Battery pack and electric device

Abstract

The application belongs to the field of batteries, and specifically provides a battery pack and an electric device. The battery pack comprises a battery group, a heat exchange plate and a pack body. The battery group comprises a plurality of single batteries arranged in an array. A relief valve is arranged on the bottom surface of the single battery. The heat exchange plate is arranged at the bottom of the battery group and is configured to exchange heat with the single battery. The heat exchange plate is provided with a through hole corresponding to the position of the relief valve. The pack body is provided with a bottom guard plate. An exhaust space is formed between the bottom guard plate and the heat exchange plate. The pack body is provided with a total exhaust port. The gas sprayed from the relief valve is configured to be discharged through the total exhaust port. The bottom guard plate is provided with a reinforcing plate corresponding to the position of the relief valve. The projection of the relief valve on the bottom guard plate is located in the projection of the reinforcing plate on the bottom guard plate. The reinforcing plate is used to buffer the high-temperature and high-pressure fluid to avoid the deformation or even melting of the bottom guard plate of the pack body caused by the impact of the fluid sprayed from the relief valve, thereby avoiding the occurrence of the situation that the bottom guard plate of the pack body is broken.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a battery pack and an electrical device. Background Technology

[0002] During use, batteries may experience thermal runaway due to overcharging, short circuits, or high-temperature environments. When a battery experiences thermal runaway, it generates a large amount of high-temperature, high-pressure gas. The accumulation of this gas inside the battery can lead to risks such as explosion. Therefore, battery casings are often equipped with pressure relief valves. When the internal pressure of the battery reaches the valve's pressure relief capacity, the valve promptly connects to the outside environment and releases pressure.

[0003] To prevent the high-temperature, high-pressure gas ejected from the pressure relief valve from directly impacting electrical components and causing problems such as short circuits and insulation failure, batteries with pressure relief valves located at the bottom have been developed. Because the pressure relief valve is located at the bottom, the ejected fluids can be discharged downwards, avoiding direct contact with electrical components, thus achieving thermoelectric separation and improving the overall safety of the battery pack.

[0004] However, in existing battery packs, if a single cell experiences thermal runaway and the pressure relief valve ruptures, the fluid ejected from the valve will have a relatively high temperature and pressure. The fluid ejected from the valve will directly impact the bottom protective plate of the pack, causing the bottom protective plate to deform or even melt due to the impact of the fluid ejected from the valve. This could lead to dangerous situations such as short circuits within the battery pack, affecting operational safety. Utility Model Content

[0005] In view of this, the present application aims to provide a battery pack and electrical equipment to solve the technical problem that when a single cell in an existing battery pack ruptures due to thermal runaway, the fluid ejected from the pressure relief valve has a relatively high temperature and pressure. The fluid ejected from the pressure relief valve directly sprays onto the bottom protective plate of the pack, causing the bottom protective plate of the pack to deform or even melt due to the impact of the fluid ejected from the pressure relief valve. This can lead to dangerous situations such as short circuits inside the battery pack, affecting operational safety.

[0006] The first aspect of this application provides a battery pack, comprising: A battery pack, comprising multiple individual cells arranged in an array, wherein a pressure relief valve is provided on the bottom surface of each individual cell; A heat exchange plate is disposed at the bottom of the battery pack and is configured to exchange heat with individual cells. The heat exchange plate is provided with a through-hole corresponding to the position of the pressure relief valve. The package body is provided with a bottom protective plate, and an exhaust space is formed between the bottom protective plate and the heat exchange plate. The package body is provided with a total exhaust port, and the gas ejected from the pressure relief valve is configured to be discharged through the total exhaust port. The bottom protective plate is provided with reinforcing plates corresponding to the positions of the pressure relief valves, and the projection of the pressure relief valve on the bottom protective plate is located within the projection of the reinforcing plates on the bottom protective plate.

[0007] Another aspect of this application provides an electrical device including the aforementioned battery pack.

[0008] In the battery pack of this application embodiment, since a reinforcing plate is provided on the bottom cover plate corresponding to the position of the pressure relief valve, the projection of the pressure relief valve on the bottom cover plate is located within the projection of the reinforcing plate on the bottom cover plate. When the ejected fluid or other fluid sprayed downwards from the pressure relief valve of any single cell ruptures, the reinforcing plate can buffer the high-temperature and high-pressure fluid. The fluid sprayed from the pressure relief valve will not spray directly onto the bottom cover plate of the pack, avoiding deformation or even melting of the bottom cover plate due to the impact of the fluid sprayed from the pressure relief valve, which could lead to a break in the bottom cover plate of the pack. This prevents the fluid sprayed from the pressure relief valve from breaking through the bottom cover plate of the pack, which could cause short circuits in the battery pack and its associated electrical equipment, effectively improving the working safety of the battery pack and its associated electrical equipment. Attached Figure Description

[0009] It should be understood that the following figures only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0010] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0011] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0012] Figure 1 This is a perspective view of the battery pack according to an embodiment of this application.

[0013] Figure 2 This is a cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0014] Figure 3 This is another cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0015] Figure 4 This is another perspective view of the battery pack according to an embodiment of this application.

[0016] Figure 5 This is a schematic diagram of the bottom surface of the battery pack according to an embodiment of this application.

