Battery pack and electric device

Abstract

The application relates to the field of batteries, and specifically provides a battery pack and an electric device, the battery pack comprising a battery group, a heat exchange plate and a box body; the battery group comprises a plurality of arranged battery monomers, the bottom surface of the battery monomers is provided with an explosion-proof valve; the heat exchange plate is arranged at the bottom of the battery group and is configured to exchange heat with the battery monomers, the heat exchange plate is provided with a through hole corresponding to the position of the explosion-proof valve; the box body is provided with a bottom guard plate, and an exhaust space is enclosed between the bottom guard plate and the heat exchange plate; wherein the bottom surface of the heat exchange plate is provided with a blocking piece, the blocking piece is arranged at the position adjacent to the corresponding explosion-proof valve at the bottom of the heat exchange plate and is configured to make at least part of the fluid sprayed by the explosion-proof valve move in a direction away from the blocking piece. The application changes the direction of the fluid sprayed by the explosion-proof valve by arranging the blocking piece at the position of the explosion-proof valve, reduces the influence on the adjacent battery, and improves the working safety of the battery pack.

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 explosions. Therefore, battery casings are often equipped with explosion-proof 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 explosion-proof valve from directly impacting electrical components and causing problems such as short circuits and insulation failure, batteries with explosion-proof valves located at the bottom have been developed. Because the explosion-proof 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 battery cell ruptures its explosion-proof valve due to thermal runaway, the fluid ejected from the explosion-proof valve will have a relatively high temperature and pressure. When the high-temperature and high-pressure fluid flows along the gap between the battery and the bottom protection plate to the explosion-proof valves of other batteries, it can easily cause the explosion-proof valves of other batteries to be ejected in a chain reaction, thus having a significant impact on the battery pack. 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 battery cell in an existing battery pack explodes due to thermal runaway, at least part of the fluid ejected from the explosion-proof valve has a relatively high temperature and pressure. When the high-temperature and high-pressure fluid flows along the gap between the battery and the bottom guard plate to the explosion-proof valves of other batteries, it can easily cause the explosion-proof valves of other batteries to be ejected in a chain reaction.

[0006] The first aspect of this application provides a battery pack, comprising: A battery pack, comprising multiple battery cells arranged in an array, wherein an explosion-proof valve is provided on the bottom surface of each battery cell; A heat exchange plate is disposed at the bottom of the battery pack and exchanges heat with the individual battery cells. The heat exchange plate is provided with a through-hole corresponding to the position of the explosion-proof valve. The housing is provided with a bottom protective plate, and an exhaust space is formed between the bottom protective plate and the heat exchange plate; The heat exchange plate has a blocking member on its bottom surface. The blocking member is located at the bottom of the heat exchange plate near the position corresponding to the explosion-proof valve and is configured to cause at least a portion of the fluid ejected from the explosion-proof valve to move away from the blocking member.

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

[0008] During the operation of the battery pack in the above embodiments of this application, the ejected fluid, such as ejected material, after the explosion-proof valve of any battery cell ruptures can be discharged downward through the through-hole to the exhaust space between the bottom guard plate and the heat exchange plate of the housing. Since a blocking member is provided at the bottom of the heat exchange plate near the position corresponding to the explosion-proof valve, the blocking member can cause at least a portion of the fluid ejected from the explosion-proof valve to move away from the blocking member. This facilitates the control of the flow path of at least a portion of the fluid ejected from the explosion-proof valve by using the blocking member, reducing the possibility of the fluid ejected from the explosion-proof valve flowing through the area below the explosion-proof valve of other battery cells, reducing the impact of high-temperature and high-pressure fluid on other battery cells, preventing high-temperature and high-pressure fluid from triggering a chain reaction of explosion-proof valves of other battery cells, ensuring that other battery cells can still operate normally without being affected, effectively controlling the thermal runaway of battery cells, preventing the spread of thermal runaway, and effectively improving the working safety of the battery pack. Attached Figure Description

[0009] It should be understood that the following figures only illustrate certain embodiments of this application and should not be construed as limiting 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] Figure 6 This is a partial bottom view of the battery pack according to an embodiment of this application.

