Single battery and battery device with same

Abstract

The invention relates to the technical field of batteries, and discloses a single battery and a battery device with the single battery, the single battery device comprises a shell and a battery cell, the end face of the shell is provided with a first protruding part, the first protruding part protrudes in the direction away from the battery cell, and the side, close to the battery cell, of the first protruding part is provided with a containing cavity; the battery cell comprises a body and a current output end electrically connected with the body, and at least part of the current output end is located in the accommodating cavity; the current output end is positioned at at least one end of the battery cell in the first direction, in the first direction, the height of the accommodating cavity is Hmm, and the size of the current output end extending into the accommodating cavity is Bmm; the first protruding part comprises a protruding bottom wall deviating from the battery cell and an opening part close to the battery cell, in the second direction, the size of the opening part is L1 mm, the size of the protruding bottom wall is L2 mm, L1-L2 = A, and A (H-B) is larger than or equal to 0.02 and smaller than or equal to 9.5. According to the technical scheme provided by the invention, the problem that heat between the battery cell and the shell is difficult to dissipate in time in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a single battery and a battery device having the same. BACKGROUND

[0002] Batteries are widely used in mobile devices, electric vehicles, energy storage systems, etc. With the development of technology, the energy density of batteries is continuously increasing, and the volume of batteries is continuously decreasing. The thermal management of the battery becomes more and more complex.

[0003] In the related art, the basic structure of a battery generally includes a cell and a shell. The cell is the core component of the battery, responsible for energy storage and release, while the shell protects the cell from external environmental influences.

[0004] However, when the battery is in a high-power charging and discharging process, the cell generates a large amount of heat. In existing batteries, the distance between the cell and the shell is far apart, making it difficult for the heat between the cell and the shell to be dissipated in time, affecting the charging rate of the battery, and causing safety risks such as thermal runaway inside the battery. SUMMARY

[0005] The present application provides a single battery and a battery device having the same to solve the problem of heat dissipation between the cell and the shell in the related art.

[0006] According to one aspect of the present application, a single battery is provided, which includes a shell and a cell disposed in the shell. The end face of the shell is provided with a first protruding portion, which protrudes in a direction away from the cell. The side of the first protruding portion facing the cell has a receiving cavity. The cell includes a body and a current output end electrically connected to the body. At least part of the current output end is located in the receiving cavity. The current output end is located at least at one end in a first direction of the cell. In the first direction, the height of the receiving cavity is Hmm, and the size of the current output end extending into the receiving cavity is Bmm. The first protruding portion includes a protruding bottom wall away from the cell and an opening portion close to the cell. In a second direction perpendicular to the first direction, the size of the opening portion is L1mm, and the size of the protruding bottom wall is L2mm. L1-L2=A, 0.02≤A (H-B)≤9.5.

[0007] According to another aspect of the present application, a battery device is provided, which includes a single battery as described above.

[0008] The technical scheme of the present application can balance the battery heat dissipation effect and the assembly convenience of the cell and the shell. Specifically, the first protruding part is arranged on the end face of the shell, the first protruding part comprises a side wall and a bottom wall, and on the side facing the cell, the side wall and the bottom wall jointly form a containing cavity. By locating the current output end partially or entirely in the containing cavity, the distance between the cell and the end face of the shell can be significantly shortened, thereby enhancing the heat dissipation capacity of the cell, effectively improving the overall heat dissipation performance of the battery, avoiding the occurrence of internal thermal runaway of the battery, and improving the overall charging rate of the battery and reducing the overall internal resistance of the battery. Moreover, by setting the size of the opening part of the first protruding part close to the cell to be greater than the size of the protruding bottom wall of the cell, the subsequent assembly process is facilitated, the assembly precision of the cell and the shell is reduced, the safety risk of the current output end being torn at the root due to the extrusion of the shell is reduced, and the assembly efficiency and yield of the battery as a whole are improved. In the first direction, the height of the containing cavity is Hmm, the size of the current output end extending into the containing cavity is Bmm, in the second direction perpendicular to the first direction, the size of the opening part is L1mm, the size of the protruding bottom wall is L2mm, L1-L2=A, 0.02≤A (H-B)≤9.5. By limiting the value of A (H-B) to the range of 0.02 to 9.5, not only can the heat generated by the cell 20 be dissipated in time to avoid heat accumulation and affect the safety of the battery in use. At the same time, the risk of tearing of the current output end at the root due to poor positioning accuracy and extrusion stress can be avoided, and the balance between heat dissipation effect and assembly convenience can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0009] The drawings accompanying the specification of this application serve to provide a further understanding of the present application, the illustrative embodiments of the present application and their descriptions serve to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0010] Figure 1 A structural schematic diagram of a single battery provided by an embodiment of the present application is shown;

[0011] Figure 2 An exploded structural schematic diagram of a single battery provided by an embodiment of the present application is shown;

[0012] Figure 3 A sectional view of a single battery provided by an embodiment of the present application in the second direction is shown;

[0013] Figure 4 An enlarged structural schematic diagram of A of Figure 3 is shown;

[0014] Figure 5 Another enlarged structural schematic diagram of A of Figure 3 is shown;

[0015] Figure 6 A cross-sectional view of a single cell provided in an embodiment of the present invention is shown in a third-party direction;

[0016] Figure 7 It shows Figure 6 A magnified structural diagram at point B;

[0017] Figure 8 A schematic diagram of the structure of a single cell battery provided in an embodiment of the present invention in the second direction is shown;

[0018] Figure 9 A schematic diagram of the structure of a single cell battery provided in an embodiment of the present invention in the second direction is shown;

[0019] Figure 10 A schematic diagram of the structure of a single cell battery provided in an embodiment of the present invention in the second direction is shown;

[0020] Figure 11 This diagram illustrates the structure of a single battery cell provided in an embodiment of the present invention from a third-party perspective.

[0021] Figure 12 It shows Figure 11 A magnified structural diagram at point C;

[0022] Figure 13 A cross-sectional view of a single cell provided in another embodiment of the present invention is shown in a second direction;

[0023] Figure 14 It shows Figure 13 A magnified structural diagram at point D;

[0024] Figure 15 A schematic diagram of the structure of a single cell battery according to another embodiment of the present invention in the second direction is shown;

[0025] Figure 16 A schematic diagram of the structure of a single cell battery according to another embodiment of the present invention in the second direction is shown;

[0026] Figure 17 A schematic diagram of the structure of a single cell battery according to another embodiment of the present invention in the second direction is shown;

[0027] Figure 18 A schematic diagram of the structure of a single cell battery according to another embodiment of the present invention in the second direction is shown;

[0028] Figure 19 A schematic diagram of another embodiment of the single-cell battery provided by the present invention is shown.

[0029] The above figures include the following reference numerals:

[0030] 10, housing; 11, first protrusion; 111, accommodating cavity; 112, protrusion bottom wall; 113, opening part;

[0031] 20, battery cell; 21, body; 22, current output terminal; 221, tab;

[0032] 30, adapter piece;

[0033] 40, insulating piece; 41, second protrusion; 42, insulating plate body;

[0034] 50, pole;

[0035] 60, first connection point; 61, first bending point; 62, second connection point; 63, second bending point; 64, first welding mark; 65, first gap; 66, second gap; 67, second welding mark;

[0036] L1, size of opening part;

[0037] L2, size of protrusion bottom wall;

[0038] H, height of accommodating cavity;

[0039] B, size of current output terminal extending into accommodating cavity;

[0040] D, distance between edge of first protrusion and edge of housing;

[0041] N, length of side wall of first protrusion;

[0042] K1, minimum distance between first connection point and first bending point;

[0043] K2, minimum distance between first connection point and second connection point;

[0044] K3, distance between first connection point and tab;

[0045] K4, distance between end of tab extending into accommodating cavity and side wall of housing;

[0046] F1, size of first gap;

[0047] F2, size of second gap;

[0048] U, distance between second bending point and second connection point;

[0049] E, distance between two adjacent first welding marks;

[0050] N1, thickness of side wall of second protrusion;

[0051] N2, thickness of bottom wall of second protrusion;

[0052] Q, the distance between the second welding mark and the bending point of the tab;

[0053] Y, the distance between the pole and the first protruding part;

[0054] W1, the width of the tab;

[0055] W2, the width of the first protruding part;

[0056] G, the distance between the two staggered sections;

[0057] R3, the fillet radius of the third R angle. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0059] Research has found that the existing battery cell is difficult to quickly transfer heat to the battery shell, mainly because the tab lead-out end face of the battery cell occupies a certain height of the tab, resulting in too far distance between the end face of the battery cell and the shell, especially when the tab of the battery cell and the external current output terminal pole of the battery are electrically connected through the adapter piece, the sum of the height of the adapter piece and the height of the tab is large, which causes serious heat accumulation of the battery cell, affects the charge and discharge rate of the battery, and increases the safety risk of internal thermal runaway of the battery.

[0060] Therefore, the present scheme sets the first protruding part 11 on the end face of the battery shell 10, the side of the first protruding part 11 towards the battery cell 20 has a containing cavity 111, the tab 221 of the battery cell 20 and / or the adapter piece 30 is arranged in the containing cavity 111, so that the distance between the end face of the battery cell 20 and the end face of the shell 10 is closer, the heat transfer between the battery cell 20 and the shell 10 is improved, the overall heat transfer distance is shortened, and the overall space utilization rate of the battery shell is improved. However, during the assembly of placing the battery cell 20 or the adapter piece 30 in the first protruding part 11, due to the positioning deviation of the tooling, the tab 221 or the adapter piece 30 is prone to misassembly, causing the tab 221 or the adapter piece 30 to be extruded with the metal shell 10, causing the tab 221 or the adapter piece 30 to be broken, especially the thickness of the tab is generally thin, usually about 4-16 μm, after the tab 221 is torn, the current between the pole piece in the battery cell 20 and the tab 221 is difficult to transfer, causing the risk of internal and external current disconnection of the battery cell.

