Single battery, battery pack and electric equipment

Abstract

The utility model discloses a single battery, a battery pack and electric equipment, and belongs to the technical field of power batteries, the single battery comprises a shell, a pole group, a cover plate assembly and an insulating part, and the shell is provided with a first accommodating cavity; the pole group is arranged in the first accommodating cavity; the cover plate assembly comprises a cover plate body, a pole and a first plastic part, the cover plate body covers the first accommodating cavity, the cover plate body is provided with an assembly hole, the pole penetrates through the assembly hole to be connected with the pole group, the cover plate assembly is further provided with a mounting groove, the mounting groove penetrates through the side wall, away from the shell, of the cover plate body, and the mounting groove is communicated with the assembly hole; the first plastic part is embedded in the mounting groove and surrounds the periphery of the pole; the insulating part is arranged on the side, away from the pole group, of the cover plate body and connected with the cover plate body. The utility model aims to solve the technical problems of damage and poor insulation effect caused by displacement of a plastic part along the surface of a cover plate due to the conditions of collision, inclination and the like caused by external factors in the transportation process of a battery.

Description

Technical Field

[0001] The present application belongs to the technical field of power batteries, and specifically relates to a single cell, a battery pack, and an electrical device. Background Art

[0002] Currently, batteries consist of a cover, a housing, and a plastic component. The cover is mounted on the housing, and the plastic component is located on the side of the cover facing away from the housing, with the plastic component in contact with the cover. During transportation, batteries can be subject to collisions, tilting, and other external factors, which can cause the plastic component to shift along the surface of the cover. This can not only cause damage, but also misalign the plastic component with the cover, affecting insulation performance and hindering subsequent assembly and use. Utility Model Content

[0003] An embodiment of the present application provides a single cell battery, aiming to overcome the technical problem that during transportation, the battery may collide, tilt, etc. due to external factors, which may cause the plastic parts to shift along the surface of the cover, resulting in damage and poor insulation effect; another purpose of the embodiment of the present application is to provide a battery pack; another purpose of the embodiment of the present application is to provide an electrical device.

[0004] An embodiment of the present application provides a single battery, comprising:

[0005] A housing having a first accommodating cavity;

[0006] an electrode group, the electrode group being disposed in the first accommodating cavity;

[0007] A cover assembly, comprising a cover body, a pole, and a first plastic part. The cover body seals the first accommodating cavity and is connected to the housing. The cover body is provided with an assembly hole. The pole is passed through the assembly hole and connected to the pole group. The cover assembly further comprises a mounting groove, which is provided on a side wall of the cover body facing away from the housing. The mounting groove is connected to the assembly hole. The first plastic part is embedded in the mounting groove and surrounds the pole.

[0008] An insulating member is provided on a side of the cover plate body away from the pole group and is connected to the cover plate body.

[0009] In some embodiments, the first plastic part includes:

[0010] A pole insulating portion is embedded in the mounting groove and surrounds the pole;

[0011] A skirt insulating portion, embedded in the mounting groove and connected to the circumferential outer edge of the pole insulating portion;

[0012] The side wall insulating portion is connected to the pole insulating portion and forms a second accommodating cavity with the pole insulating portion for the pole to pass through.

[0013] In some embodiments, the insulating member comprises:

[0014] a main body portion, covering at least a portion of the cover plate body;

[0015] a fitting portion connected to a side of the main body away from the cover body and covering a side wall of the skirt insulating portion;

[0016] The folding portion is connected to a side of the fitting portion away from the main body portion and covers a top wall of the skirt insulating portion facing away from the cover plate body.

[0017] In some embodiments, the cover plate assembly includes a pole terminal, which is riveted to the pole and connected to the first plastic part.

[0018] In some embodiments, the single battery further includes an explosion-proof valve, which is connected to the housing and passes through the cover body;

[0019] The main body also has an explosion-proof valve hole, and the explosion-proof valve is passed through the explosion-proof valve hole.

[0020] In some embodiments, the main body has an outer edge, and the distance between the outer edge and the outer edge of the cover body is L, satisfying 0mm≤L≤1mm.

[0021] In some embodiments, the folded portion has an inner edge, and the distance between the inner edge and the inner wall of the fitting portion is H, satisfying H≥0.5mm.

