Blocking piece, tray, battery module and electric equipment

Abstract

The utility model discloses a blocking piece, a tray, a battery module and electric equipment. The blocking piece seals the exhaust hole of the tray body and is provided with a weak part and a connecting part, the thickness of the weak part is smaller than that of the connecting part, and the orthographic projection of the exhaust hole on the blocking piece coincides with at least part of the weak part. The blocking piece is additionally arranged on the exhaust hole of the tray, the weak part is reserved in the middle of the blocking piece, certain air pressure is achieved in the tray to break through the weak part, it can be effectively guaranteed that the interior of the tray is communicated with the exterior, and generated flames or smoke or gas is exhausted out of the tray. And during normal use, external foreign matters entering the tray can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a plug, a tray, a battery module and an electrical device. Background Art

[0002] When a battery pack experiences thermal runaway, it will release a large amount of high-temperature flammable gas. The existing design directly connects the tray to the outside through the exhaust hole. In normal use, when pressure relief is not required, the exhaust hole remains connected, and external debris enters the tray through the exhaust hole, puncturing and damaging the battery cell, causing the product to be scrapped. Utility Model Content

[0003] The purpose of this application is to provide a plug, a tray, a battery module and an electrical device to solve the problem of thermal runaway of the tray.

[0004] To achieve the purpose of this application, this application provides the following technical solutions:

[0005] In a first aspect, the utility model provides a plugging piece, which is suitable for use in a tray body and closes the exhaust hole of the tray body, including: the plugging piece has a weak portion and a connecting portion, the thickness of the weak portion is less than the thickness of the connecting portion, and the orthographic projection of the exhaust hole on the plugging piece coincides with at least part of the weak portion.

[0006] In one embodiment, the blocking piece is an integrated structure, and the connecting portion surrounds the outer periphery of the weak portion.

[0007] In one embodiment, the thickness D1 of the weak portion is 0.01 mm to 0.08 mm, and / or the thickness D2 of the connecting portion is 0.1 mm to 0.5 mm.

[0008] In one implementation, the thickness D1 of the weak portion and the thickness D2 of the connecting portion satisfy: 1≤D2:D1≤10.

[0009] In one embodiment, the weak portion includes a first weak portion and a second weak portion, and a thickness D1a of the first weak portion and a thickness D1b of the second weak portion satisfy: D1a>D1b.

[0010] In one embodiment, the thickness of the weak portion decreases along a direction from the first weak portion to the second weak portion.

[0011] In one embodiment, the second weak portion is a notch, and a thickness D3 of the notch is 0.01 mm to 0.05 mm.

[0012] In one implementation, the thickness D1 of the weak portion and the thickness D3 of the notch satisfy: 1≤D1:D3≤5.

[0013] In one embodiment, the tray includes a filter screen, the filter screen is connected to the blocking piece, and the orthographic projection of the filter screen on the blocking piece overlaps with at least a portion of the weak portion.

[0014] In one embodiment, a thinning groove is formed on one surface of the blocking piece, the bottom wall of the thinning groove is the weak portion, the filter is arranged at the opening of the thinning groove and connected to the inner peripheral wall of the thinning groove to cover the opening of the thinning groove.

[0015] In a second aspect, the utility model provides a pallet, comprising a pallet body and a plug as described in any one of the embodiments of the first aspect, wherein an exhaust hole is provided on the pallet body, and the plug is connected to the pallet body and closes the exhaust hole.

[0016] In a third aspect, the utility model provides a battery module, the battery module comprising the tray and battery cells, the battery cells being installed in the tray as described in the second aspect.

[0017] In a fourth aspect, the utility model provides an electrical device, comprising the battery module as described in the third aspect.

