Battery shell assembly, battery and electric equipment

Abstract

The invention relates to the technical field of batteries, in particular to a battery shell assembly, a battery and electric equipment. The battery shell assembly comprises a shell and a pressure relief structure, the shell comprises a plurality of shell walls and a first side wall, at least part of the shell wall connected with the first side wall and the first side wall are integrally formed, and the first side wall is provided with a mounting hole communicated with the containing cavity; the pressure relief structure comprises a pressure relief cover and a bonding piece, and the bonding piece is connected with the pressure relief cover and the first side wall so that the pressure relief cover can be arranged in the mounting hole in a sealing and covering mode; the bonding piece is configured to be softened or melted or gasified when the temperature exceeds the preset temperature so that a gas channel can be formed between the pressure relief cover and the first side wall. According to the battery shell assembly provided by the embodiment of the invention, the pressure relief cover and the first side wall are connected through the bonding piece, when pressure relief is needed, the gas channel can be generated between the bonding piece and the first side wall for pressure relief, and compared with a pressure relief structure in a traditional battery, the battery shell assembly disclosed by the invention is high in reliability, few in component parts of the pressure relief structure and low in cost. And assembly is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery housing assembly, a battery, and an electrical device. Background Art

[0002] With the rapid development of renewable energy and electric vehicles, the safety performance of batteries has increasingly become a key technical issue of concern in the industry. During the charging and discharging process of the battery cell, certain heat will be generated. Especially in the case of thermal runaway, the gas inside the battery cell expands rapidly and the internal pressure rises sharply, which may cause the battery housing to explode or pose other safety hazards. Therefore, in order to prevent such situations from occurring, the battery housing is usually equipped with a pressure relief mechanism to effectively release the internal pressure and ensure the safe operation of the device.

[0003] In the existing technology, the pressure relief structure of the battery is usually set on the cover plate, and the cover plate and the housing are welded to enclose the electrode core. The pressure relief structure is fixedly connected to the battery cover plate. When the pressure relief structure is impacted, it will affect the fixed connection between the cover plate and the housing, and the connection strength between the cover plate and the housing will be affected.

[0004] Therefore, it is necessary to improve the above problems to change the status quo. Summary of the Invention

[0005] The present application provides a battery housing assembly, a battery, and an electrical device, which are used to solve the problem that when the pressure relief structure in the existing technology is impacted, it will affect the fixed connection between the cover plate and the housing, and the connection strength between the cover plate and the housing will be affected.

[0006] The first aspect of the present application provides a battery housing assembly, including:

[0007] A housing having an accommodation cavity, the housing includes a plurality of housing walls and a first side wall, at least part of the housing walls connected to the first side wall are integrally formed with the first side wall, and the first side wall is provided with a mounting hole communicating with the accommodation cavity; and

[0008] A pressure relief structure including a pressure relief cover and an adhesive, the adhesive is respectively connected to the pressure relief cover and the first side wall to seal the pressure relief cover on the mounting hole;

[0009] The adhesive is configured to soften or melt or vaporize when the temperature exceeds a preset temperature to generate a gas channel between the pressure relief cover and the first side wall.

[0010] In a possible implementation manner, the pressure relief structure further includes a connecting member, and the connecting member is provided with a pressure relief hole penetrating through the connecting member in its thickness direction;

[0011] The adhesive is respectively connected to the pressure relief cover and the connecting member to seal the pressure relief cover on the pressure relief hole;

[0012] The connecting member is fixedly connected to the first side wall so that the pressure relief structure seals the mounting hole.

[0013] In a possible implementation manner, in the thickness direction of the pressure relief structure, the orthographic projection of the pressure relief hole is located within the orthographic projection of the mounting hole, and / or the orthographic projection of the pressure relief hole is within the orthographic projection of the bonding member.

[0014] In a possible implementation manner, in the thickness direction of the pressure relief structure, the outer circumferential edge of the orthographic projection of the bonding member is located within the orthographic projection of the connecting member.

[0015] In a possible implementation manner, along the direction from the aperture center of the pressure relief hole to its circumferential edge, the minimum distance between the circumferential edge of the pressure relief hole and the outer circumferential edge of the bonding member is greater than or equal to 1.2 mm.

[0016] In a possible implementation manner, along the direction from the aperture center of the pressure relief hole to its circumferential edge, the minimum distance between the circumferential edge of the pressure relief hole and the circumferential edge of the pressure relief cover is greater than or equal to 1.2 mm.

[0017] In a possible implementation manner, the connection manner between the connecting member and the first side wall is welding, and a weld seam is formed.

[0018] In a possible implementation manner, the depth of the weld seam is a, and the thickness of the first side wall is b, and the following relationship is satisfied:

[0019] 0.7 ≤ a / b ≤ 1, where a and b are in the same unit;

[0020] and / or the fusion width of the weld seam ranges from [80 µm, 165 µm].

[0021] In a possible implementation manner, the bonding member and the weld seam are arranged at intervals, and along the direction from the aperture center of the pressure relief hole to its circumferential edge, the minimum distance between the outer circumferential edge of the bonding member and the weld seam is not less than 0.2 mm.

[0022] In a possible implementation manner, the connecting member and the first side wall are made of the same material.

[0023] In a possible implementation manner, in the thickness direction of the pressure relief structure, the connecting member includes two surfaces opposite to each other in the thickness direction of the pressure relief structure, and the first side wall includes two surfaces opposite to each other in the thickness direction of the pressure relief structure;

[0024] The surface of the connecting member near the pressure relief cover is coplanar with the surface of the first side wall near the pressure relief cover.

[0025] In a possible implementation manner, the thickness of the connecting member is the same as the thickness of the first side wall.

[0026] In a possible implementation manner, the minimum area of the cross-section of the pressure relief hole in the direction perpendicular to the thickness direction of the pressure relief structure is not less than 0.18 m².

[0027] In a possible implementation manner, the pressure relief hole is a strip-shaped hole;

[0028] Or, the pressure relief hole is a circular hole, and the diameter of the pressure relief hole is not less than 0.5 mm.

[0029] In a possible implementation manner, the pressure relief cover is coaxially arranged with the pressure relief hole.

[0030] In a possible implementation manner, the bonding member is a thermosensitive adhesive.

[0031] In a possible implementation manner, the bonding member is at least one of polyethylene, polyvinyl chloride, polystyrene, polyamide, polycarbonate, and polyphenylene ether.

[0032] In a possible implementation manner,

[0033] The housing includes a middle frame, and the middle frame is provided with two openings;

[0034] The housing wall includes two cover plates, and the two cover plates are fixedly connected to the middle frame to respectively close the two openings; the middle frame and the cover plates form the accommodation cavity;

[0035] The housing wall further includes a first housing wall;

[0036] The middle frame includes the first side wall and the first housing wall connected to the first side wall. The first side wall and at least one of the cover plates are integrally formed, and / or the first side wall and at least one of the first housing walls are integrally formed.

[0037] In a possible implementation manner, the middle frame is an integral part, or the middle frame and one of the cover plates are an integral part.

[0038] In a possible implementation manner, at least part of the bonding member is circumferentially arranged around the pressure relief hole, and at least part of the bonding member is clamped between the pressure relief cover and the connecting member.

