Single battery, battery pack and electric equipment

Abstract

The invention discloses a single battery, a battery pack and electric equipment, and belongs to the technical field of power batteries, the single battery comprises a cover plate assembly and a sealing ring, the cover plate assembly comprises a cover plate body, a first pole and a second pole, and the cover plate body is provided with a first assembly hole; the first pole is arranged on one side of the cover plate body and partially penetrates through the first assembly hole; the second pole comprises a first matching layer, a second matching layer, a third matching layer and fourth matching layers which are sequentially arranged in a step shape in the thickness direction of the cover plate body, the first matching layer penetrates through the first assembly hole and is connected with the first pole, and the fourth matching layers are arranged on the two sides, in the width direction of the cover plate body, of the third matching layer and are connected with the third matching layer. And the sealing ring is arranged at the joint of the first pole and the second pole. The distance between the end face of the side, away from the electrode assembly, of the second matching layer and the end face of the side, facing the electrode assembly, of the cover plate body is H, and H is larger than or equal to 0.5 mm and smaller than or equal to 1.5 mm. The existence of the spacing H in the embodiment can prevent the first pole from rotating.

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] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The structural parts of lithium-ion batteries are also an important part of lithium-ion power batteries. They not only provide protection for lithium-ion batteries in terms of safety and reliability, but also take into account the connection between the internal chemical system of lithium-ion batteries and external modules and even the Pack; since there are various connection relationships inside the structural parts and the requirements of sealing performance and overcurrent performance need to be taken into account, the design of the structural parts is particularly important.

[0003] The battery electrode structure is generally a riveted connection between the shell and the pole, and then welded to the connecting piece, which has low performance and yield. In addition, the traditional riveting solution seriously affects the stability of the explosion-proof valve due to the instantaneous impact during riveting. In addition, due to the existence of the riveting block, the axial space is seriously occupied, and the space utilization rate is low. Summary of the invention

[0004] An embodiment of the present application provides a single cell battery, aiming to improve the performance and yield rate of the electrode structure; another object of the embodiment of the present application is to provide a battery pack; another object of the embodiment of the present application is to provide an electrical device.

[0005] An embodiment of the present application provides a single battery, comprising:

[0006] A housing having a receiving cavity;

[0007] An electrode assembly is disposed in the accommodating cavity;

[0008] A cover plate assembly, comprising a cover plate body, a first pole, and a second pole, wherein the cover plate body seals the accommodating cavity and is connected to the shell, and the cover plate body has a first assembly hole; the first pole is arranged on a side of the cover plate body away from the electrode assembly, and the first assembly hole is partially penetrated; the second pole is located in the accommodating cavity, and the second pole comprises a first matching layer, a second matching layer, a third matching layer, and a fourth matching layer which are sequentially arranged in a step-like manner along the thickness direction of the cover plate body, the first matching layer penetrates the first assembly hole and is connected to the first pole, the fourth matching layer is arranged on both sides of the third matching layer along the width direction of the cover plate body and is connected to the third matching layer, and the electrode assembly is connected to a side of the fourth matching layer away from the first pole;

[0009] A sealing ring, arranged at the connection between the first pole and the second pole, and abutting against the cover plate body;

[0010] The distance between the end surface of the second matching layer facing away from the electrode assembly and the end surface of the cover plate body facing the electrode assembly is H mm, satisfying 0.5 mm ≤ H ≤ 1.5 mm.

[0011] In some embodiments, the first pole comprises:

[0012] A first pole body, disposed on a side of the cover body away from the electrode assembly;

[0013] A convex block is arranged on a side of the first pole body facing the electrode assembly, connected to the first pole body, and partially penetrated through the first assembly hole;

[0014] The second pole has a second assembly hole, which passes through the first matching layer, the second matching layer, and the third matching layer in sequence along the thickness direction of the cover plate body, and part of the protrusions penetrate the second assembly hole and are connected to the inner wall of the first matching layer.