[0022] In some embodiments, the thickness of the insulating member is N, satisfying 0.1 mm ≤ N ≤ 0.5 mm.

[0023] An embodiment of the present application further discloses a battery pack, comprising the single cell battery described in the above embodiment.

[0024] The embodiments of the present application further disclose an electrical device, comprising the single cell battery described in the above embodiments, or comprising the battery pack described in the above embodiments.

[0025] The various embodiments of the present application have one of the following beneficial effects:

[0026] A single cell battery according to an embodiment of the present application includes a shell, a pole group, a cover assembly, and an insulating member, wherein the shell has a first accommodating cavity; the pole group is arranged in the first accommodating cavity; the cover assembly includes a cover body, a pole and a first plastic member, the cover body covers the first accommodating cavity, the cover body is provided with an assembly hole, the pole is passed through the assembly hole and connected to the pole group, the cover assembly also has a mounting groove, the mounting groove is provided on the side wall of the cover body away from the shell, the mounting groove is connected to the assembly hole, the first plastic member is embedded in the mounting groove and surrounded by the pole; the insulating member is arranged on the side of the cover body away from the pole group and connected to the cover body. This application aims to solve the technical problem that during transportation of batteries, due to external factors, collisions, tilting, etc. may occur, which may cause displacement of plastic members along the surface of the cover, resulting in damage and poor insulation effect.

[0027] The battery pack of the embodiment of the present application includes the single battery as described in the above embodiment, and thus can have all the technical features and technical effects of the above single battery, which will not be described in detail here.

[0028] The electrical device of the embodiment of the present application includes the single cell or the battery pack as described in the above embodiment, and thus can have all the technical features and technical effects of the single cell or battery pack described above, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic cross-sectional view of a single cell in the prior art provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of the explosion structure of a single cell provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the overall structure of the cover plate assembly and the insulating member provided in an embodiment of the present application;

[0033] Figure 4 Provided in the embodiments of this application Figure 2 Cross-sectional structure diagram of AA;

[0034] Figure 5 A schematic diagram of the overall structure of the cover assembly provided in an embodiment of the present application;

[0035] Figure 6 Provided in the embodiments of this application Figure 5 Partial detail diagram at point C in the middle;

[0036] Figure 7 Schematic diagram of various spacings provided in the embodiments of this application;

[0037] Reference numerals:

[0038] 1-Plastic parts; 2-Cover plate;

[0039] 10-housing; 11-first accommodating chamber;

[0040] 20-pole group;

[0041] 30 - cover assembly; 31 - cover body; 311 - assembly hole; 312 - mounting slot; 32 - pole; 33 - first plastic part; 331 - pole insulation portion; 332 - skirt insulation portion; 333 - sidewall insulation portion; 334 - second accommodating cavity; 34 - pole terminal; 35 - second plastic part;

[0042] 40 - Insulation member; 41 - Main body; 411 - Explosion-proof valve hole; 412 - Outer edge; 42 - Fitting portion; 43 - Folding portion; 431 - Inner edge;

[0043] 50-Explosion-proof valve. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0045] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In the description of this application, unless otherwise specified, "plurality" refers to two or more. "and / or" describes an association relationship between associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0046] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes in the drawings are not necessarily required to implement the present application and therefore cannot be used to limit the scope of protection of the present application.

[0047] As the preamble to the embodiments of the present application, a single cell generally includes: a cover plate 2 (integrated with poles, explosion-proof valves, injection holes, etc.), a shell, a pole group, an electrolyte, an insulating member, etc. After the cover plate and the shell are welded, a closed space with a certain mechanical strength is formed to protect the pole group. The plastic part and the lower plastic are arranged on the cover plate, and the plastic part is arranged on the side of the cover plate away from the shell, and the plastic part is in contact with the cover plate, and the lower plastic can fix and support the pole group; the lower plastic is used to achieve insulation and fixation of the pole group, and the lower plastic is generally made of polypropylene. The explosion-proof valve structure is mainly used for the directional discharge of internal high-temperature and high-pressure gas when the battery has thermal runaway due to an internal short circuit, thereby improving the safety performance of the battery. The insulating member covers the side of the cover plate away from the shell, and plays the role of insulation and protection.

