Shell, battery and electric device

Abstract

The invention relates to the technical field of batteries, in particular to a shell, a battery and an electric device. The provided shell is used for containing an electrode assembly and comprises a shell body and an insulating coating, the shell body comprises a bottom wall and a side wall, the side wall is arranged around the bottom wall in a surrounding mode, one end of the side wall is connected with the bottom wall, an opening is formed in the other end of the side wall, and the side wall and the bottom wall jointly define a containing cavity used for containing the electrode assembly; the insulating coating is attached to the bottom wall and the side wall, is formed by coating a paint, and is used for separating the bottom wall from the bottom surface of the electrode assembly and separating the side wall from the side surface of the electrode assembly. The battery comprises the shell provided by the invention. The problem that insulation between the electrode assembly and the shell is achieved by adopting Mylar and a bottom supporting plate at present can be relieved, assembling procedures and parts are reduced, the risk of short circuit of the battery can be reduced, and the safety of the battery can be improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to a casing, a battery, and an electrical device. Background Technology

[0002] In the battery structure, the electrode assembly is housed in a casing, which protects the electrode assembly. Furthermore, by encapsulating the electrode assembly with a soft and flexible Mylar film (Mylar film or polyester film), damage to the electrode assembly from the casing can be prevented.

[0003] In related technologies, the main process in the battery coating stage involves wrapping the electrode assembly with Mylar film and a base plate. The base plate is placed at the bottom of the electrode assembly, and the Mylar film wraps around both sides of the electrode assembly. After the overall wrapping is completed, heat fusion is performed to melt the Mylar film to the bottom edge of the cover plate. That is, in traditional batteries, insulation between the electrode assembly and the casing is achieved using Mylar and a base plate. This requires heat fusion of the Mylar and the base plate, followed by heat fusion of the Mylar with the folded-over electrode assembly and the underlying plastic to achieve insulation. This process is relatively complex and has low production efficiency.

[0004] Furthermore, some related technologies use insulating components to insulate and protect the electrode assembly, preventing short circuits caused by contact between the electrode assembly and the casing. However, these insulating components are separate from the casing. During battery production and use, the insulating components are prone to shifting under external forces, increasing the risk of short circuits and necessitating improvement. Summary of the Invention

[0005] In view of this, the present invention aims to at least partially solve one of the technical problems in the related art. To this end, the present invention provides a housing, a battery, and an electrical device that not only alleviates the problem of using Mylar and a base plate to achieve insulation between the electrode assembly and the housing, reducing assembly steps and components, but also reduces the risk of battery short circuits, thereby improving battery safety.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] According to a first aspect of this application, a housing is provided for accommodating an electrode assembly, the housing comprising:

[0008] The housing body includes a bottom wall and a side wall, the side wall surrounds the bottom wall and one end of the side wall is connected to the bottom wall, the other end of the side wall forms an opening, and the side wall and the bottom wall together define a receiving cavity for accommodating the electrode assembly.

[0009] An insulating coating is attached to the bottom wall and the side wall, the insulating coating being formed by coating, for separating the bottom wall from the bottom surface of the electrode assembly, and separating the side wall from the side surface of the electrode assembly.

[0010] In addition, the housing according to this application may also have the following additional technical features:

[0011] In some embodiments, the thickness of the insulating coating is 50 μm to 200 μm.

[0012] In some embodiments, the distance between the upper edge of the insulating coating and the opening is ≥0.1 mm.

[0013] In some embodiments, the upper edge of the insulating coating has a raised and recessed structure along the length of the housing, or the upper edge of the insulating coating is straight.

[0014] In some embodiments, the insulating coating includes at least one of a fluoropolymer coating, a polymer-ceramic composite coating, or a resin coating.

[0015] In some embodiments, the fluoropolymer coating comprises a fluoropolymer and an additive, wherein the fluoropolymer comprises at least one of polyvinylidene fluoride, polytetrafluoroethylene, polyethylene-tetrafluoroethylene, or polyvinylidene fluoride.

[0016] In some embodiments, the polymer-ceramic composite coating comprises a polymer, a ceramic material, and additives, wherein the polymer comprises at least one of fluorinated polyimide, fluorinated polyamide, polyvinylidene fluoride, or polytetrafluoroethylene, and the ceramic material comprises at least one of alumina, zirconium oxide, yttrium oxide, magnesium oxide, cobalt oxide, chromium oxide, or zinc oxide.

[0017] In some embodiments, the resin coating includes a resin, a curing agent, and additives, wherein the resin includes an epoxy resin.

[0018] In some embodiments, the insulating coating on the bottom wall directly abuts against the bottom surface of the electrode assembly, so that the bottom of the housing does not contain a base plate.

[0019] According to a second aspect of this application, this application provides a battery comprising:

[0020] The casing as described above;

[0021] An electrode assembly is disposed within the housing, and the bottom and side surfaces of the electrode assembly are in contact with the insulating coating.

[0022] A cover plate that closes onto the opening of the housing.

[0023] In some embodiments, the cover plate includes a cover plate body and a first plastic component disposed on the lower side of the cover plate body; the first plastic component includes at least one support portion and at least one body portion, wherein the height of the support portion is higher than the height of the body portion in a predetermined direction, the predetermined direction representing the height direction of the battery; in the length direction of the battery, the insulating coating has a first overlapping area covering at least a portion of the support portion, and / or, the insulating coating has a second overlapping area covering at least a portion of the body portion.

[0024] In some embodiments, the first plastic part includes multiple support sections and multiple body sections, and the support sections are provided at both ends of the first plastic part; in a preset direction, the height of each support section is a, and the height of each first overlapping area is A, wherein A and a satisfy: 15% ≤ A / a ≤ 85%.

[0025] In some of these embodiments, in a predetermined direction, the height of each segment of the main body is b, and the height of each segment of the second overlapping region is B, wherein B and b satisfy: 25% ≤ B / b ≤ 75%.

[0026] In some embodiments, the electrode assembly is provided with tabs, which are electrically connected to the cover plate; in the length direction of the battery, the length of the second overlapping region is denoted as C0, the length of the body portion is denoted as C1, and the length of the tabs is denoted as C2; C0, C1, and C2 satisfy: 110%C2≤C0≤1000%C1.

[0027] According to a third aspect of this application, this application provides an electrical appliance, the electrical appliance comprising:

[0028] The main body of the electrical appliance; and

[0029] The battery as described above is electrically connected to the main body of the electrical device.

[0030] Implementing the technical solution of the present invention has at least the following beneficial effects:

[0031] In this embodiment, the provided housing includes a housing body and an insulating coating. The insulating coating is formed on the housing body by coating, and is attached to the bottom and side walls of the housing body. It can be used to separate the bottom wall of the housing body from the bottom surface of the electrode assembly, and to separate the side walls of the housing body from the side surfaces of the electrode assembly. Therefore, compared with the existing method of separately manufacturing the insulating component and the housing, the housing body and the insulating coating in this application are an integral structure. This can reduce or avoid the problem that the insulating component is prone to displacement under external force during the production and use of the battery, which increases the risk of short circuit. It can ensure the stability of the structure. The housing body and the insulating coating are tightly and reliably connected, which improves the reliability of use, reduces the risk of short circuit, and can also alleviate the impact of the excessive size of the insulating component on the capacity of the housing. It can ensure the energy density of the battery with this housing.

