Battery, battery pack and electric device

Abstract

Provided are a battery, a battery pack and an electric device. The battery comprises: a core; a bottom shell, which accommodates the core; a cover plate, which is arranged on the bottom shell in a covering manner; and an insulator, which is arranged in the bottom shell, wherein the core comprises a tab, and a lead-out piece is provided on the tab; and the insulator comprises a first insulating member for electrically isolating the lead-out piece from the cover plate, and a second insulating member for electrically isolating the tab from the bottom shell, the first insulating member being provided with a first mating structure, and the second insulating member being provided with a second mating structure that engages with the first mating structure.

Description

Battery, battery pack and electric device

[0001] Cross Reference to Related Applications

[0002] This application claims priority to the Chinese patent application No. 202421846715.4, filed on July 31, 2024, and entitled "Battery, battery pack and electric device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the field of battery, in particular, to a battery, a battery pack and an electric device. BACKGROUND

[0004] A battery is a device capable of converting chemical energy into electrical energy, which usually includes a lead-out sheet, a tab and a battery shell. In order to avoid the current on the lead-out sheet and the tab flowing to the battery shell to cause the battery to short circuit, a plurality of insulating pieces need to be provided in the battery shell to electrically isolate the lead-out sheet from the battery shell and the tab from the battery shell. After the battery is used for a long time, the internal insulating pieces will move, affecting the electrical isolation effect between the lead-out sheet and the battery shell and between the tab and the battery shell. SUMMARY

[0005] The purpose of the present disclosure is to provide a battery, a battery pack and an electric device to solve the problem that the plurality of insulating pieces will move in the related art.

[0006] In order to achieve the above-mentioned purpose, the first purpose of the present disclosure provides a battery, comprising a pole core, a bottom shell accommodating the pole core, a cover plate covering the bottom shell, and an insulator provided in the bottom shell, the pole core comprising a tab, the tab being provided with a lead-out sheet, wherein,

[0007] The insulator comprises a first insulating piece for electrically isolating the lead-out sheet and the cover plate and a second insulating piece for electrically isolating the tab and the bottom shell, the first insulating piece being provided with a first matching structure, and the second insulating piece being provided with a second matching structure adapted to engage with the first matching structure.

[0008] Optionally, the first insulating piece comprises a first barrier sheet provided on the surface of the cover plate facing the lead-out sheet, and the second insulating piece comprises a second barrier sheet provided on the surface of the bottom shell facing the tab.

[0009] Optionally, the second insulating piece comprises two isolation blocks connected to the two sides of the second barrier sheet, and the first barrier sheet is arranged between the two isolation blocks,

[0010] The first matching structure comprises a notch formed in the edge of the first barrier sheet, and the second matching structure comprises a protrusion arranged on the inner side of the isolation block, the protrusion being embedded into the notch.

[0011] Optionally, the notch is formed in 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 first barrier sheet in the second direction, and the protrusion is clamped between the first barrier sheet and the cover plate.

[0012] The first direction is the length direction of the cover plate, and the second direction is the width direction of the cover plate.

[0013] Optionally, the matching surfaces of the notch and the protrusion are arc surfaces respectively.

[0014] Optionally, in the first direction, the maximum size D1 of the protrusion and the maximum size L1 of the notch satisfy: 0.5≤D1 / L1≤1.

[0015] Optionally, in the second direction, the maximum size D2 of the protrusion and the maximum size L2 of the notch satisfy: 0.5≤D2 / L2≤1.

[0016] Optionally, the lead-out sheet comprises:

[0017] a first contact plate in contact with the tab surface;

[0018] a second contact plate arranged opposite to the first contact plate; and

[0019] a third contact plate connected with the first contact plate and the second contact plate respectively.

[0020] Optionally, the first insulating member further comprises a third barrier sheet connected with the first barrier sheet and covering the surface of the third contact plate facing the core.

[0021] Optionally, the second insulating member further comprises 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 forming a C-shaped structure, and the first contact plate and the tab extending into the inside of the C-shaped structure.