[0018] Figure 7 This is a partial cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0019] Attached image labels: 10. Housing; 11. Bottom panel; 12. Frame; 13. Main exhaust port; 20. Battery pack; 2. Battery cell; 21. Housing; 22. Cover plate; 23. Explosion-proof valve; 29. ​​Battery row; 30. Heat exchange plate; 31. Baffle; 311. Main baffle; 312. Side baffle; 313. Bottom baffle; 314. Air outlet; 315. Adhesive layer; 32. Flow channel; 40. Exhaust space.

[0020] X - First direction; Y - Second direction; Z - Height direction. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] like Figures 1 to 7 As shown in the figure, this application embodiment provides a battery pack, including a housing 10, a battery pack 20, and a heat exchange plate 30. The housing 10 includes a bottom protective plate 11 and a frame 12 fixed to the outer periphery of the bottom protective plate 11, with the bottom protective plate 11 and the frame 12 forming a receiving cavity. The receiving cavity is used to accommodate various structures required for the battery pack.

[0024] 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 housing 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 battery cells 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 an isolation plate. Both the battery cells 2 and the isolation plate are located within the housing 10. The isolation plate is located on the side of the battery cell 2 furthest from the bottom protective plate 11 of the housing 10, separating the battery cell 2 from other components located above it, thus providing isolation.

[0025] Specifically, the aforementioned enclosure 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 enclosure 10 provides installation space for the battery pack 20, BMS, cooling system, electrical connection components, etc., and through reasonable structural design, fixes these components inside the enclosure 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.

[0026] The housing 10 may include a lower housing and an upper housing. The lower housing includes a bottom protective plate 11 and a frame 12 connected to and surrounding the bottom protective plate 11. The upper housing is connected to the frame 12 and has a cover plate 22 opposite to the bottom protective plate 11. The upper and lower housings 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 housing 10 is a cube, the frame 12 of the lower housing generally has four side plates, which surround the periphery of the bottom protective plate 11. In other embodiments, the shape of the housing 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 casing 10 can be cast from materials such as steel and aluminum alloy, or lightweight materials such as glass fiber reinforced composite material and carbon fiber reinforced composite material.

[0027] like Figure 1 and Figure 2As shown, the battery pack 20 is disposed in the receiving cavity. The battery pack 20 includes a plurality of battery cells 2 arranged in a row. An explosion-proof valve 23 is disposed on the bottom surface of the battery cell 2.

[0028] Understandably, multiple battery cells 2 with similar capacity and internal resistance are connected in series or parallel to form a battery pack 20. The battery cells 2 can store chemical energy and controllably convert chemical energy into electrical energy. In a recyclable battery, the active materials can be activated by charging after discharge so that it can continue to be used.

[0029] Each battery cell 2 includes at least a housing 21 and a cover plate 22 fixedly connected to each other, as well as a battery cell and an electrolyte. The housing 21 and the cover plate 22 are used together to contain the battery cell and the electrolyte. The cover plate 22 may be provided with at least one positive electrode post and at least one negative electrode post for electrical connection with the outside. The battery cell includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and separators. The separator is located between adjacent positive and negative electrode plates to insulate them. At least one end of the electrode assembly has a tab, one end of which is electrically connected to the tab, and the other end is electrically connected to the electrode post. It is understood that the battery cell 2 in this embodiment can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and is not limited thereto.

[0030] An explosion-proof valve 23 refers to a component or part that can be actuated to release internal pressure or temperature when the internal pressure or temperature of a single battery cell 2 reaches a predetermined threshold. During battery use, the explosion-proof valve 23 is mainly used to allow gas to escape from the battery and reduce internal pressure in the event of thermal runaway or other situations, preventing excessive pressure buildup that could cause deformation or explosion. The material of the explosion-proof valve 23 is not limited, including but not limited to aluminum, steel, and alloys. The shape of the explosion-proof valve 23 is not limited, such as square, oblong, elliptical, racetrack-shaped, etc. The type of explosion-proof valve 23 is not limited, such as a notched explosion-proof valve 23, which can be formed by stamping or laser etching.

[0031] Since an explosion-proof valve 23 is installed on the bottom surface of the battery cell 2, when the internal pressure of the battery reaches the pressure relief strength of the explosion-proof valve 23, the explosion-proof valve 23 will connect with the outside and release pressure in time; the ejected material and other fluids from the explosion-proof valve 23 will be discharged downwards to avoid direct contact with the electrical components above the battery cell 2, so as to achieve thermal and electrical separation and improve the overall safety of the battery pack.

