Battery case assembly, battery, and electric device

Abstract

The application relates to the technical field of batteries, and relates to a battery shell assembly, a battery and an electric device. 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 walls connected with the first side wall is integrally formed with the first side wall, the first side wall is provided with a mounting hole communicated with a containing cavity; the pressure relief structure comprises a pressure relief cover and an adhesive piece, the adhesive piece is connected with the pressure relief cover and the first side wall respectively, so that the pressure relief cover is arranged on the mounting hole; the adhesive piece is configured to soften or melt or gasify when the temperature exceeds a preset temperature, so that a gas passage is formed between the pressure relief cover and the first side wall. In the battery shell assembly of the embodiment, the adhesive piece is arranged to connect the pressure relief cover and the first side wall, when pressure relief is needed, the adhesive piece can form a gas passage with the first side wall to perform pressure relief. Compared with the pressure relief structure in a traditional battery, the battery shell assembly has high reliability, has few components of the pressure relief structure, and is beneficial to assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery shell assembly, a battery and an electric device. BACKGROUND

[0002] With the rapid development of renewable energy and electric vehicles, the safety performance of batteries has become a key technical issue of the industry. During the charging and discharging process of the battery cell, a certain amount of 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 shell to explode or other safety hazards. Therefore, in order to prevent such situations from occurring, the battery shell is usually equipped with a pressure relief mechanism to effectively release the internal pressure and ensure the safe operation of the equipment.

[0003] The battery in the prior art usually sets the pressure relief structure on the cover plate, and welds the cover plate and the shell to close the core. The pressure relief structure is fixedly connected with the battery cover plate, and when the pressure relief structure is impacted, the fixed connection of the cover plate and the shell will be affected, and the connection strength of the cover plate and the shell will be affected.

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

[0005] The present application provides a battery shell assembly, a battery and an electric device, which solves the problem that the pressure relief structure in the prior art is impacted, which affects the fixed connection of the cover plate and the shell, and the connection strength of the cover plate and the shell is affected.

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

[0007] a shell provided with a receiving cavity, the shell comprising a plurality of shell walls and a first side wall, at least part of the shell walls connected to the first side wall being integrally formed with the first side wall, the first side wall being provided with a mounting hole communicating with the receiving cavity; and

[0008] a pressure relief structure comprising a pressure relief cover and an adhesive member, the adhesive member being connected with the pressure relief cover and the first side wall respectively, so that the pressure relief cover is sealingly arranged in the mounting hole;

[0009] the adhesive member is configured to soften or melt or gasify when the temperature exceeds a preset temperature to form a gas passage between the pressure relief cover and the first side wall;

[0010] The pressure relief structure further comprises a connecting member provided with a pressure relief hole penetrating through the connecting member in the thickness direction of the connecting member, and the adhesive member is connected with the pressure relief cover and the connecting member respectively, so that the pressure relief cover is sealingly arranged in the pressure relief hole;

[0011] In the thickness direction of the pressure relief structure, the outer circumferential edge of the normal projection of the bonding piece is located inside the normal projection of the connecting piece, in the direction from the hole center of the pressure relief hole to the circumferential edge thereof, the minimum distance between the circumferential edge of the pressure relief hole and the outer circumferential edge of the bonding piece is greater than or equal to 1.2 mm, and 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;

[0012] The connecting piece is accommodated in the mounting hole of the shell, and in the thickness direction of the pressure relief structure, the connecting piece includes two surfaces opposite in the thickness direction of the pressure relief structure, and the first side wall includes two surfaces opposite in the thickness direction of the pressure relief structure.

[0013] The surface of the connecting piece close to the pressure relief cover is coplanar with the surface of the first side wall close to the pressure relief cover.

[0014] The thickness of the connecting piece is the same as the thickness of the first side wall.

[0015] In a possible implementation, the connecting piece and the first side wall are fixedly connected to seal the mounting hole with the pressure relief structure.

[0016] In a possible implementation, in the thickness direction of the pressure relief structure, the normal projection of the pressure relief hole is located inside the normal projection of the mounting hole, and / or the normal projection of the pressure relief hole is located inside the normal projection of the bonding piece.

[0017] In a possible implementation, the connecting piece and the first side wall are connected by welding, and a weld is formed.

[0018] In a possible implementation, the depth of the weld is a, 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 width of the weld is in the range of [80 µm, 165 µm].

[0021] In a possible implementation, the bonding piece and the weld are spaced apart, and in the direction from the hole center of the pressure relief hole to the circumferential edge thereof, the minimum distance between the outer circumferential edge of the bonding piece and the weld is not less than 0.2 mm.

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

[0023] In a possible implementation, the minimum area of the cross section of the pressure relief hole perpendicular to the thickness direction of the pressure relief structure is not less than 0.18 m².

[0024] In a possible implementation, the pressure relief hole is a strip-shaped hole.

[0025] Alternatively, the pressure relief hole is a circular hole, and a diameter of the pressure relief hole is not less than 0.5 mm.

[0026] In a possible implementation, the pressure relief cover is coaxially arranged with the pressure relief hole.

[0027] In a possible implementation, the adhesive is a heat-sensitive glue.

[0028] In a possible implementation, the adhesive is at least one of polyethylene, polyvinyl chloride, polystyrene, polyamide, polycarbonate, and polyphenyl ether.

[0029] In a possible implementation,

[0030] The shell includes a middle frame, and the middle frame is provided with two openings.

[0031] The shell wall includes two cover plates, and the two cover plates and the middle frame are fixedly connected to respectively close the two openings; the middle frame and the cover plates form the accommodation cavity.

[0032] The shell wall further includes a first shell wall.

[0033] The middle frame includes the first side wall and the first shell wall connected to the first side wall, and 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 shell walls are integrally formed.

[0034] In a possible implementation, the middle frame is an integral piece, or the middle frame and one of the cover plates are an integral piece.

[0035] In a possible implementation, at least part of the adhesive is circumferentially arranged around the pressure relief hole, and the adhesive is at least partially clamped between the pressure relief cover and the connecting piece.

