Battery cell and battery

Abstract

The present application provides a battery cell. The length of a positive electrode tab in a direction perpendicular to the direction of extension thereof is L1, and the length of a negative electrode tab in a direction perpendicular to the direction of extension thereof is L2, wherein L1 / L2=n, and the value range of n is 1.2≤n≤2, that is, the length of the positive electrode tab is greater than that of the negative electrode tab, so that the extended design of the positive electrode tab is achieved, electron conduction is accelerated, and a high-speed electron channel is constructed, thereby reducing the electron conduction resistance during charging, and further reducing the direct-current resistance of the battery cell.

Description

Cells and batteries

[0001] This application claims priority to Chinese Patent Application No. 202421243375.6, filed with the Chinese Patent Office on May 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a battery cell and a battery. Background Technology

[0003] As the primary power source for new energy vehicles, the charging speed of batteries directly impacts user experience. Traditional charging methods typically take several hours to fully charge, limiting user flexibility. Fast charging technology, by increasing charging power, can complete charging quickly, improving the user experience. However, in related technologies, the battery tabs are often too short when welded to other components, resulting in slower electron conduction speeds, higher DC resistance (DCR) of the cell, and reduced cycle life. Furthermore, the limited weldable area of ​​the tabs also prevents the cell from meeting the overcurrent requirements of fast charging. Technical issues

[0004] The purpose of this application is to provide a cell and battery that can accelerate the conduction speed of electrons, build a high-speed electron channel, thereby effectively reducing the electron conduction resistance during the charging process, and thus significantly reducing the DC resistance of the cell. Technical solutions

[0005] In a first aspect, this application provides a battery cell, including at least one cell pack, each cell pack including a positive electrode plate, a positive electrode tab, a negative electrode plate and a negative electrode tab, the positive electrode tab being disposed on the positive electrode plate and extending in a direction away from the positive electrode plate, the length of the positive electrode tab in the direction perpendicular to its own extension is L1; the negative electrode plate is disposed on the negative electrode plate and extends in a direction away from the negative electrode plate, the length of the negative electrode tab in the direction perpendicular to its own extension is L2;

[0006] Where L1 / L2=n, and the range of n is 1.2≤n≤2.

[0007] Secondly, this application provides a battery, including a battery cell, a protective film layer, and a casing provided in this application, wherein the protective film layer covers the outer surface of the battery cell, and the battery cell and the protective film layer are disposed inside the casing. Beneficial effects

[0008] The beneficial effects of the battery cell provided in this application are as follows: L1 / L2=n, where the value of n is in the range of 1.2≤n≤2. This means the length of the positive electrode tab is greater than the length of the negative electrode tab, achieving a larger positive electrode tab design. This accelerates electron conduction speed, constructs a high-speed electron channel, and effectively reduces the electron conduction resistance during charging, thereby significantly reducing the DC resistance of the battery cell to less than or equal to 0.42. Furthermore, increasing the length L1 of the positive electrode tab increases the solderable area, thereby improving the overcurrent capacity of the battery cell during fast charging, reducing the temperature rise of the battery cell during high-rate charging, and meeting the requirements of fast charging. Attached Figure Description

[0009] Figure 1 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0010] Figure 2 is an exploded view of a battery cell provided in some embodiments of this application;

[0011] Figure 3 is a schematic diagram of the connection between the core package and the terminal post in a battery cell provided in some embodiments of this application;

[0012] Figure 4 is a schematic diagram showing the dimensions of the core package and pole connection in Figure 3;

[0013] Figure 5 is a schematic diagram showing the dimensions of the positive electrode connector and positive electrode post in Figure 3;

[0014] Figure 6 is a schematic diagram showing the dimensions of the negative electrode connecting piece and the negative electrode post in Figure 3;

[0015] Figure 7 is a schematic diagram of the battery structure provided in some embodiments of this application;

[0016] Figure 8 is an exploded view of a battery provided in some embodiments of this application.

[0017] The following are the labeling elements in the figure:

[0018] Cell: 10; Cell Pack: 11; Positive Tab: 111; Negative Tab: 112; Positive Plate: 113; Negative Plate: 114; Positive Connector: 12; Negative Connector: 13; Positive Column: 14; Negative Column: 15; First Connecting Part: 121; Second Connecting Part: 122; First Intermediate Part: 123; Third Connecting Part: 131; Fourth Connecting Part: 132; Second Intermediate Part: 133; First Weld Mark: 20; Second Weld Mark: 21; Battery: 300; Casing: 31; Bottom Casing: 311; Top Cover Assembly: 312; Liquid Injection Hole: 3121; Sealing Granules: 34; Top Insulating Sheet: 35; Explosion-proof Valve: 36; Blue Film: 37; First Auxiliary Welding Sheet: 38; Second Auxiliary Welding Sheet: 39. Embodiments of the present invention

[0019] Please refer to Figures 1 and 2 together. As shown in Figure 1, the battery cell 10 of this embodiment includes at least one core package 11. Each core package 11 includes a positive electrode 113, a negative electrode 114, a separator (not shown), a positive tab 111, and a negative tab 112. The positive electrode 113 and the negative electrode 114 are stacked. A separator is provided between adjacent positive electrode 113 and negative electrode 114 to separate them. The positive tab 111 is disposed on the positive electrode 113. The negative tab 112 is connected and disposed on the negative electrode 114. As shown in Figure 2, the positive tab 111 is disposed on one side of the positive electrode 113 along the y-direction, and the negative tab 112 is disposed on one side of the negative electrode 114 along the y-direction. The positive tab 111 extends in a direction away from the positive electrode 113, and the negative tab 112 extends in a direction away from the negative electrode 114. In specific implementation, as shown in Figure 2, both the positive electrode tab 111 and the negative electrode tab 112 extend along the y direction.

[0020] In some possible implementations, a positive electrode tab 111 is disposed on one side of the positive electrode plate 113 along the y-direction. The positive electrode plate 113 is connected to the positive electrode tab 111 via a connecting portion. A negative electrode tab 112 is disposed on one side of the negative electrode plate 114 along the y-direction. The negative electrode plate 114 is connected to the negative electrode tab 112 via a connecting portion.

[0021] The length of the positive electrode 111 perpendicular to its extension direction is L1, and the length of the negative electrode 112 perpendicular to its extension direction is L2. That is, the lengths of the positive electrode 111 and the negative electrode 112 in the x-direction are L1 and L2, respectively, where L1 is greater than L2. Specifically, L1 / L2 = n, where the value of n is in the range of 1.2 ≤ n ≤ 2. For example, n can be 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2, etc.

