Single battery and battery pack
By using a three-stage structure seal and the clamping method between the pole column and the connecting block in a single cell, the air leakage risk and space occupation problems caused by conventional riveting methods are solved, and higher sealing and battery safety and stability are achieved.
Patent Information
- Application Number
- CN202510197391.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-06-10
AI Technical Summary
In single cells, conventional riveting methods can easily lead to the risk of air leakage at the welding position, and the pole column structure cannot be processed in one go, occupying a high space and cost.
The seal with a three-stage structure, including a first sealing section, a second sealing section and a third sealing section, forms a stable connection through the clamping of the pole column and the connecting block, and prevents the leakage and leakage of electrolyte and external impurities through the seal.
Effectively prevent the leakage of substances inside the battery, enhance the sealing effect at the assembly holes, prevent the leakage of electrolyte, and prevent the entry of external air, improve the sealing, safety and stability of the battery, and extend the service life.
Smart Images
Figure CN120127306A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of battery technology, and specifically relates to a single cell and a battery pack. Background Art
[0002] In a single battery, it is usually necessary to rivet the pole and the rivet block to fix the pole on the cover body. However, in the conventional riveting method, there is a risk of air leakage at the welding position. Summary of the invention
[0003] Purpose of the invention: An embodiment of the present application provides a single cell battery, aiming to overcome the technical problem that the current fixing method of the pole easily leads to the risk of air leakage at the connection position; another purpose of the embodiment of the present application is to provide a battery pack.
[0004] Technical solution: The embodiment of the present application provides a single cell, comprising a cover plate assembly and an electrode assembly, wherein the electrode assembly is arranged on one side of the cover plate assembly along the thickness direction;
[0005] The cover assembly includes:
[0006] The cover plate body has an assembly hole;
[0007] The pole is inserted into the assembly hole and is partially located on a side of the cover body away from the electrode assembly;
[0008] A connection block is inserted into the assembly hole and is partially located on a side of the cover body facing the electrode assembly. The connection block is connected to the pole and is sandwiched between two sides of the cover body in the thickness direction.
[0009] The sealing member includes a first sealing segment, a second sealing segment and a third sealing segment. The first sealing segment is arranged along the circumferential direction and is located on the side of the cover plate body facing the electrode assembly, and is clamped between the connecting block and the cover plate body. The second sealing segment passes through the assembly hole and is located between the connecting block and the cover plate body, and is connected to the first sealing segment. The third sealing segment is connected to the side of the second sealing segment facing away from the first sealing segment, and is clamped between the pole and the connecting block.
[0010] In some embodiments, along the length direction of the cover plate assembly, the first sealing segment has a first size W 1 mm, the second sealing section has a second dimension W 2 mm, the third sealing segment has a third dimension W 3 mm, satisfying 1.1≤W 1 ≤2.0,0.5≤W 2 ≤0.75,0.8≤W 3 ≤1.7, and W 1 >W 3 .
[0011] In some embodiments, along the thickness direction of the cover plate assembly, the first sealing section has a thickness dimension Hmm before compression and a thickness dimension H 1 mm after compression, satisfying: 0.6 ≤ H 1 ≤ 0.8, 0.8 ≤ H ≤ 1.1, and 0.25 ≤ (H - H 1 ) / H ≤ 0.45;
[0012] And / or, the third sealing section has a thickness dimension M before compression and a thickness dimension H 2 mm after compression, satisfying: 0.6 ≤ H 2 ≤ 0.8, 0.8 ≤ M ≤ 1.1, and 0.25 ≤ (M - H 2 ) / M ≤ 0.45.
[0013] In some embodiments, the connecting block is provided with a through hole along the thickness direction, the pole column has a first convex portion protruding towards the inside of the assembly hole, and the first convex portion passes through the through hole and is connected to the connecting block.
[0014] In some embodiments, a counterbore is provided on one side of the connecting block facing away from the cover plate body, and the counterbore communicates with the through hole.
[0015] In some embodiments, the connecting block includes a connected first connecting portion and a first main body portion. The first connecting portion is arranged on the side of the cover plate body facing the electrode assembly, and the first main body portion partially passes through the assembly hole and is spaced from the cover plate body;
[0016] The first sealing section is clamped between the first connecting portion and the cover plate body; the second sealing section is arranged between the first main body portion and the cover plate body;
[0017] A first groove is jointly formed by the first main body portion and the pole column, the first groove communicates with the assembly hole, and the third sealing section is received in the first groove.
[0018] In some embodiments, the pole column includes a connected second connecting portion and a second main body portion. The second connecting portion is arranged on the side of the cover plate body facing away from the electrode assembly, the second main body portion partially passes through the assembly hole, and the first convex portion protrudes from the side of the second main body portion facing the connecting block.