[0036] In a possible implementation, a thickness of the adhesive clamped between the pressure relief cover and the connecting piece ranges from 0.04 mm to 0.5 mm.

[0037] In a possible implementation, at least part of the adhesive is further accommodated in the pressure relief hole.

[0038] In a possible implementation, the pressure relief cover is arranged in abutment with the connecting piece, the adhesive is at least partially accommodated in the pressure relief hole and respectively connected to the pressure relief cover and the connecting piece.

[0039] In a possible implementation, the adhesive member comprises a connecting adhesive part, the connecting adhesive part is connected to the inner wall of the pressure relief hole, and the connecting adhesive part is sealingly connected to the pressure relief cover on the side close to the pressure relief hole.

[0040] In a possible implementation, the adhesive member further comprises a fixing adhesive part, the fixing adhesive part is connected to the connecting adhesive part, and the fixing adhesive part and the connecting member are connected on the side away from the pressure relief cover.

[0041] In a possible implementation, the fixing adhesive part is arranged in a circumferential direction of the pressure relief hole.

[0042] The second aspect of the present application provides a battery, comprising:

[0043] The battery shell assembly according to any one of the preceding battery shell assemblies; and

[0044] The battery shell assembly according to any one of the preceding battery shell assemblies; and

[0045] The third aspect of the present application provides a use electric device, comprising the battery according to any one of the preceding batteries.

[0046] The implementation of the present application has the following beneficial effects:

[0047] In the battery shell assembly of the present embodiment, the adhesive member is arranged to connect the pressure relief cover and the first side wall, and when pressure relief is needed, the adhesive member can form a gas passage with the first side wall to perform pressure relief. Compared with the pressure relief structure in the conventional battery, the pressure relief structure of the present application has fewer components and is beneficial to assembly, and the assembly efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application. Those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0049] Figure 1 A perspective view of the battery shell assembly in the embodiment of the present application is shown;

[0050] Figure 2 An assembly schematic view of the battery shell assembly in the embodiment of the present application is shown;

[0051] Figure 3 A cross-sectional view of the battery shell assembly in the embodiment of the present application is shown;

[0052] Figure 4Assembled schematic diagram of the battery shell assembly in another embodiment of the present application is shown;

[0053] Figure 5 Cross-sectional view of the battery shell assembly in some embodiments of the present application is shown;

[0054] Figure 6 Structural schematic diagram of the connecting piece in some embodiments of the present application is shown;

[0055] Reference signs:

[0056] 10-battery shell assembly;

[0057] 100-shell; 110-middle frame; 111-first sidewall; 1111-mounting hole; 11111-positioning groove part; 11112-through groove part; 112-first shell wall; 120-cover plate;

[0058] 200-pressure relief structure; 210-pressure relief cover; 220-connecting piece; 221-pressure relief hole; 222-welding seam; 230-adhesive; 231-connecting adhesive part; 232-fixing adhesive part. DETAILED DESCRIPTION

[0059] 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 described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0060] With the rapid development of renewable energy and electric vehicles, the safety performance of batteries has become a key technical issue of the industry. During the charging and discharging process of the battery cell, a certain amount of 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 shell to explode or other safety hazards. Therefore, in order to prevent such situations from occurring, the battery shell is usually equipped with a pressure relief mechanism to effectively release the internal pressure and ensure the safe operation of the equipment.

[0061] The battery in the prior art usually sets the pressure relief structure on the cover plate, and welds the cover plate and the shell to close the core. The pressure relief structure is fixedly connected with the battery cover plate, and when the pressure relief structure is impacted, the fixed connection of the cover plate and the shell will be affected, and the connection strength of the cover plate and the shell will be affected.

[0062] In view of the above problems, reference is made to Figures 1 to 6As shown, the battery shell assembly 10 provided by the embodiment of the present application has a more simplified structure and higher space utilization efficiency. Specifically, the battery shell assembly 10 comprises a shell 100 and a pressure relief structure 200. The shell 100 is provided with a receiving cavity. The shell 100 comprises a plurality of shell walls and a first side wall 111. At least part of the shell walls connected to the first side wall 111 are integrally formed with the first side wall 111. The first side wall 111 is provided with a mounting hole 1111 which is communicated with the receiving cavity. The pressure relief structure 200 comprises a pressure relief cover 210 and an adhesive member 230. The adhesive member 230 is connected with the pressure relief cover 210 and the first side wall 111 respectively, so that the pressure relief cover 210 is sealingly arranged in the mounting hole 1111. The adhesive member 230 is configured to soften, melt or gasify when the temperature exceeds a preset temperature, so as to form a gas passage between the pressure relief cover 210 and the first side wall 111.

[0063] In the battery shell assembly 10 of the embodiment, the adhesive member 230 is arranged to connect the pressure relief cover 210 and the first side wall 111. When pressure relief is needed, the adhesive member 230 can form a gas passage between the pressure relief cover 210 and the first side wall 111 to release pressure. Compared with the conventional pressure relief structure 200 in a battery, the pressure relief structure 200 of the present application has fewer components and is easier to assemble, which can improve the assembly efficiency.

[0064] Meanwhile, by adopting the integrally formed structure of the shell walls and the first side wall 111, the production process is simplified, and the structural strength of the shell 100 is effectively improved. The integrally formed structure eliminates the additional connection points between the plurality of shell walls of the first side wall 111, avoiding potential damage caused by stress concentration at the connection points. The improvement not only ensures that the overall structure of the shell 100 is more stable, but also enhances the impact resistance to a certain extent and reduces the risk of damage to the shell 100 in extreme use environments.

[0065] Specifically, the adhesive member 230 maintains the sealing connection between the pressure relief cover 210 and the first side wall 111 under normal circumstances, ensuring the sealing and structural integrity of the battery. When an abnormally high temperature or overpressure occurs, the adhesive member 230 softens, melts or gasifies to form a gas passage and complete pressure relief.

