A battery cell and a battery pack

Abstract

This utility model relates to the field of new energy battery technology, and discloses a battery cell and a battery pack. The battery cell has a first direction and a second direction that are perpendicular to each other. The battery cell includes: a cover plate, which includes a top cover sheet and an insulating component. The top cover sheet has a first mounting hole and a terminal hole, and the insulating component has an assembly cavity; a terminal assembly, which is fixedly connected to the top cover sheet; a wireless controller, which is located in the assembly cavity and electrically connected to the terminal assembly; and a sealing assembly, which includes a connector and an insulating sealing part. The connector is fixedly connected to the top cover sheet and seals the first mounting hole. The connector has a second mounting hole, and the insulating sealing part seals the second mounting hole. The wireless controller is arranged in the assembly cavity of the insulating component and transmits the monitored information to the outside through wireless communication, thereby improving the sealing performance of the battery cell. The connector and the insulating sealing part can be prefabricated as a whole before being connected to the top cover sheet, avoiding interference with the connection between the top cover sheet and the terminal assembly.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery cell and battery pack. Background Technology

[0002] During use, the internal voltage, resistance, and temperature of lithium-ion batteries will change with the usage time and environment. When the values ​​of lithium-ion batteries change and exceed the normal range, it will lead to the risk of thermal runaway. Therefore, it is necessary to effectively monitor the state of the battery to ensure the safe use of lithium-ion batteries.

[0003] In existing lithium-ion battery monitoring systems, the controller is typically placed outside the cover, while some of the data acquisition lines and sensor probes are housed inside the casing. The controller and sensors are connected via wires, which reduces the internal space occupied by the lithium-ion battery. However, this poses a risk to the airtightness of the cover at the locations where wires pass through. Utility Model Content

[0004] The purpose of this invention is to provide a battery cell to solve the problem of sealing risks in the cover plates of lithium-ion batteries in the prior art; this invention also provides a battery pack using this battery cell.

[0005] To achieve the above objectives, this utility model provides a battery cell having a first direction and a second direction that are perpendicular to each other, and the battery cell includes:

[0006] The cover plate includes a top cover sheet and an insulating component fixedly connected to the top cover sheet. The top cover sheet is provided with a first mounting hole and a pole hole that penetrate the top cover sheet along a first direction. The first mounting hole and the pole hole are spaced apart along a second direction. The insulating component is provided with a mounting cavity.

[0007] A pole assembly is disposed in the pole hole, and the pole assembly is fixedly connected to the top cover plate;

[0008] A wireless controller is disposed in the assembly cavity, and the wireless controller is electrically connected to the pole assembly;

[0009] A sealing assembly includes a connector and an insulating sealing portion. The connector is fixedly connected to the top cover plate and blocks the first mounting hole. The connector has a second mounting hole that penetrates the connector along the first direction. The insulating sealing portion blocks the second mounting hole.

[0010] In some embodiments, the surface roughness of the connector is Ra1, and the surface roughness of the top cover is Ra2, satisfying that Ra1 > Ra2.

[0011] In some embodiments, the second assembly hole includes a first hole segment, a second hole segment, and a third hole segment. The second hole segment is connected between the first hole segment and the third hole segment along the first direction. The insulating sealing portion fills the first hole segment, the second hole segment, and the third hole segment. The minimum diameter of the first hole segment is R1 mm, the maximum diameter of the second hole segment is R2 mm, and the minimum diameter of the third hole segment is R3 mm, satisfying: R1 > R2, R3 > R2.

[0012] In some embodiments, the insulating component includes a first lower plastic and a second lower plastic that are interlocked with each other. The first lower plastic is fixedly connected to the top cover sheet, and the second lower plastic is spaced apart on the side of the first lower plastic away from the top cover sheet along the first direction. The first lower plastic and the second lower plastic together form the assembly cavity.

[0013] In some embodiments, the first lower plastic includes a body portion and ribs and buckles fixedly connected to the body portion. The second lower plastic has mating holes at both ends along a third direction, which penetrate the second lower plastic in the first direction. The buckles are inserted through the mating holes along the first direction and engage with the second lower plastic. The second lower plastic has ribs at both ends along the second direction. The body portion, the buckles, the ribs, and the second lower plastic enclose the assembly cavity. The first direction, the second direction, and the third direction are perpendicular to each other.

