Collecting plate and battery thereof
By creating through holes in the current collector, the problem of difficult gas discharge from inside the battery was solved, achieving a balance between effective venting and structural strength, thus improving the battery's performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2026-03-06
AI Technical Summary
Gases generated during battery storage and operation cannot be effectively released, leading to increased internal pressure and affecting battery performance.
Through holes are made on the manifold plate, with the total area of the through holes accounting for 0-95% of the plate area, to provide gas discharge channels and ensure the overall strength and flow capacity of the manifold plate.
The through-hole design allows for the effective discharge of gas inside the battery, reducing internal pressure and improving the battery's venting effect, while maintaining the structural strength and current conduction capacity of the current collector.
Smart Images
Figure CN223978050U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically to a current collector and its battery. Background Technology
[0002] A battery typically consists of a casing, cells, and current collectors. During battery manufacturing, one end of the current collector is usually welded to the cell, and then the cell and current collector are placed in the casing. The other end of the current collector is then connected to the terminal, thus forming a current path.
[0003] Batteries generate gas during storage and operation. This gas accumulates inside the battery, causing a gradual increase in internal pressure, necessitating venting and pressure relief. However, current technologies often suffer from poor venting performance, impacting battery performance. Utility Model Content
[0004] The embodiments of this application provide a manifold and its battery, which can solve the technical problem of poor battery venting performance, affecting the battery's performance.
[0005] In a first aspect, embodiments of this application provide a data collection disk, comprising:
[0006] The disc body has through holes;
[0007] Wherein, the total area of the through holes is S 通孔 The total area of the disk is S 盘体 , 0 < S 通孔 / S 盘体 ≤95%.
[0008] In one embodiment, 0% < S 通孔 / S 盘体 ≤45%.
[0009] In one embodiment, the through hole includes a first through hole, which is disposed in the central region of the disk body.
[0010] In one embodiment, the area of the first through hole is S. 第一通孔 2%≤S 第一通孔 / S 盘体 ≤14%.
[0011] In one embodiment, the through hole further includes a second through hole.
[0012] In one embodiment, the area of the first through hole is S. 第一通孔 The area of the second through hole is S 第二通孔 5% ≤ S 第一通孔 / S 第二通孔 ≤300%.
[0013] In one embodiment, 50% ≤ S 第一通孔 / S 第二通孔 ≤200%.
[0014] In one embodiment, the shortest distance between the second through hole and the first through hole is W1, 0.2mm≤W1≤10mm.
[0015] In one embodiment, the shortest distance between the centroid of the first through hole and the wall of the second through hole is L1;
[0016] The portion of the disk body centered on the centroid of the first through hole and with a radius of L1 is the first connecting part;
[0017] The thickness of the first connecting part is T 第一衔接部 0.002mm≤T 第一衔接部 ≤2mm.
[0018] In one embodiment, the number of the second through holes is multiple.
[0019] In one embodiment, a plurality of second through holes are spaced evenly around the outer periphery of the first through hole.
[0020] In one embodiment, a plurality of second through holes are arranged symmetrically about the first through hole.
[0021] In one embodiment, at least two of the second through holes have different shapes; or
[0022] Each of the second through holes has the same shape; or
[0023] At least one of the second through holes has a shape that is different from the shape of the first through hole; or
[0024] The shape of each second through hole is the same as the shape of the first through hole.
[0025] In one embodiment, the shortest distance between two adjacent second through holes is W2, where 2mm ≤ W2 ≤ 30mm.
[0026] In one embodiment, the shortest distance between the centroid of the first through hole and the wall of the second through hole is L1, and the portion of the disk body centered on the centroid of the first through hole and with a radius of L1 is the first connecting part;
[0027] The longest distance between the centroid of the first through hole and the wall of the second through hole is L2, and the portion of the disk body with the centroid of the first through hole as the center and L2 as the radius is the pressure relief part;
[0028] The pressure relief section is composed of the first connecting section and the second connecting section.
[0029] In one embodiment, the thickness of the second connecting portion is T. 第二衔接部 0.002mm≤T 第二衔接部 ≤2mm.
[0030] In one embodiment, the second connecting portion is provided with a reinforcing structure, which is used to reduce the strength of the second connecting portion.
[0031] In one embodiment, the reinforcing structure includes openings.
