Housing assembly, battery, battery module and electric device

Abstract

The application provides a shell assembly, a battery, a battery module and an electric device, and relates to the technical field of batteries. The shell assembly comprises a shell, a pole is arranged on the side of the shell away from the cavity, a first glue layer is arranged between the shell and the pole, the pole is provided with a pressure relief assembly, the pressure relief assembly comprises a pressure relief piece and a second glue layer, the second glue layer is arranged between the pressure relief piece and the pole, and at least part of the second glue layer is arranged around the pressure relief hole to seal the pressure relief hole. The melting point temperature of the second glue layer is lower than that of the first glue layer, when the temperature of the second glue layer reaches the melting point temperature of the second glue layer, the second glue layer melts to generate a pressure relief channel between the pressure relief piece and the pole, and the pressure relief channel is communicated with the pressure relief hole and the outside of the shell. The shell assembly, the battery, the battery module and the electric device provided by the application solve the problem that the installation layout of the circuit assembly is affected by the pressure relief assembly.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a housing assembly, a battery, a battery module, and an electrical device. Background Technology

[0002] During use, batteries may experience thermal runaway due to overcharging, over-discharging, or other abnormal conditions, leading to a rapid increase in internal pressure. In such cases, the battery casing may expand or even rupture, potentially causing a battery explosion.

[0003] In existing technologies, a pressure relief channel is typically provided on the battery casing to connect the inside and outside of the casing, and this channel is sealed by a pressure relief component. When the internal pressure of the battery casing reaches a certain threshold, the pressure relief component automatically opens, connecting the inside and outside of the battery casing, allowing excess gas to be released from inside the battery into the external environment, thereby reducing the internal pressure of the battery casing.

[0004] However, placing a pressure relief component in the battery casing would affect the installation layout of the circuit components. Utility Model Content

[0005] This application provides a housing assembly, a battery, a battery module, and an electrical device to solve the problem of pressure relief components affecting the installation layout of circuit components.

[0006] In a first aspect, this application provides a housing assembly, comprising:

[0007] A housing having a cavity, wherein the housing has a first through hole communicating with the cavity;

[0008] A pole post is connected to the side of the housing away from the cavity. The pole post is used for electrical connection with the electrode core and is provided with a pressure relief hole.

[0009] A first adhesive layer is at least partially disposed between the housing and the electrode post and connects the housing and the electrode post. The first adhesive layer is provided with a clearance opening, which connects the first through hole and the pressure relief hole.

[0010] A pressure relief assembly includes a pressure relief component and a second adhesive layer. The pressure relief assembly is disposed on the side of the electrode post away from the housing. The pressure relief component covers the pressure relief hole. The second adhesive layer is disposed between the pressure relief component and the electrode post. At least a portion of the second adhesive layer is wrapped around the periphery of the pressure relief hole and connects the pressure relief component and the electrode post to seal the pressure relief hole.

[0011] The melting point temperature of the second adhesive layer is lower than that of the first adhesive layer. When the temperature of the second adhesive layer reaches its melting point, the second adhesive layer melts to create a pressure relief channel between the pressure relief component and the pole post. The pressure relief channel connects the pressure relief hole and the outside of the housing.

[0012] As an optional implementation, the melting point temperature of the first adhesive layer is greater than or equal to 150°C;

[0013] The melting point of the second adhesive layer is greater than or equal to 100°C and less than 150°C.

[0014] As an optional implementation, the thickness of the first adhesive layer is greater than or equal to 0.04 mm and less than or equal to 0.5 mm;

[0015] And / or, the thickness of the second adhesive layer is greater than or equal to 0.04 mm and less than or equal to 0.5 mm.

[0016] As an optional implementation, the first adhesive layer includes a plurality of first sub-connecting layers stacked along the thickness direction, wherein the melting point of the first sub-connecting layers is higher than the melting point of the second adhesive layer;

[0017] And / or, the second adhesive layer includes a plurality of second sub-connecting layers stacked along the thickness direction, at least one of the second sub-connecting layers having a melting point lower than that of the first adhesive layer.

[0018] As an optional implementation, the pressure relief assembly includes a connector connected to the side of the second adhesive layer opposite to the pressure relief assembly. The connector is fixedly connected to the pole. The connector has a second through hole communicating with the pressure relief hole. At least a portion of the second adhesive layer is wrapped around the periphery of the second through hole to seal the second through hole.

[0019] As an optional implementation, in the thickness direction of the second adhesive layer, the pressure relief member has a first projection on the pole post, the second adhesive layer has a second projection on the pole post, and the connector has a third projection on the pole post;

[0020] The outer edge contour of the first projection is located within the outer edge contour of the third projection, and the outer edge contour of the second projection is located within the outer edge contour of the third projection.

[0021] As an optional implementation, the second projection and the third projection have a first overlapping region, and the minimum distance between the inner edge and the outer edge of the first overlapping region is greater than or equal to 0.5 mm.

[0022] As an optional implementation, the second adhesive layer is provided with a third through hole, the third through hole communicating with the first through hole, and the pressure relief component covering the third through hole;

[0023] The first projection and the second projection have a second overlapping region, and the minimum distance between the inner edge and the outer edge of the second overlapping region is greater than or equal to 0.5 mm.

[0024] As an optional implementation, the pole includes a first portion, and the pressure relief hole is disposed in the first portion.

[0025] As an optional implementation, the first portion is disposed on the side close to the width direction of the housing.

[0026] As an optional implementation, the first part is provided with a mounting groove recessed towards the housing on the side opposite to the first adhesive layer, and the pressure relief hole is provided at the bottom of the mounting groove;

[0027] The pressure relief assembly includes a connector connected to the side of the second adhesive layer opposite to the pressure relief assembly, and at least a portion of the connector is embedded in the mounting groove.

[0028] As an optional implementation, the sidewall of the connector is welded to the inner sidewall of the mounting groove to form a molten pool.

[0029] As an optional implementation, in the thickness direction of the second adhesive layer, the ratio of the thickness of the molten pool to the thickness of the connector is greater than or equal to 0.7 and less than or equal to 1.

[0030] And / or, in the radial direction of the mounting groove, the width of the molten pool is greater than or equal to 0.08 mm and less than or equal to 0.17 mm.

[0031] As an optional implementation, the pole includes a second portion;

[0032] The second part is connected to the first part, and a conductive part is provided on the side of the second part facing the housing, the conductive part being used to electrically connect with the electrode core.

[0033] As an optional implementation, the first part and the second part are arranged sequentially along the width direction of the housing.

[0034] As an optional implementation, the surface of the second part facing away from the housing is set as a plane;

[0035] The surface of the second portion facing the housing is set as a plane, and the conductive portion is formed on the surface of the second portion facing the housing.

[0036] As an optional implementation, the surface of the second part facing away from the housing is set as a plane;

[0037] The second part has a protrusion on the side facing the housing. Part of the protrusion passes through the first through hole and extends into the cavity. The sidewall of the protrusion is spaced apart from the sidewall of the first through hole. The protrusion forms the conductive part.

[0038] As an optional implementation, the second part is provided with a molded shape protruding towards the housing, part of the molded shape passing through the first through hole and extending into the cavity, the molded shape being spaced apart from the sidewall of the first through hole, and the molded shape forming the conductive part.

[0039] As an optional implementation, the first through hole includes a first connecting port and a second connecting port that are independently provided;

[0040] The first communication port is connected to the pressure relief hole;

[0041] The second connection port is used to bypass the pole post so that at least a portion of the pole post is electrically connected to the pole core.

[0042] As an optional implementation, the clearance opening includes a first connecting portion and a second connecting portion that are independently provided;

[0043] The first connecting portion is connected to the pressure relief hole;

[0044] The second connecting portion is used to avoid the pole post so that at least a portion of the pole post is electrically connected to the pole core.

[0045] As an optional implementation, in the thickness direction of the first adhesive layer, the pole post has a fourth projection on the housing, and the first adhesive layer has a fifth projection on the housing;

[0046] The outer edge contour of the fourth projection is located within the outer edge contour of the fifth projection.

[0047] As an optional implementation, the minimum distance between the outer peripheral edge of the fourth projection and the outer peripheral edge of the fifth projection is greater than or equal to 0.5 mm.

