Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, and belongs to the technical field of batteries. Each single battery comprises a cover plate assembly and an electrode assembly; each cover plate assembly comprises a cover plate body, a pole and a connecting block; an assembly hole is formed in the cover plate body; the pole comprises a first connecting part, a main body part and a second connecting part, the main body part penetrates through the assembly hole, the first connecting part is arranged on the side, away from the electrode assembly, of the cover plate body and connected with the main body part in a surrounding mode, the second connecting part is arranged on the side, facing the electrode assembly, of the main body part, and a limiting groove is defined by the second connecting part and the main body part; the connecting block is arranged on the side, away from the first connecting part, of the cover plate body and is partially embedded in the limiting groove, and the cover plate body is clamped between the first connecting part and the connecting block; on a plane perpendicular to the thickness direction, orthographic projections of the second connecting part and the connecting block have an overlapping area, and the radial width size W of the overlapping area is larger than or equal to 0.15 and smaller than or equal to 1. And the pole is high in assembly firmness and stability, and is not easy to fail and fall off.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a single cell battery and a battery pack. Background Technology

[0002] A single cell includes a casing, an electrode assembly, and a cover assembly. The cover assembly is used to seal the casing and supports the terminal posts.

[0003] However, the assembly formed between the pole and the cover plate body in the cover plate assembly is prone to failure. Utility Model Content

[0004] The purpose of this utility model is to provide a single-cell battery to overcome the technical problem that the terminal assembly in current single-cell batteries is prone to failure; another purpose of this application is to provide a battery pack.

[0005] Technical solution: The single cell provided in this application includes: a cover plate assembly and an electrode assembly, wherein the electrode assembly is disposed on one side of the cover plate assembly in its thickness direction;

[0006] The cover plate assembly includes:

[0007] The cover plate body has assembly holes along the thickness direction;

[0008] The electrode post includes a first connecting part, a main body part, and a second connecting part. The main body part passes through the assembly hole. The first connecting part is located on the side of the cover plate body away from the electrode assembly and surrounds the main body part. The second connecting part is located on the side of the main body part facing the electrode assembly. The second connecting part and the main body part form a limiting groove.

[0009] A connecting block is disposed on the side of the cover plate body away from the first connecting part, and is partially embedded in the limiting groove. The cover plate body is sandwiched between the first connecting part and the connecting block.

[0010] On a plane perpendicular to the thickness direction, the second connecting part and the orthographic projection of the connecting block have an overlapping area, and the radial width of the overlapping area is W, which satisfies: 0.15≤W≤1.

[0011] In some embodiments, the second connecting portion is arranged circumferentially and together with the main body portion forms an accommodating groove;

[0012] The limiting groove is arranged around the outside of the receiving groove.

[0013] In some embodiments, the second connecting portion includes a base segment and a riveting segment, the base segment being connected to the main body portion, and the riveting segment being connected to the end of the base segment away from the main body portion and protruding in a direction away from the receiving groove;

[0014] The connecting block includes a protrusion that is embedded in the limiting groove and abuts against the riveting section in the thickness direction.

[0015] In some embodiments, the riveting segment has a first stepped surface located on the side of the riveting segment opposite to the receiving groove;

[0016] The protrusion has a second stepped surface, which is disposed opposite to the first stepped surface.

[0017] The cover plate assembly also includes a welding part, which connects the first step surface and the second step surface respectively.

[0018] In some embodiments, the base segment has a diameter-width dimension W1 mm ​​on a plane perpendicular to the thickness direction, satisfying: 1.0 ≤ W1 ≤ 1.5;

[0019] Along the thickness direction, the riveted section has a thickness dimension L mm, satisfying: 0.35≤L≤0.6;

[0020] And / or, along the thickness direction, the connecting block has a thickness dimension L1 mm, and the protrusion has a thickness dimension L2 mm, satisfying: 0.65≤L1≤1.5, 0.2≤L2≤0.8.

