Battery monomer and electric equipment

Abstract

The utility model relates to a battery monomer and electric equipment. The battery monomer comprises a top cover, the battery cell is provided with a battery cell main body, a first tab and a second tab, the battery cell main body comprises a first end face arranged towards the top cover, and the first tab and the second tab are both led out from the first end face; the first tab comprises a first bending part and a second bending part, and the second tab comprises a third bending part; in the first direction, the first bending part and the third bending part are arranged at an interval; in the second direction, the second bending part and the third bending part are respectively positioned on two sides of the central surface of the battery cell main body, and the central surface of the battery cell main body is perpendicular to the second direction. The battery monomer is provided with the first tab and the second tab, and the second bending part and the third bending part are respectively positioned on the two sides of the central surface of the battery cell main body, so that the two sides of the top cover along the central line of the top cover can be simultaneously supported, the top cover is kept balanced, and one side of the top cover is prevented from being suspended.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to battery monomers and electrical equipment. Background Art

[0002] With the gradual increase in the market share of new energy vehicles, in order to further seize the market share, the launch speed of new models of current new energy vehicle manufacturers has gradually accelerated. Facing the increasingly diversified model choices in the current new energy market, while new energy vehicle customer groups pay attention to performance areas such as cruising range, energy replenishment speed, and driving comfort, price has gradually become an important factor for new energy vehicle owners to consider.

[0003] As the energy sector of new energy vehicles, cost reduction of batteries will be an important goal for cost reduction of new energy vehicles. Battery cost reduction is mainly divided into two dimensions: design cost reduction, such as cost reduction of material systems and improvement of utilization rate; manufacturing cost reduction, such as simplifying processes, shortening process flow time, and improving manufacturing yield, etc.

[0004] Considering both the design and manufacturing dimensions, the battery cell gradually tries single-roll core design. The application of single-roll core design improves the utilization rate of battery cell materials (negative electrode materials, separators, copper foils, etc.) and space utilization rate. At the same time, it cancels the A+B pairing welding process of the battery cell and improves the overall manufacturing yield, further reducing the fixed investment of equipment.

[0005] However, due to the single-roll core design, during the connection process between the tab and the cover plate assembly, the two tabs are bent in the same direction in the thickness direction of the roll core to facilitate connection with the cover plate assembly. This bending method causes the bent parts of the two tabs to only stack on one side in the thickness direction of the roll core, resulting in a certain support on the side where the cover plate assembly is connected to the tab, while there is no support on the opposite side where the cover plate assembly is not connected to the tab, that is, the cover plate assembly is in a suspended state above the roll core. Since one side of the cover plate assembly is supported and the other side is suspended, the entire cover plate assembly has a tendency to tilt towards the suspended side; thus, during the subsequent sealing welding process, it is very easy to cause the pole column of the cover plate assembly to tilt, further affecting the subsequent whole-pack welding. Summary of the Utility Model

[0006] The embodiments of the present application provide a battery monomer and electrical equipment to solve the technical problem of pole column tilt existing in the prior art.

[0007] To solve the above technical problem, the embodiment of the utility model provides a battery monomer, including

[0008] A top cover, on which a first pole column and a second pole column are provided;

[0009] The battery cell has a battery cell body, a first tab and a second tab. The battery cell body includes a first end face facing the top cover. The first tab and the second tab are both led out from the first end face of the battery cell body.

[0010] Wherein, the first tab includes a first bending portion and a second bending portion, and the second tab includes a third bending portion. In a first direction, the first bending portion of the first tab and the third bending portion of the second tab are arranged at intervals. In a second direction, the second bending portion of the first tab and the third bending portion of the second tab are respectively located on both sides of the central plane of the battery cell body. The central plane of the battery cell body is perpendicular to the second direction, and the first direction and the second direction are perpendicular to each other.

[0011] In an embodiment of the present utility model, the first tab further includes a first connecting portion. One end of the second bending portion away from the battery cell body is connected to the first connecting portion. The first connecting portion is connected to the first pole through a first connecting member.

[0012] The second tab further includes a second connecting portion. One end of the third bending portion away from the battery cell body is connected to the second connecting portion. The second connecting portion is connected to the second pole through a second connecting member.