[0022] Optionally, in the length direction of the cover plate, the maximum size W1 of the second contact plate and the maximum size W2 of the first barrier sheet satisfy: W2≤80mm, 0.6≤W1 / W2≤0.95.

[0023] Optionally, in the length direction of the cover plate, the maximum size W4 of the first contact plate and the maximum size W3 of the first contact plate satisfy: W3≤80mm, 0.5≤W4 / W3≤0.9.

[0024] Optionally, in the length direction of the cover plate, the maximum size W4 of the first contact plate and the maximum size W5 of the tab satisfy: 0.4≤W4 / W5≤0.9.

[0025] Optionally, a pole assembly is included, which is connected with the lead-out sheet and protrudes from the cover plate, and the bottom shell is provided with a recess for avoiding the pole assembly of another battery when the battery is stacked with the another battery.

[0026] Optionally, in the width direction of the bottom shell, the recess penetrates through the bottom shell.

[0027] Optionally, the pole assembly and the recess are respectively arranged at the end of the length direction of the battery.

[0028] Optionally, the pole assembly includes a positive pole assembly and a negative pole assembly, and the bottom shell is formed with a first recess corresponding to the positive pole assembly and a second recess corresponding to the negative pole assembly.

[0029] A second object of the present disclosure is to provide a battery pack including the battery as described in any one of the above.

[0030] A third object of the present disclosure is to provide an electrical device including the battery pack as described above.

[0031] Through the above technical solution, through the first and second matching structures, the first and second insulating members can be connected with each other, and the first and second insulating members can form a whole fixed to each other, and the first and second insulating members can be limited to each other, so that after the battery is used for a long time, the first and second insulating members will not move in the battery, and the electrical isolation effect between the lead-out sheet and the cover plate and between the tab and the bottom shell will not be affected.

[0032] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following specific embodiments to explain the present disclosure, but do not constitute a limitation of the present disclosure. In the drawings:

[0034] FIG. 1 is a structural schematic view of a battery provided by an exemplary embodiment of the present disclosure;

[0035] Fig. 2 is an enlarged view of part A in Fig. 1;

[0036] Fig. 3 is a sectional view of a battery according to an exemplary embodiment of the present disclosure;

[0037] Fig. 4 is an enlarged view of part B in Fig. 3;

[0038] Fig. 5 is an enlarged view of part C in Fig. 3;

[0039] Fig. 6 is a structural schematic view of a first insulating member, a second insulating member and a lead-out tab according to an exemplary embodiment of the present disclosure;

[0040] Fig. 7 is a top view of a first insulating member and a second insulating member according to an exemplary embodiment of the present disclosure;

[0041] Fig. 8 is a structural schematic view of a first insulating member and a second insulating member according to an exemplary embodiment of the present disclosure, in which a first mating structure and a second mating structure are connected to each other in a mating manner;

[0042] Fig. 9 is a structural schematic view of a second insulating member according to an exemplary embodiment of the present disclosure;

[0043] Fig. 10 is a schematic view of an electrical device according to an exemplary embodiment of the present disclosure.

[0044] BRIEF DESCRIPTION OF THE DRAWINGS 1 - battery; 2 - insulator; 3 - battery pack; 4 - electrical device; 100 - electrode core, 101 - tab, 200 - bottom shell, 201 - recess, 210 - first recess, 220 - second recess, 300 - cover plate, 400 - lead-out tab, 401 - first contact plate, 402 - second contact plate, 403 - third contact plate, 500 - first insulating member, 501 - first mating structure, 5011 - notch, 502 - first blocking piece, 503 - third blocking piece, 600 - second insulating member, 601 - second mating structure, 6011 - protruding edge, 602 - second blocking piece, 603 - isolation block, 604 - fourth blocking piece, 605 - fifth blocking piece, 700 - electrode post assembly, 710 - positive electrode post assembly, 720 - negative electrode post assembly. DETAILED DESCRIPTION

[0045] The specific embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0046] In the present disclosure, the orientation words used generally refer to the orientation of the relevant components in the actual use state, unless otherwise stated. "Inner, outer" can refer to the inner and outer of the profile of the corresponding component or its location inside or outside the environment. For example, the inner side of the isolation block 603 below refers to the side facing the core 100, and the inner side of the C-shaped structure refers to the inner side of its own profile. In addition, when the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements, unless otherwise indicated. 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.