[0015] In some embodiments, the sealing ring comprises:

[0016] A first sealing layer is provided at the connection between the first pole and the second pole, wherein the inner wall of the first sealing layer abuts against the outer wall of the first matching layer, and the outer wall of the first sealing layer abuts against the inner wall of the cover body;

[0017] A connecting portion is arranged along the thickness direction of the cover body, one end of the connecting portion is connected to the first sealing layer, a side of the connecting portion facing the second pole is in contact with the outer wall of the second matching layer, and a side of the connecting portion facing away from the second pole is in contact with the inner wall of the cover body;

[0018] The second sealing layer is connected to the other end of the connecting portion, the inner wall of the second sealing layer abuts against the outer wall of the second matching layer, and the end surface of the second sealing layer facing the first pole abuts against the side of the cover plate body facing the electrode assembly.

[0019] In some embodiments, in the thickness direction of the cover plate body, the height of the first matching layer is T 1 mm, the height of the second matching layer is T 2 mm, the height of the third matching layer is T 3 mm, satisfying 1.2mm≤T 1 =T 2 =T 3 ≤2.0mm;

[0020] The height of the fourth matching layer is T 4 mm, satisfying 0.5mm≤T4 ≤1.2mm.

[0021] In some embodiments, in the thickness direction of the cover plate body, the height between the end surface of the second matching layer facing the first pole and the end surface of the first matching layer facing the first pole is H 1 mm, the height between the end surface of the third matching layer facing the first pole and the end surface of the cover plate body facing the electrode assembly is H 2 mm, satisfying 0.5mm≤H 1 =H 2 ≤1.2mm.

[0022] In some embodiments, in the width direction of the cover plate body, the distance between the inner wall and the outer wall of the first matching layer is W 1 mm, satisfying 2.5mm≤W 1 ≤4.8mm;

[0023] The distance between the outer wall of the second matching layer and the outer wall of the first matching layer is W 2 mm, satisfying 0.8mm≤W 2 ≤1.6mm;

[0024] The distance between the outer wall of the third matching layer and the outer wall of the second matching layer is W 3 mm, satisfying 0.8mm≤W 3 ≤2.0mm.

[0025] In some embodiments, the first pole and the second pole are both stamped one-time formed structures.

[0026] In some embodiments, the electrode assembly comprises:

[0027] An electrode body, disposed in the accommodating cavity and connected to the second pole;

[0028] A pole ear, one end of which is connected to the electrode body, and the other end of which is connected to a side of the fourth matching layer away from the second pole.

[0029] The embodiment of the present application also discloses a battery pack, comprising the single cell battery as described in the above embodiment.

[0030] The embodiments of the present application also disclose an electrical device, including the single cell battery described in the above embodiments, or including the battery pack described in the above embodiments.

[0031] The embodiments of the present application have one of the following beneficial effects:

[0032] A single cell battery according to an embodiment of the present application comprises a shell, an electrode assembly, a cover assembly and a sealing ring, wherein the shell has a accommodating cavity; the electrode assembly is arranged in the accommodating cavity, the cover assembly comprises a cover body, a first pole, and a second pole, the cover body seals the accommodating cavity and is connected to the shell, and the cover body has a first assembly hole; the first pole is arranged on the side of the cover body away from the electrode assembly and is partially penetrated by the first assembly hole; the second pole is located in the accommodating cavity, the second pole comprises a first matching layer, a second matching layer, a third matching layer and a fourth matching layer which are arranged in sequence in a step-like manner along the thickness direction of the cover body, the first matching layer is penetrated by the first assembly hole and connected to the first pole, the fourth matching layer is arranged on both sides of the third matching layer along the width direction of the cover body and is connected to the third matching layer, and the electrode assembly is connected to the side of the fourth matching layer away from the first pole. The sealing ring is arranged at the connection between the first pole and the second pole, and abuts against the cover body; the spacing between the end face of the second matching layer facing away from the electrode assembly and the end face of the cover body facing the electrode assembly is Hmm, satisfying 0.5mm≤H≤1.5mm; this embodiment cancels the assembly of the second pole with the riveted part, and the second pole replaces part of the existing pole. At the same time, through the connection between the second pole and the first pole and the connection between the second pole and the pole ear, the electrode assembly and the first pole can be electrically connected, which reduces the occupation of the axial space of the single cell battery and improves the space utilization rate of the single cell battery. The existence of the spacing H indicates that part of the second matching layer is partially arranged in the first assembly hole, combined with the first pole, the cover body and the second pole to squeeze the sealing ring, thereby preventing the first pole from rotating.