[0014] In some embodiments, the second lower plastic includes a main body portion and a fixing portion connected to each other. The mating hole is provided on the main body portion. The fixing portion is provided at both ends of the main body portion along the third direction. The fixing portion is fixedly connected to the main body portion. The fixing portion and the buckle are spaced apart along the third direction.

[0015] In some embodiments, the battery cell further includes an explosion-proof valve, and the top cover plate is provided with an explosion-proof hole penetrating the top cover plate along the first direction. The explosion-proof valve is fixedly connected to the top cover plate and blocks the explosion-proof hole. The explosion-proof hole and the first mounting hole are spaced apart along the second direction. The body portion is provided with a first pressure relief hole penetrating the body portion along the first direction, and the main body portion is provided with a second pressure relief hole penetrating the main body portion along the first direction. The explosion-proof valve is disposed opposite to the first pressure relief hole, and the second pressure relief hole is disposed opposite to the wireless controller along the first direction.

[0016] In some embodiments, the body portion is further provided with a third pressure relief hole that penetrates the body portion along the first direction, and along the first direction, the orthogonal projection of the rib plate onto the body portion is located between the first pressure relief hole and the third pressure relief hole.

[0017] In some embodiments, the main body portion is further provided with a weight reduction hole, which is spaced apart from the second pressure relief hole along the third direction.

[0018] This utility model also provides a battery pack, including the battery cells described in any of the above technical solutions.

[0019] Compared with the prior art, the battery cell and battery pack of this utility model embodiment have the following advantages: a wireless controller is installed in the assembly cavity of the insulating component and connected to the terminal assembly, thereby supplying power to the wireless controller. The wireless controller is arranged in the assembly cavity of the insulating component, located inside the battery cell, and transmits the monitored information to the outside through wireless communication. There is no need to install wires through the cover plate, which improves the sealing performance of the battery cell. In addition, the connector of the sealing component seals the first assembly hole on the top cover plate, while the insulating seal seals the second assembly hole on the connector. The insulating seal can prevent the wireless controller located in the assembly cavity from being electromagnetically shielded, ensuring the wireless transmission signal output of the wireless controller. The connector of the sealing component is fixedly connected to the top cover plate. The connector and the insulating seal can be prefabricated as a whole before being connected to the top cover plate, avoiding the connection between the top cover plate and the terminal assembly when processing the connector. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a single battery cell of this utility model;

[0021] Figure 2 yes Figure 1 A top view of the cover plate of the battery cell;

[0022] Figure 3 yes Figure 2 A bottom view of the cover plate;

[0023] Figure 4 yes Figure 2 A schematic diagram of the exploded structure of the cover plate;

[0024] Figure 5 yes Figure 4 A schematic diagram of the first plastic section of the cover plate;

[0025] Figure 6 yes Figure 5 A magnified view of part A of the first piece of plastic;

[0026] Figure 7 yes Figure 4 A schematic diagram of the structure of the second lower plastic part of the cover plate;

[0027] Figure 8 yes Figure 7 A schematic diagram of another embodiment of the second plastic;

[0028] Figure 9 Is with Figure 8 A magnified view of a portion of the first plastic material being fitted to the second plastic material.

[0029] Figure 10 yes Figure 4 A cross-sectional view of the sealing component.

[0030] In the diagram, 1. Shell, 2. Cover plate, 21. Top cover plate, 211. First assembly hole, 212. Terminal post hole, 213. Explosion-proof hole, 22. Insulating component, 221. Assembly cavity, 23. First lower plastic part, 231. Body part, 232. Rib plate, 233. Buckle, 234. First pressure relief hole, 235. Third pressure relief hole, 236. Fixing plate, 24. Second lower plastic part, 241. Mating hole, 242. Main body part. 243. Fixing part; 244. Second pressure relief hole; 245. Weight reduction hole; 3. Electrode assembly; 4. Insulating film; 5. Electrode post assembly; 6. Wireless controller; 7. Sealing assembly; 71. Connector; 72. Insulating sealing part; 73. Second assembly hole; 731. First hole section; 732. Second hole section; 733. Third hole section; 8. Explosion-proof valve; 9. Pin; Z, First direction; Y, Second direction; X, Third direction. Detailed Implementation