[0048] As an optional implementation, the housing includes a frame and a cover plate;

[0049] The cover plate is provided over the end opening of the frame, and the frame and the cover plate form the cavity;

[0050] The frame includes a first sidewall, which is disposed adjacent to the cover plate, and the extending direction of the first sidewall is parallel to the width direction of the housing.

[0051] The first through hole is disposed on the first sidewall, and the first through hole is located near the end of the first sidewall extending in the direction of extension.

[0052] Secondly, this application provides a battery including an electrode core and any of the above-mentioned housing components. The electrode core is disposed in the cavity of the housing of the housing component, and the electrode core is provided with a tab, which is connected to the terminal post.

[0053] Thirdly, this application provides a battery module, including any of the above-mentioned housing components or any of the above-mentioned batteries.

[0054] Fourthly, this application provides an electrical device including any of the above-mentioned housing components, or any of the above-mentioned batteries, or any of the above-mentioned battery modules.

[0055] The housing assembly, battery, battery module, and electrical device provided in this application include a housing, a terminal post disposed on the side of the housing away from the cavity, a first adhesive layer disposed between the housing and the terminal post, and a pressure relief assembly disposed on the terminal post. The pressure relief assembly includes a pressure relief element and a second adhesive layer, which is disposed between the pressure relief element and the terminal post. At least a portion of the second adhesive layer is wrapped around the pressure relief hole to seal the pressure relief element and the terminal post. The melting point temperature of the second adhesive layer is lower than that of the first adhesive layer. When the temperature of the second adhesive layer reaches its melting point temperature, the second adhesive layer melts to create a pressure relief channel between the pressure relief element and the terminal post. The pressure relief channel connects the pressure relief hole and the outside of the housing.

[0056] By integrating the pressure relief assembly into the terminal post, the number of components that need to be independently distributed on the casing is reduced. This minimizes the impact of the pressure relief assembly on the layout of the circuit components, allowing the circuit components to connect more directly to the terminal post without having to bypass the dispersed pressure relief assembly. This layout optimizes space utilization, improves the flexibility and rationality of circuit component installation, simplifies the internal structural design of the battery, and enables a more compact overall battery design. Attached Figure Description

[0057] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0058] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of this application;

[0059] Figure 2 for Figure 1 Top view of the battery;

[0060] Figure 3 for Figure 2 Sectional view of the battery along point AA Figure 1 ;

[0061] Figure 4 for Figure 3 Exploded view of the middle casing, poles, and pressure relief assembly;

[0062] Figure 5 for Figure 2 Sectional view of the battery along point AA Figure 2 ;

[0063] Figure 6 for Figure 5 Exploded view of the middle casing, poles, and pressure relief assembly;

[0064] Figure 7 for Figure 2 Sectional view of the battery along point AA Figure 3 ;

[0065] Figure 8 for Figure 7 Exploded view of the middle casing, poles, and pressure relief assembly;

[0066] Figure 9 An exploded view of the pressure relief assembly in the housing assembly provided in this application embodiment;

[0067] Figure 10 A schematic diagram of the third overlapping region of the fourth and fifth projections in the housing assembly provided in the embodiments of this application. Figure 1 ;

[0068] Figure 11 A schematic diagram of the third overlapping region of the fourth and fifth projections in the housing assembly provided in the embodiments of this application. Figure 2 .

[0069] Explanation of reference numerals in the attached figures:

[0070] 100. Shell; 101. First through hole; 1011. First connecting port; 1012. Second connecting port; 103. Cavity

[0071] 110. Frame;

[0072] 120. Cover plate;

[0073] 200, pole;

[0074] 210. First part; 211. Pressure relief hole; 212. Mounting slot;

[0075] 220. Part Two; 221. Conductive Part;

[0076] 300. Pressure relief assembly;

[0077] 310. Second adhesive layer; 311. Third through hole;

[0078] 320. Pressure relief components;

[0079] 330. Connector; 331. Second through hole;

[0080] 400, First adhesive layer;

[0081] 410. Clearance opening; 411. First connecting part; 412. Second connecting part;

[0082] 500, Extreme Core;

[0083] 510. Polar ear;

[0084] 600, First overlapping region;

[0085] 700, Second overlapping region;

[0086] 800, the third overlapping region.

[0087] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0088] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0089] In the embodiments of this application, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing the embodiments of this application and their implementations, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. For those skilled in the art, the specific meaning of these terms in the embodiments of this application can be understood according to the specific circumstances.

[0090] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0091] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0092] In this application, the terms "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplarily" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0093] As described in the background section, batteries may experience thermal runaway during use due to overcharging, over-discharging, or other abnormal conditions, leading to a rapid increase in internal pressure. In such cases, the battery casing may expand or even rupture, potentially causing a battery explosion.

[0094] In existing technologies, a pressure relief channel is typically provided on the battery casing to connect the inside and outside of the casing, and this channel is sealed by a pressure relief component. When the internal pressure of the battery casing reaches a certain threshold, the pressure relief component automatically opens, connecting the inside and outside of the battery casing, allowing excess gas to be released from inside the battery into the external environment, thereby reducing the internal pressure of the battery casing.

[0095] To simplify manufacturing processes and optimize assembly procedures, pressure relief components and terminal structures are typically located on the same side of the battery and spaced apart.

[0096] The terminal structure is a key component of a battery, enabling energy input and output as well as circuit connections. The scattered distribution of the pressure relief assembly and terminal structure on the same side of the battery presents challenges for the installation layout of surrounding circuit components. During installation, circuit components must consider effective connection to the terminal structure while avoiding the pressure relief assembly to prevent interference with its normal function. This limits the flexibility and rationality of circuit component installation and increases the complexity of the battery's internal structural design.

[0097] In view of the above, embodiments of this application provide a housing assembly, a battery, a battery module, and an electrical device. The housing assembly includes: a housing having a cavity, the housing having a first through hole communicating with the cavity; a terminal post disposed on the side of the housing away from the cavity, the terminal post being used for electrical connection with the electrode core, the terminal post having a pressure relief hole; a first adhesive layer disposed between the housing and the terminal post and connecting the housing and the terminal post, the first adhesive layer having a clearance opening communicating with the first through hole and the pressure relief hole; and a pressure relief assembly including a pressure relief component and a second adhesive layer, the pressure relief assembly being disposed on the side of the terminal post away from the housing, the pressure relief component covering the pressure relief hole, the second adhesive layer being disposed between the pressure relief component and the terminal post, at least a portion of the second adhesive layer being wrapped around the pressure relief hole and connecting the pressure relief component and the terminal post to seal the pressure relief hole.

[0098] By integrating the pressure relief assembly into the terminal post, the number of components that need to be independently distributed on the casing is reduced. This minimizes the impact of the pressure relief assembly on the layout of the circuit components, allowing the circuit components to connect more directly to the terminal post without having to bypass the dispersed pressure relief assembly. This layout optimizes space utilization, improves the flexibility and rationality of circuit component installation, simplifies the internal structural design of the battery, and enables a more compact overall battery design.

[0099] Furthermore, integrating the pressure relief component into the terminal post allows for a more efficient design within a limited space. Without affecting the space available for the circuit components, the area of ​​the first adhesive layer can be expanded around the terminal post. This expansion enhances the mechanical connection strength between the terminal post and the casing, improves connection reliability and electrical insulation performance, thereby further improving the overall structural stability of the battery.

[0100] The melting point of the second adhesive layer is lower than that of the first adhesive layer. When the temperature of the second adhesive layer reaches its melting point, the second adhesive layer melts to create a pressure relief channel between the pressure relief component and the pole. The pressure relief channel connects the pressure relief hole and the outside of the housing.

[0101] By utilizing the melting point difference between the first and second adhesive layers, the second adhesive layer melts first when the internal temperature of the battery rises abnormally. Under the pressure difference between the inside and outside of the battery, the molten second adhesive layer can form a pressure relief channel between the pressure relief component and the terminal post, rapidly releasing excess gas. This mechanism ensures sensitive pressure relief, prevents the battery casing from expanding or rupturing, and greatly improves the battery's safety performance.

[0102] During the pressure relief process, the first adhesive layer does not melt, ensuring effective connection and electrical insulation between the terminal and the casing. Due to the stability of the first adhesive layer, the battery's electrical performance and safety are not affected by the pressure relief process, thus reducing potential safety risks caused by pressure relief and effectively guaranteeing the battery's long-term reliability and safety.