[0013] In an embodiment of the present utility model, in the second direction, the maximum width of the first connecting member is L3, and the thickness of the battery cell body is T. Wherein, L3 = a2×T - b2, 0.3 ≤ a2 ≤ 1.0, 1mm ≤ b2 ≤ 5mm.

[0014] In an embodiment of the present utility model, the first connecting member includes a first connecting section and a second connecting section. The first tab further includes a transition portion. The transition portion connects the second bending portion and the first bending portion. The first connecting section connects the first pole. The second connecting section is located between the first connecting portion and the transition portion. In a third direction, the side surface of the second connecting section facing away from the battery cell body is closer to the battery cell body than the side surface of the first connecting section facing away from the battery cell body. The third direction and the second direction are perpendicular to each other.

[0015] In an embodiment of the present utility model, in the third direction, the distance between the side surface of the second connecting section facing away from the battery cell body and the first end face of the battery cell body is H1, and the distance between the side surface of the first connecting section facing away from the battery cell body and the first end face of the battery cell body is H2. Wherein, 0.5mm ≤ H2 - H1 ≤ 3.0mm.

[0016] In an embodiment of the present utility model, the length of the first tab extending from the battery cell body is L1, and the length of the second tab extending from the battery cell body is L2, where 10 mm ≤ L1 - L2 ≤ 40 mm.

[0017] In an embodiment of the present utility model, the thickness of the battery cell body in the second direction is T, and the length of the first tab extending from the battery cell body is L1, where L1 = a1×T + b1, 1.5 ≤ a1 ≤ 2.5, and 0 ≤ b1 ≤ 25 mm.

[0018] In an embodiment of the present utility model, in the third direction, one side of the second connecting portion facing away from the battery cell body contacts the second connecting member, and a first insulating adhesive is provided on one side of the second connecting portion facing the battery cell body, and the first insulating adhesive covers a first welding mark formed by welding the second connecting portion and the second connecting member.

[0019] In an embodiment of the present utility model, in the third direction, one side of the first connecting portion facing the battery cell body contacts the first connecting member, and a second insulating adhesive is provided on one side of the first connecting portion facing away from the battery cell body, and the second insulating adhesive covers a second welding mark formed by welding the first connecting portion and the first connecting member.

[0020] An embodiment of the present utility model further provides an electrical device, including the battery cell as described above.

[0021] The above technical solution of the present utility model has at least the following advantages compared with the prior art:

[0022] The battery cell and the electrical device provided by the present utility model are provided with a first tab that is bent twice and a second tab that is bent once. The second bent portion of the first tab and the third bent portion of the second tab are respectively located on both sides of the central plane of the battery cell body. Correspondingly in space, the second bent portion of the first tab and the third bent portion of the second tab are respectively located below both sides of the central plane of the top cover. In this way, the first tab and the second tab can simultaneously support both ends of the top cover in the second direction, so that the top cover is kept balanced, avoiding one side of the top cover from being suspended, and ultimately avoiding the pole on the top cover from tilting, ensuring the quality of subsequent whole-pack welding.

[0023] In addition, due to a certain height difference between the first tab and the second tab, through the height adjustment effect of the first connecting member and the second connecting member, the area where the first connecting member connects the top cover can be made flush with the area where the second connecting member connects the top cover, and further the top cover can be kept in a horizontal and balanced state, ultimately avoiding the pole on the top cover from tilting, and further ensuring the quality of subsequent whole-pack welding. Description of the Drawings

[0024] To make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments of the present utility model and in conjunction with the attached drawings, wherein

[0025] Figure 1 is a schematic structural view of the battery cell in the present utility model;

[0026] Figure 2 is a schematic structural view of the battery cell in the present utility model;

[0027] Figure 3 is the front view of the battery cell in the present utility model;

[0028] Figure 4 is the side view comparison diagram of the first tab and the second tab in Embodiment 1 of the present utility model;

[0029] Figure 5 is the schematic structure of the first connecting member in Embodiment 1 of the present utility model Figure 1 ;

[0030] Figure 6 is the schematic structure of the first connecting member in Embodiment 1 of the present utility model Figure 2 ;

[0031] Figure 7 is the side view comparison diagram of the first tab and the second tab in Embodiment 2 of the present utility model.

