Shell structure and battery

Abstract

The utility model discloses a shell structure and a battery. The shell structure comprises a shell main body, a pressure relief hole and a sealing element, the shell main body is used for accommodating the battery cell assembly; the pressure relief hole is formed in the shell main body; the sealing piece comprises a connecting piece and hot melt adhesive, the connecting piece is provided with a first through hole, the first through hole is filled with the hot melt adhesive, the sealing piece is connected with the shell body, and the first through hole corresponds to the pressure relief hole in position. Wherein the hole wall of the first through hole protrudes to form a supporting surface and the hot melt adhesive is attached to the supporting surface, and / or the hole wall of the first through hole is sunken to form a supporting surface and the hot melt adhesive is attached to the supporting surface. The shell structure provided by the utility model can simultaneously meet the mechanical drop and hot box test requirements of the battery cell assembly, and can generate a response to thermal runaway in time.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, especially a kind of shell structure and battery. BACKGROUND

[0002] Hot box test is an important method to evaluate the performance and safety of battery under high temperature or extreme temperature conditions. However, the current market battery explosion-proof valve design is mainly aimed at mechanical impact and other physical impact, and it is insufficient to deal with thermal runaway under high temperature environment.

[0003] Traditional explosion-proof valve design, such as piston type explosion-proof valve and needle type explosion-proof valve, can release gas when the internal pressure of the battery is too high to prevent the battery from exploding. Specifically, when the internal pressure of the battery is too high, the explosion-proof valve will be blown off, so that the internal environment of the battery is connected to the external environment through the blown-off explosion-proof valve to achieve pressure relief.

[0004] Traditional explosion-proof valve needs to be blown off when the internal pressure of the battery reaches a certain level, but in some cases, the battery has already experienced thermal runaway, but the air pressure has not reached the condition to blow off the explosion-proof valve, so at this time the explosion-proof valve has not been blown off, and the internal environment pressure of the battery cannot be released. Therefore, the traditional explosion-proof valve is difficult to respond to temperature in time, which increases the risk of thermal runaway of the battery. SUMMARY

[0005] The main purpose of the utility model is to provide a shell structure and battery, which can meet the requirements of mechanical drop and hot box test at the same time and respond to temperature in time.

[0006] To achieve the above-mentioned purpose, the first aspect of the utility model provides a shell structure, comprising:

[0007] A shell body for accommodating a battery cell assembly;

[0008] A pressure relief hole provided in the shell body;

[0009] A sealing element comprising a connecting element and a hot melt adhesive, the connecting element is provided with a first through hole, the hot melt adhesive fills the first through hole, the sealing element is connected to the shell body, and the position of the first through hole corresponds to the position of the pressure relief hole;

[0010] Wherein, the hole wall of the first through hole is protruded to form a support surface, and the hot melt adhesive is attached to the support surface, and / or the hole wall of the first through hole is recessed to form a support surface, and the hot melt adhesive is attached to the support surface.

[0011] In some embodiments, the sealing element comprises a flange, the flange is provided on the hole wall of the first through hole, and the flange is protruded along the radial direction of the first through hole, and the surface wall of the flange is configured as a support surface.

[0012] In some embodiments, the flange surrounds a hole wall of the first through hole to form a second through hole, and a relationship between a hole diameter R1 of the first through hole and a hole diameter R2 of the second through hole satisfies: R2≤R1.

[0013] In some embodiments, the hole diameter R2 of the second through hole satisfies: 1.0mm≤R2≤3.0mm.

[0014] In some embodiments, a distance H1 from the surface of the flange away from the one side of the shell body to the surface of the connecting piece away from the one side of the shell body satisfies: 0.05mm≤H1≤0.2mm.

[0015] In some embodiments, along the axial direction of the first through hole, the surface of the connecting piece towards the one side of the shell body and the surface of the hot melt adhesive towards the one side of the shell body are located in the same plane.

[0016] In some embodiments, along the axial direction of the first through hole, a thickness H2 of the connecting piece and a thickness H3 of the hot melt adhesive satisfy a relationship: H2≤H3.