[0103] The technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0104] Combination Figures 1 to 4 As shown, a first aspect of this application provides a housing assembly, including a housing, an electrode post, a first adhesive layer, and a pressure relief assembly. The housing 100 has a cavity 103, and the housing 100 has a first through hole 101 communicating with the cavity 103; the electrode post 200 is disposed on the side of the housing 100 away from the cavity 103, and the electrode post 200 is used for electrical connection with an electrode core 500, and the electrode post 200 has a pressure relief hole 211; the first adhesive layer 400 is disposed between the housing 100 and the electrode post 200 and connects the housing 100 and the electrode post 200, and the first adhesive layer 400 has a clearance opening 410. The first through hole 101 and the pressure relief hole 211 are connected; the pressure relief assembly 300 includes a pressure relief component 320 and a second adhesive layer 310. The pressure relief assembly 300 is disposed on the side of the pole post 200 away from the housing 100. The pressure relief component 320 covers the pressure relief hole 211. The second adhesive layer 310 is disposed between the pressure relief component 320 and the pole post 200. At least a portion of the second adhesive layer 310 is wrapped around the periphery of the pressure relief hole 211 and connects the pressure relief component 320 and the pole post 200 to seal the pressure relief hole 211.

[0105] By integrating the pressure relief assembly 300 into the terminal post 200, the number of components that need to be independently distributed on the housing 100 can be reduced, and the impact of the pressure relief assembly 300 on the layout of the circuit components can be minimized. This allows the circuit components to connect more directly to the terminal post 200 without having to bypass the dispersed pressure relief assembly 300. This layout optimizes space utilization, improves the flexibility and rationality of circuit component installation, simplifies the internal structural design of the battery, and makes the overall battery design more compact.

[0106] Furthermore, integrating the pressure relief component 300 into the terminal post 200 allows for a more efficient design within a limited space. Since the terminal post 200 needs to connect to the pressure relief component 300, its area can be expanded without affecting the space available for the circuit components, thereby increasing the connection area between the terminal post 200 and the first adhesive layer 400. This expansion enhances the mechanical connection strength between the terminal post 200 and the housing 100, improves connection reliability and electrical insulation performance, and further enhances the overall structural stability of the battery.

[0107] Specifically, when the terminal 200 is connected to the housing 100, a three-layer structure consisting of part of the terminal 200, the first adhesive layer 400, and the sidewall of the housing 100 is stacked. The first adhesive layer 400 is disposed between the terminal 200 and the housing 100, which facilitates the stable installation of the terminal 200 on the housing 100. Compared with the riveting structure, it also helps to reduce the space occupied inside the battery. Furthermore, the first adhesive layer 400 can effectively block the electrical connection between the terminal 200 and the housing 100, while providing better sealing.

[0108] Understandably, the pressure relief component 320 is located on the side of the second adhesive layer 310 away from the pole post 200, and is used to seal the pressure relief hole 211.

[0109] By adding a pressure relief component 320 to the pressure relief assembly 300 and wrapping the second adhesive layer 310 around the pressure relief hole 211, the gap between the pressure relief component 320 and the terminal post 200 can be effectively sealed, improving the sealing effect of the pressure relief hole 211, preventing gas leakage, and also preventing dust or other external contaminants from entering the interior of the housing 100 from the pressure relief hole 211, thereby improving the stability and safety of the battery in the non-pressure relief state.

[0110] The pressure relief component 320 can be a metal sheet, such as an aluminum sheet, a steel sheet, or a titanium alloy sheet.

[0111] Specifically, the melting point temperature of the second adhesive layer 310 is lower than that of the first adhesive layer 400. When the temperature of the second adhesive layer 310 reaches its melting point temperature, the second adhesive layer 310 melts to create a pressure relief channel between the pressure relief component 320 and the pole post 200. The pressure relief channel connects the pressure relief hole 211 and the outside of the housing 100.

[0112] Understandably, during battery thermal runaway, the temperature inside the cavity 103 of the casing 100 will rise, which will cause the temperature of the casing 100 to rise. Heat will be transferred from the casing 100 to the outside and reach the first adhesive layer 400, the terminal post 200 and the pressure relief assembly 300, causing the temperature of the first adhesive layer 400, the terminal post 200 and the pressure relief assembly 300 to rise as well.

[0113] When the temperature of the second adhesive layer 310 reaches the melting point temperature of the second adhesive layer 310, the second adhesive layer 310 can melt and soften. Due to the high internal air pressure of the housing 100, a channel for gas flow can be formed in the melted and softened second adhesive layer 310 under the action of the internal air pressure of the housing 100. This channel is located between the pressure relief component 320 and the pole post 200, and can connect the pressure relief hole 211 and the outside of the housing 100, and can serve as a pressure relief channel.

[0114] In practice, the high-temperature gas inside the housing 100 can be discharged to the outside of the housing 100 through the first through hole 101, the clearance port 410, the pressure relief hole 211 and the pressure relief channel in sequence, thereby realizing the pressure relief of the battery.

[0115] Specifically, by utilizing the melting point difference between the first adhesive layer 400 and the second adhesive layer 310, when the temperature inside the cavity 103 of the casing rises abnormally, heat is transferred to the second adhesive layer 310. When the temperature of the second adhesive layer 310 reaches its melting point, it melts. Under the pressure difference between the inside and outside of the battery, a pressure relief channel is formed in the molten second adhesive layer 310 to quickly release excess gas inside the casing 100. This mechanism ensures the sensitivity and reliability of pressure relief, prevents the battery casing 100 from expanding or rupturing, and greatly improves the safety performance of the battery.

[0116] During the pressure relief process, the first adhesive layer 400 does not melt, which ensures the effective connection and electrical insulation between the terminal 200 and the casing 100. Due to the stability of the first adhesive layer 400, the electrical performance and safety of the battery are not affected by the pressure relief process, thereby reducing potential safety risks caused by pressure relief and effectively ensuring the long-term reliability and safety of the battery.

[0117] For example, the first adhesive layer 400 can be made of thermoplastic materials such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, polycarbonate, and polyphenylene ether. The second adhesive layer 310 can be made of thermoplastic materials such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, polycarbonate, and polyphenylene ether.

[0118] For example, the first adhesive layer 400 can be connected to the pole 200 and the housing 100 by a hot-pressing process. The second adhesive layer 310 can be connected to the pressure relief component 320 by a hot-pressing process.

[0119] It should be noted that the pressure relief assembly 300 can also be other forms of pressure relief structure, such as a mechanical pressure relief valve, which seals the pressure relief orifice 211 through a sealing diaphragm or valve. When the internal pressure of the housing 100 exceeds a set threshold, the pressure can push the sealing diaphragm to rupture or the spring valve to open, allowing gas to escape. By integrating this pressure relief structure into the pole 200, the number of components that need to be independently distributed on the housing 100 can also be reduced, thereby reducing the impact of the pressure relief assembly 300 on the layout of the circuit components.

[0120] In some embodiments, the melting point temperature of the first adhesive layer 400 is greater than or equal to 150°C; the melting point temperature of the second adhesive layer 310 is greater than or equal to 100°C and less than 150°C.

[0121] Understandably, during the depressurization process, when the temperature reaches the melting point of the second adhesive layer 310, the depressurization channel formed by the second adhesive layer 310 can depressurize the cavity 103. Therefore, the temperature inside the cavity 103 will not get out of control and rise further. As a result, the temperature of the shell 100 is unlikely to reach the melting point of the first adhesive layer 400, so the first adhesive layer 400 will not melt. This ensures the effective connection and electrical insulation between the electrode and the shell 100.

[0122] Therefore, due to the stability of the first adhesive layer 400, the electrical performance and safety of the battery will not be affected by the pressure relief process, thereby reducing the potential safety risks caused by pressure relief and effectively ensuring the long-term reliability and safety of the battery.

[0123] In some embodiments, the thickness of the first adhesive layer 400 is greater than or equal to 0.04 mm and less than or equal to 0.5 mm.

[0124] By controlling the thickness of the first adhesive layer 400, the necessary insulation effect can be provided for the pole post 200 and the housing 100. At the same time, the stacking height of the components in the thickness direction Z of the first adhesive layer 400 can also be controlled to maintain the compactness of the housing components.

[0125] In some embodiments, the thickness of the second adhesive layer 310 is greater than or equal to 0.04 mm and less than or equal to 0.5 mm.