[0048] See also Figure 1 , Figure 1The cross-sectional structure diagram of a single cell in the prior art provided in the embodiment of the present application. During transportation, the battery may be subject to collision, tilting, and other conditions due to external factors, which may cause the plastic part 1 to be displaced along the surface of the cover plate 2. This is not only prone to damage, but also the relative position between the plastic part 1 and the cover plate 2 is not in an adapted position, affecting the insulation effect, and is also not conducive to later assembly and use. In addition, due to the manufacturing tolerance of the insulating part and the fitting tolerance of the production line equipment, a gap M exists between the insulating part and the plastic part 1, resulting in the possibility of electrical connection between the pole and the cover plate or the shell. The electrical connection between the pole and the cover plate or the shell will cause a short circuit failure of the entire battery, resulting in a serious accident.

[0049] In view of this, an embodiment of the present application provides a single cell battery, aiming to solve at least part of the above technical problems.

[0050] See also Figure 2 、 Figure 3 and Figure 4 , Figure 2 This is a schematic diagram of the explosion structure of a single battery provided in an embodiment of the present application. Figure 3 A schematic diagram of the overall structure of the cover plate assembly and the insulating member provided in an embodiment of the present application; Figure 4 Provided in the embodiments of this application Figure 3 A cross-sectional structural diagram of section AA in the middle. A single cell battery in an embodiment of the present application includes a housing 10, a pole group 20, a cover assembly 30, and an insulating member 40. The housing 10 has a first accommodating cavity 11. The pole group 20 is disposed in the first accommodating cavity 11. The cover assembly 30 includes a cover body 31, a pole 32, and a first plastic member 33. The cover body 31 covers the first accommodating cavity 11 and is connected to the housing 10. The cover body 31 has an assembly hole 311. The pole 32 is passed through the assembly hole 311 and connected to the pole group 20. The cover assembly 30 also has a mounting groove 312. The mounting groove 312 passes through the side wall of the cover body 31 facing away from the housing 10. The mounting groove 312 is connected to the assembly hole 311. The first plastic member 33 is embedded in the mounting groove 312 and surrounds the pole 32. The insulating member 40 is disposed on the side of the cover body 31 facing away from the pole group 20 and is connected to the cover body 31.

[0051] It should be understood that in order to better illustrate the structure of the single cell, Figure 2Only a portion of the middle shell 10 is shown. The cover body 31 can be made of a plain aluminum plate material. The cover body 31 and the shell 10 can be fixedly connected by welding. After the cover body 31 and the shell 10 are welded, a first accommodating cavity 11 with a certain mechanical strength, which is a closed space for protecting the electrode group 20, is formed. The insulating member 40 is made of PC (polycarbonate) material. PC material has good electrical insulation properties and can effectively isolate the electrical connection between the pole 32 and the cover body 31 or the shell 10. This can prevent the current from short-circuiting on a path where it should not flow, ensuring the normal operation and safety of the battery. PC material has high mechanical strength and rigidity, and can provide protection for the pole 32 and other battery components. It can withstand a certain amount of pressure and impact, and prevent external objects from damaging the components inside the battery.

[0052] In light of this, this embodiment employs a first plastic component 33 embedded within the mounting groove 312 and surrounding the pole 32. This structural design ensures accurate positioning of the first plastic component 33 during installation and effectively prevents displacement along the surface of the cover body 31 during transport, thereby improving insulation performance. The pole 32 is connected to the pole group 20 through the assembly hole 311 provided in the cover body 31. This connection ensures a proper fit between the pole 32 and the cover body 31, preventing degradation of insulation performance and facilitating subsequent assembly and operation.

[0053] In some embodiments, as Figure 3 and Figure 4 As shown, the first plastic part 33 includes a pole insulating portion 331, a skirt insulating portion 332, and a sidewall insulating portion 333. The pole insulating portion 331 is embedded in the mounting groove 312 and surrounds the pole 32. The skirt insulating portion 332 is embedded in the mounting groove 312 and connected to the circumferential outer edge of the pole insulating portion 331. The sidewall insulating portion 333 is connected to the pole insulating portion 331 and, together with the pole insulating portion 331, forms a second accommodating cavity 334 for the pole 32 to pass through. It should be noted that the pole insulating portion 331, the skirt insulating portion 332, and the sidewall insulating portion 333 can be an integrated structure for easy installation and structural stability. The pole insulating portion 331 is embedded in the mounting groove 312 and surrounds the pole 32, insulating the pole 32 and preventing electrical connection between the pole 32 and the cover body 31 or the housing 10. The skirt insulation portion 332 is embedded in the mounting groove 312 and connected to the outer circumferential edge of the pole insulation portion 331. The provision of the skirt insulation portion 332 increases the contact area between the first plastic component 33 and the cover body 31, thereby improving the insulation effect. The side wall insulation portion 333 is connected to the pole insulation portion 331 and encloses a second accommodating cavity 334 for the pole 32 to pass through. The presence of the side wall insulation portion 333 further enhances the insulation performance of the pole 32 while also providing more stable support for the pole 32.