[0017] In some embodiments, the shell body includes a bottom wall and a side wall surrounding the bottom wall, the bottom wall and the side wall together define a containing cavity for containing the battery cell assembly, and the first through hole is arranged on the side wall.

[0018] Embodiments of the second aspect of the present application provide a battery, including the shell structure of any one of the foregoing embodiments, and the battery further includes a pole, the shell body includes a bottom wall and a side wall surrounding the bottom wall, the bottom wall and the side wall together define a containing cavity, the side wall is provided with a third through hole, the pole is arranged through the third through hole, and the pole protrudes away from the containing cavity on the side of the side wall along the axial direction parallel to the first through hole, and along the axial direction of the first through hole, a distance from an end of the connecting piece to the side wall is less than or equal to a distance from an end of the pole to the side wall.

[0019] In some embodiments, the distance from the end of the connecting piece to the side wall is configured as a thickness H2 of the connecting piece, and the thickness H2 of the connecting piece satisfies: 0.2≤H2≤2.0mm.

[0020] According to the above-mentioned embodiments, the battery has the following beneficial effects:

[0021] The housing structure of this application includes a housing body, a pressure relief hole, and a sealing element. The housing body houses the battery cell assembly, ensuring its safety and stability. The pressure relief hole is located in the housing body; when the internal pressure is too high, pressure can be released through the pressure relief hole to prevent the housing from rupturing. The sealing element includes a connector and hot melt adhesive. The connector has a first through hole, which is filled with hot melt adhesive. The sealing element connects to the housing body, and the positions of the first through hole and the pressure relief hole correspond, ensuring that gas can be discharged through the first through hole and the pressure relief hole when needed. The wall of the first through hole protrudes to form a support surface, or the wall of the first through hole is recessed to form a support surface, and the hot melt adhesive adheres to the support surface. This design increases the contact area between the hot melt adhesive and the connector through the support surface, thereby making the bond between the solid hot melt adhesive and the connector stronger and reducing the possibility of the hot melt adhesive detaching from the connector under normal operating conditions, which would expose the openings of the first through hole and the pressure relief hole. Therefore, the design of this application can improve the mechanical stability of the sealing element, making the housing structure more stable and safer in actual use.

[0022] The sealing element of this application is composed of a connector with a first through hole and hot melt adhesive filled in the first through hole. The advantage of this composite structure is twofold: firstly, when the battery cell assembly expands due to impact, the pressure will force open the hot melt adhesive filled in the first through hole, allowing the internal environment to communicate with the outside through the first through hole and the pressure relief hole, achieving a pressure relief effect; secondly, when the battery cell assembly inside the shell heats up severely, causing the internal temperature to exceed the melting point of the hot melt adhesive, the hot melt adhesive melts, changing from a solid to a liquid state and flowing out of the first through hole, releasing the pressure. This allows the internal environment to communicate with the outside through the first through hole and the pressure relief hole, achieving a pressure relief effect. In summary, the shell structure of this application can simultaneously meet the requirements of mechanical drop and hot chamber testing of the battery cell assembly, and can respond promptly to thermal runaway.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the shell structure in one embodiment of the present invention;

[0026] Figure 2 yes Figure 1An exploded structural schematic view of the middle shell structure;

[0027] Figure 3 is Figure 2 An enlarged view at middle A;

[0028] Figure 4 is Figure 1 A sectional structural schematic view of the middle shell structure;

[0029] Figure 5 is Figure 4 An enlarged view at middle B;

[0030] Figure 6 is a sectional structural schematic view of the sealing element in an embodiment of the present application;

[0031] Figure 7 is Figure 6 A sectional structural schematic view of the sealing element after hiding the hot melt glue;

[0032] Figure 8 is Figure 6 An illustrative view of parameters of the sealing element;

[0033] Figure 9 is a structural schematic view of the sealing element in another embodiment of the present application.

[0034] Explanation of reference numerals:

[0035] Shell body 100; bottom wall 110; side wall 120; third through hole 121;

[0036] Pressure relief hole 200;

[0037] Sealing element 300; connecting element 310; hot melt glue 320; first glue section 321; second glue section 322; third glue section 323; flange 330; second through hole 331; first through hole 340; hole wall 341;

[0038] Pole 400.