[0126] By controlling the thickness of the second adhesive layer 310, an effective connection can be provided for the pressure relief component 320 and the connector 330. At the same time, the stacking height of the pressure relief assembly 300 in the thickness direction Z of the first adhesive layer 400 can be controlled to maintain the compactness of the housing assembly.

[0127] In some embodiments, the first adhesive layer 400 includes a plurality of first sub-connecting layers stacked along the thickness direction Z, the melting point of the first sub-connecting layers being higher than the melting point of the second adhesive layer 310.

[0128] The first adhesive layer 400 is configured to be composed of multiple first sub-connecting layers stacked together. The material properties and thickness of each layer can be adjusted according to specific needs to optimize the overall performance of the first adhesive layer 400.

[0129] During the hot pressing process, the lower melting point first sub-connecting layer can flow and fill better, thereby enhancing interlayer adhesion and sealing. Therefore, the lower melting point first sub-connecting layer can be disposed on the side of the first adhesive layer 400 near the electrode post 200 and on the side of the first adhesive layer 400 near the housing 100, to improve the connection stability between the first adhesive layer 400 and the electrode post 200, and between the first adhesive layer 400 and the housing 100.

[0130] If the melting point of the first sub-connecting layer is higher than that of the second adhesive layer 310, then under the condition of battery thermal runaway, the first adhesive layer 400 can maintain its structure and insulation performance, preventing short circuit between the terminal post 200 and the casing 100 caused by thermal melting.

[0131] It should be noted that the melting point of the multiple first sub-connecting layers of the first adhesive layer 310 is higher than that of the second adhesive layer 310, which can ensure that the battery is depressurized at the pressure relief component 300.

[0132] Specifically, when the internal temperature and pressure of the battery rise, the second adhesive layer 310 will melt first, forming a pressure relief channel, thereby releasing pressure at the pressure relief component 300.

[0133] Furthermore, during the battery depressurization process, the first sub-connecting layer in the first adhesive layer 310 remains solid and does not melt, which can effectively prevent the battery from being depressurized accidentally through the first adhesive layer 400, thereby avoiding the risk of short circuit between the terminal post 200 and the casing 100.

[0134] In some embodiments, the second adhesive layer 310 includes a plurality of second sub-connecting layers stacked along the thickness direction Z, and at least one of the second sub-connecting layers has a melting point lower than that of the first adhesive layer 400.

[0135] The second adhesive layer 310 can be configured to be composed of multiple second sub-connecting layers stacked together. The material properties and thickness of each layer can also be adjusted according to specific needs to optimize the overall performance of the second adhesive layer 310.

[0136] During the hot pressing process, the lower melting point second sub-connector layer can flow and fill better, thereby enhancing interlayer adhesion and sealing. Therefore, the lower melting point second sub-connector layer can be disposed on the side of the second adhesive layer 310 near the pressure relief member 320, and on the side of the second adhesive layer 310 near the connector 330, to improve the connection stability between the second adhesive layer 310 and the pressure relief member 320, and between the second adhesive layer 310 and the connector 330.

[0137] If at least one second sub-connector layer has a melting point lower than that of the first adhesive layer (400°C), then under battery thermal runaway conditions, the second sub-connector layer can rapidly melt and soften to form the necessary pressure relief channel, ensuring the timeliness and effectiveness of battery pressure relief.

[0138] Combination Figure 3 and Figure 4 As shown, in some embodiments, the pressure relief assembly 300 includes a connector 330 connected to the side of the second adhesive layer 310 away from the pressure relief component 320. The connector 330 is fixedly connected to the pole post 200. The connector 330 has a second through hole 331 communicating with the pressure relief hole 211. At least a portion of the second adhesive layer 310 is wrapped around the periphery of the second through hole 331 to seal the second through hole 331, thereby achieving a seal on the pressure relief hole 211.

[0139] If a connector 330 is provided on the side of the second adhesive layer 310 away from the pressure relief component 320, the second adhesive layer 310, the connector 330 and the pressure relief component 320 can be connected by a hot pressing process to form an integral structure, and then the integral structure can be welded to the pole post 200, which simplifies the assembly process.

[0140] Specifically, the pole post 200, the first adhesive layer 400 and the housing 100 can be connected together by another hot pressing process to form an integral structure, and the pressure relief component 300 can be welded to this integral structure.

[0141] This connection method, which involves heat-pressing the two components separately before assembling them, simplifies the assembly process and avoids the impact of multiple heat presses on the connection quality of the first adhesive layer 400 or the second adhesive layer 310. This allows the pressure relief component 300 to effectively seal the pressure relief hole 211, ensuring stability and safety in the non-pressure relief state.

[0142] For example, the connector 330 of the pressure relief assembly 300 and the pole post 200 can be connected by laser penetration welding or edge welding to achieve a seal at the connection between the pressure relief hole 211 and the second through hole 331.

[0143] It should be noted that the housing 100, connector 330, and pole post 200 can all be made of metal materials, such as stainless steel, titanium alloy, nickel alloy, chromium alloy, or aluminum alloy. When the connector 330 and pole post 200 are made of the same material, the welding quality between them can be improved.

[0144] It should also be noted that the pressure relief assembly 300 may also omit the connector 330. The pole post 200, the first adhesive layer 400 and the housing 100 can be heat-pressed together, and the second adhesive layer 310 can be heat-pressed together with the pressure relief component 320. Then, the second adhesive layer 310 can be connected to the pole post 200 by adhesive-assisted connection or laser welding. This can also effectively seal the pressure relief hole 211 and ensure stability and safety in non-pressure relief state.

[0145] Combination Figure 9 As shown, in some embodiments, in the thickness direction Z of the second adhesive layer 310, the pressure relief member 320 has a first projection on the pole post 200, the second adhesive layer 310 has a second projection on the pole post 200, and the connector 330 has a third projection on the pole post 200; the outer edge contour of the first projection is located within the outer edge contour of the third projection.

[0146] By controlling the outer edge contour of the first projection to be within the range of the outer edge contour of the third projection, that is, the pressure relief component 320 does not exceed the area where the connector 330 is located, it can be ensured that the pressure relief component 320 does not protrude from the outer edge of the connector 330, which helps to avoid the pressure relief component 320 affecting the welding effect between the connector 330 and the pole post 200.

[0147] Furthermore, the outer edge contour of the second projection is located within the outer edge contour of the third projection. By controlling the outer edge contour of the second projection to be within the range of the outer edge contour of the third projection, that is, the second adhesive layer 310 does not exceed the area where the connector 330 is located, it can be ensured that the second adhesive layer 310 does not protrude from the outer edge of the connector 330. On the one hand, this ensures that the connector 330 can be smoothly installed on the pole post 200, and on the other hand, it also avoids the second adhesive layer 310 from affecting the connection effect between the side wall of the connector 330 and the inner side wall of the mounting groove 212.

[0148] Combination Figure 9 As shown, in some embodiments, the second projection and the third projection have a first overlapping region 600, and the minimum distance between the inner edge and the outer edge of the first overlapping region 600 is greater than or equal to 0.5 mm.

[0149] It should be noted that the inner edge of the first overlapping area 600 is the projected edge corresponding to the second through hole 331 of the connector 330. The outer edge of the first overlapping area 600 is the outer contour edge of the second projection.

[0150] The second adhesive layer 310 may have a third through hole 311 communicating with the second through hole 331. When the second adhesive layer 310 has the second through hole 331, the inner edge of the first overlapping area 600 is the projected edge corresponding to the larger of the diameters of the second through hole 331 and the third through hole 311.

[0151] The area of ​​the first overlapping region 600 is the connection area between the connector 330 and the second adhesive layer 310.

[0152] By controlling the distance between the inner and outer edges of the first overlapping area 600 of the second and third projections, sufficient effective connection area can be ensured between the connector 330 and the second adhesive layer 310 to ensure the structural stability of the pressure relief assembly 300, while ensuring the sealing effect of the pressure relief assembly 300 on the pressure relief hole 211, thereby improving the safety of the battery.

[0153] In some embodiments, the second adhesive layer 310 is provided with a third through hole 311, the first projection and the second projection have a second overlapping region 700, and the minimum distance between the inner edge of the second overlapping region 700 and the outer edge of the second overlapping region 700 is greater than or equal to 0.5 mm.