[0066] The advantage of this design is that the adhesive member 230 acts as a buffer layer to absorb and disperse external impact forces, avoiding the direct transmission of impact forces to the shell 100, especially the first side wall 111 and the surrounding structure. Compared with the welding or rigid fixation of the pressure relief device and the cover plate in the conventional pressure relief structure, the impact force is often directly applied to the connection between the cover plate and the shell, which may cause fatigue, rupture or a decrease in connection strength at the welding points.

[0067] By the adhesive 230, the impact force is effectively "vented", not only protecting the structural integrity of the shell 100, but also avoiding the attenuation of the connection strength between the cover plate and the shell, improving the overall safety and reliability of the battery. In addition, the softening and rupture of the adhesive 230 only occurs when the preset temperature is exceeded, ensuring structural stability during normal use, and only playing a role in emergency pressure relief, balancing safety and performance. Further, the pressure relief structure 200 further comprises a connecting piece 220, the connecting piece 220 is provided with a pressure relief hole 221 penetrating the connecting piece 220 in the thickness direction of the connecting piece 220; the adhesive 230 is connected with the pressure relief cover 210 and the connecting piece 220 respectively, so that the pressure relief cover 210 is sealed and covered on the pressure relief hole 221; the connecting piece 220 and the first side wall 111 are fixedly connected to enable the pressure relief structure 200 to be sealingly installed in the mounting hole 1111, so that the pressure relief structure 200 can be firmly installed in the mounting hole 1111 of the battery shell.

[0068] By this arrangement, not only the installation stability of the pressure relief structure 200 is ensured, but also the overall safety of the battery shell assembly 10 is enhanced. By firmly fixing the connecting piece 220 on the first side wall 111, displacement of the pressure relief structure 200 due to vibration or impact is avoided, ensuring the reliability of the pressure relief function.

[0069] In an embodiment, in the thickness direction of the pressure relief structure 200, the normal projection of the pressure relief hole 221 is located within the normal projection of the mounting hole 1111.

[0070] This design ensures that after covering the pressure relief hole 221, the pressure relief cover 210 can fully seal the pressure relief hole 221, thereby effectively preventing internal pressure from leaking through the pressure relief hole 221, further enhancing the sealing and reliability of the entire pressure relief structure 200.

[0071] By reasonably configuring the normal projection relationship between the pressure relief hole 221 and the mounting hole 1111, an optimized stress distribution area is constructed. This configuration can effectively avoid the pressure applied by the internal cavity to the pressure relief structure 200 from adversely affecting the connection strength around the mounting hole 1111. Specifically, under the action of pressure, the adhesive strength between the connecting piece 220 and the shell 100 will not be weakened due to the concentration of pressure, thereby ensuring the stability of the entire pressure relief structure 200.

[0072] Specifically, referring to Figure 3 As shown in the figure, in the thickness direction of the pressure relief structure 200, the outer circumferential edge of the normal projection of the adhesive 230 is located within the normal projection of the connecting piece 220.

[0073] Therefore, the adhesion reliability between the pressure relief cover 210 and the connecting piece 220 can be ensured. Since the coverage of the adhesive piece 230 is not less than the pressure relief cover 210, it is easier to ensure that the pressure relief cover 210 is in full contact with the adhesive piece 230 during assembly, so that the connection between the pressure relief cover 210 and the adhesive piece 230 is more secure. In addition, the orthographic projection of the pressure relief cover 210 on the adhesive piece 230 is located on the inner side of the adhesive piece 230, or the edge of the pressure relief cover 210 is flush with the edge of the adhesive piece 230.

[0074] Referring to Figure 3 As shown, the minimum distance between the circumferential edge of the pressure relief hole 221 and the outer circumferential edge of the adhesive piece 230 in the direction from the hole center of the pressure relief hole 221 to the circumferential edge thereof is greater than or equal to 1.2 mm. The minimum distance between the circumferential edge of the pressure relief hole 221 and the circumferential edge of the pressure relief cover 210 in the direction from the hole center of the pressure relief hole 221 to the circumferential edge thereof is greater than or equal to 1.2 mm.

[0075] 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 adhesive piece 230 and the circumferential edge of the pressure relief hole 221 is d2.

[0076] In this embodiment, by controlling the sizes of d1 and d2, the connection strength between the pressure relief cover 210 and the adhesive piece 230 and the sealing effect of the adhesive piece 230 can be ensured, and the 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 safety hazards caused by excessive gas pressure.

[0077] Specifically, the layout of the pressure relief cover 210 and the adhesive piece 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 adhesive piece 230 and the pressure relief hole 221 can protect the adhesive piece from melting at high temperatures to effectively form a pressure relief passage, thereby improving the pressure relief efficiency. Of course, the settings of d1 and d2 are determined according to the sizes of the pressure relief hole 221 and the connecting piece 220, which will not be described here.

[0078] In an embodiment, the connecting piece 220 and the shell 100 are fixed by welding.

[0079] With the above arrangement, the 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 that the connecting piece 220 and the shell 100 form a tight contact, so that the battery shell assembly 10 has better carrying capacity during operation. At the same time, since welding can achieve high connection precision, it can effectively reduce stress concentration and improve the fatigue life of the device under dynamic load conditions.

[0080] In order to enhance the welding effect of the connecting piece 220, the selection of the material is also crucial. In the embodiment, the connecting piece 220 and the shell 100 can be selected from metal materials with good welding performance, such as aluminum alloy, stainless steel or titanium alloy. These materials not only can 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 piece 220 and the shell 100 can be further optimized, thereby improving the thermal management effect of the whole assembly.

[0081] Specifically, the connecting piece 220 is connected to the first side wall 111 by welding, and a weld 222 is formed. 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, wherein a and b are measured in the same unit; and / or the value of the fusion width of the weld 222 is in the range of [80µm, 165µm]. With the above arrangement, the firmness and strength of the connection between the connecting piece 220 and the shell 100 can be optimized.