[0032] Furthermore, in batteries with this casing, the bottom plate can be omitted. The insulating coating can be used to insulate the side and bottom walls of the casing from the electrode assembly, which can reduce assembly steps. Unlike the Mylar technology in the prior art, it does not require folding and wrapping the electrode assembly and then heat-melting it with the lower plastic part. It can also reduce the number of parts (by removing the bottom plate), simplifying operation and improving production efficiency.

[0033] Furthermore, by defining the relevant dimensional characteristics of the overlapping area between the insulating coating and the first plastic part, this application can improve the insulation test performance of the electrode assembly, meet the insulation requirements, improve the welding yield of the housing and cover, and prevent the insulating coating from being burned after the housing and cover are welded, thereby improving the overall assembly yield of the battery.

[0034] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0035] Figure 1 The diagram shown is a structural schematic of a shell provided in an embodiment of the present invention;

[0036] Figure 2 The diagram shown is a structural schematic of a battery provided in an embodiment of the present invention;

[0037] Figure 3 The diagram shown is an explosion illustration of a battery according to an embodiment of the present invention.

[0038] Figure 4 The image shown is a cross-sectional view of a battery provided in an embodiment of the present invention;

[0039] Figure 5The diagram shown is a schematic representation of a battery structure in which an insulating coating and a cover plate form an overlapping area, according to an embodiment of the present invention.

[0040] Figure 6 The diagram shown is a schematic representation of another battery structure in which the insulating coating and the cover plate form an overlapping area, according to an embodiment of the present invention.

[0041] Figure 7 for Figure 6 A partially enlarged schematic diagram.

[0042] Explanation of reference numerals in the attached figures:

[0043] 10-Housing shell; 110-Housing shell body; 111-Opening; 120-Insulating coating;

[0044] 121 - First overlapping region; 122 - Second overlapping region; 123 - Third overlapping region;

[0045] 20 - Electrode assembly; 210 - Tab;

[0046] 30-Cover plate; 301-First plastic part; 302-Second plastic part; 303-Cover plate body; 304-Position post;

[0047] 311-Support section; 312-Main body section. Detailed Implementation

[0048] The present application will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present application.

[0049] Hereinafter, embodiments of the housing, battery, and power supply device of this application are disclosed in detail with appropriate reference to the accompanying drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of actually identical structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0050] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0051] As analyzed in the background section, in traditional batteries, insulation between the electrode assembly and the casing is achieved using Mylar and a base plate. This requires heat-fusion of the Mylar and the base plate, followed by heat-fusion of the Mylar with the folded-over electrode assembly and the lower plastic to achieve insulation. This process is complex, impacting manufacturing costs and delivery time. Furthermore, existing insulation components and casings are separate units. During battery production and use, under external forces, the insulation components are prone to displacement, increasing the risk of short circuits. Existing technologies lack effective solutions to these problems. Therefore, this application provides a casing, as well as a battery and electrical device incorporating the casing. The following is a detailed description of this application.

[0052] Figure 1 A schematic diagram of a shell structure; Figure 2 This is a schematic diagram of a battery structure. Figure 3 This is a schematic diagram of a battery explosion; Figure 4 It is a cross-sectional view of a battery; Figure 5 This is a schematic diagram of a battery structure in which an insulating coating and a cover plate form an overlapping area. Figure 6 This is a schematic diagram of another type of battery where the insulating coating and the cover plate form an overlapping area. Figure 7 for Figure 6 A partially enlarged schematic diagram.

[0053] [case]

[0054] refer to Figures 1 to 7 As shown, in some embodiments, this application provides a housing 10 for accommodating an electrode assembly 20, the housing 10 comprising:

[0055] The housing body 110 includes a bottom wall and a side wall. The side wall surrounds the bottom wall, and one end of the side wall is connected to the bottom wall. The other end of the side wall forms an opening 111. The side wall and the bottom wall together define a receiving cavity for accommodating the electrode assembly 20.

[0056] An insulating coating 120 is attached to the bottom wall and the side wall. The insulating coating 120 is formed by coating and is used to separate the bottom wall from the bottom surface of the electrode assembly 20, and to separate the side wall from the side surface of the electrode assembly 20.

[0057] In this application, the preset direction can characterize the height direction of the battery.

[0058] In the aforementioned housing 10, the sidewalls of the housing body 110 surround the bottom wall, with one end of the sidewall (e.g., the bottom end of the sidewall) connected to the bottom wall, and the other end of the sidewall (e.g., the upper end of the sidewall) opening 111. The sidewalls and the bottom wall together define a receiving cavity for accommodating the electrode assembly 20. Furthermore, the housing 10 of this application also includes an insulating coating 120, which is formed by coating. The insulating coating 120 can be attached to the bottom wall and sidewalls of the housing body 110, serving to separate the bottom wall from the bottom surface of the electrode assembly 20, and to separate the sidewalls from the side surfaces of the electrode assembly 20. That is, the insulating coating 120 is provided between the electrode assembly 20 and the bottom wall of the housing body 110, and between the electrode assembly 20 and the sidewalls of the housing body 110. At least a portion of the insulating coating 120 is higher than the sidewalls in a predetermined direction, i.e., the height direction.

[0059] Therefore, compared to the existing method of separately manufacturing the insulating components and the casing, the casing body 110 and the insulating coating 120 in the casing 10 of this application are an integral structure. This can effectively improve the bonding strength between the casing body 110 and the insulating coating 120, and reduce or avoid the problem that the insulating components are prone to displacement under external force during battery production and use, which increases the risk of short circuits in the battery. It can also reduce the risk of the insulating coating 120 falling off or gaps forming between the insulating coating 120 and the casing body 110 during battery use, which can ensure the stability of the structure. The casing body 110 and the insulating coating 120 are tightly and reliably connected, which improves the reliability of use, reduces the risk of short circuits, and can also alleviate the impact of the excessive size of the insulating components on the capacity of the casing 10's accommodating space, thus ensuring the energy density of the battery with this casing 10.

[0060] Furthermore, in the battery with the housing 10, the bottom plate can be omitted. The insulating coating 120 is used to insulate the side and bottom walls of the housing 10 from the electrode assembly 20, which can reduce the assembly process. Unlike the Mylar in the prior art, it does not need to be folded and wrapped around the electrode assembly 20 and then heat-fused to the lower plastic part. It can also reduce the number of parts (by removing the bottom plate), making the operation simple and improving the production efficiency.

[0061] Based on this, further, by defining the relevant dimensional characteristics of the overlapping area between the insulating coating 120 and the first plastic part, the insulation test performance of the electrode assembly 20 can be improved, the insulation requirements can be met, the welding yield of the housing 10 and the cover plate 30 can be improved, and the insulating coating 120 will not be burned after the housing 10 and the cover plate 30 are welded, which is conducive to improving the overall assembly yield of the battery.

[0062] The housing 10 of this application can be used not only to house the electrode assembly 20, but also to house electrolytes, such as electrolyte solution. The housing 10 can have various structural forms. The material of the housing 10 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc., and this application does not limit it in this regard.

[0063] In this application, the housing 10 has an opening 111 at one end, such as the upper end of the housing 10, meaning the housing 10 is a hollow structure with an opening 111 at one end. The cover plate 30 can be fitted onto the opening 111 of the housing 10 to form a sealed connection, thereby creating a sealed space for accommodating the electrode assembly 20 and the electrolyte. When assembling the battery, the electrode assembly 20 can be placed into the housing 10 first, and the electrolyte can be filled into the housing 10. Then, the cover plate 30 can be fitted onto the opening 111 of the housing 10.