[0018] The utility model provides a plugging piece, which closes the exhaust hole of the tray body, and the exhaust hole can discharge the flame, smoke or gas generated by thermal runaway inside the tray out of the tray; in normal use, the plugging piece can effectively reduce the entry of external foreign matter into the tray; the plugging piece has a weak part and a connecting part, the thickness of the weak part is less than the thickness of the connecting part, and the positive projection of the exhaust hole on the plugging piece coincides with at least part of the weak part. When a certain air pressure is reached in the tray, the weak part can be broken, which can effectively ensure that the inside of the tray is connected with the outside, and discharge the generated flame, smoke or gas from the tray. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a structural diagram of a pallet;

[0021] Figure 2 yes Figure 1 The enlarged structural diagram at A;

[0022] Figure 3 is a structural diagram of an embodiment;

[0023] Figure 4 is a structural diagram of a weak part of an embodiment;

[0024] Figure 5 is a structural diagram of a weak portion of another embodiment;

[0025] Figure 6 This is a structural diagram of a weak portion of another embodiment;

[0026] Figure 7 It is a structural diagram of a weak part of one embodiment;

[0027] Figure 8 This is a structural diagram of a weak portion of another embodiment;

[0028] Fig. 9 is a structural diagram of another embodiment;

[0029] Fig.10 It is a structural diagram of yet another embodiment.

[0030] Description of reference numerals:

[0031] 1-tray, 2-exhaust hole, 3-blocking piece, 3A-connecting part, 3B-weak part, 3B1-first weak part, 3B2-second weak part, 4-notch, 5-filter screen, 6-thinning groove. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0035] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] The utility model provides a tray 1, comprising a tray 1 body and a plugging piece 3. The tray 1 body is provided with an exhaust hole 2; the plugging piece 3 is connected to the tray 1 body and closes the exhaust hole 2, and the plugging piece 3 has a weak portion 3B and a connecting portion 3A, the thickness of the weak portion 3B is less than the thickness of the connecting portion 3A, and the orthographic projection of the exhaust hole 2 on the plugging piece 3 coincides with at least part of the weak portion 3B.

[0037] Please refer to Figure 1-Figure 3The tray 1 includes a tray 1 body and a plug 3. The tray 1 body is provided with an exhaust hole 2. When the components inside the tray 1 fail or overheat, flames, smoke or gas are generated. If not released in time, other components inside the tray 1 will be damaged and a fire will be caused. The exhaust hole 2 can be provided to reduce the internal pressure, and the generated flames, smoke or gas are discharged through the exhaust hole 2, thereby reducing the damage to other components inside the tray 1 and reducing the risk of fire. Usually, heat is generated when the components inside the tray 1 are working normally, and excessive heat will cause the performance of the components inside the tray 1 to deteriorate and the life span to be shortened. The exhaust hole 2 can help release the heat inside the tray 1 and ensure that the components inside the tray 1 operate within a safe temperature range. The exhaust hole 2 can be arranged at the top of the tray 1. The top exhaust hole 2 can quickly release the flames, smoke or gas generated inside the tray 1. Since the flames, smoke or gas are usually light, placing the exhaust hole 2 at the top of the tray 1 helps the flames, smoke or gas to be released quickly, thereby improving the release efficiency. Providing the exhaust hole 2 at the top of the tray 1 can make it more convenient to install. For the vertically mounted tray 1, the arrangement of the top exhaust hole 2 is more in line with the direction of gravity, making it easier for flames, smoke or gas to rise and release. The exhaust hole 2 can be arranged on the side of the tray 1. When the space at the top of the exhaust hole 2 is limited, the flexibility of the tray 1 in different application scenarios is improved. In particular, when the space is limited, the exhaust hole 2 is arranged on the side of the tray 1 to more flexibly adapt to the horizontal installation requirements. The exhaust holes 2 are evenly arranged, and the evenly distributed exhaust holes 2 help ensure that the heat generated in the tray 1 can be evenly dissipated over the entire surface. This helps to prevent local overheating and maintain the overall temperature within a safe range. Ensure that flames, smoke or gas can be evenly released from various areas of the tray 1, avoid accumulation in certain areas, and reduce the uneven distribution of internal pressure. The method of opening the exhaust hole 2 on the main body of the tray 1 can be CNC machining, laser cutting, electric spark machining and chemical etching. The shape of the exhaust hole 2 can be circular, oval, or square. Optionally, the shape of the exhaust hole 2 is circular, which can reduce stress concentration, achieve uniform stress distribution, and improve the structural strength of the hole. And the circular hole is simple to manufacture, which can simplify the manufacturing process and reduce production costs. The circular exhaust holes 2 also help to achieve a more uniform gas release, thereby ensuring that the gas inside the tray 1 can be effectively and evenly discharged. When thermal runaway occurs in the tray 1, the generated flame, smoke or gas can be discharged through the exhaust holes 2 on the tray 1. This prevents the flame, smoke or gas from entering and gathering inside the tray 1, effectively preventing the flame, smoke or gas from causing damage to the components inside the tray 1. When thermal runaway does not occur and the inside of the tray 1 works normally, the plug 3 connects the main body of the tray 1 and closes the exhaust holes 2, which can block external foreign matter from entering the tray 1 and prevent external debris from entering the tray 1 and causing damage to the components inside the tray 1.The plugging piece 3 has a weak portion 3B and a connecting portion 3A. The function of the connecting portion 3A is to connect the plugging piece 3 to the pallet 1. The connection between the connecting portion 3A and the pallet 1 can be glued, welded, or connected by a tenon. When thermal runaway occurs, the thin weak portion 3B can be broken through, and the orthographic projection of the exhaust hole 2 on the plugging piece 3 overlaps with at least part of the weak portion 3B, forming an exhaust channel to discharge the flame, smoke or gas generated by the thermal runaway to the outside of the pallet 1. Reduce the damage caused by thermal runaway to the inside of the pallet 1.