[0032] In one embodiment, the area of the opening is S. 开孔 The area of the second connecting part is S 第二衔接部 2%≤S 开孔 / S 第二衔接部 ≤90%.
[0033] In one embodiment, the reinforcing structure includes a groove.
[0034] In one embodiment, the groove has a bottom wall with a thickness of T. 底壁 The thickness of the second connecting part is T 第二衔接部 5%≤T 底壁 / T 第二衔接部 ≤50%.
[0035] In one embodiment, the groove has a bottom wall with an area of S. 底壁 The area of the second connecting part is S 第二衔接部 2%≤S 底壁 / S 第二衔接部 ≤90%.
[0036] Secondly, embodiments of this application provide a battery, including a cell and a current collector as described above.
[0037] In one embodiment, the cell energy is E, 25Wh / mm². 2 ≤E / S 通孔 ≤80Wh / mm 2 .
[0038] In one embodiment, the battery cell has a liquid injection channel in the middle, and the side of the liquid injection channel facing the disk has a liquid inlet, which is disposed opposite to at least a portion of the through hole.
[0039] In one embodiment, the liquid inlet and the through hole overlap along the central axis of the battery cell, with an overlap area of S. 重叠 50% < S 重叠 / S 通孔 ≤100%.
[0040] In one embodiment, the battery cell includes a tab, the height of which along the axial direction of the battery is H, where 0 mm < H ≤ 10 mm.
[0041] Thirdly, embodiments of this application provide a battery including a current collector, the current collector comprising a disk body, the disk body having through holes; wherein, the total area of the through holes is S. 通孔 The total area of the disk is S 盘体 , 0 < S 通孔 / S 盘体 ≤95%.
[0042] The beneficial effects of the embodiments of this application are as follows:
[0043] The current collector in this embodiment includes a disk body with through holes; wherein the total area of the through holes is S. 通孔 The total area of the disk is S 盘体 , 0 < S 通孔 / S 盘体 ≤95%. In this application, by providing a through hole on the disk body, the through hole provides an exhaust outlet for the gas inside the battery. When the gas pressure inside the battery rises to a certain level, the gas can be discharged to the outside of the battery through the through hole, thereby reducing the internal pressure of the battery and improving the venting effect of the battery; in addition, 0 < S 通孔 / S 盘体 ≤95% ensures that the collector plate improves battery venting while maintaining its overall strength and current carrying capacity. Attached Figure Description
[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0045] Figure 1 This is a top view of the collector disk provided in one embodiment of this application;
[0046] Figure 2 This is a top view of the collector disk provided in one embodiment of this application;
[0047] Figure 3 This is a top view of the collector disk provided in one embodiment of this application;
[0048] Figure 4 This is a top view of the collector disk provided in one embodiment of this application;
[0049] Figure 5This is a top view of the collector disk provided in one embodiment of this application;
[0050] Figure 6 This is a top view of the collector disk provided in one embodiment of this application;
[0051] Figure 7 This is an exploded view of the current collector and battery cell provided in an embodiment of this application;
[0052] Figure 8 This is a cross-sectional schematic diagram of a battery provided in an embodiment of this application;
[0053] Figure 9 This is a cross-sectional schematic diagram of a portion of the battery provided in an embodiment of this application.
[0054] Figure label:
[0055] 100. Battery; 1. Current collector; 11. Disc body; 111. Through hole; 112. First through hole; 113. Second through hole; 114. First connecting part; 115. Second connecting part; 116. Pressure relief part; 117. Opening; 118. Groove; 2. Battery cell; 21. Tab; 22. Liquid injection channel; 23. Liquid inlet. Detailed Implementation
[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.
[0057] Please refer to Figure 1 and Figure 2 The current collector 1 of this application includes a plate body 11, on which through holes 111 are formed; wherein, the total area of the through holes 111 is S. 通孔 The total area of disk 11 is S 盘体 , 0 < S 通孔 / S 盘体≤95%. In this application, by providing a through hole 111 on the disk body 11, the through hole 111 provides an exhaust outlet for the gas inside the battery 100. When the gas pressure inside the battery 100 rises to a certain level, the gas can be discharged to the outside of the battery 100 through the through hole 111, thereby reducing the internal pressure of the battery 100 and improving the exhaust effect of the battery 100; in addition, 0 < S 通孔 / S 盘体 ≤95%, which ensures that the current collector 1 improves the exhaust effect of battery 100 while ensuring the overall strength and current carrying capacity of the current collector 1.
