Battery cover plate and battery

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a battery cover plate and a battery, and the battery cover plate is characterized in that a cover plate main body is provided with a through hole; the welding block comprises a connecting structure and a main body structure, a hole body is formed in the main body structure, the connecting structure is connected with the inner wall of the hole body and divides the hole body into a mounting groove and a groove, the depth of the groove is B, B is larger than or equal to 0.3 mm, the main body structure penetrates through the through hole, and the main body structure is welded to the busbar; part of the poles are embedded into the mounting grooves and welded to the welding blocks, and the poles are connected with the tabs. According to the utility model, the depth size of the groove is limited, so that a welding spot is prevented from protruding out of the upper surface of the main body structure after the welding block is welded with the pole, the upper surface of the main body structure is ensured to flatly abut against the lower surface of the busbar, and the risk of pseudo soldering is reduced; the pole is directly connected with the tab, so that the use of connecting pieces is reduced, the occupied space of the pole in the battery shell is further reduced, and the utilization rate of the interior of the battery shell is improved.

Description

Technical Field

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

[0002] In new energy batteries, the battery cover plate is used to encapsulate the battery cell stack inside the battery housing, and the battery cover plate also undertakes the task of transmitting the battery energy to the outside. Therefore, the battery cover plate is very important for new energy batteries.

[0003] In the existing batteries, the riveting blocks are often welded to the bus bars to achieve electrical transmission. However, in the assembly process of the existing batteries, the welding between the riveting blocks and the bus bars is prone to occur the phenomenon of false welding, and the space utilization rate inside the battery housing is low, thereby resulting in poor overall performance of the battery. Summary of the Utility Model

[0004] In view of this, the utility model provides a battery cover plate and a battery to solve the problems that the welding between the riveting blocks and the bus bars is prone to occur the phenomenon of false welding, and the space utilization rate inside the battery housing is low.

[0005] In a first aspect, the utility model provides a battery cover plate, including: a cover plate main body, the cover plate main body is provided with a through hole; a welding block, the welding block includes a connecting structure and a main body structure, a hole body is formed inside the main body structure, the connecting structure is connected to the inner wall of the hole body, along the thickness direction of the battery cover plate, the connecting structure divides the hole body to form an installation groove and a groove, the depth of the groove is B, and 0.3mm≤B is satisfied, the main body structure penetrates through the through hole and is suitable for welding with the bus bar; a pole column, part of the pole column is embedded in the installation groove and is welded to the welding block, and the pole column is suitable for connecting with the pole ear.

[0006] Beneficial effects: By limiting the depth dimension of the groove, it is prevented that after the welding block is welded to the pole column, the welding point protrudes from the upper surface of the main body structure, thereby ensuring that the upper surface of the main body structure is in flat contact with the lower surface of the bus bar, and reducing the risk of false welding; by directly connecting the pole column with the pole ear, the use of connecting parts is reduced, thereby reducing the occupied space of the pole column inside the battery housing and improving the utilization rate inside the battery housing.

[0007] In an alternative embodiment, the main structure includes a first rib, a second rib and a connecting rib. The connecting rib is disposed through the perforation, and two ends of the connecting rib are respectively connected to the first rib and the second rib. The connecting structure is connected to the first rib, and the connecting structure and the first rib enclose to form the groove. The connecting structure, the first rib and the connecting rib enclose to form the installation groove. The second rib is connected to the pole column, and the first rib is adapted to be welded to the bus bar.

[0008] In an alternative embodiment, along the thickness direction of the battery cover plate, the thickness of the first rib is A, satisfying 2 mm ≤ A ≤ 3 mm.

[0009] Beneficial effect: By limiting the thickness dimension of the first rib, while ensuring the structural strength of the first rib, the height of the first rib is reduced, and thus the overall height of the battery cover plate is reduced.

[0010] In an alternative embodiment, along the thickness direction of the battery cover plate, the thickness of the second rib is D, satisfying 0.8 mm ≤ D ≤ 1.5 mm.