[0064] Optionally, the housing 10 can have various shapes, such as a cylinder, a cuboid, etc. The shape of the housing 10 can be determined according to the specific shape of the electrode assembly 20, and this application does not impose any restrictions on it.

[0065] In some embodiments, the thickness of the insulating coating 120 is 50 μm to 200 μm. As an example, the thickness of the insulating coating 120 can be any one of 50 μm, 60 μm, 80 μm, 100 μm, 120 μm, 150 μm, and 200 μm, or a range between any two.

[0066] By controlling the thickness of the insulating coating 120 within the aforementioned range, insulation performance and reliability can be guaranteed, ensuring the strength of the insulating coating 120 remains within a suitable range. If the thickness of the insulating coating 120 is too small, such as less than 50 μm, insulation is prone to failure, and the withstand voltage strength is low, resulting in a short service life. If the thickness of the insulating coating 120 is too large, such as greater than 200 μm, it will increase costs, the improvement in insulation performance will not be significant, and it will affect the battery's capacity or energy density.

[0067] In some embodiments, the components of the insulating coating 120 may be selected from materials that are insulating and do not react with the electrolyte. Exemplarily, the insulating coating 120 includes at least one of a fluoropolymer coating, a polymer-ceramic composite coating, or a resin coating. For example, the insulating coating 120 may be a fluoropolymer coating, a polymer-ceramic composite coating, a resin coating, or a composite coating formed by any two or three of these three coatings.

[0068] In the embodiments of this application, the selected insulating coating mainly has insulating properties and is resistant to electrolyte, that is, it does not react with electrolyte. The above-mentioned fluorinated polymer coating, polymer-ceramic composite coating or resin coating can meet this requirement, and have a good composite effect with the shell body and are easy to process and manufacture.

[0069] Exemplary examples, in some embodiments, the fluoropolymer coating comprises a fluoropolymer and an additive, wherein the fluoropolymer comprises at least one of polyvinylidene fluoride, polytetrafluoroethylene, polyethylene-tetrafluoroethylene, or polyvinyl fluoride. Optionally, the additive may be one or more of a dispersant, a leveling agent, etc.

[0070] It should be noted that the fluoropolymer coating is mainly composed of fluoropolymer and additives. The additives can be selected according to the actual functional requirements and have corresponding functional needs. For example, to facilitate dispersion, a dispersant can be added, or to facilitate coating uniformity and adhesion, a dispersant and a leveling agent can be added. The specific type of additives is not limited in the embodiments of this application, and can be added according to the actual situation. It will not be described in detail here.

[0071] The aforementioned fluoropolymers can be polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyethylene-tetrafluoroethylene (PETE), polyvinyl fluoride (PVC), or any combination of two or more of these polymers. Preferably, PVDF or PTFE is the preferred fluoropolymer due to their wide availability, lower cost, and good insulation and electrolyte resistance.

[0072] Optionally, in the fluoropolymer coating, the mass ratio of fluoropolymer to additives is 60-80:1-5.

[0073] Optionally, the raw materials for preparing the fluoropolymer coating include a fluoropolymer, additives, and a solvent. That is, the raw materials for preparing the fluoropolymer coating mainly consist of a fluoropolymer, additives, and a solvent. The addition of the solvent mainly serves to facilitate viscosity adjustment and coating. The specific type of solvent can be a conventional organic or inorganic solvent, and there is no limitation on this.

[0074] Optionally, in the raw materials for preparing the fluoropolymer coating, the mass ratio of fluoropolymer, solvent and additive is 60-80:15-30:1-5.

[0075] In some embodiments, the polymer-ceramic composite coating comprises a polymer, a ceramic material, and additives, wherein the polymer comprises at least one of fluorinated polyimide, fluorinated polyamide, polyvinylidene fluoride, or polytetrafluoroethylene, and the ceramic material comprises at least one of alumina, zirconium oxide, yttrium oxide, magnesium oxide, cobalt oxide, chromium oxide, or zinc oxide.

[0076] It should be noted that the polymer-ceramic composite coating is mainly composed of polymer, ceramic material and additives. The additives can be selected according to the actual functional requirements and have corresponding functional needs. For example, to facilitate dispersion, a dispersant can be added, or to facilitate coating uniformity and adhesion, a dispersant and a leveling agent can be added. The specific type of additives is not limited in the embodiments of this application, and can be added according to the actual situation. It will not be described in detail here.

[0077] In the aforementioned polymer-ceramic composite coating, the polymer can be a fluorinated polymer, such as fluorinated polyimide, fluorinated polyamide, polyvinylidene fluoride, polytetrafluoroethylene, or any combination of two or more of these polymers. Preferably, polyvinylidene fluoride or polytetrafluoroethylene is more preferred as it is widely available, has low cost, and possesses good insulation and electrolyte resistance.

[0078] In the aforementioned polymer-ceramic composite coating, the ceramic material can be alumina, zirconium oxide, yttrium oxide, magnesium oxide, cobalt oxide, chromium oxide, zinc oxide, or any combination of two or more of these ceramic materials. Preferably, the ceramic material is selected from alumina or zirconium oxide, which are widely available, have low cost, and possess good mechanical or high-temperature resistance properties.

[0079] Optionally, the particle size of the above-mentioned ceramic material is in the micrometer or nanometer range.

[0080] Optionally, in the polymer-ceramic composite coating, the mass ratio of polymer, ceramic material and additives is 50-75:10-40:1-10.

[0081] Optionally, the raw materials for preparing the polymer-ceramic composite coating include polymers, ceramic materials, additives, and solvents. That is, the raw materials for preparing the polymer-ceramic composite coating mainly consist of polymers, ceramic materials, additives, and solvents. The addition of the solvent mainly serves to facilitate viscosity adjustment and coating. The specific type of solvent can be a conventional organic or inorganic solvent, and there is no limitation on this.

[0082] Optionally, in the raw materials for preparing the polymer-ceramic composite coating, the mass ratio of polymer, ceramic material, additives and solvent is 50-75:10-40:5-25:1-10.

[0083] For example, in some embodiments, the resin coating includes a resin, a curing agent, and additives, wherein the resin includes an epoxy resin.

[0084] It should be noted that, similar to the fluoropolymer coating and polymer-ceramic composite coating mentioned above, this resin coating mainly consists of epoxy resin, curing agent, and additives. The additives do not include curing agents. These additives can be selected according to actual functional requirements, such as dispersants added to facilitate dispersion, or dispersants and leveling agents added to facilitate coating uniformity and adhesion. The embodiments of this application do not limit the specific types of additives, and can be added according to actual conditions. They will not be described in detail here.

[0085] In the above-mentioned resin coatings, the resin is epoxy resin, and the curing agent can be a conventional curing agent, without any restrictions.

[0086] Optionally, in resin coatings, the mass ratio of epoxy resin, curing agent, and additives is 50–75:10–25:5–20.

[0087] It should be understood that the specific proportions of the various substances in the resin coating can be adjusted according to the actual situation, and no specific limitations are imposed.

[0088] In some embodiments, in a predetermined direction, i.e., in the height direction, the upper edge of the insulating coating 120 is lower than the opening 111 on the sidewall of the housing body; that is, the top of the insulating coating 120 in the circumferential direction is lower than the opening 111. Exemplarily, the edge of the insulating coating 120 near the opening 111, i.e., the distance between the upper edge of the insulating coating 120 and the opening 111 is ≥0.1mm. The specific distance between the upper edge of the insulating coating 120 and the opening 111 can be adjusted according to actual conditions, as long as a suitable distance is maintained between them.

