Battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery which comprises a shell provided with an accommodating cavity and an opening, the opening is communicated with the accommodating cavity, and the opening is positioned at one end of the shell in a first direction; the battery cell is arranged in the accommodating cavity and comprises a battery cell body and a tab, the tab is connected with one side, facing the opening, of the battery cell body, and the size of the tab exceeding the battery cell body is L1; the top cover is connected with the shell and covers the opening, and the size of the top cover in the second direction is W1; the pole comprises a main body part and a connecting part, the main body part penetrates through the top cover and is connected with the connecting part, the connecting part is positioned on one side, facing the battery cell, of the top cover and is connected with the tab, and the size of the connecting part in the second direction is W2; 0.5 < = W2 / W1 < 1, and 10 mm < = L1 < = 30 mm. According to the battery, the size of the connecting part is increased, so that the pole is directly connected with the tab, a connecting sheet is not needed, the tab is prevented from being too long, the probability of inversely inserting the tab is reduced, the charging time is shortened, and the charging safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery. Background Technology

[0002] Batteries in related technologies typically include a top cover and a casing connected to each other. The casing contains a battery cell with tabs connected to it. The top cover has terminals, and the terminals and tabs are electrically connected by connecting pieces, resulting in a large number of battery parts.

[0003] Therefore, in order to reduce the number of parts, the connecting piece is omitted in some batteries so that the tab is directly connected to the terminal. However, this will increase the length of the tab, and the tab is prone to stacking. It is easy for the tab to be inserted into the cell backward. In addition, the longer the tab is, the longer the current takes to pass through the tab, which affects the charging efficiency. It may also cause local overheating due to the concentrated current, especially affecting the safety performance under fast charging. Utility Model Content

[0004] In view of this, the present invention provides a battery to solve the problem of reverse insertion of the electrode tab when the terminal post and the electrode tab are directly connected.

[0005] This utility model provides a battery, comprising: a casing having a receiving cavity and an opening, the opening communicating with the receiving cavity, the opening being located at one end of the casing in a first direction; a battery cell disposed within the receiving cavity, comprising a battery cell body and a tab, the tab being connected to the side of the battery cell body facing the opening, the tab extending beyond the battery cell body by a dimension L1; a top cover connected to the casing and sealing the opening, the top cover having a dimension W1 in a second direction, the first direction and the second direction being intersecting; and a terminal post comprising a main body and a connecting part, the main body passing through the top cover and connected to the connecting part, the connecting part being located on the side of the top cover facing the battery cell and connected to the tab, the connecting part having a dimension W2 in a second direction; wherein, 0.5≤W2 / W1<1, 10mm≤L1≤30mm.

[0006] In one alternative implementation, 26mm ≤ W1 ≤ 75mm, and / or, 5mm ≤ W2 ≤ 62mm.

[0007] In one optional embodiment, in the second direction, the distance between the connecting portion and the housing is H1, where 0.05≤H1 / L1≤3, and 3mm≤H1≤30mm.

[0008] In one optional embodiment, the tab and the connecting portion are welded together and have a weld mark, the weld mark extending along a third direction, the first direction, the second direction and the third direction intersecting each other; along the third direction, the size of the connecting portion is L2, the size of the weld mark is L3, 1.1≤L2 / L3≤5, 12mm≤L2≤60mm, 8mm≤L3≤45mm.

[0009] In one optional embodiment, the cross-sectional area of ​​the electrode tab is S1 along its thickness direction, and the area of ​​the solder mark is S2, where 0.3 ≤ S2 / S1 ≤ 3, and 0.6 mm. 2 ≤S1≤90mm 2 12mm 2 ≤S2≤180mm 2 .

[0010] In one optional embodiment, the cross-sectional area of ​​the connecting portion perpendicular to the third direction is S3, and the area of ​​the solder mark is S2, where 0.3 ≤ S2 / S3 ≤ 3.4 mm. 2 ≤S3≤15mm 2 .

[0011] In one optional embodiment, the area of ​​the main body portion projected in the first direction is S4, where 0.3 ≤ S4 / S3 ≤ 3, and 7.06 mm. 2 ≤S4≤452.17mm 2 .

[0012] In one alternative embodiment, the tab and the post are welded by laser welding.