[0082] Specifically, the fusion depth of the weld 222 is controlled to be between 70% and 100% of the thickness of the side wall, which can effectively provide sufficient connection strength while avoiding thermal defects. During welding, the fusion width is set to 80-165 microns. Such parameter setting not only improves the mechanical properties of the weld, but also reduces the degradation of material properties due to heat effect. Therefore, the high-strength connection formed by the weld 222 ensures good contact between the connecting piece 220 and the shell 100, thereby improving the durability and safety of the overall structure.

[0083] To further optimize the connection performance, a specific welding process can be considered during welding, such as laser welding or TIG welding, which can better control the heat input of the weld, thereby reducing defects and deformation that may occur during welding. In addition, post-processing techniques for the weld 222, such as heat treatment or surface spraying, can also effectively improve its corrosion resistance and fatigue resistance, thereby prolonging the overall service life of the product. The design of these specific embodiments improves the reliability and safety of the weld, ensuring its excellent performance in various practical application scenarios while meeting the technical features.

[0084] In this embodiment, the connecting piece 220 and the shell 100 are connected by welding to form a weld 222 to ensure the strength and stability of the connection. To further improve the overall performance of the pressure relief structure 200, an adhesive piece 230 is arranged between the pressure relief cover 210 and the connecting piece 220, respectively connected with the two components. The edge of the adhesive piece 230 is kept a certain distance from the weld 222, which is set to avoid melting of the adhesive piece 230 due to high temperature during welding, thereby ensuring its adhesive performance and structural integrity.

[0085] With this design scheme, the adhesive piece 230 not only effectively enhances the adhesive strength between the connecting piece 220 and the pressure relief cover 210, but also reduces the risk of damage to the heat-affected zone during welding. This edge spacing structure optimizes the thermal management of the weld 222, ensuring better welding quality, thereby maintaining the overall sealing and reliability while ensuring mechanical strength.

[0086] Referring to Figure 3 As shown, the adhesive piece 230 and the weld 222 are spaced apart, and along the direction from the center of the hole diameter of the pressure relief hole 221 to its peripheral edge, the minimum distance between the outer peripheral edge of the adhesive piece 230 and the weld 222 is not less than 0.2mm. With this setting, it can be ensured that the high temperature generated during welding will not have a negative impact on the adhesive piece 230, thereby effectively maintaining its adhesive performance and structural integrity. Specifically, this spacing reduces the heat-affected zone of the adhesive material under high temperature, ensuring that the adhesive maintains its physical and chemical properties during welding, avoiding the risk of melting or performance degradation due to temperature rise.

[0087] By setting the minimum distance between the adhesive piece 230 and the weld 222, the structure can exhibit higher reliability and durability during welding 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 risk of failure.

[0088] In an embodiment, the connecting piece 220 and the shell 100 are made of the same material, which effectively improves the welding strength, thereby enhancing the overall stability and durability of the entire battery shell assembly 10. The consistent material properties not only ensure the consistency of heat conduction during welding, but also reduce the stress concentration phenomenon that may occur during welding.

[0089] Specifically, when the connecting piece 220 is made of the same material as the shell 100, 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 due to different materials. This reduces the risk of failure of the joint area caused by thermal stress to some extent, ensuring the sealing and structural integrity of the battery shell under various working conditions. At the same time, whenever the battery undergoes charging and discharging or long-term work, the thermal deformation of the material may cause small cracks at the joint, and the same material can effectively adapt to similar thermal expansion, thereby reducing the probability of crack occurrence.

[0090] In addition, the consistency of the material also brings many other advantages to the subsequent production and processing process. For example, in the surface treatment and coating application processes, components of the same material can avoid adhesion problems or corrosion reactions caused by different material chemical properties. This not only improves the appearance and service life of the battery shell assembly 10, but also reduces the complexity and cost of the production process.

[0091] Specifically, the material selection of the connecting piece 220 and the shell 100 should be determined according to specific design requirements. Common materials can be aluminum alloy, stainless steel, or engineering plastic, etc. In the process of material selection, the use environment, working temperature, and expected service life of the battery can be considered comprehensively to determine the best material combination to ensure that the performance requirements are met under various conditions.

[0092] Specifically, in the thickness direction of the pressure relief structure 200, the connecting piece 220 includes two surfaces opposite in the thickness direction of the pressure relief structure 200, and the first side wall 111 includes two surfaces opposite in the thickness direction of the pressure relief structure 200; the surface of the connecting piece 220 close to the pressure relief cover 210 is coplanar with the surface of the first side wall 111 close to the pressure relief cover 210.

[0093] By setting the connecting piece 220 flush with the outer surface of the shell 100, compared with the traditional battery shell structure, the battery shell assembly 10 in the embodiment has a lower protrusion height on the side surface provided with the pressure relief structure 200, so that the overall structure of the battery shell assembly 10 is more compact. Of course, in some embodiments, the thickness of the connecting piece 220 can also be less than the thickness of the first side wall 111 of the shell 100, at which time the outer surface of the connecting piece 220 will be located inside the outer surface of the shell 100, further improving the compactness of the battery shell assembly 10.

[0094] Of course, in some embodiments, the connecting piece 220 can also protrude from the outer surface of the shell 100. However, compared with the traditional, since the connecting piece 220 is accommodated in the mounting hole 1111 of the shell 100, the battery shell assembly 10 in the embodiment can also achieve the purpose of reducing the protrusion height of the pressure relief structure 200.

[0095] Further, the thickness of the connecting piece 220 is the same as the thickness of the first side wall 111.

[0096] First, by setting the thickness of the connecting piece 220 to be the same as the thickness of the first side wall 111, the overall welding quality and joint strength are optimized. When the thicknesses are consistent, the heat conduction and diffusion during welding can be uniform, effectively reducing deformation and stress concentration caused by thermal stress. This design not only improves the strength of the welding point, but also ensures that there is no uneven distribution of mechanical stress between the connecting piece 220 and the first side wall 111 due to thickness differences under use conditions, which helps to extend the service life and safety of the product.