[0039] The realization, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0041] It should be noted that if the embodiments of the utility model have directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture, if the specific posture changes, the directionality indication also changes accordingly.

[0042] In addition, if the embodiments of the utility model have the description of "first", "second" and the like, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, if "and / or", "and / or" or "and / or" appears in the whole text, it means that the three parallel schemes include "A and / or B", including A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary technical personnel in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the utility model.

[0043] The shell structure and the battery according to the embodiments of the utility model will be described below with reference to Figures 1 to 9 The shell structure and the battery according to the embodiments of the utility model will be described below with reference to Figures 1 to 5 The first aspect of the application provides a shell structure, which comprises a shell body 100, a pressure relief hole 200 and a sealing element 300. The shell body 100 is used to accommodate the battery cell assembly, ensuring the safety and stability of the battery cell assembly. The pressure relief hole 200 is provided in the shell body 100, which can release the pressure when the internal pressure is too large, preventing the shell from breaking. The sealing element 300 comprises a connecting element 310 and a hot melt adhesive 320, the connecting element 310 is provided with a first through hole 340, and the hot melt adhesive 320 fills the first through hole 340. The sealing element 300 is connected to the shell body 100, and the position of the first through hole 340 corresponds to that of the pressure relief hole 200, ensuring that the gas can be discharged through the first through hole 340 and the pressure relief hole 200 when needed. The hole wall 341 of the first through hole 340 is protruded to form a supporting surface, or the hole wall 341 of the first through hole 340 is recessed to form a supporting surface, and the hot melt adhesive 320 is attached to the supporting surface. In this way, the attachment area of the hot melt adhesive 320 and the connecting element 310 can be increased through the supporting surface, so that the combination of the solid hot melt adhesive 320 and the connecting element 310 is more firm, reducing the situation that the hot melt adhesive 320 is detached from the connecting element 310 under normal working conditions, causing the opening of the first through hole 340 and the pressure relief hole 200 to be exposed. Therefore, the design of the application can improve the mechanical stability of the sealing element 300, making the shell structure more stable and safe in actual use.

[0044] It can be understood that the sealing member 300 of the present application is composed of the connecting member 310 with the first through hole 340 and the hot melt adhesive 320 filled in the first through hole 340. The advantage of this composite structure is that, on the one hand, when the battery cell assembly is subjected to impact and expands, the pressure will push away the hot melt adhesive 320 filled in the first through hole 340, so that the environment in the shell is communicated with the outside through the first through hole 340 and the pressure relief hole 200, achieving the effect of pressure relief; on the other hand, when the battery cell assembly in the shell generates serious heat, so that the temperature in the shell exceeds the melting point of the hot melt adhesive 320, the hot melt adhesive 320 melts under heat, that is, the hot melt adhesive 320 changes from solid to liquid and flows out of the first through hole 340, so that the first through hole 340 is released, and thus the environment in the shell can be communicated with the outside through the first through hole 340 and the pressure relief hole 200, achieving the effect of pressure relief. In summary, the shell structure of the present application can meet the requirements of mechanical drop and thermal box test of the battery cell assembly, and can respond to thermal runaway in time.

[0045] It can be understood that in some embodiments, the selection of the hot melt adhesive 320 can be adjusted according to the actual use environment and temperature range to ensure that it can maintain good bonding performance under high temperature or low temperature conditions. For example, the hot melt adhesive 320 is configured to melt under heat between 120 degrees Celsius and 180 degrees Celsius.

[0046] The specific shape of the convex or concave support surface of the hole wall 341 can be diversified. In some embodiments, the hole wall 341 can be designed in a spiral shape, a wave shape or other complex shapes to increase the contact area with the hot melt adhesive 320 and further enhance the sealing performance.

[0047] In some embodiments, the material of the hole wall 341 also affects the sealing effect. By selecting a specific material for the hole wall 341, the penetration of the hot melt adhesive 320 is reduced, and the service life is prolonged. For example, the connecting member 310 can be metal, and the surface of the hole wall 341 for contacting the hot melt adhesive 320 is made of metal. It can be understood that the degree of cooperation between the hole wall 341 and the hot melt adhesive 320 is also one of the key factors affecting the sealing effect. The roughness of the hole wall 341, the affinity of the hole wall 341 and the hot melt adhesive 320, etc. are all factors to be considered. For example, in some embodiments, a hole wall 341 with a larger roughness is provided to strengthen the bonding strength of the hot melt adhesive 320 and the connecting member 310.