[0013] In one alternative embodiment, the battery further includes a protective element disposed on the side of the tab facing away from the connection portion and covered by the solder mark.

[0014] In one alternative embodiment, there are two battery cells arranged along the second direction, and the tabs of the two battery cells are connected to opposite sides of the connection portion in the second direction.

[0015] In one optional embodiment, the top cover has a first protrusion that protrudes away from the battery cell along the first direction, and a first groove is provided on the side of the first protrusion facing the battery cell; the area projected by the connecting portion along the first direction is S5, and the groove area of ​​the first groove is S6, where 1 ≤ S6 / S5 ≤ 1.5, 60 mm. 2 ≤S5≤3720mm 2 64mm 2 ≤S6≤3844mm 2 .

[0016] In one alternative embodiment, the connecting portion has a first center line in the third direction, and the top cover has a second center line in the third direction; in the third direction, the central axis of the main body portion is located on the side opposite to the second center line from the first center line.

[0017] In one optional embodiment, the battery further includes: an insulating member disposed between the terminal post and the top cover; the main body portion passing through the insulating member; the insulating member having a second protrusion protruding away from the battery cell along the first direction; a second groove being provided on the side of the second protrusion facing the battery cell; the second protrusion being located within the first groove; and the connecting portion being located within the second groove; wherein, a support block is provided on the side of the insulating member facing the battery cell; along the third direction, the minimum distance between the connecting portion and the support block is H2, where 5mm ≤ H2 ≤ 50mm.

[0018] Beneficial effects: In this embodiment of the invention, the portion of the tab extending beyond the battery cell is bent to directly weld the tab to the side of the connector facing the battery cell. When 0.5 ≤ W2 / W1 < 1, the size of the connector in the second direction is at least half the size of the top cover. This increases the size of the connector in the second direction, increasing the contact area for current transmission and helping to reduce the resistance generated when current passes through the terminal post, thereby improving current transmission efficiency, increasing battery overcurrent, and enhancing battery fast charging capability. Furthermore, by setting the tab size to 10mm ≤ L1 ≤ 30mm, the internal resistance of the battery can be reduced, making the current distribution more uniform and further improving the battery fast charging capability. Simultaneously, it reduces localized overheating and current concentration, ensuring battery stability and reliability. The tab size design, while ensuring the reliability of the tab and connector, reduces the size of the tab extending beyond the battery cell, preventing the accumulation of the portion of the tab extending beyond the battery cell and not connected to the connector, reducing the probability of tab 300° inversion problems, and further improving battery safety and reliability. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of the present invention;

[0021] Figure 2One of the cross-sectional views of the battery according to an embodiment of the present utility model;

[0022] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0023] Figure 4 This is a schematic diagram showing the arrangement of the battery casing, terminals, cells, and terminals in an embodiment of the present invention.

[0024] Figure 5 This is a second cross-sectional view of the battery according to an embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram showing the arrangement of the terminals, cells, and terminals of a battery according to an embodiment of the present invention.

[0026] Figure 7 One of the exploded views of the top cover, insulating component, and terminal post of the battery according to an embodiment of this utility model;

[0027] Figure 8 This is a second exploded view of the top cover, insulating component, and terminal post of the battery according to an embodiment of the present utility model;

[0028] Figure 9 This is a schematic diagram of the battery cell with its tabs not bent, according to an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Battery;

[0031] 100. Shell; 110. Receiving cavity; 120. Opening;

[0032] 200. Battery cell; 210. Battery cell body;

[0033] 300, Electrode;

[0034] 400, Top cover; 410, First convex bulge; 420, First groove;

[0035] 500, pole post; 510, main body; 520, connecting part;

[0036] 600. Explosion-proof valve;

[0037] 700, Insulating component; 710, Second convex bulge; 720, Second groove; 730, Support block. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] In the description of this utility model, "a plurality of" means two or more. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] The following is combined Figures 1 to 9 The following describes embodiments of the present invention.

[0043] According to an embodiment of the present invention, a battery 1 is provided, which includes a casing 100, a cell 200, a tab 300, a top cover 400, and a terminal post 500.