[0022] It should be noted that the DC resistance of cell 10 includes ohmic polarization resistance (RI), boundary anti-polarization resistance (Rct), and concentration polarization resistance (Rc). Boundary anti-polarization resistance is mainly generated during the initial establishment of the interface potential, concentration polarization resistance is caused by the concentration difference between the inside and outside of the electrode, and ohmic polarization resistance is composed of electron conduction resistance and solution resistance. Reducing ohmic polarization resistance is an effective means to reduce the DC resistance of cell 10. This application designs the ratio of the length L1 of the positive electrode tab 111 to the length L2 of the negative electrode tab 112 to be n, where n ranges from 1.2 to n ≤ 2. This allows the length of the positive electrode tab 111 to be greater than the length of the negative electrode tab 112, thereby increasing the size of the positive electrode tab 111, accelerating electron conduction speed, constructing a high-speed electron channel, effectively reducing electron conduction resistance during charging, and thus significantly reducing the DC resistance of cell 10, making the DC resistance of cell 10 less than or equal to 0.42. In addition, increasing the length L1 of the positive tab 111 can increase the solderable area of ​​the positive tab 111, thereby improving the overcurrent capacity of the battery cell 10 during fast charging, reducing the temperature rise of the battery cell 10 during high-rate charging, and meeting the fast charging requirements.

[0023] Table 1

[0024] DC resistance values ​​(mΩ) for n1.3, 1.4, 1.5, 1.6, 1.7, and 1.8 are as follows: 0.420, 0.401, 0.373, 0.383, 0.389, and 0.392.

[0025] Please refer to Table 1, which shows the DC resistance of cell 10 when n is in the range of 1.2 ≤ n ≤ 2. As can be seen from Table 1, when n is in the range of 1.2 ≤ n ≤ 2, the DC resistance of cell 10 is relatively low. Especially when n is in the range of 1.5 < n ≤ 1.8, the DC resistance of cell 10 is less than 0.4 mΩ, demonstrating excellent electronic conductivity and a significantly lower DC resistance. Furthermore, the closer n is to 1.5, the more significantly the DC resistance of cell 10 decreases, and the more significantly its fast-charging capability improves.

[0026] Furthermore, in one embodiment, the length L1 ranges from 70 to 80 millimeters (mm), such as 70mm, 72mm, 73mm, 75mm, 78mm, or 80mm; the length L2 ranges from 40mm to 50mm, such as 40mm, 42mm, 43mm, 45mm, 48mm, or 50mm. The length L1 of the positive electrode tab 111 and the length L2 of the negative electrode tab 112 are limited by the total length of the core package 11.

[0027] Furthermore, the length L2 of the negative electrode tab 112 is 50mm. Increasing the length L2 of the negative electrode tab 112 can also increase the surface area of ​​the negative electrode tab 112, thereby reducing the DC resistance of the cell 10. That is, while keeping L1 / L2=1.5, setting the length L2 of the negative electrode tab 112 to 50mm can further reduce the DC resistance of the cell 10.

[0028] Please refer to Figure 2. In this embodiment, the angle a1 between the outer sides of the positive electrode tab 111 and the positive electrode plate 113 is an obtuse angle, and the angle a2 between the outer sides of the negative electrode tab 112 and the negative electrode plate 114 is also an obtuse angle. By setting the obtuse angle, the tabs can be prevented from folding during the manufacturing process.

[0029] Furthermore, the included angle α1 between the positive electrode tab 111 and the positive electrode plate 113 on the outer side ranges from 92° to 100°, such as 92°, 93°, 94°, 95°, 96°, 97°, 98°, or 100°. The included angle α2 between the negative electrode tab 112 and the negative electrode plate 114 on the outer side ranges from 92° to 100°, such as 92°, 93°, 94°, 95°, 96°, 97°, 98°, or 100°. In one embodiment, the included angles α1 and α2 can be the same, such as both being 97°. Of course, in other embodiments, the included angles α1 and α2 can be different, for example, α1 can be 97° and α2 can be 93°.

[0030] In one embodiment, the side of the positive electrode tab 111 furthest from the positive electrode plate 113 is rounded. Similarly, the side of the negative electrode tab 112 furthest from the negative electrode plate 114 is rounded. By providing rounded transition corners, the top of the tabs is smoothly transitioned, further reducing the possibility of the tabs folding during manufacturing. In some possible embodiments, the radius of the rounded corner is 8mm-12mm, such as 8mm, 9mm, 10mm, or 12mm.

[0031] As shown in Figure 2, in one embodiment, the width of the positive electrode 113 is L3, and the width of the negative electrode 114 is L4. In this embodiment, the width L3 of the positive electrode 113 is 30mm-40mm. In some possible embodiments, L3 is 30mm, 31mm, 32mm, 35mm, 37mm, 38mm, or 40mm, etc. The width L4 of the negative electrode 114 is 30mm-40mm. In some possible embodiments, L4 is 30mm, 31mm, 32mm, 35mm, 37mm, 38mm, or 40mm, etc. The widths of the positive electrode 113 and the negative electrode 114 are set within the range of 30mm-40mm. On the one hand, the appropriate widths of the positive electrode 113 and the negative electrode 114 ensure that the core pack 11 can provide sufficient power; on the other hand, the widths of the positive electrode 113 and the negative electrode 114 are not too large, so that the core pack 11 occupies too much volume.

[0032] It should be noted that the width L3 of the positive electrode 113 refers to the dimension of the positive electrode 113 in the direction perpendicular to the extension of the positive electrode tab 111, and the width L4 of the negative electrode 114 refers to the dimension of the negative electrode 114 in the direction perpendicular to the extension of the negative electrode tab 112. That is, the widths of the positive electrode 113 and the negative electrode 114 in the x-direction are L3 and L4, respectively.

[0033] In one embodiment, L3 < L4. In specific implementations, L3 is 1mm-3mm smaller than L4, for example, L3 is 1mm, 2mm, or 3mm smaller than L4. Since lithium is easily deposited on the positive electrode 113, affecting the smooth flow of lithium ions within the cell 10, it causes an increase in resistance. In this embodiment, by setting the width L3 of the positive electrode 113 to be smaller than the width L4 of the negative electrode 114, the possibility of lithium deposition on the positive electrode 113 is reduced, thereby reducing the internal resistance of the cell 10, reducing internal losses in the cell 10, avoiding capacity reduction in the cell 10, and improving the efficiency of the cell 10.