[0033] 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.

[0034] The electric 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, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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.

[0036] Figure 1 A cross-sectional view of a single cell provided in an embodiment of the present application at one angle;

[0037] Figure 2A cross-sectional view of a single cell provided in an embodiment of the present application from another angle;

[0038] Figure 3 A schematic diagram of the structure of a first pole provided in an embodiment of the present application;

[0039] Figure 4 A schematic diagram of the structure of the sealing ring provided in the embodiment of the present application;

[0040] Figure 5 A schematic diagram of parameters of each matching layer in the thickness direction provided in an embodiment of the present application;

[0041] Figure 6 A schematic diagram of parameters of a sealing ring in the thickness direction provided in an embodiment of the present application;

[0042] Figure 7 A schematic diagram of various parameters in the width direction provided for an embodiment of the present application;

[0043] Figure 8 A diagram showing the positional relationship between the electrode assembly and the second pole provided in an embodiment of the present application.

[0044] Description of reference numerals:

[0045] 10-housing; 11-accommodating chamber;

[0046] 20-electrode assembly; 21-electrode body; 22-electrode ear;

[0047] 30-cover plate assembly; 31-cover plate body; 311-first assembly hole; 32-first pole; 321-first pole body; 322-bump; 33-second pole; 331-first matching layer; 332-second matching layer; 333-third matching layer; 334-fourth matching layer; 335-second assembly hole;

[0048] 40-seal ring; 41-first seal layer; 42-connecting portion; 43-second seal layer;

[0049] 50-Plastic. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are an "or" relationship. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] Those skilled in the art will appreciate that the drawings are only schematic diagrams of example 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.

[0053] As the preamble of the embodiments of this application, with the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The structural parts of lithium-ion batteries are also an important part of lithium-ion power batteries. They not only provide protection for lithium-ion batteries in terms of safety and reliability, but also take into account the connection between the internal chemical system of lithium-ion batteries and external modules and even the Pack; since there are various connection relationships inside the structural parts and the requirements of sealing performance and overcurrent performance need to be taken into account, the design of the structural parts is particularly important.

[0054] The battery electrode structure is generally a riveted connection between the shell and the pole, and then welded to the connecting piece, which has low performance and yield. In addition, the traditional riveting solution seriously affects the stability of the explosion-proof valve due to the instantaneous impact during riveting. In addition, due to the existence of the riveting block, the axial space is seriously occupied, and the space utilization rate is low.

[0055] 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.