[0032] Explanation of reference numerals in the drawings of the specification: 10, battery cell body; 11, first end face; 12, central plane of the battery cell body; 20, first tab; 21, root of the first tab; 22, first bending part; 23, transition part; 24, second bending part; 25, first connecting part; 30, second tab; 31, root of the second tab; 32, third bending part; 33, second connecting part; 40, top cover; 50, first connecting member; 51, first connecting section; 52, second connecting section; 53, connecting section; 54, connecting surface; 60, second connecting member. Specific embodiments

[0033] The following further illustrates the present utility model in conjunction with the attached drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited do not limit the present utility model.

[0034] Referring to Figures 1 to 4 as shown, Embodiment of the present utility model discloses a battery monomer, including a top cover 40 and a battery cell.

[0035] The top cover 40 is provided with a first pole column and a second pole column;

[0036] A battery cell, which has a battery cell body 10, a first tab 20 and a second tab 30. The battery cell body 10 includes a first end face 11 facing the top cover 40. The first tab 20 and the second tab 30 are both led out from the first end face of the battery cell body. The first tab 20 and the second tab 30 are arranged at intervals along a first direction.

[0037] Wherein, the first tab 20 is led out from the battery cell body 10 and bent twice, so as to obtain a first tab root 21, a first bent portion 22, a transition portion 23, a second bent portion 24 and a first connection portion 25 which are connected in sequence. Here, it is required that in a second direction, the first bent portion 22 and the second bent portion 24 are respectively located on both sides of the central plane 12 of the battery cell body 10. The central plane 12 of the battery cell body 10 and the second direction are perpendicular to each other. The first direction, the second direction and the third direction are perpendicular to each other in pairs.

[0038] The second tab 30 is led out from the battery cell 10 and bent once, so as to obtain a second tab root 31, a third bent portion 32 and a second connection portion 33 which are connected in sequence. Here, it is required that in the first direction, the first bent portion 22 of the first tab 20 and the third bent portion 32 of the second tab 30 are arranged at intervals; in the second direction, the second bent portion 24 of the first tab 20 and the third bent portion 32 of the second tab 30 are respectively located on both sides of the central plane 12 of the battery cell body 10.

[0039] The battery cell body 10 provided by the embodiment of the present utility model has a first tab 20 bent twice and a second tab 30 bent once. The second bent portion of the first tab 20 and the third bent portion of the second tab 30 are respectively located on both sides of the central plane 12 of the battery cell body 10. Correspondingly in space, the second bent portion 24 of the first tab 20 and the third bent portion 32 of the second tab 30 are respectively located below both ends of the top cover 40 along the second direction. In this way, the first tab 20 and the second tab 30 can simultaneously support both ends of the top cover 40 along the second direction, so that the top cover 40 is kept balanced, avoiding one side of the top cover 10 from being suspended, and finally avoiding the pole column on the top cover 10 from tilting, further ensuring the quality of subsequent whole-pack welding.

[0040] It should be noted that considering that after the first tab 20 is bent twice, if there is no support member to support the first tab 20, at least part of the first tab 20 is likely to be inserted into the battery cell and cause a short-circuit problem. Therefore, a first support member (not shown in the figure) is designed. The first support member is arranged between the first end face 11 of the battery cell body 10 and the transition portion 23, so that the first tab 20 can be bent for the first time around the first support member; and a second support member (not shown in the figure) is designed. The second support member is arranged between the transition portion 23 and the first connection portion 25, so that the first tab 20 can be bent for the second time around the second support member. The above-mentioned first support member and second support member can be arranged independently of each other or connected into one body.

[0041] In some embodiments of the battery cell described in the present invention, the thickness of the battery cell main body 10 in the second direction is T, and the length of the first tab 20 extending from the battery cell main body 10 is L1, where L1 = a1×T + b1, 1.5 ≤ a1 ≤ 2.5, and 0 ≤ b1 ≤ 25 mm. Designing the length of the first tab 20 with reference to the thickness value of the battery cell main body 10 is more accurate and well-founded. It can not only ensure that the second bent portion of the first tab 20 and the third bent portion of the second tab 30 are arranged on different sides after two bends, so as to support the top cover well, but also avoid waste caused by the first tab 20 being set too long and even cause safety problems.