[0048] It can be understood that the hole wall 341 of the first through hole 340 can be protruding, which can be a plurality of spaced protrusions, can be a spaced protrusion, or can be a flange 330 surrounding the inner wall of the first through hole 340, as long as it can provide more bonding area for the hot melt adhesive 320. Of course, for the structure in which the hole wall 341 of the first through hole 340 is recessed to form a support surface, the first through hole 340 can be recessed with a plurality of deep holes, or a recess or a plurality of recesses surrounding the hole wall 341 of the first through hole 340, etc., to provide more area for the hot melt adhesive 320 to bond.

[0049] For the design of the pressure relief hole 200, it can be a circular hole, a square hole, or other special-shaped holes. The pressure relief hole 200 serves to communicate the inside and outside environments of the shell structure. For the design of the pressure relief hole 200, on the one hand, it is convenient for processing to save costs, and on the other hand, it also needs to consider the influence of the pressure relief hole 200 on the rigidity of the shell body 100. A reasonable shape and a reasonable caliber of the pressure relief hole 200 are set to ensure good conductivity while having little influence on the structural rigidity of the shell itself.

[0050] Referring to Figure 6 and Figure 8 In some embodiments, the sealing member 300 includes a flange 330, which is provided on the hole wall 341 of the first through hole 340 and protrudes radially along the first through hole 340. The upper and lower surfaces of the flange 330 are configured as support surfaces to provide more bonding area for the hot melt adhesive 320, thereby ensuring the stability of the combination of the hot melt adhesive 320 and the connecting member 310 and preventing the hot melt adhesive 320 from falling off during long-term use. On the other hand, this design can also enhance the structural strength of the sealing member 300 to prevent deformation when subjected to external impact or internal pressure changes. Therefore, the presence of the flange 330 increases the overall rigidity of the sealing member 300 and improves its durability and reliability.

[0051] It can be understood that in some embodiments, the shape of the flange 330 can be circular, square, polygonal, etc., and different shapes are suitable for different use scenarios and requirements. For example, a circular flange 330 is suitable for occasions requiring uniform stress distribution, while a square or polygonal flange 330 can provide stronger support force in certain specific directions.

[0052] It can be understood that in some embodiments, the size and position of the flange 330 are also important factors to be considered in the design. The radial protrusion degree of the flange 330 can be appropriately adjusted to adapt to different installation spaces and sealing requirements. For example, when the installation space is limited, a smaller flange 330 can be designed, while a larger flange 330 can be designed when stronger support force is required.

[0053] In addition, the material of the flange 330 can be diversified, and metal, plastic or other polymer materials can be selected to meet different mechanical properties and chemical stability requirements.

[0054] In some embodiments, the flange 330 can be integrally formed with the connecting piece 310, that is, the flange 330 is part of the connecting piece 310. In some embodiments, the flange 330 and the connecting piece 310 are independently formed, and the combination of the flange 330 and the connecting piece 310 can be achieved by welding, bonding or mechanical fastening, etc., to ensure the reliability and stability of the connection.

[0055] Referring to Figure 6 and Figure 8 In some embodiments, the flange 330 surrounds the hole wall 341 of the first through hole 340 to form a second through hole 331, and the relationship between the hole diameter R1 of the first through hole 340 and the hole diameter R2 of the second through hole 331 satisfies: R2≤R1, that is, the hole diameter R1 of the first through hole 340 is greater than or equal to the hole diameter R2 of the second through hole 331.

[0056] When the internal pressure of the battery exceeds a certain threshold, the hot melt adhesive 320 is melted by heat, so that the first through hole 340 and the pressure relief hole 200 are communicated, thereby releasing the internal pressure. The design of the flange 330 increases the contact area of the hot melt adhesive 320 with the connecting piece 310, and improves the stability of the hot melt adhesive 320.