[0056] See also Figure 1 , Figure 2 and Figure 8 , Figure 1 A cross-sectional view of a single cell provided in an embodiment of the present application at one angle, Figure 2A cross-sectional view of a single cell provided in an embodiment of the present application from another angle, Figure 8 A single cell in the embodiment of the present application comprises a housing 10, an electrode assembly 20, a cover assembly 30 and a sealing ring 40, wherein the housing 10 has a receiving cavity 11; the electrode assembly 20 is disposed in the receiving cavity 11. The cover plate assembly 30 includes a cover plate body 31, a first pole 32, and a second pole 33. The cover plate body 31 covers the accommodating cavity 11 and is connected to the shell 10. The cover plate body 31 has a first assembly hole 311. The first pole 32 is arranged on the side of the cover plate body 31 away from the electrode assembly 20, and the first assembly hole 311 is partially penetrated. The second pole 33 is located in the accommodating cavity 11. The second pole 33 includes a first matching layer 331, a second matching layer 332, a third matching layer 333 and a fourth matching layer 334 which are arranged in a step-like manner in the thickness direction of the cover plate body 31. The first matching layer 331 penetrates the first assembly hole 311 and is connected to the first pole 32. The fourth matching layer 334 is arranged on both sides of the third matching layer 333 along the width direction of the cover plate body 31 and is connected to the third matching layer 333. The electrode assembly 20 is connected to the side of the fourth matching layer 334 away from the first pole 32. The sealing ring 40 is disposed at the connection between the first pole 32 and the second pole 33 and abuts against the cover body 31. The distance between the end face of the second matching layer 332 facing away from the electrode assembly 20 and the end face of the cover body 31 facing the electrode assembly 20 is H mm, satisfying 0.5 mm ≤ H ≤ 1.5 mm.

[0057] It should be noted that the shell 10 and the accommodating cavity 11 provide the overall structure and protection of the battery, accommodate the electrode assembly 20, and are connected to the cover assembly 30 to form a sealed battery shell. The electrode assembly 20 includes an electrode body 21 and a pole ear 22, which is responsible for the electrochemical reaction of the battery. The electrode body 21 is located in the accommodating cavity 11 and is connected to the second pole 33; the pole ear 22 connects the electrode body 21 and the fourth matching layer 334 to ensure current conduction. The cover assembly 30 includes a cover body 31, a first pole 32, and a second pole 33, which closes the accommodating cavity 11 and provides a current output interface. The cover body 31 is connected to the first pole 32 through the first assembly hole 311, and the multi-layer matching structure of the second pole 33 (the first matching layer 331, the second matching layer 332, the third matching layer 333 and the fourth matching layer 334) ensures a stable connection with the electrode assembly 20. The sealing ring 40 provides sealing to prevent electrolyte leakage and ensure the safety of the battery. The sealing ring 40 is arranged at the connection between the first pole 32 and the second pole 33, and abuts against the cover body 31 to ensure sealing performance. The first pole 32 is a copper-aluminum composite pole piece, which provides good electrothermal performance, corrosion resistance, wear resistance and plasticity, and is connected to the cover body 31 and the second pole 33 to ensure efficient current conduction and safety. The multi-layer matching structure of the second pole 33 provides stable mechanical and electrical connections through the stepped first matching layer 331, the second matching layer 332, the third matching layer 333 and the fourth matching layer 334. The first matching layer 331 is connected to the first pole 32, and the fourth matching layer 334 is connected to the electrode assembly 20 to ensure structural stability and current conduction efficiency.

[0058] It should be noted that the peripheral shape of the first matching layer 331 can be circular, square or other shapes, the peripheral shape of the second matching layer 332 can be circular, square or other shapes, and the peripheral shape of the third matching layer 333 can be circular, square or other shapes. The peripheral shape of the first matching layer 331, the peripheral shape of the second matching layer 332, and the peripheral shape of the third matching layer 333 do not need to be consistent, that is, the peripheral shapes of the three can be the same or different or any two of them can be the same. The peripheral shapes of the first matching layer 331, the second matching layer 332, and the third matching layer 333 are not specifically limited here. The spacing H can be any value among 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, or a range value between any two values.