[0042] Specifically, the value of a1 can be 1.5 or 1.7 or 1.9 or 2.1 or 2.3 or 2.5; the value of b1 can be 3 mm or 5 mm or 12 mm or 15 mm or 17 mm or 19 mm or 22 mm or 25 mm.

[0043] See Figure 4 and Figure 6 As shown in and, in some embodiments of the battery cell described in the present invention, the length of the first tab 20 extending from the battery cell main body 10 is L1, and the length of the second tab 30 extending from the battery cell main body is L2, 10 mm ≤ L1 - L2 ≤ 40 mm. Establishing the dimensional relationship between the first tab 20 and the second tab 30 facilitates determining the length L2 of the second tab 30 extending from the battery cell main body. That is to say, after the length L1 of the first tab 20 extending from the battery cell main body 10 is determined according to the thickness value of the battery cell main body 10, the length L2 of the second tab 30 extending from the battery cell main body can be obtained.

[0044] Specifically, the value of L1 - L2 can be 12 mm or 14 mm or 16 mm or 18 mm or 20 mm or 23 mm or 26 mm or 31 mm or 33 mm or 36 mm or 38 mm.

[0045] In some embodiments of the battery cell described in the present invention, the battery cell further includes a first connecting member 50 and a second connecting member 60. The first connecting portion 25 is connected to the first pole through the first connecting member 50, and the second connecting portion 33 is connected to the second pole through the second connecting member 60. Since the first tab 20 of the battery cell 10 is connected to the first pole through the first connecting member 50, and the second tab 30 of the battery cell 10 is connected to the second pole through the second connecting member 60, therefore, it is necessary to insulate and seal the first pole from the top cover 40, and / or insulate and seal the second pole from the top cover 40.

[0046] In some embodiments of the battery cell of the present invention, in order to facilitate the connection between the first tab 20 and the first connecting member 50, and to facilitate the connection between the second tab 30 and the second connecting member 60, the surfaces of the unbent first tab 20 that come into contact with the first connecting member 50 and the surfaces of the unbent second tab 30 that come into contact with the second connecting member 60 are arranged on the same side. That is to say, when the tab bending process has not been carried out, the first connecting member 50 connected to the first tab 20 and the second connecting member 60 connected to the second tab are located on the same side of the tab. As a result, after the tab bending process, when the second connecting member 60 connected to the second tab 30 can be attached to the second pole column, there is a gap between the first connecting member 50 connected to the first tab 20 and the first pole column, which is not conducive to the welding of the first connecting member 50 to the first pole column.

[0047] To this end, as shown in Figure 4 and 5 A solution proposed is that the structure of the second connecting member 60 remains unchanged and is still a conventional flat plate structure, while the structure of the first connecting member 50 is improved, including a first connecting section 51 and a second connecting section 52 arranged along the first direction. The first connecting section 51 is connected to the first pole column, and the second connecting section 52 is located between the first connecting portion 25 and the transition portion 23; in the third direction, the side surface of the second connecting section 52 facing away from the battery cell main body 10 is closer to the battery cell main body 10 than the side surface of the first connecting section 51 facing away from the battery cell main body 10. In this way, when the second connecting member 60 is attached to the second pole column, the side surface of the first connecting section 51 of the first connecting member 50 facing away from the battery cell main body 10 can also be attached to the first pole column, ensuring the connection between the first connecting member 50 and the first pole column, and also ensuring that the top cover 40 remains in a horizontal and balanced state, ultimately avoiding the inclination of the pole column on the top cover 40 and further ensuring the quality of subsequent overall package welding.

[0048] It should be noted that the specific structure of the first connecting member 50 is not limited, as long as in the third direction, the side surface of the second connecting section 52 facing away from the battery cell main body 10 is closer to the battery cell main body 10 than the side surface of the first connecting section 51 facing away from the battery cell main body 10. For example, the side surface of the first connecting member 50 that is connected to the first tab 20 can be designed to be Z-shaped, or the first connecting member 50 can be designed to be Z-shaped.