[0032] The heat exchange plate 30 is disposed at the bottom of the battery pack 20 and exchanges heat with the battery cell 2; specifically, the heat exchange plate 30 is attached to the bottom surface of the battery cell 2 and can heat and / or cool the battery cell 2 as needed.

[0033] The heat exchange plate 30 is a component for regulating the temperature of the battery cell 2. The heat exchange plate 30 has an internal heat exchange channel for circulating 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 battery cell 2, and then exits through the outlet, thus achieving heat exchange for the 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, such as aluminum alloy or magnesium alloy; it can also be made of plastic. Figure 2 and Figure 3 As shown, the heat exchange plate 30 is provided with a through-hole corresponding to the position of the explosion-proof valve 23, and an exhaust space 40 is formed between the bottom guard plate 11 of the housing 10 and the heat exchange plate 30. In this way, because the heat exchange plate 30 is provided with a through-hole corresponding to the position of the explosion-proof valve 23, the ejected material and other fluids from the explosion-proof valve 23 can be discharged downward through the through-hole to the exhaust space 40 between the bottom guard plate 11 of the housing 10 and the heat exchange plate 30.

[0034] like Figure 2 and Figure 3 As shown, in one embodiment of this application, a main exhaust port 13 is provided on the housing 10, and the exhaust space 40 of the main exhaust port 13 is connected. Fluids such as ejected material from the explosion-proof valve 23 can be discharged downward through the through-hole to the exhaust space 40 between the bottom guard plate 11 and the heat exchange plate 30 of the housing 10, and then discharged from the main exhaust port 13 on the housing 10 to the outside of the battery pack.

[0035] Among them, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a blocking member 31 is provided on the bottom surface of the heat exchange plate 30. The blocking member 31 is located at the bottom of the heat exchange plate 30 near the corresponding explosion-proof valve 23, and is configured to cause at least a portion of the fluid ejected from the explosion-proof valve 23 to move away from the blocking member 31. It should be noted that the fluid ejected from the explosion-proof valve 23 in this application can be understood as high-temperature airflow, metal particles or other substances ejected from inside the battery through the explosion-proof valve 23.

[0036] Therefore, during the operation of the battery pack in this embodiment, the fluid ejected after the explosion-proof valve 23 of any battery cell 2 breaks can be discharged downward through the through-hole to the exhaust space 40 between the bottom guard plate 11 and the heat exchange plate 30 of the housing 10. Since a blocking member 31 is provided at the bottom of the heat exchange plate 30 near the position corresponding to the explosion-proof valve 23, the blocking member 31 can cause at least part of the fluid ejected from the explosion-proof valve 23 to move away from the blocking member 31. This facilitates the control of the flow path of at least part of the fluid ejected from the explosion-proof valve by the blocking member 31, reduces the possibility of the fluid ejected from the explosion-proof valve 23 flowing through the area below the explosion-proof valve 23 of other battery cells, reduces the impact of high-temperature and high-pressure fluid on other battery cells 2, prevents high-temperature and high-pressure fluid from causing the explosion-proof valve 23 of other battery cells 2 to be ejected in a chain reaction, ensures that other battery cells 2 can still work normally without being affected, effectively controls the thermal runaway of battery cells 2, prevents the spread of thermal runaway, and effectively improves the working safety of the battery pack.

[0037] Specifically, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment of this application, the blocking member 31 includes a main partition 311. The main partitions 311 are all disposed on the same side of the bottom of the heat exchange plate 30 corresponding to the explosion-proof valve 23, and at least a portion of the projection of the main partitions 311 on the bottom guard plate 11 is located between the projections of the two explosion-proof valves 23 on the bottom guard plate 11. Since the main partitions 311 are all located on the same side of the bottom of the heat exchange plate 30 corresponding to the explosion-proof valves 23, the main partitions 311 of the blocking member 31 can cause at least a portion of the fluid ejected from the explosion-proof valves 23 to move away from the main partitions 311. Furthermore, the projection of at least a portion of the main partitions 311 on the bottom guard plate 11 is located between the projections of the two explosion-proof valves 23 on the bottom guard plate 11. When at least a portion of the fluid ejected from the explosion-proof valves 23 moves away from the main partitions 311, it will be blocked by another main partition 311, thereby bypassing the area below the explosion-proof valves 23 of other battery cells 2. This prevents the high-temperature and high-pressure fluid from flowing to the area below the explosion-proof valves 23 of other battery cells 2, ensuring that other battery cells 2 will not be affected by the high-temperature and high-pressure fluid and will work normally. This can effectively control the thermal runaway of the battery cells 2, prevent the spread of thermal runaway, and effectively improve the working safety of the battery pack.