[0019] In some embodiments, the first main body portion includes a first step and a second step arranged along the thickness direction. The first step is connected to the first connecting portion, the second step is connected to the first step and is located on the side of the first step away from the first connecting portion, and the first groove is located between the first step and the second main body portion.
[0020] In some embodiments, along the length direction of the cover plate assembly, the minimum dimension of the first sealing section from the outer edge of the first connecting portion is L mm, satisfying 0.5 ≤ L ≤ 1.0;
[0021] Along the length direction of the cover plate assembly, there is a gap between the third sealing section and the second step, and the gap has a minimum size G mm, satisfying 0.05≤G≤0.2.
[0022] The embodiment of the present application also discloses a battery pack, comprising a single cell as described in the above embodiment.
[0023] Beneficial effects: The single cell battery in the embodiment of the present application includes a cover assembly and an electrode assembly, and the electrode assembly is arranged on one side of the cover assembly along the thickness direction; the cover assembly includes a cover body, a pole, a connecting block and a sealing member, and the cover body has an assembly hole; the pole is passed through the assembly hole, and is partially located on the side of the cover body away from the electrode assembly; the connecting block is passed through the assembly hole, and is partially located on the side of the cover body facing the electrode assembly, and the connecting block is connected to the pole and is jointly clamped on both sides of the cover body along the thickness direction; the sealing member includes a first sealing section, a second sealing section and a third sealing section, the first sealing section surrounds the assembly hole and is located on the side of the cover body facing the electrode assembly, and is clamped between the connecting block and the cover body, the second sealing section is passed through the assembly hole and is located between the connecting block and the cover body, and is connected to the first sealing section, and the third sealing section is connected to the side of the second sealing section away from the first sealing section, and is clamped between the pole and the connecting block. A three-section seal is provided. The first sealing section can effectively prevent the electrolyte and other substances inside the battery from leaking out from the gap between the connecting block and the cover body. The second sealing section further strengthens the sealing effect at the assembly hole to prevent the electrolyte from leaking along the assembly hole. The third sealing section can prevent external air and other impurities from entering the battery, and also prevent the internal substances of the battery from leaking through the gap between the pole and the connecting block. Overall, the sealing of the battery is guaranteed, the safety and stability of the battery are improved, and the service life of the battery is extended.
[0024] The battery pack of the embodiment of the present application includes the single battery as described in the above embodiment, and thus can have all the technical features and technical effects of the above single battery, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.
[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of a single cell according to an embodiment of the present application;
[0027] Figure 2 This is a schematic diagram of the top view of the single cell structure of an embodiment of the present application;
[0028] Figure 3 is Figure 2 a schematic cross-sectional view in the A-A direction in
[0029] Figure 4 is Figure 3 a partially enlarged schematic view at position B in
[0030] Figure 5 is Figure 3 a partially enlarged schematic view at position C in
[0031] Figure 6 a three-dimensional structural schematic view of the seal in the cover plate assembly of the embodiment of the present application;
[0032] Figure 7 a half-sectional schematic view of the seal in the embodiment of the present application;
[0033] Explanation of reference numerals: 1, cover plate assembly; 2, electrode assembly; X, thickness direction; 11, cover plate body; 110, assembly hole; 12, pole column; 13, connection block; 14, seal; 141, first seal section; 142, second seal section; 143, third seal section; 130, through hole; 121, first convex part; 1300, sink; 131, first connection part; 132, first main body part; 133, first groove; 122, second connection part; 123, second main body part; 1321, first step; 1322, second step; Y, length direction; 15, upper plastic; 3, housing. Detailed implementation manners
[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.
[0035] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In the description of the present application, "a plurality" means two or more, and at least one means one, two or more, unless otherwise specifically defined. The terms "first", "second", "third", etc. are only used for naming the components or embodiments for convenience of description, and do not imply an important ranking between the components or embodiments.
[0036] It should also be noted that in the drawings of the present application, the arrow marked X indicates the thickness direction, and the arrow marked Y indicates the length direction. In the description of the present application, the thickness direction and the length direction are introduced in order to more clearly define the structure and relative position relationship of each component in the single cell.
[0037] As the preamble of the embodiments of the present application, in a single cell, it is usually necessary to rivet the pole and the rivet block to fix the pole on the cover body. However, the conventional riveting method generates an instantaneous impact on the cover body, which is easy to affect the stability of the explosion-proof valve, and there is a risk of air leakage at the welding position. At the same time, the rivet block occupies the space inside the single cell along the thickness direction, resulting in low space utilization; furthermore, the existing pole structure cannot be processed in one go, and the pole and the rivet block are both solid materials, the parts are heavy, and the cost is high.
