Battery, battery pack and electric equipment

Abstract

The utility model relates to a battery, a battery pack and electric equipment, the battery comprises a pole core, a bottom shell for accommodating the pole core, a cover plate covering the bottom shell and an insulator arranged in the bottom shell, the pole core comprises a pole lug, a lead-out sheet is arranged on the pole lug, the insulator comprises a first insulating part for electrically isolating the leading-out sheet from the cover plate and a second insulating part for electrically isolating the tab from the bottom shell, a first matching structure is arranged on the first insulating part, and a second matching structure suitable for being jointed with the first matching structure is arranged on the second insulating part. According to the technical scheme, the first insulating part and the second insulating part can form a mutually fixed whole, the first insulating part and the second insulating part can be mutually limited, after the battery is used for a long time, the first insulating part and the second insulating part do not move in the battery, and the service life of the battery is prolonged. And the electric isolation effect between the lead-out sheet and the cover plate and between the tab and the bottom shell is not influenced.

Description

Technical Field

[0001] The present disclosure relates to the field of batteries, and more particularly, to a battery, a battery pack, and an electrical device. Background Art

[0002] A battery is a device that can convert chemical energy into electrical energy, and generally includes a lead-out piece, a tab, and a battery case. When the battery is in use, in order to prevent the current on the lead-out piece and the tab from flowing to the battery case and causing a short circuit of the battery, a plurality of insulating members need to be provided inside the battery case to electrically isolate the lead-out piece from the battery case and the tab from the battery case. After the battery is used for a long time, the internal insulating members will move, affecting the electrical isolation effect between the lead-out piece and the battery case and between the tab and the battery case. Summary of the Utility Model

[0003] An object of the present disclosure is to provide a battery, a battery pack, and an electrical device to solve the problem that a plurality of insulating members move in the related art.

[0004] To achieve the above object, a first object of the present disclosure provides a battery, including a core, a bottom case for accommodating the core, a cover plate covering the bottom case, and an insulator disposed in the bottom case, the core includes a tab, and a lead-out piece is disposed on the tab, wherein,

[0005] The insulator includes a first insulating member for electrically isolating the lead-out piece and the cover plate and a second insulating member for electrically isolating the tab and the bottom case, a first mating structure is provided on the first insulating member, and a second mating structure adapted to engage with the first mating structure is provided on the second insulating member.

[0006] Optionally, the first insulating member includes a first barrier sheet disposed on the surface of the cover plate facing the lead-out piece, and the second insulating member includes a second barrier sheet disposed on the surface of the bottom case facing the tab.

[0007] Optionally, the second insulating member includes two isolation blocks connected to both sides of the second barrier sheet, and the first barrier sheet is disposed between the two isolation blocks,

[0008] Wherein, the first mating structure includes a notch formed at the edge of the first barrier sheet, and the second mating structure includes a convex edge disposed on the inner side of the isolation block, and the convex edge is embedded into the notch.

[0009] Optionally, the notch is formed on the surface of the first barrier sheet close to the cover plate, and is located at the ends of the first barrier sheet in the first direction and the second direction, and the convex edge is clamped between the first barrier sheet and the cover plate,

[0010] Wherein, the first direction is the length direction of the cover plate, and the second direction is the width direction of the cover plate.

[0011] Optionally, the mating surfaces of the notch and the convex edge are respectively arc-shaped surfaces.

[0012] Optionally, in the first direction, the maximum dimension of the convex edge and the maximum dimension of the notch satisfy: 0.5 ≤ / ≤ 1.

[0013] Optionally, in the second direction, the maximum dimension of the convex edge and the maximum dimension of the notch satisfy: 0.5 ≤ / ≤ 1.

[0014] Optionally, the lead-out piece includes:

[0015] A first contact plate in surface contact with the tab;

[0016] A second contact plate disposed opposite to the first contact plate; and

[0017] A third contact plate connected to the first contact plate and the second contact plate respectively.

[0018] Optionally, the first insulating member further includes a third barrier sheet, and the third barrier sheet is connected to the first barrier sheet and covers the surface of the third contact plate facing the electrode core.