[0038] In a specific embodiment, the tray 1 is installed on an electric vehicle. When the electric vehicle is running normally, the plugging piece 3 closes the exhaust hole 2 to isolate external debris and prevent the external debris from damaging the internal components of the tray 1. When thermal runaway occurs inside the tray 1 on the electric vehicle, the flame, smoke or gas generated inside the tray 1 breaks through the weak portion 3B on the plugging piece 3, and the flame, smoke or gas generated by the thermal runaway is discharged to the outside of the tray 1, thereby reducing damage to the entire electric vehicle.

[0039] In another specific embodiment, the tray 1 is installed on the energy storage power station. When the energy storage power station is used for normal charging and discharging, the plugging piece 3 closes the exhaust hole 2 to isolate external debris and prevent the external debris from damaging the internal components of the tray 1. When thermal runaway occurs inside the tray 1 on the energy storage power station, the flame, smoke or gas generated inside the tray 1 breaks through the weak portion 3B on the plugging piece 3, and the flame, smoke or gas generated by the thermal runaway is discharged to the outside of the tray 1, thereby reducing damage to the entire energy storage power station.

[0040] In one embodiment, the blocking piece 3 is an integrated structure, and the connecting portion 3A surrounds the outer periphery of the weak portion 3B.

[0041] In this embodiment, the integrated structure of the plugging piece 3 is that a relatively thin weak portion 3B is formed in the middle of the plugging piece 3, and the thick surrounding area of ​​the plugging piece 3 is the connecting portion 3A. The middle processing method of the plugging piece 3 can be CNC machining, laser cutting, electric spark machining and chemical etching. The connecting portion 3A surrounds the outer periphery of the weak portion 3B, please refer to Figure 3 , can achieve a more uniform strength distribution, can effectively disperse the load, reduce stress concentration, and improve the stability of the overall structure.

[0042] In a specific embodiment, the weak portion 3B is circular. The circular structure has a uniform geometric shape, which helps to evenly distribute stress. This can reduce stress concentration in the weak portion 3B domain and improve the durability and fatigue resistance of the structure. The circular shape is usually symmetrical, which helps to improve the stability of the overall structure. Symmetry helps to reduce deformation and uneven stress distribution caused by uneven loads or material properties. Circular structures are usually relatively easy to manufacture, and manufacturing processes such as processing and forming are simpler, which can reduce production costs.

[0043] In another specific embodiment, the weak portion 3B is an ellipse. The ellipse has directional strength, and the ellipse has different sizes in different directions. It can have higher strength in one direction and lower strength in another direction according to the design. Compared with a circle of equal size, the ellipse design can meet the size requirements of the weak portion in the long axis direction, and can reduce the use of materials in the short axis direction, thereby reducing the overall weight.