[0058] Optional, S 通孔 / S 盘体 The value can be any one or any two of the following: 0.1%, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 50%, 60%, 70%, 80%, 90%, 95%.
[0059] In this embodiment, the shape of the through hole 111 is not limited; it can be circular, rectangular, trapezoidal, sector-shaped, triangular, elliptical, or other shapes. The position of the through hole 111 is also not limited; for example, referring to… Figure 1 The through hole 111 can be located in the central area of the disk body 11; for example, refer to Figure 2 The through hole 111 can be set in the edge area of the disk body 11; for example, the through hole 111 can be distributed in both the edge area and the center area of the disk body 11. The number of through holes 111 is not limited, and there can be one, two or more through holes 111.
[0060] In one embodiment, 0% < S 通孔 / S 盘体 ≤45%, optional, S 通孔 / S 盘体 The value can be any one or any two of the following: 0.1%, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%.
[0061] In one embodiment, reference Figures 3 to 6The through hole 111 includes a first through hole 112, which is located in the central region of the disk body 11. The shape of the first through hole 112 is not limited; it can be circular, rectangular, trapezoidal, fan-shaped, triangular, elliptical, or other shapes. In this embodiment, the first through hole 112 is located in the central region of the disk body 11. On the one hand, this facilitates the injection of electrolyte into the center of the battery cell 2 through the first through hole 112, allowing the electrolyte to wet all parts of the battery cell 2 more quickly and evenly, thus improving the wetting effect. On the other hand, since the first through hole 112 is located in the central region of the disk body 11, it plays a positioning role during the assembly or processing of the current collector 1, thereby improving the assembly accuracy and efficiency of the current collector 1.
[0062] In one embodiment, the area of the first through hole 112 is S. 第一通孔 2%≤S 第一通孔 / S 盘体 ≤14%. Optional, S 第一通孔 / S 盘体 The value can be any one or any two of the following: 2%, 3%, 5%, 7%, 9%, 11%, 13%, 14%. In this embodiment, when S... 第一通孔 / S 盘体 When the value of S is too large, it can easily lead to an excessively large area of the first through hole 112, reducing the strength, flatness, and flow capacity of the disc 11. The disc 11 is also more prone to deformation under external force, and the difficulty of welding the disc 11 to other components increases. 第一通孔 / S 盘体 If the value is too small, the area of the first through hole 112 will be too small, which is not conducive to improving the efficiency and convenience of injecting electrolyte into the middle of the cell 2.
[0063] In one embodiment, reference Figures 3 to 6 The through hole 111 also includes a second through hole 113. The shape of the second through hole 113 is not limited, and the shape of the second through hole 113 can be circular, rectangular, trapezoidal, sector-shaped, triangular, elliptical, etc. The number of second through holes 113 is not limited, and there can be one, two or more second through holes 113.
[0064] In one embodiment, the area of the second through hole 113 is S. 第二通孔 5% ≤ S 第一通孔 / S 第二通孔 ≤300%. Optional, S 第一通孔 / S 第二通孔 The value can be any one or any two of the following: 5%, 10%, 30%, 50%, 70%, 100%, 150%, 200%, 250%, 300%. In this embodiment, when S... 第一通孔 / S 第二通孔When the value is too large, it can easily lead to an excessively large area of the first through-hole 112 and an excessively small area of the second through-hole 113. Most of the gas in the battery 100 will be discharged through the first through-hole 112, while the gas discharge rate at the second through-hole 113 of the collector plate 1 is slower, easily causing gas stagnation or accumulation in the area near the second through-hole 113, resulting in an unbalanced pressure distribution inside the battery 100; when S 第一通孔 / S 第二通孔 If the value is too small, the area of the first through hole 112 will be too small, which is not conducive to improving the efficiency and convenience of injecting electrolyte into the middle of the cell 2. At the same time, gas stagnation or accumulation is likely to form in the area near the first through hole 112, resulting in an unbalanced pressure distribution inside the battery 100.
[0065] In one embodiment, 50% ≤ S 第一通孔 / S 第二通孔 ≤200%. Optional, S 第一通孔 / S 第二通孔 The value can be any one or any two of the following: 50%, 60%, 70%, 80%, 90%, 100%, 130%, 150%, 180%, 200%. In this embodiment, S is... 第一通孔 / S 第二通孔 Setting the value in the range of 50%-200% can further ensure the venting effect of battery 100 and the efficiency and convenience of electrolyte injection into the middle of cell 2.