[0061] As Figures 1 to 12 shown, the embodiment of the present application provides a single battery, the single battery comprises a shell 10 and an electric core 20 arranged in the shell 10, the end face of the shell 10 is provided with a first protruding part 11, the first protruding part 11 protrudes towards the direction away from the electric core 20, the side of the first protruding part 11 close to the electric core 20 has a containing cavity 111, the electric core 20 comprises a body 21 and a current output end 22 arranged on the body 21, at least part of the current output end 22 is located in the containing cavity 111. The current output end 22 is led out along a first direction, in the first direction, the height of the containing cavity 111 is Hmm, and the size of the current output end 22 extending into the containing cavity 111 is Bmm. The first protruding part 11 comprises a protruding bottom wall 112 away from the electric core 20 and an opening part 113 close to the electric core 20, in a second direction perpendicular to the first direction, the size of the opening part 113 is L1mm, the size of the protruding bottom wall 112 is L2mm, L1-L2=A, 0.02≤A (H-B)≤9.5.

[0062] In the embodiment, the end face of the shell 10 is provided with the first protruding part 11, the first protruding part 11 comprises a side wall and a bottom wall, on the side towards the electric core 20, the side wall and the bottom wall jointly enclose the containing cavity 111, by locating part or all of the current output end 22 in the containing cavity 111, the distance between the electric core 20 and the end face of the shell 10 can be significantly shortened, so that the heat of the electric core 20 can be more quickly conducted to the shell 10, and then dissipated to the external environment by the shell 10, thereby enhancing the heat dissipation capacity of the electric core 20, ensuring the rapid release of heat inside the battery, effectively improving the overall heat dissipation performance of the battery, avoiding the occurrence of thermal runaway inside the battery, and at the same time improving the overall charging rate of the battery and reducing the overall internal resistance inside the battery.

[0063] Further, by containing the current output end 22 inside the first protruding part 11 of the shell 10, the heat dissipation rate of the current output end 22 on the electric core 20 can be effectively improved. However, it is found through research that it is difficult to accurately position the current output end 22 and the first protruding part 11 during assembly, and after mispositioning during assembly of the current output end 22 and the first protruding part 11, other parts of the shell 10 and the first protruding part 11 will extrude the current output end 22. After the current output end 22 is extruded, if the battery vibrates, the root of the current output end 22 and the electric core 20 are prone to tearing, which may cause the risk of open circuit of the current inside the battery.

[0064] In the embodiment, by setting the size of the first protruding portion 11 close to the opening portion 113 of the battery cell 20 to be larger than the protruding bottom wall 112 of the battery cell 20, the subsequent assembly process is facilitated, the assembly accuracy of the battery cell 20 and the shell 10 is reduced, the safety risk of the shell 10 extruding the current output end 22 to cause the root of the current output end 22 to be torn is reduced, and the assembly efficiency and yield of the battery as a whole are improved. The current output end 22 is led out in a first direction. In the first direction, the height of the accommodating cavity 111 is Hmm, the size of the current output end 22 extending into the accommodating cavity 111 is Bmm, in a second direction perpendicular to the first direction, the size of the opening portion 113 is L1mm, the size of the protruding bottom wall 112 is L2mm, L1-L2=A, 0.02≤A (H-B)≤9.5. If A The formula value of (H-B) is too small, that is, A and / or (H-B) is too small. When A is too small, the current output end 22 is subject to a difference in position, and the root of the current output end 22 is easily torn by extrusion. When (H-B) is too small, the root of the current output end 22 is too close to the opening, the shell 10 around the first protruding portion 11 is too close to the root of the current output end 22, the current output end 22 installed inside the first protruding portion 11 has poor positioning accuracy, and the risk of tearing the root of the current output end 22 is increased. If the formula value is too large, that is, Amm and / or (H-B) is too large, when Amm is too large, the current output end 22 is too far from the end face of the shell 10, the heat dissipation efficiency and speed of the battery cell 20 are low, and when (H-B) is too large, the current output end 22 is too far from the end face of the shell 10, which also affects heat dissipation of the battery cell 20. In the embodiment, A (H-B) is limited to a range of 0.02 to 9.5, which not only ensures that the heat generated by the battery cell 20 is dissipated in time to avoid heat accumulation and affect the safety of the battery. At the same time, it can avoid poor positioning accuracy of the current output end 22 and the risk of tearing the root of the current output end 22 due to extrusion stress, and achieve a balance between heat dissipation effect and assembly convenience.

[0065] In the embodiment, the current output end 22 can be a tab 221 led out from the battery cell body 21, or a conversion sheet 30.

[0066] It should be noted that, as Figure 1 shown, the first direction is the height direction of the single battery, the second direction is the width direction of the end face of the shell 10 provided with the first protruding portion 11, and is perpendicular to the first direction, and the third direction is the length direction of the end face of the first protruding portion 11, and is perpendicular to the first direction and the second direction.

[0067] A (H-B) is 0.02, 1.5, 3.5, 5, 7.5, 9.5, and other values between 0.02 and 9.5.

[0068] As shown in Figure 11 In the third direction perpendicular to the first direction and the second direction, the distance between the edge of the first protruding part 11 and the edge of the shell 10 is Dmm, 10mm≤Dmm≤100mm. By setting Dmm in the range of 10mm to 100mm, the structural stability of the first protruding part 11 and the heat dissipation performance of the battery are effectively balanced. If the distance is too close, there is a risk of affecting the structural stability; if the distance is too far, the size of the first protruding part is limited, resulting in limited tab size, reduced heat dissipation efficiency, and possible high internal battery temperature, which may cause safety risks. Through reasonable Dmm design, the heat dissipation efficiency can be improved while ensuring compact battery structure, enhancing the safety and reliability of the battery.

[0069] Wherein, Dmm can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm and other values between 10mm and 100mm.

[0070] In the second direction, the distance between the edge of the first protruding part 11 and the edge of the shell 10 is in the range of 1.5~5mm. If the distance is too close, there is a risk of affecting the structural stability; if the distance is too far, the size of the first protruding part is limited, resulting in limited tab size, reduced heat dissipation efficiency, and possible high internal battery temperature, which may cause safety risks.

[0071] In this embodiment, the side wall of the first protruding part 11 and the end face of the shell 10 have a first R angle, and the fillet radius of the first R angle is R1mm, 0.2mm≤R1mm≤5mm. On the one hand, the setting of the first R angle can effectively balance the stress concentration at the connection between the first protruding part 11 and the shell 10, and can realize better heat conduction path without occupying too much space, which helps to improve the heat dissipation efficiency and avoid local overheating of the battery. On the other hand, the smaller the first R angle, the worse the alignment accuracy of the current output end 22 and the inside of the first protruding part 11, increasing the risk of tearing of the current output end 22. The larger the first R angle, the farther the distance between the battery cell 20 and the shell 10, and the worse the battery heat dissipation performance. By controlling the fillet radius of the first R angle to be between 0.2mm and 5mm, the balance between the heat dissipation efficiency of the battery and the alignment accuracy of the current output end 22 and the first protruding part 11 can be realized on the premise of ensuring the connection strength of the first protruding part 11 and the shell 10.

[0072] In the present embodiment, the included angle between the side wall of the first protruding portion 11 and the end face of the shell 10 is C1°, and 50°≤C1°≤85°. When the included angle C1° is in the range of 50° to 85°, the connection between the side wall of the first protruding portion 11 and the end face of the shell 10 is relatively gentle, which helps to disperse stress and reduce stress concentration, thereby improving the stability and durability of the battery structure. At the same time, the range of the included angle C1° increases the convenience during assembly, which can provide more space for the assembly process of the current output end 22 and the first protruding portion 11, reduce the assembly difficulty, improve the assembly efficiency, and also reduce the risk of tearing of the root of the current output end 22 due to extrusion stress caused by inaccurate assembly.

[0073] In the present embodiment, the included angle between the side wall of the first protruding portion 11 and the end face of the shell 10 is C1°, and 50°≤C1°≤85°. When the included angle C1° is in the range of 50° to 85°, the connection between the side wall of the first protruding portion 11 and the end face of the shell 10 is relatively gentle, which helps to disperse stress and reduce stress concentration, thereby improving the stability and durability of the battery structure. At the same time, the range of the included angle C1° increases the convenience during assembly, which can provide more space for the assembly process of the current output end 22 and the first protruding portion 11, reduce the assembly difficulty, improve the assembly efficiency, and also reduce the risk of tearing of the root of the current output end 22 due to extrusion stress caused by inaccurate assembly.

[0074] In the present embodiment, the included angle between the side wall of the first protruding portion 11 and the end face of the shell 10 is C1°, and 50°≤C1°≤85°. When the included angle C1° is in the range of 50° to 85°, the connection between the side wall of the first protruding portion 11 and the end face of the shell 10 is relatively gentle, which helps to disperse stress and reduce stress concentration, thereby improving the stability and durability of the battery structure. At the same time, the range of the included angle C1° increases the convenience during assembly, which can provide more space for the assembly process of the current output end 22 and the first protruding portion 11, reduce the assembly difficulty, improve the assembly efficiency, and also reduce the risk of tearing of the root of the current output end 22 due to extrusion stress caused by inaccurate assembly.