[0021] In some embodiments, along the thickness direction, the main body has a thickness dimension L3 mm, the first connecting part has a thickness dimension L4 mm, and the second connecting part has a thickness dimension L5 mm, satisfying: 2.0≤L3≤3.0, 1.5≤L4≤2, 1.1≤L5≤2.1.

[0022] In some embodiments, the cover plate assembly further includes a sealing element, the sealing element including a first sealing section, a second sealing section and a third sealing section, the first sealing section being disposed between the main body and the cover plate body, the second sealing section being sandwiched between the cover plate body and the connecting block, and the third sealing section being embedded in the limiting groove and sandwiched between the main body and the connecting block, the first sealing section connecting the second sealing section and the third sealing section respectively.

[0023] In some embodiments, the electrode assembly further includes an electrode body and a tab, the tab including a first segment and a second segment connected together, the first segment being connected to the electrode body and extending partially into the receiving groove, the second segment being connected to the end of the first segment away from the electrode body and connected to one side of the body portion in the thickness direction.

[0024] In some embodiments, a recessed groove is provided on the side of the cover plate body facing the connecting block, and the recessed groove communicates with the assembly hole and the limiting groove;

[0025] The sink has a first wall facing the connecting block, and the limiting groove has a second wall facing the connecting block. The first wall and the second wall are on the same plane perpendicular to the thickness direction.

[0026] This application also discloses a battery pack, including the single battery cells as described in the above embodiments.

[0027] Beneficial effects: In the single battery of this application embodiment, the electrode post passes through the assembly hole of the cover plate body through the main body. The first connecting part is on the side of the cover plate body away from the electrode assembly, and the second connecting part cooperates with the limiting block on the side of the cover plate body facing the electrode assembly. The connecting block is partially embedded in the limiting groove formed by the second connecting part and the main body to form an assembly relationship. The cover plate body is then clamped by the first connecting part and the connecting block to form a stable assembly structure, which effectively enhances the tightness of the connection between the components. By limiting the second connecting part and the connecting block to a plane perpendicular to the thickness direction, the orthographic projections of the second connecting part and the connecting block have an overlapping area, and the radial width of the overlapping area is between 0.15mm and 1.0mm, so as to precisely control the assembly accuracy between the electrode post and the connecting block, and ensure the connection strength and sealing reliability of the second connecting part and the connecting block.

[0028] The battery pack of this application embodiment includes the single battery cell as described in the above embodiments. Therefore, it can have all the technical features and effects of the single battery cell described above, which will not be repeated here. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a three-dimensional structural diagram of a single battery cell according to an embodiment of this application;

[0031] Figure 2This is a top view of the structure of a single battery cell according to an embodiment of this application;

[0032] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0033] Figure 4 for Figure 3 A magnified view of a portion of point D in the middle;

[0034] Figure 5 for Figure 2 A cross-sectional view along the BB direction;

[0035] Figure 6 for Figure 5 A magnified view of a portion of point C in the middle;

[0036] Figure 7 This is a schematic diagram of a half-section of the electrode post in a single cell of an embodiment of this application;

[0037] Figure 8 This is a half-sectional view of the connecting block in a single battery cell according to an embodiment of this application;

[0038] Explanation of reference numerals in the attached drawings: 1. Cover plate assembly; 2. Electrode assembly; X, thickness direction; 11. Cover plate body; 110. Assembly hole; 12. Electrode post; 121. Main body; 122. First connecting part; 123. Second connecting part; 124. Limiting groove; 13. Connecting block; 120. Receiving groove; 1231. Base section; 1232. Riveting section; 131. Protrusion; 1230. First step surface; 1310. Second step surface; 14. Welding part; 15. Sealing element; 151. First sealing section; 152. Second sealing section; 153. Third sealing section; 21. Electrode body; 22. Electrode lug; 221. First section; 222. Second section; 111. Sink; 1111. First wall; 1211. Second wall. Detailed Implementation

[0039] 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 them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0040] In the description of this application, it should be understood that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, "multiple" means two or more, and "at least one" can refer to one, two, or more, unless otherwise explicitly specified. The terms "first," "second," and "third," etc., are only for the convenience of description and are used to name parts or embodiments by number, and do not imply any order of importance between the parts or embodiments.