[0044] In another specific embodiment, the weak portion 3B is a square. The square structure has a uniform geometric shape, which helps to evenly distribute stress. This can reduce stress concentration in the weak portion 3B and improve the durability and fatigue resistance of the structure. The square structure is easier to manufacture, and the manufacturing processes such as processing, cutting and welding can be simpler, which can reduce production costs and improve production efficiency.

[0045] In one embodiment, the thickness D1 of the weak portion 3B is 0.01 mm to 0.08 mm, and / or the thickness D2 of the connecting portion 3A is 0.1 mm to 0.5 mm.

[0046] The thickness D1 of the weak portion 3B can be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm. When the thickness of the weak portion 3B is within the above range, when thermal runaway occurs inside the tray 1 and the pressure inside the tray 1 is greater than the safety pressure, the weak portion 3B can be broken through by the flame, smoke or gas generated inside the tray 1, thereby achieving the function of pressure relief. During normal use, it can isolate external foreign objects from entering the tray 1. When the thickness of the weak portion 3B is less than this range, the weak portion 3B cannot keep the external foreign objects from entering the tray 1 at ordinary times, and the weak portion 3B is easily broken by external foreign objects. When the thickness of the weak portion 3B is greater than this range, the thickness of the weak portion 3B is too large, and when thermal runaway occurs in the battery module and the pressure inside the tray 1 is greater than the safety pressure, the flame, smoke or gas generated inside the tray 1 cannot break through the weak portion 3B, and the purpose of pressure relief cannot be achieved.

[0047] The thickness D2 of the connection part 3A can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm. Meeting the above range of the thickness of the connection part 3A can ensure that the connection part 3A can maintain the structural integrity of the pallet 1 in both normal use and pressure relief burst situations. When the thickness of the connection part 3A is less than this range, the strength of the connection part 3A is insufficient to maintain the stability of the connection part 3A and the pallet 1. When the thickness of the connection part 3A is greater than this range, the thickness is redundant, increasing the cost and weight.

[0048] In one implementation, the thickness D1 of the weak portion 3B and the thickness D2 of the connecting portion 3A satisfy: 1≤D2:D1≤10.

[0049] The thickness D1 of the weak portion 3B and the thickness D2 of the connecting portion 3A, D2: D1 can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. Meeting the above range can ensure that the entire pallet 1 structure can maintain sufficient strength both during pressure relief and during normal use. In the case of thermal runaway, ensure that the weak portion 3B can be broken by the flame, smoke or gas generated inside the pallet 1, while maintaining the stability of the connecting portion 3A during normal use. The manufacturing process can be simplified and economical, while achieving the function, minimizing the cost and reducing the overall weight. Excessive weak portions 3B may increase manufacturing costs, while excessive thickness of the connecting portion 3A will increase weight and cost. When the ratio of the thickness D1 of the weak portion 3B to the thickness D2 of the connecting portion 3A is less than this range, the weak portion 3B is too thin to increase manufacturing costs and cannot maintain sufficient strength during normal use; when the ratio of the thickness D1 of the weak portion 3B to the thickness D2 of the connecting portion 3A is greater than this range, the thickness of the connecting portion 3A will increase weight and cost.

[0050] In one implementation, the weak portion 3B includes a first weak portion 3B1 and a second weak portion 3B2, and a thickness D1a of the first weak portion 3B1 and a thickness D1b of the second weak portion 3B2 satisfy: D1a>D1b.

[0051] Please refer to Figure 4 The weak portion 3B includes a first weak portion 3B1 and a second weak portion 3B2. The thickness D1a of the first weak portion 3B1 is greater than the thickness D1b of the second weak portion 3B2, so the second weak portion 3B2 is more easily broken. When there is thermal runaway, the flame, smoke or gas generated inside the tray 1 breaks through the second weak portion 3B, and a smaller exhaust channel can be formed in the second weak portion 3B2 in a directional manner, instead of breaking through the entire weak portion 3B, opening the entire weak portion 3B to form a large exhaust channel. This can prevent external foreign matter from entering the tray 1 and causing secondary damage. The first weak portion 3B1 and the second weak portion 3B2 can be manufactured by cutting, stamping, milling, or can be integrally formed by a mold.