[0075] In the present embodiment, the included angle between the side wall of the first protruding portion 11 and the end face of the shell 10 is C1°, and 50°≤C1°≤85°. When the included angle C1° is in the range of 50° to 85°, the connection between the side wall of the first protruding portion 11 and the end face of the shell 10 is relatively gentle, which helps to disperse stress and reduce stress concentration, thereby improving the stability and durability of the battery structure. At the same time, the range of the included angle C1° increases the convenience during assembly, which can provide more space for the assembly process of the current output end 22 and the first protruding portion 11, reduce the assembly difficulty, improve the assembly efficiency, and also reduce the risk of tearing of the root of the current output end 22 due to extrusion stress caused by inaccurate assembly.

[0076] As shown in Figure 11 the length of the side wall of the first protruding part 11 is Nmm, and 1.04≤N / H≤1.5. The length of N determines the support range of the side wall of the first protruding part 11, and limiting the ratio of the length N of the side wall of the first protruding part 11 to the height H of the accommodating cavity 111 to 1.04-1.5 can guarantee the structural stability of the first protruding part 11, reduce the stress concentration phenomenon of the first protruding part 11, and make it not easy to be damaged when the battery is subjected to external impact or vibration. Secondly, the length of Nmm can also improve the assembly convenience of the current output end 22, and can provide a gentler channel for the current output end 22 to enter the accommodating cavity 111. Therefore, limiting the ratio of the length Nmm of the side wall of the first protruding part 11 to the height Hmm of the accommodating cavity 111 to 1.04-1.5 can balance the structural strength of the first protruding part 11, the heat dissipation efficiency of the battery cell 20, and the assembly performance of the current output end 22 and the accommodating cavity 111.

[0077] wherein Nmm can be 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, and other values between 0.3mm and 3mm, Hmm can be 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, and other values between 0.2mm and 2mm, and N / H can be 1.04, 1.10, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, and other values between 1.04 and 1.5.

[0078] As shown in Figure 2 , Figure 3 and Figure 18 In this embodiment, 0.2mm≤Amm≤5mm, and 0.1mm≤H-B≤1.9mm. The value of Amm formed between the side wall of the first protruding part 11 and the end face of the shell 10 in the monomer battery and the difference (H-B) between the depth of the current output end 22 extending into the accommodating cavity 111 and the height of the accommodating cavity 111 are set within a certain range, which can further balance the heat dissipation and assembly convenience, avoid excessive extrusion of the shell 10 on the current output end 22 during assembly, reduce the risk of damage to the current output end 22, while ensuring sufficient heat dissipation path, preventing heat accumulation inside the battery, and improving the safety and efficiency of the battery.

[0079] wherein Amm can be 0.2mm, 1.5mm, 2mm, 3.5mm, 4mm, 4.5mm, 5mm, and other values between 0.2mm and 5mm, and (H-B) can be 0.1mm, 0.5mm, 1.1mm, 1.5mm, 1.9mm, and other values between 0.1mm and 1.9mm.

[0080] AsFigure 9 In the present embodiment, 21mm≤L1mm≤60mm, L1 directly affects the assembly process of the current output terminal 22. If L1 is too small, it is not conducive to the alignment of the current output terminal 22 and the first protruding part 11, and when the battery is shaken, it can cause the current output terminal 22 to be squeezed or collided with the shell 10, causing the root of the current output terminal 22 to tear. If L1mm is too large, although it is easy to assemble, it can affect the heat dissipation performance. 16mm≤L2mm≤59.8mm, L2 is the size of the protruding bottom wall 112, the difference between L2mm and the opening L1mm is also important for assembly and heat dissipation. 0.2mm≤Hmm≤2.0mm, 0.1mm≤Bmm≤0.9mm. The height of the accommodating cavity 111 is Hmm, and the size of the current output terminal 22 extending into the accommodating cavity 111 is Bmm. The relationship between Hmm and Bmm determines the arrangement of the current output terminal 22 in the accommodating cavity 111 and its thermal contact area with the shell 10. If the difference between Hmm and Bmm is too small, the current output terminal 22 will directly contact the shell 10, increasing the risk of the current output terminal 22 being squeezed when the battery is stressed; while the difference is too large, it will reduce the heat dissipation efficiency, because the increased space of air or non-thermal conductive material hinders the direct transfer of heat from the battery cell 20 to the shell 10. By controlling the range of the above parameters, the compactness and space efficiency of the internal structure can be achieved while providing sufficient heat dissipation paths and ensuring that the current output terminal 22 can be smoothly installed without damage.

[0081] Wherein, L1mm can be 21mm, 30mm, 35mm, 40mm, 45mm, 55mm, 60mm and other values between 21mm and 60mm, L2mm can be 16mm, 20mm, 35mm, 40mm, 50mm, 59.8mm and other values between 16mm and 59.8mm, Hmm can be 0.2mm, 0.5mm, 0.8mm, 1.1mm, 1.4mm, 1.8mm, 2mm and other values between 0.2mm and 2.0mm, Bmm can be 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm and other values between 0.1mm and 0.9mm.

[0082] As Figure 15 and Figure 16As shown, the connection between the side wall of the first protruding part 11 and the end face of the shell 10 is a first connection point 60, the current output end 22 includes a tab 221, the tab 221 has a first bending point 61 in the accommodation cavity 111, and the minimum distance between the first connection point 60 and the first bending point 61 is K1mm, 0.4mm≤K1mm≤10mm. By setting the range of K1mm, the layout of the current output end 22 in the accommodation cavity 111 is ensured to neither be too compact to cause potential tearing risk nor be too loose to cause heat dissipation efficiency to decrease, balancing the assembly convenience of the battery cell 20 and the stability of the current output end 22, helping to maintain the integrity of the internal structure of the battery, while optimizing the heat dissipation performance and reducing the internal safety hidden danger caused by high temperature.

[0083] wherein K1 can be 0.4mm, 2mm, 4mm, 6mm, 8mm, 10mm, and other values between 0.4mm and 10mm.

[0084] As shown in Figure 15 and Figure 16 the connection between the side wall of the first protruding part 11 and the end face of the shell 10 is a first connection point 60, the connection between the current output end 22 and the battery cell 20 is a second connection point 62, and the minimum distance between the first connection point 60 and the second connection point 62 is K2mm, 0.01mm≤K2mm≤8mm. If K2mm is too small, the connection between the current output end 22 and the battery cell 20 is directly close to the first connection point 60, and when the battery is subjected to external impact, the deformation or stress change of the shell 10 near the first connection point 60 will be directly transmitted to the connection between the current output end 22 and the battery cell 20, increasing the risk of tearing. On the contrary, if K2mm is too large, the length of the current output end 22 increases, which may occupy more internal space, affecting the layout of the battery cell 20 and other components, and reducing the overall energy density of the battery. Controlling the minimum distance between the first connection point 60 and the second connection point 62 within the range of 0.01mm to 8mm makes the connection between the current output end 22 and the battery cell 20 have enough buffer space to resist external impact and internal stress change, reducing the risk of tearing.

[0085] wherein K2mm can be 0.01mm, 1.5mm, 3mm, 4.5mm, 6mm, 7.5mm, 8mm, and other values between 0.01mm and 8mm.

[0086] As shown in Figure 16As shown, the first connecting point 60 is the connection between the side wall of the first protruding part 11 and the end face of the shell 10, and the current output end 22 includes a tab 221. In the second direction, the distance between the first connecting point 60 and the tab 221 is K3mm, and 0.4mm≤K3mm≤1.5mm. If the minimum distance K3mm between the tab 221 and the shell 10 is too small, the possibility of interference between the tab 221 and the shell 10 will increase, and the tab 221 is likely to contact the shell 10 when the battery is subjected to external force, causing the risk of short circuit or tearing of the tab 221. In addition, the close layout of the tab 221 will also affect the natural dissipation of heat, thereby reducing the heat dissipation efficiency of the battery, causing local resistance to increase and heat. On the contrary, if K3mm is too large, the tab 221 needs to be bent or adjusted in a larger range, increasing the assembly difficulty, and may also cause the tab 221 to be damaged due to excessive bending, affecting the electrical performance and reliability of the battery. By setting the distance between the first connecting point 60 and the tab 221 to be between 0.4mm and 1.5mm, the stability of the battery structure can be ensured while ensuring the heat dissipation efficiency of the battery.

[0087] K3mm can be 0.4mm, 0.6mm, 0.8mm, 1.1mm, 1.3mm, 1.5mm, or other values between 0.4mm and 1.5mm.

[0088] As shown, Figure 16 the current output end 22 includes a tab 221. In the second direction, the distance between the end of the tab 221 extending into the accommodating cavity 111 and the side wall of the shell 10 is K4mm, and 0.4mm≤K4mm≤8mm. By setting K4mm to be within the range of 0.4mm to 8mm, it can be avoided that the tab 221 touches the shell 10 when the battery is subjected to vibration or impact, thereby causing the risk of internal short circuit, while also ensuring that the distance is not too far, ensuring that there is enough airflow space inside the accommodating cavity 111, promoting the conduction of heat from the battery cell 20 to the shell 10 and the dissipation of heat from the shell 10 to the outside, keeping the battery within the normal working temperature range, and avoiding the risk of thermal runaway.

[0089] K4mm can be 0.4mm, 2mm, 4mm, 6mm, 8mm, or other values between 0.4mm and 8mm.

[0090] As shown, Figure 13 and Figure 14As shown, the current output terminal 22 includes a tab 221, and the single battery cell also includes an adapter plate 30 and a terminal post 50. The terminal post 50 is fixed to the housing 10. The tab 221 is electrically connected to the terminal post 50 through the adapter plate 30. The tab 221 is led out from the cell 20 and bent to the side of the adapter plate 30 away from the cell 20 and welded to the adapter plate 30. The thickness is 0.5mm ≤ Amm ≤ 5mm. In this embodiment, the tab 221 is located on the upper part of the adapter plate 30 to avoid the tab 221 from overlapping and bending, resulting in a large overall thickness. This effectively shortens the distance between the cell 20 and the end face of the housing 10, thereby accelerating the heat dissipation process of the cell 20 and ensuring that the battery can maintain good thermal stability during charging and discharging. By connecting the tab 221 to the adapter 30 and controlling the value of Amm between 0.5mm and 5mm, the assembly of the current output terminal 22 is simplified, the risk of tearing at the root of the current output terminal 22 during the assembly process is reduced, and the internal space layout of the battery is optimized, improving space utilization and overall battery performance.