[0041] It should also be noted that in the accompanying drawings of this application, the arrow marked X is used to indicate the thickness direction X. In the description of this application, the thickness direction X is introduced to more clearly define the structure and relative positional relationship of each component in a single cell.

[0042] As a preamble to the embodiments of this application, the cover assembly 1 in the battery mainly consists of a terminal post 12, a cover body 11, and a sealing ring. However, currently, the structures of the various parts in the cover assembly 1 are complex, and the terminal post 12 cannot be machined in one step, requiring secondary processing, resulting in high processing costs. At the same time, the terminal post 12 is relatively heavy, which increases the weight after the battery is assembled, reducing its competitiveness.

[0043] In view of this, embodiments of this application provide a single-cell battery, which aims to solve at least one of the above-mentioned technical problems.

[0044] Please see Figures 1 to 8 As shown in the figure, this application discloses a single-cell battery, including: a cover plate assembly 1 and an electrode assembly 2, wherein the electrode assembly 2 is disposed on one side of the cover plate assembly 1 in the thickness direction X; the cover plate assembly 1 includes: a cover plate body 11, an electrode post 12, and a connecting block 13; the cover plate body 11 has an assembly hole 110 along the thickness direction X; the electrode post 12 includes a first connecting portion 122, a main body portion 121, and a second connecting portion 123, wherein the main body portion 121 passes through the assembly hole 110, and the first connecting portion 122 is disposed on the side of the cover plate body 11 opposite to the electrode assembly 2, and Surrounding the main body 121, the second connecting part 123 is disposed on the side of the main body 121 facing the electrode assembly 2, and the second connecting part 123 and the main body 121 form a limiting groove 124; the connecting block 13 is disposed on the side of the cover plate body 11 away from the first connecting part 122, and is partially embedded in the limiting groove 124, and the cover plate body 11 is sandwiched between the first connecting part 122 and the connecting block 13; on the plane perpendicular to the thickness direction X, the orthographic projections of the second connecting part 123 and the connecting block 13 have an overlapping area, and the radial width dimension of the overlapping area is W mm, which satisfies: 0.15≤W≤1.

[0045] It should be understood that the electrode post 12 of this application passes through the mounting hole 110 of the cover plate body 11 through the main body 121. The first connecting part 122 is on the side of the cover plate body 11 away from the electrode assembly 2. The second connecting part 123 cooperates with the limiting block on the side of the cover plate body 11 facing the electrode assembly 2. The connecting block 13 is partially embedded in the limiting groove 124 formed by the second connecting part 123 and the main body 121 to form an assembly relationship. The cover plate body 11 is clamped by the first connecting part 122 and the connecting block 13 to form a stable assembly structure. This multi-connection and limiting method effectively enhances the tightness of the connection between the components, can better resist the stress caused by thermal expansion and contraction or vibration during the charging and discharging process of the battery, effectively avoids the loosening and displacement between the electrode post 12 and the cover plate body 11, and ensures the long-term stable operation of the battery in complex environments.

[0046] Please see Figure 4 As shown, by defining a plane perpendicular to the thickness direction X, the orthographic projections of the second connecting portion 123 and the connecting block 13 overlap, and the radial width of the overlapping area is between 0.15 mm and 1.0 mm. This dimensional range allows for precise control of the assembly accuracy between the electrode post 12 and the connecting block 13, ensuring reliable connection between the second connecting portion 123 and the connecting block 13, and preventing insufficient connection strength between the connecting block 13 and the second connecting portion 123, which could lead to deformation and failure of the second connecting portion 123 under external impact. Simultaneously, it ensures effective connection between the electrode post 12 and the connecting block 13 while maintaining good sealing at the connection point, preventing leakage of electrolytes and other substances.