[0154] It should be noted that the inner edge of the second overlapping region 700 is the projected edge corresponding to the third through hole 311 of the second adhesive layer 310. The outer edge of the first overlapping region 600 is the outer contour edge of the projection of the smaller outer diameter of the second adhesive layer 310 and the pressure relief component 320.

[0155] The area of ​​the second overlapping region 700 is the connection area between the second adhesive layer 310 and the pressure relief component 320.

[0156] By controlling the distance between the inner and outer edges of the second overlapping area 700 of the first and second projections, the pressure relief component 320 and the second adhesive layer 310 can have a sufficient effective connection area to ensure the structural stability of the pressure relief assembly 300, while ensuring the sealing effect of the pressure relief assembly 300 on the pressure relief hole 211 and improving the safety of the battery.

[0157] Specifically, by controlling the overlap of the projections of each layer in the pressure relief assembly 300, effective coverage between the layers can be ensured, and a tight bond can be ensured between the pressure relief component 320, the second adhesive layer 310 and the connector 330, thereby enhancing the stability and sealing of the pressure relief assembly 300.

[0158] It should be noted that the outer edge contour of the first projection can be within the range of the outer edge contour of the second projection, or the outer edge contour of the second projection can be within the range of the outer edge contour of the first projection, as long as the effective connection area between the pressure relief component 320 and the second adhesive layer 310 can be guaranteed, and the stability and sealing of the pressure relief assembly 300 can also be guaranteed.

[0159] In some embodiments, the second adhesive layer 310 is provided with a third through hole 311, which communicates with the first through hole 101. The pressure relief component 320 covers the third through hole 311, and the third through hole 311 can communicate with the pressure relief hole 211 through the second through hole 331.

[0160] By providing a third through hole 311 in the second adhesive layer 310, when the connector 330, the second adhesive layer 311 and the pressure relief component 320 are hot-pressed and then welded to the first part 21, the amount of molten adhesive layer entering the pressure relief hole 211 can be reduced, ensuring that the pressure relief hole 211 has a larger communication area and improving the pressure relief speed.

[0161] It should be noted that the second adhesive layer 310 may not have the third through hole 311. With this configuration, the second adhesive layer 310 can completely cover the pressure relief hole 211, which helps to simplify the assembly process and enhances the connection effect with the pressure relief component 320 and the connector 330, ensuring the integrity and sealing of the pressure relief assembly 300.

[0162] Combination Figures 3 to 8 As shown, in some embodiments, the pole post 200 includes a first portion 210, and a pressure relief hole 211 is disposed in the first portion 210.

[0163] Understandably, the first part 210 is a component specifically designed on the terminal post 200 to integrate a pressure relief channel, which facilitates the integration of the pressure relief assembly 300 into the terminal post 200 without affecting the electrical connection between the terminal post 200 and the external circuit components of the battery, as well as the internal electrode core 500 of the battery.

[0164] Furthermore, the pressure relief hole 211 can also be used as a liquid injection hole, and the first part 210 can also integrate a liquid injection channel. When the pressure relief hole 211 is used as a liquid injection hole, the sealing effect of the liquid injection hole can be achieved simultaneously after the pressure relief assembly 300 is installed. This configuration can further reduce the number of components that need to be independently distributed on the housing 100, optimize space utilization, make the overall battery design more compact, and reduce the impact of the liquid injection hole on the layout of circuit components.

[0165] In some embodiments, the first portion 210 is disposed on the side near the width direction X of the housing 100.

[0166] The first part 210 is located on the side near the width direction X of the housing 100, that is, the edge of the first part 210 near the width direction X of the housing 100. This helps to form a large flat space in the width direction X of the surface of the housing 100, which facilitates the installation of circuit components and simplifies the assembly process.

[0167] In addition, the first part 210 is close to the edge of the housing 100, and the corresponding pressure relief hole 211 is also close to the edge of the housing 100. When the battery thermal runaway requires pressure relief, the high temperature and high pressure airflow can be ejected from the edge of the battery instead of from the center area facing the circuit assembly, which can improve the safety of the pressure relief path.

[0168] Combination Figure 3 and Figure 4 As shown, in some embodiments, the first portion 210 has a mounting groove 212 recessed towards the housing 100 on the side opposite to the first adhesive layer 400, and a pressure relief hole 211 is provided at the bottom of the mounting groove 212. At least a portion of the connector 330 is embedded in the mounting groove 212.

[0169] Understandably, the mounting slot 212 provides space to accommodate the pressure relief assembly 300, which helps to achieve a compact housing assembly and thus optimizes the spatial layout of the battery.

[0170] Specifically, by providing a mounting groove 212 on the first part 210, the connector 330 can be embedded therein, reducing the stacking height of the terminal post 200 and the pressure relief assembly 300 in the thickness direction Z of the first adhesive layer 400, thereby reducing the overall height of the first adhesive layer 400, the terminal post 200 and the pressure relief assembly 300 on the surface of the housing 100, which helps to achieve the compactness of the housing assembly and improve the space utilization and energy density of the battery.

[0171] The pressure relief hole 211 is located at the bottom of the mounting groove 212. When the connector 330 is embedded in the mounting groove 212, the pressure relief hole 211 can be aligned with the second through hole 331 of the connector 330 to ensure smooth and effective pressure relief.

[0172] In some embodiments, the sidewall of the connector 330 is welded to the inner sidewall of the mounting groove 212 to form a molten pool.

[0173] The connector 330 is housed in the mounting groove 212, and the side wall of the connector 330 and the inner side wall of the mounting groove 212 can be connected together by laser splicing welding. The weld mark formed is the molten pool, which is located at the edge of the connector 330.

[0174] Compared to laser penetration welding or edge welding, splicing welding can better accommodate the thickness of the connector 330, while reducing the penetration depth and thus lowering the welding energy. This reduces the impact of welding heat on surrounding materials, especially the first adhesive layer 400, preventing its failure and ensuring the sealing performance of the housing assembly.

[0175] In some embodiments, in the thickness direction Z of the second adhesive layer 310, the ratio of the thickness of the molten pool to the thickness of the connector 330 is greater than or equal to 0.7 and less than or equal to 1. In the radial direction of the mounting groove 212, the width of the molten pool is greater than or equal to 0.08 mm and less than or equal to 0.17 mm.

[0176] By limiting the thickness and width of the molten pool, the connection between the connector 330 and the sidewall of the mounting groove 212 can be made firm, with high connection strength, while avoiding thermal defects and ensuring the quality of the weld.

[0177] It should be noted that the connector 330 and the first part 210 can also be connected in other ways, which can provide better connection stability and sealing, while reducing the impact on the first adhesive layer 400 and the second adhesive layer 310.

[0178] Combination Figures 3 to 8 As shown, in some embodiments, the pole post 200 includes a second portion 220; the second portion 220 is connected to the first portion 210, and a conductive portion 221 is provided on the side of the second portion 220 facing the housing 100, the conductive portion 221 being used for electrical connection with the pole core 500.

[0179] Understandably, the second part 220 is a component on the pole 200 for conductive connection, for electrical connection simultaneously with the pole core 500 located inside the housing 100 and the circuit assembly located outside the battery.

[0180] In a specific implementation, the side of the second part 220 facing away from the housing 100 is used to be electrically connected to the circuit components outside the battery, and the conductive part 221 provided on the side of the second part 220 facing the housing 100 is used to be electrically connected to the electrode core 500 inside the battery.

[0181] In some embodiments, the first portion 210 and the second portion 220 are arranged sequentially along the width direction X of the housing 100, and the second portion 220 is located away from the edge of the first portion 210 in the width direction X of the housing 100.

[0182] Understandably, the first part 210 is closer to the edge of the housing 100, while the second part 220 is relatively farther away from the edge of the housing 100. With this arrangement, the second part 220 can be closer to the circuit components on the battery, making the wiring shorter and more direct.

[0183] Especially for thin, hard-shell batteries, their... Figure 1 The thickness in the Y direction is relatively small, and the arrangement of the first part 210 and the second part 220 can make good use of the narrow space on the side of the battery.

[0184] The side wall of housing 100, apart from the areas where the first part 210 and the second part 220 are installed, provides a flat installation space for the circuit components. This avoids the conventional pressure relief valve and liquid injection hole sealing components being located in the middle of the side wall and protruding from the side wall, which would affect the installation layout of the circuit components and help simplify the assembly of the circuit components.