[0091] Where Amm can be 0.5mm, 1.5mm, 3mm, 4.5mm, 5mm, or other values ​​between 0.5mm and 5mm.

[0092] like Figure 17 As shown, in the second direction, there is a first gap 65 between the tab 221 and the adapter plate 30. The size of the first gap 65 is F1mm, where 0.1mm ≤ F1mm ≤ 1.5mm. This structure ensures that when the tab 221 is connected to the adapter plate 30, even if the battery is subjected to vibration or thermal expansion and contraction during use, a sufficient gap can still be maintained between the tab 221 and the adapter plate 30. This avoids mechanical damage or degradation of electrical performance due to excessive contact. After the tab 221 is positioned on the upper part of the adapter plate 30, stress concentration occurs at the bending point of the tab 221, making it easy for the metal adapter plate 30 to cut the tab 221, increasing the risk of tearing. Simultaneously, the aforementioned gap also aids in heat dissipation, ensuring the stability and safety of the battery under various operating conditions. The reasonable selection of the F1mm range ensures a reliable connection between the tab 221 and the adapter plate 30 while avoiding excessive compression, thus achieving stability of the battery's internal structure.

[0093] F1mm can be 0.1mm, 0.4mm, 0.7mm, 1mm, 1.3mm, 1.5mm, or other values ​​between 0.1mm and 1.5mm.

[0094] like Figures 2 to 7As shown, the current output end 22 includes a tab 221, and the single battery further includes a transition plate 30, the tab 221 is located on the side of the transition plate 30 facing the battery cell 20 and connected with the transition plate 30, the tab 221 is folded and overlapped to be arranged at the lower part of the transition plate 30, i.e. between the battery cell 20 and the transition plate 30, so that the distance between the end face of the battery cell and the end face of the shell 10 is far, and at least part of the transition plate 30 is located in the accommodating cavity 111, 0.1mm≤H-B≤1.7mm, the above arrangement can shorten the distance between the transition plate 30 and the convex bottom wall 112, so that the battery cell 20 can quickly transfer heat to the battery shell 10 for heat dissipation.

[0095] Wherein, H-B can be 0.1mm, 0.5mm, 0.7mm, 1mm, 1.3mm, 1.7mm and other values between 0.1mm and 1.7mm.

[0096] As shown, Figure 8 The tab 221 has an overlapping area formed by folding, the folding part of the tab 221 is a second folding point 63, the connection part of the tab 221 with the battery cell 20 is a second connection point 62, and the distance between the second folding point 63 and the second connection point 62 is Umm, 3mm≤Umm≤15mm. The overlapping area formed by the folding of the tab 221 can enhance the reliability of electrical connection, when the distance Umm between the second folding point 63 and the second connection point 62 is set within a reasonable range, the overlapping area of the tab 221 can provide larger contact area and more stable electrical connection, thereby reducing contact resistance and improving current transmission efficiency. If Umm is too small, the formation of the overlapping area may be insufficient, which cannot provide sufficient electrical connection strength, resulting in rising contact resistance and heat generation, affecting the performance of the battery; on the contrary, if Umm is too large, although the stability of the electrical connection can be ensured, the total length and complexity of the tab 221 will be increased, and the energy density of the battery cell 20 will be reduced. The appropriate Umm value can provide sufficient support for the folded part of the tab 221, so that it is not easy to deform or break when bearing stress, and the folding of the tab 221 can play a certain buffering role when the battery receives external impact, protecting the electrical connection between the tab 221 and the battery cell 20 from being damaged.

[0097] Wherein, Umm can be 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm and other values between 3mm and 15mm.

[0098] As shown, Figure 11 and Figure 12As shown, the current output end 22 includes a tab 221 connected with the pole piece of the battery cell 20, and has a staggered section in a third direction perpendicular to the first and second directions, with a distance Gmm between the staggered sections, Gmm≤2.5mm. The tab 221 includes a plurality of tab pieces, which are laminated and pinched to form the tab 221. In the third direction, i.e., the direction perpendicular to the direction in which the tab 221 is drawn out, the ends of the plurality of tab pieces are staggered. By controlling the size of the staggered section, the staggered section is prevented from being too large, which would cause the overall width of the tab 221 to be too large, and the tab 221 to be accommodated in the first protruding portion 11, causing the overall width of the tab 221 to be greater than the width of the accommodation cavity 111, resulting in interference when the tab 221 of the battery cell is installed into the first protruding portion 11, and the ends of the tab 221 being squeezed, causing the tab 221 to have a risk of tearing. Therefore, by controlling the distance between the staggered sections to be Gmm, i.e., the distance between the ends of the two farthest tab pieces at the same end of the tab 221 is Gmm≤2.5mm, the risk of the battery cell assembly efficiency being low due to the staggered tab 221 is avoided.

[0099] It should be noted that the pole piece includes a current collector and an active material layer provided on at least one surface of the current collector, and the area of the current collector without the active material layer is drawn out from the battery cell as the tab 221. The tab 221 includes a plurality of tab pieces, which are connected to a plurality of pole pieces, respectively, and are pinched to form the tab 221. The plurality of tab pieces can be electrically connected by riveting, welding, or the like. The staggered section is formed by the plurality of tab pieces being staggered during stacking, and in the third direction, the distance of the staggered section is the distance between the farthest tab piece and the nearest tab piece during stacking.

[0100] As shown in Figure 1 and Figure 7 The single battery includes at least two battery cells 20, and the current output ends 22 of the at least two battery cells 20 are located in the accommodation cavity 111. By placing the current output ends 22 of the plurality of battery cells 20 in the same accommodation cavity 111, the electrical connection structure can be simplified, the number of connecting pieces can be reduced, the battery assembly time and cost can be reduced, and the current transmission rate between adjacent battery cells can be improved. Furthermore, the accommodation cavity 111 can accommodate a plurality of battery cells 20 in a limited volume, improving the space utilization of the battery and effectively improving the energy density of the single battery.

[0101] As shown in Figure 2As shown, the current output end 22 includes a tab 221, and the single battery further includes a transition piece 30, the tabs 221 of the at least two battery cells are welded on the same transition piece 30 and are respectively formed with two first welds 64, the distance between the adjacent two first welds 64 is Emm, 8mm≤Emm≤64mm. In the embodiment, the same transition piece 30 is welded and connected with the tabs 221 of the two battery cells 20 respectively, and the welding of the tabs 221 on the transition piece 30 can reduce the welding cost, reduce the electrical connection points between the battery cells, and reduce the total resistance of the connection points. The distance between the adjacent two first welds 64 is set to 8mm to 64mm to ensure that there is enough space between the adjacent first welds 64 to avoid interference while welding is concentrated, and at the same time, it can be ensured that the adjacent welds are not too dense, avoiding the phenomenon of local overheating, causing the insulation piece 40 between the transition piece 30 and the shell 10 to melt or the structure of the transition piece 30 to fail, prolonging the service life of the battery.

[0102] Wherein, Emm can be 8mm, 16mm, 24mm, 32mm, 40mm, 48mm, 56mm, 64mm and other values between 8mm and 64mm.

[0103] In the embodiment, in the first direction, the distance between the end of the outermost pole piece in the body 21 and the end face of the shell 10 provided with the first protruding part 11 is Tmm, 4mm≤Tmm≤8.5mm. Avoiding the end of the outermost pole piece being too close to the first protruding part 11, causing a short circuit safety risk of the battery cell 20 and the shell 10 existing lap joint; the distance between the two is too far, and the battery cell 20 is difficult to transmit the internal heat to the shell 10, the internal heat of the battery shell 10 accumulates, and the safety risk of the battery fire and explosion is caused.

[0104] Wherein, Tmm can be 4mm, 5mm, 6mm, 7mm, 8mm, 8.5mm and other values between 4mm and 8.5mm.

[0105] As shown, Figure 2 The single battery further includes an insulation piece 40, the insulation piece 40 is located between the current output end 22 and the first protruding part 11, the insulation piece 40 includes an insulation plate body 42 and a second protruding part 41 provided on the insulation plate body 42, at least part of the second protruding part 41 is located in the accommodating cavity 111, the thickness of the side wall of the second protruding part 41 is N1mm, 0.4mm≤N1mm≤1.2mm, the thickness of the bottom wall of the second protruding part 41 is N2mm, 0.4mm≤N2mm≤1mm.

[0106] In the embodiment, the insulation piece 40 is arranged between the current output end 22 and the first protruding part 11, and the insulation piece 40 comprises an insulation plate body 42 and a second protruding part 41 arranged on the insulation plate body 42, and the second protruding part 41 is located between the first protruding part 11 and the current output end 22, thereby effectively preventing the current output end 22 from directly contacting the shell 10, forming effective physical isolation and electrical isolation. By setting the thickness of the side wall and the bottom wall of the second protruding part 41 within a reasonable range, sufficient structural strength can be provided. If N1mm and N2mm are set too small, the structural strength of the second protruding part 41 will be reduced, and deformation or damage may occur during the production and use of the battery, affecting the durability and safety of the battery. Conversely, if N1mm and N2mm are set too large, material will be wasted, increasing the manufacturing cost of the insulation piece 40. Moreover, reasonable setting of the thickness of the side wall and the bottom wall of the second protruding part 41 can ensure that a sufficient insulation distance is formed between the current output end 22 and the shell 10, preventing electrical short circuit, and under the high temperature and high pressure environment inside the battery, ensuring that the thickness of the second protruding part 41 is sufficient to provide long-term stable electrical isolation.