[0017] Attached image labels: 10. Package body; 11. Bottom panel; 12. Frame; 13. Main vent; 20. Battery pack; 2. Individual cell; 21. Casing; 22. Cover plate; 23. Pressure relief valve; 29. Battery line; 30. Heat exchange plate; 31. Flow guide; 311. Main baffle; 312. Side baffle; 313. Reinforcing plate; 314. Air outlet; 315. Adhesive layer; 32. Flow channel; 40. Exhaust space.

[0018] X - First direction; Y - Second direction; Z - Height direction. Detailed Implementation

[0019] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] like Figures 1 to 5 As shown, this application embodiment provides a battery pack, including a pack body 10, a battery pack 20, and a heat exchange plate 30. The pack body 10 includes a bottom protective plate 11 and a frame 12 fixed to the outer periphery of the bottom protective plate 11. The bottom protective plate 11 and the frame 12 form a receiving cavity. The receiving cavity is used to accommodate various structures required for the battery pack.

[0022] The battery pack of this embodiment comprises a battery pack 20, a battery management system, a thermal management system, an electrical connection system, structural components, and protective components, all housed within a pack body 10 and sealed by a cover plate 22, forming a complete functional unit capable of directly outputting electrical energy. The battery pack 20 is formed by multiple individual batteries 2 connected in series and / or parallel. The electrical connection system includes high-voltage connectors, low-voltage connectors, and wiring harnesses. The structural components include a housing and a support frame. This battery pack, as a rechargeable battery, can serve as a power source for new energy vehicles. The battery pack of this embodiment may also include a separator plate, with both the individual battery 2 and the separator plate located within the pack body 10. The separator plate is located on the side of the individual battery 2 furthest from the bottom protective plate 11 of the pack body 10, separating the individual battery 2 from other components located above it, thus providing isolation.

[0023] Specifically, the aforementioned housing 10 can be a closed or semi-closed structure made of materials such as metal or plastic. It serves as the physical carrier of the battery pack 20, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The housing 10 provides installation space for the battery pack 20, BMS, cooling system, electrical connection components, etc., and through reasonable structural design, fixes these components within the housing 10 to ensure that they maintain a relatively stable position during battery pack operation, avoiding damage to components or loosening of connections due to vibration, impact, or other factors.

[0024] The package 10 may include a lower package and an upper package. The lower package includes a bottom protective plate 11 and a frame 12 connected to and surrounding the bottom protective plate 11. The upper package is connected to the frame 12 and has a cover plate 22 opposite to the bottom protective plate 11. The upper and lower packages together form a receiving cavity. The frame 12 and the bottom protective plate 11 can be integrally formed or processed separately and then fixedly connected. Specifically, the frame 12 and the bottom protective plate 11 are fixedly connected by welding, riveting, screwing, etc. When the package 10 is a cube, the frame 12 of the lower package generally has four side plates, which surround the periphery of the bottom protective plate 11. In other embodiments, the shape of the package 10 may also be a cylinder or other shapes. The frame 12 mainly serves to support, protect, and connect. The frame 12 may be formed by splicing multiple beams together. The frame 12 may be rectangular, circular, polygonal, etc., without limitation. The beams of the frame 12 may have a solid structure or contain cavities. The bottom protective plate 11 is the main load-bearing component of the battery pack, used to support and fix the battery pack 20, battery management system, cooling system and other components inside the battery pack. The pack body 10 can be cast from materials such as steel and aluminum alloy, or lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials.

[0025] like Figure 2 As shown, the battery pack 20 is disposed in the receiving cavity. The battery pack 20 includes a plurality of individual cells 2 arranged in a row. A pressure relief valve 23 is disposed on the bottom surface of the individual cells 2.

[0026] Understandably, multiple individual battery cells 2 with similar capacity and internal resistance are connected in series or parallel to form a battery pack 20. Each individual battery cell 2 can store chemical energy and controllably convert it into electrical energy. In a recyclable battery, the active materials can be reactivated by charging after discharge for continued use. Each individual battery cell 2 includes at least a casing 21 and a cover plate 22 fixedly connected to each other, as well as a battery cell and electrolyte. The casing 21 and cover plate 22 together house the battery cell and electrolyte. The cover plate 22 may have at least one positive terminal and at least one negative terminal for electrical connection to the outside. When the casing 21 and cover plate 22 are welded together, the connection can be a weld seam left during welding; when the casing 21 and cover plate 22 are fixedly connected in other ways such as bonding or riveting, the connection can be a different structure. Understandably, compared to other locations on the side of the individual battery cell 2, the connection is generally more fragile and has lower structural strength. The battery cell includes one or more electrode assemblies. Each electrode assembly is formed by stacking or winding a positive electrode, a negative electrode, and a separator. The separator is located between adjacent positive and negative electrode sheets to insulate them. At least one end of each electrode assembly has a tab. One end of an adapter piece is electrically connected to the tab, and the other end is electrically connected to a terminal post. It is understood that the single-cell battery 2 in this embodiment can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and is not limited thereto.