[0089] By maintaining a certain distance between the upper edge of the insulating coating 120 and the opening 111, it is convenient to install the cover plate 30 when it is placed over the opening 111 of the housing 10. This avoids the influence and interference during installation, thereby ensuring the reliability of the connection between the cover plate 30 and the housing 10.

[0090] In some embodiments, the upper edge of the insulating coating 120 has a raised and recessed structure along the length of the housing 10. Alternatively, in other embodiments, the upper edge of the insulating coating 120 is straight along the length of the housing 10.

[0091] In this embodiment, the shape and structure of the insulating coating 120 can take many forms. For example... Figure 2 or Figure 3 As shown, the upper edge of the insulating coating 120, that is, its upper end surface, can have a raised and recessed structure in the length direction. This upper end surface structure of the insulating coating 120 can better adapt to the shape and structure of the first plastic part 301. Or, as Figure 5 As shown, the upper edge of the insulating coating 120 can also be a straight structure in the length direction, which makes the structure simple and convenient to process and manufacture.

[0092] In some embodiments, the insulating coating 120 on the bottom wall directly abuts against the bottom surface of the electrode assembly 20, so that the bottom of the housing 10 does not contain a base plate.

[0093] The battery of this application can omit the bottom support plate, which can alleviate the problem of insulation between the electrode assembly 20 and the housing 10 currently achieved using Mylar and a bottom support plate. In the battery production and assembly process, the assembly steps can be reduced, the process of installing the bottom support plate is eliminated, and it is not necessary to fold and wrap the electrode assembly and then heat-melt it with the lower plastic as with Mylar. It also reduces the number of parts, that is, by eliminating the bottom support plate, it is beneficial to improve the battery production efficiency and reduce the number of parts.

[0094] In addition, by replacing the bottom plate inside the housing 10 for isolating the housing 10 and the electrode assembly 20 with the insulating coating 120, the phenomenon of poor wetting of the electrode assembly 20 caused by the obstruction of the bottom plate when the electrolyte flows back inside the housing 10 can be alleviated, which is beneficial to improving the performance of the battery. It can also provide a certain degree of protection for the housing 10, reduce the particles and powder falling from the electrode assembly 20 and the direct contact between the electrolyte and the bottom wall of the housing 10, thereby improving the corrosion resistance and leakage prevention of the housing 10, and thus improving the service life of the battery.

[0095] [Battery]

[0096] In some embodiments, this application provides a battery including a housing 10, an electrode assembly 20, and a cover plate 30. The housing 10 may be the housing 10 described in the first aspect above.

[0097] The aforementioned housing 10 has a receiving cavity for placing the electrode assembly 20. The electrode assembly 20 can be disposed in the receiving cavity of the housing 10. An opening 111 can be formed at the upper end of the housing 10, and a cover plate 30 can be closed to the opening 111 of the housing 10, that is, the cover plate 30 can be used to seal the receiving cavity. A terminal post 304 can be disposed on the cover plate 30, and the electrode assembly 20 is electrically connected to the terminal post 304. The electrode assembly 20 is the core part of the battery, and the charging and discharging of the battery mainly depends on the electrode assembly 20.

[0098] When the electrode assembly 20 is placed in the receiving cavity of the housing 10, both the bottom and side surfaces of the electrode assembly 20 are in contact with the insulating coating 120. The insulating coating 120 can be used to separate the electrode assembly 20 from the bottom wall of the housing body 110 and from the side walls of the housing body 110. In this embodiment, the insulating coating 120 is disposed between the electrode assembly 20 and the side and bottom walls of the housing body 110, which can achieve insulation between the electrode assembly 20 and the housing body 110, and can also be used to protect the electrode assembly 20 and reduce or avoid damage to the electrode assembly 20.

[0099] In this application, during the battery assembly process, the coating can be applied to the bottom wall and side wall of the housing body 110 to form an insulating coating 120 on the housing body 110, thereby obtaining the housing 10, and then the electrode assembly 20 is placed in the housing 10.

[0100] This application provides an insulating coating 120 between the electrode assembly 20 and the housing body 110. This insulating coating 120 not only provides insulation between the electrode assembly 20 and the housing body 110, but also replaces the conventional method of using Mylar and a base plate for insulation, thus alleviating the problems associated with this method. Furthermore, by replacing the base plate used to isolate the housing from the electrode assembly 20 with the insulating coating 120, the poor wetting of the electrode assembly 20 caused by the base plate obstructing electrolyte backflow within the housing is mitigated, improving battery performance. It also provides some protection to the housing, reducing the direct contact between particles and powder from the electrode assembly 20 and the electrolyte with the bottom wall of the housing, thereby improving the housing's corrosion and leakage resistance, and ultimately extending the battery's lifespan.

[0101] In the battery production and assembly process, assembly steps can be reduced, the process of installing the base plate can be eliminated, and it is not necessary to fold and wrap the electrode group and then heat-melt it with the lower plastic like Mylar. It also reduces the number of parts, that is, by removing the base plate, which helps to improve battery production efficiency and reduce the size of parts.

[0102] Furthermore, the insulating coating 120 of this application overlaps with at least a portion of the first plastic part 301 (the lower plastic part) in the cover plate 30. For example, the insulating coating 120 covers at least a portion of the lower plastic part in the height direction, thus creating an overlapping area between them. This overlapping area, especially when it meets preset range requirements, can improve the insulation test performance of the electrode assembly 20, meet insulation requirements, and increase the welding yield of the housing 10 and the cover plate 30. After welding, the insulating coating 120 will not be burned, which is beneficial for improving the overall assembly yield of the battery.

[0103] Optionally, the electrode assembly 20 can be a prismatic or cylindrical structure. As an example, this application mainly describes the electrode assembly 20 as a square columnar structure, but this application is not limited to this. Correspondingly, the housing body 110 and the insulating coating 120 can be frame-shaped to adapt to the shape of the electrode assembly 20. For example, the shape of the housing body 110 and the insulating coating 120 can also be a square columnar structure, with the upper end of the insulating coating 120 and the housing body 110 open 111 and the lower end closed.

[0104] In the battery of this application, the casing 10 can be used to house the electrode assembly 20 and the electrolyte; the cover 30 mainly refers to the component that covers the opening 111 of the casing 10 to isolate the internal environment of the battery from the external environment. In any case, the shape of the cover 30 can be adapted to the shape of the casing 10 to fit the casing 10. Optionally, the cover 30 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the cover 30 is not easily deformed when subjected to compression and impact, enabling the battery to have higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on the cover 30. The electrode terminals can be used to electrically connect to the electrode assembly 20 for outputting or inputting electrical energy from the battery.

[0105] Optionally, the aforementioned housing 10 is a component used to cooperate with the cover plate 30 to form the internal environment of the battery, wherein the formed internal environment can be used to accommodate the electrode assembly 20, electrolyte, and other components. The housing 10 and the cover plate 30 can be independent components, and an opening 111 can be provided on the housing 10. The cover plate 30 closes the opening 111 to form the internal environment of the battery. Optionally, the shape of the housing 10 can be determined according to the specific shape and size of the electrode assembly 20. The material of the housing 10 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0106] Optionally, the cover plate 30 in this application may include a cover plate body 303, a pole post 304, a first plastic part 301, and a second plastic part 302. The first plastic part 301 and the second plastic part 302 may be respectively disposed on both sides of the cover plate body 303. For example, the first plastic part 301 may be disposed on the lower side of the cover plate body 303, and the first plastic part 301 may also be referred to as the lower plastic part. The second plastic part 302 may be disposed on the upper side of the cover plate body 303, and the second plastic part 302 may also be referred to as the upper plastic part. At least a portion of the pole post 304 may pass through the first plastic part 301, the cover plate body 303, and the second plastic part 302.