[0031] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0032] A preferred embodiment of a battery cell of this utility model is as follows: Figures 1 to 10 As shown, the battery cell includes a housing 1, a cover plate 2, an electrode assembly 3, an insulating film 4, a terminal assembly 5, a wireless controller 6, and a sealing assembly 7. The housing 1 and the cover plate 2 enclose a cavity, and the electrode assembly 3, the insulating film 4, and the wireless controller 6 are all disposed within the cavity. The housing 1 protects the internal components, and the insulating film 4 covers the electrode assembly 3 to insulate and isolate the housing 1 and the electrode assembly 3. The terminal assembly 5 is electrically connected to the electrode assembly 3.

[0033] The battery cell has a first direction Z, a second direction Y, and a third direction X. The first direction Z, the second direction Y, and the third direction X are perpendicular to each other. In this embodiment, the first direction Z is the height direction of the battery cell, the second direction Y is the width direction of the battery cell, and the third direction X is the thickness direction of the battery cell. The housing 1 is a cuboid with an open top, and the cover plate 2 is rectangular. The cavity formed by the housing 1 and the cover plate 2 is a cuboid space.

[0034] like Figure 4As shown, the cover plate 2 includes a top cover plate 21 and an insulating member 22. The top cover plate 21 is fixedly connected to the housing 1 to seal the opening at the top of the housing 1. The insulating member 22 is fixedly connected to the top cover plate 21 and is located on the side of the top cover plate 21 facing the housing 1 along the first direction Z. In this embodiment, both the top cover plate 21 and the housing 1 are made of aluminum and are welded together. The insulating member 22 is heat-fused to the top cover plate 21.

[0035] The top cover plate 21 has a first mounting hole 211 and a pole post hole 212 extending through the top cover plate 21 along a first direction Z. The first mounting hole 211 and the pole post hole 212 are spaced apart along a second direction Y. The first mounting hole 211 is used to install the sealing component 7, which can seal the top cover plate 21 and ensure the transmission signal of the wireless controller 6. The pole post component 5 is disposed in the pole post hole 212 and is fixedly connected to the top cover plate 21. The specific structure of the pole post component 5 is prior art and will not be described in detail here.

[0036] The insulating component 22 is provided with an assembly cavity 221, and the wireless controller 6 is installed in the assembly cavity 221. Since the insulating component 22 is located on the side of the top cover plate 21 close to the housing 1, after the top cover plate 21 is fixedly connected to the housing 1, the insulating component 22 is located in the receiving cavity formed by the top cover plate 21 and the housing 1, so that the wireless controller 6 is located inside the battery cell and will not be exposed outside the cover plate 2.

[0037] The wireless controller 6 is electrically connected to the terminal assembly 5. The wireless controller 6 receives power from the battery cell through the terminal assembly 5. Simultaneously, the wireless controller 6 has a built-in wireless module that can transmit collected relevant information wirelessly to the outside, eliminating the need for additional wires running through the cover plate 2 for power supply and signal transmission, thus increasing the sealing of the cover plate 2. In this embodiment, there are two terminal assemblies 5, which are the positive and negative terminals of the battery cell, respectively. Two pins 9 are connected to the wireless controller 6, and these two pins 9 are electrically connected to the positive and negative terminals, respectively, to supply power to the wireless controller 6.

[0038] The sealing assembly 7 includes a connector 71 and an insulating sealing part 72. The connector 71 is fixedly connected to the top cover plate 21 and blocks the first mounting hole 211. The connector 71 is provided with a second mounting hole 73 that penetrates the connector 71 along the first direction Z. The insulating sealing part 72 blocks the second mounting hole 73. The second mounting hole 73 on the connector 71 provides an assembly position for the insulating sealing part 72, and the insulating sealing part 72 can seal the second mounting hole 73.

[0039] In this embodiment, the first mounting hole 211 is a rectangular hole, and the connector 71 is a rectangular aluminum material adapted to the first mounting hole 211. The connector 71 is made of the same material as the top cover plate 21 and is welded and fixed to ensure that the connector 71 seals the first mounting hole 211. The insulating sealing part 72 is an injection molded part, which is filled into the second mounting hole 73 by injection molding.