[0027] The pressure relief valve 23 is a component or part that can be actuated to release internal pressure or temperature when the internal pressure or temperature of a single cell 2 reaches a predetermined threshold. During battery use, the pressure relief valve 23 is mainly used to allow gas to escape from the battery and reduce internal pressure in cases of thermal runaway, preventing excessive pressure buildup that could cause deformation or explosion. The material of the pressure relief valve 23 is not limited, including but not limited to aluminum, steel, and alloys. The shape of the pressure relief valve 23 is not limited, such as square, oblong, elliptical, racetrack-shaped, etc. The type of pressure relief valve 23 is not limited, such as a notched pressure relief valve 23, which can be formed by stamping or laser etching.

[0028] Since a pressure relief valve 23 is provided on the bottom surface of the single cell 2, when the internal pressure of the battery reaches the pressure relief intensity of the pressure relief valve 23, the pressure relief valve 23 will connect with the outside and release pressure in time; the ejected fluids such as the ejected material from the pressure relief valve 23 will be discharged downwards to avoid direct contact with the electrical components above the single cell 2, so as to achieve thermal and electrical separation and improve the overall safety of the battery pack.

[0029] The heat exchange plate 30 is disposed at the bottom of the battery pack 20 and is configured to exchange heat with the individual battery cell 2; specifically, the heat exchange plate 30 is attached to the bottom surface of the individual battery cell 2 and can heat and / or cool the individual battery cell 2 as needed.

[0030] The heat exchange plate 30 is a component for regulating the temperature of the individual battery cell 2. The heat exchange plate 30 has an internal heat exchange channel for the flow of a heat exchange medium. This medium can be a gas such as air, a liquid such as water, alcohol, refrigerant, or oil, or a solid such as thermally conductive adhesive or solder paste. The heat exchange channel has an inlet and an outlet for the heat exchange medium. The medium enters the channel through the inlet, exchanges heat with the individual battery cell 2, and then exits through the outlet, thus achieving heat exchange for the individual battery cell 2. The heat exchange plate 30 can be made of a material with high thermal conductivity, such as copper; alternatively, it can have a heat pipe inside, which can rapidly transfer heat through the principle of thermal convection; or it can have a channel inside, connecting to a heating or cooling device, through which a liquid medium flows, enabling efficient heat exchange. The heat exchange plate 30 may include a heating element and an electrical connector. The heating element can be a heating wire, a heating film, or a heating plate; this application does not impose any limitations. The heat exchange plate 30 can be made of metal materials, such as aluminum alloy or magnesium alloy; or it can be made of plastic.

[0031] like Figure 2 and Figure 3 As shown, the heat exchange plate 30 is provided with a through-hole corresponding to the position of the pressure relief valve 23. The bottom protective plate 11 of the package 10 and the heat exchange plate 30 form an exhaust space 40, and the package 10 is provided with a total exhaust port 13. In this way, since the heat exchange plate 30 is provided with a through-hole corresponding to the position of the pressure relief valve 23, the ejected fluid such as the ejected material from the pressure relief valve 23 can be discharged downward through the through-hole to the exhaust space 40 between the bottom protective plate 11 and the heat exchange plate 30 of the package 10, and then discharged from the total exhaust port 13 on the package 10 to the outside of the battery pack.

[0032] Among them, the bottom guard plate 11 is provided with a reinforcing plate 313 at the position corresponding to the pressure relief valve 23, and the projection of the pressure relief valve 23 on the bottom guard plate 11 is located within the projection of the reinforcing plate 313 on the bottom guard plate 11. In the battery pack of this application embodiment, since a reinforcing plate 313 is provided on the bottom protective plate 11, the projection of the pressure relief valve 23 on the bottom protective plate 11 is located within the projection of the reinforcing plate 313 on the bottom protective plate 11. When the ejected fluid or other fluid sprayed out from the pressure relief valve 23 of any single cell 2 after it ruptures, the reinforcing plate 313 can buffer the high-temperature and high-pressure fluid. The fluid sprayed out by the pressure relief valve 23 will not spray directly onto the bottom protective plate 11 of the pack body 10, thus avoiding deformation or even melting of the bottom protective plate 11 of the pack body 10 due to the impact of the fluid sprayed out by the pressure relief valve 23, which could lead to a break in the bottom protective plate 11 of the pack body 10. This also prevents the fluid sprayed out by the pressure relief valve 23 from breaking through the bottom protective plate 11 of the pack body 10, which could cause short circuits in the battery pack and its associated electrical equipment, effectively improving the working safety of the battery pack and its associated electrical equipment.

[0033] like Figure 5 As shown, multiple reinforcing plates 313 are provided, and the reinforcing plates 313 protrude from the upper surface of the bottom protective plate 11; a reinforcing plate 313 is respectively provided on the bottom protective plate 11 at the position corresponding to the pressure relief valve 23. That is, in the battery pack of this application embodiment, a reinforcing plate 313 can be provided on the upper surface of the bottom protective plate 11 at the position corresponding to the pressure relief valve 23. Each reinforcing plate 313 can cover the corresponding position of the pressure relief valve 23. When the ejected fluid such as the ejected material is ejected downward after the pressure relief valve 23 of any single cell 2 ruptures, the corresponding reinforcing plate 313 below can be used to buffer the high temperature and high pressure fluid. In addition, it can also effectively save the required material of the reinforcing plate 313 and reduce the overall material cost of the reinforcing plate 313.

[0034] like Figure 5 As shown, in one embodiment of this application, the projected area of ​​the pressure relief valve 23 on the bottom protective plate 11 is s mm. 2 The projected area of ​​the reinforcing plate 313 on the bottom protective plate 11 is t mm. 2 s / t satisfies 0.5≤s / t≤0.9.