[0034] Correspondingly, the width L5 of the positive electrode tab 111 is 1mm-3mm larger than the width L6 of the negative electrode tab 112, for example, L5 is 1mm, 2mm, or 3mm larger than L6, to compensate for the width difference between the positive electrode plate 113 and the negative electrode plate 114, so that the positive electrode tab 111 and the negative electrode tab 112 can be connected to the electrode post respectively. The width L5 of the positive electrode tab 111 refers to the dimension of the positive electrode tab 111 perpendicular to its extension direction, and the width L6 of the negative electrode tab 112 refers to the dimension of the negative electrode tab 112 perpendicular to its extension direction. That is, the widths of the positive electrode tab 111 and the negative electrode tab 112 in the x-direction are L5 and L6 respectively. The width L5 of the positive electrode tab 111 is 18mm-22mm, and the width L6 of the negative electrode tab 112 is 18mm-22mm. In some possible implementations, L3 is 30mm, L4 is 31mm, L5 is 38mm, and L6 is 37mm, or L3 is 37mm, L4 is 40mm, L5 is 22mm, and L6 is 19mm, etc.

[0035] It should be noted that during the manufacturing process of the battery cell 10, the positive tab 111 is set on the positive electrode plate 113 and the negative tab 112 is set on the positive electrode plate 113. Then, solder marks are set on the positive tab 111 and the negative tab 112. Then, the positive tab 111 and the negative tab 112 are cut so that the width L5 of the positive tab 111 is 18mm-22mm and the width L6 of the negative tab 112 is 18mm-22mm. After that, the positive tab 111 is connected to the positive electrode connecting piece and the positive electrode post, and the negative tab 112 is connected to the negative electrode connecting piece and the negative electrode post. During the connection of positive electrode tab 111 to positive electrode connecting piece and positive electrode post, and the connection of negative electrode tab 112 to negative electrode connecting piece and negative electrode post, a 1mm-2mm gap is left between positive electrode tab 111 and positive electrode post to facilitate laser welding of positive electrode connecting piece and positive electrode tab 111, and a 1mm-2mm gap is left between negative electrode tab 112 and negative electrode post to facilitate laser welding of negative electrode connecting piece and negative electrode tab 112.

[0036] Referring to Figures 3 and 4, the battery cell 10 also includes a positive electrode connecting piece 12, a negative electrode connecting piece 13, a positive electrode post 14, and a negative electrode post. The positive electrode connecting piece 12 is welded to the positive electrode tab 111, allowing the positive electrode tab 111 to connect to the positive electrode post 14 via the positive electrode connecting piece 12. The negative electrode connecting piece 13 is welded to the negative electrode tab 112, allowing the negative electrode tab 112 to connect to the negative electrode post via the negative electrode connecting piece 13. As shown in Figure 3, both the positive electrode post 14 and the negative electrode post are disposed on the battery cell body formed by connecting two core packages 11, and are spaced apart. The diameter of the positive electrode post 14 is d1, and the diameter of the negative electrode post is d2. In some possible embodiments, the diameters d1 and d2 of both the positive electrode post 14 and the negative electrode post are between 10mm and 14mm, for example, 10mm, 12mm, or 14mm. In this embodiment, both the diameters d1 and d2 of the positive electrode post 14 and the negative electrode post are 12mm. The diameters of the positive and negative terminals are designed to facilitate electrical connection between the battery and external electrical devices. Furthermore, the diameters of the positive and negative terminals, set between 10mm and 14mm, do not take up too much space.

[0037] As shown in Figure 3, each core package 11 has a first solder mark 20 on its positive electrode tab 111 and a second solder mark 21 on its negative electrode tab 112. There can be multiple first solder marks 20, and only one second solder mark 21 on the negative electrode tab 112. In some possible embodiments, multiple first solder marks 20 are arranged along an extension direction x perpendicular to the positive electrode tab 111. Each first solder mark 20 has the same size, and the size of each first solder mark 20 on the positive electrode tab 111 and the size of each second solder mark 21 on the negative electrode tab 112 are the same, including the length and width of the solder mark. Furthermore, the width of each first solder mark 20 on the positive electrode tab 111 and the length of each second solder mark 21 on the negative electrode tab 112 ranges from 6mm to 10mm, and their respective lengths range from 15mm to 20mm, to facilitate welding of the positive electrode tab 111 and the negative electrode tab 112 to the positive electrode connecting piece 12 and the negative electrode connecting piece 13, respectively. The width can be, for example, 6.5mm, 8mm or other values, and the length can be, for example, 16mm, 18mm or other values.

[0038] In one embodiment, each core package 11 has two first solder marks 20 on the positive tab 111 and one second solder mark 21 on the negative tab 112. The total area of ​​the first solder marks 20 on the positive tab 111 is larger than the total area of ​​the second solder marks 21 on the negative tab 112, thereby making the welding area between the positive connecting piece 12 and the positive tab 111 larger than the welding area between the negative connecting piece 13 and the negative tab 112. It can be understood that when there are multiple core packages 11, the welding area between the positive connecting piece 12 and the positive tab 111 refers to the welding area between the positive connecting piece 12 and the positive tab 111 of each core package 11. In this embodiment, the welding area between the positive connecting piece 12 and the positive tab 111 is set to be larger, thereby improving the overcurrent capacity of the cell 10, reducing the DC resistance of the cell 10, and reducing the temperature rise during high-rate charging.

[0039] In one embodiment, in the direction perpendicular to the extension of the positive electrode tab 111, the distance L7 between the side of the positive electrode tab 111 away from the negative electrode tab 112 and the edge of the positive electrode plate 113 is 10mm-20mm. As shown in Figure 4, in the x-direction, the distance L7 between the side of the positive electrode tab 111 away from the negative electrode tab 112 and the edge of the positive electrode plate 113 is 10mm-20mm. Due to the widened design of the positive electrode tab 111, the distance L7 between the side of the positive electrode tab 111 away from the negative electrode tab 112 and the edge of the positive electrode plate 113 is shortened. In some possible embodiments, L7 is 10mm, 11mm, 12mm, 13mm, 15mm, 16mm, 18mm, or 20mm, etc. In the x-direction, the distance L8 between the center of the positive electrode post 14 and the edge of the positive electrode plate 113 is 38mm-58mm. In some possible implementations, L8 is 38mm, 40mm, 42mm, 45mm, 48mm, 50mm, 52mm, 56mm or 58mm, etc.