[0097] Second, the same thickness makes the connecting piece 220 and the first side wall 111 better in overall structural compatibility. Such a design eliminates poor contact and unstable connection caused by thickness differences between the upper and lower parts. When the battery shell assembly 10 experiences thermal expansion or contraction during operation, the same thickness will help achieve consistency in material thermal deformation, further reducing the risk of local stress concentration caused by temperature changes. By optimizing the force distribution, the probability of component damage caused by external forces is reduced, improving the durability and reliability of the entire battery shell assembly 10.

[0098] In an embodiment, the minimum cross-sectional area 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㎡.

[0099] 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㎡, it can ensure that when the battery experiences abnormal conditions such as thermal runaway or overpressure, the internal gas can be quickly discharged through the pressure relief hole, preventing the shell 100 from rupturing or exploding due to excessive internal pressure. This design effectively improves the safety protection capability of the battery shell assembly 10 and reduces the risk of safety accidents.

[0100] 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 to be 0.18㎡, 0.20㎡, 0.22㎡, 0.25㎡ or larger, and the specific value is determined according to factors such as battery capacity, gas generation rate, pressure relief requirements, etc. When the area of the pressure relief hole 221 is less than 0.18㎡, the pressure relief channel may be limited, the gas discharge speed may be insufficient, and the internal pressure may not be quickly released, increasing the safety hazard.

[0101] Referring to Figure 6In the embodiment shown in (a), the pressure relief hole 221 is designed as a strip-shaped hole. This shape has the advantage of effectively improving the discharge efficiency of the gas, 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, ensuring better pressure relief effect without affecting the performance of the battery.

[0102] Referring to Figure 6 In the embodiment shown in (b), 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 requirement for machining precision during manufacturing. The uniform distribution of the circular hole helps the gas to diffuse quickly, avoiding the safety hazards caused by excessive local pressure.

[0103] In a preferred embodiment, the pressure relief cover 210 is coaxially arranged with the pressure relief hole 221.

[0104] In this embodiment, the pressure relief cover 210, as a key component of the battery housing assembly 10, is responsible for effectively discharging the gas when the internal pressure is too high. The coaxial arrangement with the pressure relief hole 221 can optimize the airflow channel during the pressure relief process, ensuring that the gas is quickly and smoothly discharged from the internal space, thereby reducing the internal pressure and preventing 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 coaxially aligned with it, reducing the resistance caused by the change of airflow direction. This flow characteristic not only increases the efficiency of pressure relief, but also quickly responds to changes in internal pressure, improving the safety of the entire battery housing assembly 10 in emergency situations.

[0105] In an embodiment, the adhesive member 230 is a heat-sensitive adhesive.

[0106] By using a heat-sensitive adhesive material with a preset melting point to make the adhesive member 230, it can effectively melt when the battery experiences thermal runaway, thereby quickly forming a pressure relief channel to ensure timely release of the gas and reduce the risk of internal pressure. Specifically, the adhesive member 230 can be at least one of polyethylene, polyvinyl chloride, polystyrene, polyamide, polycarbonate, and polyphenyl ether.

[0107] In an embodiment, the shell 100 is a rectangular body and can be applied to a rectangular battery. Specifically, the shell 100 includes a middle frame 110 provided with two openings, and a shell wall including two cover plates 120 fixedly connected with the middle frame 110 to respectively seal the two openings; the middle frame 110 and the cover plates 120 form a containing cavity; the shell wall further includes a first shell wall 112; the middle frame 110 includes a first side wall 111 and the first shell wall 112 connected with the first side wall 111, and 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 shell wall 112 are integrally formed. Such a design reduces the number of connection points and reduces the risk of damage caused by stress concentration.

[0108] In this embodiment, the rectangular design of the shell 100 provides superior space utilization, effectively accommodating larger capacity battery cells and ensuring the stability of the overall structure. The combination of the middle frame 110 and the cover plate 120 forms a good sealing performance, thereby protecting the internal battery elements from the external environment and enhancing the reliability of the device. In the above embodiment, the middle frame 110 and the cover plate 120 are generally planar structures, of course, in some embodiments, when the battery shell assembly 10 is applied to a cylindrical battery, the pressure relief structure 200 can also be provided on the end face of the cylindrical shell 100, which is not described here.

[0109] In an embodiment, the middle frame 110 can be a one-piece, which 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 is no additional connection point, the potential leakage risk caused by the insufficient airtightness of the connection is avoided, which is crucial for the sealing performance of the battery shell.

[0110] In addition, the middle frame 110 and one of the cover plates 120 can also be a one-piece, which can further enhance the stability and sealing effect of the shell. The integrated structure not only reduces the number of components, but also improves the overall durability and reliability, while reducing assembly time and cost.

[0111] It should be noted that by using the connecting piece 220 to carry the pressure relief cover 210, when assembling the battery shell assembly 10, the pressure relief cover 210 can be first connected with the connecting piece 220 to form a modular structure, and then the modular structure is installed in the mounting hole 1111, and after the connecting piece 220 is connected with the shell 100 to form the battery shell assembly 10, the assembly efficiency is improved.

[0112] In an embodiment, the middle frame 110 of the housing 100 can be directly cut to remove the connecting piece 220 when the connecting piece 220 is processed, so that the processing efficiency is improved and the material cost is saved.

[0113] In an 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 polyline, or a combination of a curve and a polyline. This diversified structure design not only improves the fluid dynamics performance of the pressure relief hole 221, but also effectively improves the flow characteristics of the gas, thereby enhancing the use reliability and safety of the entire pressure relief structure 200.

[0114] Specifically, when the side of the pressure relief hole 221 is a smooth curve, the gas can flow quickly and smoothly when passing through the hole, reducing the phenomenon of sharp pressure drop and turbulence. In fluid mechanics, the continuity of the flow line is a key factor affecting the flow efficiency, and the smooth curve can effectively reduce the flow resistance and improve the pressure relief speed. This design can ensure that the gas can be released from the containing cavity in time and effectively under high pressure conditions, thereby reducing the internal pressure and avoiding structural damage caused by excessive pressure.