[0011] Beneficial effect: By limiting the thickness dimension of the second rib, while ensuring the connection strength between the second rib and the pole column, the height of the second rib is reduced, and thus the overall height of the battery cover plate is reduced.

[0012] In an alternative embodiment, along the thickness direction of the battery cover plate, the thickness of the main structure is E, satisfying 5 mm ≤ E ≤ 9 mm.

[0013] Beneficial effect: By limiting the thickness dimension of the main structure, while ensuring the overall structural strength of the main structure, the height of the main structure is reduced, and thus the overall height of the battery cover plate is reduced.

[0014] In an alternative embodiment, the thickness E of the main structure and the thickness A of the first rib satisfy 2 ≤ E / A ≤ 3.

[0015] Beneficial effect: Through further limitation of the thickness of the main structure and the thickness of the first rib, while ensuring the structural strength of the first rib, the thickness of the first rib is prevented from being too thick.

[0016] In an alternative embodiment, the thickness E of the main structure and the thickness D of the second rib satisfy 5 ≤ E / D ≤ 9.

[0017] Beneficial effect: Through further limitation of the thickness of the main structure and the thickness of the second rib, while ensuring the connection strength between the second rib and the pole column, the thickness of the second rib is prevented from being too thick.

[0018] In an alternative embodiment, in the thickness direction of the battery cover plate, the thickness of the connection structure is C, satisfying 0.8 mm ≤ C ≤ 1.3 mm, and B ≤ 0.6 mm.

[0019] Beneficial effects: By defining the thickness dimension of the connection structure, while ensuring the welding strength and performance between the welding block and the pole column, the risk of false welding generated by welding the welding block and the pole column is reduced.

[0020] In an alternative embodiment, the battery cover plate further includes an insulating member, and the insulating member is disposed between the first rib and the cover plate body; and / or, the insulating member is disposed between the second rib and the cover plate body.

[0021] In a second aspect, the present invention further provides a battery, including the above-mentioned battery cover plate; a housing, at least one end of the housing is provided with an opening, the battery cover plate is connected to the housing and seals the opening, and an installation cavity is formed by enclosing the housing and the battery cover plate; a pole group, disposed in the installation cavity, the pole group includes pole tabs, and the pole tabs are connected to the pole columns. Description of the Drawings

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the battery cover plate according to an embodiment of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the welding block according to an embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the battery according to an embodiment of the present invention.

[0026] Description of the Reference Numerals:

[0027] 10. Cover plate body; 20. Welding block; 21. Connection structure; 22. Main body structure; 221. First rib; 222. Second rib; 223. Connection rib; 23. Installation groove; 24. Groove; 30. Pole column; 31. Embedded part; 32. Flanging part; 40. Insulating member; 41. First plastic part; 42. Second plastic part; 50. Housing; 60. Pole group; 61. Pole tab. Detailed Embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0029] The following will describe the embodiments of the present utility model with reference to Figures 1 to 3 , and describe the embodiments of the present utility model.

[0030] According to an embodiment of the present utility model, in a first aspect, a battery cover plate is provided, which includes a cover plate main body 10, a welding block 20, and a pole post 30. The cover plate main body 10 is provided with a through hole; the welding block 20 includes a connection structure 21 and a main body structure 22. A hole body is formed inside the main body structure 22. The connection structure 21 is connected to the inner wall of the hole body. Along the thickness direction of the battery cover plate, the connection structure 21 divides the hole body to form an installation groove 23 and a groove 24. The depth of the groove 24 is B, satisfying 0.3 mm ≤ B. The main body structure 22 penetrates through the through hole and is adapted to be welded to a bus bar; a part of the pole post 30 is embedded in the installation groove 23 and welded to the welding block 20, and the pole post 30 is adapted to be connected to a tab 61.

[0031] By applying the battery cover plate of this embodiment, by limiting the depth dimension of the groove 24, after the welding block 20 and the pole post 30 are welded, it is prevented that the welding point protrudes from the upper surface of the main body structure 22, thereby ensuring that the upper surface of the main body structure 22 is in flat contact with the lower surface of the bus bar, and reducing the risk of virtual soldering; by directly connecting the pole post 30 to the tab 61, the use of connecting parts is reduced, thereby reducing the occupied space of the pole post 30 inside the battery case 50 and improving the utilization rate inside the battery case 50.