[0066] In one embodiment, the shortest distance between the second through hole 113 and the first through hole 112 is W1, where 0.2mm ≤ W1 ≤ 10mm. Optionally, the value of W1 can be any one or any two of the following: 0.2mm, 0.4mm, 0.8mm, 1.0mm, 2.0mm, 4.0mm, 6.0mm, 8.0mm, 10.0mm. In this embodiment, when the value of W1 is too large, it is easy to cause the shortest distance between the second through hole 113 and the first through hole 112 to be too large. When the battery 100 generates a large amount of gas due to abnormal conditions such as thermal runaway, the gas is not easy to break the disc 11 between the second through hole 113 and the first through hole 112 to expand the opening area and ventilation volume of the through hole 111. The exhaust effect of the battery 100 under abnormal conditions is not ideal. When the value of W1 is too small, it is easy to cause the shortest distance between the second through hole 113 and the first through hole 112 to be too small. The mechanical strength of the disc 11 between the second through hole 113 and the first through hole 112 is too low. During storage, processing or use, the disc 11 between the second through hole 113 and the first through hole 112 is prone to breakage.
[0067] In one embodiment, reference Figure 4The shortest distance between the centroid of the first through hole 112 and the wall of the second through hole 113 is L1; the portion of the disk 11 centered on the centroid of the first through hole 112 and with a radius of L1 is the first connecting part 114; the thickness of the first connecting part 114 is T. 第一衔接部 0.002mm≤T 第一衔接部 ≤2mm. Optional, T 第一衔接部 The value can be any one or any two of the following: 0.002mm, 0.004mm, 0.01mm, 0.04mm, 0.08mm, 0.1mm, 0.4mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.7mm, 2.0mm. In this embodiment, the centroid refers to the geometric center of the first through hole 112. In this embodiment, when T... 第一衔接部 When the value is too large, it can easily lead to excessive thickness of the first connecting part 114. When the battery 100 generates a large amount of gas due to abnormal conditions such as thermal runaway, the high-pressure gas is not easy to break through the first connecting part 114 to expand the opening area and ventilation volume of the through hole 111. The venting effect of the battery 100 under abnormal conditions is not ideal. 第一衔接部 If the value is too small, the thickness of the first connecting part 114 may be too small, the mechanical strength of the first connecting part 114 may be too low, and the first connecting part 114 may easily break during storage, processing or use of the collector plate 1.
[0068] In one embodiment, reference Figures 3 to 6 There are multiple second through holes 113, which are evenly spaced around the outer periphery of the first through hole 112. In this embodiment, the multiple second through holes 113 evenly spaced around the outer periphery of the first through hole 112 can improve the uniformity of force distribution and exhaust of the disc body 11.
[0069] In one embodiment, reference Figures 3 to 6 Multiple second through holes 113 are arranged symmetrically about the first through hole 112. The arrangement of multiple second through holes 113 symmetrically about the first through hole 112 can improve the uniformity of force distribution and exhaust of the disc body 11.
[0070] In one embodiment, the shapes of the first through hole 112 and the second through hole 113 are not limited. For example, at least two second through holes 113 may have different shapes; or each second through hole 113 may have the same shape; or at least one second through hole 113 may have a shape that is different from the shape of the first through hole 112; or each second through hole 113 may have the same shape as the first through hole 112.
[0071] In one embodiment, the shortest distance between two adjacent second through holes 113 is W2, where 2mm ≤ W2 ≤ 30mm. Optionally, the value of W2 can be any one or any two of 2mm, 4mm, 6mm, 8mm, 10mm, 14mm, 18mm, 20mm, 24mm, 26mm, 28mm, 30mm, etc. In this embodiment, when the value of W2 is too large, the shortest distance between the two second through holes 113 is easily too large. When the battery 100 generates a large amount of gas due to abnormal conditions such as thermal runaway, the high-pressure gas is not easy to break through the disc 11 between the two second through holes 113 to expand the opening area and ventilation volume of the through holes 111, and the venting effect of the battery 100 under abnormal conditions is not ideal. When the value of W2 is too small, the shortest distance between the two second through holes 113 is easily too small, and the disc 11 between the two second through holes 113 is easily broken during storage, processing, or use of the collector plate 1.