[0107] The cover plate 30 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery reaches a threshold. The material of the cover plate body 303 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and this embodiment does not impose any special limitations on this. Optionally, in this embodiment, the cover plate body 303 can be a plain aluminum plate.

[0108] Optionally, the cover plate 30 may further include a sealing element, which is sleeved on the pole post 304 to seal the cover plate body 303 and the pole post 304. For example, the cover plate body 303 is provided with a hole for the pole post 304 for mounting the pole post 304; and the cover plate body 303, the first plastic part 301, the sealing element, and the second plastic part 302 are all provided with pole post holes through which the pole post 304 passes. For example, from bottom to top, the pole post 304 can sequentially pass through the first plastic part 301, the sealing element, the cover plate body 303, and the second plastic part 302.

[0109] In the battery of this application, the electrode assembly 20 is the component in which the electrochemical reaction occurs. The electrode assembly 20 may include one or more bare cells, and multiple bare cells may be arranged in a certain manner, such as multiple bare cells may be arranged side by side along their own width direction. The bare cells are mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The embodiments of this application do not limit the specific structure of the bare cells or the materials of the positive and negative electrodes and the separator.

[0110] In some embodiments, the first plastic part 301 includes at least one support portion 311 and at least one body portion 312. In a predetermined direction, the height of the support portion 311 is higher than the height of the body portion 312. The predetermined direction represents the height direction of the battery. In the length direction of the battery, the insulating coating 120 has a first overlapping region 121 covering at least a portion of the support portion 311, and / or, in the length direction of the battery, the insulating coating 120 has a second overlapping region 122 covering at least a portion of the body portion 312.

[0111] The aforementioned first plastic part 301, also known as the lower plastic part, can consist of multiple support sections 311 and multiple body sections 312. It should be understood that the support sections 311 primarily serve a supporting function, and their height in the vertical direction is greater than that of the body sections 312. For example, the support sections 311 will protrude downwards relative to the body sections 312. The support sections 311 and body sections 312 can have multiple sections, which can be selected and set according to actual conditions. This embodiment does not specify this.

[0112] The insulating coating 120 of this application has an overlapping area with at least a portion of the first plastic part 301 in the height and length directions. As an example, the insulating coating 120 has an overlapping area covering at least a portion of the support portion 311, and the insulating coating 120 also has an overlapping area covering at least a portion of the body portion 312.

[0113] The phrase "at least partially" primarily refers to the fact that, in the height direction, the insulating coating 120 may cover the entire support portion 311 and the body portion 312, or it may only cover a portion of the support portion 311 and the body portion 312. In this application, it is more preferred that the insulating coating 120 covers a portion of the support portion 311 and the body portion 312, and the covered portion is more preferred within the preset range specified in this application. This helps to improve the welding yield, reduce or avoid burns to the insulating coating 120, and improve the production yield of the battery.

[0114] The following description mainly uses the first plastic part 301, which includes four support sections 311 and two body sections 312, as an example. It should be understood that in other embodiments, support sections 311 with other numbers of sections can also be provided. This application does not impose any special restrictions on this.

[0115] In some embodiments, the first plastic part 301 includes multiple support portions 311 and multiple body portions 312, with support portions 311 provided at both ends of the first plastic part 301. Exemplarily, along the length of the battery, the first plastic part 301 includes a first support portion, a first body portion, a second support portion, a third support portion, a second body portion, and a fourth support portion arranged sequentially; the insulating coating 120 includes a first overlapping region 121 covering the first support portion, a second overlapping region 122 covering the first body portion, a first overlapping region 121 covering the second support portion, a first overlapping region 121 covering the third support portion, a second overlapping region 122 covering the second body portion, and a first overlapping region 121 covering the fourth support portion, arranged sequentially.

[0116] In some embodiments, the first support portion, the second support portion, the third support portion, and the fourth support portion have the same height; the first body portion and the second body portion have the same height.

[0117] The first plastic part 301 may be provided with four support sections 311. In the length direction, the first plastic part 301 may include a first support section, a first body section, a second support section, a third support section, a second body section and a fourth support section arranged in sequence. The insulating coating 120 may cover each of the above-mentioned support sections 311 and each of the body sections 312. The overlap size of the insulating coating 120 covering the support sections 311 and the overlap size of the insulating coating 120 covering the body sections 312 may have a certain difference, thereby ensuring the welding effect of the housing 10 and the cover plate 30 and meeting the insulation test requirements of the electrode assembly 20.

[0118] In some embodiments, in a preset direction, i.e., the height direction, the height of each support segment 311 is 'a', and the height of each first overlapping region 121 is 'A'. That is, the height of the first support segment, the second support segment, the third support segment, and the fourth support segment can all be 'a', and correspondingly, the height of the first overlapping region 121 of each of the above-mentioned segments is 'A'. The 'A' and 'a' satisfy: 15% ≤ A / a ≤ 85%. As an example, A / a can be any one of 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, and 85%, or a range between any two.

[0119] The height of the first overlapping region 121 can also be understood as the distance A between the bottom surface of the support 311 and the upper surface of the insulating coating 120 within the first overlapping region 121. The ratio of the height A of the first overlapping region 121 to the height a of the support 311 needs to meet a certain range. If the ratio, i.e., A / a, is too small, the portion of the insulating coating 120 covering the support 311 will be small, resulting in a higher risk of insulation failure. If the ratio, i.e., A / a, is too large, it will affect the welding effect of the housing 10 and the cover plate 30. For example, after the housing 10 and the cover plate 30 are welded, the insulating coating 120 may show slight burns, the welding yield will decrease, and the first plastic part 301 will be close to the cover plate body 303, affecting the welding of the housing 10 and the cover plate 30.

[0120] Therefore, the inventors discovered that by limiting A / a to the following range: 15% ≤ A / a ≤ 85%, the risk of insulation failure can be reduced, the welding effect of the housing 10 and the cover plate 30 can be guaranteed, the welding yield can be improved, and the burning of the insulating coating 120 can be reduced or avoided. This allows the insulation test of the cell (electrode assembly) to pass normally, and the insulating coating 120 does not show any burning after the housing 10 and the cover plate 30 are welded, and the welding yield is normal.

[0121] In some embodiments, in a preset direction, i.e., the height direction, the height of each segment of the main body 312 is b, and the height of each segment of the second overlapping region 122 is B. That is, the height of both the first and second main bodies can be b, and correspondingly, the height of the second overlapping region 122 of each of the above-mentioned parts is B. The B and b satisfy: 25% ≤ B / b ≤ 75%. As an example, B / b can be any one of 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, and 75%, or a range between any two.

[0122] The height of the second overlapping region 122 can also be understood as the distance B between the bottom surface of the body portion 312 and the upper surface of the insulating coating 120 in the second overlapping region 122. Typically, the positions of the tabs 210 on both sides of the electrode assembly 20 are adapted to the first body portion and the second body portion, that is, the tabs 210 on both sides can be located at the lower part of the first body portion and the second body portion respectively.

