Single battery and battery pack
By designing a multi-connection and limiting pole structure in a single cell, the problem that the pole column cannot be processed in one go is solved, the connection tightness and production efficiency of the battery are improved, and the lightweight design and long-term stable operation of the battery are achieved.
Patent Information
- Application Number
- CN202510197763.8
- 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
The pole columns of existing single-unit batteries cannot be completed in one go and require secondary processing, resulting in high cost and low production efficiency.
A single cell including a cover plate assembly and an electrode assembly is designed, and the pole column cooperates with the cover plate assembly through the main body part, the first connecting part and the second connecting part to form multiple connections and limits, reducing complex assembly steps and additional fixing elements.
Through multiple connections and limits, the connection tightness between battery components is enhanced, stress caused by thermal expansion, cooling or vibration is resisted, long-term stability and production efficiency of the battery are improved, and lightweight design of the battery is realized.
Smart Images
Figure CN120127352A_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] The single cell comprises a shell, an electrode assembly and a cover assembly. The cover assembly is used to cover the shell, and the cover assembly carries a pole.
[0003] However, the poles in the cover plate assembly cannot be processed in one step and require secondary processing. Summary of the invention
[0004] Purpose of the invention: An embodiment of the present application provides a single cell battery, aiming to overcome the current technical problem that the pole cannot be processed in one go; another purpose of the embodiment of the present application is to provide a battery pack.
[0005] 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 in the thickness direction thereof;
[0006] The cover plate assembly comprises:
[0007] The cover plate body has an assembly hole;
[0008] The pole comprises a main body, a first connecting part and a second connecting part, wherein the main body is provided with the assembly hole, the first connecting part is connected to the side of the cover body away from the electrode assembly and surrounds the main body, the second connecting part surrounds the side of the main body facing the electrode assembly and forms a receiving groove together with the main body, and the second connecting part is provided with a rivet section protruding in a direction away from the receiving groove, and is used to form a limiting groove together with the main body;
[0009] A connecting block, connected to a side of the cover body away from the first connecting portion, partially embedded in the limiting groove, and connected to the second connecting portion;
[0010] The cover plate body is sandwiched between the first connecting portion and the connecting block.
[0011] In some embodiments, the electrode assembly includes a pole ear and an electrode body, the pole ear includes a first section and a second section that are connected, the first section is connected to the electrode body and partially extends into the accommodating groove, the second section is connected to an end of the first section away from the electrode body, and is connected to one side of the main body in the thickness direction.
[0012] In some embodiments, on a plane perpendicular to the thickness direction, the orthographic projection of the tab is located within the orthographic projection of the receiving groove, and a gap size G mm is provided between the first section and the second connecting portion, satisfying: 0.5≤G≤3.0.
[0013] In some embodiments, the connecting block includes a convex portion, the convex portion is convexly provided on a side of the connecting block facing the second connecting portion, the convex portion is embedded in the limiting groove, and abuts against the riveting section.
[0014] In some embodiments, the riveting section has a first step surface, and the first step surface is located on a side of the riveting section away from the accommodating groove;
[0015] The connecting block has a second step surface, and the second step surface is arranged opposite to the first step surface;
[0016] The cover plate assembly further includes a welding portion, and the welding portion connects the first step surface and the second step surface respectively.
[0017] In some embodiments, on a plane perpendicular to the thickness direction, the riveted section has a diameter width dimension W mm, satisfying: 0.15≤W≤0.75;
[0018] Along the thickness direction, the riveted section has a thickness dimension L, which satisfies: 0.35≤L≤0.6.
[0019] In some embodiments, the cover assembly also includes a seal, which includes a first sealing section, a second sealing section and a third sealing section. The first sealing section is inserted into the assembly hole and is located between the main body and the cover body. The second sealing section is clamped between the cover body and the connecting block. The third sealing section is embedded in the limiting groove and is clamped between the main body and the connecting block. The first sealing section connects the second sealing section and the third sealing section respectively.
[0020] In some embodiments, a sink groove is formed on one side of the cover body facing the connection block, and the sink groove is connected to the assembly hole and the limiting groove;
[0021] The sink has a first wall facing the connection block, and the main body has a second wall facing the connection block. The first wall and the second wall are on the same plane perpendicular to the thickness direction.