[0044] The housing 100 has a receiving cavity 110 and an opening 120, which communicate with the receiving cavity 110. The opening 120 is located at one end of the housing 100 in a first direction. The battery cell 200 is disposed within the receiving cavity 110. The battery cell 200 includes a battery cell body 210 and a tab 300. The tab 300 is connected to the side of the battery cell body 210 facing the opening 120, and the tab 300 extends beyond the battery cell body 210 by a dimension L1. It should be noted that L1 is not the dimension of the tab 300 extending beyond the electrode plate it is connected to, but rather the dimension of the tab 300 extending beyond the entire battery cell body 210 on the side facing the top cover 400.

[0045] The top cover 400 is connected to the housing 100 and seals the opening 120. The top cover 400 has a dimension of W1 in the second direction, and the first and second directions intersect. The electrode post 500 includes a main body 510 and a connecting part 520. The main body 510 passes through the top cover 400 and is connected to the connecting part 520. The connecting part 520 is located on the side of the top cover 400 facing the cell 200 and is connected to the electrode tab 300. The connecting part 520 has a dimension of W2 in the second direction.

[0046] Among them, 26mm≤W1≤75mm, 5mm≤W2≤62mm. When 0.5≤W2 / W1<1, 10mm≤L1≤30mm; when 0<W2 / W1<0.5, 18mm≤L1≤35mm.

[0047] For example, the battery cell 200 can be a wound battery cell or a stacked battery cell; the first direction can be the height direction of the battery 1; the second direction can be the thickness direction of the battery 1, and the first and second directions can be set perpendicularly.

[0048] Furthermore, W1 can be 26mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, or 75mm; W2 can be 5mm, 10mm, 15mm, 20mm, 26mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, or 62mm.

[0049] When 0.5≤W2 / W1<1, for example when W2 / W1 is 0.5, 0.6, 0.7, 0.8, 0.9 or 0.99, L1 can be 10mm, 12mm, 15mm, 18mm, 20mm, 22mm, 25mm, 28mm or 30mm.

[0050] Specifically, the portion of the tab 300 extending beyond the cell body 210 is bent to connect the tab 300 to the side of the connector 520 facing the cell 200. When 0.5 ≤ W2 / W1 < 1, since the top cover 400 needs to be connected to the housing 100, and the connector 520 is located inside the housing 100, by setting W2 / W1 < 1, interference between the connector 520 and the housing 100 can be avoided, ensuring the reliability of the battery 1 assembly.

[0051] Since W2 / W1 is not less than 0.5, the size of the connecting portion 520 in the second direction is at least half the size of the top cover 400. This increases the size of the connecting portion 520 in the second direction, ensuring the reliability of the tab 300 and the connecting portion 520 while reducing the size of the tab 300 extending beyond the cell body 210. Furthermore, it increases the current transmission area on the connecting portion 520, helping to reduce the resistance generated when current passes through the terminal 500, thereby improving current transmission efficiency, increasing battery overcurrent, and enhancing battery fast charging capability.

[0052] In addition, L1 is no more than 30mm in length, which reduces the material used in the tab 300, lowers the cost, and prevents the tab 300 from extending beyond the cell body 210 and accumulating in the part not connected to the connection part 520, thus reducing the probability of the tab 300 being inserted in reverse. It also shortens the time required for current to pass through the tab 300, which can reduce the battery's internal resistance, make the current distribution more uniform, further improve the battery's fast charging capability, and reduce the heat generated by current passing through the tab 300, thereby preventing local overheating and current concentration, and improving the battery's stability and reliability.

[0053] Normally, when the tab 300 needs to be bent, in addition to the part connected to the connecting part 520, there is also a bending section between the connecting part 520 and the cell body 210. By setting L1 to be no less than 10mm, the bending of the tab 300 can be achieved while ensuring the reliability of the tab 300 and the connecting part 520.

[0054] like Figure 4 As shown, in some embodiments, in the second direction, the distance between the connecting part 520 and the housing 100 is H1, 0.05≤H1 / L1≤3, 3mm≤H1≤30mm.

[0055] Wherein, H1 / L1 can be 0.05, 0.08, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3;

[0056] H1 is 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm or 30mm.

[0057] By setting H1 / L1 to be no less than 0.05, it is possible to avoid the connection part 520 and the housing 100 having too small a distance in the second direction, which would prevent the insulating part 700 from being reliably arranged between the housing 100 and the connection part 520, thereby reducing the risk of electrical conductivity between the housing 100 and the connection part 520 and improving the safety of the battery 1.