[0123] The ratio of the height B of the second overlapping area 122 to the height b of the body 312 needs to meet a certain range. If this ratio, B / b, is too small, the portion of the insulating coating 120 covering the body 312 will be small, and the tab 210 will easily extend beyond the insulating coating 120 after being closed, resulting in a higher risk of insulation failure. If this ratio, B / b, is too large, it will affect the welding effect of the housing 10 and the cover plate 30. For example, after the housing 10 and the cover plate 30 are welded, the insulating coating 120 may show slight burns, the welding yield will decrease, and the first plastic part 301 will be close to the cover plate body 303, affecting the welding of the housing 10 and the cover plate 30.

[0124] Therefore, the inventors discovered that by limiting B / b to the following range: 25% ≤ B / b ≤ 75%, the risk of insulation failure can be reduced, the welding effect of the housing 10 and the cover plate 30 can be guaranteed, the welding yield can be improved, and the burning of the insulating coating 120 can be reduced or avoided. This allows the insulation test of the cell (electrode assembly) to pass normally, and the insulating coating 120 does not show any burning after the housing 10 and the cover plate 30 are welded, and the welding yield is normal.

[0125] Optionally, in the thickness direction of the battery, the first plastic part 301 includes a support portion 311, and the insulating coating 120 includes a third overlapping region 123 covering the support portion 311. The height of the third overlapping region 123 is K, and the height of the support portion 311 is k, wherein K and k satisfy: 15% ≤ K / k ≤ 85%.

[0126] Similarly, the height of the third overlapping region 123 can also be understood as the distance K between the bottom surface of the support 311 and the upper surface of the insulating layer in the third overlapping region 123. The ratio of the height K of the third overlapping region 123 to the height k of the support 311 needs to meet a certain range. The inventors have found that by limiting K / k to the following range: 15% ≤ K / k ≤ 85%, the risk of insulation failure can be reduced, the welding effect of the housing 10 and the cover plate 30 can be guaranteed, the welding yield can be improved, and the burning of the insulating coating 120 can be reduced or avoided. This allows the insulation test of the cell (electrode assembly) to pass normally, and the insulating coating 120 does not show burning after the housing 10 and the cover plate 30 are welded, and the welding yield is normal.

[0127] The specific values ​​of the height 'a' of the support portion 311 and the height 'b' of the main body portion 312 can be selected and set according to actual conditions, and are not specifically limited in this application. The height 'A' of the first overlapping area 121 mainly refers to the distance between the bottom surface of each support portion 311 and the upper surface of the insulating coating 120, and the height 'B' of the second overlapping area 122 mainly refers to the distance between the bottom surface of each main body portion 312 and the upper surface of the insulating coating 120. The specific values ​​of A and B can be selectively adjusted according to the settings of a and b, as long as 15% ≤ A / a ≤ 85% and 25% ≤ B / b ≤ 75% are satisfied, without limiting the purpose of this application.

[0128] In some embodiments, the electrode assembly 20 is provided with tabs 210, which are electrically connected to the cover plate 30. Exemplarily, the electrode assembly 20 is provided with a first tab and a second tab, which are spaced apart in the length direction, and are respectively electrically connected to the cover plate 30. In the length direction, the length of the second overlapping region 122 is greater than or equal to the length of the body portion 312, and the length of the second overlapping region 122 is greater than the length of the first tab; and / or, in the length direction, the length of the second overlapping region 122 is greater than or equal to the length of the body portion 312, and the length of the second overlapping region 122 is greater than the length of the second tab.

[0129] In the longitudinal direction, the length of the second overlapping region 122 can be equal to the length of the body portion 312, or it can be greater than the length of the first body portion. Preferably, the length of the second overlapping region 122 exceeds, i.e., is greater than, the length of the first body portion. Similarly, the length of the second overlapping region 122 can be equal to the length of the second body portion, or it can be greater than the length of the second body portion. Preferably, the length of the second overlapping region 122 exceeds, i.e., is greater than, the length of the second body portion. In this way, the welding effect of the housing 10 and the cover plate 30 can be guaranteed, the welding yield can be improved, and the burning of the insulating coating 120 can be reduced or avoided, enabling the insulation test of the cell (electrode assembly) to pass normally.

[0130] In some embodiments, in the length direction of the battery, the length of the second overlapping region 122 is denoted as C0, the length of the body portion 312 is denoted as C1, and the length of the tab 210 is denoted as C2; C0, C1, and C2 satisfy: 110%C2≤C0≤1000%C1.

[0131] The inventors discovered that by limiting C0 to the following range: 110%C2≤C0≤1000%C1, the length C0 of the second overlapping region 122 can be prevented from being too small. This avoids a smaller portion of the insulating coating 120 covering the first plastic part 301, making it easier for the tab 210 to overlap with the housing 10 beyond the insulating coating 120, resulting in a high risk of insulation failure. Furthermore, limiting C0 to the above range ensures the welding effect between the housing 10 and the cover plate 30, improves the welding yield, and reduces or avoids burns to the insulating coating 120. It also ensures that the insulation test of the battery cell (electrode assembly) passes normally, and that no burns appear on the insulating coating 120 after welding the housing 10 and the cover plate 30, indicating a normal welding yield.

[0132] The batteries mentioned in the embodiments of this application may include one or more battery cells as a single physical module to provide higher voltage and capacity. For example, the batteries mentioned in this application may include battery modules or battery packs. Batteries generally include a housing for encapsulating one or more battery cells or multiple battery modules. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0133] To meet different power needs, a battery can include multiple battery cells, which can be connected in series, parallel, or in a mixed manner. A mixed manner refers to a combination of series and parallel connections.

[0134] In this application, the battery can be a secondary battery or a primary battery; it can also be a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this embodiment is not limited in this regard. The battery can be flat, cuboid, or other shapes, and this embodiment is not limited in this regard either.

[0135] [Electrical appliances]

[0136] In some embodiments, an electrical device is provided, the electrical device comprising:

[0137] The electrical device body; and the aforementioned battery that is electrically connected to the electrical device body.

[0138] The solutions in this application can be applied to batteries, but are not limited to battery cells, battery modules, or battery packs, and can also be applied to electrical devices that include battery cells, battery modules, or battery packs.

[0139] The batteries disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0140] As an example, the electrical device can be a vehicle, which can be a new energy vehicle, such as a pure electric vehicle, a hybrid electric vehicle, or a range-extended vehicle.

[0141] Similarly, the embodiments of the electrical device provided in this application include an electrical device body and a battery as described in the above embodiments that is electrically connected to the electrical device body. Therefore, the electrical device in this embodiment also includes at least all the beneficial effects that the battery in the above embodiments can achieve.

[0142] The present application will be further described below with reference to specific embodiments and comparative examples.

[0143] Example 1

[0144] The battery includes a housing 10, an electrode assembly 20, and a cover plate 30. The housing 10 includes a housing body 110 and an insulating coating 120. The housing body 110 includes a bottom wall and a side wall. The side wall surrounds the bottom wall, with one end connected to the bottom wall and the other end forming an opening 111. The side wall and the bottom wall together define a receiving cavity for accommodating the electrode assembly 20. The insulating coating 120 is attached to the bottom wall and the side wall. The insulating coating 120 is formed by coating and serves to separate the bottom wall from the bottom surface of the electrode assembly 20, and to separate the side wall from the side surface of the electrode assembly 20. The electrode assembly 20 is disposed in the receiving cavity of the housing 10, and both the bottom surface and the side surface of the electrode assembly 20 are in contact with the insulating coating 120. In this embodiment, the insulating coating 120 overlaps with at least a portion of the first plastic part 301 (hereinafter referred to as the lower plastic part) in the cover plate 30 in the height direction. For example, the insulating coating 120 covers at least a portion of the lower plastic part in the height direction, thereby creating an overlap area between them.