[0040] Since both the housing 1 and the cover plate 2 are made of aluminum, they are prone to electromagnetic shielding, resulting in weak transmission signals for the wireless controller 6. A first mounting hole 211 is provided on the top cover to mount the sealing assembly 7. The insulating sealing part 72 of the sealing assembly 7 can seal the second mounting hole 73 of the connector 71 while ensuring the wireless transmission signal output of the controller. In some embodiments, the sealing assembly 7 and the controller can be positioned opposite each other along the first direction Z to further improve the wireless signal transmission effect.

[0041] The battery cell has a wireless controller 6 installed in the assembly cavity 221 of the insulating component 22, which is connected to the terminal assembly 5. This allows the wireless controller 6 to be powered. The wireless controller 6 is located inside the battery cell and transmits monitored information to the outside via wireless communication. This eliminates the need for wires to pass through the cover plate 2, thus improving the sealing of the battery cell. In addition, the connector 71 of the sealing assembly 7 seals the first assembly hole 211 on the top cover plate 21, while the insulating sealing part 72 seals the second assembly hole 73 on the connector 71. The insulating sealing part can prevent the wireless controller 6 located in the assembly cavity 221 from being electromagnetically shielded, ensuring the wireless transmission signal output of the wireless controller 6. The connector 71 of the sealing assembly 7 is fixedly connected to the top cover plate 21. The connector 71 and the insulating sealing part 72 can be prefabricated as a whole before being connected to the top cover plate 21, avoiding the connection between the top cover plate 21 and the terminal assembly 5 when the connector 71 is processed.

[0042] In some embodiments, the surface roughness of the connector 71 is Ra1, and the surface roughness of the top cover 21 is Ra2, satisfying that Ra1 > Ra2.

[0043] The surface roughness of the connector 71 is greater than that of the top cover plate 21, which can increase the bonding strength between the insulating seal 72 and the connector 71. The pole post assembly 5 needs to be installed on the top cover plate 21, and a compression sealing ring is required between the pole post assembly 5 and the top cover plate 21. The top cover plate 21 needs to maintain a smooth surface. Therefore, the first assembly hole 211 is opened on the top cover plate 21 to install the top cover plate 21 of the sealing assembly 7. The top cover plate 21 can be roughened before welding and fixing to the top cover plate 21, without the need to process the top cover plate 21 to increase its roughness, while meeting the assembly requirements of the insulating seal and the pole post assembly 5.

[0044] In this embodiment, the connector 71 is corroded with a chemical solution to create rough holes on its surface. Then, an insulating sealing part 72 is injection molded into the second assembly hole 73 of the connector 71. The insulating sealing part 72 and the connector 71 are pre-assembled into a whole and then fixedly connected to the top cover plate 21.

[0045] In some embodiments, the second assembly hole 73 includes a first hole segment 731, a second hole segment 732, and a third hole segment 733. The second hole segment 732 is connected between the first hole segment 731 and the third hole segment 733 along a first direction Z. The insulating sealing portion 72 fills the first hole segment 731, the second hole segment 732, and the third hole segment 733. The minimum hole diameter of the first hole segment 731 is R1 mm, the maximum hole diameter of the second hole segment 732 is R2 mm, and the minimum hole diameter of the third hole segment 733 is R3 mm, satisfying: R1 > R2, R3 > R2.

[0046] like Figure 10 As shown, in this embodiment, the first hole segment 731, the second hole segment 732, and the third hole segment 733 are all cylindrical holes. Therefore, the minimum hole diameter R1 of the first hole segment 731, the maximum hole diameter R2 of the second hole segment 732, and the minimum hole diameter R3 of the third hole segment 733 are all diameters of their respective segments. The maximum hole diameter R2 of the second hole segment 73, located in the middle along the first direction Z, is smaller than both the minimum hole diameter R1 of the first hole segment 731 and the minimum hole diameter R3 of the third hole segment 733. Therefore, when the insulating sealing part 72 is injection molded into the second mounting hole 73, it forms an "I"-shaped structure with a small size in the middle and large sizes at both ends along the first direction Z. The enlarged portions at both ends of the insulating sealing part 72 can increase the sealing performance of the second hole segment 732. When the top cover 21 deforms during the use of the battery cell, the insulating sealing part 72 will not deform and leak air. In other embodiments, the first hole segment 731, the second hole segment 732, and the third hole segment 733 may also be an arc-shaped hole or a tapered hole extending along the first direction Z.