[0038] Furthermore, such as Figure 6 As shown, in the battery pack of this application embodiment, the battery pack includes at least one battery row 29, and the battery row 29 includes a plurality of battery cells 2 arranged along a first direction; wherein, the main separator 311 is configured to extend along a second direction; the second direction is perpendicular to the first direction and perpendicular to the height direction of the battery cells 2.

[0039] Since the main partition 311 extends along the second direction, at least a portion of the fluid ejected from the explosion-proof valve 23 can move along the first direction toward the main partition 311 away from the blocking member 31. Furthermore, the projection of at least a portion of the main partition 311 on the bottom protective plate 11 is located between the projections of the two explosion-proof valves 23 on the bottom protective plate 11. When at least a portion of the fluid ejected from the explosion-proof valve 23 moves away from the main partition 311, it will be blocked by another main partition 311, thereby bypassing the area below the explosion-proof valve 23 of other battery cells 2. This prevents high-temperature and high-pressure fluid from flowing to the area below the explosion-proof valve 23 of other battery cells 2, ensuring that other battery cells 2 will not be affected by high-temperature and high-pressure fluid and will work normally. This effectively controls the thermal runaway of battery cells 2, prevents the spread of thermal runaway, and effectively improves the working safety of the battery pack.

[0040] like Figure 6 As shown, in one embodiment of this application, in the second direction, the extension length of the blocking member 31 is imm, the extension length of the explosion-proof valve 23 is j mm, and i / j satisfies 1.2≤i / j≤1.8.

[0041] When the ratio i / j of the extension length i mm of the blocking member 31 to the extension length j mm of the explosion-proof valve 23 is less than 1.2, it cannot be guaranteed that all the fluid ejected from the explosion-proof valve 23 will move away from the main partition 311 under the action of the blocking member 31. When the ratio i / j of the extension length i mm of the blocking member 31 to the extension length j mm of the explosion-proof valve 23 is greater than 1.8, the blocking member 31 will occupy more space, affecting the arrangement of other structures. Therefore, when the ratio i / j of the extension length i mm of the blocking member 31 to the extension length j mm of the explosion-proof valve 23 satisfies 1.2≤i / j≤1.8, it can be basically guaranteed that all the fluid ejected from the explosion-proof valve 23 will move away from the main partition 311 under the action of the blocking member 31, while effectively saving the space occupied by the blocking member 31 and facilitating the arrangement of other structures. In a specific embodiment, the ratio i / j of the extension length i mm of the blocking member 31 to the extension length j mm of the explosion-proof valve 23 can be selected as specific values ​​such as 1.2, 1.3, 1.5, 1.6, 1.8, etc., and is not limited here.

[0042] Furthermore, such as Figure 6 As shown, in the second direction, the extension length j mm of the explosion-proof valve 23 satisfies 25 mm ≤ j mm ≤ 65 mm. When the extension length j mm of the explosion-proof valve 23 is less than 25 mm, the area where the explosion-proof valve 23 can be arranged is small, which can easily affect the exhaust pressure reduction rate of the battery cell 2 after the explosion-proof valve 23 ruptures; when the extension length j mm of the explosion-proof valve 23 is greater than 65 mm, it can easily affect the arrangement of the flow channel 32 or other structures of the heat exchange plate 30.

[0043] Therefore, in the second direction, when the extension length j mm of the explosion-proof valve 23 satisfies 25 mm ≤ j mm ≤ 65 mm, it can ensure the overall area of ​​the explosion-proof valve 23, ensure that the exhaust pressure reduction speed of the battery cell 2 after the explosion-proof valve 23 is broken, and 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 battery cell 2 can meet the requirements, and thus ensuring the heat exchange efficiency between the flow channel 32 and the battery cell 2.

[0044] In a specific embodiment, the specific value of the extension length j mm of the explosion-proof valve 23 can be selected from specific values ​​such as 25 mm, 40 mm, 50 mm, 60 mm, 65 mm, etc., and is not limited here.