[0115] On the other hand, when the side is a polyline or a combination of a curve and a polyline, the shape of the hole can cleverly guide the fluid flow. This design can increase the complexity of the flow path, thereby improving the contact time of the gas with the hole wall, thereby enhancing the heat exchange and release effect of the gas. At the same time, the design of the polyline also helps to guide the gas flow in a specific direction, avoiding the generation of gas flow dead zones. If the flow speed is too fast during the pressure relief operation, it may cause gas flow vortex, and the selection of the polyline shape can reduce this risk, so that the fluid flows more regularly.

[0116] 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 high-pressure conditions, the side design of the pressure relief hole 221 can preferentially adopt a curve, which can maintain good flow performance under different conditions; while in some devices that efficiently utilize the pressure relief path, the polyline structure may be more optimal, because this design can reasonably control the pressure relief flow rate and reduce the pressure fluctuation caused by nonlinear flow.

[0117] It is noted that although the design of the curve, the broken line or the combination of both is selected, the specific shape and structure parameters should be adjusted according to the specific application conditions of the pressure relief structure 200 and the required pressure relief performance to ensure that the optimal permission requirements and safety levels are met. 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 to ensure that the pressure relief hole 221 performs excellently when dealing with internal overpressure.

[0118] Referring to Figure 2 As shown in the embodiment, the housing 100 has a first side surface m1, and the opening of the mounting hole 1111 is located on one side surface m1 of the housing 100. By this arrangement, the mounting hole 1111 can be formed by stamping on the middle frame 110, so that the connecting piece 220 is separated from the middle frame 110, thereby effectively improving the processing efficiency.

[0119] This stamping method not only reduces material waste, but also simplifies the processing steps, enabling mass production and reducing 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, it also ensures the processing accuracy of each housing 100, thereby improving the quality stability of the overall product.

[0120] In the specific embodiment, the middle frame 110 can be stamped with steel, aluminum alloy or high-strength metal and other materials, and the specific selection is determined according to the strength requirements of the product and the use environment. For example, using aluminum alloy as the material not only reduces the overall weight, but also has good corrosion resistance, which helps to improve the service life of the equipment. At the same time, the edges of the mounting hole 1111 after stamping are deburred to ensure safety.

[0121] Referring to Figure 4 As shown in another embodiment, the mounting hole 1111 is arranged to penetrate the first side wall 111 of the housing 100 at least on the 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 mounting hole 1111 can be directly cut on the middle frame 110 along the direction of the second side surface m2 to the third side surface m3 to form the mounting hole 1111, so that the mounting hole 1111 penetrates the first side surface m1. This design not only simplifies the processing flow, but also improves the processing efficiency.

[0122] With the above arrangement, the connecting member 220 can be directly welded with the upper cover plate 120 and the lower cover plate 120, and the middle frame 110 does not need to reserve a distance in the width direction of the connecting member 220. In this way, the size of the overall structure of the battery case assembly 10 is greatly reduced, and the space utilization is improved. In addition, since the unnecessary reserved distance is eliminated, the rigidity and stability of the connection are enhanced, and the quality and strength of the welding are improved.

[0123] Referring to Figure 5 In one embodiment, as shown in (c), the design of the mounting hole 1111 includes a positioning groove portion 11111 and a through groove portion 11112 connected thereto, which form a stepped groove type mounting hole 1111. This design allows the connecting member 220 to be effectively limited by the positioning groove portion 11111 when the pressure relief structure 200 is assembled. This limiting function significantly improves the assembly convenience and accuracy of the pressure relief structure 200, reduces assembly problems caused by position errors, and improves the reliability of the overall device.

[0124] 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 accurate positioning of the connecting member 220. With this arrangement, the dependence on the skills of the operator during assembly can be effectively reduced, and the assembly process is simplified. At the same time, since the connecting member 220 can be stably embedded in the positioning groove portion 11111, the risk of loosening and falling off during use is reduced, further improving the stability and safety of the product.

[0125] 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 assembly efficiency and optimizing the overall production process.

[0126] In one embodiment, at least part of the adhesive member 230 is arranged circumferentially around the pressure relief hole 221, and the adhesive member 230 is at least partially sandwiched between the pressure relief cover 210 and the connecting member 220.

[0127] In this embodiment, the sealing performance of the pressure relief structure 200 is effectively improved through the wrap-around arrangement, making the mutual combination between the pressure relief cover 210 and the connecting piece 220 more compact. As the heat accumulates during the charging and discharging process of the battery, the internal pressure may rise sharply, and if the pressure relief hole 221 fails to release the internal pressure in time, it may cause the battery shell assembly 10 to deform or explode. The wrap-around arrangement of the adhesive piece 230 forms a complete closed state between the connecting piece 220 and the pressure relief cover 210 using adhesive material. This not only avoids the risk of leakage 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 and high pressure). In addition, when the battery is in an extreme working state, the adhesive piece 230 softens or melts when the temperature exceeds the preset value, quickly and effectively forming 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 piece 230 between the pressure relief cover 210 and the connecting piece 220, the pressure relief cover 210 can be fixed to the connecting piece 220 through the adhesive piece 230, and the adhesive piece 230 can soften or melt when the temperature exceeds the preset temperature to form a gas channel between the pressure relief cover 210 and the connecting piece 220.

[0128] In addition, this wrap-around design also helps to evenly distribute stress, reduce the potential risks of concentrated stress, reduce the possibility of adhesive failure caused by uneven material expansion due to temperature changes, and enhance the stability of the overall system. Therefore, the wrap-around arrangement of the adhesive piece 230 not only improves the sealing performance, but also helps to ensure that the battery maintains good safety and reliability during long-term and high-frequency operation.

[0129] In an embodiment, the thickness of the adhesive piece 230 arranged between the pressure relief cover 210 and the connecting piece 220 is in the range of [0.04mm, 0.5mm]. This thickness range is chosen to optimize the adhesive effect while preventing adhesive failure caused by the heat-affected zone of welding. The design of the adhesive piece 230 allows the appropriate thickness to be selected during production according to specific needs to meet the requirements of different battery monomers in terms of structural strength and thermal stability. In addition, the adhesive piece 230 can include one or more layers of structure, and this flexibility allows the design to be adjusted according to different application scenarios, thereby improving the adaptability and safety of the product.