[0057] In some embodiments, the flange 330 is thick, and is connected with the connecting piece 310 by welding or other methods with high stability. When the battery cell assembly in the shell structure needs to release pressure, the hot melt adhesive 320 is flushed out, the second through hole 331 and the pressure relief hole 200 are communicated, so as to achieve the purpose of pressure relief.

[0058] In some embodiments, the flange 330 is thin, and is connected with the connecting piece 310 by bonding or other methods with low stability. When the battery cell assembly in the shell structure needs to release pressure, the hot melt adhesive 320 is flushed out together with the flange 330, so that the first through hole 340 and the pressure relief hole 200 are communicated, so as to achieve the purpose of pressure relief.

[0059] It can be understood that in some embodiments, when it is necessary to increase the stability of the hot melt adhesive 320, the radial size of the flange 330 can be increased, so as to increase the area of the support surface.

[0060] Referring to Figure 6 and Figure 8In some embodiments, the aperture R2 of the second through hole 331 satisfies: 1.0 mm≤R2≤3.0 mm. The aperture R2 of the second through hole 331 is between 1.0 mm and 3.0 mm, for example, the aperture R2 of the second through hole 331 can be 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm. Further, the preferred range of R2 is 1.0≤R2≤1.8 mm, for example, the aperture R2 of the second through hole 331 can be 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm. The size diameter or area of the second through hole 331 is set to be smaller than or equal to the area of the pressure relief hole 200. With this design, the aperture in this range can ensure that the hot melt adhesive 320 is easy to break when heated, thereby quickly relieving pressure, and can also ensure that the hot melt adhesive 320 maintains good sealing performance under normal circumstances. It can be understood that a smaller aperture can increase the stability of the hot melt adhesive 320 and prevent leakage under abnormal circumstances; a larger aperture can reduce the breaking resistance of the hot melt adhesive 320 when heated, and speed up the pressure relief speed.

[0061] It can be understood that the specific value of the aperture R1 of the first through hole 340 is not limited, as long as the structural rigidity of the shell body 100 is ensured and the aperture R1 of the first through hole 340 is larger than the aperture R2 of the second through hole 331. The reasonable design of the aperture range of the second through hole 331 ensures the stability of the hot melt adhesive 320 and ensures that it can quickly respond when pressure relief is needed, thereby improving the safety of the battery. The aperture R2 of the second through hole 331 can be adjusted according to the actual use environment and needs of the battery. For example, in a high-temperature environment, a larger aperture can be selected to speed up the pressure relief speed; in a low-temperature environment, a smaller aperture can be selected to increase the stability of the hot melt adhesive 320.

[0062] Referring to Figure 6 and Figure 8 In some embodiments, the flange 330 surrounds the hole wall 341 of the first through hole 340 around the axis of the first through hole 340, and the flange 330 protrudes in the radial direction of the first through hole 340. The distance H1 from the surface of the flange 330 away from the shell body 100 to the surface of the connecting piece 310 away from the shell body 100 satisfies: 0.05 mm≤H1≤0.2 mm, for example, H1 can be 0.05, 0.07 mm, 0.09 mm, 0.11 mm, 0.13 mm, 0.15 mm, 0.17 mm, 0.19 mm, 0.2 mm. The design of the distance H1 is to ensure that the hot melt adhesive 320 can break quickly when heated, thereby achieving rapid pressure relief. If H1 is too small, the hot melt adhesive 320 may prematurely break under abnormal circumstances, resulting in sealing failure; if H1 is too large, the breaking resistance of the hot melt adhesive 320 when heated will increase, affecting the pressure relief speed. Therefore, the range of H1 is designed to be 0.05 mm to 0.2 mm, which can ensure the stability of the hot melt adhesive 320 and quickly break when needed.

[0063] Specifically, along the axis direction of the first through hole 340, the structure of the hot melt adhesive 320 is sequentially divided into the first adhesive section 321, the second adhesive section 322, and the third adhesive section 323 in the order of gradually moving away from the shell body 100, where H1 is the thickness of the first adhesive section 321. The pressure of the battery cell assembly needs to pass through the first adhesive section 321, the second adhesive section 322, and the third adhesive section 323 in sequence before being released, that is, before the pressure reaches the third adhesive section 323, the energy thereof will be reduced by the second adhesive section 322 and the first adhesive section 321, so that the third adhesive section 323 with a smaller thickness is beneficial to the response speed of pressure relief and can ensure that the pressure is released.

