insulating member to avoid interference with the pole lug.

[0016] In a second aspect, the present invention further provides a battery, comprising: the above-mentioned battery cover; a pole group, comprising a pole ear, wherein the pole ear is connected to a side of the connecting piece facing the through hole.

[0017] Beneficial effect: Along the thickness direction of the battery cover, the battery cover reduces the space occupied by the battery, thereby improving the space utilization rate inside the battery and increasing the energy density of the battery.

[0018] In an optional embodiment, the tab extends from a side of the connecting piece away from the cover body to a side of the connecting piece close to the cover body, and the tab is bent to be connected to the connecting piece.

[0019] Beneficial effect: After the tab passes through the connecting piece in the vertical direction, the tab can be bent once to fit and connect the tab to the connecting piece, which simplifies the bending process of the tab and improves production efficiency.

[0020] In an optional embodiment, the battery further includes a shell, which is hollow and has an opening formed at at least one end. The battery cover is arranged corresponding to the opening and is connected to the shell to seal the opening. The shell and the battery cover together form a accommodating space, and the electrode group is arranged in the accommodating space.

[0021] In a third aspect, the present invention further provides a battery pack comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 any creative work.

[0023] Figure 1 This is a schematic structural diagram of a battery cover plate at one angle according to an embodiment of the present invention (the blocking plate is not shown);

[0024] Figure 2 for Figure 1 A schematic structural diagram of the battery cover shown in another angle;

[0025] Figure 3 for Figure 1 A top view of the battery cover shown;

[0026] Figure 4 for Figure 3 Cross-sectional view in the AA direction;

[0027] Figure 5 This is a structural schematic diagram of another battery cover according to an embodiment of the present invention at one angle (the blocking plate is not shown);

[0028] Figure 6 for Figure 5 A schematic structural diagram of the battery cover shown in another angle;

[0029] Figure 7 for Figure 5 A top view of the battery cover shown;

[0030] Figure 8 for Figure 7 Cross-sectional view in the middle BB direction;

[0031] Figure 9 Schematic diagram of the matching structure of the electrode group and the connecting piece in an embodiment of the present utility model (the electrode tab is not bent);

[0032] Figure 10 For the ear Figure 9 A schematic diagram of the battery structure in the state shown;

[0033] Figure 11 for Figure 10 a top view of the battery shown;

[0034] Figure 12 for Figure 11 Cross-sectional view in CC direction;

[0035] Figure 13 Schematic diagram of the matching structure of the electrode group and the connecting piece in an embodiment of the utility model (after the electrode tab is bent);

[0036] Figure 14 For the ear Figure 13 A schematic diagram of the battery structure in the state shown;

[0037] Figure 15 for Figure 14 a top view of the battery shown;

[0038] Figure 16 for Figure 15 Cross-sectional view in the middle DD direction;

[0039] Figure 17 This is a schematic structural diagram of a battery according to an embodiment of the present utility model;

[0040] Figure 18 for Figure 17 a top view of the battery shown;

[0041] Figure 19 for Figure 18 Cross-sectional view along the EE direction.

[0042] Description of reference numerals:

[0043] 1. Cover body; 11. Through hole; 2. Pole; 3. Connecting piece; 31. Avoidance space; 32. Pole connection part; 33. Tab connection part; 4. Sealing plate; 5. Insulator; 51. Perforation; 10. Battery cover; 20. Pole group; 21. Tab; 30. Shell. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are 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 those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0045] The following combination Figures 1 to 19 , describing the embodiments of the present utility model.

[0046] According to an embodiment of the present invention, on the one hand, a battery cover 10 is provided, including: a cover body 1, which is provided with a through hole 11; a pole 2, which is arranged on the cover body 1; a connecting piece 3, wherein the side of the connecting piece 3 close to the first end is connected to the pole 2, and the side of the connecting piece 3 close to the second end is arranged relative to the through hole 11, and the side of the connecting piece 3 facing the through hole 11 is suitable for connecting the pole ear 21.

[0047] The tab 21 is connected to the side of the connecting piece 3 facing the through hole 11, so that the tab 21 and the pole 2 are connected to the same side of the connecting piece 3, thereby reducing the overall thickness of the battery cover 10, that is, reducing the occupation of the internal space of the battery along the thickness direction of the battery cover 10, thereby improving the space utilization inside the battery and improving the energy density of the battery.

[0048] It should be noted that in related art, the pole 2 is connected to the side of the connecting piece 3 facing the cover body 1, and the tab 21 is connected to the side of the connecting piece 3 facing away from the cover body 1. Therefore, the tab 21 needs to occupy the internal space of the battery. In this embodiment, however, both the pole 2 and the tab 21 are connected to the side of the connecting piece 3 facing the cover body 1. Therefore, the tab 21 can utilize the space between the connecting piece 3 and the cover body 1, thereby avoiding additional occupation of the internal space of the battery, improving the utilization rate of the battery space, and thus improving the energy density of the battery.