[0039] In a possible implementation manner, the thickness of the adhesive member sandwiched between the pressure relief cover and the connecting member has a value range of [0.04 mm, 0.5 mm].

[0040] In a possible implementation manner, at least a part of the adhesive member is also accommodated in the pressure relief hole.

[0041] In a possible implementation manner, the pressure relief cover is disposed in fit with the connecting member, and at least a part of the adhesive member is accommodated in the pressure relief hole and connects the pressure relief cover and the connecting member respectively.

[0042] In a possible implementation manner, the adhesive member includes a connecting glue part, the connecting glue part is wound around and connected to the inner wall of the pressure relief hole, and the connecting glue part is hermetically connected to one side of the pressure relief cover close to the pressure relief hole.

[0043] In a possible implementation manner, the adhesive member further includes a fixing glue part, the fixing glue part is connected to the connecting glue part, and the fixing glue part is connected to one side of the connecting member away from the pressure relief cover.

[0044] In a possible implementation manner, the fixing glue part is disposed circumferentially around the pressure relief hole.

[0045] The second aspect of the present application provides a battery, including:

[0046] The battery housing assembly as described in any one of the above; and

[0047] An electric core, which is accommodated in the battery housing assembly.

[0048] The third aspect of the present application provides an electrical device, including the battery as described in any one of the above.

[0049] Implementing the embodiments of the present application has the following beneficial effects:

[0050] In the battery housing assembly of this embodiment, by providing an adhesive member to connect the pressure relief cover and the first side wall, when pressure relief is required, a gas channel can be generated between the adhesive member and the first side wall for pressure relief. Compared with the pressure relief structure in traditional batteries, the pressure relief structure of the present application has fewer components, is conducive to assembly, and can improve the assembly efficiency. Description of the Drawings

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0052] Figure 1 Shows a perspective view of a battery housing assembly in an embodiment of the present invention;

[0053] Figure 2 Shows an assembly schematic diagram of a battery housing assembly in an embodiment of the present invention;

[0054] Figure 3 Shows a cross-sectional view of a battery housing assembly in an embodiment of the present invention;

[0055] Figure 4 Shows an assembly schematic diagram of a battery housing assembly in another embodiment of the present invention;

[0056] Figure 5 Shows cross-sectional views of battery housing assemblies in some embodiments of the present invention;

[0057] Figure 6 Shows a schematic structural diagram of a connecting member in some embodiments of the present invention;

[0058] Reference numerals:

[0059] 10 - Battery housing assembly;

[0060] 100 - Housing; 110 - Middle frame; 111 - First side wall; 1111 - Mounting hole; 11111 - Positioning groove part; 11112 - Through groove part; 112 - First housing wall; 120 - Cover plate;

[0061] 200 - Pressure relief structure; 210 - Pressure relief cover; 220 - Connecting member; 221 - Pressure relief hole; 222 - Weld seam; 230 - Adhesive member; 231 - Connecting glue part; 232 - Fixing glue part. Detailed implementation manners

[0062] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0063] With the rapid development of renewable energy and electric vehicles, the safety performance of batteries has increasingly become a key technical issue in the industry. During the charging and discharging process of the battery cell, certain heat is generated. Especially in the case of thermal runaway, the gas inside the battery cell expands rapidly, and the internal pressure rises sharply, which may cause the battery housing to explode or pose other safety hazards. Therefore, to prevent this situation, the battery housing is usually equipped with a pressure relief mechanism to effectively release the internal pressure and ensure the safe operation of the device.

[0064] In the existing technology, the pressure relief structure of the battery is usually set on the cover plate, and the cover plate and the housing are welded to enclose the electrode core. The pressure relief structure is fixedly connected to the battery cover plate. When the pressure relief structure is impacted, it will affect the fixed connection between the cover plate and the housing, and the connection strength between the cover plate and the housing will be affected.

[0065] In view of the above problems, referring to Figures 1 to 6 As shown, the embodiment of the present invention provides a battery housing assembly 10, whose structure is more simplified and the space utilization efficiency is higher. Specifically, the battery housing assembly 10 includes a housing 100 and a pressure relief structure 200; the housing 100 is provided with a receiving cavity, the housing 100 includes a plurality of housing walls and a first side wall 111, at least part of the housing walls adjacent to the first side wall 111 are integrally formed with the first side wall 111, and the first side wall 111 is provided with a mounting hole 1111 communicating with the receiving cavity; the pressure relief structure 200 includes a pressure relief cover 210 and an adhesive 230, and the adhesive 230 is respectively connected to the pressure relief cover 210 and the first side wall 111 so that the pressure relief cover 210 is hermetically covered on the mounting hole 1111; the adhesive 230 is configured to soften or melt or vaporize when the temperature exceeds a preset temperature so as to generate a gas channel between the pressure relief cover 210 and the first side wall 111.

[0066] In the battery housing assembly 10 of this embodiment, by providing the adhesive 230 to connect the pressure relief cover 210 and the first side wall 111, when pressure relief is required, the adhesive 230 can generate a gas channel between the pressure relief cover 210 and the first side wall 111 for pressure relief. Compared with the pressure relief structure 200 in the traditional battery, the pressure relief structure 200 of the present application has fewer components, which is beneficial to assembly and can improve the assembly efficiency.

[0067] At the same time, by adopting the integral molding structure of the housing wall and the first side wall 111, this design not only simplifies the production process but also effectively improves the structural strength of the housing 100. The integral molding makes there be no additional connection points between the multiple housing walls of the first side wall 111, avoiding potential damage caused by stress concentration at the connection points. The resulting improvement not only ensures that the overall structure of the housing 100 is more stable but also enhances the impact resistance to a certain extent and reduces the risk of damage to the housing 100 in extreme use environments.

[0068] Specifically, the adhesive member 230 maintains the sealed connection between the pressure relief cover 210 and the first side wall 111 under normal circumstances, ensuring the sealing performance and structural integrity inside the battery. When abnormal high temperature or overpressure occurs, the adhesive member 230 softens, melts or vaporizes to form a gas passage for pressure relief.

[0069] The advantage of this design is that the adhesive member 230, as a buffer layer, can absorb and disperse external impact forces, preventing the impact forces from being directly transmitted to the housing 100, especially the first side wall 111 and its surrounding structures. Compared with the traditional pressure relief structure where the pressure relief device is welded or rigidly fixed to the cover plate, the impact force often directly acts on the connection between the cover plate and the housing, which may cause fatigue, rupture of the welding points or a decrease in the connection strength.

[0070] Through the adhesive member 230, the impact force is effectively "relieved", which not only protects the structural integrity of the housing 100 but also avoids the attenuation of the connection strength between the cover plate and the housing, improving the overall safety and reliability of the battery. In addition, the softening and rupture of the adhesive member 230 only occur when the preset temperature is exceeded, ensuring the structural stability during normal use and only functioning in emergency situations where pressure relief is required, balancing safety and performance. Further, the pressure relief structure 200 further includes a connecting member 220. The connecting member 220 is provided with a pressure relief hole 221 penetrating through the connecting member 220 in its thickness direction. The adhesive member 230 is respectively connected to the pressure relief cover 210 and the connecting member 220 so that the pressure relief cover 210 hermetically covers the pressure relief hole 221. The connecting member 220 and the first side wall 111 are fixedly connected to hermetically install the pressure relief structure 200 in the installation hole 1111, enabling the pressure relief structure 200 to be firmly installed in the installation hole 1111 of the battery housing.