[0072] In one embodiment, reference Figure 4 The shortest distance between the centroid of the first through hole 112 and the wall of the second through hole 113 is L1. The portion of the disk 11 centered on the centroid of the first through hole 112 and with a radius of L1 is the first connecting part 114. The longest distance between the centroid of the first through hole 112 and the wall of the second through hole 113 is L2. The portion of the disk 11 centered on the centroid of the first through hole 112 and with a radius of L2 is the pressure relief part 116. The pressure relief part 116 is composed of a first connection and a second connecting part 115. In this embodiment, the centroid is the geometric center of the first through hole 112, and the remaining pressure relief parts 116 other than the first connecting part 114 are the second connecting parts 115.
[0073] In one embodiment, the thickness of the second connecting portion 115 is T. 第二衔接部 0.002mm≤T 第二衔接部 ≤2mm. Optional, T 第二衔接部 The value can be any one or any two of the following: 0.002mm, 0.004mm, 0.01mm, 0.04mm, 0.08mm, 0.1mm, 0.4mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.7mm, 2.0mm. In this embodiment, when T... 第二衔接部 When the value is too large, it can easily lead to excessive thickness of the second connection part 115. When the battery 100 generates a large amount of gas due to abnormal conditions such as thermal runaway, the high-pressure gas is not easy to break through the second connection part 115 to expand the opening area and ventilation volume of the through hole 111, resulting in unsatisfactory venting effect of the battery 100; when T 第二衔接部 If the value is too small, the thickness of the second connecting part 115 may be too small, and the mechanical strength of the second connecting part 115 may be too low. During storage, processing or use, the second connecting part 115 may easily break.
[0074] In one embodiment, reference Figure 5 and Figure 6 The second connecting portion 115 is provided with a reinforcing structure, which is used to reduce the strength of the second connecting portion 115. In this embodiment, the reinforcing structure makes the second connecting portion 115 more prone to deformation. When high-pressure gas breaks the second connecting portion 115, the reinforcing structure facilitates the second connecting portion 115 to bend or deform along the reinforcing structure under the impact of high-pressure gas, thereby expanding the opening area and ventilation volume of the through hole 111 and improving the venting effect of the battery 100.
[0075] In one embodiment, reference Figure 5 The reinforcing structure includes an opening 117. In this embodiment, the shape of the opening 117 is not limited; it can be circular, rectangular, trapezoidal, sector-shaped, triangular, elliptical, or other shapes. The number of openings 117 is not limited; there can be one, two, or more openings 117.
[0076] In one embodiment, the area of the opening 117 is S. 开孔 The area of the second connecting part 115 is S. 第二衔接部 2%≤S 开孔 / S 第二衔接部 ≤90%. S 开孔 / S 第二衔接部 The value can be any one or any two of the following: 2%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 50%, 60%, 70%, 80%, 90%. In this embodiment, if S... 开孔 / S 第二衔接部 If the value is too large, it can easily lead to an excessively large area of the opening 117 and insufficient overall strength of the second connecting part 115. This can cause the second connecting part 115 to easily break during the machining of the collector plate 1. If S 开孔 / S 第二衔接部 If the value is too small, it will easily lead to the area of the opening 117 being too small, and the effect of the opening 117 in reducing the strength of the second connection 115 will not be ideal.
[0077] In one embodiment, reference Figure 6 The reinforcing structure includes a groove 118. In this embodiment, the shape of the groove 118 is not limited; the shape of the groove 118 can be circular, rectangular, trapezoidal, sector-shaped, triangular, elliptical, etc. The number of grooves 118 is not limited; there can be one, two, or more grooves 118.
[0078] In one embodiment, the groove 118 has a bottom wall with a thickness of T. 底壁 The thickness of the second connecting part 115 is T. 第二衔接部 5%≤T底壁 / T 第二衔接部 ≤50%. Optional, T 底壁 / T 第二衔接部 The value can be any one or any two of the following: 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 50%. In this embodiment, if T... 底壁 / T 第二衔接部 If the value of T is too small, it can easily lead to insufficient thickness of the bottom wall and insufficient overall strength of the second connecting part 115. During the machining of the collector plate 1, the second connecting part 115 is prone to breakage. 底壁 / T 第二衔接部 If the value is too large, it can easily lead to an excessively thick bottom wall, and the effect of the groove 118 in reducing the strength of the second connecting part 115 will not be ideal.