[0032] Specifically, the pole post 30 includes an embedded part 31 and a flanging part 32. The embedded part 31 is connected to the flanging part 32. The embedded part 31 is embedded in the installation groove 23 and welded to the connection structure 21, and the flanging part 32 is connected to the main body structure 22.

[0033] Specifically, the welding method of the connection structure 21 and the embedded part 31 is penetration welding.

[0034] It should be noted that in the related art, the upper surface of the connection structure 21 is flush with the upper surface of the main body structure 22. When penetration welding is performed between the connection structure 21 and the pole post 30, it is easy to form an upward protruding welding point. At this time, if the welding block 20 is welded to the bus bar, a virtual soldering part will be formed at the protruding welding point, thereby affecting the welding strength between the welding block 20 and the bus bar.

[0035] It can be understood that by setting the groove 24, after the penetration welding operation of the connecting structure 21 and the pole 30, the welding spot will be formed within the groove 24.

[0036] It should be noted that when B < 0.3, the depth of the groove 24 is relatively shallow, and the welding spot will still protrude from the upper surface of the main body structure 22. Therefore, in this embodiment, it is defined that 0.3 mm ≤ B to prevent the welding spot from protruding from the main body structure 22.

[0037] It should be noted that in the related art, the pole 30 in the battery cover plate is often connected to the tab 61 of the electrode group 60 through a connecting member, and the connecting member occupies part of the space inside the battery case 50, resulting in a decrease in the space utilization rate inside the battery case 50. In this application, by directly connecting the pole 30 and the tab 61, the connecting structure 21 is optimized, and then the occupied space of the connecting member in the related art is released, which can expand the capacity of the electrode group 60 and improve the performance of the battery.

[0038] In one embodiment, as Figure 2 shown, the main body structure 22 includes a first rib 221, a second rib 222, and a connecting rib 223. The connecting rib 223 is arranged through a through hole. Both ends of the connecting rib 223 are respectively connected to the first rib 221 and the second rib 222. The connecting structure 21 is connected to the first rib 221. The connecting structure 21 and the first rib 221 enclose to form the groove 24. The connecting structure 21, the first rib 221, and the connecting rib 223 enclose to form the installation groove 23. The second rib 222 is connected to the pole 30. The first rib 221 is suitable for welding with the bus bar.

[0039] Specifically, in this embodiment, the first rib 221, the second rib 222, and the connecting rib 223 are integrally formed.

[0040] Furthermore, the main body structure 22 can be integrally formed by casting, and other methods can also be used. For example, grooves 24 and installation grooves 23 are opened on the main body structure 22, etc.

[0041] Specifically, the flanging part 32 is connected to the second rib 222.

[0042] In one embodiment, as Figure 2 shown, along the thickness direction of the battery cover plate, the thickness of the first rib 221 is A, satisfying 2 mm ≤ A ≤ 3 mm. By limiting the thickness dimension of the first rib 221, while ensuring the structural strength of the first rib 221, the height of the first rib 221 is reduced, and then the overall height of the battery cover plate is reduced.

[0043] It should be noted that when A < 2 mm, the thickness of the first rib 221 is too thin, and the structural strength of the first rib 221 is too low, so the first rib 221 is likely to be damaged when contacting the busbar; when A > 3 mm, the thickness of the first rib 221 is too thick, which affects the overall height of the battery cover plate, and further affects the overall height of the battery.

[0044] In one embodiment, as Figure 2 shown, along the thickness direction of the battery cover plate, the thickness of the second rib 222 is D, satisfying 0.8 mm ≤ D ≤ 1.5 mm. By limiting the thickness dimension of the second rib 222, while ensuring the connection strength between the second rib 222 and the pole 30, the height of the second rib 222 is reduced, and further the overall height of the battery cover plate is reduced.