[0071] With this arrangement, not only is the installation stability of the pressure relief structure 200 ensured, but also the overall safety of the battery housing assembly 10 is enhanced. By firmly fixing the connecting member 220 to the first side wall 111, displacement of the pressure relief structure 200 caused by vibration or impact is avoided, ensuring the reliability of the pressure relief function.

[0072] In one embodiment, in the thickness direction of the pressure relief structure 200, the orthographic projection of the pressure relief hole 221 is located within the orthographic projection of the installation hole 1111.

[0073] This design ensures that after the pressure relief cover 210 covers the pressure relief hole 221, it can fully seal the pressure relief hole 221, effectively preventing internal pressure from leaking through the pressure relief hole 221 and further enhancing the sealing performance and reliability of the entire pressure relief structure 200.

[0074] By reasonably configuring the orthographic projection relationship between the pressure relief hole 221 and the mounting hole 1111, an optimized stress distribution region is constructed. This configuration can effectively avoid the adverse impact of the pressure exerted on the pressure relief structure 200 inside the accommodation cavity on the connection strength around the mounting hole 1111. Specifically, under the action of pressure, the bonding strength between the connecting member 220 and the housing 100 will not be weakened due to pressure concentration, thus ensuring the stability of the entire pressure relief structure 200.

[0075] Specifically, referring to Figure 3 As shown, in the thickness direction of the pressure relief structure 200, the outer circumferential edge of the orthographic projection of the bonding member 230 is located within the orthographic projection of the connecting member 220.

[0076] With this setting, the bonding reliability between the pressure relief cover 210 and the connecting member 220 can be ensured. Since the coverage range of the bonding member 230 is not less than that of the pressure relief cover 210, it is easier to ensure full contact between the pressure relief cover 210 and the bonding member 230 during the assembly process, making the connection between the pressure relief cover 210 and the bonding member 230 more secure. Additionally, with the projection as a reference, the orthographic projection of the pressure relief cover 210 on the bonding member 230 is located inside the bonding member 230, or the edge of the pressure relief cover 210 is flush with the edge of the bonding member 230.

[0077] Referring to Figure 3 As shown, along the direction from the aperture center of the pressure relief hole 221 to its circumferential edge, the minimum distance between the circumferential edge of the pressure relief hole 221 and the outer circumferential edge of the bonding member 230 is greater than or equal to 1.2 mm. Along the direction from the aperture center of the pressure relief hole 221 to its circumferential edge, the minimum distance between the circumferential edge of the pressure relief hole 221 and the circumferential edge of the pressure relief cover 210 is greater than or equal to 1.2 mm.

[0078] Specifically, the minimum distance between the circumferential edge of the pressure relief hole 221 and the circumferential edge of the pressure relief cover 210 is d1, and the minimum distance between the outer edge of the bonding member 230 and the circumferential edge of the pressure relief hole 221 is d2.

[0079] In this embodiment, by controlling the dimensions of d1 and d2, the connection strength between the pressure relief cover 210 and the bonding member 230 and the sealing effect of the bonding member 230 can be ensured, and it can be guaranteed that gas can be quickly and effectively released from the pressure relief hole 221 during pressure relief, thereby reducing the pressure inside the system and preventing potential safety hazards caused by excessive air pressure.

[0080] Specifically, the layout of the pressure relief cover 210 and the bonding member 230 not only optimizes the smoothness of the pressure relief process, but also enhances the overall strength of the pressure relief structure, avoiding material fatigue caused by stress concentration. In this structure, the distance d2 between the outer edge of the bonding member 230 and the pressure relief hole 221 can protect the bonding member from melting under high temperature conditions, thus effectively forming a pressure relief channel and improving the pressure relief efficiency. Of course, the settings of d1 and d2 are specifically determined according to the sizes of the pressure relief hole 221 and the connecting member 220, which will not be elaborated here.

[0081] In one embodiment, the connecting member 220 and the housing 100 are fixedly connected by welding.

[0082] With this setting, welding, as an effective connection method, can not only provide good mechanical strength and stability, but also has strong durability and corrosion resistance. This connection method can ensure a tight contact between the connecting member 220 and the housing 100, so that the battery housing assembly 10 has better load-bearing capacity during operation. At the same time, since welding can achieve a high connection accuracy, under dynamic load conditions, it can effectively reduce stress concentration and improve the fatigue life of the device.

[0083] To enhance the welding effect of the connecting member 220, the material selection is also crucial. In this embodiment, the connecting member 220 and the housing 100 can be made of metal materials with good welding properties, such as aluminum alloy, stainless steel or titanium alloy. These materials can not only effectively resist high temperature and oxidation, but also facilitate the implementation of different welding processes, such as argon arc welding, laser welding, etc. Through these welding methods, the heat conduction performance between the connecting member 220 and the housing 100 can be further optimized, thereby improving the thermal management effect of the entire assembly.

[0084] Specifically, the connecting member 220 is connected to the first side wall 111 by welding to form a weld 222. The depth of the weld 222 is a, and the thickness of the first side wall 111 is b, and the following relationship is satisfied: 0.7 ≤ a / b ≤ 1, where a and b are in the same unit; and / or, the fusion width of the weld 222 ranges from [80 µm, 165 µm]. With this setting, the bonding firmness and strength between the connecting member 220 and the housing 100 can be optimized.

[0085] Specifically, the penetration depth of the weld 222 is controlled between 70% and 100% of the sidewall thickness, which can effectively provide sufficient connection strength while avoiding the generation of thermal defects. During the welding process, the weld width is set to 80 - 165 microns. Such parameter settings not only improve the mechanical properties of the weld but also reduce the degradation of material properties caused by thermal effects. Therefore, the high-strength connection formed by the weld 222 ensures good contact between the connecting member 220 and the housing 100, thereby enhancing the durability and use safety of the overall structure.

[0086] To further optimize the connection performance, specific welding processes such as laser welding or TIG welding can be considered during the welding process. These methods can better control the heat input of the weld, thereby reducing possible defects and deformations during welding. In addition, post-welding processes for the weld 222, such as heat treatment or surface spraying, can also effectively improve its corrosion resistance and fatigue resistance, thereby extending the overall service life of the product. The design of these specific implementation methods, while meeting the technical characteristics, enhances the reliability and safety of the weld, ensuring its excellent performance in a variety of practical application scenarios.

[0087] In this embodiment, the connecting member 220 and the housing 100 form a weld 222 by welding to ensure the strength and stability of the connection. To further improve the overall performance of the pressure relief structure 200, an adhesive member 230 is set between the pressure relief cover 210 and the connecting member 220 and is connected to these two components respectively. A certain distance is maintained between the edge of the adhesive member 230 and the weld 222. With this setting, it is possible to avoid the melting of the adhesive member 230 caused by high temperature during the welding process, thereby ensuring its adhesive performance and structural integrity.

[0088] Through this design scheme, the adhesive member 230 can not only effectively enhance the adhesive strength between the connecting member 220 and the pressure relief cover 210 but also reduce the risk of damage to the heat-affected area during the welding process. This edge spacing structure optimizes the thermal management of the weld 222, providing better guarantee for the welding quality, thereby maintaining the overall sealing performance and reliability while ensuring the mechanical strength.