[0079] In one embodiment, the groove 118 has a bottom wall with an area of S. 底壁 The area of the second connecting part 115 is S. 第二衔接部 2%≤S 底壁 / S 第二衔接部 ≤90%. Optional, S 底壁 / S 第二衔接部 The value can be any one or any two of the following: 2%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 50%, 60%, 70%, 80%, 90%. In this embodiment, if S... 底壁 / S 第二衔接部 If the value is too large, it can easily lead to an excessively large bottom wall area and insufficient overall strength of the second connection 115, making it prone to breakage during the machining of the collector plate 1; if S 底壁 / S 第二衔接部 If the value is too small, the groove 118 may not effectively reduce the strength of the second connecting part 115.
[0080] This application also provides a battery 100, for reference. Figures 7 to 9 The battery 100 includes a cell 2 and a current collector 1 as described above.
[0081] In one embodiment, the energy of cell 2 is E, 25Wh / mm². 2 ≤E / S 通孔 ≤80Wh / mm 2 Optional, E / S 通孔 The value can be 25Wh / mm 2 30Wh / mm 2 35Wh / mm 2 40Wh / mm 2 45Wh / mm 250Wh / mm 2 55Wh / mm 2 60Wh / mm 2 65Wh / mm 2 70Wh / mm 2 80Wh / mm 2 The range between any one or any two of them.
[0082] In this embodiment, under the same conditions, the higher the energy of cell 2, the greater the gas production of battery 100. If E / S 通孔 When the value is too large, it can easily lead to excessive energy in cell 2 and insufficient area in through hole 111, preventing the gas generated by battery 100 from being discharged effectively through through hole 111 in a timely manner, thus reducing the venting effect of collector 1; if E / S 通孔 If the value is too small, it can easily lead to an excessively large area of the through hole 111, reducing the mechanical strength, flow capacity, and flatness of the collector plate 1.
[0083] In one embodiment, reference Figure 7 and Figure 8 The battery cell 2 has a liquid injection channel 22 in the middle, and a liquid inlet 23 is provided on the side of the liquid injection channel 22 facing the disk body 11. The liquid inlet 23 is arranged opposite to at least a portion of the through hole 111. In this embodiment, the liquid inlet 23 is arranged opposite to at least a portion of the through hole 111. When adding electrolyte, the electrolyte can be directly added to the liquid injection channel 22 in the middle of the battery cell 2 through the through hole 111, which can improve the efficiency and uniformity of electrolyte wetting of the battery cell 2.
[0084] In one embodiment, the liquid inlet 23 and the through hole 111 overlap along the central axis of the cell 2, with an overlap area of S. 重叠 50% < S 重叠 / S 通孔 ≤100%. Optional, S 重叠 / S 通孔 The value can be any one or any two of 50%, 60%, 70%, 80%, 90%, 100%, etc. In this embodiment, S is... 重叠 / S 通孔 Setting the value between 50% and 100% can further ensure the electrolyte injection effect.
[0085] In one embodiment, reference Figure 9The battery cell 2 includes tabs 21, the height of which along the axial direction of the battery 100 is H, where 0mm < H ≤ 10mm. Optionally, the value of H can be any one or any two of 0.001mm, 0.1mm, 2.0mm, 4.0mm, 6.0mm, 8.0mm, and 10.0mm. In this embodiment, when the disc body 11 is positioned above the battery cell 2, some tabs may deform and arch upwards through the through-holes 111 of the disc body. Setting the value of H within the aforementioned range can reduce the wear caused by the tabs 21 protruding upwards from the disc body 11 and contacting other components above the disc body 11.
[0086] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A current collector plate, characterized by, Comprising: a disc body having a through hole; The total area of the through holes is S 通孔 The total area of the disc body is S 盘体 0 < S 通孔 / S 盘体 ≤ 95%, the through holes include a first through hole and a second through hole, and the shortest distance between the centroid of the first through hole and the hole wall of the second through hole is L1. a portion of the disc body centered on the centroid of the first through hole and having a radius of L1 is a first connecting portion; The thickness of the first link is T 第一衔接部 , 0.002mm≤T 第一衔接部 ≤2mm.