[0058] By setting H1 / L1 to be no greater than 3, it is possible to avoid the connection part 520 being too far from the housing 100 in the second direction, which would result in the connection part 520 being too small in the second direction. This also prevents the tab 300 from exceeding the size of the cell body 210 by too much, thereby reducing costs. Furthermore, it prevents the portion of the tab 300 that exceeds the cell body 210 and is not connected to the connection part 520 from accumulating, thus reducing the probability of the tab 300 being inserted backwards. Additionally, it increases the overlap area between the connection part 520 and the tab 300, thereby ensuring the reliability of the connection between the connection part 520 and the tab 300.

[0059] In some embodiments not shown, the tab 300 and the connecting portion 520 are welded together and have solder marks (not shown in the figure). The solder marks extend along a third direction, and the first direction, the second direction and the third direction are arranged to intersect each other. There may be one solder mark or multiple solder marks. Multiple solder marks are arranged at intervals along the second direction. The third direction may be the width direction of the battery 1. The first direction, the second direction and the third direction may be arranged perpendicularly to each other.

[0060] Along the third direction, the dimension of the connecting part 520 is L2, the dimension of the solder mark is L3, 1.1≤L2 / L3≤5, 12mm≤L2≤60mm, 8mm≤L3≤45mm.

[0061] For example, L2 / L3 can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.5, 3, 3.5, 4, 4.5 or 5; L2 can be 12mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm or 60mm; L3 can be 8mm, 12mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm or 60mm.

[0062] By setting L2 / L3 to no more than 1.5, it is possible to avoid the weld mark in the third direction being too small relative to the size of the connecting part 520, so as to ensure that the welding area between the connecting part 520 and the tab 300 is relatively large in the third direction, thereby improving the effective utilization rate of the connecting part 520, ensuring the current flow efficiency between the tab 300 and the connecting part 520, and the welding strength. By setting L2 / L3 to no less than 1.1, on the one hand, the welding cost is reduced, and on the other hand, the connecting part 520 needs to reserve some space to cooperate with the welding equipment, ensuring welding efficiency and welding reliability.

[0063] Furthermore, along the thickness direction of the tab 300, the cross-sectional area of ​​the tab 300 is S1, and the area of ​​the solder mark is S2, where 0.3 ≤ S2 / S1 ≤ 3, and 0.6 mm. 2 ≤S1≤90mm 2 12mm 2 ≤S2≤180mm 2 Where S2 / S1 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, or 3; S1 can be 0.6 mm. 2 1mm 2 5mm 2 10mm 2 15mm 2 20mm 2 25mm 2 30mm 2 35mm 2 40mm 2 45mm 2 50mm 2 55mm 2 60mm 2 65mm 2 70mm 2 75mm 2 80mm 2 85mm 2 Or 90mm 2 S2 can be 12mm 2 15mm 2 20mm 2 25mm 2 30mm 2 35mm 2 40mm 2 45mm 2 50mm2 55mm 2 60mm 2 65mm 2 70mm 2 75mm 2 80mm 2 85mm 2 90mm 2 95mm 2 100mm 2 105mm 2 110mm 2 115mm 2 Or 120mm 2 .

[0064] By setting S2 / S1 to no more than 3, we can avoid S1 being too small, thus ensuring current flow efficiency and preventing the solder area from being too large, thereby reducing welding costs. The tab 300 needs to reserve some space to cooperate with the welding equipment, ensuring welding efficiency and reliability. By setting S2 / S1 to no less than 0.3, we can avoid S1 being too large, thus reducing the cost of the tab 300 and preventing the solder area from being too small, thereby improving the effective utilization rate of the tab 300, ensuring the consistency of current flow in all areas of the tab 300, and improving the current flow yield and welding strength.

[0065] Furthermore, the cross-sectional area of ​​the connecting part 520 perpendicular to the third direction is S3, and the area of ​​the solder mark is S2, where 0.3 ≤ S2 / S3 ≤ 3.4 mm. 2 ≤S3≤15mm 2 Wherein, S2 / S3 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, or 3; S3 can be 4mm. 2 1mm 2 2mm 2 3mm 2 4mm 2 5mm 2 6mm 2 7mm 2 8mm 2 9mm 2 10mm 2 11mm 2 12mm 2 13mm 2 14mm 2 Or 15mm 2 .