[0054] Therefore, the integrated structure design of the pole insulation part 331, the skirt insulation part 332, and the side wall insulation part 333 can facilitate installation and maintain structural stability. The skirt insulation part 332 can increase the contact area between the first plastic part 33 and the cover body 31, and the insulation effect is better. At the same time, the first plastic part 33 is embedded in the installation groove 312 for a longer part, and the relative position between the first plastic part 33 and the cover body 31 is more stable during battery transportation.

[0055] In some embodiments, as shown in Figure 3 and Figure 4 The insulation piece 40 includes a body part 41, a fitting part 42, and a folded part 43. The body part 41 covers at least part of the cover body 31. The fitting part 42 is connected to the side of the body part 41 away from the cover body 31 and covers the side wall of the skirt insulation part 332. The folded part 43 is connected to the side of the fitting part 42 away from the body part 41 and covers the top wall of the skirt insulation part 332 facing away from the cover body 31.

[0056] It should be understood that the cooperation of the body part 41, the fitting part 42, and the folded part 43 not only avoids the existence of a gap M between the insulation piece 40 and the pole 32, but also avoids the formation of an electrical connection between the pole 32 and the cover body 31 or the shell 10, thereby preventing the formation of an electrical connection between the pole 32 and the cover body 31 or the shell 10, which can cause short-circuit failure of the entire battery and cause serious accidents. That is, the present embodiment covers at least part of the cover body 31 and the skirt insulation part 332 with the insulation piece 40 to ensure that there is no gap M between the insulation piece 40 and the first plastic part 33, preventing the formation of an electrical connection between the pole 32 and the cover body 31 or the shell 10, which can cause short-circuit failure of the entire battery and cause serious accidents. The side of the insulation piece 40 facing the pole group 20 is provided with an adhesive layer, and the insulation piece 40 is adhered to part of the cover body 31 and part of the skirt insulation part 332 through the adhesive layer. The adhesive layer is usually made of adhesive or glue and the like. The adhesive layer firmly fixes the insulation piece 40 to the cover body 31 and the skirt insulation part 332, preventing it from loosening or falling off during use. This can ensure the stability of the position of the insulation piece 40 and prevent it from moving due to vibration or external force, thereby ensuring the normal operation and safety of the battery. The adhesive layer itself has certain insulation performance, which can further enhance the electrical insulation capability of the insulation piece 40. It can prevent current leakage between the insulation piece 40 and other battery components, ensuring the safety and reliability of the battery.

[0057] In some embodiments, as shown in Figure 4As shown, the cover plate assembly 30 further comprises a second plastic piece 35, which is arranged between the pole group 20 and the cover plate body 31. The second plastic piece 35 can fix and support the pole group 20, and is used to realize the insulation and fixation of the pole group 20. It should be noted that the second plastic piece 35 is made of insulating material, generally polypropylene. Fixing and supporting the pole group 20, the existence of the second plastic piece 35 can stably fix and support the pole group 20, preventing the pole group 20 from loosening or shifting during use. This helps to keep the relative positions of the components inside the battery stable, improving the reliability and safety of the battery. Realizing the insulation of the pole group 20, the second plastic piece 35 as an insulating material effectively isolates the electrical connection between the pole group 20 and the cover plate body 31. This can prevent the pole group 20 from being electrically connected to the cover plate body 31, avoiding short circuit and other battery failures. Realizing the fixation of the pole group 20, the second plastic piece 35 ensures the stability of the pole group 20 through its fixation function. It can prevent the pole group 20 from loosening or shifting during the use of the battery, thereby maintaining the normal operation and performance of the battery.