[0022] In some embodiments, the cover assembly further includes an upper plastic, wherein the upper plastic is disposed between the first connection portion and the cover body, and respectively connects the first connection portion and the cover body.
[0023] The embodiment of the present application further provides a battery pack, including the single battery as described in the above embodiment.
[0024] Beneficial effects: In the single battery of the embodiment of the present application, through the cooperation of the pole column, the connecting block and the cover plate body, multiple connections and limit positions are formed, effectively enhancing the connection tightness between components, and being able to better resist the stress effects caused by factors such as thermal expansion and contraction or vibration during the charging and discharging process of the battery, ensuring the long-term stable operation of the battery in a complex environment. At the same time, the pole column does not require secondary processing, reducing complex assembly steps and additional fixing elements, improving production efficiency, reducing production costs, and being conducive to large-scale production. Through the accommodating groove formed by the second connecting portion and the main body portion, the weight of the pole column is reduced, providing space for the assembly and accommodation of the tabs of the electrode assembly, improving the utilization rate of the internal space of the battery, and at the same time, realizing the lightweight design of the battery.
[0025] The battery pack of the embodiment of the present application includes the single battery as described 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. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0027] Figure 1 It is a schematic three-dimensional structure diagram of the single battery of the embodiment of the present application;
[0028] Figure 2 It is a schematic top view structure diagram of the single battery of the embodiment of the present application;
[0029] Figure 3 It is Figure 2 a schematic cross-sectional structure diagram along the A-A direction in
[0030] Figure 4 It is Figure 3 a partial enlarged schematic diagram at C in
[0031] Figure 5 It is Figure 2 a schematic cross-sectional structure diagram along the B-B direction in
[0032] Figure 6 It is Figure 5 a partial enlarged schematic diagram at D in
[0033] Figure 7 It is a schematic diagram of the single battery of the embodiment of the present application during the welding process of the tab and the pole column;
[0034] Figure 8 is Figure 7 A top view structural schematic diagram from a perspective;
[0035] Figure 9 is Figure 7 A sectional view structural schematic diagram along the E-E direction in;
[0036] Figure 10 is Figure 9 A partial enlarged schematic diagram at position F in;
[0037] Figure 11 A sectional view structural schematic diagram of the terminal post in the single cell of the embodiment of the present application;
[0038] Figure 12 A sectional view structural schematic diagram of the connection block in the single cell of the embodiment of the present application;
[0039] Explanation of reference numerals: 1. Cover plate assembly; 2. Electrode assembly; X. Thickness direction; 11. Cover plate body; 110. Assembly hole; 12. Terminal post; 121. Main body part; 122. First connection part; 123. Second connection part; 120. Accommodation groove; 124. Riveting section; 125. Limiting groove; 13. Connection block; 21. Electrode body; 22. Tab; 221. First section; 222. Second section; 131. Protrusion; 1241. First step surface; 1311. Second step surface; 14. Welding part; 15. Sealing member; 151. First sealing section; 152. Second sealing section; 153. Third sealing section; 111. Sunk groove; 1111. First wall; 1211. Second wall; 16. Upper plastic. Detailed implementation manners
[0040] 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 making creative efforts belong to the scope of protection of the present application.
[0041] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as a limitation on the present application. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically limited. The terms "first", "second", "third", etc. are only used to name the parts or embodiments with numbers for the convenience of description, and do not imply that there is an order of importance between the parts or embodiments.
[0042] It should also be noted that in the drawings of the present application, an arrow marked with X indicates a thickness direction X. In the description of the present application, the thickness direction X is introduced to more clearly define the structure and relative position relationship of each component in the single cell.
[0043] As a preface to the embodiments of the present application, the pole 12 in the cover assembly 1 of the current single cell cannot be processed in one step and requires secondary processing, which is costly; and the pole ear 22 and the pole 12 need to be connected with a connecting piece, which has a complex process, many parts, high cost, low yield, and insufficient product competitiveness.
[0044] 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.