[0047] In some embodiments, the insulating member 22 includes a first lower plastic 23 and a second lower plastic 24 that are interlocked with each other. The first lower plastic 23 is fixedly connected to the top cover plate 21, and the second lower plastic 24 is spaced apart on the side of the first lower plastic 23 away from the top cover plate 21 along the first direction Z. The first lower plastic 23 and the second lower plastic 24 enclose each other to form an assembly cavity 221.

[0048] like Figures 4 to 7 As shown, the first lower plastic 23 and the second lower plastic 24 are snapped together. The first lower plastic 23 and the second lower plastic 24 can provide insulation protection for the wireless controller 6, preventing the controller from short-circuiting with the electrode assembly 3. In addition, the snap-fit ​​is a detachable connection structure, which makes it convenient to insert the wireless controller 6 into the assembly cavity 221 and then install the second lower plastic 24 during assembly.

[0049] In some embodiments, the first lower plastic 23 includes a body portion 231 and ribs 232 and buckles 233 respectively fixedly connected to the body portion 231. The second lower plastic 24 is provided with mating holes 241 at both ends along the third direction X, which penetrate the second lower plastic 24 along the first direction Z. The buckles 233 are provided in the mating holes 241 along the first direction Z and are engaged with the second lower plastic 24. The second lower plastic 24 is provided with ribs 232 at both ends along the second direction Y. The body portion 231, buckles 233, ribs 232 and the second lower plastic 24 surround to form an assembly cavity 221.

[0050] like Figure 5 , Figure 6 and Figure 7 As shown, the two ribs 232 of the first lower plastic 23 can clamp and fix the wireless controller 6 along the second direction Y, positioning the wireless controller 6 and preventing it from moving within the assembly cavity 221. The two clips 233 can pass through the mating holes 241 of the second lower plastic 24 along the first direction Z and engage with the second lower plastic 24, simplifying the engagement between the second lower plastic 24 and the first lower plastic 23.

[0051] In some embodiments, the second lower plastic 24 includes a main body portion 242 and a fixing portion 243 connected to each other. A mating hole 241 is provided on the main body portion 242. The main body portion 242 is provided with fixing portions 243 at both ends along the third direction X. The fixing portions 243 are fixedly connected to the main body portion 231. The fixing portions 243 and the buckles 233 are spaced apart along the third direction X.

[0052] like Figure 8 and Figure 9 As shown, the mating hole 241 of the second lower plastic 24 is provided on the main body 242, which is used to provide insulation protection for the wireless controller 6. Fixing portions 243 are respectively provided at both ends of the main body 242 along the third direction X, and the two fixing portions 243 extend along the first direction Z. The fixing portions 243 can be heat-fused to the insulating film 4, so that the insulating film 4 corresponding to the position of the buckle 233 on the first lower plastic 23 can be fixed, improving the insulation performance of the battery cell.

[0053] In other embodiments, such as Figure 5 , Figure 6 and Figure 7As shown, the fixing part 243 can be omitted on the second lower plastic 24. A fixing plate 236 is provided on the body part 231 of the first lower plastic 23. The fixing plate 236 and the buckle 233 are spaced apart along the third direction X. The fixing plate 236 is heat-fused to the insulating film 4. Both the first lower plastic 23 and the second lower plastic 24 are injection molded. Compared with providing a fixing plate 236 on the first lower plastic 23, providing a fixing part 243 on the body part 231 of the second lower plastic 24 is beneficial to ensure the strength of the mold, because the gap between the fixing plate 236 and the buckle 233 will cause the mold at this point to be slender and have weak structural strength.