[0038] In view of this, an embodiment of the present application provides a single cell battery, aiming to solve at least one of the above-mentioned technical problems.
[0039] See also Figures 1 to 7 As shown, an embodiment of the present application provides a single cell battery, including a cover plate assembly 1 and an electrode assembly 2, wherein the electrode assembly 2 is arranged on one side of the cover plate assembly 1 along the thickness direction X; the cover plate assembly 1 includes a cover plate body 11, a pole 12, a connecting block 13 and a seal 14; the single cell battery also includes a shell 3 for accommodating the electrode assembly 2 and supporting and protecting the electrode assembly 2. The cover body 11 has an assembly hole 110; the pole 12 is penetrated in the assembly hole 110 and is partially located on the side of the cover body 11 facing away from the electrode assembly 2; the connecting block 13 is penetrated in the assembly hole 110 and is partially located on the side of the cover body 11 facing the electrode assembly 2, the connecting block 13 is connected to the pole 12 and is jointly clamped on both sides of the cover body 11 along the thickness direction X; the sealing member 14 includes a first sealing section 141, a second sealing section 142 and a third sealing section 143, the first sealing section 141 is arranged along the circumferential direction and is located on the side of the cover body 11 facing the electrode assembly 2, and is clamped between the connecting block 13 and the cover body 11, the second sealing section 142 is penetrated in the assembly hole 110 and is located between the connecting block 13 and the cover body 11, and is connected to the first sealing section 141, and the third sealing section 143 is connected to the side of the second sealing section 142 facing away from the first sealing section 141, and is clamped between the pole 12 and the connecting block 13.
[0040] It should be understood that by connecting the terminal post 12 with the connecting block 13 and jointly clamping both sides of the cover plate body 11, the connection between the components of the cover plate assembly 1 becomes more stable. When the battery is subjected to external force impact or vibration, the relative positions of the components can be maintained unchanged, reducing the risk of battery failure caused by component loosening, and improving the overall structural strength and reliability of the battery. A three-section seal 14 is provided. The first seal section 141 can effectively prevent substances such as electrolyte inside the battery from leaking out through the gap between the connecting block 13 and the cover plate body 11. The second seal section 142 further enhances the sealing effect at the assembly hole 110, preventing the electrolyte from leaking along the assembly hole 110. The third seal section 143 can prevent external air and other impurities from entering the battery interior, and also prevent the substances inside the battery from leaking through the gap between the terminal post 12 and the connecting block 13. Overall, the sealing performance of the battery is ensured, the safety and stability of the battery are improved, and the service life of the battery is extended.
[0041] Specifically, the material of the seal 14 can be fluororubber with better electrolyte corrosion resistance. In some embodiments, the first seal section 141, the second seal section 142, and the third seal section 143 can adopt different sealing materials. For example, the first seal section 141 can adopt a fluororubber material with good chemical corrosion resistance to cope with the erosion of the seal 14 by the chemical substances that may be generated inside the battery; the second seal section 142 can adopt a silicone rubber material with high elasticity and good sealing performance, which can better fill the gap inside the assembly hole 110 and improve the sealing effect; the third seal section 143 can adopt a polyurethane rubber material with relatively high mechanical strength and wear resistance to adapt to the relative movement between the terminal post 12 and the connecting block 13 and ensure the durability of the seal.
[0042] Please refer to Figures 1 to 5 As shown, in some embodiments, along the length direction Y of the cover plate assembly 1, the first seal section 141 has a first dimension W 1 mm, the second seal section 142 has a second dimension W 2 mm, and the third seal section 143 has a third dimension W 3 mm, satisfying 1.1 ≤ W 1 ≤ 2.0, 0.5 ≤ W 2 ≤ 0.75, 0.8 ≤ W 3 ≤ 1.7, and W 1 >W 3 . It should be understood that the seal 14 is an overall annular structure. Among them, the first dimension W 1 of the first seal section 141 can be understood as the ring width dimension, that is, the minimum dimension along the length direction Y of the part of the seal 14 clamped between the cover plate body 11 and the connecting block 13; similarly, the second seal section 142 has a second dimension W 2, the third sealing section 143 has a third dimension W 3 can both be understood as the ring width dimension, where W 3 is the minimum dimension along the length direction Y of the part of the seal 14 sandwiched between the terminal post 12 and the connection block 13, and W 2 is the minimum dimension along the length direction Y of the remaining part of the seal 14 after removing the first sealing section 141 and the third sealing section 143.