[0045] See also Figures 1 to 12 As shown, the single battery in the embodiment of the present application includes: a cover assembly 1 and an electrode assembly 2, wherein the electrode assembly 2 is arranged on one side of the cover assembly 1 in the thickness direction X thereof; the cover assembly 1 includes a cover body 11, a pole 12 and a connecting block 13, wherein the cover body 11 has an assembly hole 110; the pole 12 includes a main body 121, a first connecting part 122 and a second connecting part 123, wherein the main body 121 is provided with the assembly hole 110, the first connecting part 122 is connected to the side of the cover body 11 away from the electrode assembly 2, and surrounds and connects the main body 121, and the second connecting part 123 23 is connected in a surrounding manner to a side of the main body 121 facing the electrode assembly 2, and together with the main body 121, a receiving groove 120 is formed; the second connecting portion 123 is provided with a rivet section 124 at one end away from the main body 121 and in a direction away from the receiving groove 120, and is used to form a limiting groove 125 together with the main body 121; the connecting block 13 is connected to a side of the cover body 11 away from the first connecting portion 122, and is partially embedded in the limiting groove 125 and connected to the second connecting portion 123; the cover body 11 is clamped between the first connecting portion 122 and the connecting block 13.
[0046] It should be understood that the terminal post 12 of the present application passes through the assembly hole 110 of the cover plate body 11 through the main body portion 121. The first connection portion 122 is on the side of the cover plate body 11 away from the electrode assembly 2, and the second connection portion 123 cooperates with the limiting block on the side of the cover plate body 11 facing the electrode assembly 2. Through the assembly connection relationship between the terminal post 12 and the connection block 13, the cover plate body 11 is firmly clamped between the first connection portion 122 and the connection block 13. This multiple connection and limiting method effectively enhances the connection tightness between components, can better resist the stress influence caused by factors such as thermal expansion and contraction or vibration during the charge and discharge process of the battery, and ensures the long-term stable operation of the battery in a complex environment.
[0047] The accommodation groove 120 formed by the second connection portion 123 and the main body portion 121 reduces the weight of the terminal post 12, provides space for the assembly and accommodation of the tab 22 of the electrode assembly 2, improves the utilization rate of the internal space of the battery. At the same time, it realizes the lightweight design of the battery. It should be understood that in the embodiment of the present application, along the thickness direction X, the thickness dimension of the accommodation groove 120 is greater than the thickness dimension of the second connection portion 123, that is, part of the accommodation groove 120 is opened on the side of the main body portion 121 facing the electrode assembly 2. By protruding a riveting section 124 from the end of the second connection portion 123 away from the main body portion 121 in the direction away from the accommodation groove 120, the riveting section 124 is used to connect and limit the connection block 13 to ensure that the connection block 13 and the first connection portion 122 can firmly clamp the cover plate body 11. The connection block 13 is partially embedded in the limiting groove 125, increasing the connection area and connection strength between the connection block 13 and the terminal post 12, effectively avoiding connection looseness caused by thermal expansion and contraction or mechanical vibration during the charge and discharge process of the battery, improving the reliability of the internal connection of the battery, and thus enhancing the overall performance and service life of the battery.
[0048] It should be understood that by riveting the riveting section 124 and the connection block 13, the contact area and mechanical strength of the connection are increased. A tight connection can be formed between the riveting section 124 and the connection block 13, and the stress is dispersed to prevent the connection part from loosening or falling off, ensuring the integrity of the internal structure of the battery, and further maintaining the stability of the battery performance. During the assembly process, the riveting section 124 can provide a clear positioning and guiding function for the connection block 13 to reduce the assembly difficulty and improve the assembly efficiency.
[0049] It should also be understood that during the processing of the terminal post 12 of the present application, it can be processed in one go without complex secondary processing techniques, greatly improving production efficiency and reducing processing costs. The structural design of the terminal post 12 enables the assembly of each component to be relatively convenient. The main body portion 121 of the terminal post 12 passes through the assembly hole 110, and the connecting block 13 is directly embedded in the limiting groove 125, thereby realizing the stable connection between the terminal post 12 and the cover plate body 11, reducing complex assembly steps and additional fixing elements, improving production efficiency, reducing production costs, and being conducive to large-scale production.