[0089] Refer to Figure 3As shown, the bonding member 230 and the weld seam 222 are spaced apart. Along the direction from the aperture center of the pressure relief hole 221 to its circumferential edge, the minimum distance between the outer circumferential edge of the bonding member 230 and the weld seam 222 is not less than 0.2 mm. With this arrangement, it can be ensured that the high temperature generated during the welding process will not have a negative impact on the bonding member 230, thus effectively maintaining its bonding performance and structural integrity. Specifically, this spacing arrangement reduces the heat affected zone of the bonding material by the high temperature, ensures that the adhesive maintains its physical and chemical properties during welding, and avoids the risk of melting or performance degradation caused by the temperature rise.

[0090] By setting the minimum distance between the bonding member 230 and the weld seam 222, the structure can exhibit higher reliability and durability during both the welding process and subsequent use. The design of this structure enables the pressure relief structure 200 to maintain good functionality when subjected to external pressure or temperature changes, and effectively reduces the potential failure risk.

[0091] In one embodiment, the connecting member 220 and the housing 100 are made of the same material. This design choice effectively improves the welding strength, thereby enhancing the overall stability and durability of the entire battery housing assembly 10. The consistent material properties not only ensure the consistency of heat conduction during the welding process, but also reduce the stress concentration phenomenon that may occur during the welding process.

[0092] Specifically, when the connecting member 220 and the housing 100 are made of the same material, the fusion performance during welding will be more excellent, and the physical properties of the welded joint can be more evenly distributed, avoiding the problem of inconsistent thermal expansion coefficients caused by different materials. To a certain extent, this reduces the failure risk caused by thermal stress in the joint area, ensuring the sealing and structural integrity of the battery housing under various working conditions. At the same time, whenever the battery undergoes charge and discharge or long-term operation, the thermal deformation of the material may cause tiny cracks at the joint, and the same material can effectively adapt to similar thermal expansion, thereby reducing the probability of crack generation.

[0093] In addition, the material consistency also brings many other advantages to the subsequent production and processing processes. For example, in processes such as surface treatment and coating application, components made of the same material can avoid problems such as uneven adhesion or corrosion reactions caused by the different chemical properties of different materials. This not only improves the appearance and service life of the battery housing assembly 10, but also reduces the complexity and cost during the production process.

[0094] Specifically, the material selection of the connecting member 220 and the housing 100 should be determined according to specific design requirements. Common materials can be aluminum alloy, stainless steel, engineering plastics, etc. During the material selection process, comprehensive consideration can be given to aspects such as the battery's usage environment, operating temperature, and expected service life to determine the optimal material combination and ensure that the performance requirements are met under various conditions.

[0095] Specifically, in the thickness direction of the pressure relief structure 200, the connecting member 220 includes two surfaces facing away from each other in the thickness direction of the pressure relief structure 200, and the first side wall 111 includes two surfaces facing away from each other in the thickness direction of the pressure relief structure 200; the surface of the connecting member 220 close to the pressure relief cover 210 and the surface of the first side wall 111 close to the pressure relief cover 210 are coplanar.

[0096] With this setting, by making the connecting member 220 flush with the outer surface of the housing 100, compared with the traditional battery housing structure, the protrusion height of the battery housing assembly 10 on the side surface provided with the pressure relief structure 200 in this embodiment is lower, making the overall structure of the battery housing assembly 10 more compact; of course, in some embodiments, the thickness of the connecting member 220 can also be less than the thickness of the first side wall 111 of the housing 100. At this time, the outer surface of the connecting member 220 will be located inside the outer surface of the housing 100, further improving the compactness of the battery housing assembly 10.

[0097] Of course, in some embodiments, the connecting member 220 can also protrude from the outer surface of the housing 100. Nevertheless, compared with the traditional one, the battery housing assembly 10 in this embodiment can also achieve the purpose of reducing the protrusion height of the pressure relief structure 200 because the connecting member 220 is accommodated in the mounting hole 1111 of the housing 100.

[0098] Furthermore, the thickness of the connecting member 220 is the same as the thickness of the first side wall 111.

[0099] First of all, by setting the thickness of the connecting member 220 to be the same as the thickness of the first side wall 111, it helps to optimize the overall welding quality and joint strength. When the thicknesses of the two are the same, the conduction and diffusion of heat during the welding process can be kept uniform, effectively reducing the deformation and stress concentration caused by thermal stress. This design not only improves the strength of the welding point but also ensures that there will be no problem of uneven distribution of mechanical stress caused by the thickness difference between the connecting member 220 and the first side wall 111 under the use conditions, which helps to extend the service life and safety of the product.

[0100] Secondly, the same thickness makes the fit between the connecting member 220 and the first side wall 111 better in the overall structure. Such a design eliminates the problems of poor contact and unstable connection caused by the thickness difference between the upper and lower components. When the battery housing assembly 10 undergoes thermal expansion or contraction during operation, the same thickness will contribute to achieving consistency in the thermal deformation of the material, further reducing the risk of local stress concentration caused by temperature difference changes. By optimizing the force distribution, the probability of component damage caused by external forces is reduced, and the durability and reliability of the entire battery housing assembly 10 are improved.

[0101] In one embodiment, the minimum area of the cross-section of the pressure relief hole 221 in the direction perpendicular to the thickness of the pressure relief structure 200 is not less than 0.18 m².

[0102] Specifically, the cross-sectional area of the pressure relief hole 221 directly affects the gas discharge rate and the timeliness of pressure release. When the minimum area of the pressure relief hole 221 reaches or exceeds 0.18 m², it can ensure that when abnormal conditions such as thermal runaway or overpressure occur in the battery, the internal gas can quickly discharge through the pressure relief hole, preventing the housing 100 from cracking or exploding due to excessive internal pressure. This design effectively improves the safety protection ability of the battery housing assembly 10 and reduces the risk of safety accidents.

[0103] It should be noted that the minimum area of the pressure relief hole 221 can also be adjusted according to actual application requirements. For example, it can be designed as 0.18 m², 0.20 m², 0.22 m², 0.25 m² or larger, which is specifically determined based on factors such as battery capacity, gas generation rate, and pressure relief requirements. When the area of the pressure relief hole 221 is less than 0.18 m², it may lead to restricted pressure relief channels, insufficient gas discharge speed, and inability to quickly release the internal pressure, increasing potential safety hazards.

[0104] Refer to Figure 6 In the embodiment shown in (a) of [], the pressure relief hole 221 is designed as a strip-shaped hole. The advantage of this shape is that it can effectively improve the gas discharge efficiency and is suitable for ultra-thin batteries with high volume requirements. In addition, the width of the strip-shaped hole can be optimized according to specific applications to ensure a better pressure relief effect without affecting the battery performance.

[0105] Refer to Figure 6 In the embodiment shown in (b) of [], the pressure relief hole 221 is designed as a circular hole with a diameter not less than 0.5 mm. This design ensures the pressure relief effect while reducing the requirements for processing accuracy during manufacturing. The uniform distribution of the circular holes helps the gas to quickly diffuse and avoids potential safety hazards caused by excessive local pressure.

[0106] In a preferred embodiment, the pressure relief cover 210 is coaxially arranged with the pressure relief hole 221.