[0059] In view of this, this embodiment reduces the occupation of the axial space of the single battery by eliminating the traditional riveting parts and adopting the design of the second pole 33. This design not only improves the space utilization, but also provides more design space for other functional components of the battery. The connection between the second pole 33 and the first pole 32, and the connection between the second pole 33 and the electrode assembly 20, ensure the efficient transmission of current. The use of copper-aluminum composite pole parts further improves the electrothermal performance and meets the requirements of efficient electronic characteristics and safety. By optimizing the design of the pole, the impact of instantaneous impact on the stability of the explosion-proof valve is reduced, and the safety of the battery is enhanced. At the same time, the setting of the sealing ring 40 effectively improves the sealing performance of the battery, prevents electrolyte leakage, and further improves the reliability of the battery. The riveting process is eliminated, the production steps and complexity are reduced, and the production efficiency and yield are improved. This not only reduces the production cost, but also reduces the product defects caused by improper riveting. The existence of the spacing H indicates that part of the second matching layer 332 is partially disposed in the first assembly hole 311, and the first pole 32, the cover body 31, and the second pole 33 jointly exert an extrusion effect on the sealing ring 40. This extrusion not only enhances the sealing performance and prevents electrolyte leakage, but also effectively prevents the rotation of the first pole 32, thereby improving the overall structural stability and safety of the battery. This design not only ensures the sealing of the battery, but also improves the mechanical strength and reliability of the battery.

[0060] In some embodiments, see Figure 3 , Figure 3 A schematic diagram of the structure of the first pole provided in an embodiment of the present application. The first pole 32 includes a first pole body 321 and a protrusion 322, wherein the first pole body 321 is arranged on the side of the cover body 31 away from the electrode assembly 20, and its main function is to provide a stable connection point so that the current can be transmitted from the inside of the battery to the external circuit. The protrusion 322 is arranged on the side of the first pole body 321 facing the electrode assembly 20 and is connected to the first pole body 321. The protrusion 322 is partially penetrated in the first assembly hole 311, and its function is to achieve mechanical and electrical connection with the second pole 33. The second pole 33 has a second assembly hole 335, and the second assembly hole 335 sequentially penetrates the first matching layer 331, the second matching layer 332, and the third matching layer 333 along the thickness direction of the cover body 31, and part of the protrusion 322 penetrates the second assembly hole 335 and is connected to the inner wall of the first matching layer 331.

[0061] It should be noted that the shape of the protrusion 322 can be circular, square or other shapes, and the shape of the second assembly hole 335 can be circular, square or other shapes. The shape of the protrusion 322 is required to be the same as the shape of the second assembly hole 335 to ensure that the protrusion 322 can penetrate the second assembly hole 335 and form a match with the second assembly hole 335. In addition, welding is used between the protrusion 322 and the first matching layer 331, and the welding area is the abutment between the outer wall of the protrusion 322 and the inner wall of the first matching layer 331 during assembly. The role of welding is to provide a firm mechanical connection to prevent loosening or disconnection caused by vibration or other external forces during use, thereby improving the reliability and safety of the battery. Through the synergistic effect of these structures, the entire battery system in this embodiment can achieve efficient current transmission, while improving the space utilization and safety of the battery. The refinement of the design and the optimization of the structure ensure the stability and reliability of the battery during use.

[0062] In some embodiments, see Figure 4 , Figure 4 A schematic diagram of the structure of the sealing ring provided in the embodiment of the present application. The sealing ring 40 includes a first sealing layer 41, a connecting portion 42 and a second sealing layer 43, wherein the first sealing layer 41 is arranged at the connection between the first pole 32 and the second pole 33, the inner wall of the first sealing layer 41 abuts against the outer wall of the first matching layer 331, and the outer wall of the first sealing layer 41 abuts against the inner wall of the cover body 31. The main function of the first sealing layer 41 is to provide primary sealing, prevent electrolyte leakage from the pole connection, and ensure the safety and reliability of the battery. The connecting portion 42 is arranged along the thickness direction of the cover body 31, one end of the connecting portion 42 is connected to the first sealing layer 41, the side of the connecting portion 42 facing the second pole 33 abuts against the outer wall of the second matching layer 332, and the side of the connecting portion 42 facing away from the second pole 33 abuts against the inner wall of the cover body 31. The function of the connecting portion 42 is to serve as a bridge of the sealing structure, connecting the first sealing layer 41 and the second sealing layer 43, and ensuring the integrity and continuity of the entire sealing system. The second sealing layer 43 is connected to the other end of the connecting portion 42, the inner wall of the second sealing layer 43 abuts against the outer wall of the second matching layer 332, and the end surface of the second sealing layer 43 facing the first pole 32 abuts against the side of the cover plate body 31 facing the electrode assembly 20. The function of the second sealing layer 43 is to provide secondary sealing, further enhance the sealing effect, and prevent any possible leakage.