[0050] Please refer to Figures 3 to 6 As shown, in some embodiments, the electrode assembly 2 includes a tab 22 and an electrode body. The tab 22 includes a first section 221 and a second section 222 connected to each other. The first section 221 is connected to the electrode body and partially extends into the receiving groove 120. The second section 222 is connected to one end of the first section 221 away from the electrode body and is connected to one side of the main body portion 121 in the thickness direction X. It should be understood that by providing the receiving groove 120 on the terminal post 12, the first section 221 of the tab 22 is connected to the electrode body and partially received in the receiving groove 120, playing a role of receiving and protecting, so that the tab 22 is not easily interfered by external factors, and the connection stability between the tab 22 and the terminal post 12 is improved. The second section 222 of the tab 22 is connected to one side of the main body portion 121 along the thickness direction X, establishing a firm connection between the tab 22 and the terminal post 12, ensuring the reliability of the internal circuit connection of the battery and reducing the risk of failure caused by loose connection. The two-section structure of the tab 22 reduces the number of bends of the tab 22, can effectively shorten the current transmission path, reduce resistance, reduce energy loss, thereby improving the charge and discharge efficiency of the battery and enhancing the overall performance of the battery.
[0051] Please refer to Figures 7 to 10 As shown, in some embodiments, the tab 22 is connected to the terminal post 12 by penetration welding. During the process of combining the multiple electrode assemblies 2 of the single cell, using the space between the two electrode assemblies 2, the tab 22 is welded to one side of the main body portion 121 in the thickness direction X, and the tab 22 is bent into a two-section structure. Its structure is simple, without complex assembly techniques and fixing methods, reducing the assembly difficulty and cost, and improving production efficiency.
[0052] Please refer to Figure 6As shown, in some embodiments, on a plane perpendicular to the plane where the thickness direction X is located, the orthographic projection of the tab 22 is located within the orthographic projection of the receiving groove 120, and there is a gap dimension G mm between the first section 221 and the second connecting portion 123, satisfying: 0.5 ≤ G ≤ 3.0. It should be understood that the first section 221 of the tab 22 is connected to the electrode body, and the orthographic projection of the tab 22 along the thickness direction X is located within the receiving groove 120, so that the connection position of the tab 22 and the electrode body is located within the projection of the receiving groove 120 in the thickness direction X, ensuring that the assembly position of the tab 22 is more accurately controllable, avoiding unnecessary interference between the tab 22 and other components, making the internal space layout of the battery more regular and orderly, and further ensuring the connection stability between the tab 22, the electrode body, and the pole post 12, thereby ensuring stable current transmission. By controlling the distance between the first section 221 and the second connecting portion 123 within the range of 0.5 mm to 3.0 mm, space is reserved for the bending of the tab 22, avoiding interference between the bent tab 22 and the second connecting portion 123 during the assembly process and causing damage to the tab 22. At the same time, reasonable space is reserved for the thermal expansion and contraction of the tab 22 during the charge and discharge process of the battery, and local overheating caused by too small a gap can also be avoided, further optimizing the stability of current conduction.
[0053] Please refer to Figures 3 to 6 As shown, in some embodiments, the connecting block 13 includes a convex portion 131, which protrudes from the side of the connecting block 13 facing the second connecting portion 123. The convex portion 131 is embedded in the limiting groove 125 and abuts against the riveting section 124. It should be understood that by setting the convex portion 131 of the connecting block 13 to be embedded in the limiting groove 125 and abut against the riveting section 124, on the one hand, the displacement of the connecting block 13 in the plane direction is restricted, and on the other hand, the external force in the vertical direction is resisted to a certain extent. When the battery is subjected to severe vibration and impact, the abutting connecting block 13 and the second connecting portion 123 can effectively prevent the connecting block 13 from falling out of the limiting groove 125, enhancing the stability of the overall structure.