[0019] Optionally, the second insulating member further includes a fourth barrier sheet and a fifth barrier sheet connecting the fourth barrier sheet to the second barrier sheet. The second barrier sheet, the fifth barrier sheet, and the fourth barrier sheet form a C-shaped structure, and the first contact plate and the tab extend into the inner side of the C-shaped structure.

[0020] Optionally, in the length direction of the cover plate, the maximum dimension of the second contact plate and the maximum dimension of the first barrier sheet satisfy: ≤ 80 mm, 0.6 ≤ / ≤ 0.95.

[0021] Optionally, in the length direction of the cover plate, the maximum dimension of the first contact plate and the maximum dimension of the first contact plate satisfy: ≤80 mm, 0.5 ≤ / ≤0.9.

[0022] Optionally, in the length direction of the cover plate, the maximum size of the first contact plate and the maximum size of the tab satisfy: 0.4 ≤ / ≤0.9.

[0023] Optionally, it includes a terminal assembly, the terminal assembly is connected to the lead-out piece and protrudes from the cover plate, and the bottom case is provided with a recess for avoiding the terminal assembly of another battery when the battery is stacked on another battery.

[0024] Optionally, in the width direction of the bottom case, the recess penetrates through the bottom case.

[0025] Optionally, the terminal assembly and the recess are respectively arranged at the ends of the battery in the length direction.

[0026] Optionally, the terminal assembly includes a positive terminal assembly and a negative terminal assembly, and a first recess corresponding to the positive terminal assembly and a second recess corresponding to the negative terminal assembly are formed on the bottom case.

[0027] The second object of the present disclosure is to provide a battery pack including the battery according to any one of the above.

[0028] The third object of the present disclosure is to provide an electrical device including the battery pack described above.

[0029] Through the above technical solutions, through the first fitting structure and the second fitting structure, the first insulating part and the second insulating part can be fitted and connected to each other, the first insulating part and the second insulating part can form an integral body that is fixed to each other, the first insulating part and the second insulating part can be limited to each other, and after the battery is used for a long time, the first insulating part and the second insulating part will not move around inside the battery, and will not affect the electrical insulation effect between the lead-out piece and the cover plate and between the tab and the bottom case.

[0030] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation part. Description of the Drawings

[0031] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification, and are used to explain the present disclosure together with the following specific implementation manners, but do not constitute a limitation to the present disclosure. In the drawings:

[0032] Figure 1It is a schematic structural diagram of a battery provided by an exemplary embodiment of the present disclosure;

[0033] Figure 2 is Figure 1 an enlarged view of part A in

[0034] Figure 3 It is a sectional view of a battery provided by an exemplary embodiment of the present disclosure;

[0035] Figure 4 is Figure 3 an enlarged view of part B in

[0036] Figure 5 is Figure 3 an enlarged view of part C in

[0037] Figure 6 It is a schematic structural diagram of a first insulating member, a second insulating member and a lead-out sheet provided by an exemplary embodiment of the present disclosure;

[0038] Figure 7 It is a top view of a first insulating member and a second insulating member provided by an exemplary embodiment of the present disclosure;

[0039] Figure 8 It is a schematic structural diagram of a first insulating member and a second insulating member provided by an exemplary embodiment of the present disclosure, wherein the first mating structure and the second mating structure are matingly connected to each other;

[0040] Figure 9 It is a schematic structural diagram of a second insulating member provided by an exemplary embodiment of the present disclosure.

[0041] Description of Reference Numerals

[0042] 100 - electrode core, 101 - tab, 200 - bottom case, 201 - pit, 210 - first pit, 220 - second pit, 300 - cover plate, 400 - lead - out sheet, 401 - first contact plate, 402 - second contact plate, 403 - third contact plate, 500 - first insulating member, 501 - first mating structure, 5011 - notch, 502 - first barrier sheet, 503 - third barrier sheet, 600 - second insulating member, 601 - second mating structure, 6011 - convex edge, 602 - second barrier sheet, 603 - isolation block, 604 - fourth barrier sheet, 605 - fifth barrier sheet, 700 - terminal assembly, 710 - positive terminal assembly, 720 - negative terminal assembly. Detailed Embodiments

[0043] The following describes the detailed embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the detailed embodiments described herein are only for the purpose of illustration and explanation of the present disclosure, and are not intended to limit the present disclosure.