[0052] In one embodiment, the thickness of the weak portion 3B decreases along the direction from the first weak portion 3B1 to the second weak portion 3B2.

[0053] For optional, possible implementations, please refer to Figure 4 , the thickness of the weak portion 3B gradually decreases from left to right.

[0054] For optional, possible implementations, please refer to Figure 5 , the thickness of the weak portion 3B gradually decreases from right to left.

[0055] For optional, possible implementations, please refer to Figure 6The thickness of the weak portion 3B gradually decreases from left to right, reaches the smallest thickness at the second weak portion 3B2, and then gradually increases.

[0056] For optional, possible implementations, please refer to Figure 7 The thickness of the weak portion 3B forms a second weak portion 3B2 on the far right, and the entire weak portion is composed of a first weak portion 3B1 and a second weak portion 3B2.

[0057] For optional, possible implementations, please refer to Figure 8 The thickness of the weak portion 3B forms a second weak portion 3B2 on the far left, and the entire weak portion is composed of a first weak portion 3B1 and a second weak portion 3B2.

[0058] In one implementation, the second weak portion 3B2 is a notch 4, and a thickness D3 of the notch 4 is 0.01 mm to 0.05 mm.

[0059] Please refer to Fig. 9 , a notch 4 is provided on the weak portion 3B. In case of thermal runaway, the flame, smoke or gas generated inside the tray 1 can break through the notch 4, drive the weak portion 3B to open, and form an exhaust channel. The advantage is that when the notch 4 on the weak portion 3B opens, the entire weak portion 3B will not fall off, and the falling weak portion 3B can be prevented from causing secondary damage. The method of providing the notch 4 on the weak portion 3B can be CNC machining, laser cutting, electric spark machining and chemical etching. The thickness D3 of the notch 4 can be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm. Meeting the above range of the thickness of the notch 4 can make it possible for the notch 4 to be broken when thermal runaway occurs inside the tray 1 and the pressure inside the tray 1 is greater than the safety pressure, and drive the weak portion 3B to be broken, thereby realizing the function of pressure relief. When the thickness of the notch 4 is less than this range, the notch 4 is easily broken by external foreign matter. When the thickness at the notch 4 is greater than this range, the thickness at the notch 4 is too large, the battery module undergoes thermal runaway, and when the pressure in the tray 1 is greater than the safety pressure, the pressure cannot break through the weak portion 3B, and the purpose of pressure relief cannot be achieved.

[0060] In one implementation, the thickness D1 of the weak portion 3B and the thickness D3 at the notch 4 satisfy: 1≤D1:D3≤5.

[0061] The thickness D1 of the weak portion 3B and the thickness D3 of the notch 4, D1:D3 can be 1, 2, 3, 4, 5. To meet the above range, on the one hand, the notch 4 is opened on the weak portion 3B, and the thickness D1 of the weak portion 3B should be greater than the thickness D3 of the notch 4. On the other hand, in the case of thermal runaway, it is ensured that the notch 4 can be broken through, and the flame, smoke or gas generated inside the tray 1 is discharged from the inside of the tray 1 through the notch 4. When the ratio of the thickness D1 of the weak portion 3B to the thickness D3 of the notch 4 is less than this range, the notch 4 is too thick, which will cause the flame, smoke or gas generated inside the tray 1 to break through the entire weak portion 3B; when the ratio of the thickness D1 of the weak portion 3B to the thickness D3 of the notch 4 is greater than this range, the notch 4 is too thin, and it is easy to be damaged during normal use, and cannot achieve the function of isolating external foreign matter during normal use.

[0062] In one embodiment, the tray 1 includes a filter screen 5 , the filter screen 5 is connected to the plugging piece 3 , and the orthographic projection of the filter screen 5 on the plugging piece 3 coincides with at least a portion of the weak portion 3B.