[0107] In this embodiment, the pressure relief cover 210, as a key component of the battery housing assembly 10, is responsible for effectively discharging gas when the internal pressure is too high. The coaxial arrangement with the pressure relief hole 221 can optimize the gas flow channel during pressure relief, ensuring that the gas quickly and smoothly discharges from the internal space, thereby reducing the internal pressure and preventing potential safety hazards caused by excessive pressure. The coaxial design of the pressure relief cover 210 and the pressure relief hole 221 ensures the linearity of the gas flow path. When the pressure relief cover 210 is opened, the gas can quickly flow out along the pressure relief hole 221 that is coaxially aligned with it, reducing the resistance caused by the gas flow turning. This flow characteristic not only increases the pressure relief efficiency but also can quickly respond to changes in internal pressure, improving the safety of the entire battery housing assembly 10 in case of emergencies.

[0108] In one embodiment, the adhesive 230 is a thermosensitive adhesive.

[0109] By using a thermosensitive adhesive material with a preset melting point to make the adhesive 230, it can effectively melt during a thermal runaway of the battery, thereby quickly forming a pressure relief channel to ensure the timely release of gas and reducing the risk of internal pressure. Specifically, the adhesive 230 can be at least one of polyethylene, polyvinyl chloride, polystyrene, polyamide, polycarbonate, and polyphenylene ether.

[0110] In one embodiment, the housing 100 is a rectangular body and can be applied to rectangular batteries. Specifically, the housing 100 includes a middle frame 110, the middle frame 110 is provided with two openings, the housing wall includes two cover plates 120, and the two cover plates 120 and the middle frame 110 are fixedly connected to respectively close the two openings; the middle frame 110 and the cover plates 120 form a receiving cavity; the housing wall further includes a first housing wall 112; the middle frame 110 includes a first side wall 111 and a first housing wall 112 connected to the first side wall 111, the first side wall 111 and at least one cover plate 120 are integrally formed, and / or the first side wall 111 and at least one first housing wall 112 are integrally formed. Such a design reduces the number of connection points and the risk of damage caused by stress concentration.

[0111] In this embodiment, the rectangular design of the housing 100 provides excellent space utilization, can effectively accommodate a larger capacity of battery cells, and ensures the stability of the overall structure. The combination of the middle frame 110 and the cover plates 120 forms a good sealing performance, thereby protecting the internal battery components from the external environment and enhancing the reliability of the device. In the above embodiment, the middle frame 110 and the cover plates 120 are generally planar structures. Of course, in some embodiments, when the battery housing assembly 10 is applied to a cylindrical battery, the pressure relief structure 200 can also be provided on the end face of the cylindrical housing 100, which will not be elaborated here.

[0112] In one embodiment, the middle frame 110 can be a single-piece component. This design can effectively improve its structural strength and rigidity, and reduce the stress concentration phenomenon caused by the connection of multiple components. In addition, the integrated middle frame 110 simplifies the production process, reduces the difficulty in the assembly process, thereby improving the production efficiency and overall assembly quality. Since there are no additional connection points, the potential leakage risk caused by insufficient airtightness at the connection is avoided, which is crucial for the sealing performance of the battery housing.

[0113] In addition, the middle frame 110 and one of the cover plates 120 can also form a single-piece component. Such a design will also further enhance the stability and sealing effect of the housing. The integrated structure not only reduces the number of components, but also improves the overall durability and reliability, and at the same time can reduce the assembly time and cost.

[0114] It should be noted that by using the connecting piece 220 to carry the pressure relief cover 210, when assembling the battery housing assembly 10, the pressure relief cover 210 and the connecting piece 220 can be first connected to form a modular structure, and then this modular structure can be installed in the mounting hole 1111, and after the connecting piece 220 is connected to the housing 100, the battery housing assembly 10 is formed, and the assembly efficiency is improved.

[0115] In one embodiment, when processing the connecting piece 220, the middle frame 110 of the housing 100 can be directly cut to cut out the connecting piece 220, so that the processing efficiency is improved and the material cost is saved.

[0116] In one embodiment, the side of the cross-section of the pressure relief hole 221 in the direction perpendicular to the thickness direction of the pressure relief structure 200 is a curve, a broken line, or a combination of a curve and a broken line. This diverse structural design not only improves the hydrodynamic performance of the pressure relief hole 221, but also effectively improves the gas flow characteristics, thereby enhancing the use reliability and safety of the entire pressure relief structure 200.

[0117] Specifically, when the side of the pressure relief hole 221 is a smooth curve, the gas can flow quickly and smoothly through the hole, reducing severe pressure drops and turbulence phenomena. In fluid mechanics, the continuity of streamlines is a key factor affecting flow efficiency, and a smooth curve can effectively reduce flow resistance and increase the pressure relief speed. This design can ensure that under high-pressure conditions, the gas can be released from the accommodation cavity in a timely and effective manner, thereby reducing the internal pressure and avoiding structural damage caused by excessive pressure.

[0118] On the other hand, when the side is a fold line or a combination of a curve and a fold line, the shape of the hole can cleverly guide the flow of the fluid. This design can increase the complexity of the flow path, thereby increasing the contact time between the gas and the hole wall, thereby enhancing the heat exchange and release effect of the gas. At the same time, the fold line design also helps to guide the airflow in a specific direction and avoid the formation of airflow dead zones. If the flow speed is too fast during the pressure relief operation, it may cause airflow vortexes. Choosing a fold line shape can reduce this risk and make the fluid flow more regularly.

[0119] In specific implementations, the cross-sectional shape of the pressure relief hole 221 can be optimized according to actual application requirements. For example, if applied to high temperature or drastic pressure changes, the side design of the pressure relief hole 221 can be preferably curved, which can maintain good flow performance under different conditions; and in some devices that make efficient use of the pressure relief passage, a broken line structure may be more preferred, because this design can reasonably control the pressure relief flow rate and reduce the pressure fluctuation caused by nonlinear flow.

[0120] It should be pointed out that although a design of a curve, a broken line or a combination of the two is selected, the specific shape and structural parameters should be adjusted accordingly according to the specific application conditions of the pressure relief structure 200 and the required pressure relief performance to ensure that the best authority requirements and safety levels are achieved. For example, in high-voltage battery applications, suitable pressure relief hole shapes and sizes can be circular, elliptical or other polygonal shapes, and these designs should be strictly evaluated for their impact on pressure relief performance. The final design aims to meet the safety, reliability and economy of the system, ensuring that the pressure relief hole 221 exhibits excellent performance when dealing with internal overpressure.

[0121] See also Figure 2 As shown, in one embodiment, the housing 100 has a first side surface m1, and the opening of the mounting hole 1111 is located on the side surface m1 of the housing 100. In this way, the mounting hole 1111 can be formed by stamping on the middle frame 110, so that the connector 220 is separated from the middle frame 110, thereby effectively improving the processing efficiency.

[0122] This stamping method can not only reduce material waste, but also simplify the processing steps, enable large-scale production, and reduce production costs. In combination with this technical solution, the mounting hole 1111 formed by stamping can provide a stable and easy-to-connect interface, thereby facilitating subsequent assembly and maintenance operations. In addition, since the stamping process has high repeatability and consistency, this also ensures the processing accuracy of each housing 100, thereby improving the quality stability of the overall product.