[0145] The first plastic part 301 includes multiple support sections 311 and multiple body sections 312. The insulating coating 120 has a first overlapping region 121 covering at least a portion of the support section 311 and a second overlapping region 122 covering at least a portion of the body section 312.

[0146] The height of each support portion 311 is a, the height of each first overlapping region 121 is A, the height of each body portion 312 is b, and the height of each second overlapping region 122 is B; in the thickness direction of the battery, the first plastic part 301 includes the support portion 311, and the insulating coating 120 includes a third overlapping region 123 covering the support portion 311; the height of the third overlapping region 123 is K, and the height of the support portion 311 is k.

[0147] The electrode assembly 20 is provided with a tab 210, which is electrically connected to the cover plate 30; in the length direction of the battery, the length of the second overlapping area 122 is denoted as C0, the length of the body 312 is denoted as C1, and the length of the tab 210 is denoted as C2.

[0148] In this embodiment, A = 0.75 mm, a = 5 mm, and A / a = 15.00%.

[0149] K=0.75mm, k=5mm, K / k=15.00%;

[0150] B=0.75mm, b=3mm, B / b=25.00%;

[0151] C0=33mm, C1=35mm, C2=30mm, C0 / C1=94.29%, C0 / C2=110.00%.

[0152] Example 2

[0153] This embodiment is basically the same as embodiment 1, except for some parameters. The relevant parameters in this embodiment are as follows:

[0154] A=1mm, a=5mm, A / a=20.00%;

[0155] K=1mm, k=5mm, K / k=20.00%;

[0156] B=1mm, b=3mm, B / b=33.33%;

[0157] C0=30mm, C1=35mm, C2=30mm, C0 / C1=85.71%, C0 / C2=100.00%.

[0158] Example 3

[0159] This embodiment is basically the same as embodiment 1, except for some parameters. The relevant parameters in this embodiment are as follows:

[0160] A=1.5mm, a=5mm, A / a=30.00%;

[0161] K=1.5mm, k=5mm, K / k=30.00%;

[0162] B=1.25mm, b=3mm, B / b=41.67%;

[0163] C0=70mm, C1=35mm, C2=30mm, C0 / C1=200.00%, C0 / C2=233.33%.

[0164] Example 4

[0165] This embodiment is basically the same as embodiment 1, except for some parameters. The relevant parameters in this embodiment are as follows:

[0166] A=2mm, a=5mm, A / a=40.00%;

[0167] K=2mm, k=5mm, K / k=40.00%;

[0168] B=1.5mm, b=3mm, B / b=50.00%;

[0169] C0=90mm, C1=35mm, C2=30mm, C0 / C1=257.14%, C0 / C2=300.00%.

[0170] Example 5

[0171] This embodiment is basically the same as embodiment 1, except for some parameters. The relevant parameters in this embodiment are as follows:

[0172] A=2.5mm, a=5mm, A / a=50.00%;

[0173] K=2.5mm, k=5mm, K / k=50.00%;

[0174] B=1.7mm, b=3mm, B / b=56.67.00%;

[0175] C0=100mm, C1=35mm, C2=30mm, C0 / C1=285.71%, C0 / C2=333.33%.

[0176] Example 6

[0177] This embodiment is basically the same as embodiment 1, except for some parameters. The relevant parameters in this embodiment are as follows:

[0178] A=3mm, a=5mm, A / a=60.00%;

[0179] K=3mm, k=5mm, K / k=60.00%;

[0180] B=1.9mm, b=3mm, B / b=63.33%;

[0181] C0=120mm, C1=35mm, C2=30mm, C0 / C1=342.86%, C0 / C2=400.00%.

[0182] Example 7

[0183] This embodiment is basically the same as embodiment 1, except for some parameters. The relevant parameters in this embodiment are as follows:

[0184] A=3.5mm, a=5mm, A / a=70.00%;

[0185] K=3.5mm, k=5mm, K / k=70.00%;

[0186] B=2.1mm, b=3mm, B / b=70.00%;

[0187] C0=150mm, C1=35mm, C2=30mm, C0 / C1=428.57%, C0 / C2=500.00%.

[0188] Example 8

[0189] This embodiment is basically the same as embodiment 1, except for some parameters. The relevant parameters in this embodiment are as follows:

[0190] A=4mm, a=5mm, A / a=80.00%;

[0191] K=4mm, k=5mm, K / k=80.00%;

[0192] B=2.2mm, b=3mm, B / b=73.33%;

[0193] C0=200mm, C1=35mm, C2=30mm, C0 / C1=571.43%, C0 / C2=666.67%.

[0194] Example 9

[0195] This embodiment is basically the same as embodiment 1, except for some parameters. The relevant parameters in this embodiment are as follows:

[0196] A=4.25mm, a=5mm, A / a=85.00%;

[0197] K=4.25mm, k=5mm, K / k=85.00%;

[0198] B=2.25mm, b=3mm, B / b=75.00%;

[0199] C0=300mm, C1=35mm, C2=30mm, C0 / C1=857.14%, C0 / C2=1000.00%.

[0200] Example 10

[0201] This embodiment is basically the same as embodiment 1, except for some parameters. The relevant parameters in this embodiment are as follows:

[0202] A=1mm, a=2mm, A / a=50.00%;

[0203] K=1mm, k=2mm, K / k=50.00%;

[0204] B=1mm, b=2mm, B / b=50.00%;

[0205] C0=400mm, C1=40mm, C2=20mm, C0 / C1=1000.00%, C0 / C2=2000.00%.

[0206] Example 11

[0207] This embodiment is basically the same as embodiment 1, except for some parameters. The relevant parameters in this embodiment are as follows:

[0208] A=2mm, a=4mm, A / a=50.00%;

[0209] K=2mm, k=4mm, K / k=50.00%;

[0210] B=2mm, b=4mm, B / b=50.00%;

[0211] C0=100mm, C1=55mm, C2=50mm, C0 / C1=181.82%, C0 / C2=200.00%.

[0212] Example 12

[0213] This embodiment is basically the same as embodiment 1, except for some parameters. The relevant parameters in this embodiment are as follows:

[0214] A=3mm, a=7mm, A / a=42.86%;;

[0215] K=3mm, k=7mm, K / k=42.86%;

[0216] B=3mm, b=7mm, B / b=42.86%;

[0217] C0=150mm, C1=80mm, C2=70mm, C0 / C1=187.50%, C0 / C2=214.29%.

[0218] Comparative Example 1

[0219] This comparative example is basically the same as Example 1, except for some parameters. The relevant parameters in this comparative example are as follows:

[0220] A=0.25mm, a=5mm, A / a=5.00%;

[0221] K=0.25mm, k=5mm, K / k=5.00%;

[0222] B=0.15mm, b=3mm, B / b=5.00%;

[0223] C0=25mm, C1=35mm, C2=30mm, C0 / C1=71.43%, C0 / C2=83.33%.