[0040] Wherein, L8-L7-d1 / 2 ≥ 5mm. As shown in Figure 4, the included angle α1 between the outer sides of the positive electrode tab 111 and the positive electrode plate 113 is slightly greater than 90°, causing the two long sides of the positive electrode tab 111 perpendicular to its own extension direction to have different lengths. The difference between the longer and shorter long sides is in the range of 0~7mm. By setting L8-L7-d1 / 2 ≥ 5mm, most of the positive electrode post 14 and the positive electrode tab 111 overlap in the y-direction, and even the shorter long side of the positive electrode post 14 overlaps with the shorter long side of the positive electrode tab 111 in the y-direction. Since the shorter long side of the positive electrode post 14 and the positive electrode tab 111 is connected by the positive electrode connecting piece 12, L8-L7-d1 / 2 ≥ 5mm can make the distance between the positive electrode tab 111 and the positive electrode post 14 closer, further improving the overcurrent efficiency between the positive electrode tab 111 and the positive electrode post 14 and reducing the DC resistance of the cell 10. Furthermore, L8-L7-d1 / 2≥7mm, which makes the shorter long side of the positive electrode post 14 and the positive electrode tab 111 completely overlap in the y direction, further shortening the distance between the positive electrode tab 111 and the positive electrode post 14.

[0041] During soldering, due to process limitations, the minimum distance between the solder mark and the edge of the tab is approximately 5mm, and there will also be a certain distance between two solder marks on the same tab. Since the first solder mark 20 is located on the positive tab 111 near the shorter long side, and further, L8-L7-d1 / 2≥12mm, the positive terminal post 14 and the first solder mark 20 on the positive terminal post 111 overlap in the y-direction, further improving the current flow efficiency between the positive terminal post 111 and the positive terminal post 14.

[0042] In other embodiments, the included angle α1 between the outer sides of the positive tab 111 and the positive electrode plate 113 is 90°. L8-L7-d1 / 2≥5mm allows the positive electrode post 14 and the first solder mark 20 on the positive tab 111 to overlap in the y direction, thereby improving the current flow efficiency between the positive tab 111 and the positive electrode post 14.

[0043] In some possible implementations, L8-L7+d1 / 2≤L1 / 2. As shown in Figure 4, the central axis of the positive electrode tab 111 is T. L8-L7+d1 / 2≤L1 / 2 ensures that the positive electrode post 14 is located to the left of the central axis T, that is, on the side away from the negative electrode post. This ensures the connection between the positive electrode post 14 and the positive electrode tab 111 while avoiding the positive electrode post 14 and the negative electrode post being too close.

[0044] On the positive electrode tab 111, the spacing L9 between the two first solder marks 20 is 5mm-10mm. For example, 5mm, 6mm, 8mm, or 10mm. As shown in Figures 3 and 4, the smaller the spacing L9 between the two first solder marks 20 on the positive electrode tab 111, the lower the DC resistance of the cell 10. The smaller the spacing L9 between the two first solder marks 20 on the positive electrode tab 111, the closer the two first solder marks 20 are to the positive electrode post 14, which is more conducive to the conduction of lithium ions and electrons between the tab, the connecting piece, and the post, further reducing the DC resistance of the cell 10.

[0045] When L8-L7+d1 / 2≤L1 / 2, the first solder mark 20 away from the negative electrode tab 112 (i.e., the first solder mark 20 on the left in Figure 4) is set to correspond with the positive electrode post 14. The smaller L9 is, the closer the first solder mark 20 near the negative electrode tab 112 (i.e., the first solder mark 20 on the right in Figure 4) is to the positive electrode post 14.

[0046] In this embodiment, in the x-direction, the distance L7 between the side of the positive electrode tab 111 away from the negative electrode tab 112 and the edge of the positive electrode plate 113 is 10 mm, and the distance L8 between the center of the positive electrode post 14 and the edge of the positive electrode plate 113 is 40 mm. L8-L7-d1 / 2 is 18 mm. The spacing L9 between the two first solder marks 20 is 5 mm.

[0047] The distance L10 between the positive electrode tab 111 and the negative electrode tab 112 is 22mm-35mm to avoid them being too close. In some possible embodiments, L10 is 22mm, 25mm, 26mm, 28mm, 30mm, 31mm, 32mm, 33mm, or 35mm, etc. In the x-direction, the distance L11 between the side of the negative electrode tab 112 away from the positive electrode tab 111 and the edge of the negative electrode plate 114 is 30mm-40mm. In some possible embodiments, L11 is 30mm, 32mm, 35mm, 38mm, 39mm, or 40mm, etc. The distance L12 between the center of the negative electrode post and the edge of the negative electrode plate 114 is 25mm-35mm. In some possible embodiments, L12 is 25mm, 28mm, 29mm, 30mm, 32mm, 33mm, or 35mm, etc.

[0048] In this embodiment, the distance L10 between the positive electrode tab 111 and the negative electrode tab 112 is 26 mm. The distance L11 between the side of the negative electrode tab 112 away from the positive electrode tab 111 and the edge of the negative electrode plate 114 is 38 mm. The distance L12 between the center of the negative electrode post and the edge of the negative electrode plate 114 is 35 mm.

[0049] As shown in Figure 4, the distance L13 between the center of the positive terminal 14 and the center of the negative terminal is 125-130 mm. In some possible embodiments, L13 is 125 mm, 126 mm, 128 mm, 129 mm, or 130 mm, etc. It is understood that the positive terminal 14 and the negative terminal are spaced apart to facilitate the placement of the connecting piece and to prevent short circuits caused by the positive terminal 14 and the negative terminal being too close. In this embodiment, L13 is 129 mm.

[0050] The distance L14 between the positive electrode connector 12 and the negative electrode connector 13 is 35mm-40mm. In some possible implementations, L14 is 35mm, 37mm, 39mm, or 40mm, etc. In this embodiment, L14 is 37mm. It is understood that a certain gap is provided between the positive electrode connector 12 and the negative electrode connector 13 to avoid short circuits. In this embodiment, the projection of the positive electrode connector 12 onto the positive electrode tab 111 protrudes beyond the edge of the positive electrode tab 111. In the projection pattern of the plane containing the negative electrode tab 112, the edge of the negative electrode tab 112 near the positive electrode tab 111 protrudes beyond the edge of the negative electrode connector 13 near the positive electrode connector 12. While ensuring that the positive electrode connector 12 covers the first solder mark 20 of the positive electrode tab 111 and the negative electrode connector 13 covers the second solder mark 21 of the negative electrode tab 112, the distance L14 between the positive electrode connector 12 and the negative electrode connector 13 is maintained between 35mm and 40mm.