[0043] Specifically, W 1 can be any value among 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm or a range value between two values. W 2 can be any value among 0.5mm, 0.6mm, 0.7mm, 0.75mm or a range value between two values. W 3 can be any value among 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm or a range value between two values. By restricting W 1 to be between 1.1mm and 2.0mm, it is ensured that the first sealing section 141 has sufficient width to form an effective sealing barrier to prevent impurities such as liquid and gas from entering the battery interior through the gap between the connection block 13 and the cover body 11. When W 1 is larger, the sealing path of the first sealing section 141 is longer and the sealing effect is better. At the same time, the size structure of the first sealing section 141 is also larger; on the contrary, when W 1 is smaller, the overall compactness and space layout of the battery are better. By restricting W 2 to be between 0.5mm and 0.75mm, it is ensured that the second seal 14 can better fill the gap in the assembly hole 110 (the extra space reserved between the part of the connection block 13 passing through the assembly hole 110 and the hole wall of the assembly hole 110), enhancing the sealing performance. At the same time, it ensures the normal assembly of the connection block 13 and the cover body 11 in the assembly hole 110, ensuring the connection tightness and reliability. By restricting W 3 to be between 0.8mm and 1.7mm, it can ensure that the third sealing section 143 has sufficient size to seal the gap between the terminal post 12 and the connection block 13, preventing liquid, gas, etc. from entering from this part. When W 3 is larger, the sealing path of the third sealing section 143 is longer and the sealing effect is better. At the same time, the size structure of the third sealing section 143 is also larger; on the contrary, when W 3 is smaller, the overall compactness and space layout of the battery are better, ensuring stable electrical and mechanical connections between the terminal post 12 and the connection block 13.
[0044] Furthermore, by defining W 1 >W 3 , when assembling the seal 14, the connection block 13 and the terminal 12, when the third sealing section 143 is compressed, it is blocked by the first sealing section 141 and cannot flow inward, so it flows toward the side away from the electrode assembly 2, which can more effectively fill the possible tiny gaps between the connection block 13 and the cover body 11, avoiding impurities such as liquid and gas from entering the battery interior through these gaps. At the same time, it ensures that the fit between the first sealing section 141 and the connection block 13 and the cover body 11 is closer and more stable, thus greatly improving the reliability of the sealing performance.
[0045] It should be understood that the dimensions of the sealing section can be optimized in coordination with the dimensions of the terminal 12, the connection block 13 and the cover body 11. For example, when the diameter of the terminal 12 is relatively large, the dimension of the third sealing section 143 can be appropriately increased to ensure the sealing effect between the terminal 12 and the connection block 13. At the same time, the dimensions of the first sealing section 141 and the second sealing section 142 can also be adjusted accordingly according to the dimensional changes of the terminal 12 and the connection block 13 to ensure the reliability of the entire sealing system.
[0046] Please refer to Figure 5 As shown, in some embodiments, along the thickness direction X of the cover assembly 1, the first sealing section 141 has a thickness dimension of H mm before compression, and the first sealing section 141 has a thickness dimension of H 1 mm after compression, satisfying: 0.6 ≤ H 1 ≤ 0.8, 0.8 ≤ H ≤ 1.1, and 0.25 ≤ (H - H 1 ) / H ≤ 0.45; and / or, the third sealing section 143 has a thickness dimension of Mmm before compression, and the third sealing section 143 has a thickness dimension of H 2 mm after compression, satisfying: 0.6 ≤ H 2 ≤ 0.8, 0.8 ≤ M ≤ 1.1, and 0.25 ≤ (M - H 2 ) / H ≤ 0.45. Specifically, H 1 or H 2 can be any value among 0.6mm, 0.7mm, 0.8mm or the range value between two values. H and M can be any value among 0.8mm, 0.9mm, 1.0mm, 1.1mm or the range value between two values. (H - H 1 ) / H or (M - H 2) / M can be any value among 0.25, 0.35, 0.45 or a range value between two values. It should be understood that by limiting the thickness dimension ranges of the first sealing section 141 and the second sealing section 142 before and after compression, it is ensured that the first sealing section 141 and the second sealing section 142 have sufficient materials to achieve a good sealing function. By limiting the compression ratios of the first sealing section 141 and the second sealing section 142, while ensuring the sealing effect, it can also have a certain elastic recovery ability to cope with situations such as vibration, thermal expansion and contraction that may occur during the use of the battery, and extend the service life of the sealing section.
[0047] Next, multiple embodiments are provided to illustrate the effects of the single battery of the present application. Among them, some common distance measurements can be selected to obtain H, M, H 1 and H 2 , for example, measuring tools such as vernier calipers and micrometers can be used to measure the corresponding dimensions above.