[0044] In the present disclosure, unless otherwise stated, the orientation terms used generally refer to the orientation of the relevant components in the actual use state. "Inside and outside" may refer to the inside and outside of the contour of the corresponding component or its inside or outside in the environment where it is located according to the specific context. For example, the inner side of the following isolation block 603 refers to the side facing the electrode core 100, and the inner side of the C-shaped structure refers to the inner side surface of its own contour. In addition, when the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The terms "first", "second", etc. used in the present disclosure are used to distinguish one element from another element and do not have sequentiality and importance.

[0045] As Figures 1 to 9 shown, the present disclosure provides a battery, including an electrode core 100, a bottom case 200 for accommodating the electrode core 100, a cover plate 300 covering the bottom case 200, and an insulator disposed in the bottom case 200. The electrode core 100 includes an electrode tab 101, and a lead-out piece 400 is disposed on the electrode tab 101. Among them, the insulator includes a first insulating member 500 for electrically isolating the lead-out piece 400 and the cover plate 300 and a second insulating member 600 for electrically isolating the electrode tab 101 and the bottom case 200. A first mating structure 501 is disposed on the first insulating member 500, and a second mating structure 601 adapted to engage with the first mating structure 501 is disposed on the second insulating member 600.

[0046] Through the above technical solution, through the first mating structure 501 and the second mating structure 601, the first insulating member 500 and the second insulating member 600 can be mutually mated and connected. The first insulating member 500 and the second insulating member 600 can form an integrally fixed whole. The first insulating member 500 and the second insulating member 600 can limit each other. After the battery is used for a long time, the first insulating member 500 and the second insulating member 600 will not move around inside the battery, and will not affect the electrical isolation effect between the lead-out piece 400 and the cover plate 300 and between the electrode tab 101 and the bottom case 200.

[0047] The first insulating member 500 may include a first barrier sheet 502 disposed on the surface of the cover plate 300 facing the lead-out piece 400, and the second insulating member 600 may include a first contact plate 401 disposed on the surface of the bottom case 200 facing the electrode tab 101. In this way, the first barrier sheet 502 is disposed between the cover plate 300 and the lead-out piece 400 to ensure electrical isolation between the lead-out piece 400 and the cover plate 300, and the first contact plate 401 is disposed between the bottom case 200 and the electrode tab 101 to ensure electrical isolation between the surface of the electrode tab 101 and the bottom case 200.

[0048] In some embodiments, the second insulating member 600 may include two isolation blocks 603 connected to both sides of the second barrier sheet 602. The first barrier sheet 502 is disposed between the two isolation blocks 603. Among them, the first mating structure 501 includes a notch 5011 formed at the edge of the first barrier sheet 502, and the second mating structure 601 includes a flange 6011 disposed on the inner side of the isolation block 603. The flange 6011 is embedded into the notch 5011. Refer to Figure 1 and Figure 2 , the outer sides of the two isolation blocks 603 can directly abut against the bottom case 200, and the isolation blocks 603 are limited by the bottom case 200 to further limit the first contact plate 401 to ensure the stability of the first contact plate 401. The isolation blocks 603 can also protect both sides of the tab 101, so that both sides of the tab 101 will not contact the bottom case 200. At the same time, the isolation blocks 603 can also protect both sides of the lead-out piece 400, so that both sides of the lead-out piece 400 will not contact the bottom case 200. The edges of the first barrier sheet 502 facing the two isolation blocks 603 can abut against the isolation blocks 603, so that the two isolation blocks 603 can also limit the first barrier sheet 502. If the flange 6011 is directly disposed on the first contact plate 401, then the flange 6011 and the notch 5011 cannot be fitted and connected due to the height difference. By disposing the flange 6011 on the inner side of the isolation block 603, the flange 6011 and the notch 5011 overcome the height difference, and the first insulating member 500 and the second insulating member 600 can be fitted and connected through the notch 5011 and the flange 6011.