[0035] The projected area of ​​the pressure relief valve 23 on the bottom protective plate 11 is s mm. 2 The projected area t mm of the reinforcing plate 313 on the bottom guard plate 11 2 When the ratio s / t is less than 0.5, the overall area of ​​the reinforcing plate 313 is large, increasing the material cost required for the reinforcing plate 313. The projected area s mm of the pressure relief valve 23 on the bottom protective plate 11 is... 2 The projected area t mm of the reinforcing plate 313 on the bottom guard plate 11 2When the ratio s / t is greater than 0.9, some of the fluid ejected from the pressure relief valve 23 is likely to be ejected into the area outside the reinforcing plate 313 on the bottom guard plate 11, causing some areas of the bottom guard plate 11 to be impacted by the fluid ejected from the pressure relief valve 23, resulting in deformation and other situations.

[0036] Therefore, the projected area s mm of the pressure relief valve 23 on the bottom guard plate 11 2 The projected area t mm of the reinforcing plate 313 on the bottom guard plate 11 2 When the ratio s / t satisfies 0.5≤s / t≤0.9, it ensures that a portion of the fluid ejected from the pressure relief valve 23 is ejected into the area within the reinforcing plate 313 on the bottom protective plate 11, thus preventing the bottom protective plate 11 area from being impacted by the fluid ejected from the pressure relief valve 23. This also effectively saves on the overall area of ​​the reinforcing plate 313, reducing the material cost required for the reinforcing plate 313. In a specific embodiment, the projected area s of the pressure relief valve 23 on the bottom protective plate 11 is [missing information - likely mm]. 2 The projected area t mm of the reinforcing plate 313 on the bottom guard plate 11 2 The ratio s / t can be selected from specific values ​​such as 0.5, 0.55, 0.6, 0.8, 0.9, etc., and there are no restrictions here.

[0037] like Figure 5 As shown, in one embodiment of this application, the projected area s mm of the pressure relief valve 23 on the bottom protective plate 11 is... 2 Meets 300 mm 2 ≤s mm 2 ≤1400 mm 2 The projected area s mm of the pressure relief valve 23 on the bottom protective plate 11. 2 Less than 300 mm 2 In this case, the area of ​​the pressure relief valve 23 is relatively small, which can easily affect the depressurization rate of the single cell 2 after the pressure relief valve 23 ruptures. The projected area of ​​the pressure relief valve 23 on the bottom protective plate 11 is s mm. 2 Greater than 1400 mm 2 In such cases, it can easily affect the arrangement of the flow channel 32 or other structures of the heat exchange plate 30.

[0038] Therefore, the projected area s mm of the pressure relief valve 23 on the bottom guard plate 11 2 Meets 300 mm 2 ≤s mm 2 ≤1400 mm 2In this case, it can ensure the overall area of ​​the pressure relief valve 23, guaranteeing that the exhaust pressure reduction rate of the single cell 2 after the pressure relief valve 23 ruptures meets the requirements, and also facilitate the arrangement of the flow channel 32 or other structures of the heat exchange plate 30, thereby ensuring that the heat exchange area between the flow channel 32 and the bottom surface of the single cell 2 meets the requirements, and thus ensuring the heat exchange efficiency between the flow channel 32 and the single cell 2. In a specific embodiment, the projected area of ​​the pressure relief valve 23 on the bottom protective plate 11 is s mm. 2 300 mm can be selected 2 500 mm 2 800mm 2 1000mm 2 1400 mm 2 Specific values ​​are not limited here.

[0039] like Figure 5 As shown, in one embodiment of this application, the projected area t mm of the reinforcing plate 313 on the bottom protective plate 11 is... 2 Meets 500 mm 2 ≤t mm 2 ≤1600 mm 2 .

[0040] The projected area t mm of the reinforcing plate 313 on the bottom protective plate 11 2 Less than 500 mm 2 In this case, the coverage area of ​​the reinforcing plate 313 is relatively small, and some of the fluid ejected from the pressure relief valve 23 can easily spray out to areas outside the reinforcing plate 313 on the bottom guard plate 11, causing some areas of the bottom guard plate 11 to be impacted by the fluid ejected from the pressure relief valve 23, resulting in deformation and other issues. The projected area t mm of the reinforcing plate 313 on the bottom guard plate 11 is... 2 Greater than 1600 mm 2 In this case, the overall area of ​​the reinforcing plate 313 is relatively large, which increases the material cost required for the reinforcing plate 313.

[0041] Therefore, the projected area t mm of the reinforcing plate 313 on the bottom protective plate 11 is... 2 Meets 500 mm 2 ≤t mm 2 ≤1600mm 2 In this way, it can ensure that part of the fluid ejected from the pressure relief valve 23 will be ejected into the area within the reinforcing plate 313 on the bottom guard plate 11, thus avoiding the impact of the fluid ejected from the pressure relief valve 23 on the area of ​​the bottom guard plate 11. It can also effectively save the overall area of ​​the reinforcing plate 313, reducing the material cost required for the reinforcing plate 313.