[0054] In some embodiments, the battery cell further includes an explosion-proof valve 8, and the top cover plate 21 is also provided with an explosion-proof hole 213 that penetrates the top cover plate 21 along the first direction Z. The explosion-proof valve 8 is fixedly connected to the top cover plate 21 and blocks the explosion-proof hole 213. The explosion-proof hole 213 and the first mounting hole 211 are spaced apart along the second direction Y. The body portion 231 is provided with a first pressure relief hole 234 that penetrates the body portion 231 along the first direction Z, and the main body portion 242 is provided with a second pressure relief hole 244 that penetrates the main body portion 242 along the first direction Z. The explosion-proof valve 8 is disposed opposite to the first pressure relief hole 234, and the second pressure relief hole 244 is disposed opposite to the wireless controller 6 along the first direction Z.

[0055] like Figure 5 and Figure 7 As shown, the top cover plate 21 is provided with an explosion-proof hole 213 for installing the explosion-proof valve 8, which can quickly discharge the internal high-pressure gas to reduce the pressure in the event of thermal runaway of the battery cell. The explosion-proof hole 213 and the first mounting hole 211 are spaced apart along the second direction Y, which can make reasonable use of the space of the battery cell in the second direction Y and avoid excessive local openings that would reduce the strength of the top cover plate 21.

[0056] A first pressure relief hole 234 is provided on the body portion 231 of the first lower plastic 23, and a second pressure relief hole 244 is provided on the body portion 242 of the second lower plastic 24. This allows the first pressure relief hole 234, the second pressure relief hole 244, the assembly cavity 221, the explosion-proof valve 8, and the receiving cavity within the housing 1 to be interconnected and form an exhaust channel. After thermal runaway of a battery cell, high-pressure gas can be rapidly discharged through the second pressure relief hole 244, the assembly cavity 221, the first pressure relief hole 234, and the explosion-proof valve 8. In this embodiment, there are multiple first pressure relief holes 234 and second pressure relief holes 244 arranged in an array to accelerate gas emission efficiency.

[0057] In this embodiment, the second lower plastic 24, the buckle 233, and the rib 232 are respectively arranged opposite to the explosion-proof valve 8 along the first direction Z. The conventional boss structure on the first lower plastic 23 opposite to the explosion-proof valve 8 along the first direction Z is eliminated, and the second lower plastic 24 can contact and abut with the electrode assembly 3, making reasonable use of the internal space of the battery cell.

[0058] In some embodiments, the body portion 231 is further provided with a third pressure relief hole 235 that penetrates the body portion 231 along the first direction Z. Along the first direction Z, the orthographic projection of the rib plate 232 onto the body portion 231 is located between the first pressure relief hole 234 and the third pressure relief hole 235.

[0059] like Figure 5 As shown, the orthographic projection of the rib 232 onto the body portion 231 is located between the first pressure relief hole 234 and the third pressure relief hole 235. Therefore, the third pressure relief hole 235 is located outside the assembly cavity 221, increasing the exhaust volume of the exhaust channel and allowing for rapid exhaust in the event of thermal runaway of a battery cell. In this embodiment, there are multiple third pressure relief holes 235, which are spaced apart along the third direction X.

[0060] In some embodiments, the main body 242 is further provided with a weight reduction hole 245, which is spaced apart from the second pressure relief hole 244 along a third direction X.

[0061] like Figure 7 and Figure 8 As shown, a weight-reducing hole 245 is provided on the main body 242 of the second lower plastic 24. The weight-reducing hole 245 can reduce the weight of the second lower plastic 24 and also accelerate gas emission. In this embodiment, the weight-reducing hole 245 is a rectangular hole.

[0062] This utility model also provides a preferred embodiment of a battery pack, including a battery cell. The specific structure of the battery cell is the same as that of the battery cell described in any of the above embodiments, and will not be repeated here.

[0063] In summary, this utility model embodiment provides a battery cell and a battery pack. A wireless controller is installed in the assembly cavity of the insulating component and connected to the terminal assembly, thereby supplying power to the wireless controller. The wireless controller is arranged in the assembly cavity of the insulating component, located inside the battery cell. It transmits the monitored information to the outside through wireless communication, eliminating the need for wires to pass through the cover plate, thus improving the sealing performance of the battery cell. In addition, the connector of the sealing component seals the first assembly hole on the top cover plate, while the insulating seal seals the second assembly hole on the connector. The insulating seal prevents the wireless controller located in the assembly cavity from being electromagnetically shielded, ensuring the wireless transmission signal output of the wireless controller. The connector of the sealing component is fixedly connected to the top cover plate. The connector and the insulating seal can be prefabricated as a whole before being connected to the top cover plate, avoiding the impact of processing the connector on the connection between the top cover plate and the terminal assembly.