[0049] Among them, as shown in Figure 5 When the first connecting member 50 is Z-shaped, the first connecting member 50 further includes a connecting section 53 that connects the first connecting section 51 and the second connecting section 52; and as shown in Figure 6 The first connecting section 51 and the second connecting section 52 are connected, and the side surface of the first connecting section 51 that is connected to the first tab 20 is connected to the side surface of the second connecting section 52 that is connected to the first pole column through a connecting surface 54.

[0050] Further, in the third direction, the distance between the side surface of the second connecting section 52 facing away from the battery cell main body 10 and the first end face 11 of the battery cell main body 10 is H1, and the distance between the side surface of the first connecting section 51 facing away from the battery cell main body 10 and the first end face 11 of the battery cell main body 10 is H2, where 0.5 mm ≤ H2 - H1 ≤ 3.0 mm. Designing the value ranges of H1 and H2 is convenient for the fabrication of the first connecting member 50 on the one hand, and on the other hand, it also avoids the problem that the difference between H1 and H2 designed is too small to solve the problem of the gap between the first connecting member 50 and the first pole due to the influence of the first connecting portion 25 of the first tab 20. Also, it is to avoid the problem of tab reverse insertion caused by the first connecting member 50 squeezing the first tab 20 due to the difference between H1 and H2 designed being too large. Therefore, when the difference between H1 and H2 designed is within 0.5 mm to 3.0 mm, it can ensure that the first connecting member 50 is in close contact with the first pole, and can also avoid the first connecting member 50 squeezing the first tab 20.

[0051] Specifically, the value of the difference between H1 and H2 can be 0.7 mm or 1.3 mm or 1.6 mm or 1.9 mm or 2.3 mm or 2.6 mm or 2.9 mm.

[0052] See Figure 7 As shown, another solution proposed is that both the first connecting member 50 and the second connecting member 60 adopt a flat plate structure. It is designed that when the tab bending process is not carried out, the first connecting member 50 connected to the first tab 20 and the second connecting member 60 connected to the second tab 30 are located on both sides of the tab. In this way, after the tab bending process, the second connecting member 60 connected to the second tab 30 and the second pole can be in close contact, and the first connecting member 50 connected to the first tab 20 and the first pole can also be in close contact.

[0053] In some embodiments of the battery cell of the present invention, in the second direction, the maximum width of the first connecting member 50 is L3, and the thickness of the battery cell main body 10 is T, where L3 = a2 × T - b2, 0.3 ≤ a2 ≤ 1.0, 1 mm ≤ b2 ≤ 5 mm. Designing the maximum width of the first connecting member 50 with reference to the thickness value of the battery cell main body 10 is more accurate and well-founded. A first connecting member with a certain width not only ensures its own strength but also ensures that it has sufficient area for connecting to the top cover, thereby ensuring the connection strength between the first connecting member and the top cover.

[0054] Specifically, the value of a2 can be 0.5 or 0.7 or 0.8; the value of b2 can be 2 mm or 3 mm or 4 mm.

[0055] In some embodiments of the battery cell according to the present invention, in the third direction, one side of the second connecting portion 33 facing away from the battery cell main body 10 is in contact with the second connecting member 60, and a first insulating adhesive is provided on one side of the second connecting portion 33 facing the battery cell main body 10. The first insulating adhesive covers the first welding mark formed by welding the second connecting portion 33 and the second connecting member 60.

[0056] In the third direction, one side of the first connecting portion 25 facing the battery cell main body 10 is in contact with the first connecting member 50, and a second insulating adhesive is provided on one side of the first connecting portion 25 facing away from the battery cell main body 10. The second insulating adhesive covers the second welding mark formed by welding the first connecting portion 25 and the first connecting member 50.

[0057] The provision of the first insulating adhesive and the second insulating adhesive avoids the problem of slag falling off from the welding marks and causing safety issues.

[0058] An embodiment of the present utility model also discloses an electrical device including the above battery. It has the same technical effects as the above battery and will not be elaborated here.

