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, the single battery comprises a shell, an electrode assembly, a cover plate, a pole body, a pole base and a sealing element; an exhaust groove is formed in one side, facing the cover plate, of the pole base, the exhaust groove is communicated with the interior of the shell, and the exhaust groove and the second sealing part are arranged at intervals in the length direction. Through the arrangement of the exhaust groove, if a sealing element is neglected to be installed, gas is introduced from the lower part of the top cover body to the upper part of the top cover body, the gas can be directly exhausted from the space between the pole column body and the cover plate through the exhaust groove, and when the gas is detected by detection equipment, airtight failure can be detected, so that the accuracy of airtight detection is improved; and the reliability and the safety of the single battery are improved.

Description

Technical Field

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

[0002] With the development and application of battery technology, the requirements for individual battery cells are becoming increasingly stringent. Among these requirements, the airtightness of the cover plate plays a crucial role in the safety, reliability, and assembly process of individual battery cells.

[0003] Air tightness testing is typically used to test the effectiveness of the compression seal of the sealing ring. However, in some cases, even if the sealing ring is missing, the air tightness failure cannot be detected because the lower plastic and the pole base are in close contact and the path is too long, resulting in low accuracy of air tightness testing. Utility Model Content

[0004] Purpose of the utility model: The embodiments of this application provide a single battery cell, which aims to solve the technical problem of how to improve the accuracy of airtightness detection; another purpose of the embodiments of this application is to provide a battery pack.

[0005] Technical solution: This application provides a single-cell battery, which has intersecting height and length directions. The single-cell battery includes:

[0006] case;

[0007] The electrode assembly is located inside the housing;

[0008] A cover plate is connected to one end of the housing along its height direction. The cover plate has a through-hole in the height direction.

[0009] The electrode body is inserted into the electrode hole;

[0010] The electrode base is connected to the end of the electrode body that is close to the electrode assembly along the height direction. The electrode base is located inside the housing. An exhaust groove is provided on the side of the electrode base facing the cover plate. The exhaust groove is recessed along the height direction towards the electrode assembly and is connected to the inside of the housing.

[0011] The sealing element includes a first sealing portion, which abuts against the cover plate and the pole post base along the height direction, and an exhaust groove is provided at intervals from the first sealing portion along the length direction.

[0012] In some embodiments, the single cell further includes a first insulating member located inside the housing. The first insulating member is connected to the side of the cover plate facing the electrode assembly. A portion of the first insulating member is located between the cover plate and the electrode base along the height direction. A portion of the first insulating member covers a portion of the venting groove along the height direction. A portion of the first insulating member has a gap with the electrode base along the length direction. The gap communicates with the venting groove and the inside of the housing.

[0013] In some embodiments, the exhaust channel extends from the edge of the pole post body toward the edge of the pole post base and passes through the edge of the pole post base, and the exhaust channel has multiple sidewalls.

[0014] The side wall near the pole body is spaced apart from the first sealing part.

[0015] In some embodiments, the pole base is provided with a plurality of venting grooves, which are spaced apart along the direction surrounding the seal.

[0016] In some embodiments, the electrode post body is provided with a positioning hole, which is located on the side of the electrode post body away from the electrode assembly along the height direction, and the positioning hole is recessed towards the electrode assembly along the height direction.

[0017] In some embodiments, the single cell further includes a second sealing portion, which is connected to the first sealing portion along the height direction. The second sealing portion passes through the terminal hole and is disposed around the terminal body. Along the length direction, the second sealing portion abuts against the terminal body and the cover plate.

[0018] In some embodiments, the single cell further includes a second insulating member and a riveting member. The second insulating member is located on the side of the cover plate away from the electrode assembly, and the riveting member is located on the side of the second insulating member away from the cover plate. The end of the electrode body away from the electrode base passes through the second insulating member so that the electrode body and the riveting member are fixedly connected.

[0019] In some embodiments, the end of the second sealing portion that is away from the first sealing portion along the height direction abuts against the second insulating member.

