Housing structure and battery device

Abstract

The utility model relates to battery technology field, concretely relates to a shell structure and battery device, the shell structure includes: casing assembly, explosion -proof valve is set up on casing assembly, insulating part is set up in casing assembly, reinforcing ring is set up on insulating part, and the fixed part is set up on insulating part, and reinforcing ring sets up on fixed part, and reinforcing ring is located at the outer edge circumference of explosion -proof valve, and the melting point of reinforcing ring is greater than the melting point of insulating part. The embodiment sets up reinforcing ring at the outer edge of explosion -proof valve and the melting point meets the requirement, can directly resist heat runaway high temperature, avoids own softening to form exhaust passage, and the heat runaway exhaust is convenient.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a casing structure and a battery device. Background Technology

[0002] During battery thermal runaway, the temperature of the ejection from the explosion-proof valve is high, and the casing area near the valve is prone to softening due to the high temperature. Under the pressure of the gas inside the battery, the valve expands outward, making it prone to rupture. This leads to an expansion of the ejection area, causing the battery contents to erupt irregularly. The ejected material can affect adjacent batteries, triggering the spread of thermal runaway. Utility Model Content

[0003] In view of this, the present invention provides a shell structure and a battery device to solve the problem that the shell area near the explosion-proof valve port is prone to softening due to high temperature during battery thermal runaway, which can lead to the spread of thermal runaway.

[0004] In a first aspect, the present invention provides a shell structure, the shell structure comprising: Housing assembly; Explosion-proof valve, installed on the housing assembly; Insulating components are housed within the housing assembly; A reinforcing ring is provided on the insulating component, which has a fixing part. The reinforcing ring is located on the fixing part and is situated on the outer circumferential edge of the explosion-proof valve. The melting point of the reinforcing ring is greater than that of the insulating component.

[0005] Beneficial effects: In this embodiment, the reinforcing ring is placed on the outer edge of the explosion-proof valve and its melting point meets the requirements. It can directly resist the high temperature of thermal runaway and avoid softening itself, thereby preventing the flaring deformation of the housing assembly. At the same time, the insulating parts will melt during thermal runaway, while the reinforcing ring will not melt. Therefore, during thermal runaway, the reinforcing ring will be located between the battery cell and the explosion-proof valve, thus forming an exhaust channel to facilitate the exhaust of thermal runaway.

[0006] Secondly, the present invention also provides a battery device, which includes: a cell assembly and a housing structure as described in any of the above embodiments, wherein the cell assembly is disposed in the housing structure. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0008] Figure 1This is a schematic diagram of the overall structure of the battery device in an embodiment of this utility model; Figure 2 This is a schematic diagram of the cover plate in an embodiment of the present utility model; Figure 3 This is a cross-sectional view of the cover plate along its length in an embodiment of this utility model; Figure 4 for Figure 3 An enlarged diagram in Part A; Figure 5 for Figure 4 A diagram illustrating parameter annotations; Figure 6 A schematic diagram showing the projection of the reinforcing ring onto the explosion-proof valve to cover the solder mark.

[0009] Explanation of reference numerals in the attached figures: 1. Housing assembly; 11. Cover plate; 12. Mounting slot; 2. Explosion-proof valve; 21. Pressure relief port; 22. Explosion-proof disc; 23. Protective patch; 3. Insulating component; 31. Fixing part; 32. Protrusion; 321. Side wall; 322. Bottom wall; 323. Pressure relief hole; 4. Reinforcing ring; 5. Annular protrusion; 6. Weld stamp. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0011] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0012] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0013] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0014] During battery thermal runaway, the ejection temperature at port 2 of the explosion-proof valve is relatively high, and the casing area near port 2 is prone to softening due to the high temperature. Under the pressure of the gas inside the battery, the valve expands outward, making port 2 of the explosion-proof valve prone to damage. This leads to an expansion of the ejection area, irregular ejection of battery contents, and the ejected material can affect adjacent batteries, causing thermal runaway to spread.