[0049] It is worth noting that when the electrode group 20 is assembled with the battery cover 10, the electrode tab 21 of the electrode group 20 is inserted from the side of the connecting piece 3 away from the cover body 1 toward the side of the connecting piece 3 close to the cover body 1. By providing the through hole 11, the electrode tab 21 can be avoided during the insertion process of the electrode tab 21 to prevent the electrode tab 21 from interfering with the cover body 1; and the electrode tab 21 is connected to the connecting piece 3 by welding, and by providing the through hole 11, the welding operation can be performed at the through hole 11.

[0050] In one embodiment, Figure 2 、 Figure 6 and Figure 9 As shown, the connecting piece 3 is formed with an escape space 31 extending through the thickness direction, and the escape space 31 is connected to the through hole 11. The provision of the escape space 31 facilitates the extension of the tab 21 from the side of the connecting piece 3 away from the cover body 1 to the side of the connecting piece 3 close to the cover body 1, thereby preventing interference between the tab 21 and the connecting piece 3 during assembly.

[0051] It is worth noting that, please refer to Figure 9In one embodiment, the edge of the connecting piece 3 has a notch to form an escape space 31.

[0052] Of course, in other alternative embodiments, the avoidance space 31 may be a avoidance hole opened on the connecting piece 3 .

[0053] It is worth noting that, please refer to Figure 10 and Figure 13 The tab 21 passes through the avoidance space 31 and is inserted into the through hole 11. The tab 21 is then bent at the through hole 11 so that the tab 21 and the connecting piece 3 are fitted together on the side facing the through hole 11. The tab 21 and the connecting piece 3 can then be welded at the through hole 11.

[0054] It should be noted that the location of the avoidance space 31 can be specifically set according to the need for cooperation with the tab 21 .

[0055] In one embodiment, Figures 17 to 19 As shown, the battery cover 10 further includes a blocking plate 4, which is disposed in the through hole 11 and connected to the cover body 1 to block the through hole 11. After the tab 21 is connected to the connecting piece 3, the through hole 11 is blocked by the blocking plate 4 to ensure the sealing of the battery.

[0056] It is worth noting that the blocking plate 4 and the cover plate body 1 are welded together.

[0057] In one embodiment, Figure 2 and Figure 6 As shown, the connecting piece 3 includes a pole connecting portion 32 and a tab connecting portion 33 that are connected to each other. The pole connecting portion 32 is connected to the pole 2, and the tab connecting portion 33 is corresponding to the through hole 11. The pole connecting portion 32 is connected to the pole 2, and the tab connecting portion 33 is connected to the tab 21, thereby achieving electrical connection between the pole 2 and the tab 21.

[0058] It is worth noting that if Figure 2 and Figure 6 As shown, the escape space 31 is provided at the tab connection portion 33. Specifically, one side edge of the tab connection portion 33 is offset relative to the same side edge of the pole connection portion 32 to form the escape space 31.

[0059] Of course, in other alternative embodiments, the avoidance space 31 is a avoidance hole, which is opened on the tab connection portion 33 .

[0060] In one embodiment, Figure 2 and Figure 6 As shown, the connecting piece 3 is a flat plate structure. Setting the connecting piece 3 as a flat plate structure can achieve simultaneous connection with the pole 2 and the tab 21, while simplifying the overall structure of the connecting piece 3 and facilitating the processing and forming of the connecting piece 3.

[0061] It is worth noting that in the related art, the connecting piece 3 is usually a special-shaped structure with a bent structure, a stepped structure, or a protruding structure to facilitate matching with the pole 2 and the tab 21. In this embodiment, the connecting piece 3 is a flat structure, and does not need to be provided with a bent structure, a stepped structure, or a protruding structure, so that the overall structure of the connecting piece 3 is simple, the processing process is simplified, and the processing cost is reduced.

[0062] In one embodiment, Figure 4 and Figure 8 As shown, the battery cover 10 further includes an insulating member 5, which is disposed on the side of the cover body 1 facing the connecting piece 3. At least a portion of the insulating member 5 is located between the cover body 1 and the connecting piece 3. The insulating member 5 is provided with a through-hole 51, which is correspondingly connected to the through-hole 11. The provision of the insulating member 5 ensures insulation performance between the cover body 1 and the electrode group 20, and the provision of the through-hole 51 on the insulating member 5 prevents interference with the electrode tab 21.

[0063] It is worth noting that, in this embodiment, the insulating member 5 is the lower plastic.

[0064] According to another aspect of an embodiment of the present invention, a battery is provided, comprising: the aforementioned battery cover 10 and an electrode assembly 20. The electrode assembly 20 includes a tab 21, which is connected to the side of the connecting piece 3 facing the through-hole 11. As a result, along the thickness direction of the battery cover 10, the battery cover 10 reduces the space occupied by the battery interior, thereby improving the space utilization within the battery and increasing the battery's energy density.