[0020] In some embodiments, one of the second insulating member and the cover plate is provided with a boss, and the other of the second insulating member and the cover plate is provided with a groove, the boss being fitted into the groove to connect the second insulating member and the cover plate.

[0021] Accordingly, this application provides a battery pack including the aforementioned single battery cell.

[0022] Beneficial effects: In the single-cell battery of this application embodiment, a venting groove is provided on the side of the terminal base facing the cover plate. The venting groove is connected to the inside of the casing and is spaced apart from the second sealing part along the length direction. By providing the venting groove, assuming the sealing element is missing, gas enters from below the top cover body to above the top cover body. The gas can be directly discharged from between the terminal body and the cover plate through the venting groove. The detection equipment can detect the gas and thus detect the airtightness failure, improving the accuracy of airtightness detection and improving the reliability and safety of the single-cell battery.

[0023] The battery pack of this application embodiment includes the above-described single battery cell, and therefore the battery pack can have all the technical features and beneficial effects of the above-described single battery cell, which will not be repeated here. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application;

[0026] Figure 2 This is an exploded view of a single battery cell according to an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the structure of a cover plate assembly according to an embodiment of this application;

[0028] Figure 4 This is a top view of a cover plate assembly according to an embodiment of this application;

[0029] Figure 5 This is a bottom view of a cover plate assembly according to an embodiment of this application;

[0030] Figure 6 This is a cross-sectional view of a cover plate assembly according to an embodiment of this application;

[0031] Figure 7 yes Figure 6 Enlarged view of part A;

[0032] Figure 8 This is a schematic diagram of the structure of an electrode body and an electrode base according to an embodiment of this application;

[0033] Figure 9 This is a schematic diagram of the structure of a pole body and a pole base according to another embodiment of this application;

[0034] Figure 10 This is a cross-sectional view of an embodiment of the pole body and pole base of this application;

[0035] Figure 11 This is a schematic diagram of the structure of a second insulating member according to an embodiment of this application;

[0036] Figure 12 This is a schematic diagram of the structure of a second insulating member according to another embodiment of this application;

[0037] Figure 13 This is a cross-sectional view of a second insulating member according to an embodiment of this application;

[0038] Figure 14 This is a schematic diagram of the structure of a cover plate according to an embodiment of this application;

[0039] Figure 15 This is a top view of a cover plate according to an embodiment of this application;

[0040] Figure 16 This is a cross-sectional view of a cover plate according to an embodiment of this application.

[0041] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Cover plate assembly; 3. Seal; 4. First insulating element; 5. Second insulating element; 6. Boss; 7. Groove; 8. Rivet; 9. Gap; 10. Electrode assembly; 20. Cover plate; 21. Electrode body; 22. Electrode base; 31. First sealing part; 30. Second sealing part; 200. Electrode hole; 210. Positioning hole; 220. Exhaust groove; 2200. Side wall; X, Height direction; Y, Length direction. Detailed Implementation

[0042] 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.

[0043] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element 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 on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0044] The applicant noted that with the development and application of battery technology, the requirements for individual battery cells are becoming increasingly stringent. Among these requirements, the airtightness of the cover plate plays a crucial role in the safety, reliability, and assembly process of individual battery cells. Airtightness testing is typically used to test the effectiveness of the compression seal of the sealing ring. However, in some cases, even if the sealing ring is missing, the tight contact between the lower plastic and the terminal base, along with the long path, makes it impossible to detect airtightness failure, resulting in low accuracy of airtightness testing.

[0045] In view of this, this application provides a single-cell battery. The single-cell battery has a height direction and includes a housing, an electrode assembly, a cover plate, a terminal body, a terminal base, and a sealing element. The electrode assembly is located inside the housing; the cover plate is connected to one end of the housing along the height direction and has a terminal hole extending through the housing along the height direction; the terminal base is connected to one end of the terminal body near the electrode assembly along the height direction and is located inside the housing; the side of the terminal base facing the cover plate has an exhaust groove, which is recessed along the height direction towards the electrode assembly and communicates with the inside of the housing; the sealing element includes a first sealing part and a second sealing part connected along the height direction; the first sealing part passes through the terminal hole and surrounds the terminal body, and abuts against the terminal body and the cover plate along the length direction; the second sealing part abuts against the cover plate and the terminal base along the height direction, and the exhaust groove is spaced apart from the second sealing part along the length direction. By setting up an exhaust channel, assuming the seal is missing, gas enters from below the top cover body to above the top cover body. The gas can be directly discharged between the electrode body and the cover plate through the exhaust channel. The detection equipment can detect the gas and detect the airtightness failure, thereby improving the accuracy of airtightness detection and improving the reliability and safety of the single cell.