[0063] In this embodiment, through the synergistic effect of these structures, the sealing ring 40 achieves a multi-level sealing effect. The first sealing layer 41 provides primary sealing, the connecting portion 42 ensures the continuity and integrity of the seal, and the second sealing layer 43 provides secondary sealing. Such a design not only improves the reliability of the seal, but also enhances the overall safety of the battery. The multi-level sealing structure effectively prevents the leakage of the electrolyte and ensures the stability and safety of the battery under various conditions of use. The refinement of the design and the optimization of the structure enable the battery to maintain high efficiency and reliable performance in complex application environments.

[0064] In some embodiments, see Figure 5 , Figure 6 , Figure 7 , Figure 5 A schematic diagram of parameters of each matching layer in the thickness direction provided in an embodiment of the present application, Figure 6 A schematic diagram of parameters of the sealing ring in the thickness direction provided in an embodiment of the present application, Figure 7 Schematic diagram of various parameters in the width direction provided by the embodiment of the present application. In the thickness direction of the cover plate body 31, the height of the first matching layer 331 is T 1 mm, the height of the second matching layer 332 is T 2 mm, the height of the third matching layer 333 is T 3 mm, satisfying 1.2mm≤T 1 =T 2 =T 3 ≤2.0mm; the height of the fourth matching layer 334 is T 4 mm, satisfying 0.5mm≤T 4 In the thickness direction of the cover body 31, the height between the end surface of the second matching layer 332 facing the first pole 32 and the end surface of the first matching layer 331 facing the first pole 32 is H 1 mm, the height between the end surface of the third matching layer 333 facing the first pole 32 and the end surface of the cover plate body 31 facing the electrode assembly 20 is H 2 mm, satisfying 0.5mm≤H 1 =H 2 ≤1.2mm. In the width direction of the cover body 31, the distance between the inner wall and the outer wall of the first matching layer 331 is W 1 mm, satisfying 2.5mm≤W 1 ≤4.8mm; the distance between the outer wall of the second matching layer 332 and the outer wall of the first matching layer 331 is W 2 mm, satisfying 0.8mm≤W 2 ≤1.6mm; the distance between the outer wall of the third matching layer 333 and the outer wall of the second matching layer 332 is W 3 mm, satisfying 0.8mm≤W3 ≤2.0mm.

[0065] It should be noted that the height T 1 、T 2 、T 3 It can be any value among 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, or a range between any two values. 1 、T 2 、T 3 Height range (1.2mm≤T 1 =T 2 =T 3 ≤2.0mm) ensures reliable cooperation with the first pole 32. These heights provide sufficient mechanical strength, ensuring the structural stability of the product and the compression of the sealing ring 40. Height T 4 It can be any value among 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, or a range between any two values. 4 Height range (0.5mm≤T 4 ≤1.2mm) ensures the welding reliability with the tab 22 and provides a good electrical connection. 1 It can be any value among 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, or a range value between any two values. 1 Range (2.5mm≤W 1 ≤4.8mm) ensures the distance between the inner wall and the outer wall of the first matching layer 331, providing reliable matching with the first pole 32. 2 It can be any value among 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm or a range between any two values. 3It can be any value among 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, or a range between any two values; W 2 and W 3 The setting ensures the spacing between the matching layers, where W 3 (0.8mm≤W 3 ≤2.0mm) provides the necessary space to prevent the first pole 32 from rotating. 1 and H 2 It can be any value among 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, or a range between any two values. 1 and H 2 Range (0.5mm≤H 1 =H 2 ≤1.2mm) is the height of the sealing ring 40 after compression, ensuring the sealing performance. The height of the second matching layer 332 needs to be ≥5mm to prevent the first pole 32 from rotating, while meeting the requirement of 0.5mm≤H≤1.5mm. This design ensures that the first pole 32 will not loosen or rotate due to external force during use.