[0123] In a specific embodiment, the middle frame 110 can be stamped from materials such as steel, aluminum alloy, or high-strength metal, and the specific selection depends on the strength requirements of the product and the use environment. For example, using aluminum alloy as the material can not only reduce the overall weight but also has good corrosion resistance, which helps to extend the service life of the device. At the same time, the edges of the installation holes 1111 after stamping are deburred to ensure safety.

[0124] Refer to Figure 4 As shown, in another embodiment, the installation holes 1111 are provided through the first side wall 111 of the housing 100 at least on three side walls of the housing 100 connected in sequence. Specifically, the housing 100 has adjacent first side surface m1, second side surface m2, and third side surface m3. In this case, the installation holes 1111 can be directly cut on the middle frame 110 along the direction from the second side surface m2 to the third side surface m3 to form the installation holes 1111, so that the installation holes 1111 penetrate the first side surface m1. This design scheme not only simplifies the processing flow but also improves the processing efficiency.

[0125] With this setting, the connecting member 220 can be directly welded to the upper cover plate 120 and the lower cover plate 120, eliminating the reserved distance of the middle frame 110 in the width direction of the connecting member 220. This method greatly reduces the size of the overall structure of the battery housing assembly 10 and improves the space utilization rate. In addition, due to the elimination of the unnecessary reserved distance, the rigidity and stability of the connection are enhanced, and the quality and strength of the welding are improved.

[0126] Refer to Figure 5 As shown in (c) in the figure, in one embodiment, the design of the installation holes 1111 includes a positioning groove portion 11111 and a through groove portion 11112 that are connected and communicate with each other, and the two are combined to form a stepped groove-shaped installation hole 1111. This design enables the connecting member 220 to be effectively limited through the positioning groove portion 11111 when assembling the pressure relief structure 200. This limiting function significantly improves the assembly convenience and assembly accuracy of the pressure relief structure 200, reduces the assembly problems caused by position errors, and thus improves the reliability of the overall device.

[0127] In specific implementation, the size and shape of the positioning groove portion 11111 can be customized according to the shape of the connecting member 220 to ensure the precise positioning of the connecting member 220. With this setting, the dependence on the skills of operators during the assembly process can be effectively reduced, and the assembly process can be simplified. At the same time, since the connecting member 220 can be firmly embedded in the positioning groove portion 11111, the risk of loosening and falling off that may occur during use is reduced, further improving the stability and safety of the product.

[0128] In addition, the through groove portion 11112 can increase the overall structural strength of the mounting hole 1111, and at the same time provide good support for subsequent welding or other connection methods, thereby improving the assembly efficiency and optimizing the overall production process.

[0129] In one embodiment, at least a part of the adhesive member 230 is circumferentially arranged around the pressure relief hole 221, and at least a part of the adhesive member 230 is clamped between the pressure relief cover 210 and the connecting member 220.

[0130] In this embodiment, through the circumferential arrangement, the sealing performance of the pressure relief structure 200 is effectively improved, making the combination between the pressure relief cover 210 and the connecting member 220 closer. As the heat accumulates during the charging and discharging process of the battery, the internal pressure may rise sharply. If the pressure relief hole 221 fails to release the internal pressure in a timely and effective manner, it may cause deformation or explosion of the battery housing assembly 10. The circumferential arrangement of the adhesive member 230 forms a complete closed state between the connecting member 220 and the pressure relief cover 210 by using the adhesive material. This not only avoids the leakage risk caused by small bubbles or unsealed gaps due to structural defects, but also improves the reliability of the pressure relief structure 200 in various environments (such as high temperature, high pressure, etc.). In addition, when the battery is in an extreme working state, the adhesive member 230 softens or melts when the temperature exceeds a preset value, and can quickly and effectively form a pressure relief channel to ensure that the pressure relief cover 210 can be opened smoothly, thereby releasing the internal pressure. The timely response of this process further improves the safety performance of the battery. At the same time, by arranging the adhesive member 230 between the pressure relief cover 210 and the connecting member 220, the pressure relief cover 210 can be fixed to the connecting member 220 through the adhesive member 230, and the adhesive member 230 can soften or melt when the temperature exceeds the preset temperature to generate a gas channel between the pressure relief cover 210 and the connecting member 220.

[0131] In addition, this circumferential design also helps to evenly distribute stress, reduce the potential risk brought by concentrated stress, reduce the possibility of adhesive failure caused by uneven material expansion due to temperature change, and enhance the stability of the overall system. Therefore, the circumferential arrangement of the adhesive member 230 not only improves the sealing performance, but also helps to ensure the good safety and reliability of the battery during long-term and high-frequency operation.

[0132] In one embodiment, the thickness of the adhesive member 230 sandwiched between the pressure relief cover 210 and the connecting member 220 ranges from [0.04 mm, 0.5 mm]. This thickness range is selected to optimize the bonding effect while preventing the failure of the adhesive layer caused by the thermal influence generated during welding. The design of the adhesive member 230 allows for the selection of an appropriate thickness according to specific requirements during the production process to meet the requirements of different battery cells in terms of structural strength and thermal stability. In addition, the adhesive member 230 may include one or more layers of structure, and this flexibility enables the design to be adjusted according to different application scenarios, thereby improving the adaptability and safety of the product.

[0133] Of course, when the adhesive member 230 adopts a multi-layer structure, different characteristic materials can be applied in different layers. For example, a polymer with good high-temperature resistance characteristics can be used in the outer layer, and a material with excellent adhesion performance can be used in the inner layer. The advantage of this composite structure is that it can combine the characteristics of each layer of material, enhance the performance of the entire adhesive member, and improve its reliability in high-temperature and high-pressure environments.

[0134] Through reasonable design, the adhesive member 230 can not only provide a strong bonding effect but also effectively isolate the heat conduction during the welding process, reducing the risk of material failure caused by thermal influence. It should be noted that the thickness of the adhesive member 230 can be 0.04 mm, 0.10 mm, 0.20 mm, 0.30 mm, 0.5 mm. Of course, as the thickness of the adhesive member 230 increases, the overall thickness of the pressure relief structure 200 will also increase. The specific thickness adopted for the adhesive member 230 can be determined according to the design requirements of the battery housing assembly 10 and will not be elaborated here.

[0135] Refer to Figure 5 in (a) and Figure 5 as shown in (b), at least a part of the adhesive member 230 is also received in the pressure relief hole 221.

[0136] With this setting, the sealing performance of the pressure relief hole 221 can be further improved. At the same time, due to the increased bonding range of the adhesive member 230, the connection strength between the pressure relief cover 210 and the connecting member 220 can be further improved, ensuring the stability and reliability of the pressure relief structure 200 during use. A part of the adhesive member 230 being received inside the pressure relief hole 221 helps to form a more uniform pressure distribution area, thereby reducing the phenomenon of local stress concentration and the risk of damage to the pressure relief hole 221 caused by high pressure or thermal expansion.

[0137] In terms of the specific implementation manner, the material of the bonding member 230 can be a polymer with good flexibility. This material can adapt to environmental changes during the processes of thermal expansion and contraction, and maintain close contact with the pressure relief hole 221. When the internal pressure of the system increases, the presence of the bonding member 230 can not only effectively support the shape of the pressure relief hole, but also increase its compressive strength to a certain extent.