[0048] By disassembling the single battery and measuring the dimensional changes of the first sealing section 141 and the second sealing section 142 before and after compression, and detecting liquid leakage of the sealing member 14 itself and the sealing position, the sealing result of the cover plate assembly 1 in the single battery is verified.
[0049]
[0050] As shown in the above table, in Embodiments 1 to 3, H and M are in the range of 0.8 mm to 1.1 mm, H 1 and H 2 are in the range of 0.6 mm to 0.8 mm, (H - H 1 ) / H and (M - H 2 ) / M are both between 0.25 and 0.45, the compression amount of the sealing member 14 is reasonable and the sealing is normal; in Embodiment 4, H 1 and H 2 are 0.5 mm, (H - H 1 ) / H and (M - H 2 ) / M are 0.55. At this time, the sealing member 14 is over-compressed, the sealing member 14 cracks, and the sealing effect becomes poor; in Embodiment 7, H and M are 1.2 mm, (H - H 1 ) / H and (M - H 2 ) / M are 0.50. At this time, the sealing member 14 is over-compressed, the sealing member 14 cracks, and the sealing effect becomes poor; in Embodiment 5, H 1 and H 2 are 0.9, (H - H 1 ) / H and (M - H 2When (H - H 1 ) / H and (M - H 2 ) / M are 0.18, at this time, the compression amount of the sealing ring is insufficient, the assembly structure is unstable, the sealing performance deteriorates, and there is a risk of liquid leakage; in Embodiment 6, H and M are 0.7 mm, (H - H
[0051] Please refer to Figure 4 and Figure 5 As shown, in some embodiments, the connecting block 13 is provided with a through hole 130 along the thickness direction X, and the pole column 12 has a first convex portion 121 protruding inwardly toward the assembly hole 110. The first convex portion 121 passes through the through hole 130 and is connected to the connecting block 13. It should be understood that by setting the first convex portion 121 to pass through the through hole 130 of the connecting block 13 and be connected to the connecting block 13, the connection between the pole column 12 and the connecting block 13 is made more compact and firm, and it can better withstand external forces such as tensile force and torsional force during the use of the battery, effectively preventing loosening or detachment between the pole column 12 and the connecting block 13, thereby ensuring the reliability and stability of the electrical connection of the battery and enhancing the overall structural strength and service life of the battery. At the same time, through the connection method of the first convex portion 121 passing through the through hole 130, the contact area between the pole column 12 and the connecting block 13 is increased, which is beneficial to the smooth conduction of current. A larger contact area can reduce the contact resistance, reduce the loss of electrical energy during transmission, improve the charge and discharge efficiency of the battery, and enable the battery to better meet the requirements of high-power application scenarios. Furthermore, a positioning assembly is formed between the first convex portion 121 of the pole column 12 and the through hole 130 of the connecting block 13, improving the assembly efficiency and helping to ensure the relative position accuracy between components. In addition, it should also be understood that the connection part between the pole column 12 and the connecting block 13 is more compact, reducing the occupation of the internal space of the battery, improving the space utilization rate of the battery, and contributing to the miniaturization and lightweight design of the battery.
[0052] Specifically, after the first convex portion 121 of the terminal post 12 penetrates through the connecting block 13, a riveting hole can be formed by extrusion at the end of the first convex portion 121, so that an interference fit is formed between the end of the first convex portion 121 and the connecting block 13, initially realizing the positioning and assembly of the first convex portion 121 and the connecting block 13, strengthening the positioning stability and enhancing the connection. At the same time, the connection sealing performance is improved to a certain extent. The frictional force generated by the interference fit can effectively prevent the relative displacement between the terminal post 12 and the connecting block 13 due to factors such as vibration and temperature change during battery operation, ensuring that the terminal post 12 and the connecting block 13 always maintain an accurate relative position, thereby guaranteeing the stability of the overall battery structure and the reliability of the electrical connection. The preliminary positioning and assembly are achieved by extruding to form a riveting hole, which simplifies the entire assembly process. Without additional complex positioning tools or cumbersome adjustment steps, the operator only needs to perform a simple extrusion operation after the first convex portion 121 penetrates, and can quickly achieve preliminary positioning, greatly improving the assembly efficiency, reducing the labor cost, and also being beneficial to large-scale automated production.
[0053] Specifically, the shapes of the first convex portion 121 and the through hole 130 can be optimized according to actual needs. For example, the first convex portion 121 is designed as a polygon (such as a hexagon), and the through hole 130 is also a hexagon accordingly, which can increase the frictional force between the two and prevent relative rotation during use. Or the first convex portion 121 is designed in a shape with grooves, and protrusions matching the grooves are provided in the through hole 130. By this way of concave-convex matching, the connection stability and reliability are further enhanced.