[0066] In some embodiments, the first pole 32 and the second pole 33 are both stamped one-time forming structures. It should be noted that the stamped one-time forming structure can significantly improve production efficiency. Through the one-time forming process, the processing steps and time can be reduced, thereby reducing production costs. In addition, this process can ensure the dimensional accuracy and consistency of the poles, and improve the quality and reliability of the products. The stamped pole structure usually has higher mechanical strength and stability. This is because the stamping process can form a uniform stress distribution inside the material, reducing weaknesses that may be introduced due to welding or other connection methods. This strength and stability are crucial for the battery to withstand physical stress and vibration during use. The stamped structure of the first pole 32 and the second pole 33 is tightly combined with the various mating layers of the cover body 31.

[0067] In some embodiments, Figure 1 and Figure 2As shown, the single cell also includes an upper plastic 50, which is arranged between the first pole 32 and the cover body 31, and part of the upper plastic 50 wraps the outer circumference of the first pole 32. It should be noted that the presence of the upper plastic 50 provides additional insulation protection. By wrapping the outer circumference of the first pole 32, the upper plastic 50 effectively prevents possible electrical short circuits between the electrode and the cover body 31, thereby improving the safety of the battery. The upper plastic 50 plays a role of buffering and supporting in structure. The upper plastic 50 can absorb and disperse the mechanical stress applied to the first pole 32 during battery assembly and use, reduce the risk of wear and deformation of the pole, and thus extend the service life of the battery. In addition, the upper plastic 50 can also enhance the sealing performance of the battery. By providing an additional sealing layer at key locations, the upper plastic 50 helps prevent electrolyte leakage and further improves the safety and reliability of the battery.

[0068] In some embodiments, see Figure 2 , Figure 2 A cross-sectional view of a single cell provided in an embodiment of the present application from another angle. The electrode assembly 20 includes an electrode body 21 and a pole ear 22. The electrode body 21 is arranged in the accommodating cavity 11 and connected to the second pole 33; one end of the pole ear 22 is connected to the electrode body 21, and the other end is connected to the side of the fourth matching layer 334 away from the second pole 33. It should be noted that, as the core part of the battery, the electrode body 21 is responsible for electrochemical reactions, thereby storing and releasing electrical energy, and its connection with the first pole 32 ensures the effective conduction of current. The pole ear 22 is used to conduct current from the electrode body 21 to the external circuit. Through this connection method, the pole ear 22 not only ensures the smooth conduction of current, but also provides flexibility to adapt to the mechanical stress and thermal expansion that may occur during the use of the battery. And the pole ear 22 fits tightly between the electrode body 21 and the fourth matching layer 334, which can effectively reduce its axial length in the overall structure of the battery.

[0069] The present application also discloses a battery pack, including a single cell as in the above embodiment, so that it can have all the technical features and technical effects of the above single cell, which will not be described in detail here.

[0070] The present application also discloses an electrical device, including a single cell as in the above embodiment, or a battery pack as in the above embodiment, so that it can have all the technical features and technical effects of the single cell or battery pack, which will not be described in detail here.