[0065] In one embodiment, Figures 9 to 16 As shown, the tab 21 extends from the side of the connecting piece 3 away from the cover body 1 to the side of the connecting piece 3 close to the cover body 1, and the tab 21 is bent to connect with the connecting piece 3. After the tab 21 passes through the connecting piece 3 in the vertical direction, the tab 21 is bent once to fit the tab 21 with the connecting piece 3, which simplifies the bending process of the tab 21 and improves production efficiency.

[0066] It is worth noting that in the related art, the tab 21 needs to be bent multiple times to form an approximate S-shape and then welded to the connecting piece 3. Therefore, the bending and welding of the tab 21 are inconvenient, which affects the improvement of production efficiency.

[0067] In this embodiment, the tab 21 only needs to be bent once, the bending method is simple, and the tab 21 can be connected to the connecting piece 3 by welding at the through hole 11. The welding process is easy to implement, thereby improving the production efficiency of the battery.

[0068] In one embodiment, Figure 12、 Figure 16 and Figure 19 As shown, the battery further includes a shell 30, which is hollow and has an opening formed at at least one end thereof. The battery cover 10 is arranged corresponding to the opening and is connected to the shell 30 to seal the opening. The shell 30 and the battery cover 10 enclose a receiving space, and the electrode group 20 is arranged in the receiving space.

[0069] Specifically, in this embodiment, Figure 12 、 Figure 16 and Figure 19 As shown, both ends of the housing 30 are formed with openings, so there are two battery cover plates 10, and the two battery cover plates 10 are respectively provided corresponding to the two openings. Figures 1 to 8 , one of the battery cover plates 10 is a positive electrode cover plate, that is, the electrode post 2 on the cover plate body 1 is a positive electrode post 2, and the other battery cover plate 10 is a negative electrode cover plate, that is, the electrode post 2 on the cover plate body 1 is a negative electrode post 2. Of course, in other alternative embodiments, the positive electrode post 2 and the negative electrode post 2 can be located on the same cover plate body 1, that is, one cover plate body 1 is provided with both a positive electrode post 2 and a negative electrode post 2. Accordingly, two connecting pieces 3 are also provided, one connecting piece 3 connects the positive electrode tab 21 and the positive electrode post 2, and the other connecting piece 3 connects the negative electrode tab 21 and the negative electrode post 2.

[0070] As an alternative embodiment, the housing 30 may have an opening at only one end, with the other end of the housing 30 being a closed bottom plate. Therefore, the battery cover 10 is provided with a corresponding opening. Specifically, the positive electrode column 2 and the negative electrode column 2 may both be provided on the cover body 1, or one of the positive electrode column 2 and the negative electrode column 2 may be provided on the cover body 1, and the other of the positive electrode column 2 and the negative electrode column 2 may be provided on the bottom plate.

[0071] According to another aspect of an embodiment of the present invention, a battery pack is provided, comprising the above-mentioned battery.

[0072] Although the embodiments of the present invention have been described with reference to 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 shall fall within the scope defined by the appended claims.

Claims

1. A battery cover, characterized in that: include: The cover body is provided with a through hole; A pole, provided on the cover body; A connecting piece, wherein a side of the connecting piece close to the first end is connected to the pole, a side of the connecting piece close to the second end is spaced apart from the through hole, and a side of the connecting piece facing the through hole is suitable for connecting to the pole ear.

2. The battery cover according to claim 1, characterized in that: The connecting piece is formed with an escape space penetrating along the thickness direction, and the escape space is communicated with the through hole.

3. The battery cover according to claim 1 or 2, characterized in that: The battery cover further includes a blocking plate, which is disposed in the through hole and connected to the cover body to block the through hole.

4. The battery cover according to claim 1 or 2, characterized in that: The connecting piece includes a pole connecting portion and a tab connecting portion which are connected to each other. The pole connecting portion is connected to the pole, and the tab connecting portion is arranged corresponding to the through hole.

5. The battery cover according to claim 1 or 2, characterized in that: The connecting piece is a flat plate structure.

6. The battery cover according to claim 1 or 2, characterized in that: The battery cover also includes an insulating member, which is arranged on the side of the cover body facing the connecting piece. At least part of the insulating member is located between the cover body and the connecting piece. The insulating member is provided with a through hole, and the through hole is connected to the through hole.

7. A battery, characterized in that: include: The battery cover according to any one of claims 1 to 6; The electrode group includes a pole ear, and the pole ear is connected to a side of the connecting piece facing the through hole.

8. The battery according to claim 7, characterized in that The tab extends from a side of the connecting piece away from the cover body to a side of the connecting piece close to the cover body, and the tab is bent to be connected to the connecting piece.

9. The battery according to claim 7, characterized in that The battery also includes a shell, which is hollow and has an opening formed at at least one end. The battery cover is arranged corresponding to the opening and connected to the shell to seal the opening. The shell and the battery cover together form a storage space, and the electrode group is arranged in the storage space.

10. A battery pack, characterized in that: A battery comprising the battery according to any one of claims 7 to 9.

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