[0066] By setting S2 / S3 to no greater than 3, the cross-sectional area of ​​the connector 520 perpendicular to the third direction can be prevented from being too small, thus ensuring current flow efficiency and preventing the solder area from being too large, reducing welding costs. The connector 520 needs to reserve some space to cooperate with the welding equipment, ensuring welding efficiency and welding reliability. By setting S2 / S3 to no less than 0.3, the cross-sectional area of ​​the connector 520 perpendicular to the third direction can be prevented from being too large, reducing the cost of the connector 520 and preventing the solder area from being too small, improving the effective utilization rate of the connector 520, ensuring the consistency of current flow in each area of ​​the connector 520, improving current flow yield and welding strength.

[0067] like Figure 4 As shown, in some embodiments, the area projected onto the main body 510 in the first direction is S4, 0.3≤S4 / S3≤3, 7.06mm. 2 ≤S4≤452.17mm 2 Wherein, S4 / S3 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, or 3; S4 can be 7.06, Π 2.25mm 2 Π 4mm 2 Π 9mm 2 Π 16mm 2 Π 25mm 2 Π 36mm 2 Π 49mm 2 Π 64mm 2 Π 81mm 2 Π 100mm 2 Π 121mm 2 Π 144mm 2 Or 452.17.

[0068] By setting S4 / S3 to no greater than 3, the cross-sectional area of ​​the main body 510 can be prevented from being too small, thus ensuring current flow efficiency, and the cross-sectional area of ​​the connecting part 520 can be prevented from being too large, thus reducing cost and weight. By setting S4 / S3 to no less than 0.3, the cross-sectional area of ​​the main body 510 can be prevented from being too large, thus reducing the cost of the pole 500, and the cross-sectional area of ​​the connecting part 520 can be prevented from being too small, thus ensuring current flow consistency in all areas of the connecting part 520 and improving current flow yield.

[0069] Specifically, the tab 300 and the pole post 500 are welded by laser welding. In related technologies, the tab and pole post are connected by a connecting piece, and the connecting piece and the tab are welded by ultrasonic welding. In this utility model, since the connecting piece is eliminated, the tab 300 and the pole post 500 need to be directly welded together. The inventors found that in this structure, the distance between the connecting part 520 of the pole post 500 and the top cover 400 and the insulating part 700 is small, making ultrasonic welding difficult. Therefore, laser welding is used to weld the tab 300 and the pole post 500, improving production efficiency and ensuring the welding strength between the connecting part 520 and the tab 300.

[0070] Furthermore, battery 1 also includes a protective component, which is located on the side of tab 300 facing away from connection portion 520 and is covered with solder marks. The protective component can be adhesive tape. By providing the protective component, solder slag from the solder marks can be prevented from falling into the receiving cavity 110 and affecting the performance of cell 200, thereby avoiding impact on the performance of battery 1 and extending the service life of battery 1.

[0071] like Figures 4-6 As shown, in some embodiments, there are two battery cells 200, which are arranged along the second direction, and the tabs 300 of each battery cell 200 are connected to the connecting portion 520 on opposite sides in the second direction.

[0072] For example, each tab 300 can be equipped with a protective element, which can improve protection reliability and the overall size of the protective element is small, which helps to save costs. Alternatively, two adjacent tabs 300 in the second direction can share a protective element, which can reduce installation steps and improve production efficiency.

[0073] In this way, while ensuring that the battery 1 has sufficient energy utilization, the thickness of each cell 200 can be reduced, the production yield of cell 200 is higher, and the production efficiency is improved.

[0074] like Figure 7 and Figure 8As shown, in some embodiments, the top cover 400 is provided with a first protrusion 410, which protrudes in a direction away from the battery cell 200 along a first direction. A first groove 420 is provided on the side of the first protrusion 410 facing the battery cell 200. The area projected onto the connecting portion 520 in the first direction is S5, and the groove area of ​​the first groove 420 is S6, where 1 ≤ S6 / S5 ≤ 1.5, and 60 mm. 2 ≤S5≤3720mm 2 64mm 2 ≤S6≤3844mm 2 .