[0054] It is also necessary to understand that by abutting the connecting block 13 with the riveted section 124, stress transfer dispersion is achieved, fatigue damage to the connection parts caused by excessive local stress is effectively avoided, the structural integrity and performance stability of the battery under complex working conditions are guaranteed, and the service life of the battery is extended. The cooperation between the convex portion 131 and the riveted section 124 makes it easier to align and fix the connecting block 13 during installation. The initial positioning of the connecting block 13 can be completed by simply snapping the convex portion 131 of the connecting block 13 on the riveted section 124, which greatly reduces the difficulty of assembly. At the same time, this precise positioning method effectively reduces quality problems caused by assembly errors and improves the qualified rate of the product. The close abutment between the convex portion 131 and the riveted section 124 ensures stable contact between the connecting block 13 and the pole 12. During the battery charging and discharging process, stable contact can effectively reduce contact resistance, reduce energy loss and heat generation, and significantly improve the charging and discharging efficiency and performance stability of the battery.
[0055] See also Figures 3 to 6 Also refer to Figure 11 and Figure 12 As shown, in some embodiments, the riveting section 124 has a first step surface 1241, and the first step surface 1241 is located on the side of the riveting section 124 away from the accommodating groove 120; the connecting block 13 has a second step surface 1311, and the second step surface 1311 is arranged opposite to the first step surface 1241; the cover plate assembly 1 also includes a welding portion 14, and the welding portion 14 connects the first step surface 1241 and the second step surface 1311 respectively. By the relative arrangement of the first step surface 1241 and the second step surface 1311, the convex portion 131 and the riveting section 124 that are in contact with each other, the connecting block 13 and the second connecting portion 123 form a more complex and stable connection structure, which increases the friction and mechanical bite force between the connecting block 13 and the riveting section 124. When subjected to complex external forces, it can more effectively disperse and resist stress, further improving the stability of the battery structure.
[0056] Specifically, the first step surface 1241 is connected to the second step surface 1311 by the welding portion 14, and the welding portion 14 can withstand large tensile and shear forces to prevent the connection block 13 and the riveted section 124 from separating or loosening during long-term use. At the same time, the welding portion 14 can fill the gap between the first step surface 1241 and the second step surface 1311, improve the sealing performance, avoid contact between the electrolyte and the external environment, ensure the safety of the battery, and increase the service life. The first step surface 1241 and the second step surface 1311 are connected by the welding portion 14, eliminating the air gap or impurities that may exist in the connection part, so that the current can pass through the connection block 13 and the riveted section 124 more smoothly, reducing the contact resistance, reducing the energy loss and heat generation during the charging and discharging process, and increasing the reliability of the electrical connection. During the long-term use of the battery, stable current transmission performance can be maintained.
[0057] Please refer to Figure 4 As shown, in some embodiments, on a plane perpendicular to the thickness direction X, the riveting section 124 has a radial width dimension W mm, satisfying: 0.15 ≤ W ≤ 0.75; along the thickness direction X, the riveting section 124 has a thickness dimension L, satisfying: 0.35 ≤ L ≤ 0.6. It should be understood that by limiting the radial width of the riveting section 124 to be between 0.15 mm and 0.75 mm, it is ensured that the enclosed limiting groove 125 has sufficient space for part of the connecting block 13 to be embedded, guaranteeing the connection stability between the riveting section 124 and the connecting block 13, making the fixing structure of the cover plate assembly 1 more firm and the structural layout more reasonable. By limiting the thickness dimension of the riveting section 124 to be between 0.35 mm and 0.6 mm, the connection reliability between it and the connecting block 13 is ensured, avoiding insufficient connection strength between the connecting block 13 and the second connecting portion 123, and making it easy for the connecting block 13 and the second connecting portion 123 to become loose when subjected to external force impact. At the same time, it is avoided that the size of the riveting section 124 is too large, resulting in a tight assembly space and affecting the layout of other components inside the battery.
[0058] Specifically, W can be any value among 0.15 mm, 0.25 mm, 0.35 mm, 0.45 mm, 0.55 mm, 0.65 mm, 0.75 mm or a range value between two values. Within the above range, when W is larger, the space of the limiting groove 125 is larger, the size of the convex portion 131 embedded in the limiting groove 125 is larger, the assembly structure of the connecting block 13 and the pole 12 is more firm, and the seismic resistance ability is better. When W is smaller, the force transmission path between the riveting section 124 and the convex portion 131 is shorter, the structural strength is higher, the connection position between the convex portion 131 and the riveting section 124 is not easily deformed by force, and it is not easy for the connecting block 13 and the second connecting portion 123 to become loose.