[0049] The notch 5011 can be formed on the surface of the first barrier sheet 502 close to the cover plate 300, and is located at the end of the first barrier sheet 502 in the first direction and the second direction. The flange 6011 is clamped between the first barrier sheet 502 and the cover plate 300, where the first direction is the length direction of the cover plate 300, and the second direction is the width direction of the cover plate 300. Specifically, refer to Figure 7 , Figure 7 is a top view of the first insulating member 500 and the second insulating member 600. Taking the Figure 7 drawing direction as a reference, Figure 7 the left-right direction in the drawing direction is the length direction of the cover plate 300, Figure 7 and the up-down direction in the drawing direction is the width direction of the cover plate 300. The notch 5011 is located at the end of the first barrier sheet 502 in the first direction and the second direction. The notch 5011, and at the same time, the flange 6011 on the isolation block 603 will also be correspondingly disposed at the end of the isolation block 603 in the first direction and the second direction. In this way, the notch 5011 and the flange 6011 will form a positioning reference. Refer to Figures 6 to 9, the first insulating member 500 moves along the first direction, and the second matching structure 601 (i.e., the convex edge 6011) on the second insulating member 600 can limit the first insulating member 500 by connecting with the first matching structure 501 (i.e., the notch 5011), thereby ensuring the installation position of the first insulating member 500 and the second insulating member 600. Figure 7 For reference, when the cover plate 300 and the bottom shell 200 are installed with each other, the first insulating member 500 and the second insulating member 600 will move relative to each other in the first direction. During the installation of the cover plate 300 and the bottom shell 200, the convex edge 6011 on the second insulating member 600 will not be interfered by the first blocking piece 502. Only when the first insulating member 500 and the second insulating member 600 are installed in place, the convex edge 6011 and the notch 5011 will be connected with each other. At the same time, the convex edge 6011 is sandwiched between the first blocking piece 502 and the cover plate 300, so that the first blocking piece 502 and the cover plate 300 fix the position of the convex edge 6011, and further fix the position of the second insulating member 600, so that the convex edge 6011 is less likely to be separated from the notch 5011, and the position of the second insulating member 600 is more stable.

[0050] The matching surfaces of the notch 5011 and the convex edge 6011 can be arcuate surfaces. Compared with straight edges, the arcuate surface can disperse stress more evenly, reduce stress concentration, and reduce the risk of fatigue and damage of the convex edge 6011 and the notch 5011. At the same time, the matching of the arcuate surface reduces the contact of sharp angles, and the notch 5011 and the convex edge 6011 are in closer contact. The arcuate surface can also reduce the wear between the convex edge 6011 and the notch 5011 during long-term use of the battery, thereby extending the service life of the convex edge 6011 and the notch 5011.

[0051] In the present disclosure, the first mating structure 501 and the second mating structure 601 may be structures such as snap-fit ​​and slots or plug-in rods and slots in addition to the notches 5011 and the protrusions 6011 mentioned above. In the present disclosure, there is no specific limitation on the specific structures of the first mating structure 501 and the second mating structure 601, nor on the setting positions of the first mating structure 501 and the second mating structure 601, as long as the first mating structure 501 and the second mating structure 601 can be mated and connected with each other.

[0052] It should be explained that in the actual design and production of the battery, the first matching structure 501 and the second matching structure 601 may be designed into various shapes. At the same time, the second contact plate 402, the first barrier sheet 502, the first contact plate 401, the first contact plate 401 and the tab 101 mentioned below may also be designed into various shapes. , , , , , , , and The dimensions represented by, unless otherwise specified, refer to the maximum dimensions of the corresponding structures in the corresponding directions. For example, represents the maximum dimension of the convex edge 6011 in the length direction of the cover plate 300, represents the maximum dimension of the first barrier sheet 502 in the length direction of the cover plate 300.

[0053] In some embodiments, in the first direction, the maximum dimension of the convex edge 6011 and the maximum dimension of the notch 5011 can satisfy: 0.5 ≤ / ≤ 1. Specifically, refer to Figure 7 , the maximum dimension of the convex edge 6011 is less than the maximum dimension of the notch 5011 , ensuring that the convex edge 6011 and the notch 5011 do not interfere with each other in the first direction. At the same time, the maximum dimension of the convex edge 6011 is greater than or equal to 0.5 times the maximum dimension of the notch 5011 , ensuring that the convex edge 6011 and the notch 5011 have sufficient contact area in the first direction to ensure the effect of preventing the insulation part from moving around of the first mating structure 501 and the second mating structure 601.