[0185] In some embodiments, the surface of the second portion 220 facing away from the housing 100 is set as a plane; the surface of the second portion 220 facing the housing 100 is set as a plane, and a conductive portion 221 is formed on the surface of the second portion 220 facing the housing 100.

[0186] The second part 220 is set in a flat form on the side opposite to the housing 100, which can provide a flat connection surface for external circuit components, increase the welding process window with the circuit components, facilitate the welding operation with the circuit components, and improve the reliability and efficiency of welding.

[0187] The second part 220, facing the surface of the housing 100, serves as a conductive part 221, which is directly used to connect to the electrode core 500 without extending into the cavity 103. This reduces the space occupied by the cavity 103, allowing more space in the cavity 103 to be used to accommodate the electrode core 500 or electrolyte, which helps to improve the mass energy density and volumetric energy density of the battery.

[0188] Understandably, the surface of the second part 220 facing away from the housing 100 and the surface facing the housing 100 are both flat, which simplifies the overall structure of the pole post 200 and makes the pole post 200 easier to process and shape.

[0189] Specifically, the first part 210 and the second part 220 are an integral structure.

[0190] The integrated structure of the first part 210 and the second part 220 eliminates the additional contact resistance caused by welding or other connection methods, ensuring the excellent conductivity of the electrode 200. Furthermore, the integrated structure avoids potential welding fatigue, corrosion, or leakage problems between the first part 210 and the second part 220, making the overall rigidity and reliability of the electrode 200 higher than that of a separate welded structure. In addition, the integrated structure is simple to manufacture; for example, the first part 210 and the second part 220 with different thicknesses and shapes can be directly machined onto a single metal sheet using processes such as stamping or etching.

[0191] Combination Figure 7 and Figure 8As shown, in some embodiments, the surface of the second part 220 facing away from the housing 100 is set as a plane; the second part 220 is provided with a protrusion on the side facing the housing 100, and part of the protrusion extends into the cavity 103 through the first through hole 101. The sidewall of the protrusion is spaced apart from the sidewall of the first through hole 101, and the protrusion forms a conductive part 221.

[0192] The second part 220, on the side facing away from the housing 100, is designed as a flat surface, providing a smooth connection surface for external circuit components and facilitating soldering operations. Furthermore, the first part 210 has a larger soldering process window with the circuit components, which helps simplify the soldering process and improve soldering reliability and efficiency.

[0193] By providing a protrusion as a conductive part 211 on the side of the second part 220 facing the housing 100, and extending part of the protrusion through the first through hole 101 to the inside of the housing 100, the conductive part 211 has a larger volume in the inside of the housing 100, which can increase the welding surface between the pole post 200 and the tab 510 in the pole core 500, increase the welding process window, and facilitate the connection between the tab 510 and the pole post 200.

[0194] A gap is provided between the sidewall of the protrusion and the sidewall of the first through hole 101, that is, the conductive part 221 does not contact the sidewall of the first through hole 101, which ensures electrical insulation between the conductive part 221 and the housing 100 and avoids possible short circuit risks.

[0195] It should be noted that, in combination Figure 7 As shown, insulating or sealing material (such as extending part of the first adhesive layer 400 into the first through hole 101) can be filled in the gap between the side wall of the protrusion and the side wall of the first through hole 101 to isolate the protrusion and the housing 100 and further prevent them from contacting and short-circuiting.

[0196] Combination Figures 3 to 6 As shown, in some embodiments, the second part 220 is provided with a molded part protruding into the housing 100. Part of the molded part extends into the cavity 103 through the first through hole 101. The molded part is spaced apart from the side wall of the first through hole 101, and the molded part forms a conductive part 221.

[0197] It should be noted that the pressing process is a three-dimensional structure protruding towards the housing 100, formed on the second part 220 through a stamping or pressing process. After the pressing extends to the cavity 103 through the first through hole 101, it can form a cantilevered conductive sheet above the tab 510 of the electrode core 500.

[0198] When the die is pressed and connected to the tab 510, the laser beam can directly irradiate the overlapping area of ​​the conductive sheet and the tab 510 from the outside of the battery, so as to achieve the connection between the post 200 and the tab 510 through external laser welding. This ensures the precise positioning and firmness of the welding, reduces the risk of poor welding, and avoids the problems of beam obstruction, splash contamination and expansion of the heat-affected zone caused by the traditional solution of needing to penetrate the laser into the battery.

[0199] The conductive part 221 is spaced apart from the side wall of the first through hole 101, meaning that the conductive part 221 does not contact the side wall of the first through hole 101, thus ensuring electrical insulation between the conductive part 221 and the housing 100 and avoiding possible short circuit risks.

[0200] For example, in a cross section perpendicular to the thickness direction Z of the first adhesive layer 400, the shape of the molded part can be rectangular or circular.

[0201] Specifically, a portion of the first adhesive layer 400 can extend into the first through hole 101 to fill the gap between the sidewall of the molded part and the sidewall of the first through hole 101, thereby further improving the electrical insulation effect between the conductive part 221 and the housing 100.

[0202] Combination Figure 4 As shown, in some embodiments, the first through hole 101 includes a first connecting port 1011 and a second connecting port 1012 that are independently provided; the first connecting port 1011 is connected to the pressure relief hole 211; the second connecting port 1012 is used to avoid the pole post 200 so that at least a portion of the pole post 200 is electrically connected to the pole core 500.

[0203] By setting the first through hole 101 as an independently existing first connecting port 1011 and second connecting port 1012, a first adhesive layer 400 can be provided in the solid part between the two, which helps to increase the area of ​​the first adhesive layer 400, improve the sealing reliability of the housing assembly, and also improve the connection effect between the pole post 200 and the housing 100.

[0204] Specifically, the second connection port 1012 is used to avoid the conductive part 221 of the electrode post 200. The second connection port 1012 can provide a separate channel for the conductive part 221, allowing it to extend to the inside of the housing 100 and connect with the electrode core 500 inside the housing 100.

[0205] The first connecting port 1011 forms part of the battery pressure relief path, ensuring the smoothness of the pressure relief path. When the battery is depressurized, the gas inside the casing 100 is discharged to the outside of the casing 100 through the first connecting port 1011, the clearance port 410, the pressure relief hole 211, the second through hole 331, and the pressure relief channel generated by the melting of the second adhesive layer.

[0206] For example, the first connecting port 1011 can be circular, elliptical, rectangular or polygonal, etc., and the shape of the pressure relief hole 211 can be adapted to the shape of the first connecting port 1011 in order to ensure the connection area between the two.

[0207] In this embodiment, both the pressure relief hole 211 and the first connecting port 1011 can be slit-type holes. The length direction of the slit-type hole extends along the length direction of the side wall of the housing 100, so that the pressure relief hole 211 occupies less space in the width direction X of the side wall of the housing 100.

[0208] It should be noted that the first connecting port 1011 and the second connecting port 1012 can also be connected to form a larger exhaust port, which increases the cross-sectional area of ​​the exhaust path, reduces the resistance to gas flow, and thus accelerates the exhaust speed to quickly release the internal pressure of the housing 100 and improve the pressure relief efficiency.

[0209] Combination Figure 4 As shown, in some embodiments, the clearance port 410 includes a first connecting portion 411 and a second connecting portion 412 that are independently provided; the first connecting portion 411 communicates with the pressure relief hole 211; the second connecting portion 412 is used to avoid the pole post 200 so that at least a portion of the pole post 200 is electrically connected to the pole core 500.

[0210] The clearance opening 410 corresponds to the position of the first through hole 101, which can prevent the first adhesive layer 400 from affecting the connectivity between the first through hole 101 and the pressure relief hole 211, and at the same time prevent the first adhesive layer 400 from blocking the extension of the second part 220 into the housing 100.

[0211] By setting the clearance opening 410 as an independent first connecting part 411 and second connecting part 412, the sealing area of ​​the first adhesive layer 400 can be larger and the sealing reliability can be higher.

[0212] Specifically, the second connecting portion 412 is used to avoid the conductive portion 221. The conductive portion 221 extends into the housing 100 through the second connecting portion 412 and the second connecting port 1012 in sequence, so as to connect with the tab 510 inside the housing 100.