[0047] As shown in FIGS. 1-9, the present disclosure provides a battery 1, comprising a core 100, a bottom shell 200 accommodating the core 100, a cover plate 300 covering the bottom shell 200, and an insulator 2 disposed in the bottom shell 200, the core 100 comprising a tab 101, the tab 101 being provided with a lead-out sheet 400, wherein the insulator 2 comprises a first insulating piece 500 for electrically isolating the lead-out sheet 400 and the cover plate 300, and a second insulating piece 600 for electrically isolating the tab 101 and the bottom shell 200, the first insulating piece 500 being provided with a first matching structure 501, and the second insulating piece 600 being provided with a second matching structure 601 adapted to engage with the first matching structure 501.

[0048] Through the above technical solution, through the first matching structure 501 and the second matching structure 601, the first insulating piece 500 and the second insulating piece 600 can be connected with each other, the first insulating piece 500 and the second insulating piece 600 can form a whole fixed to each other, the first insulating piece 500 and the second insulating piece 600 can be limited to each other, after the battery 1 is used for a long time, the first insulating piece 500 and the second insulating piece 600 will not move inside the battery 1, and will not affect the electrical isolation effect between the lead-out sheet 400 and the cover plate 300 and between the tab 101 and the bottom shell 200.

[0049] The first insulating piece 500 can comprise a first barrier sheet 502 disposed on the surface of the cover plate 300 facing the lead-out sheet 400, and the second insulating piece 600 can comprise a first contact plate 401 disposed on the surface of the bottom shell 200 facing the tab 101. In this way, the first barrier sheet 502 is disposed between the cover plate 300 and the lead-out sheet 400, ensuring the electrical isolation between the lead-out sheet 400 and the cover plate 300, and the first contact plate 401 is disposed between the bottom shell 200 and the tab 101, ensuring the electrical isolation between the surface of the tab 101 and the bottom shell 200.

[0050] In some embodiments, the second insulation member 600 can include two isolation blocks 603 connected to two sides of the second barrier sheet 602, and the first barrier sheet 502 is arranged between the two isolation blocks 603. The first matching structure 501 includes a notch 5011 formed in the edge of the first barrier sheet 502, and the second matching structure 601 includes a protrusion 6011 arranged on the inner side of the isolation block 603, which is embedded into the notch 5011. Referring to FIGS. 1 and 2, the outer side of the two isolation blocks 603 can directly abut against the bottom shell 200, and the isolation blocks 603 are limited by the bottom shell 200 to further limit the first contact plate 401, thereby ensuring the stability of the first contact plate 401. The isolation blocks 603 can also protect the two sides of the tab 101, so that the two sides of the tab 101 also do not contact the bottom shell 200. At the same time, the isolation blocks 603 can also protect the two sides of the lead-out sheet 400, so that the two sides of the lead-out sheet 400 also do not contact the bottom shell 200. The edges of the first barrier sheet 502 respectively 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 protrusion 6011 is directly arranged on the first contact plate 401, the protrusion 6011 and the notch 5011 cannot be matched and connected due to the height difference. By arranging the protrusion 6011 on the inner side of the isolation block 603, the protrusion 6011 and the notch 5011 overcome the height difference, and the first insulation member 500 and the second insulation member 600 can be matched and connected through the notch 5011 and the protrusion 6011.