[0046] The single-cell battery and battery pack of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0047] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application; Figure 2 This is an exploded view of a single battery cell according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a cover plate assembly 2 according to an embodiment of this application; Figure 4 This is a top view of a cover plate assembly 2 according to an embodiment of this application; Figure 5 This is a bottom view of a cover plate assembly 2 according to an embodiment of this application; Figure 6 This is a cross-sectional view of a cover plate assembly 2 according to an embodiment of this application;

[0048] Figure 7 yes Figure 6 Enlarged view of part A; Figure 8This is a schematic diagram of the structure of an pole body 21 and a pole base 22 according to an embodiment of this application; Figure 9 This is a schematic diagram of the structure of a pole body 21 and a pole base 22 according to another embodiment of this application; Figure 10 This is a cross-sectional view of an embodiment of the present application of the pole body 21 and the pole base 22; Figure 11 This is a schematic diagram of the structure of a second insulating member 5 according to an embodiment of this application; Figure 12 This is a schematic diagram of the structure of a second insulating member 5 according to another embodiment of this application; Figure 13 This is a cross-sectional view of a second insulating member 5 according to an embodiment of this application; Figure 14 This is a schematic diagram of the structure of a cover plate 20 according to an embodiment of this application;

[0049] Figure 15 This is a top view of a cover plate 20 according to an embodiment of this application; Figure 16 This is a cross-sectional view of a cover plate 20 according to an embodiment of this application.

[0050] refer to Figures 1 to 16 This application provides a single-cell battery. The single-cell battery has intersecting height direction X and length direction Y. The single-cell battery includes a housing 1, an electrode assembly 10, a cover plate assembly 2, and a sealing element 3. The electrode assembly 10 is located inside the housing 1. The cover plate assembly 2 includes a cover plate 20, an electrode post body 21, and an electrode post base 22. The cover plate 20 is connected to one end of the housing 1 along the height direction X. The cover plate 20 has an electrode post hole 200 that extends along the height direction X. The electrode post body 21 passes through the electrode post hole 200. The electrode post base 22 is connected to the electrode post body 21. The column body 21 is connected to one end of the electrode assembly 10 along the height direction X. The electrode base 22 is located inside the housing 1. An exhaust groove 220 is provided on the side of the electrode base 22 facing the cover plate 20. The exhaust groove 220 is recessed along the height direction X towards the electrode assembly 10 and communicates with the inside of the housing 1. The sealing element 3 includes a first sealing part 31, which abuts against the cover plate 20 and the electrode base 22 along the height direction X. The exhaust groove 220 is spaced apart from the first sealing part 31 along the length direction Y. By providing the exhaust groove 220, airtightness failure can be detected during airtightness testing when the sealing element 3 is missing. The exhaust groove 220 can assist in the accurate identification of sealing failure during airtightness testing, which helps to optimize the production process and improve production efficiency. Furthermore, the spaced arrangement between the sidewall 2200 of the vent groove 220 and the first sealing part 31 can prevent the first sealing part 31 from partially overlapping with the vent groove 220, which could cause the first sealing part 31 to shift or even squeeze into the vent groove 220, thus affecting the sealing effect between the first sealing part 31 and the terminal base 22. This ensures a good sealing connection between the cover plate 20 and the terminal body 21, as well as between the terminal base 22 and the sealing element 3, improving the reliability and safety of the single battery cell.