[0075] Where S6 / S5 can be 1, 1.1, 1.2, 1.3, 1.4 or 1.5, and S5 can be 60mm. 2 90mm 2 200mm 2 350mm 2 600mm 2 800mm 2 1000mm 2 1500mm 2 2000mm 2 2400mm 2 3000mm 2 3500mm 2 Or 3720mm 2 The S6 can be 64mm. 2 100mm 2 225mm 2 400mm 2 625mm 2 900mm 2 1225mm 2 1600mm 2 2025mm 2 2500mm 2 3025mm 2 3600mm 2 Or 3844mm 2 .

[0076] By providing the first groove 420, the connecting part 520 can be accommodated, reducing the space occupied by the electrode post 500 in the receiving cavity 110. A larger battery cell 200 and electrolyte can be arranged in the receiving cavity 110, increasing the energy density of the battery 1. Furthermore, by providing the first protrusion 410, the thickness of the top cover 400 in the area where the first groove 420 is located is not excessively reduced while realizing the setting of the first groove 420, which helps to ensure the overall structural strength of the top cover 400.

[0077] By setting S6 / S5 to be no less than 1, it can be ensured that the first groove 420 can fully accommodate the connecting part 520, thus preventing the connecting part 520 from being unable to enter the first groove 420. By setting S6 / S5 to be no greater than 1.5, it can be ensured that the size of the first protrusion 410 is not too large, thereby reducing the processing and manufacturing difficulty of the first protrusion 410 and reducing costs, while also ensuring that the top cover 400 has a large structural strength.

[0078] In some embodiments not shown, the connecting portion 520 has a first center line in the third direction, and the top cover 400 has a second center line in the third direction; in the third direction, the central axis of the main body portion 510 is located on the side of the first center line away from the second center line.

[0079] In other words, the connecting part 520 and the main body part 510 are eccentrically arranged so that the main body part 510 and the tab 300 are offset in the third direction.

[0080] Battery 1 has two terminals 500, one terminal 500 is a positive terminal and the other terminal 500 is a negative terminal. When the connecting part 520 and the main body part 510 are eccentrically arranged, the distance between the main body parts 510 of the two terminals 500 in the third direction can be increased. The distance between the main body parts 510 of the two terminals 500 and the explosion-proof valve 600 is larger, which is beneficial to the electrical connection of battery 1 in the battery pack.

[0081] like Figure 7 and Figure 8 As shown, in some embodiments, the battery 1 further includes an insulating member 700, which is disposed between the terminal post 500 and the top cover 400. The main body 510 passes through the insulating member 700. The insulating member 700 is provided with a second protrusion 710, which protrudes in a direction away from the cell 200 along a first direction. The side of the second protrusion 710 facing the cell 200 is provided with a second groove 720. The second protrusion 710 is located in the first groove 420, and the connecting part 520 is located in the second groove 720.

[0082] Among them, the insulating component 700 can be injection molded from plastic material.

[0083] By setting the second protrusion 710 to cooperate with the first groove 420, the relative position between the top cover 400 and the insulating member 700 can be positioned. The second groove 720 accommodates the connecting part 520, which can abut against the bottom wall of the second groove 720. While realizing the positioning of the pole post 500, the insulating member 700 and the top cover 400, the space occupied by the pole post 500 in the receiving cavity 110 can be reduced. A larger cell 200 and electrolyte can be arranged in the receiving cavity 110, increasing the energy density of the battery 1.

[0084] The insulating component 700 has a support block 730 on the side facing the battery cell 200. Along the third direction, the minimum distance between the connecting part 520 and the support block 730 is H2, 5mm≤H2≤50mm, where H2 can be 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, 35mm, 38mm, 40mm, 42mm, 45mm, 48mm or 50mm.

[0085] The support block 730 can support the battery cell 200. There is a gap between the battery cell 200 and the insulating member 700 to define a space between the insulating member 700 and the battery cell 200 for the arrangement and connection of the tab 300 and the connecting part 520.

[0086] Since the tab 300 includes multiple tab pieces stacked together, these tab pieces may be misaligned in the third direction during the winding process. The size of the misalignment of the multiple tab pieces in the third direction is generally no more than 5mm. Therefore, by setting H2 to be no less than 5mm, when the tab 300 is connected to the pole post 500, even if the multiple tab pieces of the tab 300 are misaligned in the third direction, the tab 300 will not interfere with the support block 730, thus ensuring the rationality of the layout between the insulating component 700 and the tab 300.