[0130] Of course, when the adhesive piece 230 adopts a multi-layer structure, different materials with different properties can be applied in different layers, for example, a polymer with good high-temperature resistance is used in the outer layer, and a material with excellent adhesion performance is used in the inner layer. The advantage of such a composite structure is that the properties of the materials in each layer can be combined to enhance the performance of the entire adhesive piece and improve its reliability in high-temperature and high-pressure environments.

[0131] Through reasonable design, the adhesive 230 can not only provide strong bonding effect, but also effectively isolate heat conduction in the welding process, reducing the risk of material failure caused by heat effect. It should be noted that the thickness of the adhesive 230 can be 0.04mm, 0.10mm, 0.20mm, 0.30mm, 0.5mm, of course, as the thickness of the adhesive 230 increases, the overall thickness of the pressure relief structure 200 will also increase, the specific thickness of the adhesive 230 can be determined according to the design requirements of the battery shell assembly 10, which will not be repeated here.

[0132] Referring to Figure 5 (a) and Figure 5 (b), at least part of the adhesive 230 is also accommodated in the pressure relief hole 221.

[0133] In this way, the sealing performance of the pressure relief hole 221 can be further improved, and the connection strength between the pressure relief cover 210 and the connecting piece 220 can be further improved due to the increased bonding range of the adhesive 230, ensuring the stability and reliability of the pressure relief structure 200 during use. Part of the adhesive 230 is accommodated inside the pressure relief hole 221, which helps to form a more uniform pressure distribution area, thereby reducing the risk of damage to the pressure relief hole 221 due to high pressure or thermal expansion.

[0134] In terms of specific implementation, the material of the adhesive 230 can be a polymer with good flexibility, which can adapt to environmental changes during 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 adhesive 230 not only effectively supports the shape of the pressure relief hole, but also increases its compression strength to some extent.

[0135] It should be noted that in general, the pressure relief cover 210 and the adhesive 230 will have some overflow after hot pressing, and the edge of the overflow is usually controlled within 0.15mm, that is, the adhesive 230 may overflow the outer edge of the pressure relief cover 210.

[0136] Further, the pressure relief cover 210 and the connecting piece 220 are arranged in close contact, and the adhesive 230 is at least partially accommodated in the pressure relief hole 221 and connected to the pressure relief cover 210 and the connecting piece 220 respectively. This structure design not only achieves good contact sealing effect, but also effectively reduces the thickness of the pressure relief structure 200 in the shell 100.

[0137] In addition, the adhesive 230 forms a high-strength adhesive state during the connection of the pressure relief cover 210 and the connecting piece 220. This adhesive state can effectively resist external impact and vibration, ensuring that the pressure relief cover can work stably in high-temperature or high-pressure environments, thereby improving the overall safety performance of the battery. By reasonably designing the material and thickness of the adhesive, the pressure bearing range of the pressure relief structure 200 can be further optimized, providing greater safety assurance for the product.

[0138] Specifically, the adhesive 230 includes a connecting glue part 231, which is arranged around the inner wall of the pressure relief hole 221 and is sealingly connected to the side of the pressure relief cover 210 close to the pressure relief hole 221.

[0139] Through this design, the bonding area of the adhesive 230 is effectively increased, which not only improves the adhesion effect of the adhesive 230, but also enhances the sealing performance of the entire pressure relief structure 200. The surrounding structure of the connecting glue part 231 promotes 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 part 231, so that the adhesion strength is significantly enhanced during use. When the battery generates heat during charging and discharging, causing the internal pressure to rise, the increased bonding area can effectively resist pressure changes and prevent the possibility of adhesion failure, thereby ensuring the effectiveness of the pressure relief structure under extreme conditions.

[0140] Further, as shown in (b) of FIG. 2, Figure 5 Further, as shown in (b) of FIG. 2,

[0141] In this embodiment, the pressure relief cover 210 can be attached to the outer surface of the connecting piece 220 and connected to the pressure relief cover 210 and the pressure relief hole 221 through the connecting glue part 231 to fix the pressure relief cover 210.

[0142] Further, the design and material selection of the connecting piece 220 play a key role in the present application. The design of the connecting piece 220 needs to meet the strength and corrosion resistance requirements in the pressure relief structure 200. Specifically, the connecting piece 220 can be selected according to the actual application, for example, aluminum alloy, stainless steel or titanium alloy, etc. The selection of these materials can effectively improve the reliability and durability of the connecting piece 220 under different environmental conditions. In specific implementation, aluminum alloy is suitable for lighter loads due to its light weight and good corrosion resistance; stainless steel has higher strength and high-temperature resistance, which is very suitable for use in high-temperature or high-pressure environments.

[0143] In addition, when selecting materials, the specific conditions of the working environment, such as temperature changes, pressure fluctuations, and the chemical properties of the contact medium, should also be considered for targeted optimization selection to ensure that the connecting piece 220 can work efficiently and stably under various working conditions. Through such material selection and optimization, the performance of the connecting piece 220 can be maximized to better adapt to different application requirements, thereby improving the reliability and service life of the overall device.

[0144] The application also provides a battery, which comprises the battery shell assembly 10 in any of the preceding embodiments and a battery cell. The battery cell is accommodated inside the battery shell assembly 10.

[0145] In this embodiment, the battery shell assembly 10 is matched with the connecting piece 220 by providing a mounting hole 1111 on the shell 100, thereby achieving excellent assembly effect. When the connecting piece 220 is accommodated in the mounting hole 1111 during assembly, compared with the pressure relief mechanism in the traditional battery, the design of the application can effectively reduce the protrusion height of the pressure relief structure 200 on the outer surface of the shell 100. This design optimization makes the overall structure of the battery shell 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.