[0042] In a specific embodiment, the projected area t mm of the reinforcing plate 313 on the bottom protective plate 11 2500 mm can be selected 2 600mm 2 1200mm 2 1400mm 2 1600 mm 2 Specific values ​​are not limited here.

[0043] In another embodiment of this application, the battery pack 20 includes at least one battery row 29. When the battery row 29 includes multiple individual battery cells 2 arranged along a first direction, the projections of the pressure relief valves 23 of the individual battery cells 2 within the battery row 29 onto the bottom protective plate 11 are all located within the projection of the same reinforcing plate 313 onto the bottom protective plate 11. That is, in this embodiment, a single reinforcing plate 313 can correspond to the pressure relief valves 23 of multiple individual battery cells 2 within the same battery row 29. This effectively reduces the required number of reinforcing plates 313, thereby improving the processing efficiency of the reinforcing plates 313.

[0044] In one embodiment of this application, the reinforcing plate 313 and the bottom protective plate 11 are integrally formed. Since the reinforcing plate 313 and the bottom protective plate 11 are integrally formed, they can be processed in the same processing step, thereby further improving the processing efficiency of the reinforcing plate 313.

[0045] like Figure 2 , Figure 3 and Figure 4 As shown, in another embodiment of this application, the reinforcing plate 313 is bonded and fixed to the bottom protective plate 11 of the pack body 10 via the adhesive layer 315. Since the reinforcing plate 313 is bonded and fixed to the bottom protective plate 11 of the pack body 10 via the adhesive layer 315, the fixed connection between the reinforcing plate 313 and the bottom protective plate 11 can be achieved simply and conveniently, avoiding mutual collision between the flow guide 31 of the heat exchange plate 30 and the bottom protective plate 11 when the battery pack is under vibration conditions, thereby improving the structural stability of the heat exchange plate 30 and the bottom protective plate 11.

[0046] In another embodiment of this application, the reinforcing plate 313 is welded and fixed to the bottom protective plate 11 of the package 10. That is, since the reinforcing plate 313 is welded and fixed to the bottom protective plate 11 of the package 10, the fixed connection strength between the reinforcing plate and the bottom protective plate can be improved, thereby improving the structural stability of the heat exchange plate 30 and the bottom protective plate 11.

[0047] In one embodiment of this application, the thickness of the reinforcing plate 313 is d mm, where d mm satisfies 0.5 mm ≤ d mm ≤ 2 mm.

[0048] When the thickness d mm of the reinforcing plate 313 is less than 0.5 mm, the impact resistance of the reinforcing plate 313 is poor, making it difficult to buffer the high-temperature and high-pressure fluid ejected from the pressure relief valve 23. This can easily lead to deformation or even melting of the reinforcing plate 313 due to the impact of the fluid ejected from the pressure relief valve 23. When the thickness d mm of the reinforcing plate 313 is greater than 2 mm, the thickness of the reinforcing plate 313 is too large, thus occupying too much space below the pressure relief valve 23 and affecting the efficiency of the high-temperature and high-pressure fluid ejected from the pressure relief valve 23 in discharging to the total exhaust port 13 of the casing 10. Therefore, when the thickness d mm of the reinforcing plate 313 meets the condition of 0.5 mm ≤ d mm ≤ 2 mm, it can not only ensure the impact resistance of the reinforcing plate 313 and effectively buffer the high-temperature and high-pressure fluid ejected from the pressure relief valve 23, preventing the reinforcing plate 313 from deforming or even melting due to the impact of the fluid ejected from the pressure relief valve 23, but also avoid the reinforcing plate 313 affecting the discharge efficiency of the high-temperature and high-pressure fluid ejected from the pressure relief valve 23 to the total exhaust port 13 of the pack 10. This allows the fluid ejected from the pressure relief valve 23 to be discharged from the total exhaust port 13 as soon as possible, increasing the discharge speed of the fluid ejected from the pressure relief valve 23 and minimizing the residence time of the high-temperature and high-pressure fluid ejected from the pressure relief valve 23 in the exhaust space 40. This reduces the impact of the high-temperature and high-pressure fluid on other individual cells 2, prevents the spread of thermal runaway, and effectively improves the working safety of the battery pack.

[0049] like Figure 3 As shown, in the height direction of the single battery cell 2, the distance between the reinforcing plate 313 and the pressure relief valve 23 is r mm, where r mm satisfies 4 mm ≤ r mm ≤ 15 mm. When the distance r mm between the reinforcing plate 313 and the pressure relief valve 23 is less than 4 mm, the fluid ejected after the pressure relief valve 23 ruptures will cause significant damage to the reinforcing plate 313 when it is ejected downwards. This could still lead to deformation or even melting of the reinforcing plate 313 due to the impact of at least part of the fluid ejected from the pressure relief valve 23. When the distance r mm between the reinforcing plate 313 and the pressure relief valve 23 is greater than 15 mm, it tends to occupy too much space, thereby reducing the energy density of the battery pack in this embodiment.

[0050] When the distance r mm between the reinforcing plate 313 and the pressure relief valve 23 satisfies 4 mm ≤ r mm ≤ 15 mm, it can be ensured that the impact of at least part of the fluid ejected from the pressure relief valve 23 on the reinforcing plate 313 is small, and the energy density of the battery pack in this embodiment can be effectively improved. In specific embodiments, the distance r mm between the reinforcing plate 313 and the pressure relief valve 23 can be selected from specific values ​​such as 4 mm, 5 mm, 8 mm, 12 mm, and 15 mm, and is not limited here.