[0064] Of course, it can be understood that, in the process of the hot box test, heat needs to pass through the first adhesive section 321 and the second adhesive section 322 before reaching the third adhesive section 323, so in some embodiments, the third adhesive section 323 of the hot melt adhesive 320 can be configured as a material with a lower melting point to release the pressure.

[0065] It can be understood that different H1 values will affect the breaking characteristics and sealing performance of the hot melt adhesive 320. A smaller H1 value can reduce the breaking resistance of the hot melt adhesive 320 and accelerate the pressure relief speed; a larger H1 value can increase the stability of the hot melt adhesive 320 and prevent leakage in abnormal conditions. By selecting a suitable H1 value, the performance of the battery in different environments can be optimized.

[0066] According to the foregoing, it can be understood that the hot melt adhesive 320 used to fill the first through hole 340 can be the same material or a layered filling mode of different materials.

[0067] Referring to Figures 6 to 9 In some embodiments, along the axis direction of the first through hole 340, the surface of the connecting piece 310 on the side facing the shell body 100 and the surface of the hot melt adhesive 320 on the side facing the shell body 100 are located in the same plane. In this embodiment, the lower surfaces of the hot melt adhesive 320 and the connecting piece 310 are flush, and the upper surfaces are not limited. Specifically, referring to Figure 9 In some embodiments, the upper surface of the hot melt adhesive 320 is higher than the upper surface of the connecting piece 310, but the lower surface of the hot melt adhesive 320 remains flush with the lower surface of the connecting piece 310; referring to Figure 6 In some embodiments, the upper surface of the hot melt adhesive 320 is flush with the upper surface of the connecting piece 310, and the lower surface of the hot melt adhesive 320 is flush with the lower surface of the connecting piece 310. Such a design can ensure that the contact surface of the sealing piece 300 and the shell body 100 is more flat, reduces the air gap, and improves the sealing performance. In addition, this design is also helpful to uniformly distribute the pressure of the hot melt adhesive 320 and prevent the hot melt adhesive 320 from being broken prematurely due to excessive local pressure.

[0068] It can be understood that in some embodiments, the surfaces of the connecting piece 310 and the hot melt adhesive 320 can be ensured to be in the same plane by precision machining during the manufacturing process. In addition, in order to further improve the sealing performance, a thin layer of sealant can be coated on the surface of the connecting piece 310 and the hot melt adhesive 320 to fill the possible tiny gaps. By precision machining and coating sealant, the sealing performance of the sealing member 300 can be further improved, the air gap can be reduced, and the good sealing effect can be ensured under normal circumstances, while the pressure can be evenly distributed when pressure relief is needed, preventing the hot melt adhesive 320 from being broken prematurely due to excessive local pressure.

[0069] With reference to Figure 6 and Figure 8 Further, in some embodiments, along the axis direction of the first through hole 340, the thickness H2 of the connecting piece 310 and the thickness H3 of the hot melt adhesive 320 satisfy the relationship: H2≤H3. The thicknesses of the connecting piece 310 and the hot melt adhesive 320 are equal, which can ensure that the deformation amounts of the two are consistent when stressed, thereby reducing stress concentration. This design helps to improve the overall stability and sealing performance of the sealing member 300, and can evenly distribute the pressure when pressure relief is needed, preventing the hot melt adhesive 320 from being broken prematurely due to excessive local pressure, which in turn affects the sealing effect.

[0070] In some embodiments, the thicknesses of the connecting piece 310 and the hot melt adhesive 320 can be adjusted according to the actual use environment and requirements of the battery. For example, in a high-pressure environment, a larger thickness can be selected to increase the pressure resistance of the sealing member 300; in a low-pressure environment, a smaller thickness can be selected to reduce material usage and cost. By refining the thickness values of the connecting piece 310 and the hot melt adhesive 320, different use environments and requirements can be better adapted to, further improving the safety and reliability of the battery.