[0058] In some embodiments, as shown in Figure 4 , the cover plate assembly 30 further comprises a second plastic piece 35, which is arranged between the pole group 20 and the cover plate body 31. The second plastic piece 35 can fix and support the pole group 20, and is used to realize the insulation and fixation of the pole group 20. It should be noted that the second plastic piece 35 is made of insulating material, generally polypropylene. Fixing and supporting the pole group 20, the existence of the second plastic piece 35 can stably fix and support the pole group 20, preventing the pole group 20 from loosening or shifting during use. This helps to keep the relative positions of the components inside the battery stable, improving the reliability and safety of the battery. Realizing the insulation of the pole group 20, the second plastic piece 35 as an insulating material effectively isolates the electrical connection between the pole group 20 and the cover plate body 31. This can prevent the pole group 20 from being electrically connected to the cover plate body 31, avoiding short circuit and other battery failures. Realizing the fixation of the pole group 20, the second plastic piece 35 ensures the stability of the pole group 20 through its fixation function. It can prevent the pole group 20 from loosening or shifting during the use of the battery, thereby maintaining the normal operation and performance of the battery.

[0059] In some embodiments, please refer to Figure 1 , Figure 5 and Figure 6 , Figure 5 the overall structure of the cover plate assembly provided by the embodiments of the present application, Figure 6 the overall structure of the cover plate assembly provided by the embodiments of the present application, Figure 5A detailed view of the battery at point C in the middle. The battery cell also includes an explosion-proof valve 50, which is connected to the housing 10. The main body 41 of the insulating member 40 also has an explosion-proof valve hole 411, through which the explosion-proof valve 50 is inserted. These features are designed to improve battery safety, particularly when the battery experiences thermal runaway due to an internal short circuit. It should be understood that the explosion-proof valve 50 is a safety device primarily used to discharge high-temperature, high-pressure gases generated within the battery due to thermal runaway. Abnormal conditions within the battery, such as overcharge, overdischarge, or a short circuit, can cause the internal battery temperature to rise, generating large amounts of gas. If these gases cannot be discharged in a timely manner, the internal battery pressure can rise and even cause an explosion. To address this issue, the main body 41 of the insulating member 40 is designed with an explosion-proof valve hole 411, through which the explosion-proof valve 50 is inserted, connecting the explosion-proof valve 50 to the interior of the battery. When internal battery pressure rises, the explosion-proof valve 50 opens, discharging the high-temperature, high-pressure gases in a targeted manner, thereby reducing internal battery pressure and minimizing the risk of explosion. In addition, the connection between the explosion-proof valve 50 and the housing 10 also plays a role of fixing and sealing, ensuring the normal operation of the explosion-proof valve 50 and preventing gas leakage.

[0060] In light of this, the introduction of the explosion-proof valve 50 and its coordinated design with the insulating element 40 effectively improve the safety performance of the single battery. The presence of the explosion-proof valve 50 allows for the timely discharge of high-temperature, high-pressure gases within the battery, preventing battery explosion. Furthermore, the connection between the explosion-proof valve 50 and the housing 10 ensures the valve's stability and sealing, guaranteeing the proper operation and safety of the battery. These structural designs ensure safer and more reliable operation of the single battery under abnormal conditions.

[0061] In some embodiments, see Figure 7 , Figure 7 Schematic diagram of various spacings provided for the embodiments of the present application. The main body 41 has an outer edge 412, and the distance between the outer edge 412 and the outer edge of the cover body 31 is L, satisfying 0mm≤L≤1mm. The design parameters of the spacing L are based on the actual use environment. When there is no need to cooperate with other structures, the spacing L can be 0mm, that is, the main body 41 completely covers the cover body 31. When it is necessary to cooperate with other structures, the spacing L can be 0mm<L≤1mm, that is, some space is reserved for the arrangement and installation of other structures. By adjusting the size of L, it can ensure that the insulating part 40 is well matched with other structures, thereby improving the overall performance and safety of the battery.