2. The current plate of claim 1, wherein 0% < S 通孔 / S 盘体 ≤ 45%.
3. The current collecting disc according to claim 1, wherein the first through hole is arranged in a central region of the disc body.
4. The current collecting disc according to claim 3, wherein The area of the first through hole is S 第一通孔 , 2%≤S 第一通孔 / S 盘体 ≤14%.
5. The current plate of claim 1, wherein The area of the first through hole is S 第一通孔 , the area of the second through hole is S 第二通孔 , 5%≤S 第一通孔 / S 第二通孔 ≤300%.
6. The current plate of claim 5, wherein, 50% < S 第一通孔 / S 第二通孔 ≤ 200%.
7. The current plate of claim 1, wherein a shortest distance between the second through hole and the first through hole is W1, 0.2mm≤W1≤10mm.
8. The current plate of claim 1, wherein the number of the second through holes is multiple.
9. The current plate of claim 8, wherein, the multiple second through holes are uniformly spaced around the outer periphery of the first through hole.
10. The current plate of claim 8, wherein, the multiple second through holes are arranged in central symmetry with respect to the first through hole.
11. The current collecting disc according to claim 8, wherein the shapes of at least two of the second through holes are different from each other; or the shapes of each of the second through holes are the same; or the shape of at least one of the second through holes is different from the shape of the first through hole; or the shapes of each of the second through holes are the same as the shape of the first through hole.
12. The current plate of claim 1, wherein, a shortest distance between two adjacent second through holes is W2, 2mm≤W2≤30mm.
13. The current collecting disc according to claim 1, wherein a longest distance between the centroid of the first through hole and the hole wall of the second through hole is L2, a portion of the disc body centered on the centroid of the first through hole and having a radius of L2 is a pressure relief portion; the pressure relief portion is composed of the first connecting portion and a second connecting portion.
14. The current collecting disc according to claim 13, wherein The second link portion has a thickness T 第二衔接部 , 0.002mm≤T 第二衔接部 ≤2mm.
15. The current collecting disc according to claim 13, wherein a weakening structure is arranged on the second connecting portion, the weakening structure is used to reduce the strength of the second connecting portion.
16. The current plate of claim 15, wherein, the weakening structure comprises a hole.
17. The current collecting disc according to claim 16, wherein The area of the opening is S 开孔 , the area of the second engaging portion is S 第二衔接部 , 2%≤S 开孔 / S 第二衔接部 ≤90%.
18. The current plate of claim 15, wherein, the weakening structure comprises a groove.
19. The current plate of claim 18, wherein, The recess has a bottom wall, the thickness of which is T 底壁 , the thickness of the second link is T 第二衔接部 , 5 %≤T 底壁 / T 第二衔接部 ≤50 %.
20. The current plate of claim 18, wherein, The recess has a bottom wall, the area of the bottom wall being S 底壁 , the area of the second engaging portion being S 第二衔接部 , 2%≤S 底壁 / S 第二衔接部 ≤90%.
21. A battery, characterized by a battery cell and a current collecting disc according to any one of claims 1 to 20.
22. The battery according to claim 21, wherein The cell energy of the cell is E, 25 Wh / mm 2 ≤E / S 通孔 ≤80 Wh / mm 2 .
23. The battery of claim 21, wherein, a middle portion of the battery cell has a liquid injection channel, a liquid inlet is arranged on a side of the liquid injection channel facing the disc body, and the liquid inlet is arranged opposite to at least part of the through holes.
24. The battery of claim 23, wherein, The liquid inlet overlaps with the through hole in the direction of the central axis of the battery cell, and the overlapping area is S 重叠 , 50% < S 重叠 / S 通孔 ≤100%.
25. The battery of claim 21, wherein, the battery cell comprises a tab, a height of the tab along the axial direction of the battery is H, and 0mm<H≤10mm.
26. A battery, characterized by The collector plate comprises a plate body, and the plate body is provided with a through hole; wherein the total area of the through hole is S 通孔 , the total area of the plate body is S 盘体 , 0 通孔 <S 盘体 / 95%, the through hole comprises a first through hole and a second through hole, and the shortest distance between the centroid of the first through hole and the hole wall of the second through hole is L1; a portion of the disc body centered on the centroid of the first through hole and having a radius of L1 is a first connecting portion; The thickness of the first link is T 第一衔接部 , 0.002mm≤T 第一衔接部 ≤2mm.