[0087] An explosion-proof valve 600 is usually installed on the top cover 400. The explosion-proof valve 600 is located at the center of the top cover 400 in the third direction. By limiting H2 to no more than 50mm, the connection part 520 can be prevented from being too close to the second center line, thereby preventing interference between the connection part 520 and the explosion-proof valve 600. This is beneficial to the arrangement of the pole post 500 and the explosion-proof valve 600, and ensures the safety of the battery 1.

[0088] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0089] The present invention will now be described in detail with reference to specific embodiments, which are intended to understand rather than limit the present invention.

[0090] Table 1

[0091]

[0092] In Table 1, the parameters regarding the dimensions of the top cover in the second direction (W1), the dimensions of the connecting portion in the second direction (W2), and the dimension L1 of the tab 300 extending beyond the cell body 210 differ in the above embodiments and comparative examples, while other parameters are the same.

[0093] The relevant performance test results of the batteries in the above embodiments and comparative examples are recorded in Table 2. The test methods are described below:

[0094] The method for measuring the charging time of battery 1 in this utility model is as follows: At 25°C, the secondary battery prepared above is charged at a constant current of 0.33C to the charging cutoff voltage of 4.4V, then charged at a constant voltage to a current of 0.05C, left to stand for 5 minutes, and then discharged at a constant current of 0.33C to the discharge cutoff voltage of 2.8V. Its actual capacity is recorded as C0.

[0095] Then, the secondary battery was sequentially charged at a constant current of 0.5C0, 1C0, 1.5C0, 2C0, 2.5C0, 3C0, 3.5C0, 4C0, and 4.5C0 until the full battery charging cutoff voltage of 4.4V or the negative terminal cutoff potential of 0V (whichever comes first). After each charging, it was discharged at 1C0 until the full battery discharge cutoff voltage of 2.8V. The state of charge (SOC) was recorded at different charging rates until 10%, 20%, 30%...80%. The negative electrode potential corresponding to the state of charge (SOC) is plotted, and the rate-negative electrode potential curves under different SOC states are obtained after linear fitting. The charging rate corresponding to the negative electrode potential of 0V under different SOC states is obtained. This charging rate is the charging window under that SOC state, and is denoted as C10%SOC, C20%SOC, C30%SOC, C40%SOC, C50%SOC, C60%SOC, C70%SOC, and C80%SOC respectively. The charging time T of the secondary battery from 10%SOC to 80%SOC is calculated according to the formula (60 / C20%SOC+60 / C30%SOC+60 / C40%SOC+60 / C50%SOC+60 / C60%SOC+60 / C70%SOC+60 / C80%SOC)×10%.

[0096] The method for measuring the temperature rise of battery 1 during fast charging in this invention is as follows: The battery undergoes one charge-discharge cycle, similar to a fast charging cycle life test. A temperature sensing wire is used to measure and record the temperature rise of the large surface area of ​​the battery cell during this process.

[0097] Table 2

[0098]

[0099] According to the test results in Table 2, in Examples 1 and 6, 0.5≤W2 / W1<1 and 10mm≤L1≤30mm are satisfied. Therefore, the charging time is significantly shorter, the charging speed is faster, and the fast charging effect is better.

[0100] In Comparative Example 1, W2 / W1 is less than 0.5, which does not meet the above requirements. Therefore, the charging time is longer, the charging speed is slower, the temperature is higher during charging, and the safety is poor.

[0101] In Comparative Examples 2 and 3, L1 does not meet the above requirements. Although the charging speed is relatively fast, the temperature is high during charging, resulting in poor safety.

[0102] In summary, by comprehensively controlling W1, W2, and L1 to satisfy 0.5≤W2 / W1<1 and 10mm≤L1≤30mm, it is possible to shorten the charging time while maintaining a low charging temperature, thus improving charging safety and achieving the dual advantages of short charging time and low charging temperature.