[0062] In some embodiments, as Figure 7As shown, the folded portion 43 has an inner edge 431, and the distance between the inner edge 431 and the inner wall of the fitting portion 42 is H, satisfying H ≥ 0.5 mm. It should be understood that the distance H only needs to satisfy the basic coverage area. The size of the distance H satisfies H ≥ 0.5 mm to ensure sufficient coverage area. By setting an appropriate distance H, it can be ensured that the insulating member 40 has sufficient coverage area when covering the top wall of the skirt insulating portion 332 facing away from the cover body 31, thereby effectively preventing the formation of an electrical connection between the pole 32 and the cover body 31 or the housing 10, avoiding short circuit failure and accidents.

[0063] In some embodiments, as Figure 7 As shown, the thickness of the insulating member 40 is N, satisfying 0.1 mm ≤ N ≤ 0.5 mm. A design within this range can provide sufficient electrical insulation and mechanical strength. The appropriate thickness ensures that the insulating member 40 effectively isolates the electrical connection between the pole 32 and the cover body 31 or housing 10, while providing adequate protection and support.

[0064] The present application also discloses a battery pack including the single cell battery of the above embodiment, and thus can have all the technical features and effects of the above single cell battery, which will not be described in detail here.

[0065] The present application also discloses an electrical device including a single cell battery or a battery pack according to the above embodiment, and thus can have all the technical features and effects of the single cell battery or battery pack, which will not be described in detail here.

[0066] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0067] The sealing cover provided in the embodiments of the present application is introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single battery, characterized in that: include: A housing (10), wherein the housing (10) has a first accommodating cavity (11); a pole group (20), the pole group (20) being arranged in the first accommodating cavity (11); A cover plate assembly (30), the cover plate assembly (30) comprising a cover plate body (31), a pole (32) and a first plastic part (33), the cover plate body (31) covers the first accommodating cavity (11) and is connected to the housing (10), the cover plate body (31) is provided with an assembly hole (311), the pole (32) is passed through the assembly hole (311) and is electrically connected to the pole group (20), the cover plate assembly (30) further comprises a mounting groove (312), the mounting groove (312) is provided on a side wall of the cover plate body (31) facing away from the housing (10), the mounting groove (312) is communicated with the assembly hole (311), and the first plastic part (33) is embedded in the mounting groove (312) and is arranged around the pole (32); An insulating member (40) is provided on a side of the cover plate body (31) facing away from the pole group (20) and is connected to the cover plate body (31).

2. The single cell according to claim 1, wherein: The first plastic part (33) comprises: A pole insulating portion (331) is embedded in the mounting groove (312) and surrounds the pole (32); A skirt insulating portion (332) is embedded in the mounting groove (312) and connected to the circumferential outer edge of the pole insulating portion (331); The side wall insulating portion (333) is connected to the pole insulating portion (331) and forms a second accommodating cavity (334) with the pole insulating portion (331) for the pole (32) to pass through.

3. The single cell according to claim 2, wherein: The insulating member (40) comprises: a main body portion (41) covering at least a portion of the cover plate body (31); a fitting portion (42) connected to a side of the main body portion (41) away from the cover plate body (31) and covering a side wall of the skirt insulating portion (332); The folding portion (43) is connected to the side of the fitting portion (42) away from the main body portion (41) and covers the top wall of the skirt insulating portion (332) facing away from the cover plate body (31).

4. The single cell according to any one of claims 1 to 3, characterized in that: The cover plate assembly (30) includes a pole terminal (34), the pole terminal (34) is riveted to the pole (32), and is connected to the first plastic part (33).

5. The single cell according to claim 3, wherein: The single cell further includes an explosion-proof valve (50), which is connected to the housing (10) and passes through the cover plate body (31); The main body (41) further has an explosion-proof valve hole (411), and the explosion-proof valve (50) is passed through the explosion-proof valve hole (411).

6. The single cell according to claim 3, wherein: The main body (41) has an outer edge (412), and the distance between the outer edge (412) and the outer edge of the cover body (31) is L, which satisfies 0mm≤L≤1mm.

7. The single cell according to claim 3, wherein: The folding portion (43) has an inner edge (431), and the distance between the inner edge (431) and the inner wall of the fitting portion (42) is H, satisfying H≥0.5mm.

8. The single cell according to claim 1, wherein: The thickness of the insulating member (40) is N, which satisfies 0.1 mm ≤ N ≤ 0.5 mm.

9. A battery pack, characterized in that: The method comprises the single cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: The method comprises a single cell according to any one of claims 1 to 8, or a battery pack according to claim 9.

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