[0015] In view of this, the present invention provides a housing structure and battery device to solve the problem that the housing area near the explosion-proof valve port 2 is prone to softening due to high temperature during battery thermal runaway, which can lead to the spread of thermal runaway.

[0016] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0017] According to an embodiment of the present invention, in one aspect, a housing structure is provided, which includes a housing assembly 1, an explosion-proof valve 2, a reinforcing ring 4, and an insulating component 3.

[0018] Specifically, in this embodiment, the housing assembly 1 can be made of a metal material, including but not limited to copper, iron, aluminum, stainless steel, and aluminum alloy. The housing assembly 1 forms a space suitable for accommodating the battery cell. The battery cell is the component in the battery where electrochemical reactions occur, and it is the smallest unit in the battery capable of electrochemical reactions such as charging / discharging. It typically includes a positive electrode, a negative electrode, and a separator. Lithium-ion battery cells mainly rely on the insertion and extraction of lithium ions between the positive and negative electrodes to operate. In a cylindrical battery cell, the thin film structure of three layers of material is wound into a cylindrical electrode assembly, while in a cuboid battery cell, the thin film structure is wound or stacked into an electrode assembly with a generally cuboid shape.

[0019] Furthermore, in this embodiment, the explosion-proof valve 2 is disposed on the housing assembly 1. The explosion-proof valve 2 is used to release pressure when the internal pressure of the battery reaches a certain level. The explosion-proof valve 2 can be disposed at the bottom, top, or side of the housing assembly 1. Of course, this embodiment is merely an example of the placement of the explosion-proof valve 2, and is not intended to limit it. Those skilled in the art can modify it according to actual conditions, as long as the same technical effect is achieved.

[0020] like Figure 1 and Figure 2 As shown, this embodiment illustrates the example of an explosion-proof valve 2 being mounted on a cover plate 11 of the housing assembly 1. The cover plate 11 can be located at the bottom of the housing assembly 1, the top of the housing assembly 1, or the side of the housing assembly 1.

[0021] Furthermore, in this embodiment, the insulating member 3 is disposed within the housing assembly 1, the reinforcing ring 4 is disposed on the insulating member 3, and the insulating member 3 is provided with a fixing part 31, with the reinforcing ring 4 disposed on the fixing part 31. In this embodiment, the reinforcing ring 4 can be disposed on the upper surface, the middle of the insulating member 3, or the lower surface of the insulating member 3. Of course, this embodiment is merely an example of the placement of the reinforcing ring 4, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0022] Furthermore, in this embodiment, the reinforcing ring 4 has a ring structure, such as a circular ring or a rectangular ring structure. Of course, the inner edge of the reinforcing ring 4 can abut against the outer edge of the explosion-proof sheet 22. Furthermore, the melting point of the reinforcing ring 4 is greater than the melting point of the insulating member 3.

[0023] Furthermore, in this embodiment, the insulating component 3 is made of one or more of the following materials: PP (Polypropylene), PET (Polyethylene terephthalate), PPS (Polyphenylene sulfide), and PI (Polyimide). The reinforcing ring 4 can be made of one or more of the following materials: phenolic resin, mica, stainless steel, titanium alloy, aluminum alloy, and nickel-based alloy. These materials have a tensile strength of 150MPa-500MPa at temperatures between 400℃ and 700℃, maintaining high structural strength even at high temperatures. They also have high melting points (above 500℃) and will not melt during thermal runaway, thus forming an venting space between the battery cell and the outer casing assembly. Of course, this embodiment is merely an example of the material of the reinforcing ring 4 and is not intended to limit its application. Those skilled in the art can modify it according to actual conditions to achieve the same technical effect.

[0024] The tensile strength test method is as follows: the test area is cut to obtain a sample with a width of 10mm and a length of 100mm; the tensile strength of the sample is tested by a tensile testing machine; finally, the fracture location is obtained and the tensile strength value is fed back.