[0051] The notch 5011 can be formed on the surface of the first blocking sheet 502 close to the cover plate 300 and at the end of the first blocking sheet 502 in the first direction and the end of the first blocking sheet 502 in the second direction, and the convex edge 6011 is clamped between the first blocking sheet 502 and the cover plate 300, wherein 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. Referring to FIG. 7, which is a top view of the first insulating piece 500 and the second insulating piece 600, in the drawing direction of FIG. 7, the left-right direction in the drawing direction of FIG. 7 is the length direction of the cover plate 300, and the up-down direction in the drawing direction of FIG. 7 is the width direction of the cover plate 300. The notch 5011 is located at the end of the first blocking sheet 502 in the first direction and the end of the first blocking sheet 502 in the second direction, and the convex edge 6011 on the isolation block 603 is also correspondingly arranged at the end of the isolation block 603 in the first direction and the end of the isolation block 603 in the second direction, so that the notch 5011 and the convex edge 6011 form a positioning reference. Referring to FIGS. 6 to 9, the first insulating piece 500 moves in the first direction, and the second cooperating structure 601 (i.e., the convex edge 6011) on the second insulating piece 600 can limit the first insulating piece 500 by connecting with the first cooperating structure 501 (i.e., the notch 5011), to ensure the installation position of the first insulating piece 500 and the second insulating piece 600. Referring to FIG. 7, when the cover plate 300 and the bottom shell 200 are installed with each other, the first insulating piece 500 and the second insulating piece 600 will move relatively in the first direction. During the installation process of the cover plate 300 and the bottom shell 200, the convex edge 6011 on the second insulating piece 600 will not be interfered by the first blocking sheet 502, and only when the first insulating piece 500 and the second insulating piece 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 clamped between the first blocking sheet 502 and the cover plate 300, so that the first blocking sheet 502 and the cover plate 300 fix the position of the convex edge 6011, further fix the position of the second insulating piece 600, so that the convex edge 6011 is less likely to be separated from the notch 5011, and the position of the second insulating piece 600 is more stable.

[0052] The mating surfaces of the notch 5011 and the convex edge 6011 can be arc surfaces respectively. Compared with straight edges, the arc surfaces can more evenly disperse stress, 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 cooperation of the arc surfaces reduces the sharp corner contact, the contact between the notch 5011 and the convex edge 6011 is more close, and the arc surfaces can also reduce the wear between the convex edge 6011 and the notch 5011 during long-time use of the battery 1, prolonging the service life of the convex edge 6011 and the notch 5011.

[0053] In the present disclosure, the first and second matching structures 501 and 601 can be notches 5011 and protrusions 6011 as mentioned above, or can be structures such as buckles and slots, or plug-in rods and plug-in slots, etc. In the present disclosure, the specific structure of the first and second matching structures 501 and 601 is not specifically limited, and the setting position of the first and second matching structures 501 and 601 is also not specifically limited, as long as the first and second matching structures 501 and 601 can be connected to each other.

[0054] It should be explained that in the actual design and production of the battery 1, the first and second matching structures 501 and 601 can be designed in various shapes, and the second contact plate 402, the first blocking sheet 502, the first contact plate 401, the first contact plate 401, and the tab 101 mentioned below can also be designed in various shapes. The dimensions represented by D1, L1, D2, L2, W1, W2, W3, W4, and W5 mentioned below all refer to the maximum dimension of the corresponding structure in the corresponding direction without special instructions, for example, D1 represents the maximum dimension of the protrusion 6011 in the length direction of the cover plate 300, and W2 represents the maximum dimension of the first blocking sheet 502 in the length direction of the cover plate 300.

[0055] In some embodiments, in the first direction, the maximum dimension D1 of the protrusion 6011 and the maximum dimension L1 of the notch 5011 can satisfy 0.5≤D1 / L1≤1. Specifically, referring to FIG. 7, the maximum dimension D1 of the protrusion 6011 is less than the maximum dimension L1 of the notch 5011, which ensures that the protrusion 6011 and the notch 5011 do not interfere with each other in the first direction, and the maximum dimension D1 of the protrusion 6011 is greater than or equal to 0.5 times the maximum dimension L1 of the notch 5011, which ensures that the protrusion 6011 and the notch 5011 have sufficient contact area in the first direction, and ensures the effect of preventing the insulation member from moving of the first and second matching structures 501 and 601.