[0051] As shown in Figure 4, in the x-direction, the distance between the side of the positive electrode connector 12 away from the negative electrode connector 13 and the edge of the positive electrode plate 113 is L15. Where L7 ≥ L15. It can be understood that in the x-direction, the length of the positive electrode connector 12 is greater than the length of the positive electrode tab 111, which facilitates the overlap and coverage of the positive electrode connector 12 with the first solder mark 20 on the positive electrode tab 111 in the x-direction. Furthermore, in the x-direction, the distance between the edge of the positive electrode connector 12 and the positive electrode plate 113 is less than the distance between the edge of the positive electrode tab 111 and the positive electrode plate 113. By ensuring complete coverage of the positive electrode connector 12 and the positive electrode tab 111 in the x-direction, the coverage of the positive electrode connector 12 with the first solder mark 20 is guaranteed, reducing the possibility of the first solder mark 20 being exposed and the electrical connection area being reduced.

[0052] In this embodiment, the number of core packages 11 is two. In other embodiments, the number of core packages 11 may be four or other.

[0053] As shown in Figure 3, the positive electrode connecting piece 12 includes a first connecting portion 121, a second connecting portion 122, and a first intermediate portion 123 connecting the first connecting portion 121 and the second connecting portion 122; the negative electrode connecting piece 13 includes a third connecting portion 131, a fourth connecting portion 132, and a second intermediate portion 133 connecting the third connecting portion 131 and the fourth connecting portion 132. The first connecting portion 121 and the second connecting portion 122 of the positive electrode connecting piece 12 are respectively welded to the positive electrode tabs 111 of the two core packages 11, and the third connecting portion 131 and the fourth connecting portion 132 of the negative electrode connecting piece 13 are respectively welded to the negative electrode tabs 112 of the two core packages 11.

[0054] In other embodiments, the positive electrode connecting piece 12 and the negative electrode connecting piece 13 can also be other shapes such as straight strips, which can be set according to actual needs.

[0055] Please refer to Figures 5 and 6 together. The length of the positive electrode connector 12 is D1, and the length of the negative electrode connector 13 is D5. Wherein, D1 / D5 = k, and the value of k ranges from 1.3 to n to 1.5. In some possible implementations, k is 1.3, 1.35, 1.36, 1.4, or 1.5. In this embodiment, the length L1 of the positive electrode tab 111 is greater than the length L2 of the negative electrode tab 112. Correspondingly, the length of the positive electrode connector 12 is greater than the length of the negative electrode connector 13. D1 / D5 = k, and the value of k ranges from 1.3 to n to 1.5, such that the positive electrode connector 12 covers the multiple first solder marks 20 on the positive electrode tab 111, and the negative electrode connector 13 covers the second solder marks 21 on the negative electrode tab 112 while ensuring the connection between the negative electrode connector 13 and the negative electrode post.

[0056] Specifically, as shown in Figure 5, the length D1 of the positive electrode connecting piece 12 is 75mm-78mm, such as 75mm, 76mm, 76.7mm, 77mm, or 78mm. The lengths of the first connecting portion 121 and the second connecting portion 122 are the same as the length D1 of the positive electrode connecting piece 12. The width D2 of the positive electrode connecting piece 12 is 33mm-36mm, such as 33mm, 35mm, or 36mm. The widths of the first connecting portion 121 and the second connecting portion 122 are respectively between 11mm and 12mm.

[0057] Understandably, if the length of the first connecting portion 121 and the second connecting portion 122 is too short, or if the width of the first connecting portion 121 and the second connecting portion 122 is too short, it is easy to insufficiently cover the first solder mark 20 on the positive electrode tab 111. If the length of the first connecting portion 121 and the second connecting portion 122 is too long, it is easy for the positive electrode connecting piece 12 to extend beyond the edge of the positive electrode piece 113, or to shorten the distance between the positive electrode connecting piece 12 and the negative electrode connecting piece 13, resulting in a short circuit.

[0058] The first connecting portion 121 and the second connecting portion 122 are located on both sides of the first intermediate portion 123 along the x-direction. The first intermediate portion 123 connects the first connecting portion 121 and the second connecting portion 122. Specifically, the first intermediate portion 123 is connected to the middle section of the first connecting portion 121 and the middle section of the second connecting portion 122. The first intermediate portion 123, the first connecting portion 121 and the second connecting portion 122 form an "H" shape. Understandably, the first intermediate portion 123, the first connecting portion 121, and the second connecting portion 122 form an "H" shape. The first connecting portion 121 is preferably connected to the first solder mark 20 on the positive electrode tab 111 of one core package 11, and the second connecting portion 122 is preferably connected to the positive electrode tab 111 of another core package 11. At the same time, the first intermediate portion 123 covers the positive electrode post 14, and the first intermediate portion 123 guides lithium ions and electrons from the middle section of the first connecting portion 121 and the second connecting portion 122 to the positive electrode post 14, and electrically connects with the positive electrode post 14.

[0059] In the direction in which the first connecting portion 121, the first intermediate portion 123, and the second connecting portion 122 are connected sequentially, the length of the first intermediate portion 123 first decreases and then increases, causing the side of the first intermediate portion 123 to form an arc-shaped curve. It can be understood that the smooth connection of the first connecting portion 121, the first intermediate portion 123, and the second connecting portion 122 can alleviate the resistance change of the positive electrode connecting piece 12 caused by the abrupt change in the length of the first connecting portion 121, the first intermediate portion 123, and the second connecting portion 122, thereby reducing the connection resistance of the positive electrode connecting piece 12.