[0071] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0072] The single cells, battery packs and electrical equipment provided in the embodiments of the present application are 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. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single cell battery, characterized in that: include: A housing having a receiving cavity; An electrode assembly is disposed in the accommodating cavity; A cover plate assembly, comprising a cover plate body, a first pole, and a second pole, wherein the cover plate body seals the accommodating cavity and is connected to the shell, and the cover plate body has a first assembly hole; the first pole is arranged on a side of the cover plate body away from the electrode assembly, and the first assembly hole is partially penetrated; the second pole is located in the accommodating cavity, and the second pole comprises a first matching layer, a second matching layer, a third matching layer, and a fourth matching layer which are sequentially arranged in a step-like manner along the thickness direction of the cover plate body, the first matching layer penetrates the first assembly hole and is connected to the first pole, the fourth matching layer is arranged on both sides of the third matching layer along the width direction of the cover plate body and is connected to the third matching layer, and the electrode assembly is connected to a side of the fourth matching layer away from the first pole; A sealing ring, arranged at the connection between the first pole and the second pole, and abutting against the cover plate body; The distance between the end surface of the second matching layer facing away from the electrode assembly and the end surface of the cover plate body facing the electrode assembly is H mm, satisfying 0.5 mm ≤ H ≤ 1.5 mm.

2. The single cell according to claim 1, characterized in that: The first pole comprises: A first pole body, disposed on a side of the cover body away from the electrode assembly; A convex block is arranged on a side of the first pole body facing the electrode assembly, connected to the first pole body, and partially penetrated through the first assembly hole; The second pole has a second assembly hole, which passes through the first matching layer, the second matching layer, and the third matching layer in sequence along the thickness direction of the cover plate body, and part of the protrusions penetrate the second assembly hole and are connected to the inner wall of the first matching layer.

3. The single cell according to claim 2, characterized in that: The sealing ring comprises: A first sealing layer is provided at the connection between the first pole and the second pole, wherein the inner wall of the first sealing layer abuts against the outer wall of the first matching layer, and the outer wall of the first sealing layer abuts against the inner wall of the cover body; A connecting portion is arranged along the thickness direction of the cover body, one end of the connecting portion is connected to the first sealing layer, a side of the connecting portion facing the second pole is in contact with the outer wall of the second matching layer, and a side of the connecting portion facing away from the second pole is in contact with the inner wall of the cover body; The second sealing layer is connected to the other end of the connecting portion, the inner wall of the second sealing layer abuts against the outer wall of the second matching layer, and the end surface of the second sealing layer facing the first pole abuts against the side of the cover plate body facing the electrode assembly.

4. The single cell according to claim 3, characterized in that: In the thickness direction of the cover plate body, the height of the first matching layer is T1 mm, the height of the second matching layer is T2 mm, and the height of the third matching layer is T3 mm, satisfying 1.2 mm ≤ T1 = T2 = T3 ≤ 2.0 mm; The height of the fourth matching layer is T4 mm, satisfying 0.5 mm ≤ T4 ≤ 1.2 mm.

5. The single cell according to claim 3, characterized in that: In the thickness direction of the cover body, the height between the end surface of the second matching layer facing the first pole and the end surface of the first matching layer facing the first pole is H1mm, and the height between the end surface of the third matching layer facing the first pole and the end surface of the cover body facing the electrode assembly is H2mm, satisfying 0.5mm≤H1=H2≤1.2mm.

6. The single cell according to claim 3, characterized in that: In the width direction of the cover plate body, the distance between the inner wall and the outer wall of the first matching layer is W1mm, satisfying 2.5mm≤W1≤4.8mm; The distance between the outer wall of the second matching layer and the outer wall of the first matching layer is W2 mm, satisfying 0.8 mm ≤ W2 ≤ 1.6 mm; The distance between the outer wall of the third matching layer and the outer wall of the second matching layer is W3 mm, satisfying 0.8 mm≤W3≤2.0 mm.

7. The single cell according to claim 1, characterized in that: The first pole and the second pole are both one-step stamping structures.

8. The single cell according to claim 1, characterized in that: The electrode assembly comprises: An electrode body, disposed in the accommodating cavity and connected to the second pole; A pole ear, one end of which is connected to the electrode body, and the other end of which is connected to a side of the fourth matching layer away from the second pole.

9. A battery pack, characterized in that: The invention comprises a single cell as claimed in any one of claims 1 to 8.

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

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