[0056] In the second direction, the maximum dimension D2 of the protrusion 6011 and the maximum dimension L2 of the notch 5011 can satisfy 0.5≤D2 / L2≤1. Specifically, referring to FIG. 7, the maximum dimension D2 of the protrusion 6011 is less than the maximum dimension L2 of the notch 5011, which ensures that the protrusion 6011 and the notch 5011 do not interfere with each other in the second direction, and the maximum dimension D2 of the protrusion 6011 is greater than or equal to 0.5 times the maximum dimension L2 of the notch 5011, which ensures that the protrusion 6011 and the notch 5011 have sufficient contact area in the second direction, and ensures the effect of preventing the insulation member from moving of the first and second matching structures 501 and 601.

[0057] Referring to FIGS. 2-5, the tab 400 can 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 arranged opposite to the first contact plate 401; and the third contact plate 403 is connected with the first contact plate 401 and the second contact plate 402, respectively. That is, the tab can be configured in a U shape. In the present disclosure, the second contact plate 402 can be in contact with the pole assembly 700, which is an interface between the electrochemical system inside the battery 1 and the external circuit. Through the tab 400, electrical energy can be transmitted to the external circuit connection through the tab 101, the tab 400, and the pole, realizing the conversion and transmission of energy. The tab 400 configured in a U shape can provide a larger contact area, and through the surface contact of the first contact plate 401 with the tab 101 and the contact of the second contact plate 402 with the pole assembly 700, the overcurrent capacity is ensured. It should be noted here that although the pole assembly 700 shown in the drawings is only placed on the surface of the cover plate 300, in the actual structure, the pole assembly 700 is accommodated in the bottom shell 200, which is connected with the tab 400 and protrudes from the cover plate 300 to connect with the external structure. Among them, the first insulating member 500 and the cover plate 300 can have a passage for the pole assembly 700 to pass through, and the specific structure will not be described here.

[0058] The above-mentioned U-shaped design can increase the mechanical strength of the tab 400, so that it is not easy to deform or break during the assembly and use of the battery 1, thereby improving the reliability and service life of the battery 1. And compared with other complex-shaped tabs 400, the manufacturing process of the U-shaped tab 400 is simpler and the cost is lower. In order to avoid the first contact plate 401 from shaking off the tab 101 during the use of the battery 1, the first contact plate 401 can be welded with the tab 101 on the basis of surface contact. The opening of the U-shaped tab 400 is usually directed away from the pole core 100, which facilitates the welding of the first contact plate 401 with the tab 101 by the operator.

[0059] The first insulating member 500 can further include a third barrier sheet 503 connected with the first barrier sheet 502 and covering the surface of the third contact plate 403 facing the pole core 100. Referring to FIG. 4, the third barrier sheet 503 can be arranged below the first barrier sheet and connected with the first barrier sheet 502, so that the third barrier sheet 503 covers the surface of the third contact plate 403 facing the pole core 100. In this way, the third barrier sheet 503 can be arranged between the third contact plate 403 and the pole core 100, avoiding the contact between the third contact plate 403 and the pole core 100 causing short circuit of the battery 1.

[0060] Referring to FIGS. 4 and 5 and FIG. 9, the second insulating member 600 can 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 forming a C-shaped structure, and the first contact plate 401 and the tab 101 extending inside the C-shaped structure. Referring to FIGS. 4 and 5, the fourth barrier sheet 604 can be disposed on one side of the tab 101 facing the bottom case 200, the fifth barrier sheet 605 can be disposed on one side of the tab 101 facing the cover plate 300, and the fourth barrier sheet 604 and the fifth barrier sheet 605 are respectively connected to the first contact plate 401. Further referring to FIG. 4, for example, in the direction of the drawing surface of FIG. 4, the tab 101 has a certain thickness, and the end of the tab 101 forms a side facing the bottom case 200, and the fifth barrier sheet 605 is disposed on 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, and the first contact plate 401 is disposed on one side of the tab 101 facing the cover plate 300, and the second contact plate 402 is disposed on the cover plate 300, and the fifth barrier sheet 605 can be disposed on the first contact plate 401, thereby ensuring insulation between the first contact plate 401 and the second contact plate 402, and ensuring insulation between the tab 101 and the cover plate 300. The second barrier sheet 602, the fifth barrier sheet 605, and the fourth barrier sheet 604 form the inside of the C-shaped structure, and a receiving space is formed, and the first contact plate 401 and the tab 101 can be accommodated in the receiving space, and the second barrier sheet 602, the fifth barrier sheet 605, and the fourth barrier sheet 604 can be enclosed on the tab 101 and the first contact plate 401, so that the tab 101 and the first contact plate 401 can be prevented from being electrically connected to the bottom case 200 and the cover plate 300 when they are displaced due to shaking during use.