[0060] As shown in Figure 5, the positive electrode connector 12 is symmetrical about the center line C1, which is the center line along the width of the positive electrode connector 12. The center line C1 extends along the length of the positive electrode connector 12, and the first connecting part 121 and the second connecting part 122 are located on both sides of the center line C1, respectively. The center of the positive electrode post 14 is on the center line C1 of the positive electrode connector 12, and the distance D3 between the center of the positive electrode post 14 and the second side edge of the second connecting part 122 is 27mm-30mm, such as 27mm, 28mm, or 30mm. It should be noted that the distance D3 between the center of the positive electrode post 14 and the second side edge S22 of the second connecting part 122 is equal to the distance between the center of the positive electrode post 14 and the second side edge of the first connecting part 121. It can be understood that the positive electrode connector 12 is mainly connected to the positive electrode post 14 through the first intermediate part 123. The center of the positive electrode post 14 overlaps with the center line C1 of the positive electrode connector 12, so that the first intermediate part 123 covers the positive electrode post 14 to achieve connection. Along the extension direction of the second connecting portion 122, i.e., in the x-direction, the distance D4 between the edge of the first intermediate portion 123 near the negative electrode connecting piece 13 and the edge of the second connecting portion 122 near the negative electrode connecting piece 13 is 30-33 mm, such as 30 mm, 31 mm, 32 mm, or 33 mm. It should be noted that the distance between the edge of the first intermediate portion 123 near the negative electrode connecting piece 13 and the edge of the second connecting portion 122 near the negative electrode connecting piece 13 is equal to the distance between the edge of the first intermediate portion 123 near the negative electrode connecting piece 13 and the edge of the first connecting portion 121 near the negative electrode connecting piece 13. It can be understood that lithium ions and electrons are transferred from the positive electrode tab 111 through the first connecting portion 121 or the second connecting portion 122, and then guided by the first intermediate portion 123, to the positive electrode post 14. Since the length of the first intermediate portion 123 is relatively small, the distance D4 between the edge of the first intermediate portion 123 near the negative electrode connecting piece 13 and the edge of the second connecting portion 122 near the negative electrode connecting piece 13 is set so that lithium ions and electrons are guided and concentrated from the second connecting portion 122 or the first connecting portion 121 to the first intermediate portion 123, that is, concentrated around the positive electrode post 14, and then transferred to the positive electrode post 14.

[0061] In this embodiment, D1 is 76.7 mm, D2 is 33 mm, D3 is 27 mm, and D4 is 33 mm. The width of both the first connecting portion 121 and the second connecting portion 122 is 11 mm. In the y-direction, the ratio of the width of the first connecting portion 121, the width of the second connecting portion 122, and the distance between the first connecting portion 121 and the second connecting portion 122 is 1:1:1. That is, the width of the first connecting portion 121, the width of the second connecting portion 122, and the distance between the first connecting portion 121 and the second connecting portion 122 are all 11 mm. This allows the first connecting portion 121 and the second connecting portion 122 to respectively cover the width of the corresponding first solder mark 20, and also avoids obstructing the positive electrode post 14.

[0062] Referring to Figure 6, both the third connecting portion 131 and the fourth connecting portion 132 are disposed at one end of the second intermediate portion 133 near the positive electrode connecting piece 12, that is, both the third connecting portion 131 and the fourth connecting portion 132 are disposed on the same side of the second intermediate portion 133 along the x-direction. Furthermore, the second intermediate portion 133 connects the third connecting portion 131 and the fourth connecting portion 132, and covers the negative electrode post. Since both the third connecting portion 131 and the fourth connecting portion 132 are disposed at one end of the second intermediate portion 133 near the positive electrode connecting piece 12, the third connecting portion 131 and the fourth connecting portion 132 respectively connect to the negative electrode tabs 112 of the two core packages 11, while the second intermediate portion 133 can cover the negative electrode post that maintains a safe distance from the positive electrode post 14.

[0063] The length D5 of the negative electrode connecting piece 13 is 52mm-55mm, such as 52mm, 53mm, 54mm, or 55mm. The lengths of the third connecting part 131 and the fourth connecting part 132 are the same as the length D5 of the negative electrode connecting piece 13. The width D6 of the negative electrode connecting piece 13 is 33mm-36mm, such as 33mm, 35mm, or 36mm. The widths of the third connecting part 131 and the fourth connecting part 132 are each between 11mm and 12mm.

[0064] As shown in Figure 6, the negative electrode connecting piece 13 is symmetrical about the center line C2, which is the center line C2 along the width direction of the negative electrode connecting piece 13. The center line C2 extends along the length direction of the negative electrode connecting piece 13, and the third connecting part 131 and the fourth connecting part 132 are located on both sides of the center line C2, respectively. The center of the negative electrode post 15 is on the center line C2 of the negative electrode connecting piece 13. It can be understood that the negative electrode connecting piece 13 is mainly connected to the negative electrode post 15 through the second intermediate part 133. The center of the negative electrode post 15 overlaps with the center line C1 of the negative electrode connecting piece 13, so that the intermediate part 133 covers the negative electrode post 15 to achieve connection. The distance D7 between the first side edge S31 of the second intermediate part 133 and the first side edge S41 of the fourth connecting part 132 is 27mm-30mm, such as 27mm, 28mm, 29mm or 30mm, etc. Understandably, lithium ions and electrons travel from the negative electrode tab 112 through the third connection portion 131 or the fourth connection portion 132, and are then guided by the second intermediate portion 133 to the negative electrode post 15. Because the second intermediate portion 133 is relatively short, the distance between the first side edge S31 of the second intermediate portion 133 and the first side edge S41 of the fourth connection portion 132 is set to D7. This guides and concentrates lithium ions and electrons from the fourth connection portion 132 or the third connection portion 131 to the second intermediate portion 133, i.e., concentrates them around the negative electrode post 15, and then transfers them to the negative electrode post 15.

[0065] The width D8 of the second intermediate portion 133 is 25mm-28mm, such as 25mm, 26mm or 28mm. Setting the width D8 of the second intermediate portion 133 to 25mm-28mm can meet the connection between the second intermediate portion 133 and the third connecting portion 131 and the fourth connecting portion 132. At the same time, the size of the second intermediate portion 133 is appropriate, reducing the space occupied by the negative electrode connecting piece 13.

[0066] In this embodiment, D5 is 52mm, D6 is 33mm, D7 is 27mm, D8 is 25mm, and k is 1.48.

[0067] In some possible implementations, the core pack 11 is a stacked core pack of a square battery, or it can be a wound core pack of a square battery. In the embodiments of this application, the core pack 11 is a stacked core pack. More specifically, the negative electrode 114, the separator, and the positive electrode 113 are stacked sequentially from bottom to top in the core pack 11 to form a stacked core pack.