[0071] With reference to 1 to Figure 5 In some embodiments, the shell body 100 includes a bottom wall 110 and a side wall 120 surrounding the bottom wall 110, and the bottom wall 110 and the side wall 120 together define a containing chamber for containing the cell assembly, and the first through hole 340 is provided on the side wall 120. The containing chamber formed by the bottom wall 110 and the side wall 120 together provides a stable containing space for the cell assembly. The first through hole 340 is provided on the side wall 120, which can ensure that the hot melt adhesive 320 can be quickly broken when the internal pressure of the battery is too high, and the internal pressure is released from the side wall 120 through the pressure relief hole 200.

[0072] The pressure relief hole 200 is arranged on the side wall 120. Due to the small area and narrow width of the side wall 120 relative to the bottom wall 110, the rigidity of the side wall 120 is higher relative to the flat bottom wall 110. Under the action of the resealing element 300, the deformation of the side wall 120 is smaller, and it is safer.

[0073] It can be understood that in some embodiments, the side wall 120 can be designed in different shapes and thicknesses to adapt to different battery sizes and use environments. For example, the side wall 120 can be designed in a rectangular, circular, or other polygonal shape to adapt to different cell assemblies. The thickness of the side wall 120 can be adjusted according to the capacity of the battery and the use environment to ensure sufficient mechanical strength and sealing performance.

[0074] With reference to Figures 1 to 9 , the second aspect of the embodiments of the present application proposes a battery, which comprises the shell structure of any of the above embodiments and the pole 400. The battery shell body 100 comprises a bottom wall 110 and a side wall 120 surrounding the bottom wall 110, and the bottom wall 110 and the side wall 120 together define a containing chamber. The side wall 120 is provided with a third through hole 121, and the pole 400 is arranged in the third through hole 121. The pole 400 protrudes away from the side of the side wall 120 facing away from the containing chamber along the axis direction of the first through hole 340. The distance from the end of the connecting element 310 to the side wall 120 is less than or equal to the distance from the end of the pole 400 to the side wall 120.

[0075] The design of the pole 400 makes the electrical connection of the battery more convenient and reliable. The pole 400 is connected to the side wall 120 and protrudes away from the side of the side wall 120 facing away from the containing chamber along the axis direction of the first through hole 340, which ensures that the pole 400 can be in good contact with other electrical elements during installation of the battery. The distance from the end of the connecting element 310 to the side wall 120 is less than or equal to the distance from the end of the pole 400 to the side wall 120, which ensures that the sealing element 300 does not hinder the normal operation of the pole 400 during installation, avoids occupying the length dimension of the cell, and at the same time ensures the integrity of the sealing element 300.

[0076] It can be understood that in some embodiments, the shape and size of the pole 400 can be adjusted according to the specific application of the battery. For example, the pole 400 can be designed in a cylindrical, square, or other polygonal shape to adapt to different electrical connection requirements. The length of the pole 400 can also be adjusted according to the size of the battery and the use environment to ensure that it can be in good contact with other electrical elements during installation.

[0077] With reference to Figure 6 and Figure 8The distance from the end of the connecting piece 310 to the side wall 120 is configured as the thickness H2 of the connecting piece 310, and the thickness H2 of the connecting piece 310 satisfies: 0.2≤H2≤2.0mm. For example, H2 can be 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm. Preferably, H2 satisfies 0.2mm≤H2≤0.6mm, for example, H2 can be 0.2mm, 0.4mm, 0.6mm. Such design ensures that the thickness of the sealing piece 300 does not exceed the height of the existing pole 400, avoiding occupying the length dimension of the battery cell.

[0078] The battery includes a shell structure and a pole 400. The shell structure includes a shell body 100, a pressure relief hole 200, and a sealing piece 300. The shell body 100 includes a bottom wall 110 and a side wall 120, which together define a containing chamber for containing a battery cell assembly, and a first through hole 340 is provided in the side wall 120. The pole 400 is connected to the side wall 120, and the pole 400 protrudes away from the containing chamber on the side of the side wall 120 along the axis direction of the first through hole 340. The distance from the end of the connecting piece 310 to the side wall 120 is configured as the thickness H2 of the connecting piece 310, and the thickness H2 of the connecting piece 310 is between 0.2mm and 2mm.