[0107] wherein N1mm can be 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, and other values between 0.4mm and 1.2mm, and N2mm can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, and other values between 0.4mm and 1mm.

[0108] In the embodiment, the elastic modulus of the insulation piece 40 is EGPa, and EGPa≤10Gpa. During assembly, the flexible insulation piece 40 can better adapt to the slight displacement between the current output end 22 and the first protruding part 11, effectively buffering the extrusion of the shell 10 and the electrode core 20 during assembly, thereby reducing the risk of tearing at the root of the tab 221.

[0109] In the embodiment, the side wall of the second protruding part 41 and the insulation plate body 42 have a third R angle, and the radius of the third R angle is R3mm, 0.5mm≤R3mm≤4mm. The setting of the third R angle can form a smooth transition at the connection between the side wall of the second protruding part 41 and the insulation plate body 42, avoiding stress concentration at the connection, thereby enhancing the structural strength and durability of the insulation piece 40 at this part. Reasonable radius R3mm further ensures the stability and durability of the structure, while improving the distribution of heat flow at the connection between the bottom wall and the side wall, reducing local overheating, reducing the risk of thermal deformation of the insulation piece 40 caused by high temperature, and maintaining long-term insulation effect.

[0110] Wherein, R3mm can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm and other values between 0.5mm and 4mm.

[0111] As shown in Figure 17 , the first protruding part 11 and the second protruding part 41 have a second gap 66 between them, the size of the second gap 66 is F2mm, 0.1mm≤F2mm≤1mm. The second protruding part 41 is between the first protruding part 11 and the current output end 22. By setting the second gap 66 and limiting the second gap 66 within the range of 0.1mm to 1mm, it can ensure that there is enough gap between the second protruding part 41 and the first protruding part 11 of the shell 10, thereby forming effective electrical isolation and avoiding the risk of short circuit between the battery cell 20 and the battery shell 10, improving the safety performance of the battery. On the other hand, by precisely controlling the range of F2mm, the limited space inside the battery shell 10 can be maximized, optimizing the spatial layout inside the battery and improving the energy density of the battery.

[0112] Wherein, F2mm can be 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1mm and other values between 0.1mm and 1mm.

[0113] As shown in Figures 1 to 7 , the single battery also includes a pole 50, the pole 50 is arranged on the protruding bottom wall 112, the pole 50 is electrically connected with the current output end 22, the cross-sectional area of the pole 50 is S1mm 2 , the area of the protruding bottom wall 112 is S2mm 2 , 0.01≤S1 / S2≤0.5. The pole 50 is an external electrical interface of the battery. By controlling the ratio of S1 / S2 within the range of 0.01 to 0.5, it can ensure that the pole 50 provides sufficient current channel, reduces current density, and reduces heat and resistance at the electrical contact, thereby improving the electrical efficiency and power output of the battery. And it can ensure that the connection between the pole 50 and the shell 10 is firm enough to withstand mechanical impact and vibration, avoid loosening or breaking during use or transportation, and ensure the stability of the battery structure.

[0114] Wherein, S1 can be 78.5mm 2 , 150mm 2 , 230mm 2 , 350mm 2 , 400mm 2 , 491mm 2 and other values between 78.5mm 2 and 491mm 2 , S2 can be 420mm 2 , 1500mm2 , 5000mm 2 , 10000mm 2 , 14000mm 2 , 16800mm 2 and 420mm 2 to 16800mm 2 Other values between S1 / S2 can be 0.01, 0.1, 0.2, 0.3, 0.4, 0.5 and other values between 0.01 and 0.5.

[0115] As shown in Figure 3 , the connection between the pole column 50 and the current output end 22 is a second welding mark 67, the current output end 22 includes a tab 221, and the single battery further includes a transition sheet 30, the tab 221 is bent to a side of the transition sheet 30 away from the battery cell 20 and is welded and connected with the transition sheet 30, the distance between the second welding mark 67 and the bending point of the tab 221 is Qmm, 10mm≤Qmm≤35mm, controlling the distance Qmm between the second welding mark 67 and the bending point of the tab 221 within a reasonable range can avoid that the distance between them is too close, when the whole battery is shaken, the amplitude of the pole column 50 is large, which causes stress concentration at the second welding mark 67, the bending point of the tab is subjected to a large pulling force, and there is a risk that the tab 221 is torn; the distance is too far, the current transmission path between the pole column 50 and the battery cell 20 is long, which affects the charging rate and internal resistance of the whole battery.

[0116] Wherein, Qmm can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm and other values between 10mm and 35mm.

[0117] As shown in Figure 11As shown, the single-cell battery also includes a terminal post 50. Both the terminal post 50 and the first protrusion 11 are disposed on the end face of the housing 10. The projections of the terminal post 50 and the first protrusion 11 on the end face do not coincide. The terminal post 50 is electrically connected to the current output terminal 22. The distance between the terminal post 50 and the first protrusion 11 is Y mm, where 5 mm ≤ Y mm ≤ 60 mm. By disposing both the terminal post 50 and the first protrusion 11 on the end face of the housing 10 and controlling the distance Y mm between them to be between 5 mm and 60 mm, a stable connection between the terminal post 50 and the current output terminal 22 can be ensured, reducing contact resistance. Simultaneously, unnecessary contact between the current output terminal 22 and the housing 10 or other components during assembly or use can be avoided, thereby reducing the risk of short circuits. If the distance is too small, it may cause collisions between the terminal post 50 and the housing 10 or other components when the battery is subjected to external impacts. If the distance is too large, the battery strength may be reduced due to a loose structure. Controlling Y mm to be between 5 mm and 60 mm can enhance the mechanical stability of the battery and reduce the risk of failure under various harsh conditions. Furthermore, a reasonable Ymm value can ensure sufficient space between the terminal 50 and the housing 10, which is conducive to the natural dissipation of internal heat, while avoiding a reduction in battery energy density due to wasted space.

[0118] Where Ymm can be 5mm, 15mm, 30mm, 45mm, 50mm, 60mm, or other values ​​between 5mm and 60mm.

[0119] like Figure 11 As shown, the current output terminal 22 includes a tab 221. In the third direction, the width of the tab 221 is W1mm, and the width of the first protrusion 11 is W2mm, where 1mm ≤ W2 - W1 ≤ 245mm. If the width difference is too small, under impact or vibration conditions, the risk of contact between the tab 221 and the first protrusion 11 increases. Other parts of the casing 10 and the first protrusion 11 will squeeze the tab 221, and the base of the tab 221 is prone to tearing, which may cause a break in the current inside the battery. If the width difference is too large, the distance between the tab 221 and the casing 10 will be too far, reducing the heat dissipation capacity of the cell 20. By precisely controlling the width difference between the first protrusion 11 and the tab 221, the structural stability of the tab 221 can be ensured while ensuring rapid heat release inside the battery, thereby effectively improving the overall heat dissipation performance of the battery and avoiding thermal runaway inside the battery.

[0120] It should be noted that W1 is the length of a single tab 221 in the third direction.

[0121] Wherein, W1 can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm and other values between 20mm and 50mm, W2 can be 21mm, 100mm, 150mm, 200mm, 250mm, 295mm and other values between 21mm and 295mm, W2-W1 can be 1mm, 50mm, 100mm, 150mm, 200mm, 245mm and other values between 1mm and 245mm.

[0122] As shown in Figure 19 In other embodiments, the first protruding part 11 is arranged on the end face of the battery shell 10 between the two polar posts 50.

[0123] Of course, the first protruding part 11 can be arranged one or two, when the number of the first protruding part 11 is one, the two polar posts 50 can be arranged on the protruding bottom wall of the first protruding part 11, or one polar post 50 and the first protruding part 11 on the end face of the shell 10 do not coincide in projection, or two polar posts 50 and the first protruding part 11 on the end face of the shell 10 do not coincide in projection, when the number of the first protruding part 11 is two, the two polar posts 50 can be arranged on the protruding bottom wall of one first protruding part 11, or one polar post 50 is arranged on the protruding bottom wall of one first protruding part 11, one polar post 50 and the first protruding part 11 on the end face of the shell 10 do not coincide in projection, or two polar posts 50 and the first protruding part 11 on the end face of the shell 10 do not coincide in projection.

[0124] Another embodiment of the present application provides a battery device, the battery device comprising a single battery, the single battery being the single battery provided above. The single battery can also solve the problem that heat between the battery cell and the shell is difficult to dissipate in time in the related art, which will not be repeated here.

[0125] The present application provides a test method for key parameters A, H, B and the tab, aiming to comprehensively evaluate the thermal management capability and mechanical reliability of the single battery, specifically:

[0126] Test method of A: discharge the battery to the lower limit voltage at 0.33C, then disassemble the battery, measure the length of the first protruding part 11 on the shell 10 near the side of the battery cell 20 in the second direction with a vernier caliper, record it as L1, and measure the length of the first protruding part 11 on the shell 10 away from the side of the battery cell 20 in the second direction with a vernier caliper, record it as L2, the unit of L1 and L2 is mm, calculate the value of A according to the formula A = L1-L2. When the positive active material is lithium iron phosphate, the upper limit voltage is 3.65V and the lower limit voltage is 2.5V; when the positive active material is lithium nickel cobalt manganese oxide, the upper limit voltage is 4.25V and the lower limit voltage is 2.75V; when the positive active material is lithium nickel manganese oxide, the upper limit voltage is 4.25V and the lower limit voltage is 2.5V; when the positive active material is lithium nickel manganese oxide, the upper limit voltage is 4.8V and the lower limit voltage is 3.5V.