[0068] Referring to Figures 7 and 8, this application embodiment also provides a battery 300, including a housing 31 and a battery cell 10 housed within the housing 31, wherein the battery cell 10 is the battery cell described in this application embodiment.

[0069] Furthermore, the outer casing 31 includes a bottom casing 311 and a top cover assembly 312. The bottom casing 311 has an opening, and the battery cell 10 is located inside the bottom casing 311. The bottom casing 311 can be, for example, an aluminum casing. The battery cell 10 is housed inside the bottom casing 311, and the top cover assembly 312 is fixed to the bottom casing 311 and covers the opening of the bottom casing 311. The top cover assembly 312 is provided with mounting holes for the positive terminal 14 and the negative terminal 15. The positive terminal tab 111 of the battery cell 10 is connected to the positive terminal 14 through a positive terminal connecting piece 12, and the negative terminal tab 112 of the battery cell 10 is connected to the negative terminal 15 through a negative terminal connecting piece 13.

[0070] Furthermore, the battery 300 also includes a sealing sheet and sealing particles 34. The top cover assembly 312 has an injection hole 3121, and the sealing particles 34 are inserted into the injection hole 3121 to enhance the battery's sealing effect. The sealing sheet, which can be, for example, an aluminum sheet, seals the injection hole 3121 by welding.

[0071] Furthermore, isolation brackets can be provided between the positive electrode connecting piece 12 and the core package 11, and between the negative electrode connecting piece 13 and the core package 11, respectively. The isolation brackets can prevent the core package 11 from contacting the positive electrode connecting piece 12 and the negative electrode connecting piece 13.

[0072] Furthermore, the battery 300 also includes a top insulating sheet 35, and an explosion-proof valve 36 is provided on the top cover assembly 312. The top insulating sheet 35 covers the side of the top cover assembly 312 facing away from the cell 10, and the top insulating sheet 35 has an opening corresponding to the position of the explosion-proof valve 36 to expose the explosion-proof valve 36. The insulation effect of the top insulating sheet 35 helps to prevent the cell 10 from short-circuiting.

[0073] In some possible implementations, a bottom support plate is provided between the bottom of the battery cell 10 and the bottom shell 311. The bottom support plate can prevent the battery cell 10 from contacting the bottom shell 311 and causing a short circuit. In addition, the outer surface of the battery cell 10 is covered with a protective film layer to prevent the 112 from directly contacting the bottom shell 311 and causing a short circuit.

[0074] The outer surface of the bottom shell 311 is covered with a blue film 37 to prevent the battery from short-circuiting.

[0075] In some possible implementations, the positive tab 111 and the negative tab 112 of the battery cell 10 are located on the same side of the battery cell 10. In other implementations, the positive tab 111 and the negative tab 112 may also be located on different sides of the battery cell 10.

[0076] In some possible implementations, auxiliary solder pads are provided on both the positive electrode connecting piece 12 and the negative electrode connecting piece 13. For example, a first auxiliary solder pad 38 is provided on the positive electrode connecting piece 12 and a second auxiliary solder pad 39 is provided on the negative electrode connecting piece 13, thereby protecting the electrode tab from being cracked by soldering.

[0077] This application also provides a method for manufacturing the battery 300, which specifically includes the following steps:

[0078] Step S1, positive and negative electrode homogenization: the positive electrode active material and the negative electrode active material are uniformly dispersed in the solvent with the conductive agent and the binder at a certain mass ratio to obtain the positive electrode slurry and the negative electrode slurry.

[0079] Step S2, positive and negative electrode coating: The uniformly dispersed positive electrode slurry and negative electrode slurry are stably coated onto the positive electrode current collector and the negative electrode current collector, respectively.

[0080] Step S3, positive and negative electrode sheet making: the coated positive and negative current collectors are rolled to the specified thickness and then cut to the specified size to obtain the positive and negative electrode sheets;

[0081] Step S4, stacking and assembling: stacking the prepared positive and negative electrode sheets into a core package, wherein the positive and negative electrode sheets are separated by a diaphragm, and assembling it with the outer shell;

[0082] Step S5, baking: The assembled battery is baked in a vacuum oven to the specified moisture content.

[0083] Step S6, electrolyte injection: inject the electrolyte into the battery through the injection hole on the top cover assembly, and let it stand until the electrolyte completely wets the electrode sheets.

[0084] Step S7, formation, activate the battery by drawing a negative pressure to remove the gas generated by the side reaction in the battery;

[0085] Step S8, capacity testing: The formed battery is sealed and welded, and then capacity testing is performed according to a pre-set process.

[0086] The above is a description of the battery cell and battery provided in the embodiments of this application.

[0087] The battery cell provided in this application includes at least one cell pack, each cell pack including a positive electrode plate, a positive electrode tab, a negative electrode plate, and a negative electrode tab, with the positive electrode tab disposed on the positive electrode plate. The positive electrode tab extends in a direction away from the positive electrode plate, and its length in the direction perpendicular to its extension is L1. The negative electrode plate has a negative electrode tab extending in a direction away from the negative electrode plate, and its length in the direction perpendicular to its extension is L2. Wherein, L1 / L2=n, and the value of n is in the range of 1.2≤n≤2, meaning the length of the positive electrode tab is greater than the length of the negative electrode tab, achieving a larger positive electrode tab design, accelerating electron conduction speed, constructing a high-speed electron channel, thereby effectively reducing the electron conduction resistance during charging, and thus significantly reducing the DC resistance of the battery cell, making the DC resistance of the battery cell less than or equal to 0.42. Furthermore, increasing the length L1 of the positive electrode tab can increase the solderable area of ​​the positive electrode tab, thereby improving the overcurrent capacity of the cell during fast charging and reducing the temperature rise of the cell during high-rate charging, thus meeting the requirements of fast charging. This application also provides a battery including the above-mentioned cell, which has the above-mentioned beneficial effects.

Claims

1. An electric core comprising at least one core package, each of the core packages (11) comprising a positive electrode tab (113), a positive electrode lug (111), a negative electrode tab (114) and a negative electrode lug (112), the positive electrode lug (111) being arranged on the positive electrode tab (113) and extending away from the positive electrode tab (113), the length of the positive electrode lug (111) in a direction perpendicular to the extending direction of the positive electrode lug (111) being L1; the negative electrode lug (112) being arranged on the negative electrode tab (114) and extending away from the negative electrode tab (114), the length of the negative electrode lug (112) in a direction perpendicular to the extending direction of the negative electrode lug (112) being L2; L1 / L2 = n, and n is in a range of 1.2≤n≤2. wherein n is in a range of 1.6≤n≤1.