[0025] Furthermore, in this embodiment, regarding the fixing method of the reinforcing ring 4, after the reinforcing ring 4 is fixed to the insulating component 3, the reinforcing ring 4 can also be further fixed to the housing assembly 1 by riveting, bonding, snapping, or screwing. Of course, this embodiment is merely an example of the fixing method of the reinforcing ring 4, but it is not a limitation. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0026] With this configuration, the reinforcing ring 4 is positioned on the outer edge of the explosion-proof valve 2 and has a melting point that meets the requirements. It can directly resist the high temperature of thermal runaway and avoid softening itself, thereby preventing the flaring deformation of the housing assembly 1. At the same time, the insulating component 3 will melt during thermal runaway, while the reinforcing ring 4 will not melt. Therefore, during thermal runaway, the reinforcing ring 4 will be located between the battery cell and the explosion-proof valve 2, thus forming an exhaust channel to facilitate the exhaust of thermal runaway.

[0027] Furthermore, in an optional embodiment, the thickness of the reinforcing ring 4 is L1mm, the thickness of the fixing part 31 is L2mm, and the ratio L1 / L2 is between 0.05 and 1.5. L1mm is between 0.1mm and 2mm, and L2mm is between 0.5mm and 2mm.

[0028] For example, L1mm can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. Of course, this embodiment is merely an example of a specific value for L1mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0029] For example, L2mm can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. Of course, this embodiment is merely an example of a specific value for L2mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0030] For example, the ratio L1 / L2 can be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, etc. Of course, this embodiment is merely an example illustrating the specific values ​​of the ratio L1 / L2, and is not intended to limit the scope. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0031] Furthermore, in an alternative embodiment, the fixing part 31 is formed by a downward recess of the insulating member 3 near the surface of the housing assembly 1, and the reinforcing ring 4 is disposed on the fixing part 31.

[0032] Specifically, in this embodiment, there are two ways to set the reinforcing ring 4. For example, the reinforcing ring 4 may protrude from the insulating member 3 or may not protrude from the insulating member 3. This setting will allow the reinforcing ring 4 to be clamped between the insulating member 3 and the housing assembly 1, thereby facilitating the fixation of the reinforcing ring 4 and preventing the reinforcing ring 4 from falling off during actual use, thus ensuring the overall stability of the housing structure.

[0033] Furthermore, in an optional embodiment, the fixing part 31 is disposed inside the insulating member 3, the distance between the upper surface of the reinforcing ring 4 and the upper surface of the insulating member 3 is L3mm, and the distance between the lower surface of the reinforcing ring 4 and the lower surface of the fixing part 31 is L4mm; and L3mm is greater than L4mm. L3mm is between 0.1mm and 1.5mm, and L4mm is between 0.1mm and 1.4mm.

[0034] For example, L3mm can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc. Of course, this embodiment is merely an example of a specific value for L3mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0035] For example, L4mm can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, etc. Of course, this embodiment is merely an example of a specific value for L4mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0036] With this configuration, in the event of thermal runaway, the insulating component 3 will melt under high temperature, thereby bringing the battery cell closer to the reinforcing ring 4. This facilitates the battery cell to quickly hold the reinforcing ring 4, preventing the reinforcing ring 4 from shifting. It also ensures that an exhaust space is formed between the battery cell and the explosion-proof sheet 22, allowing the entire battery to release pressure normally through the exhaust space.

[0037] Furthermore, in an optional embodiment, the explosion-proof valve 2 includes a pressure relief port 21 and an explosion-proof disc 22.

[0038] Specifically, in this embodiment, the pressure relief port 21 is located on the housing assembly 1. The pressure relief port 21 is used to release pressure after the internal pressure of the battery reaches a certain level, which then breaks through the explosion-proof sheet 22. The pressure relief port 21 can be located at the bottom, top, or side of the housing assembly 1. This embodiment is merely an example of the location of the pressure relief port 21, but it is not a limitation. Those skilled in the art can modify it according to the actual situation, as long as the same technical effect is achieved.