[0059] Obviously, the above embodiments are merely examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. The obvious changes or modifications derived therefrom still fall within the protection scope of the present utility model.

Claims

1. A battery cell, characterized in that: include, A top cover (40) on which a first pole and a second pole are arranged; A battery cell, comprising a battery cell body (10), a first pole lug (20) and a second pole lug (30), wherein the battery cell body (10) comprises a first end surface (11) disposed toward the top cover (40), and the first pole lug (20) and the second pole lug (30) are both led out from the first end surface of the battery cell body; The first pole lug (20) includes a first bending portion (22) and a second bending portion (24), and the second pole lug (30) includes a third bending portion (32); in a first direction, the first bending portion (22) of the first pole lug (20) and the third bending portion (32) of the second pole lug (30) are arranged at intervals; in a second direction, the second bending portion of the first pole lug (20) and the third bending portion (32) of the second pole lug (30) are respectively located on both sides of a center plane of the battery cell body (10), the center plane of the battery cell body and the second direction are perpendicular to each other, and the first direction and the second direction are perpendicular to each other.

2. The battery cell according to claim 1, characterized in that: The first pole lug (20) further comprises a first connecting portion (25); an end of the second bent portion (24) away from the battery cell body (10) is connected to the first connecting portion (25); the first connecting portion (25) is connected to the first pole via a first connecting member (50); The second pole lug (30) further comprises a second connecting portion (33); an end of the third bent portion (32) away from the battery cell body (10) is connected to the second connecting portion (33); and the second connecting portion (33) is connected to the second pole via a second connecting member (60).

3. The battery cell according to claim 2, characterized in that: In the second direction, the maximum width of the first connecting member (50) is L3, and the thickness of the battery cell body is T, wherein L3=a2×T-b2, 0.3≤a2≤1.0, 1mm≤b2≤5mm.

4. The battery cell according to claim 2, characterized in that: The first connecting member (50) comprises a first connecting section (51) and a second connecting section (52); the first pole lug (20) further comprises a transition portion (23); the transition portion (23) connects the second bending portion (24) and the first bending portion (22); the first connecting section (51) connects the first pole; the second connecting section (52) is located between the first connecting section (25) and the transition portion (23); in a third direction, a side surface of the second connecting section (52) facing away from the battery cell body (10) is closer to the battery cell body (10) than a side surface of the first connecting section (51) facing away from the battery cell body (10); the third direction and the second direction are perpendicular to each other.

5. The battery cell according to claim 4, characterized in that: In the third direction, the distance between a side surface of the second connecting section (52) facing away from the battery cell body (10) and the first end surface of the battery cell body (10) is H1, and the distance between a side surface of the first connecting section (51) facing away from the battery cell body (10) and the first end surface of the battery cell body (10) is H2, wherein 0.5 mm ≤ H2 - H1 ≤ 3.0 mm.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The length of the first pole tab (20) led out from the battery cell body (10) is L1, the length of the second pole tab (30) led out from the battery cell body is L2, and 10 mm ≤ L1-L2 ≤ 40 mm.

7. The battery cell according to claim 6, characterized in that: The thickness of the battery cell body (10) in the second direction is T, wherein L1=a1×T+b1, 1.5≤a1≤2.5, 0≤b1≤25 mm.

8. The battery cell according to any one of claims 2 to 5, characterized in that: In the third direction, a side of the second connecting portion (33) facing away from the battery cell body (10) contacts the second connecting piece (60), and a side of the second connecting portion (33) facing the battery cell body (10) is provided with a first insulating adhesive, the first insulating adhesive covering a first weld mark formed by welding the second connecting portion (33) and the second connecting piece (60).

9. The battery cell according to any one of claims 2 to 5, characterized in that: In the third direction, the first connecting portion (25) contacts the first connecting piece (50) on a side facing the battery cell body (10), and a second insulating adhesive is provided on a side of the first connecting portion (25) facing away from the battery cell body (10), wherein the second insulating adhesive covers a second weld mark formed by welding the first connecting portion (25) and the first connecting piece (50).

10. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 9.

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