8.

2. The electric cell of claim 1, wherein, 3. The electric core according to claim 1, further comprising a positive electrode post (14), the positive electrode post (14) being arranged on the core package (11) and electrically connected with the positive electrode lug (111), the diameter of the positive electrode post (14) being d1. In a direction perpendicular to the extending direction of the positive electrode lug (111), the distance between the side of the positive electrode lug (111) away from the negative electrode lug (112) and the edge of the positive electrode tab (113) is L7, the distance between the center of the positive electrode post (14) and the edge of the positive electrode tab (113) is L8, and L8-L7-d1 / 2≥5mm.

4. The electric cell of claim 3, wherein, L8-L7+d1 / 2≤L1 / 2.

5. The electric cell of claim 4, wherein, 6. The electric core according to claim 3, wherein at least two first welding marks (20) are arranged on the positive electrode lug (111) in a direction perpendicular to the extending direction of the positive electrode lug (111). The distance between the two first welding marks (20) is in a range of 5mm-10mm.

7. The electric cell of claim 6, wherein, 8. The electric core according to claim 6, wherein one second welding mark (21) is arranged on the negative electrode lug (112). The total area of the first welding marks (20) on the positive electrode lug (111) is greater than the total area of the second welding mark (21) on the negative electrode lug (112).

9. The electric cell of claim 8, wherein, The size of each of the first welding marks (20) is the same as the size of the second welding mark (21).

10. The electric cell of claim 8, wherein, 11. The electric core according to claim 10, wherein the width of the first welding mark (20) and the width of the second welding mark (21) are in a range of 6mm-10mm, and the length of the first welding mark (20) and the length of the second welding mark (21) are in a range of 15mm-20mm.

12. The electric core according to claim 1, further comprising a positive electrode connecting tab (12) and a negative electrode connecting tab (13). The positive electrode connecting tab (12) is connected with the positive electrode lug (111), and the length of the positive electrode connecting tab (12) is D1. The negative electrode connecting tab (13) is connected with the negative electrode lug (112), and the length of the negative electrode connecting tab (13) is D5. D1 / D5 = k, and k is in a range of 1.3≤n≤1.

5. wherein ​ 13. The electric cell of claim 12, wherein, The distance between the positive tab (111) and the negative tab (112) is 22-35 mm, and the distance between the positive connecting piece (12) and the negative connecting piece (13) is 35-40 mm.

14. The electric cell of claim 12, wherein, In the direction perpendicular to the extension direction of the positive tab (111), the distance between the side of the positive tab (111) away from the negative tab (112) and the edge of the positive tab (113) is L7, and the distance between the side of the positive connecting piece (12) away from the negative connecting piece (13) and the edge of the positive tab (113) is L15, L7≥L15.

15. The electric cell of claim 12, wherein, The distance between the side of the negative tab (112) away from the positive tab (111) and the edge of the negative tab (114) is L11, which is 30-40 mm; and the distance between the center of the positive column (14) and the center of the negative column (15) is L13, which is 125-130 mm.

16. The electric cell of claim 15, wherein, The number of the core packs (11) is two, the positive connecting piece (12) comprises a first connecting part (121), a second connecting part (122) and a first intermediate part (123), and the negative connecting piece (13) comprises a third connecting part (131), a fourth connecting part (132) and a second intermediate part (133). The first connecting part (121) and the second connecting part (122) are respectively welded with the positive tab (111) of the two core packs (11), and the third connecting part (131) and the fourth connecting part (132) are respectively welded with the negative tab (112) of the two core packs (11).

17. The electric cell of claim 16, wherein, The third connecting part (131) and the fourth connecting part (132) are both arranged at one end of the second intermediate part (133) close to the positive connecting piece (12), the second intermediate part (133) connects the third connecting part (131) and the fourth connecting part (132), and the second intermediate part (133) covers the negative column (15). The first connecting part (121) and the second connecting part (122) are respectively located at two sides of the first intermediate part (123), the first intermediate part (123) is connected between the first connecting part (121) and the second connecting part (122), and the first intermediate part (123) covers the positive column (14).

18. The electric cell of claim 17, wherein, In the extension direction of the second connecting part (122), the distance between the side edge of the first intermediate part (123) close to the negative connecting piece (13) and the side edge of the second connecting part (122) close to the negative connecting piece (13) is 30-33 mm.

19. The electric cell of claim 18, wherein, In the direction of the first connecting part (121), the first intermediate part (123) and the second connecting part (122) being connected in sequence, the length of the first intermediate part (123) first decreases and then increases.

20. The electrically core of claim 16, wherein, The ratio of the width of the first connecting part (121), the width of the second connecting part (122) and the spacing between the first connecting part (121) and the second connecting part (122) is 1:1:

1.

21. The electrically core of claim 1, wherein, The width L3 of the positive electrode tab (113) in the direction perpendicular to the extension direction of the positive electrode tab (111) is 1mm-3mm less than the width L4 of the negative electrode tab (114) in the direction perpendicular to the extension direction of the negative electrode tab (112), and the width L5 of the positive electrode tab (111) in the direction parallel to the extension direction of the positive electrode tab (111) is 1mm-3mm greater than the width L6 of the negative electrode tab (112) in the direction parallel to the extension direction of the negative electrode tab (112).

22. The electrically core of claim 1, wherein, L1 is 70mm-80mm, and L2 is 40mm-50mm.

23. The cell of any one of claims 1-22, wherein, The angle between the positive electrode tab (111) and the outer side of the positive electrode tab (113) is an obtuse angle, and the angle between the negative electrode tab (112) and the outer side of the negative electrode tab (114) is an obtuse angle.

24. The electrically cell of claim 23, wherein, The angle between the positive electrode tab (111) and the outer side of the positive electrode tab (113) is in the range of 92°-100°, and the angle between the negative electrode tab (112) and the outer side of the negative electrode tab (114) is in the range of 92°-100°.

25. The cell of any one of claims 1-22, wherein, The core package (11) is a laminated core package (11).

26. A battery, comprising: The battery cell (10) as claimed in any one of claims 1-25, a protective film layer, and a shell (31) are provided, the protective film layer is wrapped on the outer surface of the battery cell (10), and the battery cell (10) and the protective film layer are arranged in the shell (31).

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