[0054] Please refer to Figure 5 As shown in some embodiments, a counterbore 1300 is formed on the side of the connecting block 13 facing away from the cover plate body 11, and the counterbore 1300 communicates with the through hole 130. It should be understood that the counterbore 1300 can provide an observation space and an operation space for the first convex portion 121 to penetrate through the through hole 130, facilitating the welding and fixing of the first convex portion 121 and the connecting block 13, reducing the assembly difficulty, and improving the assembly efficiency. At the same time, the counterbore 1300 can accommodate the excess materials or debris that may be generated during the assembly process to a certain extent, so as to ensure the connection quality between the terminal post 12 and the connecting block 13. Furthermore, the connecting block 13 with the counterbore 1300 is lighter in weight, reduces the cost, and helps to realize the lightweight design of the battery. During the operation of the battery, the terminal post 12 and the connecting block 13 will generate a certain amount of heat. The existence of the counterbore 1300 can increase the surface area of the connection part, contribute to improving the heat dissipation efficiency, and dissipate the heat to the surrounding environment faster, thereby reducing the temperature inside the battery and ensuring the performance and life of the battery. Because the battery operates within a suitable temperature range, its charge and discharge efficiency and safety will be improved.
[0055] Please refer to Figure 5In some embodiments, as shown, the connection block 13 includes a connected first connection portion 131 and a first main body portion 132. The first connection portion 131 is disposed on the side of the cover plate body 11 facing the electrode assembly 2. The first main body portion 132 is partially inserted into the assembly hole 110 and is spaced apart from the cover plate body 11. The first sealing section 141 is clamped between the first connection portion 131 and the cover plate body 11. The second sealing section 142 is disposed between the first main body portion 132 and the cover plate body 11. The first main body portion 132 and the pole column 12 together define a first groove 133, and the first groove 133 communicates with the assembly hole 110. The third sealing section 143 is received in the first groove 133. It should be understood that through the structural design of the first connection portion 131 and the first main body portion 132, a stable connection structure is formed between the connection block 13, the cover plate body 11, and the pole column 12. The first connection portion 131 contacts the cover plate body 11 through the first sealing section 141, dispersing the stress received during battery use and preventing damage to the connection part due to excessive local force. The first main body portion 132 is inserted into the assembly hole 110, which not only provides reliable positioning for the connection block 13 but also forms a tight mechanical connection between the two by jointly clamping the third sealing section 143 with the pole column 12. This enables the entire structure to remain stable in the face of external forces such as vibration and impact, greatly enhancing the reliability of the battery structure. The second sealing section 142 is located between the first main body portion 132 and the cover plate body 11, further filling the gap in the assembly hole 110 to prevent impurities and moisture from entering the battery interior through the assembly hole 110 and strengthening the sealing effect. The third sealing section 143 is received in the first groove 133 defined between the first main body portion 132 and the pole column 12 and is jointly clamped by the two, ensuring the sealing of the connection between the pole column 12 and the connection block 13, preventing electrolyte leakage, and ensuring the stability of the battery internal environment. In addition, the design of the first groove 133 reduces the occupation of the internal space of the battery, improves the space utilization rate of the battery, and helps to achieve the miniaturization and lightweight design of the battery.
[0056] Specifically, in addition to the third sealing section 143 in the first groove 133, one or more layers of sealing sheets made of different materials can be added. For example, a sealing sheet made of polytetrafluoroethylene is further provided inside the third sealing section 143. Polytetrafluoroethylene has excellent chemical corrosion resistance and a low friction coefficient, which can further improve the sealing and wear resistance of the connection part between the pole column 12 and the connection block 13 and prevent damage to the seal 14 caused by friction.
[0057] Specifically, the first connection part 131 and the first main body part 132 can be made of different materials. The first connection part 131 can be made of a metal material with good conductivity and certain elasticity, such as a copper alloy, to ensure good electrical connection and close fit with the cover body 11; the first main body part 132 can be made of a metal material with higher strength, such as stainless steel, to enhance the overall structural strength of the connection block 13. At the same time, some protrusions or grooves can be processed on the surface of the first main body part 132 to cooperate with the second sealing section 142, increase the friction between the second sealing section 142 and the first main body part 132, and prevent the second sealing section 142 from being displaced during use.