[0051] In some embodiments, in the longitudinal direction Y, the vent groove 220 has a sidewall 2200 near the first sealing portion 31, and the sidewall 2200 is spaced apart from the first sealing portion 31. Specifically, in Figure 7 In the embodiment shown, the sidewall 2200 and the first sealing part 31 are spaced apart in the length direction Y.

[0052] exist Figure 7 In the illustrated embodiment, the sidewall 2200 and the first sealing portion 31 have a dimension L1 mm, satisfying: 0.3 ≤ L1 ≤ 0.5. Exemplarily, in the length direction Y, the dimension L1 between the sidewall 2200 and the first sealing portion 31 can be any one value or a range between any two values ​​from 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, and 0.5.

[0053] When the dimension L1 of the sidewall 2200 of the vent groove 220 and the first sealing part 31 in the length direction Y is too small, due to tolerance, the first sealing part 31 may partially overlap with the vent groove 220. Furthermore, since the first sealing part 31 is typically made of flexible material, when squeezed by the cover assembly 2, some of the sealing material of the first sealing part 31 may be squeezed into the vent groove 220, affecting the sealing effect between the first sealing part 31 and the terminal base 22. Excessive sealing material entering the vent groove 220 will also worsen the sealing of the surrounding contact surface, leading to a risk of seal failure and affecting the reliability and safety of the single battery cell. Conversely, when the dimension L1 of the sidewall 2200 of the vent groove 220 and the first sealing part 31 in the length direction Y is too large, it will cause unnecessary waste of space, resulting in an increase in the size of the terminal base 22 and increased production costs. By limiting the dimension L1 of the side wall 2200 of the exhaust groove 220 and the first sealing part 31 in the length direction Y, a good sealing connection can be ensured between the cover plate 20 and the pole body 21 and between the pole base 22 and the first sealing part 31, while avoiding space waste and reducing production costs.

[0054] In some embodiments, the single cell further includes a first insulating member 4, which is located inside the housing 1. The first insulating member 4 is connected to the side of the cover plate 20 facing the electrode assembly 10. A portion of the first insulating member 4 is located between the cover plate 20 and the terminal base 22 along the height direction X. A portion of the first insulating member 4 covers a portion of the vent groove 220 along the height direction X. A portion of the first insulating member 4 leaves a gap 9 with the terminal base 22 along the length direction Y. The gap 9 communicates with the vent groove 220 and the inside of the housing 1. The first insulating member 4 covers a portion of the vent groove 220. When the sealing member 3 is installed, the vent groove 220 does not affect the sealing between the terminal base 22 and the cover plate assembly 2. The terminal body 21 is located on the side of the terminal base 22 away from the electrode assembly 10. When the sealing member 3 is missing, gas can escape sequentially through the vent groove 220, the gap 9, and between the terminal body 21 and the cover plate 20, enabling leakage to be detected in the airtightness test, improving the accuracy of the airtightness test, avoiding the risk of airtightness test failure, and improving the reliability and safety of the single cell.

[0055] exist Figure 7 In the illustrated embodiment, the single-cell battery further includes a second sealing portion 30. The second sealing portion 30 is connected to the first sealing portion 31 along the height direction X. The second sealing portion 30 passes through the terminal hole 200 and surrounds the terminal body 21. Along the length direction Y, the second sealing portion 30 abuts against the terminal body 21 and the cover plate 20. The second sealing portion 30 abuts between the cover plate 20 and the terminal body 21, which can improve the sealing performance between the cover plate 20 and the terminal body 21.

[0056] In some embodiments, the vent groove 220 extends from the edge of the pole post body 21 toward the edge of the pole post base 22 and passes through the edge of the pole post base 22. The vent groove 220 has a sidewall 2200; the sidewall 2200 near the pole post body 21 is spaced apart from the second sealing portion 30. Specifically, in Figure 7 In the illustrated embodiment, the venting groove 220 extends from the edge of the pole base 22 toward the pole body 21, and the venting groove 220 has a plurality of sidewalls 2200; in the length direction Y, the sidewall 2200 closest to the pole body 21 among the plurality of sidewalls 2200 has a dimension L2 mm between it and the first insulating member 4, satisfying: 0.3≤L2≤0.5. Exemplarily, in the length direction Y, the dimension L2 between the sidewall 2200 closest to the pole body 21 and the first insulating member 4 among the plurality of sidewalls 2200 can be any one value or a range between any two values ​​of 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5.