[0051] like Figure 3As shown, in the height direction of a single cell, the distance between the reinforcing plate 313 and the heat exchange plate 30 is 0 mm, and 0 mm satisfies 3 mm ≤ 0 mm ≤ 13 mm.

[0052] When the distance between the reinforcing plate 313 and the heat exchange plate 30 is less than 3 mm, the reinforcing plate is prone to collision with the heat exchange plate during the up-and-down vibration of the bottom guard plate, causing the reinforcing plate or the heat exchange plate to deform due to the impact; when the distance between the reinforcing plate 313 and the heat exchange plate 30 is greater than 13 mm, the two occupy too much space, thereby reducing the energy density of the battery pack in this embodiment.

[0053] When the distance 0 mm between the reinforcing plate 313 and the heat exchange plate 30 satisfies 3 mm ≤ 0 mm ≤ 13 mm, the reserved space between the reinforcing plate and the heat exchange plate 30 is sufficient to prevent deformation caused by mutual impact between the reinforcing plate 313 and the bottom protective plate 11, and can effectively improve the energy density of the battery pack in this embodiment. In specific embodiments, the distance 0 mm between the reinforcing plate 313 and the heat exchange plate 30 can be selected from specific values ​​such as 3 mm, 5 mm, 8 mm, 12 mm, and 13 mm, and is not limited here.

[0054] In one embodiment of this application, the reinforcing plate 313 is one of aluminum, aluminum alloy, and steel. When the reinforcing plate 313 is made of at least any one of aluminum, aluminum alloy, and steel, the structural strength and high-temperature resistance of the reinforcing plate 313 can be effectively guaranteed, minimizing the possibility of deformation or even melting of the reinforcing plate 313 due to the impact of the fluid ejected from the pressure relief valve 23.

[0055] Specifically, in one embodiment of this application, a flow guide 31 is provided between the reinforcing plate 313 and the heat exchange plate 30. The upper end of the flow guide 31 is connected to the heat exchange plate 30, and the lower end is connected to the reinforcing plate 313.

[0056] Therefore, the reinforcing plate 313 can support the heat exchange plate 30 through the flow guide 31, preventing the heat exchange plate 30, especially its central area, from deforming downwards due to the pressure from the battery pack 20 after long-term use. This effectively improves the deformation resistance of the heat exchange plate 30, thereby effectively maintaining the exhaust space 40 between the heat exchange plate 30 and the bottom guard plate 11, ensuring that the fluid ejected from the pressure relief valve 23 is discharged outwards through the exhaust space 40 in a timely manner. Furthermore, it avoids contact between the main body of the heat exchange plate 30 and the bottom guard plate 11, preventing wear or short circuits, thus improving the working safety of the battery pack.

[0057] Furthermore, in one embodiment of this application, the upper end of the flow guide 31 is fixedly connected to the heat exchange plate 30, and the lower end is fixedly connected to the reinforcing plate 313. In this way, the heat exchange plate 30, the flow guide 31, and the reinforcing plate 313 are fixedly connected as a whole, thereby further improving the overall structural strength of the heat exchange plate 30, the flow guide 31, and the reinforcing plate 313.

[0058] Specifically, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment of this application, the flow guide includes a main baffle 311 and two side baffles 142 located on both sides of the main baffle 311. The main baffle 311 and the two side baffles 142 together form an air outlet 314. The main baffles 311 are all disposed on the same side of the bottom of the heat exchange plate 30 corresponding to the pressure relief valve 23, and at least a portion of the projection of the main baffles 311 on the bottom guard plate 11 is located between the projections of the two pressure relief valves 23 on the bottom guard plate 11. The flow guide 31 is configured to cause the fluid ejected from the pressure relief valve 23 to flow out from the air outlet 314 in the same direction. The main baffle 311 of the flow guide 31 enables at least a portion of the fluid ejected from the pressure relief valve 23 to move away from the main baffle 311 until it flows out in the same direction from the outlet 314 formed by the main baffle 311 and the two side baffles 142. This effectively restricts the flow direction of the high-temperature and high-pressure fluid. Since the projection of at least a portion of the main baffle 311 on the bottom guard plate 11 is located between the projections of the two pressure relief valves 23 on the bottom guard plate 11, the fluid ejected from the pressure relief valve 23 will be blocked by another main baffle 311 when it moves away from the main baffle 311. This avoids the area below the pressure relief valves 23 of other individual batteries 2, preventing the high-temperature and high-pressure fluid from flowing to the area below the pressure relief valves 23 of other individual batteries 2. This ensures that other individual batteries 2 will not be affected by the high-temperature and high-pressure fluid and will work normally. This effectively controls the thermal runaway of individual batteries 2, prevents the spread of thermal runaway, and effectively improves the working safety of the battery pack.

[0059] Furthermore, such as Figure 3 As shown, in the embodiment of this application, the battery pack 20 includes at least one battery row 29. When the battery row 29 includes a plurality of individual cells 2 arranged along a first direction, the distance between the main baffle 311 and the pressure relief valve 23 of the corresponding individual cell 2 in the first direction is k mm, where k mm satisfies 3 mm ≤ k mm ≤ 15 mm.