[0127] Test method of H and B: discharge the battery to the lower limit voltage at 0.33C, then use an industrial CT scanner to perform computer tomography on the battery, measure the height of the accommodating cavity 111 of the first protruding part 11 in the first direction as H, and measure the height of the tab 221 located in the accommodating cavity 111 of the first protruding part 11 as B; the unit of H and B is mm. When the positive active material is lithium iron phosphate, the upper limit voltage is 3.65V and the lower limit voltage is 2.5V; when the positive active material is lithium nickel cobalt manganese oxide, the upper limit voltage is 4.25V and the lower limit voltage is 2.75V; when the positive active material is lithium nickel manganese oxide, the upper limit voltage is 4.25V and the lower limit voltage is 2.5V; when the positive active material is lithium nickel manganese oxide, the upper limit voltage is 4.8V and the lower limit voltage is 3.5V.

[0128] Tab tearing test method: 200 single battery cells are taken for each example and comparative example; the values of A, B and H in the battery cells of each example and comparative example are shown in Table 1, and the rest of the structure is the same; for each battery cell, place the battery cell on a vibration table, and under the working conditions of national standard GB38031-2020.8.2, Z / Y / X three directions random vibration and sinusoidal constant frequency vibration, each direction lasts for 12h of random vibration and 2h of sinusoidal constant frequency vibration. Then take out the single battery cell and disassemble it, observe whether the tab is torn, if there is tearing, count the number of tab tearing batteries; calculate the proportion of the number of tab tearing batteries in 200 batteries according to the formula (number of tab tearing batteries / 200) x 100%, if the proportion of the number of tab tearing batteries is greater than 10%, the tab tearing test is unqualified, if the proportion of the number of tab tearing batteries is less than or equal to 10%, the tab tearing test is qualified.

[0129] Pole tab temperature rise test method: under the condition of 25℃, connect the pole column with the temperature sensor, and charge the battery at a constant current with a rate of 4C until the voltage of the battery reaches the upper limit voltage, then switch to constant voltage charging until the current of the battery drops to 0.05C. Record the temperature change of the pole column during the whole charging process. If the maximum temperature T of the pole column is less than or equal to 45℃, the test result is considered qualified; if the maximum temperature T of the pole column is greater than 45℃, it is determined as unqualified. The upper and lower limit voltages need to be adjusted correspondingly for different positive electrode systems: when the positive electrode active material is lithium iron phosphate, the upper limit voltage is 3.65V and the lower limit voltage is 2.5V; when the positive electrode active material is lithium nickel cobalt manganese oxide, the upper limit voltage is 4.25V and the lower limit voltage is 2.75V; when the positive electrode active material is lithium nickel manganese oxide, the upper limit voltage is 4.25V and the lower limit voltage is 2.5V; when the positive electrode active material is lithium nickel manganese oxide, the upper limit voltage is 4.8V and the lower limit voltage is 3.5V. This test takes lithium iron phosphate as an example.

[0130] The example table is as follows:

[0131] Table 1 Performance test table

[0132]

[0133] From the above table, it can be seen that examples 1-10 are examples whose test parameters meet the value range defined in the application, and both performance tests meet the qualified standard. Against examples 1 and 2, the test results are unqualified.

[0134] Analysis of example 9 in the table shows that for this example, L1 and L2 are too small, resulting in a first protruding part with too small a length, and some pole tabs cannot be completely accommodated in the first protruding part, which affects the heat dissipation and tearing of the pole tab.

[0135] Analysis of example 10 in the table shows that for this example, L1 is too large, resulting in a first protruding part with a small edge distance from the end surface of the shell where the first protruding part is provided, which is prone to stress concentration and cracking.

[0136] Analysis of example 11 in the table shows that when the height of the first protruding part is out of range, it will affect the surface strength of the shell where the first protruding part is located, and the surface of the shell where the first protruding part is provided will be deformed due to the increase of internal pressure during thermal runaway or cycling.

[0137] The device provided by the example mainly has the following beneficial effects:

[0138] (1) The current output end 22 is at least partially arranged in the accommodating cavity 111 of the first protruding part 11, which reduces the distance between the battery cell 20 and the end face of the shell 10. This allows the heat generated by the battery cell 20 during charging and discharging to be quickly transferred to the shell 10 and dissipated to the environment through the shell 10, significantly improving the thermal management efficiency of the battery.

[0139] (2) By controlling the numerical range of A (H-B), not only is the current output end 22 prevented from being squeezed to tear when the battery is vibrating or subjected to external force, but the heat dissipation path of the current output end 22 inside the shell 10 is also ensured. This achieves a balance between heat dissipation effect and assembly convenience, avoids safety hazards caused by inaccurate assembly, while ensuring that the battery cell 20 can effectively dissipate heat and reducing the risk of internal thermal runaway caused by heat accumulation.

[0140] (3) Controlling the distance K1, K2 between the first connection point 60 (the connection between the side wall of the first protruding part 11 and the end face of the shell 10) and the first bending point 61, the second connection point 62 (the connection between the current output end 22 and the battery cell 20) can ensure the electrical isolation and mechanical stability of the current output end 22 inside the battery, avoiding direct contact between the current output end 22 and the shell 10, reducing the risk of electrical short circuit, while also preventing the current output end 22 from tearing in vibration, ensuring the safety of the battery under various use conditions.

[0141] (4) The addition of the insulating member 40 and its second protruding part 41 in the single battery cell can establish an insulating barrier between the current output end 22 and the shell 10. By precisely controlling the thickness N1mm, N2mm of the side wall and bottom wall of the second protruding part 41, not only is electrical isolation ensured to prevent short circuits, but also by optimizing the thermal resistance characteristics of the insulating material, an effective heat conduction path is established between the battery cell 20 and the shell 10, achieving effective electrical isolation and thermal management optimization between the current output end 22 and the shell 10.

[0142] The monomer battery in the present application is a secondary battery, also known as a rechargeable battery or a storage battery, which refers to a battery that can be activated by charging after discharging and continue to be used. Generally, a secondary battery device includes an electrode assembly, an electrolyte, and an outer packaging shell. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly and the electrolyte are assembled in the outer packaging shell. During the charging and discharging process of the battery, active ions (such as lithium ions) are inserted and extracted between the positive electrode sheet and the negative electrode sheet. The separator is arranged between the positive electrode sheet and the negative electrode sheet, mainly to prevent short circuiting of the positive and negative electrodes, and at the same time to allow the active ions to pass through. The electrolyte is between the positive electrode sheet and the negative electrode sheet, mainly to conduct the active ions. As an example, the preparation process of the secondary battery is as follows: the positive electrode sheet, the separator, and the negative electrode sheet are stacked in order, with the separator between the positive and negative electrode sheets to play a separating role, then the electrode assembly is obtained by winding or stacking; the electrode assembly is placed in the outer packaging shell, and after drying, the electrolyte is injected, and after vacuum packaging, standing, formation, shaping, and other processes, the secondary battery is obtained.

[0143] The preparation method of the monomer battery in the present application is as follows:

[0144] (1) Preparation of the positive electrode sheet:

[0145] The prepared positive electrode active material, conductive agent acetylene black, and binder PVDF are mixed, a solvent NMP is added, and stirring is performed under the action of a vacuum stirrer until the system is uniform, to obtain a positive electrode slurry; the positive electrode slurry is uniformly coated on both surfaces of the positive electrode current collector aluminum foil, and after drying at room temperature, it is transferred to an oven for further drying, and then cold pressing and cutting are performed to obtain the positive electrode sheet. Specifically, the mass ratio of the positive electrode active material: conductive agent: binder satisfies (92-98):(4-1):(4-1).

[0146] (2) Preparation of the negative electrode sheet:

[0147] The negative electrode active material, conductive agent acetylene black, thickening agent CMC, and binder SBR are mixed, a solvent deionized water is added, and stirring is performed under the action of a vacuum stirrer until the system is uniform, to obtain a negative electrode slurry; the negative electrode slurry is uniformly coated on both surfaces of the negative electrode current collector copper foil, and after drying at room temperature, it is transferred to an oven for further drying, and then cold pressing and cutting are performed to obtain the negative electrode sheet. The ratio of the negative electrode active material: conductive agent: thickening agent: binder satisfies (90-96):(4-2):(2-1):(4-1).

[0148] (3) Preparation of the electrolyte: ethylene carbonate (EC), methyl ethyl carbonate (EMC), and diethyl carbonate (DEC) are mixed in a volume ratio of 1:1:1 to obtain an organic solvent, then lithium salt LiPF is dissolved in the mixed organic solvent to prepare an electrolyte with a concentration of 1 mol / L.

[0149] (4) Preparation of the diaphragm: a polyethylene film is selected as the diaphragm.

[0150] (5) Preparation of the lithium ion battery: the above positive electrode sheet, diaphragm and negative electrode sheet are stacked in order, and are wound or laminated to obtain a bare battery cell; the bare battery cell is placed in an outer packaging shell, dried, and injected with electrolyte, with an injection coefficient of 2.8-4.5 g / Ah, and is packaged, placed, formed and constant-volume to obtain a lithium ion battery.

[0151] The positive active material can be selected from one or more of lithium-containing positive active materials including lithium iron phosphate, ternary material containing nickel, cobalt and manganese, lithium manganese iron phosphate, etc.; and the negative active material can be selected from one or more of negative active materials including artificial graphite, natural graphite, silicon-carbon, silicon-oxygen, lithium titanate, etc.