[0057] In the length direction Y, if the dimension L2 between the sidewall 2200 closest to the pole body 21 and the first insulating member 4 is too small, the first insulating member 4 may completely cover the exhaust groove 220 after being compressed. If the exhaust groove 220 is blocked by the first insulating member 4, gas cannot escape through it, posing a risk of missed detection during airtightness testing. Conversely, if the dimension L2 between the sidewall 2200 closest to the pole body 21 and the first insulating member 4 is too large, it will cause unnecessary waste of space, increasing the size of the pole base 22 and raising production costs.

[0058] In some embodiments, the pole base is provided with a plurality of venting grooves 220, which are spaced apart along the direction surrounding the seal 3. Figure 8 and Figure 9 In the illustrated embodiment, multiple venting grooves 220 are disposed around the periphery of the terminal body 21 and are evenly distributed on the side of the terminal base 22 facing the terminal body 21. The multiple venting grooves 220 can distribute gas pressure at different locations, ensuring that the seal 3 is subjected to uniform pressure in all directions. This guarantees a good sealing connection between the cover plate 20 and the terminal body 21, and between the terminal base 22 and the seal 3, reducing the risk of gas leakage and improving the overall sealing performance of the battery. The venting grooves 220 evenly distributed on the side of the terminal base 22 facing the terminal body 21 avoid detection blind spots or inaccurate local detection during airtightness testing, improving the comprehensiveness and accuracy of airtightness testing, and thus accurately identifying sealing failures.

[0059] In some embodiments, the electrode post body 21 is provided with a positioning hole 210. The positioning hole 210 is located on the side of the electrode post body 21 away from the electrode assembly 10, and the positioning hole 210 is recessed along the height direction X towards the side closer to the electrode assembly 10, such as... Figures 6 to 10 As shown. Exemplarily, the accurate position of the electrode body 21 is determined by measuring the position of a probe in a position measuring device against a measurement point on the target object, in conjunction with the positioning hole 210. Specifically, the probe is typically a sphere with a diameter of 1 mm. The sphere is inserted into the positioning hole 210 and abuts against the bottom wall of the positioning hole 210 to measure the relative positional relationship between the center of the sphere and the set reference surface of the electrode body 21. This assesses whether the position of the electrode body 21 and the electrode base 22 connected to the electrode body 21 meets the design requirements, ensuring the precise alignment of the electrode body 21 and the electrode base 22 during the single-cell assembly process, thereby guaranteeing the connection and performance of the single-cell battery.

[0060] exist Figure 10In the illustrated embodiment, the positioning hole 210 has a size D mm in the length direction Y, satisfying: 1.5 ≤ D ≤ 2.5. Exemplarily, the size D of the positioning hole 210 in the length direction Y can be any one value or a range between any two values ​​from 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5.

[0061] exist Figure 7 In the embodiment shown, the single cell also includes a second insulating member 5 and a riveting member 8. The second insulating member 5 is located on the side of the cover plate 20 away from the electrode assembly 10, and the riveting member 8 is located on the side of the second insulating member 5 away from the cover plate 20. The end of the electrode post body 21 away from the electrode post base 22 passes through the second insulating member 5 so that the electrode post body 21 is fixedly connected to the riveting member 8.

[0062] The end of the second sealing portion 30 that is away from the first sealing portion 31 along the height direction X abuts against the second insulating member 5. By providing the second sealing portion 30, the sealing performance of the single cell can be further improved.