[0213] Specifically, during the battery depressurization process, the high-temperature gas inside the battery can be discharged to the outside of the casing 100 through the first connecting port 1011, the first connecting part 411, the depressurization hole 211, the second through hole 331, and the depressurization channel generated by the melting of the second adhesive layer 310.

[0214] It should be noted that, in combination Figure 6 As shown, the first connecting portion 411 and the second connecting portion 412 can also be connected, so that the clearance opening 410 forms a larger opening, which helps to simplify the processing steps of the first adhesive layer 400.

[0215] Combination Figure 4 , Figure 6 , Figure 10 and Figure 11 As shown, in some embodiments, in the thickness direction Z of the first adhesive layer 400, the pole post 200 has a fourth projection on the housing 100, and the first adhesive layer 400 has a fifth projection on the housing 100; the outer edge contour of the fourth projection is located within the outer edge contour of the fifth projection.

[0216] By controlling the outer edge contour of the fourth projection to be within the range of the outer edge contour of the fifth projection, that is, the first part 210 extends beyond the area where the first adhesive layer 400 is located, it can be ensured that the first part 210 does not protrude from the outer edge of the first adhesive layer 400, thereby ensuring that the first part 210 of the pole post 200 is within the coverage area of ​​the entire first adhesive layer 400.

[0217] This configuration ensures that the area around the pole 200 is adequately insulated, preventing electrical short circuits or other malfunctions caused by contact between the pole 200 and the housing 100.

[0218] In some embodiments, the minimum distance between the outer periphery of the fourth projection and the outer periphery of the fifth projection is greater than or equal to 0.5 mm.

[0219] It is understandable that the outer edge contour of the fourth projection is located within the outer edge contour of the fifth projection. Therefore, the minimum distance between the outer periphery of the fourth projection and the outer periphery of the fifth projection is the minimum width of the portion of the first adhesive layer 400 that protrudes from the outer periphery of the pole post 200.

[0220] By controlling the minimum width of the portion of the first adhesive layer 400 protruding from the outer periphery of the pole post 200, the first adhesive layer 400 can be effectively isolated between the pole post 200 and the housing 100, ensuring the insulation effect between the pole post 200 and the housing 100.

[0221] In some embodiments, the fourth projection and the fifth projection have a third overlapping region 800, and the minimum distance between the inner edge and the outer edge of the third overlapping region 800 is greater than or equal to 0.5 mm.

[0222] Combination Figure 4 and Figure 10 As shown, it should be noted that when the first connecting part 411 and the second connecting part 412 are not connected, the projected edge corresponding to the one with the larger inner diameter between the first connecting part 411 and the pressure relief hole 211 is as follows: Figure 10 As shown by curve L1 in the figure, the projected edge of the second connected portion 412 is as follows: Figure 10 As shown by curve L2, both curves L1 and L2 are the inner edges of the third overlapping region 800.

[0223] Combination Figure 6 and Figure 11 As shown, it should also be noted that when the first connecting part 411 and the second connecting part 412 are connected to form an integral clearance opening 410, the inner edge of the third overlapping region 800 is the projection edge corresponding to the clearance opening 410.

[0224] The outer edge of the third overlapping region 800 is the outer edge contour of the fourth projection.

[0225] The area of ​​the third overlapping region 800 is the connection area between the first part 210 and the first adhesive layer 400.

[0226] By controlling the distance between the inner edge and the outer edge of the third overlapping region 800, the effective connection area between the first part 210 and the first adhesive layer 400 can be guaranteed, improving structural stability and sealing. It can also ensure the insulation effect of the first adhesive layer 400 on the electrode post 200 and the shell 100, thereby improving the safety of the battery.

[0227] In some embodiments, the housing 100 includes a frame 110 and a cover plate 120; the cover plate 120 covers the end opening of the frame 110, and the frame 110 and the cover plate 120 form a cavity 103. The frame 110 includes a first sidewall, and the first sidewall cover plate 120 is disposed adjacent to it. The extending direction of the first sidewall is parallel to the width direction X of the housing 100. A first through hole 101 is disposed on the first sidewall, and the first through hole 101 is close to the end of the first sidewall extending in the direction of extension.

[0228] If the first through hole 101 is located near the end of the first sidewall extending in the direction of extension, the first through hole 101 can be located near a corner of the housing 100. This allows the pressure relief component 300, which is located corresponding to the first through hole 101, to also be located in a corner of the housing 100 and away from the circuit components, thus avoiding interference from the arrangement of the circuit components.

[0229] It should be noted that the first through hole 101 can also serve as a liquid injection hole for the housing 100. After the pressure relief assembly 300 is installed, the liquid injection hole can be effectively sealed. This design eliminates the need for additional liquid injection holes on other parts of the side wall of the frame 110, thus avoiding the problem of conventional pressure relief valves and liquid injection hole sealing assemblies being located in the middle of the side wall of the frame 110 and protruding from the side wall, affecting the installation layout of the circuit components. It provides a flat installation space for the circuit components and simplifies their assembly.

[0230] Specifically, frame 110 along Figure 1 Both ends of the central Y-axis have openings. The cover plate 120 may include a first cover plate and a second cover plate, which are respectively sealed and welded to the frame 110 along the Y-axis. Figure 1The openings at both ends in the Y direction. The first sidewall is located along the frame 110. Figure 1 One side in the Z direction.

[0231] A second aspect of this application provides a battery including an electrode core 500 and a housing assembly provided in any of the above embodiments. The electrode core 500 is disposed in the cavity 103 of the housing 100 of the housing assembly, and the electrode core 500 is provided with tabs 510, which are connected to terminals 200.

[0232] The housing assembly has been described in detail in the above embodiments and will not be repeated here.

[0233] It should be noted that the electrode core 500 includes a positive electrode tab and a negative electrode tab. A terminal post 200 can be provided on the housing assembly. The positive electrode tab of the electrode core 500 is connected to the terminal post 200, and the negative electrode tab of the electrode core 500 is directly connected to the housing 100.

[0234] Of course, the housing assembly can also be provided with two pole posts 200, one pole post 200 is connected to the positive pole tab of the pole core 500, and the other pole post 200 is connected to the negative pole tab.

[0235] Specifically, the tab 510 can be connected to the second part 220 of the pole post 200.

[0236] It should also be noted that the Core 500 can include either a wound structure or a stacked structure. The battery can include, but is not limited to, a hard-case battery.

[0237] By incorporating the casing assembly described in the above embodiments into the battery, the second adhesive layer 310 can rapidly melt and soften during battery thermal runaway, forming a pressure relief channel to connect the interior of the casing 100 with the outside world. This allows for the timely discharge of high-temperature gas from inside the casing 100, thereby achieving battery pressure relief and improving battery safety and long-term reliability.

[0238] A third aspect of this application provides a battery module, including a housing assembly provided in any of the above embodiments, or a battery provided in any of the above embodiments.

[0239] The housing assembly and battery have been described in detail in the above embodiments and will not be repeated here.

[0240] By setting the battery or housing assembly as described in the above embodiments in the battery module, the second adhesive layer 310 can quickly melt and soften to form a pressure relief channel when the battery thermally runs away, so as to connect the inside of the battery housing 100 with the outside world, and timely discharge the high-temperature gas inside the housing 100, thereby realizing the pressure relief of the battery and improving the safety and long-term reliability of the electrical equipment.

[0241] The fourth aspect of this application provides an electrical device, including a housing assembly provided in any of the above embodiments, a battery provided in any of the above embodiments, or a battery module provided in any of the above embodiments.

[0242] The housing assembly, battery, and battery module have been described in detail in the above embodiments and will not be repeated here.

[0243] For example, electrical devices may include, but are not limited to, mobile phones, wearable electronic products, tablets, laptops, etc.

[0244] By incorporating the housing assembly, battery, or battery module as described in the above embodiments into the electrical equipment, the second adhesive layer 310 can rapidly melt and soften during battery thermal runaway, forming a pressure relief channel to connect the inside of the battery housing 100 with the outside, promptly expelling the high-temperature gas inside the housing 100, thereby achieving battery pressure relief and improving the safety and long-term reliability of the electrical equipment.

[0245] Finally, it should be noted that those skilled in the art, upon considering the specification and practicing the application disclosed herein, will readily conceive of other embodiments of the present application. The embodiments of this application are intended to cover any variations, uses, or adaptations of the embodiments of this application that follow the general principles of the embodiments of this application and include common knowledge or customary technical means in the art not disclosed in the embodiments of this application. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the embodiments of this application are indicated by the following claims.