[0152] The positive active material is selected from one or more of lithium cobaltate (LCO), nickel-cobalt-manganese ternary material (NCM), nickel-cobalt-aluminum ternary material (NCA), lithium manganate (LiMn2O4), lithium iron phosphate (LFP), nickel lithium manganate (LNMO), and lithium manganese iron phosphate (LMFP). The nickel-cobalt-manganese ternary material (NCM) satisfies the general formula LiNixCoyMnzMaO2, wherein 0.1 1+ x Ni y M z Mn 2-x-y-z O 4-k , -0.1≤x≤0.2, 0.4≤y≤0.6, 0≤z≤0.2, 0≤k≤0.1, M is a doping element, and M includes but is not limited to one or more of Cr, Mo, Nb, Ru, P, S, Ta, W and Ti. The lithium manganese iron phosphate is a positive active material with an olivine structure and a hexagonal close-packed structure, and the chemical formula of the lithium manganese iron phosphate is: LiN b Fe x Mn y M 1-x-y P 1- m Q m O 4-n R n, wherein a is 0.9 to 1.1, b is 0 to 0.1, x is 0.001 to 0.999, y is 0.001 to 0.999, 1-x-y is 0 to 0.1, m is 0 to 0.1, n is 0 to 0.1, wherein M represents a doping element of the manganese site and / or the iron site of the lithium manganese iron phosphate, M includes but is not limited to one or more of Co, Mg, Zn, Ca, Ti, V, Ni, Cr; N represents a doping element of the lithium site of the lithium manganese iron phosphate, N includes but is not limited to one or more of Zn, Al, Na, K, Mg, Nb, Mo and W; Q represents a doping element of the phosphorus site of the lithium manganese iron phosphate, Q includes but is not limited to one or more of B, S, Si and N; R represents a doping element of the oxygen site of the lithium manganese iron phosphate, R includes but is not limited to one or more of S, F, Cl and Br.

[0153] Lithium iron phosphate (LFP for short) is a positive active material with an olivine-type crystal structure, and has the advantages of low cost and high safety. The chemical formula of lithium iron phosphate can be LiFe 1-x M x PO4; wherein 0≤x≤0.1, and the doping element M includes but is not limited to one or more of Mn, Ni, Co, Cr, Cu, Bi and Sb.

[0154] The negative active material is selected from one or more of a carbon material, a silicon-based material and lithium titanate (Li4Ti5O 12 ).

[0155] Specifically, the carbon material can be selected from one or more of natural graphite, artificial graphite, mesocarbon microbeads, hard carbon and soft carbon.

[0156] Specifically, the carbon material can be selected from one or more of natural graphite, artificial graphite, mesocarbon microbeads, hard carbon and soft carbon.

[0157] Specifically, the silicon-based material can be selected from one or more of elemental silicon, a silicon oxide compound, a silicon carbide compound and a silicon alloy.

[0158] The shell in the present application is a component for providing a containing space to accommodate the electrode assembly and other components therein and isolate them from the outside. The shell generally includes a body with an opening and a containing cavity at one end, and the opening of the shell can be closed by a cover plate to seal and isolate the internal environment of the battery monomer from the external environment. The material of the shell includes but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0159] The current output end in the application is arranged on one side of the positive / negative current collector and is integrally or separately formed with the current collector, and is electrically connected with the current collector to lead out the current on the corresponding current collector. The current output end can be a tab for leading out the cell, can be a adapter piece, or can include the tab and the adapter piece. The tab can be directly electrically connected with the pole, and the tab can also be electrically connected with the pole through the adapter piece. The current output end is made of a metal material with good electrical conductivity, such as copper, aluminum, copper-aluminum composite material, or nickel and the like.

[0160] The tab in the application is arranged on one side of the positive / negative current collector and is integrally or separately formed with the current collector, and is electrically connected with the current collector to lead out the current on the corresponding current collector. The current output end is made of a metal material with good electrical conductivity, such as copper, aluminum, copper or nickel and the like.

[0161] The adapter piece in the application is used to be electrically connected with the output end (tab) of the cell on one end, and is used to be electrically connected with the output end (pole) of the battery on the other end, so that the tab and the pole form a current conduction. The adapter piece is an aluminum adapter piece, a copper adapter piece, or an alloy (for example, steel) adapter piece, and can also be other conductive materials. The specific material of the adapter piece is selected according to the material of the pole and the tab of the battery. Generally, the material of the adapter piece needs to be the same as the material of the tab and the pole of the battery to ensure the welding quality.

[0162] The insulating piece in the application is arranged between the pole and the lower surface of the battery shell body, and is used to insulate the pole (electrode terminal) and the lower surface (or bottom surface) of the battery shell body from each other, and is used to insulate the cell and the cover plate from each other to reduce the risk of short circuit. The insulating piece can be plastic, rubber or other insulating materials. The plastic can be polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polyvinyl chloride (PVC) and the like. The rubber can be fluoro rubber, nitrile rubber or isobutyl rubber and the like.

[0163] The pole assembly in the application is used to electrically connect the electrode assembly located inside the shell and the external device (adjacent battery or other electrical equipment) located outside the shell. The battery can discharge the external device through the cell output end (tab) and the external device output end (pole assembly). The external power supply can charge the battery through the pole assembly and the tab. The pole assembly can be directly electrically connected with the tab of the cell, or can be electrically connected with the tab through a metal adapter piece. The pole assembly can be made of metal materials including but not limited to copper, aluminum, aluminum alloy, copper-aluminum alloy and the like.

[0164] The battery device in the present application can be used as an operating power source of an electric device, and can also be used as a driving power source of an electric device, instead of or partially instead of fuel or natural gas to provide driving power for vehicles. The electric device includes energy storage equipment, electric ships, aircraft, notebooks, electric tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace and many other technical fields.

[0165] The positive electrode sheet in the present application is one of the core components in the battery that carries the positive active material. When charging, metal ions (e.g. lithium ions) are released (oxidation reaction) from the lattice of the positive active material, migrate through the electrolyte and are embedded into the negative electrode. When discharging, metal ions (e.g. lithium ions in lithium batteries) are released from the negative electrode and embedded into the lattice of the positive active material (reduction reaction), realizing the storage and release of lithium ions. The positive electrode sheet generally includes a positive current collector and a positive active material layer, the positive active material layer is coated on at least one surface of the positive current collector, and the positive active material layer includes: positive active material, conductive agent and binder. Among them, the positive active material includes but is not limited to at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide and their respective modified compounds, or other conventional materials that can be used as battery positive active material. These positive active materials can be used alone or in combination with two or more. Among them, the lithium-containing phosphate includes but is not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP for short)), lithium iron phosphate and carbon composite material, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composite material, lithium manganese iron phosphate, lithium manganese iron phosphate and carbon composite material. Lithium transition metal oxide includes but is not limited to at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide and their modified compounds. The conductive agent includes but is not limited to one or a combination of two or more of graphite, superconducting carbon, carbon black (such as acetylene black, ketjen black, SuperP, etc.), carbon nanotubes, graphite nanomaterials and carbon nanofibers. The binder includes but is not limited to one or a combination of two or more of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, fluorine-containing acrylate resin, styrene butadiene rubber, polyacrylic acid, sodium polyacrylate, polyacrylamide, polyvinyl alcohol, sodium alginate, polymethacrylic acid, carboxymethyl chitosan, etc. The positive current collector is a conductive metal foil, which can be made of stainless steel, stainless steel, copper, aluminum, aluminum alloy, nickel, carbon electrode, carbon, nickel or titanium with silver plating treatment on the surface.

[0166] The negative electrode sheet in the present application is such that, during charging of the battery, active ions (e.g., Li) from the positive electrode are inserted into the negative electrode sheet, and at the same time, electrons from the positive electrode are transferred to the negative electrode sheet through an external circuit to maintain charge balance; during discharging, the active ions (e.g., Li) previously inserted into the negative electrode sheet can be removed, and at the same time, the electrons on the negative electrode sheet are transferred to the negative electrode through an external circuit to maintain charge balance, thereby achieving energy storage and release. The negative electrode sheet includes a negative electrode current collector and a negative electrode active layer disposed on at least one surface of the negative electrode current collector. The negative electrode current collector is an electrically conductive metal foil, which can be stainless steel, copper, aluminum, aluminum alloy, nickel, carbon electrode, carbon, nickel, or titanium, etc. that is treated with silver plating on the surface. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, copper, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). The negative electrode active layer includes a negative electrode active material, a conductive agent, a binder, etc. The negative electrode active material can be carbon-based materials such as graphite, porous carbon, hard carbon, soft carbon, mesocarbon microbeads, or silicon-based materials such as elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, etc. The conductive agent can be conductive carbon black, carbon nanotubes, etc. The binder can be butadiene styrene rubber, polyacrylic acid, etc.

[0167] The battery cell in the present application is a component in which an electrochemical reaction occurs, and is the smallest unit in which an electrochemical reaction such as charging / discharging can occur in a battery. The battery cell is a basic unit in a battery, and generally includes a positive electrode sheet, a negative electrode sheet, and a separator. A lithium ion battery cell mainly operates by lithium ions moving by deintercalation between the positive electrode sheet and the negative electrode sheet. In a cylindrical battery cell, a thin film structure of three layers is wound into an electrode assembly in a cylindrical shape, and in a rectangular battery cell, the thin film structure is wound or stacked into an electrode assembly in a substantially rectangular shape.

[0168] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0169] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims, along with full equivalents thereof.

[0170] In the description of the present application, it is to be understood that the numerical expressions relating to the components and steps of the embodiments set forth in the specification are to be understood in optional terms of a preferred embodiment and are not intended to limit the present application unless otherwise specifically indicated. It is also to be understood that the description of the present application is intended to be illustrative, and not restrictive, and that the present application is not limited to the specific illustrative embodiments presented herein. Although the present application has been described in considerable detail with reference to certain preferred embodiments thereof, other versions will become apparent to those skilled in the art that fall within the scope of the present application. Therefore, the scope of the present application is not to be limited to the specific embodiments described herein, but only to those embodiments specifically recited in the claims that follow, and their equivalents.