[0039] Furthermore, in this embodiment, the explosion-proof plate 22 is disposed on the housing assembly 1 and correspondingly disposed with respect to the pressure relief port 21, such that the explosion-proof plate 22 completely covers the pressure relief port 21. The explosion-proof plate 22 can be disposed inside the housing assembly 1 or outside the housing assembly 1. Of course, this embodiment is merely an example of the placement of the explosion-proof plate 22, but it is not intended to limit the application. Those skilled in the art can modify it according to actual conditions, as long as the same technical effect is achieved.

[0040] Furthermore, the explosion-proof plate 22 and the housing assembly 1 can be connected by welding. Of course, other connection methods such as riveting, bonding, and snap-fitting can also be used; this embodiment is merely illustrative. Furthermore, the material of the explosion-proof plate 22 is not limited, including but not limited to aluminum, steel, alloys, etc. Those skilled in the art can change the material of the explosion-proof plate 22 according to actual conditions, as long as the same technical effect is achieved.

[0041] Furthermore, the explosion-proof sheet 22 is provided with a weak area. Of course, the weak area can be a groove or a thinning area. This embodiment is merely an example to illustrate the specific type of weak area, but it is not a limitation. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0042] With this configuration, in this embodiment, by setting up an explosion-proof disc 22 and a pressure relief port 21, the internal explosion-proof disc 22 bursts under pressure and temperature during thermal runaway, and the pressure relief channel is opened through the pressure relief port 21.

[0043] Furthermore, in an optional embodiment, the housing assembly 1 further includes a mounting groove 12, which is disposed on the housing assembly 1 and located circumferentially on the outer edge of the pressure relief port 21. An explosion-proof plate 22 is disposed within the mounting groove 12. That is, the mounting groove 12 is provided around the inner periphery of the pressure relief port 21. The mounting groove 12 can be disposed either outside or inside the housing assembly 1. The explosion-proof plate 22 is disposed within the mounting groove 12, and is correspondingly disposed to the pressure relief port 21, so that the explosion-proof plate 22 completely covers the pressure relief port 21.

[0044] With this configuration, the mounting slot 12 in this embodiment can be specifically used to house the explosion-proof disc 22. The dimensions of the mounting slot 12 ensure that the explosion-proof disc 22, after being embedded, corresponds perfectly to the pressure relief port 21, preventing obstruction of the pressure relief channel due to positional misalignment. Simultaneously, the side wall 321 of the slot prevents lateral displacement of the explosion-proof disc 22 in the event of thermal runaway, enhancing its fixing strength. Furthermore, the mounting slot 12 provides a clearly defined operating area for welding, gluing, and other fixing methods of the explosion-proof disc 22, avoiding damage to other parts of the housing during the fixing process and simplifying the assembly process.

[0045] Furthermore, in an alternative embodiment, the explosion-proof sheet 22 is welded to the mounting groove 12 to form a weld mark 6.

[0046] With this configuration, the welding fixing method used in this embodiment can improve the connection strength between the explosion-proof sheet 22 and the mounting groove 12, ensuring that the explosion-proof sheet 22 bursts at the designed pressure and temperature in the event of thermal runaway, and avoiding premature detachment or seal failure. Since the connection structure formed by the weld mark 6 has a certain degree of high temperature resistance, it can slow down the softening rate of the connection part in the event of thermal runaway, thereby playing a certain role in safe pressure relief.

[0047] Furthermore, in an alternative implementation, such as Figure 6 As shown, along the vertical direction, the projection of the reinforcing ring 4 on the explosion-proof valve 2 covers the weld mark 6.

[0048] In this configuration, the solder mark 6, serving as a connection point, is prone to softening due to high temperatures during thermal runaway, leading to a decrease in connection strength. The reinforcing ring 4, covering this area, provides support for the solder mark 6 through its own structural strength, preventing breakage or deformation due to pressure impact. Simultaneously, the reinforcing ring 4 increases the shell thickness in this area, improving heat dissipation and slowing the softening rate of the solder mark 6. It also ensures more uniform stress distribution on the outer surface of the shell, reducing stress concentration and further enhancing structural stability during thermal runaway.