[0054] In the second direction, the maximum dimension of the convex edge 6011 and the maximum dimension of the notch 5011 can satisfy: 0.5 ≤ / ≤ 1. Specifically, refer to Figure 7 , the maximum dimension of the convex edge 6011 is less than the maximum dimension of the notch 5011 , ensuring that the convex edge 6011 and the notch 5011 do not interfere with each other in the second direction. At the same time, the maximum dimension of the convex edge 6011 is greater than or equal to 0.5 times the maximum dimension of the notch 5011 , ensuring that the convex edge 6011 and the notch 5011 have sufficient contact area in the second direction to ensure the effect of preventing the insulation part from moving around of the first mating structure 501 and the second mating structure 601.

[0055] Refer to Figures 2 to 5, the lead-out piece 400 may include a first contact plate 401, a second contact plate 402, and a third contact plate 403. Among them, the first contact plate 401 is in surface contact with the tab 101; the second contact plate 402 is disposed opposite to the first contact plate 401; the third contact plate 403 is connected to the first contact plate 401 and the second contact plate 402 respectively. That is, the lead-out piece can be configured in a U shape. In the present disclosure, the second contact plate 402 may be in contact with the terminal assembly 700, and the terminal assembly 700 is an interface between the internal electrochemical system of the battery and the external circuit. Through the lead-out piece 400, electrical energy can be transmitted to the external circuit connection through the tab 101, the lead-out piece 400, and the terminal, realizing the conversion and transmission of energy. The lead-out piece 400 configured in a U shape can provide a large contact area, and ensure the over-current capacity through the surface contact between the first contact plate 401 and the tab 101 and through the contact between the second contact plate 402 and the terminal assembly 700. It should be noted here that although the terminal assembly 700 shown in the drawings is only placed on the surface of the cover plate 300, in the actual structure, the terminal assembly 700 is accommodated in the bottom case 200, is connected to the lead-out piece 400, and protrudes from the cover plate 300 to be connected to the external structure. Among them, the first insulating member 500 and the cover plate 300 may have channels for the terminal assembly 700 to pass through, and the specific structure thereof will not be elaborated here.

[0056] The above U-shaped design can increase the mechanical strength of the lead-out piece 400, making it not easily deformed or broken during the assembly and use of the battery, thereby improving the reliability and service life of the battery. And compared with other lead-out pieces 400 with complex shapes, the U-shaped lead-out piece 400 has a simpler manufacturing process and lower cost. In order to prevent the first contact plate 401 from detaching from the tab 101 due to shaking during the use of the battery, the first contact plate 401 and the tab 101 can be welded on the basis of surface contact. The opening of the U-shaped lead-out piece 400 usually faces away from the electrode core 100, which is convenient for the operator to weld the first contact plate 401 and the tab 101.

[0057] The first insulating member 500 may further include a third barrier sheet 503, and the third barrier sheet 503 is connected to the first barrier sheet 502 and covers the surface of the third contact plate 403 facing the electrode core 100. Refer to Figure 4 , the third barrier sheet 503 may be disposed below the first barrier surface and connected to the first barrier sheet 502, so that the third barrier sheet 503 covers the surface of the third contact plate 403 facing the electrode core 100. In this way, the third barrier sheet 503 can be disposed between the third contact plate 403 and the electrode core 100 to prevent the third contact plate 403 from contacting the electrode core 100 and causing a short circuit of the battery.