[0064] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery cell, characterized in that, The battery cell has a first direction and a second direction that are perpendicular to each other. The battery cell includes: The cover plate includes a top cover sheet and an insulating component fixedly connected to the top cover sheet. The top cover sheet is provided with a first mounting hole and a pole hole that penetrate the top cover sheet along a first direction. The first mounting hole and the pole hole are spaced apart along a second direction. The insulating component is provided with a mounting cavity. A pole assembly is disposed in the pole hole, and the pole assembly is fixedly connected to the top cover plate; A wireless controller is disposed in the assembly cavity, and the wireless controller is electrically connected to the pole assembly; A sealing assembly includes a connector and an insulating sealing portion. The connector is fixedly connected to the top cover plate and blocks the first mounting hole. The connector has a second mounting hole that penetrates the connector along the first direction. The insulating sealing portion blocks the second mounting hole.

2. The battery cell according to claim 1, characterized in that, The surface roughness of the connector is Ra1, and the surface roughness of the top cover is Ra2, satisfying the condition: Ra1 > Ra2.

3. The battery cell according to claim 1, characterized in that, The second assembly hole includes a first hole segment, a second hole segment, and a third hole segment. The second hole segment is connected between the first hole segment and the third hole segment along the first direction. The insulating sealing part fills the first hole segment, the second hole segment, and the third hole segment. The minimum hole diameter of the first hole segment is R1 mm, the maximum hole diameter of the second hole segment is R2 mm, and the minimum hole diameter of the third hole segment is R3 mm, satisfying: R1 > R2, R3 > R2.

4. The battery cell according to any one of claims 1-3, characterized in that, The insulating component includes a first lower plastic and a second lower plastic that are interlocked with each other. The first lower plastic is fixedly connected to the top cover plate, and the second lower plastic is spaced apart on the side of the first lower plastic away from the top cover plate along the first direction. The first lower plastic and the second lower plastic together form the assembly cavity.

5. The battery cell according to claim 4, characterized in that, The first lower plastic includes a body and ribs and buckles fixedly connected to the body. The second lower plastic has mating holes at both ends along the third direction, which are penetrated through the second lower plastic along the first direction. The buckles are inserted through the mating holes along the first direction and engage with the second lower plastic. The second lower plastic has ribs at both ends along the second direction. The body, buckles, ribs and the second lower plastic together form the assembly cavity. The first direction, the second direction and the third direction are perpendicular to each other.

6. The battery cell according to claim 5, characterized in that, The second lower plastic includes a main body and a fixing part connected to each other. The mating hole is provided in the main body. The fixing part is provided at both ends of the main body along the third direction. The fixing part is fixedly connected to the main body. The fixing part and the buckle are spaced apart along the third direction.

7. The battery cell according to claim 6, characterized in that, The battery cell also includes an explosion-proof valve, and the top cover plate is also provided with an explosion-proof hole that penetrates the top cover plate along the first direction. The explosion-proof valve is fixedly connected to the top cover plate and blocks the explosion-proof hole. The explosion-proof hole and the first assembly hole are spaced apart along the second direction. The main body is provided with a first pressure relief hole that penetrates the main body along the first direction, and the main body is provided with a second pressure relief hole that penetrates the main body along the first direction. The explosion-proof valve is disposed opposite to the first pressure relief hole, and the second pressure relief hole is disposed opposite to the wireless controller along the first direction.

8. The battery cell according to claim 7, characterized in that, The body portion is further provided with a third pressure relief hole that penetrates the body portion along the first direction. Along the first direction, the orthogonal projection of the rib plate onto the body portion is located between the first pressure relief hole and the third pressure relief hole.

9. The battery cell according to claim 7, characterized in that, The main body is also provided with a weight reduction hole, which is spaced apart from the second pressure relief hole along the third direction.

10. A battery pack, characterized in that, Includes the battery cell described in any one of claims 1-9.

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