[0103] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized by, The shell (100) is provided with a receiving cavity (110) and an opening (120) in communication with the receiving cavity (110), and the opening (120) is located at one end of the shell (100) in a first direction; The electric core (200) is arranged in the receiving cavity (110) and includes an electric core body (210) and a tab (300), the tab (300) is connected to a side of the electric core body (210) facing the opening (120), and the size of the tab (300) beyond the electric core body (210) is L1; The top cover (400) is connected with the shell (100) and covers the opening (120), the size of the top cover (400) in a second direction is W1, and the first direction and the second direction are arranged intersectingly; The pole (500) includes a main body part (510) and a connecting part (520), the main body part (510) is arranged through the top cover (400) and connected with the connecting part (520), the connecting part (520) is located at a side of the top cover (400) facing the electric core (200) and connected with the tab (300), and the size of the connecting part (520) in the second direction is W2; Wherein, 0.5≤W2 / W1<1, 10mm≤L1≤30mm. 26mm≤W1≤75mm, and / or, 5mm≤W2≤62mm.

2. The battery of claim 1, wherein, In the second direction, the distance between the connecting part (520) and the shell (100) is H1, 0.05≤H1 / L1≤3, 3mm≤H1≤30mm.

3. The battery of claim 1, wherein, The tab (300) and the connecting part (520) are welded and formed with a welding mark, the welding mark extends along a third direction, and the first direction, the second direction and the third direction are arranged intersectingly two by two; 4. The battery of claim 1, wherein, Along the third direction, the size of the connecting part (520) is L2, the size of the welding mark is L3, 1.1≤L2 / L3≤5, 12mm≤L2≤60mm, and 8mm≤L3≤45mm. The tab (300) and the pole (500) are welded by laser welding.

5. The battery of claim 4, wherein, In a thickness direction of the tab (300), a cross-sectional area of the tab (300) is S1, an area of the welding mark is S2, 0.3 ≤ S2 / S1 ≤ 3, 0.6 mm ≤ S1 ≤ 90 mm, 12 mm ≤ S2 ≤ 180 mm 2 . 2 . 2 . 2 .

6. The battery of claim 4, wherein, A cross-sectional area of the connection portion (520) perpendicular to the third direction is S3, an area of the weld is S2, 0.3 ≤ S2 / S3 ≤ 3, 4 mm 2 ≤ S3 ≤ 15 mm 2 .

7. The battery of claim 6, wherein, The area of the main body portion (510) projected in the first direction is S4, 0.3 ≤ S4 / S3 ≤ 3, 7.06 mm 2 ≤ S4 ≤ 452.17 mm 2 .

8. The battery of any one of claims 4-7, wherein, Further comprising:

9. The battery of claim 8, wherein, A protection member is arranged at a side of the tab (300) away from the connecting part (520) and covers the welding mark. The electric core (200) is two, the two electric cores (200) are arranged along the second direction, and the tabs (300) of the two electric cores (200) are connected to opposite sides of the connecting part (520) in the second direction.

10. The battery of any one of claims 1-7, wherein, The top cover (400) is provided with a first convex block (410), the first convex block (410) protrudes in a direction away from the electric core (200) along the first direction, and a first groove (420) is arranged at a side of the first convex block (410) facing the electric core (200); 11. The battery of any one of claims 1-7, wherein, The connecting part (520) has a first center line in a third direction, the top cover (400) has a second center line in the third direction, and the first direction, the second direction and the third direction are arranged intersectingly two by two; The area of the connecting portion (520) projected along the first direction is S5, the area of the slot opening of the first groove (420) is S6, 1≤S6 / S5≤1.5, 60mm 2 ≤S5≤3720mm 2 , 64mm 2 ≤S6≤3844mm 2 .

12. The battery of claim 11, wherein, ​ In the third direction, the center axis of the main body part (510) is located on the side away from the second center line relative to the first center line.

13. The battery of claim 12, wherein, Further comprising: An insulating piece (700) is arranged between the pole (500) and the top cover (400), the main body part (510) is arranged through the insulating piece (700), the insulating piece (700) is provided with a second convex (710), the second convex (710) protrudes away from the battery cell (200) along the first direction, the side of the second convex (710) facing the battery cell (200) is provided with a second groove (720), the second convex (710) is located in the first groove (420), and the connecting part (520) is located in the second groove (720); Wherein, the side of the insulating piece (700) facing the battery cell (200) is provided with a support block (730), and the minimum distance between the connecting part (520) and the support block (730) in the third direction is H2, 5mm≤H2≤50mm.

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