[0058] Refer to Figure 4 and Figure 5 andFigure 9 , the second insulating member 600 may further include a fourth barrier sheet 604 and a fifth barrier sheet 605 connecting the fourth barrier sheet 604 to the second barrier sheet 602. The second barrier sheet 602, the fifth barrier sheet 605, and the fourth barrier sheet 604 form a C-shaped structure, and the first contact plate 401 and the tab 101 extend into the inner side of the C-shaped structure. Refer to Figure 4 and Figure 5 , the fourth barrier sheet 604 may cover a side of the tab 101 facing the bottom case 200, and the fifth barrier sheet 605 may cover a side of the tab 101 facing the cover plate 300. The fourth barrier sheet 604 and the fifth barrier sheet 605 are respectively connected to the first contact plate 401. Further refer to Figure 4 and taking Figure 4 the drawing direction as an example, the tab 101 has a certain thickness. At this time, a side of the end of the tab 101 facing the bottom case 200 is formed. The fifth barrier sheet 605 covers the end of the tab 101, so that the side of the end of the tab 101 facing the bottom case 200 is insulated from the bottom case 200. The fifth barrier sheet 605 ensures insulation between the tab 101 and the cover plate 300. The first contact plate 401 covers a side of the tab 101 facing the cover plate 300, and the second contact plate 402 is disposed on the cover plate 300. At this time, the fifth barrier sheet 605 may cover the first contact plate 401, and by ensuring insulation between the first contact plate 401 and the second contact plate 402, insulation between the tab 101 and the cover plate 300 is ensured. The inner side of the C-shaped structure is formed by the second barrier sheet 602, the fifth barrier sheet 605, and the fourth barrier sheet 604, and a receiving space is formed. The first contact plate 401 and the tab 101 can be accommodated in the receiving space. The second barrier sheet 602, the fifth barrier sheet 605, and the fourth barrier sheet 604 can enclose the tab 101 and the first contact plate 401, which can prevent the tab 101 and the first contact plate 401 from being electrically connected to the bottom case 200 and the cover plate 300 when they are displaced due to shaking during use.

[0059] In some embodiments, in the length direction of the cover plate 300, that is, in the first direction, the maximum dimension of the second contact plate 402 and the maximum dimension of the first barrier sheet 502 may satisfy: ≤80mm, 0.6≤ / ≤0.95. In this way, while ensuring the insulation effect of the first barrier sheet 502, the first barrier sheet 502 occupies a smaller space inside the battery, maximizing the remaining space inside the battery, providing more electrolyte storage space, and leaving more exhaust space for the battery. When thermal runaway occurs in the battery, the molten material of the first barrier sheet 502 has a small volume and can be quickly discharged outside the battery, avoiding the blockage of the battery exhaust port by the molten material of the first barrier sheet 502 and preventing phenomena such as fire or explosion of the battery, ensuring the liquid storage space and safety of the battery. If the maximum size of the first barrier sheet 502 is greater than 80 mm, the first barrier sheet 502 will occupy too much space inside the battery. If the maximum size of the second contact plate 402 is less than 0.6 times the maximum size of the first barrier sheet 502 , it means that the difference between the maximum size of the first barrier sheet 502 and the maximum size of the second contact plate 402 is too large, and part of the insulation effect of the first barrier sheet 502 is wasted. It is necessary to reduce the maximum size of the first barrier sheet 502 and reduce the space occupied by the first barrier sheet 502 inside the battery. If the maximum size of the second contact plate 402 is greater than 0.95 times the maximum size of the first barrier sheet 502 , it means that the maximum size of the first barrier sheet 502 and the maximum size of the second contact plate 402 are too close, and it is difficult to ensure the insulation effect of the first barrier sheet 502. It is necessary to increase the maximum size of the first barrier sheet 502.

[0060] In the length direction of the cover plate 300, that is, in the first direction, the maximum size of the first contact plate 401 and the maximum size of the first contact plate 401 can satisfy: ≤80 mm, 0.5 ≤ / ≤0.9. In this way, while ensuring the insulation effect of the first contact plate 401, the first contact plate 401 occupies a smaller space inside the battery, maximizing the remaining space inside the battery, providing more electrolyte storage space, and leaving more exhaust space for the battery. When thermal runaway occurs in the battery, the molten material of the first contact plate 401 has a small volume and can be quickly discharged outside the battery, avoiding the blockage of the battery exhaust port by the molten material of the first contact plate 401 and preventing phenomena such as fire or explosion of the battery, ensuring the liquid storage space and safety of the battery. If the maximum size of the first contact plate 401 is greater than 80 mm, the first contact plate 401 will occupy too much space inside the battery. If the maximum size of the first contact plate 401 is less than 0.5 times the maximum size of the first contact plate 401 , indicating that the maximum size of the first contact plate 401 and the maximum size of the first contact plate 401 have a large difference, that is, the maximum size of the contact surface between the first contact plate 401 and the tab 101 in the first direction and the maximum size of the first contact plate 401 have a large difference, and the insulation effect of the first contact plate 401 is partially wasted, and the maximum size of the first contact plate 401 needs to be reduced. If the maximum size of the first contact plate 401 is Greater than 0.9 times the maximum dimension of the first contact plate 401 That is, the maximum size of the contact surface between the first contact plate 401 and the tab 101 in the first direction is too close to the maximum size of the first contact plate 401 , and the insulation effect of the first contact plate 401 is insufficient, and the maximum size of the first contact plate 401 needs to be increased.