[0047] Specifically, W can be any value from 0.15mm, 0.25mm, 0.35mm, 0.45mm, 0.55mm, 0.65mm, 0.75mm, 0.85mm, 0.95mm, and 1.0mm, or a range between two values. Within the above range, the larger W is, the longer the sealing path between the second connecting part 123 and the connecting block 13, resulting in better sealing. Simultaneously, the limiting and locking area between the second connecting part 123 and the connecting block 13 is larger, ensuring more uniform stress distribution, more stable connection, and a more robust structure. Conversely, the smaller W is, the shorter the force transmission path between the second connecting part 123 and the connecting block 13, resulting in higher structural strength, and the connection position between the second connecting part 123 and the connecting block 13 is less prone to deformation under stress.

[0048] It is also important to understand that the pole post 12 of this application is formed by one-time stamping, eliminating the need for complex secondary processing, which greatly improves production efficiency and reduces processing costs. The structural design of the pole post 12 makes the assembly of various components more convenient. The main body 121 of the pole post 12 has an assembly hole 110, and the connecting block 13 is directly embedded with a limiting groove 124, which can achieve a stable connection between the pole post 12 and the cover plate body 11, reducing complex assembly steps and additional fixing components, improving production efficiency, reducing production costs, and facilitating large-scale production.

[0049] Please see Figures 5 to 7 As shown, in some embodiments, the second connecting portion 123 is arranged circumferentially and together with the main body portion 121 forms a receiving groove 120. It should be understood that the receiving groove 120 of this application is located on the side of the second connecting portion 123 opposite to the limiting groove 124. The receiving groove 120 formed by the second connecting portion 123 and the main body portion 121 reduces the weight of the electrode post 12 and provides space for the assembly and storage of the electrode tab 22 of the electrode assembly 2, thereby improving the utilization rate of the internal space of the battery and realizing the lightweight design of the battery.

[0050] Please see Figure 4 As shown, in some embodiments, the second connecting portion 123 includes a base segment 1231 and a riveting segment 1232. The base segment 1231 is connected to the main body portion 121, and the riveting segment 1232 is connected to the end of the base segment 1231 away from the main body portion 121 and protrudes in a direction away from the receiving groove 120. The connecting block 13 includes a protrusion 131, which is embedded in the limiting groove 124. In the thickness direction X, the protrusion 131 abuts against the riveting segment 1232. It is important to understand that by extending the riveting section 1232 for riveting and assembling with the protrusion 131, the first connecting part 122 and the connecting block 13, while clamping the cover plate body 11, abut against the protrusion 131 and the riveting section 1232. This increases the contact area and mechanical strength of the connection, allowing a tight connection to be formed between the riveting section 1232 and the connecting block 13, dispersing stress, preventing loosening or detachment of the connection, ensuring the integrity of the battery's internal structure, and thus maintaining stable battery performance. During assembly, the riveting section 1232 provides clear positioning and guidance for the connecting block 13, reducing assembly difficulty and improving assembly efficiency.

[0051] The structural design of the pole post 12 in this application makes the assembly of each component more convenient. The main body 121 of the pole post 12 has an assembly hole 110, and the connecting block 13 is directly embedded with a limiting groove 124, which can realize a stable connection between the pole post 12 and the cover plate body 11. This reduces complex assembly steps and additional fixing components, improves production efficiency, reduces production costs, and is conducive to large-scale production.