[0060] When the distance k mm between the main baffle 311 and the pressure relief valve 23 of the corresponding single cell 2 is less than 3 mm, interference is likely to occur between them. When there is a partial misalignment between the main baffle 311 and the pressure relief valve 23, the main baffle 311 may enter the corresponding area below the pressure relief valve 23, causing the main baffle 311 to fail to perform its flow guiding function properly. When the distance k mm between the main baffle 311 and the pressure relief valve 23 of the corresponding single cell 2 is greater than 15 mm, it may affect the arrangement of the flow channel 32 or other structures of the heat exchange plate 30.

[0061] Therefore, in the first direction, when the distance k mm between the main baffle 311 and the pressure relief valve 23 of the corresponding single cell 2 satisfies 3 mm ≤ k mm ≤ 15 mm, it can both avoid mutual interference between the two and ensure that the main baffle 311 is located on the side below the pressure relief valve 23, facilitating the normal functioning of the main baffle 311 in guiding the flow; it can also facilitate the arrangement of the flow channel 32 or other structures of the heat exchange plate 30, thereby ensuring that the heat exchange area between the flow channel 32 and the bottom surface of the single cell 2 meets the requirements, and thus ensuring the heat exchange efficiency between the flow channel 32 and the single cell 2. In a specific embodiment, the distance k mm between the main baffle 311 and the pressure relief valve 23 of the corresponding single cell 2 in the first direction can be selected from specific values ​​such as 3 mm, 5 mm, 6 mm, 10 mm, 15 mm, etc., and is not limited here.

[0062] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in the embodiment of this application, the battery pack 20 includes at least one battery row 29. When the battery row 29 includes a plurality of individual cells 2 arranged along a first direction, the heat exchange plate 30 is provided with at least one flow channel 32. The flow channel 32 extends along a second direction and is filled with heat exchange liquid to exchange heat with the individual cells 2. The second direction is perpendicular to the first direction and perpendicular to the height direction of the individual cells 2.

[0063] Because the heat exchange plate 30 has at least one flow channel 32, and a heat exchange liquid flows through the flow channel 32 to exchange heat with the individual battery cells 2, the heat exchange plate 30 can utilize the flowing heat exchange liquid to exchange heat, ensuring that the individual battery cells 2 operate within their optimal operating range. It is understood that the heat exchange liquid can be water, oil, ethylene glycol aqueous solution, etc., and is not limited thereto. Furthermore, since the flow channel 32 extends along the second direction, the heat exchange liquid in the same flow channel 32 can simultaneously exchange heat with multiple individual battery cells 2, thereby ensuring the heat exchange efficiency between the heat exchange plate 30 and the individual battery cells 2 of the battery pack 20.

[0064] like Figure 3As shown, in the first direction, the main baffle 311 is disposed between the pressure relief valve 23 of the corresponding single cell 2 and the corresponding flow channel 32, and the distance between the main baffle 311 and the corresponding flow channel 32 is n mm, where n mm satisfies 3 mm ≤ n mm ≤ 10 mm. When the distance n mm between the main baffle 311 and the corresponding flow channel 32 is less than 3 mm, interference is likely to occur between the main baffle 311 and the corresponding flow channel 32, affecting the normal setting of the main baffle 311; when the distance n mm between the main baffle 311 and the corresponding flow channel 32 is greater than 10 mm, the free space between the main baffle 311 and the corresponding flow channel 32 is large, affecting the heat exchange area between the flow channel 32 and the single cell 2, and thus affecting the heat exchange efficiency between the flow channel 32 and the single cell 2.

[0065] Therefore, when the distance n mm between the main baffle 311 and the corresponding flow channel 32 satisfies 3 mm ≤ n mm ≤ 10 mm, interference between the main baffle 311 and the corresponding flow channel 32 can be reduced, preventing the flow channel 32 from affecting the normal setting of the main baffle 311. It also ensures that the heat exchange area between the flow channel 32 and the bottom surface of the single cell 2 meets the requirements, thereby guaranteeing the heat exchange efficiency between the flow channel 32 and the single cell 2. In a specific embodiment, the distance n mm between the main baffle 311 and the corresponding flow channel 32 can be selected from specific values ​​such as 3 mm, 4 mm, 6 mm, 8 mm, and 10 mm. No specific limitations are imposed here.

[0066] This application also provides an electrical device that includes at least one of the aforementioned battery packs. It is understood that this electrical device can be any type of electrical device, such as an electric vehicle, an appliance with a battery pack, or an energy storage device, and is not limited thereto.

[0067] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0068] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0069] It should be understood that while terms such as "first" or "second" may be used in this application to describe various elements, these elements are not limited by these terms; these terms are merely used to distinguish one element from another. The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms "a," "the," and "the" as used in one or more embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0070] In this document, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, and not to define the absolute position of these related parts. Terms such as "equal" and "same" are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several subranges contained therein.