[0061] In some embodiments, in the length direction of the cover plate 300, i.e. in the first direction, the maximum size W1 of the second contact plate 402 and the maximum size W2 of the first barrier sheet 502 can satisfy: W2≤80mm, 0.6≤W1 / W2≤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 in the battery 1, maximizes the remaining space inside the battery 1, can provide more electrolyte storage space, and leaves more exhaust space for the battery 1. When the battery 1 is in thermal runaway, the volume of the molten material of the first barrier sheet 502 is small, which can be quickly discharged to the outside of the battery 1, avoid the molten material of the first barrier sheet 502 blocking the exhaust port of the battery 1, prevent the battery 1 from catching fire or exploding, etc., and ensure the liquid storage space and safety of the battery 1. If the maximum size W2 of the first barrier sheet 502 is greater than 80mm, the first barrier sheet 502 will occupy too much space in the battery 1. If the maximum size W1 of the second contact plate 402 is less than 0.6 times the maximum size W2 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 the insulation effect of the first barrier sheet 502 is partially wasted. It is necessary to reduce the maximum size of the first barrier sheet 502 to reduce the space occupied by the first barrier sheet 502 in the battery 1. If the maximum size W1 of the second contact plate 402 is greater than 0.95 times the maximum size W2 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 the insulation effect of the first barrier sheet 502 is difficult to guarantee. It is necessary to increase the maximum size of the first barrier sheet 502.

[0062] In the length direction of the cover plate 300, i.e. in the first direction, the maximum dimension W4 of the first contact plate 401 and the maximum dimension W3 of the first contact plate 401 can satisfy: W3≤80mm, 0.5≤W4 / W3≤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 in the battery 1, maximizes the remaining space inside the battery 1, can provide more electrolyte storage space, and leaves more exhaust space for the battery 1. When the battery 1 is in thermal runaway, the volume of the molten material of the first contact plate 401 is small, which can be quickly discharged to the outside of the battery 1, avoid the molten material of the first contact plate 401 blocking the exhaust port of the battery 1, prevent the battery 1 from catching fire or exploding, etc. phenomenon, and ensure the liquid storage space and safety of the battery 1. If the maximum dimension W3 of the first contact plate 401 is greater than 80mm, the first contact plate 401 will occupy too much space in the battery 1. If the maximum dimension W4 of the first contact plate 401 is less than 0.5 times the maximum dimension W3 of the first contact plate 401, it means that the maximum dimension of the first contact plate 401 and the difference between the maximum dimension of the first contact plate 401 are too large, i.e. the maximum dimension of the contact surface of the first contact plate 401 and the tab 101 in the first direction and the maximum dimension of the first contact plate 401 are too large, the insulation effect of the first contact plate 401 is partially wasted, and the maximum dimension of the first contact plate 401 needs to be reduced. If the maximum dimension W4 of the first contact plate 401 is greater than 0.9 times the maximum dimension W3 of the first contact plate 401, i.e. the maximum dimension of the contact surface of the first contact plate 401 and the tab 101 in the first direction and the maximum dimension of the first contact plate 401 are too close, the insulation effect of the first contact plate 401 is insufficient, and the maximum dimension of the first contact plate 401 needs to be increased.