[0049] Furthermore, in an optional embodiment, the projection of the reinforcing ring 4 onto the explosion-proof valve 2 does not coincide with the weld mark 6 in the vertical direction, and the minimum distance between the inner edge of the reinforcing ring 4 and the weld mark 6 in the horizontal direction is L5mm, and L5mm is between 0.5mm and 3mm.

[0050] For example, L5mm can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, etc. Of course, this embodiment is merely an example of a specific value for L5mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0051] In this configuration, the weld mark 6 is the connection point between the explosion-proof sheet 22 and the shell. Its strength is lower than the surrounding area. By limiting the value range of L5mm, it can be ensured that the reinforcing ring 4 accurately covers the risk area around the weld mark 6 without interfering with the connection. Combined with the high melting point of the reinforcing ring 4, the high-temperature resistance of this weak point is further enhanced, reducing the risk of failure. If L5mm is too small, the reinforcing ring 4 may compress the weld mark 6, affecting the reliability of the connection; if L5mm is too large, the easily softened area around the weld mark 6 cannot be covered by the reinforcing ring 4, and it will still soften and flare during thermal runaway.

[0052] Furthermore, in an alternative embodiment, the explosion-proof valve 2 also includes an annular protrusion 5 and a protective patch 23.

[0053] Specifically, the annular protrusion 5 is disposed on the outside of the housing assembly 1 and located circumferentially around the edge of the pressure relief port 21, and the top surface of the annular protrusion 5 is connected to the protective patch 23. Furthermore, the material of the annular protrusion 5 may include, but is not limited to, one or more of the following materials: stainless steel, aluminum alloy, nickel-based alloy, and titanium alloy. Those skilled in the art can change the material of the annular protrusion 5 according to actual conditions, as long as the same technical effect is achieved.

[0054] Of course, the annular protrusion 5 and the housing assembly 1 can be integrally formed or separately formed. When the annular protrusion 5 and the housing assembly 1 are separately formed, they can be connected by welding, bonding, or riveting. This embodiment is merely an example illustrating the arrangement of the annular protrusion 5 and the housing assembly 1, and is not intended to limit the scope. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0055] Furthermore, in this embodiment, the protective patch 23 is disposed on the annular protrusion 5 and is disposed corresponding to the pressure relief port 21. The protective patch 23 can seal the pressure relief port 21, thereby ensuring that the interior of the housing assembly 1 is in a sealed state.

[0056] Similarly, the connection between the protective patch 23 and the annular protrusion 5 can be achieved by welding, or other connection methods such as riveting, bonding, or snap-fitting can be used. This embodiment is merely an example.

[0057] By incorporating the annular protrusion 5, this embodiment increases the thickness of the housing surrounding the pressure relief port 21, enhancing the structural strength of this area and preventing a decrease in housing strength due to the installation of the external protective patch 23. Simultaneously, the annular protrusion 5 provides a clear installation position for the protective patch 23, ensuring its alignment with the pressure relief port 21 and improving sealing performance under normal conditions. Furthermore, the annular protrusion 5, being higher than the housing surface, forms a physical barrier, preventing external objects from directly colliding with or rubbing against the protective patch 23, reducing its risk of damage and ensuring the long-term reliable operation of the explosion-proof valve 2.

[0058] In normal use, the protective patch 23 enhances the sealing performance of the pressure relief port 21, preventing leakage of internal battery materials. In the event of thermal runaway, the internal explosion-proof plate 22 bursts under pressure and temperature, opening the pressure relief channel through the pressure relief port 21. Therefore, the external protective patch 23 can help buffer the impact force of ejected materials or provide secondary pressure relief when necessary, preventing the failure of a single explosion-proof structure. This dual design ensures sealing requirements under normal conditions and guarantees reliable pressure relief in extreme scenarios.