[0246] It should be understood that the embodiments of this application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of the embodiments of this application is limited only by the appended claims.

Claims

1. A housing assembly, characterized in that, include: The housing (100) has a cavity (103), and the housing (100) has a first through hole (101) communicating with the cavity (103); A pole post (200) is connected to the side of the housing (100) away from the cavity (103). The pole post (200) is used for electrical connection with the pole core (500). The pole post (200) is provided with a pressure relief hole (211). A first adhesive layer (400) is at least partially disposed between the housing (100) and the pole post (200) and connects the housing (100) and the pole post (200). The first adhesive layer (400) is provided with a relief opening (410), which connects the first through hole (101) and the pressure relief hole (211). A pressure relief assembly (300) includes a pressure relief component (320) and a second adhesive layer (310). The pressure relief assembly (300) is disposed on the side of the pole (200) away from the housing (100). The pressure relief component (320) covers the pressure relief hole (211). The second adhesive layer (310) is disposed between the pressure relief component (320) and the pole (200). At least a portion of the second adhesive layer (310) is wrapped around the periphery of the pressure relief hole (211) and connects the pressure relief component (320) and the pole (200) to seal the pressure relief hole (211). The melting point temperature of the second adhesive layer (310) is lower than that of the first adhesive layer (400). When the temperature of the second adhesive layer (310) reaches the melting point temperature of the second adhesive layer (310), the second adhesive layer (310) melts to create a pressure relief channel between the pressure relief member (320) and the pole post (200). The pressure relief channel connects the pressure relief hole (211) and the outside of the housing (100).

2. The housing assembly according to claim 1, characterized in that, The melting point temperature of the first adhesive layer (400) is greater than or equal to 150°C, and the melting point temperature of the second adhesive layer (310) is greater than or equal to 100°C and less than 150°C. And / or, the thickness of the first adhesive layer (400) is greater than or equal to 0.04 mm and less than or equal to 0.5 mm; And / or, the thickness of the second adhesive layer (310) is greater than or equal to 0.04 mm and less than or equal to 0.5 mm; And / or, the first adhesive layer (400) includes a plurality of first sub-connecting layers stacked along the thickness direction, the melting point of the first sub-connecting layers being higher than the melting point of the second adhesive layer (310); And / or, the second adhesive layer (310) includes a plurality of second sub-connecting layers stacked along the thickness direction, at least one of the second sub-connecting layers having a melting point lower than that of the first adhesive layer (400).

3. The housing assembly according to claim 1 or 2, characterized in that, The pressure relief assembly (300) includes a connector (330) connected to the side of the second adhesive layer (310) away from the pressure relief component (320). The connector (330) and the pole post (200) are fixedly connected. The connector (330) has a second through hole (331) that extends through the connector (330) along the thickness direction and communicates with the pressure relief hole (211). At least a portion of the second adhesive layer (310) is wrapped around the periphery of the second through hole (331) to seal the second through hole (331).

4. The housing assembly according to claim 3, characterized in that, In the thickness direction of the second adhesive layer (310), the pressure relief member (320) has a first projection on the pole post (200), the second adhesive layer (310) has a second projection on the pole post (200), and the connector (330) has a third projection on the pole post (200). The outer edge contour of the first projection is located within the outer edge contour of the third projection, and the outer edge contour of the second projection is located within the outer edge contour of the third projection.

5. The housing assembly according to claim 4, characterized in that, The second projection and the third projection have a first overlapping region (600), and the minimum distance between the inner edge and the outer edge of the first overlapping region (600) is greater than or equal to 0.5 mm. And / or, the second adhesive layer (310) is provided with a third through hole (311), the third through hole (311) communicating with the first through hole (101), and the pressure relief component (320) covering the third through hole (311); the first projection and the second projection have a second overlapping area (700), and the minimum distance between the inner edge of the second overlapping area (700) and the outer edge of the second overlapping area (700) is greater than or equal to 0.5 mm.

6. The housing assembly according to any one of claims 1-5, characterized in that, The pole post (200) includes a first part (210), and the pressure relief hole (211) is disposed in the first part (210); The first part (210) is disposed on the side near the width direction of the housing (100).

7. The housing assembly according to claim 6, characterized in that, The first part (210) has a mounting groove (212) recessed towards the housing (100) on the side opposite to the first adhesive layer (400), and the pressure relief hole (211) is located at the bottom of the mounting groove (212); The pressure relief assembly (300) includes a connector (330) connected to the side of the second adhesive layer (310) away from the pressure relief assembly (320), and at least a portion of the connector (330) is embedded in the mounting groove (212); The sidewall of the connector (330) is welded to the inner sidewall of the mounting groove (212) to form a molten pool; In the thickness direction of the second adhesive layer (310), the ratio of the thickness of the molten pool to the thickness of the connector (330) is greater than or equal to 0.7 and less than or equal to 1, and / or, in the radial direction of the mounting groove (212), the width of the molten pool is greater than or equal to 0.08 mm and less than or equal to 0.17 mm.

8. The housing assembly according to claim 6, characterized in that, The pole post (200) includes a second part (220) connected to the first part (210); The first part (210) and the second part (220) are arranged sequentially along the width direction of the housing (100); The second part (220) has a conductive part (221) on the side facing the housing (100), and the conductive part (221) is used to connect with the pole core (500).

9. The housing assembly according to claim 8, characterized in that, The surface of the second part (220) facing away from the housing (100) is set as a plane, the surface of the second part (220) facing the housing (100) is set as a plane, and the conductive part (221) is formed on the surface of the second part (220) facing the housing (100); Alternatively, the surface of the second part (220) facing away from the housing (100) is set as a plane, and the second part (220) facing the housing (100) is provided with a protrusion, part of the protrusion passes through the first through hole (101) and extends into the cavity (103), the sidewall of the protrusion is spaced apart from the sidewall of the first through hole (101), and the protrusion forms the conductive part (221); Alternatively, the second part (220) is provided with a molded shape protruding toward the housing (100), part of the molded shape passing through the first through hole (101) and extending into the cavity (103), the molded shape being spaced apart from the sidewall of the first through hole (101), and the molded shape forming the conductive part (221).

10. The housing assembly according to any one of claims 1-9, characterized in that, The first through hole (101) includes a first connecting port (1011) and a second connecting port (1012) that are independently provided. The first connecting port (1011) is connected to the pressure relief hole (211), and the second connecting port (1012) is used to avoid the pole post (200) so that at least a portion of the pole post (200) is electrically connected to the pole core (500). And / or, the clearance port (410) includes a first connecting part (411) and a second connecting part (412) that are independently provided, the first connecting part (411) communicating with the pressure relief hole (211), and the second connecting part (412) being used to avoid the pole post (200) so that at least a portion of the pole post (200) is electrically connected to the pole core (500); And / or, in the thickness direction of the first adhesive layer (400), the pole post (200) has a fourth projection on the housing (100), and the first adhesive layer (400) has a fifth projection on the housing (100); the outer edge contour of the fourth projection is located within the outer edge contour of the fifth projection, and / or, the fourth projection and the fifth projection have a third overlapping region (800), and the minimum distance between the inner edge of the third overlapping region (800) and the outer peripheral edge of the third overlapping region (800) is greater than or equal to 0.5 mm; And / or, the housing (100) includes a frame (110) and a cover plate (120); the cover plate (120) covers the end opening of the frame (110), and the frame (110) and the cover plate (120) enclose the cavity (103); the frame (110) includes a first sidewall, which is disposed adjacent to the cover plate (120), and the extension direction of the first sidewall is parallel to the width direction of the housing (100); a first through hole (101) is disposed on the first sidewall, and the first through hole (101) is close to the end of the first sidewall in the extension direction.

11. A battery, characterized in that, Includes a pole core (500) and a housing assembly as described in any one of claims 1-10; The electrode core (500) is disposed in the cavity (103) of the housing (100), and the electrode core (500) is provided with an electrode tab (510), which is connected to the electrode post (200).

12. A battery module, characterized in that, Includes the housing assembly as described in any one of claims 1-10, or the battery as described in claim 11.

13. An electrical appliance, characterized in that, It includes the housing assembly as described in any one of claims 1-10, the battery as described in claim 11, or the battery module as described in claim 12.

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