[0063] In the length direction of the cover plate 300, i.e. the first direction, the maximum size W4 of the first contact plate 401 and the maximum size W5 of the tab 101 can satisfy: 0.4≤W4 / W5≤0.9. It is ensured that the first contact plate 401 and the tab 101 have sufficient contact area, ensuring the overcurrent effect while ensuring the welding strength between the first contact plate 401 and the tab 101 when the first contact plate 401 and the tab 101 are welded. If the maximum size W4 of the first contact plate 401 is less than 0.4 times the maximum size W5 of the tab 101, it means 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 overcurrent effect and the welding strength mentioned above, and the maximum size of the first contact plate 401 in the first direction needs to be increased. If the maximum size W4 of the first contact plate 401 is greater than 0.9 times the maximum size W5 of the tab 101, it means that the first contact plate 401 is too long and will be too close to the core 100, which is easy to contact between the core 100 and the first contact plate 401, causing the battery 1 to short circuit, and the too 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, which further reduces the space in the battery 1.

[0064] In addition, with reference to FIGS. 3-5, the pole assembly 700 protrudes from the cover plate 300, and the bottom shell 200 can be provided with a recess 201 for avoiding the pole assembly 700 of another battery 1 when the battery 1 is stacked with the another battery. In this way, two batteries 1 can be arranged in close contact, and the pole assembly 700 no longer occupies the installation space of the battery 1, and the space utilization is better.

[0065] According to some embodiments, in the width direction of the bottom shell 200 (i.e. the second direction mentioned above), the recess 201 can be provided through the bottom shell 200. That is, in the second direction, the size of the recess 201 is equal to the overall size of the bottom shell 200. The through recess 201 does not affect the arrangement of electrical elements in the battery 1, and also facilitates the processing of the recess 201 itself.

[0066] According to some embodiments, the pole assembly 700 and the recess 201 are respectively arranged at the end of the length direction of the battery 1 (i.e. the first direction mentioned above). In this way, after the battery 1 is stacked, the external conductor is more easily electrically connected with the pole assembly 700, and the pole assemblies 700 between adjacent batteries 1 are also more easily connected.

[0067] In addition, referring to FIG. 3, the pole assembly 700 includes a positive pole assembly 710 and a negative pole assembly 720, and the bottom case 200 is formed with a first recess 210 corresponding to the positive pole assembly 710 and a second recess 220 corresponding to the negative pole assembly 720. The positive pole assembly 710 and the first recess 210 are located at one end of the battery 1, and the negative pole assembly 720 and the second recess 220 are located at the other end of the battery 1.

[0068] According to a second aspect of the present disclosure, there is also provided a battery pack 3 comprising the battery 1 of any of the above embodiments and having all the advantages thereof, which will not be repeated here.

[0069] According to a third aspect of the present disclosure, there is also provided an electric device 4 comprising the battery pack 3 described above and having all the advantages thereof, which will not be repeated here. The present disclosure does not limit the specific type of the electric device 4, which may, for example, be an electric vehicle.

[0070] The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above-described embodiments. Within 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 belong to the protection scope of the present disclosure.

[0071] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0072] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A battery (1) characterized in that, The battery includes a pole core (100), a bottom shell (200) containing the pole core (100), a cover plate (300) covering the bottom shell (200), and an insulator (2) arranged in the bottom shell (200), the pole core (100) includes a pole lug (101), and a lead-out sheet (400) is arranged on the pole lug (101), wherein The insulator (2) includes a first insulating piece (500) for electrically isolating the lead-out sheet (400) and the cover plate (300) and a second insulating piece (600) for electrically isolating the pole lug (101) and the bottom shell (200), the first insulating piece (500) is provided with a first matching structure (501), and the second insulating piece (600) is provided with a second matching structure (601) adapted to engage with the first matching structure (501).

2. The battery (1) according to claim 1, characterized in that The first insulating piece (500) includes a first barrier sheet (502) arranged on a surface of the cover plate (300) facing the lead-out sheet (400), and the second insulating piece (600) includes a second barrier sheet (602) arranged on a surface of the bottom shell (200) facing the pole lug (101).