[0063] exist Figure 6 In the illustrated embodiment, the electrode body 21 and the positioning hole 210 on the electrode body 21 are formed by riveting. The riveting process limits the dimension D of the positioning hole 210 in the length direction Y. If the dimension D of the positioning hole 210 in the length direction Y is too small, it will be difficult to insert the probe into the positioning hole 210, increasing the difficulty of testing and limiting the adjustment angle of the probe within the positioning hole 210, thus affecting the accuracy of position measurement. In addition, a dimension D that is too small may also cause the probe to be easily bumped when inserted, affecting the probe's service life and reliability. If the dimension D of the positioning hole 210 in the length direction Y is too large, the position of the probe in the positioning hole 210 will be unstable, affecting the stability and accuracy of probe positioning. Furthermore, a dimension D that is too large will affect the riveting quality of the electrode body 21, resulting in poor resistance stability of the electrode. It is understandable that by limiting the dimension D of the positioning hole 210 in the length direction Y, the probe can be better accommodated, so that there is appropriate contact and fit between the probe and the positioning hole 210, thereby improving the accuracy and stability of the position measurement, and also ensuring the riveting quality of the pole body 21 and improving the resistance stability.

[0064] exist Figure 10 In the illustrated embodiment, the positioning hole 210 has a dimension H mm in the height direction X, satisfying: 1.2 ≤ H ≤ 2. Exemplarily, the dimension H of the positioning hole 210 in the height direction X can be any one value or a range between any two values ​​from 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.

[0065] If the dimension H of the positioning hole 210 in the height direction X is too small, it will not provide sufficient depth for the probe, affecting the accuracy and reliability of the position measurement. If the dimension H of the positioning hole 210 in the height direction X is too large, it will reduce the strength of the pole body 21, making it more prone to deformation or damage during use. By limiting the dimension H of the positioning hole 210 in the height direction X, the requirements for positioning and pole position measurement are met without excessively weakening the structural strength of the pole, ensuring the structural stability of the pole. In addition, providing a suitable depth for measuring the pole position helps to improve the accuracy and precision of the measurement.

[0066] In some embodiments, one of the second insulating member 5 and the cover plate 20 is provided with a boss 6, and the other of the second insulating member 5 and the cover plate 20 is provided with a groove 7. The boss 6 is embedded in the groove 7 to connect the second insulating member 5 and the cover plate 20. The riveting member 8 is located on the side of the second insulating member 5 away from the cover plate 20, and the riveting member 8 is connected to the electrode body 21 through a stepped engagement. By providing the boss 6 and the groove 7 that matches the boss 6 on the second insulating member 5 and the cover plate 20, the torsional resistance of the electrode body 21 relative to the cover plate 20 can be effectively improved. During the use of a single battery cell, the electrode may be subjected to external forces and torque. By improving the torsional resistance of the electrode, it can be ensured that the electrode is not easily deformed or displaced when subjected to torsional forces, thereby maintaining the stability of the internal structure of the single battery cell and improving the safety and reliability of the single battery cell.

[0067] exist Figures 11 to 13 In the illustrated embodiment, there are multiple bosses 6, which are disposed along the edge of the second insulating member 5. Figures 14 to 16 In the embodiment shown, a plurality of grooves 7 matching the bosses 6 are provided on the cover plate 20.

[0068] exist Figure 13 and Figure 16 In the illustrated embodiment, the cover plate 20 has a height direction X. In the height direction X, the boss 6 has a dimension L3 mm, and the groove 7 has a dimension L4 mm, satisfying: 0.55 ≤ L3 ≤ 0.9, 0.06 ≤ L4 - L3 ≤ 0.2. Exemplarily, the dimension L3 of the boss 6 in the length direction Y can be any one or a range between any two of the following values: 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9. In the length direction Y, the difference between the dimension L4 of the groove 7 and the dimension L3 of the boss 6 can be any one or a range between any two of the following values: 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2.