[0045] like Figure 6 As shown, in the second direction, the extension length i mm of the main partition 311 satisfies 35 mm ≤ i mm ≤ 85 mm. When the extension length i mm of the main partition 311 in the second direction is less than 35 mm, the blocking effect of the main partition 311 is poor, and it cannot be guaranteed that the fluid ejected from the explosion-proof valve 23 can move away from the main partition 311 under the action of the blocking member 31; when the extension length i mm of the main partition 311 is greater than 85 mm, it is easy to affect the arrangement of the flow channel 32 or other structures of the heat exchange plate 30.

[0046] Therefore, in the second direction, when the extension length i mm of the main partition 311 satisfies 35 mm ≤ i mm ≤ 85 mm, it can both ensure the blocking effect of the main partition 311, allowing the fluid ejected from the explosion-proof valve 23 to move away from the main partition 311 under the action of the main partition 311, and 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 battery cell 2 meets the requirements, and thus ensuring the heat exchange efficiency between the flow channel 32 and the battery cell 2. In a specific embodiment, the specific value of the extension length i mm of the main partition 311 can be selected from 35 mm, 40 mm, 50 mm, 70 mm, 85 mm, etc., and is not limited here.

[0047] like Figure 6 As shown, in one embodiment of this application, in the first direction, the distance between the main separator 311 and the explosion-proof valve 23 of the corresponding battery cell 2 is k mm, where k mm satisfies 3 mm ≤ k mm ≤ 15 mm.

[0048] When the distance k mm between the main separator 311 and the explosion-proof valve 23 of the corresponding battery cell 2 is less than 3 mm, interference is likely to occur between them. When there is a partial misalignment between the main separator 311 and the explosion-proof valve 23, the main separator 311 is likely to enter the corresponding area below the explosion-proof valve 23, causing the main separator 311 to fail to perform its flow guiding function properly. When the distance k mm between the main separator 311 and the explosion-proof valve 23 of the corresponding battery cell 2 is greater than 15 mm, it is likely to affect the arrangement of the flow channel 32 or other structures of the heat exchange plate 30.

[0049] Therefore, in the first direction, when the distance k mm between the main separator 311 and the explosion-proof valve 23 of the corresponding battery cell 2 satisfies 3 mm ≤ k mm ≤ 15 mm, it can both avoid mutual interference between the two and ensure that the main separator 311 is located on the side below the explosion-proof valve 23, facilitating the normal functioning of the main separator 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 battery cell 2 meets the requirements, and thus ensuring the heat exchange efficiency between the flow channel 32 and the battery cell 2. In a specific embodiment, the distance k mm between the main separator 311 and the explosion-proof valve 23 of the corresponding battery 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.

[0050] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment of this application, the heat exchange plate 30 is provided with at least one flow channel 32, through which a heat exchange liquid flows to exchange heat with the battery cell 2. Because the heat exchange plate 30 has at least one flow channel 32, through which a heat exchange liquid flows to exchange heat with the battery cell 2, the heat exchange plate 30 can utilize the flowing heat exchange liquid for heat exchange, ensuring that the battery cell 2 operates within its optimal operating range. It is understood that the heat exchange liquid can be water, oil, an aqueous solution of ethylene glycol, etc., and is not limited thereto.

[0051] Furthermore, such as Figure 5As shown, in one embodiment of this application, when the battery pack 20 includes at least one battery row 29, and the battery row 29 includes a plurality of battery cells 2 arranged along a first direction, the flow channel 32 is configured to extend along either the first or second direction, wherein the second direction is perpendicular to the first direction and perpendicular to the height direction of the battery cells 2. Since the flow channel 32 extends along either the first or second direction, the heat exchange liquid within the same flow channel 32 can simultaneously exchange heat with the plurality of battery cells 2 arranged along the first direction or simultaneously with the plurality of battery cells 2 arranged along the second direction, thereby ensuring the heat exchange efficiency between the heat exchange plate 30 and the battery cells 2 of the battery pack 20.

[0052] Furthermore, in one embodiment of this application, the flow channel 32 extends along a second direction. In the first direction, the main partition 311 is disposed between the explosion-proof valve 23 of the corresponding battery cell 2 and the corresponding flow channel 32. That is, the main partition 311 can occupy the space between the explosion-proof valve 23 and the corresponding flow channel 32, so as to avoid encroaching on the area where the explosion-proof valve 23 is located and the area where the flow channel 32 is located.