[0061] In the length direction of the cover plate 300, that is, in the first direction, the maximum dimension of the first contact plate 401 is Maximum size with tab 101 Can meet: 0.4≤ / ≤0.9. Ensure that there is sufficient contact area between the first contact plate 401 and the pole lug 101 to ensure the flow effect. When the first contact plate 401 and the pole lug 101 are welded, the welding strength between the first contact plate 401 and the pole lug 101 can also be ensured. If the maximum size of the first contact plate 401 is Less than 0.4 times the maximum dimension of the tab 101 , indicating that the maximum size of the contact surface between the first contact plate 401 and the tab 101 in the first direction is too small, and there is not enough contact area between the first contact plate 401 and the tab 101, which affects the above-mentioned flow effect and welding strength. It is necessary to increase the maximum size of the first contact plate 401 in the first direction. If the maximum size of the first contact plate 401 is Greater than 0.9 times the maximum dimension of the tab 101 , indicating that the first contact plate 401 is too long and too close to the pole core 100, the pole core 100 and the first contact plate 401 are easily in contact and cause a short circuit in the battery. At the same time, the overly long first contact plate 401 also increases the length of the second barrier sheet 602, the second contact plate 402 and the first barrier sheet 502 in disguised form, further reducing the space in the battery.

[0062] In addition, refer to Figures 3 to 5 The pole assembly 700 protrudes from the cover plate 300, and the bottom shell 200 is provided with a pit 201, which is used to avoid the pole assembly 700 of another battery when the battery is stacked on another battery. In this way, the two batteries can be stacked together, the pole assembly 700 no longer occupies the installation space of the battery, and the space utilization rate is better.

[0063] According to some embodiments, in the width direction of the bottom case 200 (i.e., the second direction described above), the pit 201 may penetrate through the bottom case 200. That is, in the second direction, the size of the pit 201 is equal to the overall size of the bottom case 200. The penetrating pit 201 does not affect the arrangement of the electrical components inside the battery and is also more convenient for the processing of the pit 201 itself.

[0064] According to some embodiments, the terminal assembly 700 and the pit 201 are respectively arranged at the ends in the length direction of the battery (i.e., the first direction described above). In this way, after the batteries are stacked, it is easier for the external conductor to be electrically connected to the terminal assembly 700, and it is also easier to connect the terminal assemblies 700 between adjacent batteries.

[0065] In addition, with reference to Figure 3 , the terminal assembly 700 includes a positive terminal assembly 710 and a negative terminal assembly 720. A first pit 210 corresponding to the positive terminal assembly 710 and a second pit 220 corresponding to the negative terminal assembly 720 are formed on the bottom case 200. Among them, the positive terminal assembly 710 and the first pit 210 are located at one end of the battery, and the negative terminal assembly 720 and the second pit 220 are located at the other end of the battery.

[0066] According to the second aspect of the present disclosure, there is also provided a battery pack, including the battery in any of the above embodiments and having all its beneficial effects, which will not be elaborated here.

[0067] According to the third aspect of the present disclosure, there is also provided an electrical device, including the above battery pack and having all its beneficial effects, which will not be elaborated here. The present disclosure does not limit the specific type of the electrical device, and it may be, for example, an electric vehicle.