[0224] Comparative Example 2

[0225] This comparative example is basically the same as Example 1, except for some parameters. The relevant parameters in this comparative example are as follows:

[0226] A=5mm, a=5mm, A / a=100.00%;

[0227] K=5mm, k=5mm, K / k=100.00%;

[0228] B=3mm, b=3mm, B / b=100.00%;

[0229] C0=25mm, C1=35mm, C2=30mm, C0 / C1=71.43%, C0 / C2=83.33%.

[0230] The batteries of Examples 1-12 and Comparative Examples 1-2 were characterized by actual welding tests and insulation tests to determine whether the ratio settings were appropriate.

[0231] The results show that in Examples 1-12, when A / a is limited to the following range: 15% ≤ A / a ≤ 85%, the cell insulation test is OK, and the insulating coating 120 after welding the housing 10 and the cover plate 30 does not show any burns, indicating a normal welding yield. However, in Comparative Example 1, A / a is 5%, resulting in a smaller portion of the insulating coating 120 covering the first plastic part 301, leading to a higher risk of insulation failure. In Comparative Example 2, A / a is 100%. Although the cell insulation test is OK, the insulating coating 120 after welding the housing 10 and the cover plate 30 shows slight burns, resulting in a decreased welding yield. The plastic part is also closer to the cover plate 30, affecting the welding of the housing 10 and the cover plate 30.

[0232] Similarly, in Examples 1-12, K / k was limited to the following range: 15% ≤ K / k ≤ 85%. The results showed that the cell insulation test was OK, and the insulating coating 120 did not show any burns after welding the housing 10 and cover plate 30, indicating a normal welding yield. However, in Comparative Example 1, K / k was 5%, resulting in a smaller portion of the insulating coating 120 covering the first plastic part 301, leading to a higher risk of insulation failure. In Comparative Example 2, K / k was 100%. Although the cell insulation test was OK, the insulating coating 120 showed slight burns after welding the housing 10 and cover plate 30, resulting in a decreased welding yield. The plastic part was also closer to the cover plate 30, affecting the welding of the housing 10 and cover plate 30.

[0233] Similarly, in Examples 1-12, the B / b ratio was limited to the range of 25% ≤ B / b ≤ 75%. The results showed that the cell insulation test was OK, and the insulating coating 120 did not show any burns after welding the housing 10 and cover plate 30, indicating a normal welding yield. However, in Comparative Example 1, the B / b ratio was 5%, resulting in a smaller portion of the insulating coating 120 covering the first plastic part 301, leading to a higher risk of insulation failure. In Comparative Example 2, the B / b ratio was 100%. Although the cell insulation test was OK, the insulating coating 120 showed slight burns after welding the housing 10 and cover plate 30, resulting in a decreased welding yield. The plastic part was also closer to the cover plate 30, affecting the welding of the housing 10 and cover plate 30.

[0234] In addition, in Examples 1-12, C0 / C2 were all ≥110.00%, indicating that the cell insulation test was OK, and the insulating coating 120 did not show any burns after welding the casing 10 and the cover plate 30, indicating a normal welding yield (the insulating coating 120 needs to cover the tab 210). However, in Comparative Examples 1 and 2, C0 / C2 were both 83.33%, indicating that the portion of the insulating coating 120 covering the first plastic part 301 was small, and the tab 210 was prone to overlap with the casing 10 beyond the insulating coating 120, resulting in a high risk of insulation failure.

[0235] The parts of this invention not described in detail are techniques known to those skilled in the art.

[0236] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0237] It should be noted that the terms "and / or" or " / " used herein are merely descriptions of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The singular forms "a," "described," and "the" used in the embodiments of the invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0238] In the description of the embodiments of this application, the technical terms "length", "width", "inner", "outer", "top", "bottom", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0239] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0240] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A housing for accommodating an electrode assembly, characterized in that, The housing includes: The housing body includes a bottom wall and a side wall, the side wall surrounds the bottom wall and one end of the side wall is connected to the bottom wall, the other end of the side wall forms an opening, and the side wall and the bottom wall together define a receiving cavity for accommodating the electrode assembly. An insulating coating is attached to the bottom wall and the side wall, the insulating coating being formed by coating, for separating the bottom wall from the bottom surface of the electrode assembly, and separating the side wall from the side surface of the electrode assembly.

2. The housing according to claim 1, characterized in that, The thickness of the insulating coating is 50μm to 200μm; And / or, the distance between the upper edge of the insulating coating and the opening is ≥0.1mm; And / or, along the length of the housing, the upper edge of the insulating coating has a raised and recessed structure, or the upper edge of the insulating coating is straight.

3. The housing according to claim 1, characterized in that, The insulating coating includes at least one of a fluoropolymer coating, a polymer-ceramic composite coating, or a resin coating.

4. The housing according to claim 3, characterized in that, The fluoropolymer coating comprises a fluoropolymer and an additive, wherein the fluoropolymer comprises at least one of polyvinylidene fluoride, polytetrafluoroethylene, polyethylene-tetrafluoroethylene, or polyvinyl fluoride. And / or, the polymer-ceramic composite coating comprises a polymer, a ceramic material, and additives, wherein the polymer comprises at least one of fluorinated polyimide, fluorinated polyamide, polyvinylidene fluoride, or polytetrafluoroethylene, and the ceramic material comprises at least one of alumina, zirconium oxide, yttrium oxide, magnesium oxide, cobalt oxide, chromium oxide, or zinc oxide; And / or, the resin coating includes a resin, a curing agent, and additives, wherein the resin includes an epoxy resin.

5. The housing according to any one of claims 1 to 4, characterized in that, The insulating coating on the bottom wall directly abuts against the bottom surface of the electrode assembly, so that the bottom of the housing does not contain a base plate.

6. A battery, characterized in that, The battery includes: The housing as described in any one of claims 1 to 5; An electrode assembly is disposed within the housing, and the bottom and side surfaces of the electrode assembly are in contact with the insulating coating. A cover plate that closes onto the opening of the housing.

7. The battery according to claim 6, characterized in that, The cover plate includes a cover plate body and a first plastic part disposed on the lower side of the cover plate body; The first plastic part includes at least one support portion and at least one body portion. In a preset direction, the height of the support portion is higher than the height of the body portion. The preset direction represents the height direction of the battery. Along the length of the battery, the insulating coating has a first overlapping region covering at least a portion of the support portion, and / or the insulating coating has a second overlapping region covering at least a portion of the body portion.

8. The battery according to claim 7, characterized in that, The first plastic part includes multiple support sections and multiple body sections, and the support sections are provided at both ends of the first plastic part; In the preset direction, the height of each segment of the support is a, and the height of each segment of the first overlapping area is A, wherein A and a satisfy: 15% ≤ A / a ≤ 85%; And / or, in a preset direction, the height of each segment of the main body is b, and the height of each segment of the second overlapping area is B, wherein B and b satisfy: 25% ≤ B / b ≤ 75%.

9. The battery according to claim 7 or 8, characterized in that, The electrode assembly is provided with tabs, and the tabs are electrically connected to the cover plate; Along the length of the battery, the length of the second overlapping region is denoted as C0, the length of the main body is denoted as C1, and the length of the tab is denoted as C2. The C0, C1, and C2 satisfy the following condition: 110%C2≤C0≤1000%C1.

10. An electrical device, characterized in that, The electrical device includes: The main body of the electrical appliance; and The battery as described in any one of claims 6 to 9 is electrically connected to the main body of the electrical device.

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