[0071] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of the embodiments of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0072] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, include: The battery pack (20) includes a plurality of individual cells (2) arranged in a row, and a pressure relief valve (23) is provided on the bottom surface of the individual cells (2). A heat exchange plate (30) is disposed at the bottom of the battery pack (20) and is configured to exchange heat with the individual battery cells (2). The heat exchange plate (30) is provided with a through-hole corresponding to the position of the pressure relief valve (23). The package (10) is provided with a bottom guard plate (11), and an exhaust space (140) is formed between the bottom guard plate (11) and the heat exchange plate (30). The package (10) is provided with a total exhaust port (13), and the gas ejected from the pressure relief valve (23) is configured to be discharged through the total exhaust port (13). Among them, the bottom guard plate (11) is provided with reinforcing plates (313) at the positions corresponding to the pressure relief valve (23), and the projection of the pressure relief valve (23) on the bottom guard plate (11) is located within the projection of the reinforcing plate (313) on the bottom guard plate (11).

2. The battery pack according to claim 1, characterized in that, Multiple reinforcing plates (313) are provided, and the reinforcing plates (313) protrude from the upper surface of the bottom protective plate (11).

3. The battery pack according to claim 2, characterized in that, The projected area of ​​the pressure relief valve (23) on the bottom guard plate (11) is s mm. 2 The projected area of ​​the reinforcing plate (313) on the bottom protective plate (11) is t mm. 2 s / t satisfies 0.5≤s / t≤0.

9.

4. The battery pack according to claim 3, characterized in that, The pressure relief valve (23) has a projected area of ​​s mm on the bottom protective plate (11). 2 Meets 300 mm 2 ≤s mm 2 ≤1400 mm 2 .

5. The battery pack according to claim 3, characterized in that, The projected area t mm of the reinforcing plate (313) on the bottom protective plate (11) 2 Meets 500 mm 2 ≤t mm 2 ≤1600 mm 2 .

6. The battery pack according to claim 1, characterized in that, The battery pack (20) includes at least one battery row (29), and the battery row (29) includes a plurality of individual cells (2) arranged along a first direction. The projections of the pressure relief valves (23) of the individual cells (2) in the battery row (29) on the bottom guard plate (11) are all located within the projection of the reinforcing plate (313) on the bottom guard plate (11).

7. The battery pack according to claim 1, characterized in that, The reinforcing plate (313) and the bottom protective plate (11) are integrally formed.

8. The battery pack according to claim 1, characterized in that, The reinforcing plate (313) is bonded and fixed to the bottom protective plate (11) of the package (10) by an adhesive layer (315).

9. The battery pack according to claim 1, characterized in that, The reinforcing plate (313) is welded and fixed to the bottom protective plate (11) of the package body (10).

10. The battery pack according to claim 1, characterized in that, The thickness of the reinforcing plate (313) is d mm, and d mm satisfies 0.5 mm ≤ d mm ≤ 2 mm.

11. The battery pack according to claim 1, characterized in that, In the height direction of the single cell, the distance between the reinforcing plate (313) and the pressure relief valve (23) is r mm, where r mm satisfies 4 mm ≤ r mm ≤ 15 mm.

12. The battery pack according to any one of claims 1 to 8, characterized in that, In the height direction of the single cell, the distance between the reinforcing plate (313) and the heat exchange plate (30) is 0 mm, and 0 mm satisfies 3 mm ≤ 0 mm ≤ 13 mm.

13. The battery pack according to claim 1, characterized in that, The reinforcing plate (313) is one of aluminum, aluminum alloy and steel.

14. The battery pack according to claim 1, characterized in that, A flow guide (31) is provided between the reinforcing plate (313) and the heat exchange plate (30). The upper end of the flow guide (31) is connected to the heat exchange plate (30), and the lower end is connected to the reinforcing plate (313).

15. The battery pack according to claim 14, characterized in that, The upper end of the flow guide (31) is fixedly connected to the heat exchange plate (30), and the lower end is fixedly connected to the reinforcing plate (313).

16. The battery pack according to claim 15, characterized in that, The flow guide includes a main baffle (311) and two side baffles (142) located on both sides of the main baffle (311). The main baffle (311) and the two side baffles (142) together form an air outlet (314). The main baffles (311) are all located on the same side of the bottom of the heat exchange plate (30) corresponding to the pressure relief valve (23), and at least part of the projection of the main baffles (311) on the bottom guard plate (11) is located between the projections of the two pressure relief valves (23) on the bottom guard plate (11). The flow guide (31) is configured to allow the fluid ejected by the pressure relief valve (23) to flow out from the air outlet (314) in the same direction.

17. The battery pack according to claim 16, characterized in that, The battery pack (20) includes at least one battery row (29), and the battery row (29) includes a plurality of individual cells (2) arranged along a first direction. In the first direction, the distance between the main baffle (311) and the pressure relief valve (23) corresponding to the single cell (2) is k mm, where k mm satisfies 3 mm ≤ k mm ≤ 15 mm.

18. The battery pack according to claim 16, characterized in that, The battery pack (20) includes at least one battery row (29), and the battery row (29) includes a plurality of individual cells (2) arranged along a first direction. The heat exchange plate (30) is provided with at least one flow channel (32), the flow channel (32) extends along the second direction and is filled with heat exchange liquid to exchange heat with the single cell (2); the second direction is perpendicular to the first direction and perpendicular to the height direction of the single cell (2); In the first direction, the main baffle (311) is disposed between the pressure relief valve (23) corresponding to the single cell (2) and the flow channel (32), and the distance between the main baffle (311) and the flow channel (32) is n mm, where n mm satisfies 3 mm ≤ n mm ≤ 10 mm.

19. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 18.

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