[0058] See also Figure 5 In some embodiments shown in the figure, the pole 12 includes a second connecting portion 122 and a second main body 123 connected to each other, the second connecting portion 122 is arranged on the side of the cover body 11 away from the electrode assembly 2, the second main body 123 is partially penetrated in the assembly hole 110, and the first protrusion 121 is protruded on the side of the second main body 123 facing the connection block 13. It should be understood that the second main body 123 and the first main body 132 can cooperate and squeeze the third sealing section 143 to fix the local position of the seal 14 and ensure that the seal 14 reaches a sufficient elastic deformation, thereby reducing the assembly error and improving the assembly sealing. Furthermore, the upper plastic 15 is sandwiched between the second connecting portion 122 and the cover body 11, which can effectively play an insulating role, avoid unnecessary current conduction between the pole 12 and the cover body 11, and improve the safety and stability of the battery. At the same time, the upper plastic 15 has a certain elasticity, and can play a buffering role when the battery is subjected to external forces such as vibration and impact, reducing the rigid collision between the pole 12 and the cover body 11, protecting the battery structure from damage, and extending the battery life.
[0059] See also Figure 3 In some embodiments shown, the second main body 123 and the second connecting portion 122 are integrally formed; and / or, the second main body 123 and the first protrusion 121 are integrally formed. It should be understood that when the second main body 123, the second connecting portion 122 and the first protrusion 121 are integrally formed, they can be the positive electrode column 12 of the same material, or the negative electrode column 12 of the same material; when only the first protrusion 121 and the second main body 123 are integrally formed, the second main body 123 and the second connecting portion 122 can be compositely assembled, wherein the second main body 123 can be made of copper, and the second connecting portion 122 can be made of aluminum.
[0060] See also Figure 5In some embodiments, as shown, the first main body portion 132 includes a first step 1321 and a second step 1322 arranged along the thickness direction X. The first step 1321 is connected to the first connecting portion 131. The second step 1322 is connected to the first step 1321 and is located on the side of the first step 1321 away from the first connecting portion 131. The first groove 133 is located between the first step 1321 and the second main body portion 123. It should be understood that through the design of the first step 1321 and the second step 1322, a more precise positioning structure is provided for the seal 14 and the terminal 12. The connection between the first step 1321 and the first connecting portion 131 enables the first sealing section 141 to be more stably clamped between the first connecting portion 131 and the cover plate body 11, enhancing the reliability of the seal. The first groove 133 located between the first step 1321 and the second main body portion 123 provides a specific installation space for the third sealing section 143, further improving the sealing performance between the terminal 12 and the connection block 13, effectively preventing electrolyte leakage and external impurity intrusion. The stepped structure arranged along the thickness direction X increases the structural complexity and strength of the first main body portion 132. The first step 1321 and the second step 1322 cooperate with each other to better disperse the external force exerted on the battery during use, making the connection between the connection block 13, the terminal 12, and the cover plate body 11 more stable. Especially in the face of complex working conditions such as vibration and impact, the stepped structure can play a role in buffering and strengthening the support, avoiding loosening or damage of the connection part and ensuring the normal operation of the battery. The clear stepped structure makes the assembly process more convenient. During installation, the operator can quickly assemble the connection block 13 with the terminal 12 and the cover plate body 11 according to the position and shape of the steps, reducing the assembly error. At the same time, if fine-tuning of the components is required during the assembly process, the stepped structure also provides a clear reference and operating space, improving the assembly efficiency and quality.
[0061] Please refer to Figure 5 In some embodiments, as shown, along the length direction Y of the cover plate assembly 1, the minimum dimension of the first sealing section 141 from the outer edge of the first connecting portion 131 is L mm, satisfying 0.5 ≤ L ≤ 1.0; along the length direction Y of the cover plate assembly 1, there is a gap between the third sealing section 143 and the second step 1322, and the minimum dimension of the gap is G mm, satisfying 0.05 ≤ G ≤ 0.2. It should be understood that by setting the minimum dimension L between 0.5 mm and 1.0 mm, sufficient space is reserved for installing the lower plastic, ensuring a reasonable contact distance between the lower plastic and the connection block 13, accurately positioning the lower plastic on the cover plate body 11, and preventing the lower plastic from shifting in position due to slight external force or vibration, thus ensuring the stability of the entire internal structure of the battery.
[0062] Specifically, L can be any value among 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm or a range value between two values. A sufficient contact distance can effectively disperse external forces. When the battery is subjected to external impact or internal stress change, the lower plastic (not shown in the figure) will not have local stress concentration due to insufficient contact distance with the welding block, thereby avoiding displacement and deformation of the lower plastic.