[0138] It should be noted that generally, there will be a little glue overflow after the thermal pressing of the pressure relief cover 210 and the bonding member 230. The edge of the glue overflow is usually controlled within 0.15 mm, that is, the bonding member 230 may overflow the outer edge of the pressure relief cover 210.

[0139] Furthermore, the pressure relief cover 210 is disposed in a fitting manner with the connecting member 220. The bonding member 230 is at least partially received in the pressure relief hole 221 and is respectively connected to the pressure relief cover 210 and the connecting member 220. This structural design not only achieves a good contact sealing effect, but also can effectively reduce the thickness occupied by the pressure relief structure 200 in the housing 100.

[0140] In addition, during the process of connecting the pressure relief cover 210 and the connecting member 220, the bonding member 230 forms a high-strength bonding state. This bonding state can effectively resist external impacts and vibrations, ensure that the pressure relief cover can also work stably under high-temperature or high-pressure environments, thereby improving the overall safety performance of the battery. By reasonably designing the material and thickness of the bonding member, the pressure range that the pressure relief structure 200 can withstand can be further optimized, providing greater guarantee for the safety of the product.

[0141] Specifically, the bonding member 230 includes a connecting glue portion 231. The connecting glue portion 231 is wound around and connected to the inner wall of the pressure relief hole 221, and the connecting glue portion 231 is hermetically connected to the side of the pressure relief cover 210 close to the pressure relief hole 221.

[0142] Through this design, the bonding area of the bonding member 230 is effectively increased. This not only improves the bonding effect of the bonding member 230, but also enhances the sealing performance of the entire pressure relief structure 200. The surrounding structure of the connecting glue portion 231 prompts it to form full contact with the inner wall of the pressure relief hole 221, thereby preventing the leakage of internal gas or liquid. This design provides a larger bonding surface for the connecting glue portion 231, making the bonding strength significantly enhanced during use. When heat is generated during the charging and discharging process of the battery, resulting in an increase in internal pressure, the increased bonding area can effectively resist the pressure change and prevent the possibility of bonding failure, thereby ensuring the effectiveness of the pressure relief structure under extreme conditions.

[0143] Furthermore, refer to Figure 5As shown in Fig. (b), the bonding member 230 further includes a fixing glue portion 232. The fixing glue portion 232 is connected to the connecting glue portion 231, and the fixing glue portion 232 is connected to the side of the connecting member 220 away from the pressure relief cover 210. This design can further improve the connection strength of the bonding member 230 and further reduce the overall thickness of the pressure relief structure 200.

[0144] In this embodiment, the pressure relief cover 210 can be attached to the outer surface of the connecting member 220 and connected to the pressure relief cover 210 and the pressure relief hole 221 respectively through the connecting glue portion 231 to fix the pressure relief cover 210.

[0145] Furthermore, the design and material selection of the connecting member 220 play a key role in the present invention. The design of the connecting member 220 needs to meet the strength and corrosion resistance requirements in the pressure relief structure 200. Specifically, the connecting member 220 can select appropriate materials according to actual applications, such as aluminum alloy, stainless steel or titanium alloy, etc. The selection of these materials can effectively improve the reliability and durability of the connecting member 220 under different environmental conditions. In specific implementations, aluminum alloy is suitable for occasions with lighter loads due to its light weight and good corrosion resistance; while stainless steel has higher strength and high temperature resistance characteristics and is very suitable for use in high temperature or high pressure environments.

[0146] In addition, when selecting materials, the specific conditions of the working site should also be considered, such as temperature changes, pressure fluctuations, and chemical characteristics of the contacting medium, etc., for targeted optimization selection to ensure that the connecting member 220 can work efficiently and stably under various working conditions. Through such material selection and optimization, the performance of the connecting member 220 can be maximally improved, enabling it to better adapt to different application requirements, and thus enhancing the reliability and service life of the overall device.

[0147] The present invention also provides a battery, which includes the battery housing assembly 10 and the battery cell in any of the foregoing embodiments. The battery cell is accommodated inside the battery housing assembly 10.

[0148] In this embodiment, the battery housing assembly 10 is cooperated with the connecting member 220 by providing mounting holes 1111 on the housing 100, thus achieving excellent assembly effects. When the connecting member 220 is accommodated in the mounting holes 1111 during the assembly process, compared with the pressure relief mechanism in traditional batteries, the design of the present invention can effectively reduce the protrusion height of the pressure relief structure 200 on the outer surface of the housing 100. This design optimization makes the overall structure of the battery housing assembly 10 more compact, not only improving the aesthetics of the battery, but also reducing the volume in the case of limited space, thereby providing greater flexibility for the design and functionality of electronic devices.

[0149] The battery provided by the embodiments of the present application can be widely applied to electronic devices such as mobile phones, wearable electronic products, tablet computers, laptop computers, etc. These devices have relatively high requirements for the thinness, lightness, and safety of the battery. By combining the above battery housing assembly 10 with the battery cell, while meeting the performance requirements of the electronic device, it also ensures good heat dissipation and excellent compressive performance of the battery. In addition, this design also provides convenience for the production and assembly of the battery, further improving the manufacturing efficiency and quality control.

[0150] In this embodiment, the housing is made of a metal material, specifically selected from materials such as stainless steel, titanium alloy, nickel alloy, chromium alloy, or aluminum alloy. These metal materials have excellent mechanical strength and corrosion resistance, and can effectively protect the internal components of the battery. The material of the connecting member 220 is the same as that of the housing 100, both being metal materials, which can ensure good welding effect. In a preferred case, both the connecting member 220 and the housing 100 are made of titanium alloy material, which not only helps to reduce the weight of the overall structure, but also provides higher strength. Using titanium alloy material has a low risk of deformation during welding processing, thereby enhancing its safety and service life.

[0151] The present invention also provides an electrical equipment, which includes an electrical device and the battery in any one of the above embodiments; the electrical device is electrically connected to the battery.

[0152] Of course, the electrical equipment can also be a battery assembly. In this case, the electrical equipment may include multiple batteries proposed in the present application, as well as a circuit structure, and the battery is electrically connected to the circuit structure. The aforementioned electrical device can also be a circuit structure.

[0153] It can be understood that in the electrical equipment of this embodiment, by providing a battery with the battery housing assembly 10 in any one of the above embodiments, the battery housing assembly 10 of this embodiment cooperates with the connecting member 220 by providing mounting holes 1111 on the housing 100. The connecting member 220 can be accommodated in the mounting holes 1111 during assembly. Compared with the pressure relief mechanism in a traditional battery, the protrusion height of the pressure relief structure 200 on the outer surface of the housing 100 can be reduced, making the overall structure of the battery housing assembly 10 more compact, reducing the occupied space in the electrical equipment, and ensuring the use safety of the electrical equipment.

[0154] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0155] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0156] In the embodiments of the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0157] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements 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 application.

Claims

1. A battery housing assembly (10), characterized in that: include: A shell (100) is provided with a receiving cavity, the shell (100) comprising a plurality of shell walls and a first side wall (111), at least a portion of the shell walls connected to the first side wall (111) being integrally formed with the first side wall (111), and the first side wall (111) being provided with a mounting hole (1111) communicating with the receiving cavity; as well as A pressure relief structure (200), comprising a pressure relief cover (210) and an adhesive member (230), wherein the adhesive member (230) is respectively connected to the pressure relief cover (210) and the first side wall (111), so that a sealing cover of the pressure relief cover (210) is disposed on the mounting hole (1111); The adhesive (230) is configured to soften, melt or gasify when the temperature exceeds a preset temperature so as to generate a gas channel between the pressure relief cover (210) and the first side wall (111).