[0059] Specifically, L can be any value among 0.35 mm, 0.45 mm, 0.55 mm, 0.6 mm or a range value between two values. Within the above range, when L is larger, the riveting section 124 is thicker, the structural strength is higher, the anti-bending deformation ability is higher, the assembly structure of the connecting block 13 and the pole 12 is more firm, and the seismic resistance ability is better. When L is smaller, the space occupied by the riveting section 124 along the thickness direction X is smaller, and the structural layout is more reasonable.
[0060] Please refer to Figure 6As shown, in some embodiments, the cover plate assembly 1 further includes a seal 15. The seal 15 includes a first seal section 151, a second seal section 152, and a third seal section 153. The first seal section 151 is inserted through the assembly hole 110 and is located between the main body portion 121 and the cover plate body 11. The second seal section 152 is clamped between the cover plate body 11 and the connecting block 13. The third seal section 153 is embedded in the limiting groove 125 and is clamped between the main body portion 121 and the connecting block 13. The first seal section 151 connects the second seal section 152 and the third seal section 153 respectively. It should be understood that the first seal section 151 is arranged between the main body portion 121 and the cover plate body 11, effectively filling the gap between the two, enhancing the tightness of the connection between the main body portion 121 and the cover plate body 11, and at the same time forming an insulating protection between the main body portion 121 and the cover plate body 11. The second seal section 152 is clamped between the cover plate body 11 and the connecting block 13. On the one hand, it forms an insulating protection between the cover plate body 11 and the connecting block 13. On the other hand, the second seal section 152 can play a buffering role between the connecting block 13 and the cover plate body 11, avoiding damage to the connection part due to stress concentration. The third seal section 153 is embedded in the limiting groove 125 and is clamped between the main body portion 121 and the connecting block 13, restricting the relative movement of the main body portion 121 and the connecting block 13 in the limiting groove 125, ensuring that the entire connection structure can remain stable under various working conditions, thereby improving the overall structural stability of the battery. The three-section seal sections act on the gaps between the main body portion 121 and the cover plate body 11, the cover plate body 11 and the connecting block 13, and the main body portion 121 and the connecting block 13 respectively, forming multiple sealing lines of defense, greatly reducing the risk of electrolyte leakage. In terms of electrical connection, the stable sealing structure avoids electrical faults such as short circuits caused by electrolyte leakage, ensures the stable transmission of current between components such as the pole 12 and the connecting block 13, improves the electrical connection reliability during the charging and discharging process of the battery, and ensures the efficient and stable operation of the battery.
[0061] Please refer to Figure 4As shown, in some embodiments, a sunken groove 111 is formed on one side of the cover plate body 11 facing the connection block 13. The sunken groove 111 communicates with the assembly hole 110 and the limiting groove 125. The sunken groove 111 has a first wall 1111 facing the connection block 13, and the main body portion 121 has a second wall 1211 facing the connection block 13. The first wall 1111 and the second wall 1211 are on the same plane perpendicular to the thickness direction X. It should be understood that by forming the sunken groove 111 on the cover plate body 11, it is used to accommodate the second sealing section 152, so as to reduce the space required for the assembly of the seal 15 and improve the space utilization rate. By setting the second wall 1211 of the main body portion 121 and the first wall 1111 of the sunken groove 111 on the same plane, it is ensured that the compression amounts of the second sealing section 152 and the third sealing section 153 are consistent, improving the assembly efficiency of the cover plate assembly 1 and ensuring the connection stability between the cover plate body 11, the connection block 13 and the terminal post 12. The forces on each component are evenly distributed, reducing the risk of structural damage caused by excessive local stress.