[0171] For the purposes of the present application, the term "about" means ± 10% of the value being described.

[0172] In addition, it should be understood that the application can be employed in a variety of applications beyond the example control system described herein without departing from the scope of the present application.

[0173] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A single-cell battery, characterized in that, The single battery includes a housing (10) and a cell (20) disposed in the housing (10). The end face of the housing (10) is provided with a first protrusion (11). The first protrusion (11) protrudes in a direction away from the cell (20). The side of the first protrusion (11) facing closer to the cell (20) has a receiving cavity (111). The cell (20) includes a body (21) and a current output terminal (22) electrically connected to the body (21). At least a portion of the current output terminal (22) is located in the receiving cavity (111). The current output terminal (22) is located at least one end of the cell (20) in a first direction. In the first direction, the height of the receiving cavity (111) is Hmm, and the dimension of the current output terminal (22) extending into the receiving cavity (111) is Bmm. The first protrusion (11) includes a protruding bottom wall (112) facing away from the battery cell (20) and an opening (113) near the battery cell (20). In a second direction perpendicular to the first direction, the size of the opening (113) is L1 mm, the size of the protruding bottom wall (112) is L2 mm, L1-L2=A, and 0.02≤A (HB) ≤ 9.

5.

2. The single-cell battery according to claim 1, characterized in that, In a third direction perpendicular to both the first and second directions, the distance between the edge of the first protrusion (11) and the edge of the housing (10) is Dmm, where 10mm≤Dmm≤100mm.

3. The single-cell battery according to claim 1, characterized in that, The sidewall of the first protrusion (11) has a first R-angle with the end face of the housing (10), the radius of the first R-angle being R1mm, 0.2mm≤R1mm≤5mm; and / or, The angle between the sidewall of the first protrusion (11) and the end face of the housing (10) is C1°, 50°≤C1°≤85°.

4. The single-cell battery according to claim 1, characterized in that, The raised bottom wall (112) and the side wall of the first raised portion (11) have a second R-angle, the radius of the second R-angle being R2mm, 0.2mm≤R2mm≤4.8mm; and / or, The angle between the raised bottom wall (112) and the side wall of the first raised part (11) is C2°, 95°≤C2°≤130°.

5. The single-cell battery according to claim 1, characterized in that, In the extending direction of the sidewall of the first protrusion (11), the length of the sidewall of the first protrusion (11) is N mm, 1.04≤N / H≤1.

5.

6. The single-cell battery according to claim 1, characterized in that, 0.2mm≤Amm≤5mm; and / or, 0.1mm≤(HB)mm≤1.9mm.

7. The single-cell battery according to claim 1, characterized in that, 21mm≤L1mm≤60mm; and / or, 16mm ≤ L2mm ≤ 59.8mm; and / or, 0.2mm≤Hmm≤2mm; and / or, 0.1mm≤Bmm≤0.9mm.

8. The single-cell battery according to claim 1, characterized in that, The connection point between the side wall of the first protrusion (11) and the end face of the housing (10) is the first connection point (60). The current output terminal (22) includes a tab (221). The tab (221) has a first bending point (61) in the receiving cavity (111). The minimum distance between the first connection point (60) and the first bending point (61) is K1mm, where 0.4mm≤K1mm≤10mm.

9. The single-cell battery according to claim 1, characterized in that, The connection point between the side wall of the first protrusion (11) and the end face of the housing (10) is the first connection point (60), and the connection point between the current output terminal (22) and the battery cell (20) is the second connection point (62). The minimum distance between the first connection point (60) and the second connection point (62) is K2mm, and 0.01mm≤K2mm≤8mm.

10. The single-cell battery according to claim 1, characterized in that, The connection point between the sidewall of the first protrusion (11) and the end face of the housing (10) is the first connection point (60). The current output terminal (22) includes a tab (221). In the second direction, the distance between the first connection point (60) and the tab (221) is K3mm, where 0.4mm≤K3mm≤1.5mm.

11. The single-cell battery according to claim 1, characterized in that, The current output terminal (22) includes a tab (221). In the second direction, the distance between the end of the tab (221) extending into the receiving cavity (111) and the side wall of the housing (10) is K4mm, where 0.4mm≤K4mm≤8mm.

12. The single-cell battery according to any one of claims 1 to 11, characterized in that, The current output terminal (22) includes a tab (221), and the single cell also includes an adapter plate (30) and a terminal (50). The terminal (50) is fixed to the housing (10). The tab (221) is electrically connected to the terminal (50) through the adapter plate (30). The tab (221) is led out from the cell (20) and bent to the side of the adapter plate (30) away from the cell (20) and welded to the adapter plate (30).

13. The single-cell battery according to claim 12, characterized in that, 0.5mm≤Amm≤5mm.

14. The single-cell battery according to claim 13, characterized in that, In the second direction, there is a first gap (65) between the tab (221) and the adapter (30), the size of the first gap (65) is F1mm, 0.1mm≤F1mm≤1.5mm.

15. The single-cell battery according to any one of claims 1 to 11, characterized in that, The current output terminal (22) includes a tab (221), and the single cell also includes an adapter (30). The tab (221) is located between the adapter (30) and the cell (20). The surface of the adapter (30) facing the cell (20) is connected to the tab (221). At least a portion of the adapter (30) is located within the receiving cavity (111), with a thickness of 0.1 mm ≤ (HB) ≤ 1.7 mm.

16. The single-cell battery according to claim 15, characterized in that, The tab (221) has an overlapping area formed by bending. The bending point of the tab (221) is the second bending point (63). The connection point between the tab (221) and the battery cell (20) is the second connection point (62). The distance between the second bending point (63) and the second connection point (62) is Umm, where 3mm≤Umm≤15mm.

17. The single-cell battery according to any one of claims 1 to 11, characterized in that, The current output terminal (22) includes a tab (221), which is connected to the electrode of the cell (20). The tab (221) has a staggered segment in a third direction that is perpendicular to both the first and second directions. The distance between the two staggered segments that are furthest apart is Gmm, where Gmm ≤ 2.5mm.

18. The single-cell battery according to any one of claims 1 to 11, characterized in that, The single battery cell includes at least two of the cells (20), and the current output terminals (22) of the at least two cells (20) are located in the receiving cavity (111).

19. The single-cell battery according to claim 18, characterized in that, The current output terminal (22) includes a tab (221), and the single cell also includes an adapter plate (30). The tabs (221) of at least two cells (20) are welded to the same adapter plate (30) and at least two first solder marks (64) are formed. The distance between two adjacent first solder marks (64) is Emm, where 8mm≤Emm≤64mm.

20. The single-cell battery according to any one of claims 1 to 11, characterized in that, In the first direction, the distance between the end of the outermost pole piece of the body (21) and the end face of the housing (10) where the first protrusion (11) is provided is Tmm, 4mm≤Tmm≤8.5mm.

21. The single-cell battery according to any one of claims 1 to 11, characterized in that, The single cell also includes an insulating component (40), which is located between the current output terminal (22) and the first protrusion (11). The insulating component (40) includes an insulating plate (42) and a second protrusion (41) disposed on the insulating plate (42). At least a portion of the second protrusion (41) is located within the receiving cavity (111). The thickness of the sidewall of the second protrusion (41) is N1 mm, where 0.4 mm ≤ N1 mm ≤ 1.2 mm; and / or, The thickness of the bottom wall of the second protrusion (41) is N2mm, 0.4mm≤N2mm≤1mm.

22. The single-cell battery according to claim 21, characterized in that, The elastic modulus of the insulating element (40) is EGPa, where EGPa ≤ 10GPa; and / or, The sidewall of the second protrusion (41) has a third R-angle between it and the insulating plate (42), and the radius of the third R-angle is R3mm, 0.5mm≤R3mm≤4mm.

23. The single-cell battery according to claim 21, characterized in that, There is a second gap (66) between the first protrusion (11) and the second protrusion (41), and the size of the second gap (66) is F2mm, 0.1mm≤F2mm≤1mm.

24. The single-cell battery according to any one of claims 1 to 11, characterized in that, The single battery cell also includes an electrode post (50), which is disposed on the raised bottom wall (112). The electrode post (50) is electrically connected to the current output terminal (22), and the cross-sectional area of ​​the electrode post (50) is S1mm. 2 The area of ​​the raised bottom wall (112) is S2mm. 2 , 0.01≤S1 / S2≤0.

5.

25. The single-cell battery according to claim 24, characterized in that, The connection between the pole (50) and the current output terminal (22) is a second solder mark (67). The current output terminal (22) includes a tab (221), and the single cell also includes an adapter (30). The tab (221) is bent to the side of the adapter (30) away from the cell (20) and welded to the adapter (30). The distance between the second solder mark (67) and the bending point of the tab (221) is Qmm, where 10mm≤Qmm≤35mm.

26. The single-cell battery according to any one of claims 1 to 11, characterized in that, The single battery also includes a terminal post (50), which and the first protrusion (11) are both disposed on the end face of the housing (10). The projections of the terminal post (50) and the first protrusion (11) on the end face do not overlap. The terminal post (50) is electrically connected to the current output terminal (22). The distance between the terminal post (50) and the first protrusion (11) is Y mm, where 5 mm ≤ Y mm ≤ 60 mm.

27. The single-cell battery according to any one of claims 1 to 11, characterized in that, The current output terminal (22) includes a tab (221). In the third direction, the width of the tab (221) is W1mm, and the width of the first protrusion (11) is W2mm, where 1mm≤W2-W1≤245mm.

28. A battery device, characterized in that, The battery device includes a single cell, which is the single cell according to any one of claims 1 to 27.

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