[0059] Furthermore, in an optional embodiment, the distance between the inner edge of the reinforcing ring 4 and the inner wall of the pressure relief port 21 in the horizontal direction is L6mm, and L6mm is between 1mm and 4mm.

[0060] For example, L6mm can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, etc. Of course, this embodiment is merely an example of a specific value for L6mm, and does not limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0061] By limiting the value range of L6mm, this embodiment achieves a precise balance between pressure relief effect and protection range, ensuring that the reinforcing ring 4 fully covers the risk area without interfering with pressure relief. If L6mm is too small, the reinforcing ring 4 may block the pressure relief port 21, causing the pressure relief channel to narrow and affecting the discharge of gas and heat during thermal runaway. If L6mm is too large, the reinforcing ring 4 cannot cover the easily softened area on the outer edge of the explosion-proof valve 2, and flaring deformation may still occur during thermal runaway.

[0062] Furthermore, in an optional embodiment, the insulating member 3 further includes a protrusion 32 connected to the fixing part 31. The protrusion 32 extends away from the pressure relief port 21, forming a side wall 321 and a bottom wall 322, and pressure relief holes 323 are formed on the bottom wall 322 and the side wall 321, thereby allowing the protrusion 32 to form a grid structure that directly covers the inner side of the explosion-proof sheet 22. Furthermore, along the pressure relief direction of the pressure relief port 21, the projection of the protrusion 32 at least partially overlaps with that of the explosion-proof sheet 22.

[0063] In this configuration, the sidewalls 321 and bottom wall 322 of the protrusion 32 can enclose the internal area of ​​the reinforcing ring 4, working in conjunction with the clamping action of the fixing part 31 to further enhance the fixing stability of the reinforcing ring 4 and prevent displacement due to pressure impact during thermal runaway. Simultaneously, the sidewalls 321 and bottom wall 322 form a semi-enclosed guiding space, which can guide the ejected material to be discharged towards the preset pressure relief hole 323, preventing lateral diffusion of material from damaging adjacent batteries. Furthermore, the protrusion 32 coincides with the projection of the explosion-proof plate 22, providing additional support for the shell structure surrounding the explosion-proof plate 22, strengthening the area and ensuring that the explosion-proof plate 22 explodes normally at the designed position and pressure during thermal runaway. Further, the grid structure formed by the protrusion 32 can also prevent large, unburned pieces of material from being ejected from the pressure relief port 21 during pressure relief, avoiding lateral diffusion of large, unburned pieces of material from damaging adjacent batteries.

[0064] Furthermore, in an optional embodiment, the bottom wall 322 of the protrusion 32 and the explosion-proof sheet 22 are spaced apart along the pressure relief direction of the pressure relief port 21.

[0065] This configuration, where the bottom wall 322 of the protrusion 32 and the explosion-proof plate 22 are spaced apart, provides ample space for the gaseous and liquid substances generated during the pressure relief process, ensuring that these substances can enter this space normally and guaranteeing a smooth pressure relief channel. Simultaneously, the spaced area buffers the impact force of the ejected material, preventing direct impact on the bottom wall 322 and extending its service life, thus extending the lifespan of the insulating component 3. Furthermore, the buffering effect reduces the ejection velocity of the material, minimizing impact damage to surrounding components and improving the overall structural safety. If the bottom wall 322 were in close contact with the explosion-proof plate 22, it would obstruct the explosion of the plate, preventing it from opening due to insufficient pressure, resulting in poor pressure relief, and potentially even causing the entire casing to rupture due to the inability to release pressure in time.

[0066] Furthermore, in an optional embodiment, along the pressure relief direction of the pressure relief port 21, the distance between the bottom wall 322 of the protrusion 32 and the explosion-proof sheet 22 is L7mm, and L7mm is between 0.5mm and 5mm.