[0063] Please refer to Fig.10 , the filter 5 can be connected to the plug 3 by structural inlay, glue pasting and welding. When thermal runaway occurs in the tray 1, the flame, smoke or gas generated can break through the weak portion 3B, and the weak portion 3B falls off the connecting portion 3A. The filter 5 can prevent the weak portion 3B from falling into the interior of the tray 1 and causing secondary damage to the components inside the tray 1. The orthographic projection of the filter 5 on the plug 3 overlaps with at least part of the weak portion 3B, ensuring that the filter 5 can completely isolate the weak portion 3B and prevent the weak portion 3B from entering the interior of the tray 1 through the exhaust hole 2.

[0064] In one embodiment, a thinning groove 6 is formed on one surface of the blocking piece 3 , the bottom wall of the thinning groove 6 is a weak portion 3B, the filter screen 5 is arranged at the opening of the thinning groove 6 , and is connected to the inner peripheral wall of the thinning groove 6 to cover the opening of the thinning groove 6 .

[0065] The plug 3 is processed by CNC machining, laser cutting, EDM machining and chemical etching to form a thinning groove 6, please refer to Figure 5 The bottom wall of the thinning groove 6 is the weak portion 3B, and the filter screen 5 is arranged at the opening of the thinning groove 6, away from the direction of the weak portion 3B, and connected to the inner wall of the thinning groove 6, covering the opening of the thinning groove 6, so as to prevent the weak portion 3B from falling into the inside of the tray 1 and causing secondary damage to the components inside the tray 1 after the flame, smoke or gas generated by thermal runaway breaks through the weak portion 3B.

[0066] In one embodiment, the plugging piece 3 is made of metal, and the material of the plugging piece 3 includes any one of aluminum, magnesium and iron.

[0067] The advantage of using the plug 3 as metal is that metal usually has high strength and durability and can withstand a certain amount of pressure. This allows the plug 3 to block external foreign matter from entering the tray 1 when closing the exhaust hole 2, preventing external debris from entering the tray 1 and damaging the components in the tray 1. Metal has good plasticity and can be processed into various shapes. This allows the metal plug 3 to be customized in size and shape according to specific needs. Metal materials are easy to process and manufacture, and can be processed into different shapes through stamping, casting, and welding to meet different design requirements.

[0068] In a specific embodiment, the material of the plugging piece 3 is aluminum. Aluminum is conducive to lightweight, and the density of aluminum is relatively low, so that the plugging piece 3 made of aluminum has a smaller mass and can reduce the overall weight. Aluminum has good corrosion resistance and can form a thin and strong aluminum oxide layer to prevent further oxidation and corrosion of the plugging piece 3. This makes the plugging piece 3 more durable in a humid or corrosive environment. Aluminum is easy to process and shape, and it is easier to process and produce plugging pieces 3 with complex shapes.

[0069] In another specific embodiment, the material of the plugging piece 3 is magnesium. Magnesium is also conducive to lightweight, and the density of magnesium is relatively lower. The plugging piece 3 made of magnesium is very beneficial in reducing weight. Magnesium has a good strength-to-weight ratio and can meet working conditions with high strength requirements. Magnesium has good plasticity and is easy to process and form. This makes it possible to produce plugging pieces 3 of various shapes to meet different design requirements.

[0070] In another specific embodiment, the material of the plugging piece 3 is iron. Iron is easy to process and shape, can be suitable for mass production, and can meet the design requirements of plugging pieces 3 of various complex shapes. Iron is a relatively cheap metal, which makes it more economical to use iron to manufacture plugging pieces 3. Iron has high strength and is suitable for working conditions with high material strength requirements. The plugging piece 3 made of iron has superior performance when it needs to support weight or is subjected to large forces.

[0071] In one embodiment, the weak portion 3B and the connecting portion 3A are made of different materials.