[0052] Please see Figures 6 to 8As shown, in some embodiments, the riveting section 1232 has a first stepped surface 1230, which is located on the side of the riveting section 1232 away from the receiving groove 120; the protrusion 131 has a second stepped surface 1310, which is disposed opposite to the first stepped surface 1230; the cover plate assembly 1 also includes a welding part 14, which connects the first stepped surface 1230 and the second stepped surface 1310 respectively. By having the first stepped surface 1230 and the second stepped surface 1310 disposed opposite to each other, and the protrusion 131 and the riveting section 1232 engaging, a more complex and stable connection structure is formed between the connecting block 13 and the second connecting part 123, increasing the friction and mechanical engagement force between the connecting block 13 and the riveting section 1232. Under complex external forces, stress can be more effectively dispersed and resisted, further improving the stability of the battery structure.

[0053] Specifically, the first stepped surface 1230 and the second stepped surface 1310 are connected by a welding part 14. The welding part 14 can withstand greater tensile and shear forces, preventing the connecting block 13 and the riveting section 1232 from separating or loosening during long-term use. Simultaneously, the welding part 14 fills the gap between the first stepped surface 1230 and the second stepped surface 1310, improving sealing performance, preventing electrolyte contact with the external environment, ensuring battery safety, and extending battery life. Connecting the first stepped surface 1230 and the second stepped surface 1310 by the welding part 14 eliminates potential air gaps or impurities at the connection point, allowing current to flow more smoothly between the connecting block 13 and the riveting section 1232. This reduces contact resistance, minimizes energy loss and heat generation during charging and discharging, increases electrical connection reliability, and maintains stable current transmission performance during long-term battery use.

[0054] Please see Figure 4As shown, in some embodiments, on a plane perpendicular to the thickness direction X, the base segment 1231 has a radial width dimension W1 mm, satisfying: 1.0 ≤ W1 ≤ 1.5; along the thickness direction X, the riveting segment 1232 has a thickness dimension L mm, satisfying: 0.35 ≤ L ≤ 0.6. It should be understood that by limiting the radial width of the base segment 1231 to between 1.0 mm and 1.5 mm, the structural strength of the second connecting portion 123 is ensured, reducing the risk of deformation during the assembly of the electrode post 12 and during battery operation. Specifically, W1 can be any value among 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, and 1.5 mm, or a range between two values. The larger W1 is, the higher the structural strength of the second connecting portion 123, and the higher the connection stability between the second connecting portion 123 and the main body portion 121. The smaller W1 is, the larger the space of the limiting groove 124 formed by the second connecting part 123 is, providing more embedding space for the connecting block 13 to lock the second connecting part 123 and the connecting block 13, thereby improving the connection stability.

[0055] By limiting the thickness of the riveting section 1232 to between 0.35mm and 0.6mm, the structural strength of the riveting section 1232 is ensured, and a reliable connection is formed between the riveting section 1232 and the protrusion 131 of the connecting block 13. Specifically, L can be any value among 0.35mm, 0.45mm, 0.55mm, and 0.6mm, or a range between two values. Within the above range, the larger L is, the higher the structural strength of the riveting section 1232, and the higher the reliability of the assembly connection between the terminal post 12 and the cover plate body 11; the smaller L is, the less internal space is occupied in the battery, improving space utilization.

[0056] Please see Figure 4 As shown, in some embodiments, along the thickness direction X, the connecting block 13 has a thickness dimension L1 mm, and the protrusion 131 has a thickness dimension L2 mm, satisfying: 0.65≤L1≤1.5, 0.2≤L2≤0.8. It should be understood that by limiting the thickness dimension of the connecting block 13 to between 0.65mm and 1.5mm, sufficient structural strength is ensured for the connecting block 13 to stably clamp the cover plate body 11. Specifically, L1 can be any value or a range between two values ​​from 0.65mm, 0.75mm, 0.85mm, 0.95mm, 1.05mm, 1.15mm, 1.25mm, 1.35mm, 1.45mm, and 1.5mm. Within the above range, the larger L1 is, the higher the structural strength of the connecting block 13 and the higher the connection stability. The smaller L1 is, the less internal space is occupied by the battery, improving space utilization.