[0062] Please refer to Figure 4 and Figure 6 As shown, in some embodiments, the cover plate assembly 1 further includes an upper plastic 16. The upper plastic 16 is disposed between the first connection portion 122 and the cover plate body 11 and is respectively connected to the first connection portion 122 and the cover plate body 11. It should be understood that the upper plastic 16, as an insulating material, can effectively isolate the first connection portion 122 and the cover plate body 11, prevent short circuits between components with different potentials, and improve the safety and reliability of the battery. In addition, the upper plastic 16 can also prevent external moisture, dust and other impurities from entering the battery interior, play a protective role for key components inside the battery, extend the service life of the battery, and ensure the stable operation of the battery in various complex environments. During the use of the battery, it may be subjected to external forces such as vibration and impact. The upper plastic 16 has a certain elasticity and can play a role in buffering and shock absorption between the first connection portion 122 and the cover plate body 11, reducing the risk of component damage caused by external forces, protecting the integrity of the internal structure of the battery, and further improving the stability and reliability of the battery in different usage scenarios.
[0063] The embodiment of the present application also discloses a battery pack, including the single battery as described 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.
[0064] In the above embodiments, the descriptions of each embodiment have their own emphases. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0065] The above has introduced in detail the single cell and battery pack provided by the embodiments of the present application, and specific examples have been used to elaborate on 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 cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A single cell battery, characterized in that: include: A cover plate assembly and an electrode assembly, wherein the electrode assembly is disposed on one side of the cover plate assembly in a thickness direction thereof; The cover plate assembly comprises: The cover plate body has an assembly hole; The pole comprises a main body, a first connecting part and a second connecting part, wherein the main body is provided with the assembly hole, the first connecting part is connected to the side of the cover body away from the electrode assembly and surrounds the main body, the second connecting part surrounds the side of the main body facing the electrode assembly and forms a receiving groove together with the main body, and the second connecting part is provided with a rivet section protruding in a direction away from the receiving groove, and is used to form a limiting groove together with the main body; A connecting block, connected to a side of the cover body away from the first connecting portion, partially embedded in the limiting groove, and connected to the second connecting portion; The cover plate body is sandwiched between the first connecting portion and the connecting block.
2. The single cell according to claim 1, characterized in that: The electrode assembly includes a pole ear and an electrode body, the pole ear includes a first section and a second section that are connected, the first section is connected to the electrode body and partially extends into the accommodating groove, the second section is connected to an end of the first section away from the electrode body, and is connected to one side of the main body in the thickness direction.
3. The single cell according to claim 2, characterized in that: On a plane perpendicular to the thickness direction, the orthographic projection of the tab is located within the orthographic projection of the receiving groove, and a gap size G mm is provided between the first section and the second connecting portion, satisfying: 0.5≤G≤3.
0.
4. The single cell according to claim 1, characterized in that: The connecting block comprises a convex portion, the convex portion is convexly arranged on a side of the connecting block facing the second connecting portion, the convex portion is embedded in the limiting groove, and abuts against the riveting section.
5. The single cell according to claim 4, characterized in that: The riveting section has a first step surface, and the first step surface is located on a side of the riveting section away from the accommodating groove; The connecting block has a second step surface, and the second step surface is arranged opposite to the first step surface; The cover plate assembly further includes a welding portion, and the welding portion connects the first step surface and the second step surface respectively.
6. The single cell according to claim 1, characterized in that: On a plane perpendicular to the thickness direction, the riveted section has a diameter width dimension W mm, satisfying: 0.15≤W≤0.75; Along the thickness direction, the riveted section has a thickness dimension L, which satisfies: 0.35≤L≤0.
6.
7. The single cell according to claim 1, characterized in that: The cover assembly also includes a seal, which includes a first sealing segment, a second sealing segment and a third sealing segment. The first sealing segment is inserted into the assembly hole and is located between the main body and the cover body. The second sealing segment is clamped between the cover body and the connecting block. The third sealing segment is embedded in the limiting groove and is clamped between the main body and the connecting block. The first sealing segment connects the second sealing segment and the third sealing segment respectively.
8. The single cell according to claim 1, characterized in that: A sink groove is formed on one side of the cover plate body facing the connecting block, and the sink groove is communicated with the assembly hole and the limiting groove; The sink has a first wall facing the connection block, and the main body has a second wall facing the connection block. The first wall and the second wall are on the same plane perpendicular to the thickness direction.
9. The single cell according to claim 1, characterized in that: The cover assembly further includes an upper plastic, which is disposed between the first connection portion and the cover body and respectively connects the first connection portion and the cover body.
10. A battery pack, characterized in that: The invention comprises a single cell according to any one of claims 1 to 9.