[0069] If the dimension L3 of the boss 6 in the height direction X is too small, the boss 6 cannot provide sufficient support and connection strength, resulting in a decrease in the torsional resistance of the electrode post and making it prone to failure under torsional force. If the dimension L3 of the boss 6 in the height direction X is too large, it will affect the assembly accuracy and tightness of the fit between the cover plate 20 and the second insulating component 5. If the difference between the dimension L4 of the groove 7 and the dimension L3 of the boss 6 is too small, the boss 6 may not be able to fully embed into the groove 7 during assembly, resulting in incomplete assembly or requiring additional force for assembly, thus affecting production efficiency. If the difference between the dimension L4 of the groove 7 and the dimension L3 of the boss 6 is too large, the fit between the boss 6 and the groove 7 will not be tight enough, and relative sliding or misalignment may easily occur under torsional force, affecting the torsional resistance. By limiting the dimension L3 of the boss 6 in the height direction X, and the difference between the dimension L4 of the groove 7 and the dimension L3 of the boss 6, the stability and torsional resistance of the electrode post structure can be enhanced, improving the safety and reliability of the single battery cell.

[0070] In some embodiments, the poles include a positive pole and a negative pole. A boss 6 is provided on the second insulating member 5 around the positive pole and the negative pole. The size of the boss 6 on the periphery of the positive pole and the size of the boss 6 on the periphery of the negative pole are designed differently to prevent mistakes and improve assembly efficiency.

[0071] Accordingly, this application provides a battery pack including the aforementioned single battery cell. Therefore, this battery pack can possess all the technical features and beneficial effects of the aforementioned single battery cell, which will not be elaborated further here.

[0072] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0073] The present application provides a detailed description of a single battery cell and a battery pack, and uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of the present 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. 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 the present application.

Claims

1. A single cell, characterized by, The monomer battery has intersecting height and length directions, and comprises: a shell; an electrode assembly located in the shell; a cover plate connected to one end of the shell along the height direction, the cover plate being provided with a pole post hole penetrating along the height direction; a pole post body penetrating the pole post hole; a pole post base connected to one end of the pole post body along the height direction and close to the electrode assembly, the pole post base being located in the shell, one side of the pole post base facing the cover plate being provided with an exhaust groove, the exhaust groove being recessed along the height direction towards the electrode assembly, the exhaust groove being in communication with the shell; a sealing member comprising a first sealing part, the first sealing part abutting the cover plate and the pole post base along the height direction, the exhaust groove and the first sealing part being spaced apart along the length direction.

2. The cell according to claim 1, wherein The monomer battery further comprises a first insulating member, the first insulating member being located in the shell, one side of the first insulating member facing the electrode assembly being connected to the cover plate, part of the first insulating member along the height direction being located between the cover plate and the pole post base, part of the first insulating member along the height direction covering part of the exhaust groove, part of the first insulating member along the length direction leaving a gap with the pole post base, the gap being in communication with the exhaust groove and the shell.

3. The cell according to claim 1, wherein The exhaust groove extends from the edge of the pole post body towards the pole post base and penetrates the edge of the pole post base, the exhaust groove having a side wall.

4. The cell according to claim 1, wherein The pole post base is provided with a plurality of exhaust grooves, the plurality of exhaust grooves being spaced apart along a direction surrounding the sealing member.

5. The cell according to claim 1, wherein The pole post body is provided with a positioning hole, the positioning hole being located on one side of the pole post body along the height direction and away from the electrode assembly, the positioning hole being recessed along the height direction towards the electrode assembly.

6. The cell according to claim 1, wherein The monomer battery further comprises a second sealing part, the second sealing part being connected to the first sealing part along the height direction, the second sealing part penetrating the pole post hole, and the second sealing part being arranged around the pole post body, the second sealing part abutting the pole post body and the cover plate along the length direction.

7. The cell according to claim 6, wherein The monomer battery further comprises a second insulating member and a riveting member, the second insulating member being located on one side of the cover plate away from the electrode assembly, the riveting member being arranged on one side of the second insulating member away from the cover plate, an end of the pole post body away from the pole post base penetrating the second insulating member, so that the pole post body is fixedly connected to the riveting member.

8. The cell according to claim 7, wherein An end of the second sealing part away from the first sealing part along the height direction abuts the second insulating member.

9. The cell according to claim 7, wherein One of the second insulating member and the cover plate is provided with a boss, and the other of the second insulating member and the cover plate is provided with a groove, the boss being embedded in the groove to connect the second insulating member and the cover plate.

10. A battery pack, characterized by, The monomer battery comprises any one of claims 1-9.

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