[0068] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0069] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0070] Furthermore, any combination can be made between various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A battery, characterized in that: The invention comprises a pole core, a bottom shell for accommodating the pole core, a cover plate arranged on the bottom shell, and an insulator arranged in the bottom shell, wherein the pole core comprises a pole ear, and a lead sheet is arranged on the pole ear, wherein: The insulator includes a first insulating member for electrically isolating the lead-out plate and the cover plate and a second insulating member for electrically isolating the pole ear and the bottom shell. The first insulating member is provided with a first matching structure, and the second insulating member is provided with a second matching structure suitable for engaging with the first matching structure.

2. The battery according to claim 1, characterized in that The first insulating member includes a first barrier sheet disposed on a surface of the cover plate facing the lead-out sheet, and the second insulating member includes a second barrier sheet disposed on a surface of the bottom shell facing the tab.

3. The battery according to claim 2, characterized in that The second insulating member includes two isolation blocks connected to both sides of the second barrier sheet, and the first barrier sheet is arranged between the two isolation blocks. The first matching structure includes a notch opened at the edge of the first barrier sheet, and the second matching structure includes a convex edge arranged on the inner side of the isolation block, and the convex edge is embedded in the notch.

4. The battery according to claim 3, characterized in that The notch is formed on the surface of the first barrier sheet close to the cover plate and is located at the end of the first barrier sheet in the first direction and the end of the second direction. The convex edge is sandwiched between the first barrier sheet and the cover plate. The first direction is the length direction of the cover plate, and the second direction is the width direction of the cover plate.

5. The battery according to claim 4, characterized in that The matching surfaces of the notch and the convex edge are arc-shaped surfaces respectively.

6. The battery according to claim 5, characterized in that In the first direction, the maximum dimension of the convex edge The maximum size of the notch Satisfaction: 0.5 ≤ / ≤1.

7. The battery according to claim 5, characterized in that In the second direction, the maximum dimension of the convex edge The maximum size of the notch Satisfaction: 0.5 ≤ / ≤1.

8. The battery according to claim 2, characterized in that The lead-out sheet comprises: A first contact plate, in contact with the tab surface; a second contact plate, disposed opposite to the first contact plate; and The third contact plate is connected to the first contact plate and the second contact plate respectively.

9. The battery according to claim 8, characterized in that The first insulating member further includes a third barrier sheet, which is connected to the first barrier sheet and covers the surface of the third contact plate facing the pole core.

10. The battery according to claim 8, characterized in that The second insulating member further includes a fourth barrier sheet and a fifth barrier sheet connecting the fourth barrier sheet to the second barrier sheet, The second barrier sheet, the fifth barrier sheet, and the fourth barrier sheet form a C-shaped structure, and the first contact plate and the tab extend into the inner side of the C-shaped structure.

11. The battery according to claim 8, characterized in that In the length direction of the cover plate, the maximum size of the second contact plate The maximum dimension of the first barrier piece satisfy: ≤80mm, 0.6≤ / ≤0.

95.

12. The battery according to claim 8, characterized in that In the length direction of the cover plate, the maximum size of the first contact plate The maximum dimension of the second barrier sheet satisfy: ≤80mm, 0.5≤ / ≤0.

9.

13. The battery according to claim 8, characterized in that In the length direction of the cover plate, the maximum size of the first contact plate The maximum size of the lug Satisfaction: 0.4 ≤ / ≤0.

9.

14. The battery according to any one of claims 1 to 13, characterized in that It comprises a pole assembly, which is connected to the lead-out piece and protrudes from the cover plate. The bottom shell is provided with a pit for avoiding the pole assembly of another battery when the battery is stacked on another battery.

15. The battery according to claim 14, characterized in that The recess penetrates the bottom shell in a width direction of the bottom shell.

16. The battery according to claim 14, characterized in that The pole assembly and the recess are respectively arranged at the ends of the battery in the length direction.

17. The battery according to claim 14, characterized in that The pole assembly includes a positive pole assembly and a negative pole assembly, and a first recess corresponding to the positive pole assembly and a second recess corresponding to the negative pole assembly are formed on the bottom shell.

18. A battery pack, characterized in that: A battery comprising any one of claims 1 to 17.

19. An electrical equipment, characterized in that: Comprising the battery pack described in claim 18.

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