[0063] By setting the minimum dimension G between 0.05 mm and 0.2 mm, it is avoided that the third sealing section 143 is damaged due to excessive extrusion by the pole 12 during assembly or battery use, ensuring the normal working performance of the sealing section. Specifically, G can be any value among 0.05 mm, 0.10 mm, 0.15 mm, 0.20 mm or a range value between two values. An appropriate gap does not affect the electrical connection between the pole 12 and the connection block 13, and at the same time can ensure good sealing performance.
[0064] The embodiment of the present application also discloses a battery pack, including the single battery as in the above embodiment. Therefore, it can have all the technical features and technical effects of the above single battery, which will not be elaborated here.
[0065] In the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0066] The above has introduced in detail a single battery and a battery pack provided by the embodiments of the present application, and specific examples have been used to elaborate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A single cell battery, characterized in that: It comprises a cover plate assembly and an electrode assembly, wherein the electrode assembly is arranged on one side of the cover plate assembly along the thickness direction; The cover plate assembly comprises: The cover plate body has an assembly hole; A pole, which is inserted into the assembly hole and partially located on a side of the cover body away from the electrode assembly; A connecting block is inserted into the assembly hole and is partially located on a side of the cover body facing the electrode assembly, wherein the connecting block is connected to the pole and is sandwiched between two sides of the cover body along the thickness direction; A seal, comprising a first sealing segment, a second sealing segment and a third sealing segment, wherein the first sealing segment is circumferentially arranged and located on the side of the cover plate body facing the electrode assembly, and is clamped between the connecting block and the cover plate body, the second sealing segment passes through the assembly hole and is located between the connecting block and the cover plate body, and is connected to the first sealing segment, and the third sealing segment is connected to the side of the second sealing segment facing away from the first sealing segment, and is clamped between the pole and the connecting block.
2. The single cell according to claim 1, characterized in that: Along the length direction of the cover plate assembly, the first sealing segment has a first size W1 mm, the second sealing segment has a second size W2 mm, and the third sealing segment has a third size W3 mm, satisfying 1.1≤W1≤2.0, 0.5≤W2≤0.75, 0.8≤W3≤1.7, and W1>W3.
3. The single cell according to claim 1, characterized in that: Along the thickness direction of the cover plate assembly, the first sealing section has a thickness dimension H mm before compression, and the first sealing section has a thickness dimension H1 mm after compression, satisfying: 0.6≤H1≤0.8, 0.8≤H≤1.1, and 0.25≤(H-H1) / H≤0.45; And / or, the third sealing segment has a thickness dimension M before compression, and the third sealing segment has a thickness dimension H2 mm after compression, satisfying: 0.6≤H2≤0.8, 0.8≤M≤1.1, and 0.25≤(M-H2) / M≤0.
45.
4. The single cell according to claim 1, characterized in that: The connection block is provided with a through hole along the thickness direction, and the pole has a first protrusion protruding toward the assembly hole, and the first protrusion passes through the through hole and is connected to the connection block.
5. The single cell according to claim 4, characterized in that: A sinking groove is formed on a side of the connection block away from the cover plate body, and the sinking groove is communicated with the through hole.
6. The single cell according to claim 4, characterized in that: The connecting block comprises a first connecting portion and a first main body portion connected to each other, the first connecting portion is arranged on a side of the cover plate body facing the electrode assembly, and the first main body portion is partially inserted into the assembly hole and spaced apart from the cover plate body; The first sealing section is sandwiched between the first connecting portion and the cover body; the second sealing section is disposed between the first main body and the cover body; The first main body and the pole together form a first groove, the first groove is communicated with the assembly hole, and the third sealing section is received in the first groove.
7. The single cell according to claim 6, characterized in that: The pole includes a second connecting portion and a second main body portion connected to each other, the second connecting portion is arranged on a side of the cover body away from the electrode assembly, the second main body portion is partially inserted into the assembly hole, and the first protrusion is protruding on a side of the second main body portion facing the connecting block.
8. The single cell according to claim 7, characterized in that: The first main body portion includes a first step and a second step arranged along the thickness direction, the first step is connected to the first connecting portion, the second step is connected to the first step and is located on a side of the first step away from the first connecting portion, and the first groove is located between the first step and the second main body portion.
9. The single cell according to claim 8, characterized in that: Along the length direction of the cover plate assembly, the minimum distance between the first sealing section and the outer edge of the first connecting portion is L mm, satisfying 0.5≤L≤1.0; Along the length direction of the cover plate assembly, there is a gap between the third sealing section and the second step, and the gap has a minimum size G mm, satisfying 0.05≤G≤0.
2.
10. A battery pack, characterized in that: The invention comprises a single cell according to any one of claims 1 to 9.