[0067] For example, L7mm can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2 .7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, etc. Of course, this embodiment is merely an example of the specific value of L7mm, but it is not intended to limit the scope of the invention. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0068] By limiting the value range of L7mm in this embodiment, the spacing distance can be ensured to meet the space requirements for the complete explosion of the explosion-proof disc 22, while also allowing the side walls 321 and bottom walls 322 to fully exert their guiding function and guide the material to be discharged towards the pressure relief hole 323. If L7mm is too small, it will still restrict the explosion deformation of the explosion-proof disc 22 and affect the pressure relief efficiency; if L7mm is too large, the side walls 321 and bottom walls 322 of the protrusion 32 will not be able to effectively guide the ejected material, resulting in an expansion of the material diffusion range and affecting adjacent components; at the same time, it will also occupy more space inside the housing assembly 1, affecting the space utilization rate of the battery device.

[0069] Furthermore, in an optional embodiment, the sidewall 321 is inclined toward the pressure relief port 21, so that the end of the sidewall 321 near the bottom wall 322 is close to the pressure relief port 21.

[0070] In this embodiment, the inclined design creates a converging guiding structure. During thermal runaway, the ejected material will naturally converge towards the pressure relief hole 323 on the bottom wall 322 under the guidance of the sidewall 321, preventing the material from spreading to both sides and causing an imbalance in the burst pressure. Simultaneously, the inclined structure distributes stress more evenly, and compared to the vertical sidewall 321, it can better resist the pressure impact of the ejected material, reducing the risk of breakage or deformation of the sidewall 321. Furthermore, the inclined sidewall 321 reduces the resistance to material flow, allowing gas and heat to escape more quickly through the pressure relief hole 323, improving pressure relief efficiency and further delaying the spread of thermal runaway.

[0071] Furthermore, in an optional embodiment, the connection between the sidewall 321 and the bottom wall 322 has a rounded structure.

[0072] With this design, the connection between the sidewall 321 and the bottom wall 322 in this embodiment is a rounded structure. Compared to right angles or sharp corners, a rounded structure can significantly reduce stress concentration under high temperature and pressure, preventing the connection from breaking due to pressure impact during thermal runaway. Therefore, the rounded structure can disperse stress, making the force on the protrusion 32 more uniform and improving its structural stability under extreme conditions. At the same time, the rounded surface has no sharp corners, which can reduce the retention of ejected material at the connection point, allowing for smoother material flow and improving pressure relief efficiency.

[0073] Furthermore, in an alternative embodiment, the fixing portion 31 is formed by a recess in the surface of the insulating member 3 away from the housing assembly 1.

[0074] With this design, after the insulating component 3 is recessed, the distance between the reinforcing ring 4 and the battery cell is closer. In the event of thermal runaway, the insulating component 3 will melt under high temperature, which will facilitate the battery cell to quickly hold the reinforcing ring 4, prevent the reinforcing ring 4 from shifting, and ensure that an exhaust space is formed between the battery cell and the explosion-proof sheet 22, so that the battery as a whole can release pressure normally through the exhaust space.

[0075] Secondly, the present invention also provides a battery device, which includes: a cell assembly and a housing structure as described in any of the above embodiments, wherein the cell assembly is disposed in the housing structure.

[0076] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A shell structure, characterized in that, include: Housing assembly (1); An explosion-proof valve (2) is disposed on the housing assembly (1); An insulating element (3) is disposed within the housing assembly (1); A reinforcing ring (4) is disposed on the insulating component (3), and a fixing part (31) is provided on the insulating component (3). The reinforcing ring (4) is disposed on the fixing part (31), and the reinforcing ring (4) is located on the outer circumferential side of the explosion-proof valve (2). The melting point of the reinforcing ring (4) is greater than the melting point of the insulating component (3).

2. The outer shell structure according to claim 1, characterized in that, In the vertical direction, the thickness of the reinforcing ring (4) is L1mm and the thickness of the fixing part (31) is L2mm, and the ratio L1 / L2 is between 0.05 and 1.

5.