[0053] like Figure 6 As shown, in one embodiment of this application, the distance between the main separator 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 separator 311 and the corresponding flow channel 32 is less than 3 mm, interference is likely to occur between the main separator 311 and the corresponding flow channel 32, affecting the normal setting of the main separator 311. When the distance n mm between the main separator 311 and the corresponding flow channel 32 is greater than 10 mm, the free space between the main separator 311 and the corresponding flow channel 32 is large, affecting the heat exchange area between the flow channel 32 and the battery cell 2, and thus affecting the heat exchange efficiency between the flow channel 32 and the battery cell 2.

[0054] Therefore, when the distance n mm between the main separator 311 and the corresponding flow channel 32 satisfies 3 mm ≤ n mm ≤ 10 mm, interference between the main separator 311 and the corresponding flow channel 32 can be reduced, preventing the flow channel 32 from affecting the normal setting of the main separator 311. It also ensures that the heat exchange area between the flow channel 32 and the bottom surface of the battery cell 2 meets the requirements, thereby guaranteeing the heat exchange efficiency between the flow channel 32 and the battery cell 2. In specific embodiments, the distance n mm between the main separator 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.

[0055] Furthermore, such as Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, in one embodiment of this application, the blocking member 31 further includes two side partitions 312 located on both sides of the main partition 311 to form an outlet 314 between the ends of the two side partitions 312 away from the main partition 311; the blocking member 31 is configured to cause at least a portion of the fluid ejected from the explosion-proof valve 23 to flow out from the outlet 314 in the same direction.

[0056] Since the blocking member 31 includes a main partition 311 and two side partitions 312 located on both sides of the main partition 311, forming an outlet 314 between the ends of the two side partitions 312 away from the main partition 311, the high-temperature and high-pressure fluid ejected from the explosion-proof valve 23 can flow out from the outlet 314, effectively limiting the flow direction of the high-temperature and high-pressure fluid. Furthermore, since the blocking member 31 allows at least a portion of the fluid ejected from the explosion-proof valve 23 to flow out from the outlet 314 in the same direction, after at least a portion of the fluid ejected from the explosion-proof valves 23 of different battery cells 2 flows out from the outlet 314 in the same direction, it can be blocked by another blocking member 31, thus bypassing the area below the explosion-proof valves 23 of other battery cells 2, i.e., the internal area of ​​the blocking member 31. This ensures that other battery cells 2 are not affected by the high-temperature and high-pressure fluid and can operate normally, preventing thermal runaway propagation and improving the operational safety of the battery pack.

[0057] like Figure 6 As shown, in one embodiment of this application, in the second direction, the distance between the two side partitions 312 is p mm, where p mm satisfies 35 mm ≤ p mm ≤ 85 mm. When the distance p mm between the two side partitions 312 is less than 35 mm, the overall blocking effect of the blocking member 31 is poor, and it cannot be guaranteed that the fluid ejected from the explosion-proof valve 23 can move away from the main partition 311 under the action of the blocking member 31; when the distance p mm between the two side partitions 312 is greater than 85 mm, it can easily affect the arrangement of the flow channel 32 or other structures of the heat exchange plate 30.

[0058] Therefore, in the second direction, when the distance p mm between the two side partitions 312 satisfies 35 mm ≤ p mm ≤ 85 mm, it ensures the blocking effect of the blocking member 31, allowing the fluid ejected from the explosion-proof valve 23 to move away from the main partition 311 under the action of the blocking member 31. It also facilitates 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 battery cell 2 meets the requirements, and thus ensuring the heat exchange efficiency between the flow channel 32 and the battery cell 2. In a specific embodiment, the distance p mm between the two side partitions 312 can be selected from specific values ​​such as 35 mm, 50 mm, 60 mm, 70 mm, and 85 mm, and is not limited here.

[0059] like Figure 6As shown, in the first direction, the extension length of the blocking member 31 is q mm, where q mm satisfies 14 mm ≤ q mm ≤ 40 mm. When the extension length of the blocking member 31 is less than 14 mm, the overall blocking effect of the blocking member 31 is poor. After the fluid ejected from the explosion-proof valve 23 flows out from the outlet 314, it may still move to both sides away from the main partition 311 of the blocking member 31, thereby reducing the flow guiding effect of the blocking member 31. When the extension length of the blocking member 31 is greater than 40 mm, it can easily affect the arrangement of the flow channel 32 or other structures of the heat exchange plate 30.