[0079] The thickness H2 of the connecting piece 310 is designed to be between 0.2mm and 2mm, which can ensure the mechanical strength of the connecting piece 310 and prevent deformation during installation and use, and also ensure that the hot melt glue 320 can quickly break and release internal pressure when pressure relief is needed. The thickness H2 of the connecting piece 310 matches the distance from the end of the pole 400 to the side wall 120, ensuring that the normal work of the pole 400 is not hindered during installation, while ensuring the integrity of the sealing piece 300. A larger H2 value can increase the mechanical strength of the connecting piece 310 and prevent deformation during installation and use; a smaller H2 value can reduce the breaking resistance of the hot melt glue 320, speed up the pressure relief, and improve the safety of the battery.

[0080] Regarding the shell structure and battery provided in the present application, the sealing piece 300 is designed to be a composite structure, with a groove provided on a metal sheet and then filled with a glue body of PP material or the like in the groove through an injection molding process. Such a filled glue body will melt at a certain temperature, thereby meeting the pressure relief requirement, so that the shell structure and battery provided in the present application can meet the mechanical drop and hot box test requirements, and have simple structure, high production efficiency, and high safety.

[0081] The above are only preferred embodiments of the present application, and do not limit the patent range of the present application, and any equivalent structural transformation made by using the present application specification and drawing contents, or directly / indirectly applied in other related technical fields are included in the patent protection range of the present application.

Claims

1. A housing structure characterized by, include: The main body of the casing is used to house the battery cell assembly; A pressure relief vent is provided on the shell body; A sealing element includes a connector and hot melt adhesive. The connector has a first through hole, and the hot melt adhesive fills the first through hole. The sealing element is connected to the shell body, and the positions of the first through hole and the pressure relief hole correspond. Wherein, the wall of the first through hole protrudes to form a support surface, and the hot melt adhesive adheres to the support surface, and / or the wall of the first through hole is recessed to form the support surface, and the hot melt adhesive adheres to the support surface.

2. The housing structure of claim 1, wherein The seal includes a flange disposed on the wall of the first through hole and protruding radially along the first through hole, the surface wall of the flange being configured as the support surface.

3. The housing structure of claim 2, wherein, The flange surrounds the wall of the first through hole to form a second through hole, and the relationship between the diameter R1 of the first through hole and the diameter R2 of the second through hole satisfies: R2≤R1.

4. The housing structure of claim 3, wherein The diameter R2 of the second through hole satisfies: 1.0mm≤R2≤3.0mm.

5. The housing structure of claim 3, wherein The distance H1 from the surface of the flange away from the shell body to the surface of the connector away from the shell body satisfies: 0.05mm≤H1≤0.2mm.

6. The housing structure of claim 1, wherein Along the axial direction of the first through hole, the surface of the connector facing the shell body and the surface of the hot melt adhesive facing the shell body are both located in the same plane.

7. The housing structure of claim 1, wherein Along the axial direction of the first through hole, the thickness H2 of the connector and the thickness H3 of the hot melt adhesive satisfy the relationship: H2≤H3.

8. The housing structure of claim 1, wherein The shell body includes a bottom wall and a side wall surrounding the bottom wall, the bottom wall and the side wall together defining a receiving chamber for receiving the battery cell assembly, and the first through hole is provided in the side wall.

9. A battery, characterized by The battery includes the housing structure according to any one of claims 1-8, further comprising an electrode post, the housing body comprising a bottom wall and a side wall surrounding the bottom wall, the bottom wall and the side wall together defining a receiving chamber, the side wall having a third through hole, the electrode post passing through the third through hole, and the electrode post protruding along an axial direction parallel to the first through hole toward the side wall away from the receiving chamber, and along the axial direction of the first through hole, the distance from the end of the connector to the side wall is less than or equal to the distance from the end of the electrode post to the side wall.

10. The battery of claim 9, wherein, The distance from the end of the connector to the sidewall is configured as the thickness H2 of the connector, and the thickness H2 of the connector satisfies: 0.2≤H2≤2.0mm.

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