[0146] The battery provided by the application can be widely applied to electronic devices such as mobile phones, wearable electronic products, tablet computers, and notebook computers, which have high requirements for the thinness and safety of the battery. By combining the above battery shell assembly 10 with the battery cell, the performance requirements of the electronic device are met while the good heat dissipation and excellent pressure resistance of the battery are ensured. In addition, this design also provides convenience for the production and assembly of the battery, further improving the manufacturing efficiency and quality control.

[0147] In this embodiment, the shell is made of metal material, specifically stainless steel, titanium alloy, nickel alloy, chromium alloy, or aluminum alloy. These metal materials have excellent mechanical strength and corrosion resistance, which can effectively protect the internal components of the battery. The material of the connecting piece 220 and the shell 100 is consistent, both of which are metal materials, which can ensure good welding effect. In the preferred case, the connecting piece 220 and the shell 100 are both made of titanium alloy material, which not only helps to reduce the weight of the overall structure, but also provides higher strength. The use of titanium alloy material has low deformation risk during welding processing, thereby enhancing its safety and service life.

[0148] The application also provides an electric device, which comprises an electric device and the battery in any of the preceding embodiments; the electric device is electrically connected to the battery.

[0149] Of course, the power consuming device can also be a battery assembly, in which case the power consuming device can include a plurality of batteries according to the present application, and a circuit structure, the batteries being electrically connected to the circuit structure. The power consuming device described above can also be the circuit structure.

[0150] It can be understood that, in the power consuming device of the present embodiment, by arranging the battery according to any one of the embodiments described above, the battery shell assembly 10 of the present embodiment cooperates with the connecting piece 220 by arranging the mounting hole 1111 on the shell 100, and the connecting piece 220 can be accommodated in the mounting hole 1111 during assembly. Compared with the pressure relief mechanism in a conventional battery, the protrusion height of the pressure relief structure 200 on the outer surface of the shell 100 can be reduced, so that the overall structure of the battery shell assembly 10 is more compact, the occupied space in the power consuming device is reduced, and the use safety of the power consuming device is ensured.

[0151] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0152] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0153] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature "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 in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0154] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the embodiments of the present application. In the description of the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction, and the spirit and scope of the technical solutions of the embodiments of the present application are not deviated.

[0155] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions 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 an accommodating 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) is provided with a mounting hole (1111) communicating with the accommodating cavity; as well as A pressure relief structure (200) comprises 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 the pressure relief cover (210) is sealed and disposed in the mounting hole (1111); The adhesive member (230) is configured to soften, melt, or vaporize when the temperature exceeds a preset temperature, thereby generating a gas channel between the pressure relief cover (210) and the first side wall (111); The pressure relief structure (200) further comprises a connecting piece (220), the connecting piece (220) being provided with a pressure relief hole (221) penetrating the connecting piece (220) in a thickness direction thereof, the adhesive piece (230) being respectively connected to the pressure relief cover (210) and the connecting piece (220), so that the pressure relief cover (210) is sealed and disposed on the pressure relief hole (221); In the thickness direction of the pressure relief structure (200), the outer peripheral edge of the orthographic projection of the adhesive member (230) is located within the orthographic projection of the connecting member (220), and in 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 peripheral edge of the adhesive member (230) is greater than or equal to 1.2 mm, and 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; The connecting member (220) is accommodated in the mounting hole (1111) of the housing (100); the connecting member (220) and the first side wall (111) are connected by welding to form a weld (222); in the thickness direction of the pressure relief structure (200), the connecting member (220) includes two surfaces facing each other along the thickness direction of the pressure relief structure (200); and the first side wall (111) includes 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) and a surface of the first side wall (111) close to the pressure relief cover (210) are coplanar; The thickness of the connecting member (220) is the same as the thickness of the first side wall (111).

2. The battery housing assembly (10) according to claim 1, characterized in that The connecting member (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 located within the orthographic projection of the adhesive component (230).

4. The battery housing assembly (10) according to claim 1, 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) is in the range of [80µm, 165µm].

5. The battery housing assembly (10) according to claim 1, characterized in that The adhesive (230) and the weld (222) are spaced apart, 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.

6. The battery housing assembly (10) according to claim 1, characterized in that The connecting piece (220) is made of the same material as the first side wall (111).

7. The battery housing assembly (10) according to claim 1, 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.

8. The battery housing assembly (10) according to claim 7, 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.

9. The battery housing assembly (10) according to claim 1, characterized in that The pressure relief cover (210) and the pressure relief hole (221) are coaxially arranged.

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

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

12. 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) are fixedly connected to the middle frame (110) to respectively close the two openings; 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.

13. The battery housing assembly (10) according to claim 12, characterized in that: The middle frame (110) is an integral piece, or the middle frame (110) and one of the cover plates (120) are an integral piece.

14. The battery housing assembly (10) according to any one of claims 1 to 13, 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).

15. The battery housing assembly (10) according to claim 14, characterized in that The thickness of the adhesive member (230) sandwiched between the pressure relief cover (210) and the connecting member (220) has a value range of [0.04 mm, 0.5 mm].

16. The battery housing assembly (10) according to claim 14, characterized in that At least a portion of the adhesive component (230) is also accommodated in the pressure relief hole (221).

17. The battery housing assembly (10) according to any one of claims 1 to 13, 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 respectively connects the pressure relief cover (210) and the connecting piece (220).

18. The battery housing assembly (10) according to claim 17, characterized in that The adhesive component (230) comprises a connecting adhesive portion (231), the connecting adhesive portion (231) being connected around the inner wall of the pressure relief hole (221), and the connecting adhesive portion (231) being sealed to a side of the pressure relief cover (210) close to the pressure relief hole (221).

19. The battery housing assembly (10) according to claim 18, 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).

20. The battery housing assembly (10) according to claim 19, characterized in that The fixed rubber portion (232) is circumferentially arranged around the pressure relief hole (221).

21. A battery, characterized in that: include: The battery housing assembly (10) according to any one of claims 1 to 20; as well as The battery cell is accommodated in the battery housing assembly (10).

22. An electrical device, characterized in that: Comprising the battery of claim 21.

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