[0072] The weak part 3B and the connecting part 3A are made of different materials. The weak part 3B and the connecting part 3A can be manufactured separately and then assembled together. The combination of the weak part 3B and the connecting part 3A can be welded and glued. The weak part 3B and the connecting part 3A are made of different materials. By selecting appropriate materials, the required toughness and strength can be achieved in the weak part 3B, and the appropriate material can be selected in the connecting part 3A to achieve better connection performance. In terms of manufacturing, it is more economical to manufacture parts of different materials to optimize the overall cost.

[0073] In a specific embodiment, the weak portion 3B is aluminum and the connecting portion 3A is iron. The weak portion 3B is made of aluminum to reduce the overall weight and ensure that flames, smoke or gas can break through the weak portion 3B in the event of thermal runaway; while the connecting portion 3A is made of stronger iron to ensure better connection performance and reduce costs.

[0074] In another specific embodiment, the weak portion 3B is magnesium and the connecting portion 3A is iron. The weak portion 3B is made of magnesium to reduce the overall weight and ensure that flames, smoke or gas can break through the weak portion 3B in the event of thermal runaway; while the connecting portion 3A is made of stronger iron to ensure better connection performance and reduce costs.

[0075] In one embodiment, the utility model provides a pallet 1, which includes a pallet 1 body and a plugging piece 3 of any one of the above embodiments, wherein the pallet 1 body is provided with an exhaust hole 2, and the plugging piece 3 is connected to the pallet 1 body and closes the exhaust hole 2.

[0076] In one embodiment, the utility model provides a battery module, the battery module includes a tray 1 and battery cells, and the battery cells are installed in the tray 1 including the above embodiment.

[0077] In one embodiment, the utility model provides an electric device, including the above-mentioned battery module. The electric device can be a new energy vehicle and an energy storage power station.

[0078] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0079] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A plugging piece, suitable for use in a tray body and closing the exhaust hole of the tray body, characterized in that: include: The plugging piece has a weak portion and a connecting portion, the thickness of the weak portion is smaller than the thickness of the connecting portion, and the orthographic projection of the exhaust hole on the plugging piece overlaps with at least a portion of the weak portion.

2. The plugging piece according to claim 1, characterized in that: The blocking piece is an integrated structure, and the connecting portion surrounds the outer periphery of the weak portion.

3. The plugging piece according to claim 1, characterized in that: The thickness D1 of the weak portion is 0.01 mm to 0.08 mm, and / or the thickness D2 of the connecting portion is 0.1 mm to 0.5 mm.

4. The plugging piece according to claim 1, characterized in that: The thickness D1 of the weak portion and the thickness D2 of the connecting portion satisfy: 1≤D2:D1≤10.

5. The plugging piece according to claim 1, characterized in that: The weak portion includes a first weak portion and a second weak portion, and a thickness D1a of the first weak portion and a thickness D1b of the second weak portion satisfy: D1a>D1b.

6. The plugging piece according to claim 5, characterized in that: The thickness of the weakened portion decreases in a direction from the first weakened portion to the second weakened portion.

7. The plugging piece according to claim 5, characterized in that: The second weak portion is a notch, and a thickness D3 of the notch is 0.01 mm to 0.05 mm.

8. The plugging piece according to claim 7, characterized in that: The thickness D1 of the weak portion and the thickness D3 of the notch satisfy: 1≤D1:D3≤5.

9. The plugging piece according to claim 1, characterized in that: The tray includes a filter screen connected to the blocking piece, and an orthographic projection of the filter screen on the blocking piece overlaps with at least a portion of the weak portion.

10. The plugging piece according to claim 9, characterized in that: A thinning groove is formed on one surface of the blocking piece, the bottom wall of the thinning groove is the weak portion, the filter is arranged at the opening of the thinning groove and is connected to the inner peripheral wall of the thinning groove to cover the opening of the thinning groove.

11. A pallet, characterized in that: The tray comprises a tray body and a plugging piece as claimed in any one of claims 1 to 10, wherein the tray body is provided with an exhaust hole, and the plugging piece is connected to the tray body and closes the exhaust hole.

12. A battery module, characterized in that: The battery module comprises the tray as claimed in claim 11 and a battery cell, wherein the battery cell is installed in the tray.

13. An electrical equipment, characterized in that: Comprising the battery module as claimed in claim 12.

Images