3. The outer shell structure according to claim 1, characterized in that, The fixing part (31) is formed by a downward recess of the surface of the insulating member (3) near the housing assembly (1), and the reinforcing ring (4) is disposed on the fixing part (31).

4. The outer shell structure according to claim 1, characterized in that, The fixing part (31) is disposed inside the insulating member (3). The distance between the upper surface of the reinforcing ring (4) and the upper surface of the insulating member (3) is L3mm, and the distance between the lower surface of the reinforcing ring (4) and the lower surface of the insulating member is L4mm; and L3mm is greater than L4mm.

5. The outer shell structure according to any one of claims 2 to 4, characterized in that, The explosion-proof valve (2) includes: A pressure relief port (21) is provided on the housing assembly (1); An explosion-proof plate (22) is disposed on the housing assembly (1) and is disposed corresponding to the pressure relief port (21).

6. The outer shell structure according to claim 5, characterized in that, The housing assembly (1) further includes: The mounting groove (12) is formed on the housing assembly (1) and located on the outer circumferential side of the pressure relief port (21); the explosion-proof plate (22) is disposed in the mounting groove (12).

7. The outer shell structure according to claim 6, characterized in that, The explosion-proof sheet (22) is welded to the mounting groove (12) to form a weld mark (6).

8. The outer shell structure according to claim 7, characterized in that, In the vertical direction, the projection of the reinforcing ring (4) on the explosion-proof valve (2) covers the solder mark (6).

9. The outer shell structure according to claim 7, characterized in that, In the vertical direction, the projection of the reinforcing ring (4) on the explosion-proof valve (2) does not coincide with the weld mark (6), and in the horizontal direction, the minimum distance between the inner edge of the reinforcing ring (4) and the weld mark (6) is L5mm, and L5mm is between 0.5mm and 3mm.

10. The shell structure according to any one of claims 6 to 9, characterized in that, The explosion-proof valve (2) also includes: An annular protrusion (5) is provided on the outside of the housing assembly (1) and located circumferentially at the edge of the pressure relief port (21); A protective patch (23) is disposed on the annular protrusion (5) and is disposed corresponding to the pressure relief port (21).

11. The shell structure according to any one of claims 6 to 9, characterized in that, Along the horizontal direction, the distance between the inner edge of the reinforcing ring (4) and the inner wall of the pressure relief port (21) is L6mm, and L6mm is between 1mm and 4mm.

12. The shell structure according to any one of claims 6 to 9, characterized in that, The insulating element (3) further includes: A protrusion (32) is connected to the fixing part (31); the protrusion (32) extends away from the pressure relief port (21) to form a side wall (321) and a bottom wall (322); along the pressure relief direction of the pressure relief port (21), the projection of the protrusion (32) at least partially overlaps with that of the explosion-proof sheet (22); and pressure relief holes (323) are provided at least on the bottom wall (322) and / or the side wall (321).

13. The outer shell structure according to claim 12, characterized in that, Along the depressurization direction, the bottom wall (322) of the protrusion (32) is spaced apart from the explosion-proof sheet (22).

14. The outer shell structure according to claim 13, characterized in that, Along the depressurization direction, the distance between the bottom wall (322) of the protrusion (32) and the explosion-proof sheet (22) is L7mm, and L7mm is between 0.5mm and 5mm.

15. The shell structure according to claim 13 or 14, characterized in that, The side wall (321) is inclined toward the pressure relief port (21), so that the end of the side wall (321) near the bottom wall (322) is close to the pressure relief port (21).

16. The outer shell structure according to claim 15, characterized in that, The connection between the side wall (321) and the bottom wall (322) is a smooth structure.

17. The outer shell structure according to claim 1, characterized in that, The fixing part (31) is formed by a recess on the surface of the insulating member (3) away from the housing assembly (1).

18. A battery device, characterized in that, include: The battery cell assembly and the housing structure as described in any one of claims 1 to 17, wherein the battery cell assembly is disposed in the housing structure.

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