[0045] It should be noted that when D < 0.8 mm, the thickness of the second rib 222 is too thin. During the welding process, due to the fast heat transfer and difficult control of the second rib 222, the phenomenon of burn-through is likely to occur, that is, the welding heat is overly concentrated, resulting in the second rib 222 being penetrated and forming holes, which affects the welding strength and sealing performance; when D > 1.5 mm, the thickness of the second rib 222 is too thick, which affects the overall height of the battery cover plate, and further affects the overall height of the battery.

[0046] In one embodiment, as Figure 2 shown, along the thickness direction of the battery cover plate, the thickness of the main body structure 22 is E, satisfying 5 mm ≤ E ≤ 9 mm. By limiting the thickness dimension of the main body structure 22, while ensuring the overall structural strength of the main body structure 22, the height of the main body structure 22 is reduced, and further the overall height of the battery cover plate is reduced.

[0047] It should be noted that when E < 5 mm, the overall thickness of the main body structure 22 is relatively thin, and the structural strength of the main body structure 22 is relatively low, which is not conducive to contact and connection with other structures; when E > 9 mm, the thickness of the main body structure 22 is too thick, which affects the overall height of the battery cover plate, and further affects the overall height of the battery.

[0048] In one embodiment, as Figure 2 shown, the thickness E of the main body structure 22 and the thickness A of the first rib 221 satisfy 2 ≤ E / A ≤ 3. Through further limitation of the thickness of the main body structure 22 and the thickness of the first rib 221, while ensuring the structural strength of the first rib 221, the thickness of the first rib 221 is prevented from being too thick.

[0049] It should be noted that after limiting the thickness of the main body structure 22, the thickness of the first rib 221 is further limited through the proportional relationship to prevent the first rib 221 from being too thick, thereby causing the thickness of other structures to be relatively low and the structural strength to be insufficient.

[0050] In one embodiment, as Figure 2 shown, the thickness E of the main body structure 22 and the thickness D of the second rib 222 satisfy 5 ≤ E / D ≤ 9. By further defining the thickness of the main body structure 22 and the thickness of the second rib 222, while ensuring the connection strength between the second rib 222 and the terminal post 30, the thickness of the second rib 222 is prevented from being too thick.

[0051] It should be noted that after defining the thickness of the main body structure 22, the thickness of the second rib 222 is further defined by the proportional relationship to prevent the second rib 222 from being too thick, which may lead to a lower thickness of other structures and insufficient structural strength.

[0052] In one embodiment, as Figure 2 shown, along the thickness direction of the battery cover plate, the thickness of the connecting structure 21 is C, satisfying 0.8 mm ≤ C ≤ 1.3 mm, and B ≤ 0.6 mm. By defining the thickness dimension of the connecting structure 21, while ensuring the welding strength and performance between the welding block 20 and the terminal post 30, the risk of false welding generated during the welding of the welding block 20 and the terminal post 30 is reduced.

[0053] Specifically, the welding method between the connecting structure 21 and the terminal post 30 is penetration welding.

[0054] It should be noted that when C < 0.8 mm, the thickness of the connecting structure 21 is too thin, and various deformation forms such as bending deformation, wave deformation, angular deformation, and shrinkage deformation are likely to occur during the welding of the connecting structure 21. During the welding process, if air bubbles cannot overflow in time or welding slag cannot be completely removed, defects such as pores or slag inclusions may be formed in the weld, thus affecting the welding strength; when C > 1.3 mm, the thickness of the connecting structure 21 is too thick, and the local heat is uneven during the welding process of the connecting structure 21, and penetration welding is prone to welding defects such as incomplete fusion and incomplete penetration, resulting in false welding.

[0055] In one embodiment, as Figure 1 shown, the battery cover plate further includes an insulating member 40. The insulating member 40 includes a first plastic part 41 and a second plastic part 42. The first plastic part 41 is disposed between the first rib 221 and the cover plate main body 10, and the second plastic part 42 is disposed between the second rib 222 and the cover plate main body 10.