2. The battery housing assembly (10) according to claim 1, characterized in that: The pressure relief structure (200) further comprises a connecting piece (220), wherein the connecting piece (220) is provided with a pressure relief hole (221) penetrating the connecting piece (220) in a thickness direction thereof; The adhesive member (230) is respectively connected to the pressure relief cover (210) and the connecting member (220), so that the sealing cover of the pressure relief cover (210) is arranged on the pressure relief hole (221); The connecting piece (220) and the first side wall (111) are fixedly connected so that the pressure relief structure (200) seals the mounting hole (1111).

3. The battery housing assembly (10) according to claim 2, characterized in that: In the thickness direction of the pressure relief structure (200), the orthographic projection of the pressure relief hole (221) is located within the orthographic projection of the mounting hole (1111), and / or the orthographic projection of the pressure relief hole (221) is within the orthographic projection of the adhesive (230).

4. The battery housing assembly (10) according to claim 2, characterized in that: In the thickness direction of the pressure relief structure (200), the outer peripheral edge of the orthographic projection of the adhesive component (230) is located within the orthographic projection of the connecting component (220).

5. The battery housing assembly (10) according to claim 4, characterized in that: In the direction from the center of the hole diameter of the pressure relief hole (221) to its circumferential edge, the minimum distance between the circumferential edge of the pressure relief hole (221) and the outer circumferential edge of the adhesive (230) is greater than or equal to 1.2 mm.

6. The battery housing assembly (10) according to claim 2, characterized in that: In the direction from the center of the hole diameter of the pressure relief hole (221) to its circumferential edge, the minimum distance between the circumferential edge of the pressure relief hole (221) and the circumferential edge of the pressure relief cover (210) is greater than or equal to 1.2 mm.

7. The battery housing assembly (10) according to claim 2, characterized in that: The connection between the connecting piece (220) and the first side wall (111) is achieved by welding, forming a weld (222).

8. The battery housing assembly (10) according to claim 7, characterized in that: The depth of the weld (222) is a, the thickness of the first side wall (111) is b, and the following relationship is satisfied: 0.7≤a / b≤1, where a and b are expressed in the same unit; And / or, the weld width of the weld (222) has a value range of [80µm, 165µm].

9. The battery housing assembly (10) according to claim 7, characterized in that: The adhesive (230) and the weld (222) are arranged at intervals, and along the direction from the aperture center of the pressure relief hole (221) to its circumferential edge, the minimum distance between the outer circumferential edge of the adhesive (230) and the weld (222) is not less than 0.2 mm.

10. The battery housing assembly (10) according to claim 2, characterized in that: The connecting piece (220) is made of the same material as the first side wall (111).

11. The battery housing assembly (10) according to claim 2, characterized in that: In the thickness direction of the pressure relief structure (200), the connecting piece (220) comprises two surfaces facing each other along the thickness direction of the pressure relief structure (200), and the first side wall (111) comprises two surfaces facing each other along the thickness direction of the pressure relief structure (200); A surface of the connecting member (220) close to the pressure relief cover (210) is coplanar with a surface of the first side wall (111) close to the pressure relief cover (210).

12. The battery housing assembly (10) according to claim 11, characterized in that: The thickness of the connecting member (220) is the same as the thickness of the first side wall (111).

13. The battery housing assembly (10) according to claim 2, characterized in that: The minimum cross-sectional area of ​​the pressure relief hole (221) in a direction perpendicular to the thickness of the pressure relief structure (200) is not less than 0.18 m2.

14. The battery housing assembly (10) according to claim 13, characterized in that: The pressure relief hole (221) is a strip-shaped hole; Alternatively, the pressure relief hole (221) is a circular hole, and the diameter of the pressure relief hole (221) is not less than 0.5 mm.

15. The battery housing assembly (10) according to claim 2, characterized in that: The pressure relief cover (210) and the pressure relief hole (221) are coaxially arranged.

16. The battery housing assembly (10) according to claim 1, characterized in that: The adhesive component (230) is a heat-sensitive adhesive.

17. The battery housing assembly (10) according to claim 16, characterized in that: The adhesive (230) is at least one of polyethylene, polyvinyl chloride, polystyrene, polyamide, polycarbonate, and polyphenylene ether.

18. The battery housing assembly (10) according to claim 1, characterized in that: The housing (100) comprises a middle frame (110), and the middle frame (110) is provided with two openings; The shell wall comprises two cover plates (120), and the two cover plates (120) and the middle frame (110) are fixedly connected to close the two openings respectively; the middle frame (110) and the cover plates (120) form the accommodating cavity; The shell wall also includes a first shell wall (112); The middle frame (110) comprises the first side wall (111) and the first shell wall (112) connected to the first side wall (111); the first side wall (111) and at least one of the cover plates (120) are integrally formed, and / or the first side wall (111) and at least one of the first shell walls (112) are integrally formed.

19. The battery housing assembly (10) according to claim 18, characterized in that: The middle frame (110) is an integral part, or the middle frame (110) and one of the cover plates (120) are an integral part.

20. The battery housing assembly (10) according to any one of claims 1 to 19, characterized in that: At least a portion of the adhesive component (230) is circumferentially arranged around the pressure relief hole (221), and at least a portion of the adhesive component (230) is sandwiched between the pressure relief cover (210) and the connecting component (220).

21. The battery housing assembly (10) according to claim 20, characterized in that: The thickness of the adhesive member (230) sandwiched between the pressure relief cover (210) and the connecting member (220) is in the range of [0.04 mm, 0.5 mm].

22. The battery housing assembly (10) according to claim 20, characterized in that: At least a portion of the adhesive component (230) is also accommodated in the pressure relief hole (221).

23. The battery housing assembly (10) according to any one of claims 1 to 19, characterized in that: The pressure relief cover (210) and the connecting piece (220) are arranged in close contact with each other, and the adhesive piece (230) is at least partially accommodated in the pressure relief hole (221) and is respectively connected to the pressure relief cover (210) and the connecting piece (220).

24. The battery housing assembly (10) according to claim 23, characterized in that: The adhesive component (230) comprises a connecting adhesive portion (231), the connecting adhesive portion (231) being arranged around and connected to the inner wall of the pressure relief hole (221), and the connecting adhesive portion (231) is sealingly connected to a side of the pressure relief cover (210) close to the pressure relief hole (221).

25. The battery housing assembly (10) according to claim 24, characterized in that: The adhesive component (230) further comprises a fixed adhesive portion (232), the fixed adhesive portion (232) being connected to the connecting adhesive portion (231), and the fixed adhesive portion (232) being connected to a side of the connecting component (220) away from the pressure relief cover (210).

26. The battery housing assembly (10) according to claim 25, characterized in that: The fixed rubber portion (232) is circumferentially arranged around the pressure relief hole (221).

27. A battery, characterized in that: include: The battery housing assembly (10) according to any one of claims 1 to 26; and The battery cell is accommodated in the battery housing assembly (10).

28. An electrical equipment, characterized in that: Comprising a battery as claimed in claim 27.

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