[0057] By limiting the thickness of the protrusion 131 to between 0.2mm and 0.8mm, the structural strength of the protrusion 131 is ensured, and the protrusion 131 forms a stable fit with the riveting section 1232, ensuring stability after assembly. Specifically, L2 can be any value among 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, and 0.8mm, or a range between two values. Within the above range, the larger L2 is, the higher the structural strength of the protrusion 131, and the higher the reliability of the assembly connection between the pole post 12 and the cover plate body 11; the smaller L2 is, the easier it is for the protrusion 131 of the connecting block 13 to be embedded in the limiting groove 124 and cooperate with the riveting section 1232, improving assembly efficiency.

[0058] Please see Figure 7 As shown, in some embodiments, along the thickness direction X, the main body 121 has a thickness dimension L3 mm, the first connecting part 122 has a thickness dimension L4 mm, and the second connecting part 123 has a thickness dimension L5 mm, satisfying: 2.0≤L3≤3.0, 1.5≤L4≤2, 1.1≤L5≤2.1. It should be understood that the thickness dimension of the main body 121 along the thickness direction X should be understood as the distance between two opposite surfaces of the main body 121 along the thickness direction X. In this application, the bottom of the main body 121 is formed with a partial receiving groove 120. By limiting the thickness dimension of the main body 121 to between 2.0 mm and 3.0 mm, the welding strength between the electrode post 12 and the busbar is ensured, guaranteeing the current carrying capacity. Specifically, L3 can be any value from 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, and 3.0mm, or a range between two values. Within this range, the larger L3 is, the higher the welding strength between the main body 121 and the busbar, resulting in higher welding reliability. The smaller L3 is, the smaller the thickness space occupied by the main body 121, achieving a lightweight battery design.

[0059] By limiting the thickness of the first connecting portion 122 to between 1.5 mm and 2.0 mm, sufficient strength is ensured to support the terminal post 12 on the cover plate body 11. Specifically, L4 can be any value among 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, and 2.0 mm, or a range between two values. Within the above range, the larger L4 is, the higher the structural strength of the first connecting portion 122, the less prone it is to deformation, and the more stable the assembly position of the terminal post 12 is; the smaller L4 is, the smaller the thickness space required for the assembly of the cover plate assembly 1, achieving a lightweight battery design.

[0060] By limiting the thickness of the second connecting portion 123 to between 1.1 mm and 2.1 mm, sufficient space in the thickness direction X is ensured for the connecting block 13 to be embedded in the limiting groove 124 formed by the second connecting portion 123 and the main body portion 121. This ensures a more stable connection between the connecting block 13 and the second connecting portion 123, making the fixing structure of the cover plate assembly 1 more compact and the structural layout more reasonable. Specifically, L5 can be any value or a range between two values ​​from 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, and 2.1 mm. Within the above range, the larger L5 is, the larger the space in the thickness direction X of the limiting groove 124, which facilitates the assembly of the connecting block 13 and improves assembly efficiency. The smaller L5 is, the more compact the fixing structure of the cover plate assembly 1 and the more reasonable the structural layout.

[0061] Please see Figure 6 As shown, in some embodiments, the cover plate assembly 1 further includes a sealing element 15, which includes a first sealing section 151, a second sealing section 152, and a third sealing section 153. The first sealing section 151 is disposed between the main body 121 and the cover plate body 11, the second sealing section 152 is sandwiched between the cover plate body 11 and the connecting block 13, and the third sealing section 153 is embedded in the limiting groove 124 and sandwiched between the main body 121 and the connecting block 13. The first sealing section 151 connects the second sealing section 152 and the third sealing section 153 respectively. It should be understood that the first sealing section 151, disposed between the main body 121 and the cover plate body 11, effectively fills the gap between the two, enhances the tightness of the connection between the main body 121 and the cover plate body 11, and forms an insulating protection between the main body 121 and the cover plate body 11. The second sealing section 152 is sandwiched 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 sealing section 152 can act as a buffer between the connecting block 13 and the cover plate body 11, preventing damage to the connection part due to stress concentration. The third sealing section 153 is embedded in the limiting groove 124 and sandwiched between the main body 121 and the connecting block 13, restricting the relative movement of the main body 121 and the connecting block 13 within the limiting groove 124, ensuring that the entire connection structure remains stable under various operating conditions, thereby improving the overall structural stability of the battery. The three sealing sections act on the gaps between the main body 121 and the cover plate body 11, the cover plate body 11 and the connecting block 13, and the main body 121 and the connecting block 13, respectively, forming multiple sealing defenses and 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 stable current transmission between components such as the terminal 12 and the connecting block 13, improves the reliability of electrical connection during battery charging and discharging, and ensures the efficient and stable operation of the battery.