3. The battery (1) according to claim 2, characterized in that The second insulating piece (600) includes two isolation blocks (603) connected to two sides of the second barrier sheet (602), the first barrier sheet (502) is arranged between the two isolation blocks (603), The first matching structure (501) includes a notch (5011) formed in an edge of the first barrier sheet (502), and the second matching structure (601) includes a convex edge (6011) arranged on an inner side of the isolation block (603), and the convex edge (6011) is embedded into the notch (5011).

4. The battery (1) according to claim 3, characterized in that The notch (5011) is formed in the first barrier sheet (502) close to the surface of the cover plate (300) and located at an end portion in a first direction and an end portion in a second direction of the first barrier sheet (502), and the convex edge (6011) is clamped between the first barrier sheet (502) and the cover plate (300), The first direction is a length direction of the cover plate (300), and the second direction is a width direction of the cover plate (300).

5. The battery (1) according to claim 3 or 4, characterized in that The matching surfaces of the notch (5011) and the convex edge (6011) are respectively arc surfaces.

6. The battery (1) according to any one of claims 3-5, characterized in that, In the first direction, the maximum size D1 of the convex edge (6011) and the maximum size L1 of the notch (5011) satisfy: 0.5≤D1 / L1≤1.

7. The battery (1) according to any one of claims 3-6, characterized in that, In the second direction, the maximum size D2 of the convex edge (6011) and the maximum size L2 of the notch (5011) satisfy: 0.5≤D2 / L2≤1.

8. The battery (1) according to any one of claims 1-7, characterized in that, The lead-out sheet (400) includes: a first contact plate (401) in surface contact with the pole lug (101); a second contact plate (402) arranged opposite to the first contact plate (401); and a third contact plate (403) connected with the first contact plate (401) and the second contact plate (402) respectively.

9. The battery (1) according to claim 8, characterized in that The first insulating piece (500) further comprises a third barrier sheet (503) connected with the first barrier sheet (502) and covering a surface of the third contact plate (403) facing the pole core (100).

10. The battery (1) according to claim 8 or 9, characterized in that The second insulating piece (600) further comprises 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 inside of the C-shaped structure.

11. The battery (1) according to any one of claims 8-10, characterized in that, In the length direction of the cover plate (300), the maximum size W1 of the second contact plate (402) and the maximum size W2 of the first barrier sheet (502) satisfy: W2≤80mm, 0.6≤W1 / W2≤0.

95.

12. The battery (1) according to any one of claims 8-11, characterized by In the length direction of the cover plate (300), the maximum size W4 of the first contact plate (401) and the maximum size W3 of the second barrier sheet (602) satisfy: W3≤80mm, 0.5≤W4 / W3≤0.

9.

13. The battery (1) according to any one of claims 8-12, characterized in that, In the length direction of the cover plate (300), the maximum size W4 of the first contact plate (401) and the maximum size W5 of the tab (101) satisfy: 0.4≤W4 / W5≤0.

9.

14. The battery (1) according to any one of claims 1-13, characterized by The battery (1) further comprises a pole post assembly (700) connected with the lead-out sheet (400) and protruding from the cover plate (300), and the bottom shell (200) is provided with a recess (201) for avoiding the pole post assembly (700) of another battery (1) when the battery (1) is stacked with the another battery (1).

15. The battery (1) according to claim 14, characterized in that In the width direction of the bottom shell (200), the recess (201) penetrates through the bottom shell (200).

16. The battery (1) according to claim 14 or 15, characterized in that The pole post assembly (700) and the recess (201) are respectively arranged at the end in the length direction of the battery (1).

17. The battery (1) according to any one of claims 14-16, characterized by The pole post assembly (700) comprises a positive pole post assembly (710) and a negative pole post assembly (720), and the bottom shell (200) is formed with a first recess (210) corresponding to the positive pole post assembly (710) and a second recess (220) corresponding to the negative pole post assembly (720).

18. A battery pack (3) characterized by The battery (1) of any one of claims 1-17.

19. An electrical consumer (4), characterized in that The battery pack (3) of claim 18.

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