[0056] It is worth noting that by providing the first plastic part 41 and the second plastic part 42, the normal operation of the internal circuit of the battery is ensured, and the second plastic part 42 also plays a role in supporting and protecting the internal structure of the battery.

[0057] Of course, in other alternative embodiments, the battery cover plate may also only provide the first plastic part 41 between the first rib 221 and the cover plate main body 10, or alternatively, the battery cover plate may also only provide the second plastic part 42 between the second rib 222 and the cover plate main body 10.

[0058] According to an embodiment of the present utility model, in a second aspect, a battery is further provided, which includes the above-mentioned battery cover plate, a housing 50, and a pole group 60. At least one end of the housing 50 is provided with an opening, the battery cover plate is connected to the housing 50 and seals the opening, and the housing 50 and the battery cover plate enclose an installation cavity; the pole group 60 is disposed in the installation cavity, and the pole group 60 includes pole tabs 61, and the pole tabs 61 are connected to a pole post 30.

[0059] Specifically, please refer to Figure 3 , the pole group 60 is disposed inside the housing 50, the pole tabs 61 are directly connected to the pole post 30 of the battery cover plate, and the battery cover plate is connected to the housing 50 to seal the housing 50.

[0060] Although the embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the present utility model.

Claims

1. A battery cover plate, characterized in that, Comprising: A cover body, in which a perforation is formed. A welding block, which includes a connection structure and a main body structure. A hole body is formed inside the main body structure. The connection structure is connected to the inner wall of the hole body. Along the thickness direction of the battery cover, the connection structure divides the hole body into an installation groove and a groove. The depth of the groove is B, satisfying 0.3mm ≤ B. The main body structure penetrates through the perforation, and the main body structure is suitable for welding with a bus bar. A pole column, part of which is embedded in the installation groove and welded to the welding block. The pole column is suitable for connecting with a tab.

2. The battery cover plate according to claim 1, wherein, The main body structure includes a first rib, a second rib and a connecting rib. The connecting rib penetrates through the perforation. Two ends of the connecting rib are respectively connected to the first rib and the second rib. The connection structure is connected to the first rib. The connection structure and the first rib enclose to form the groove. The connection structure, the first rib and the connecting rib enclose to form the installation groove. The second rib is connected to the pole column, and the first rib is suitable for welding with a bus bar.

3. The battery cover plate according to claim 2, wherein Along the thickness direction of the battery cover, the thickness of the first rib is A, satisfying 2mm ≤ A ≤ 3mm.

4. The battery cover plate according to claim 2, characterized in that, Along the thickness direction of the battery cover, the thickness of the second rib is D, satisfying 0.8mm ≤ D ≤ 1.5mm.

5. The battery cover plate according to any one of claims 2-4, characterized in that, Along the thickness direction of the battery cover, the thickness of the main body structure is E, satisfying 5mm ≤ E ≤ 9mm.

6. The battery cover plate according to claim 5, characterized in that, The thickness E of the main body structure and the thickness A of the first rib satisfy 2 ≤ E / A ≤ 3.

7. The battery cover plate according to claim 5, characterized in that, The thickness E of the main body structure and the thickness D of the second rib satisfy 5 ≤ E / D ≤ 9.

8. The battery cover plate according to any one of claims 1-4, characterized in that, Along the thickness direction of the battery cover, the thickness of the connection structure is C, satisfying 0.8mm ≤ C ≤ 1.3mm, and B ≤ 0.6mm.

9. The battery cover plate according to any one of claims 2-4, characterized in that, The battery cover further includes an insulating part, which is arranged between the first rib and the cover body; and / or, the insulating part is arranged between the second rib and the cover body.

10. A battery, characterized in that, Comprising: The battery cover according to any one of claims 1 to 9; A housing, at least one end of which is provided with an opening. The battery cover is connected to the housing and seals the opening. The housing and the battery cover enclose to form an installation cavity. A pole group, which is arranged in the installation cavity. The pole group includes tabs, and the tabs are connected to the pole columns.

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