[0062] Please see Figure 6 As shown, in some embodiments, the electrode assembly 2 further includes an electrode body 21 and a tab 22. The tab 22 includes a first segment 221 and a second segment 222 connected together. The first segment 221 is connected to the electrode body 21 and extends partially into the receiving groove 120. The second segment 222 is connected to the end of the first segment 221 away from the electrode body 21 and is connected to one side of the body portion 121 in the thickness direction X. It should be understood that by opening the receiving groove 120 on the electrode post 12, the first segment 221 of the tab 22 is connected to the electrode body and partially housed in the receiving groove 120, which plays a role in housing and protecting it. The tab 22 is not easily affected by external factors, improving the stability of the connection between the tab 22 and the electrode post 12. The second segment 222 of the tab 22 is connected to one side of the body portion 121 in the thickness direction X, so that a stable connection is formed between the tab 22 and the electrode post 12, ensuring the reliability of the internal circuit connection of the battery and reducing the risk of failure due to loose connection. The two-section structure of the tab 22 reduces the number of bends, effectively shortens the current transmission path, reduces resistance, and reduces energy loss, thereby improving the charging and discharging efficiency of the battery and enhancing the overall performance of the battery.

[0063] Please see Figure 4 and Figure 6 As shown, in some embodiments, a recess 111 is provided on the side of the cover plate body 11 facing the connecting block 13. The recess 111 communicates with the assembly hole 110 and the limiting groove 124. The recess 111 has a first wall 1111 facing the connecting block 13, and the limiting groove 124 has a second wall 1211 facing the connecting 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 providing a recess 111 on the cover plate body 11 to accommodate the second sealing section 152, the space required for assembling the sealing element 15 is reduced, thereby improving space utilization. By setting the second wall 1211 of the main body 121 and the first wall 1111 of the sink 111 to be on the same plane, the compression of the second sealing section 152 and the third sealing section 153 is consistent, thereby improving the assembly efficiency of the cover plate assembly 1 and ensuring the connection stability between the cover plate body 11, the connecting block 13 and the pole post 12. The components are subjected to uniform force, reducing the risk of structural damage caused by excessive local stress.

[0064] This application also discloses a battery pack, including a single battery cell as described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned single battery cell, which will not be repeated here.

[0065] In the above embodiments, the descriptions of each embodiment have different focuses. The above embodiments can be combined with each other. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0066] The foregoing has provided a detailed description of a single battery cell and a battery pack provided in the embodiments of this application, and 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 technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A single-cell battery, characterized in that, include: A cover plate assembly (1) and an electrode assembly (2), wherein the electrode assembly (2) is disposed on one side of the cover plate assembly (1) in its thickness direction (X); The cover plate assembly (1) includes: The cover plate body (11) has an assembly hole (110) along the thickness direction (X); The electrode post (12) includes a first connecting part (122), a main body part (121) and a second connecting part (123). The main body part (121) passes through the assembly hole (110). The first connecting part (122) is disposed on the side of the cover plate body (11) away from the electrode assembly (2) and surrounds the main body part (121). The second connecting part (123) is disposed on the side of the main body part (121) facing the electrode assembly (2). The second connecting part (123) and the main body part (121) form a limiting groove (124). A connecting block (13) is disposed on the side of the cover plate body (11) away from the first connecting part (122) and is partially embedded in the limiting groove (124). The cover plate body (11) is sandwiched between the first connecting part (122) and the connecting block (13). On a plane perpendicular to the thickness direction (X), the second connecting part (123) and the orthographic projection of the connecting block (13) have an overlapping area, the radial width of the overlapping area is W mm, which satisfies: 0.15≤W≤1.

2. The single-cell battery according to claim 1, characterized in that, The second connecting part (123) is arranged circumferentially and together with the main body part (121) forms a receiving groove (120).

3. The single-cell battery according to claim 2, characterized in that, The second connecting portion (123) includes a base segment (1231) and a riveting segment (1232). The base segment (1231) is connected to the main body portion (121), and the riveting segment (1232) is connected to the end of the base segment (1231) away from the main body portion (121) and protrudes in a direction away from the receiving groove (120). The connecting block (13) includes a protrusion (131) which is embedded in the limiting groove (124) and abuts against the riveting section (1232) in the thickness direction (X).

4. The single-cell battery according to claim 3, characterized in that, The riveting section (1232) has a first stepped surface (1230), which is located on the side of the riveting section (1232) away from the receiving groove (120); The protrusion (131) has a second stepped surface (1310), which is disposed opposite to the first stepped surface (1230); The cover plate assembly (1) further includes a welding part (14), which connects the first step surface (1230) and the second step surface (1310) respectively.

5. The single-cell battery according to claim 3, characterized in that, On a plane perpendicular to the thickness direction (X), the base segment (1231) has a diameter-width dimension W1 mm, satisfying: 1.0≤W1≤1.5; Along the thickness direction (X), the riveting segment (1232) has a thickness dimension L mm, satisfying: 0.35≤L≤0.6; And / or, along the thickness direction (X), the connecting block (13) has a thickness dimension L1 mm, and the protrusion (131) has a thickness dimension L2 mm, satisfying: 0.65≤L1≤1.5, 0.2≤L2≤0.

8.

6. The single-cell battery according to claim 1, characterized in that, Along the thickness direction (X), the main body (121) has a thickness dimension L3 mm, the first connecting part (122) has a thickness dimension L4 mm, and the second connecting part (123) has a thickness dimension L5 mm, satisfying: 2.0≤L3≤3.0, 1.5≤L4≤2, 1.1≤L5≤2.

1.

7. The single-cell battery according to claim 1, characterized in that, The cover plate assembly (1) further includes a sealing element (15), which includes a first sealing section (151), a second sealing section (152), and a third sealing section (153). The first sealing section (151) is disposed between the main body (121) and the cover plate body (11). The second sealing section (152) is sandwiched between the cover plate body (11) and the connecting block (13). The third sealing section (153) is embedded in the limiting groove (124) and sandwiched between the main body (121) and the connecting block (13). The first sealing section (151) connects the second sealing section (152) and the third sealing section (153) respectively.

8. The single-cell battery according to claim 2, characterized in that, The electrode assembly (2) further includes an electrode body (21) and a tab (22). The tab (22) includes a first segment (221) and a second segment (222) connected together. The first segment (221) is connected to the electrode body (21) and extends partially into the receiving groove (120). The second segment (222) is connected to the end of the first segment (221) away from the electrode body (21) and is connected to the body portion (121) on one side in the thickness direction (X).

9. The single-cell battery according to claim 1, characterized in that, The cover plate body (11) has a recessed groove (111) on the side facing the connecting block (13), and the recessed groove (111) is connected to the assembly hole (110) and the limiting groove (124); The sink (111) has a first wall (1111) facing the connecting block (13), and the limiting groove (124) has a second wall (1211) facing the connecting block (13). The first wall (1111) and the second wall (1211) are on the same plane perpendicular to the thickness direction (X).

10. A battery pack, characterized in that, Includes a single cell battery as described in any one of claims 1 to 9.

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