[0060] Therefore, when the extension length q mm of the blocking member 31 satisfies 14 mm ≤ q mm ≤ 40 mm, it ensures both the flow guiding effect of the blocking member 31, allowing the fluid ejected from the explosion-proof valve 23 to flow as far away from the main partition 311 as possible after exiting the outlet 314, and facilitates the arrangement of the flow channel 32 or other structures of the heat exchange plate 30. This ensures that the heat exchange area between the flow channel 32 and the bottom surface of the battery cell 2 meets the requirements, thereby ensuring the heat exchange efficiency between the flow channel 32 and the battery cell 2. In specific embodiments, the extension length q mm of the blocking member 31 can be selected from specific values ​​such as 14 mm, 20 mm, 30 mm, 35 mm, and 40 mm, and is not limited here.

[0061] Furthermore, such as Figure 2 As shown, in an embodiment of this application, the battery pack 20 includes at least one battery row 29. When the battery row 29 includes multiple battery cells 2 arranged along a first direction, in one embodiment of this application, the vents 314 of the blocking member 31 are all oriented towards the negative direction of the first direction, and the main exhaust port 13 is located on the side of the housing 10 in the negative direction of the first direction. It is understood that the negative direction and the positive direction are two pointing directions of any given direction; please refer to the accompanying drawings for specific directions. Since the outlets 314 of the blocking members 31 are all oriented towards the negative direction of the first direction, and the total exhaust port 13 is located on the side of the housing 10 in the negative direction of the first direction, the blocking members 31 can cause at least a portion of the fluid ejected from the explosion-proof valve 23 to flow out in the negative direction of the first direction. After being blocked by another blocking member 31 and bypassing the area below the explosion-proof valve 23 of other battery cells 2, it continues to flow in the negative direction of the first direction until it is discharged from the total exhaust port 13 located on the side of the housing 10 in the negative direction of the first direction to the outside of the battery pack. Therefore, the above structure can effectively increase the discharge speed of at least a portion of the fluid ejected from the explosion-proof valve 23, minimize the residence time of the high-temperature and high-pressure fluid ejected from the explosion-proof valve 23 in the exhaust space 40, reduce the impact of the high-temperature and high-pressure fluid on other battery cells 2, effectively control the thermal runaway of the battery cells 2, prevent the spread of thermal runaway, and effectively improve the working safety of the battery pack.

[0062] Furthermore, such as Figure 4 and Figure 5 As shown, in one embodiment of this application, an arc-shaped transition portion is provided between the main partition 311 and the side partition 312. Because an arc-shaped transition portion is provided between the main partition 311 and the side partition 312, after at least part of the fluid ejected from the explosion-proof valve 23 flows out in the negative direction of the first direction under the action of the corresponding blocking member 31, it is blocked by another blocking member 31 to bypass the area below the explosion-proof valve 23 of other battery cells 2. In the process, the flow rate of the high-temperature and high-pressure fluid will not drop significantly, thereby effectively increasing the discharge speed of at least part of the fluid ejected from the explosion-proof valve 23, further reducing the residence time of the high-temperature and high-pressure fluid ejected from the explosion-proof valve 23 in the exhaust space 40, so as to reduce the impact of the high-temperature and high-pressure fluid on other battery cells 2 and further prevent the spread of thermal runaway.

[0063] Furthermore, in one embodiment of this application, the battery pack 20 includes two parallel battery rows 29, each battery row 29 including a plurality of battery cells 2 arranged along a first direction, and the two battery rows 29 are arranged along a second direction; the blocking member 31 is configured to cause at least a portion of the fluid ejected from the explosion-proof valve 23 of the corresponding battery cell 2 to flow out from the vent 314 in a direction away from the other battery row 29.

[0064] Since the battery pack 20 includes two parallel rows of batteries 29 arranged along the second direction, the blocking member 31 causes at least a portion of the fluid ejected from the explosion-proof valve 23 of the corresponding battery cell 2 to flow out from the vent 314 in a direction away from the other battery row 29. This completely prevents the high-temperature and high-pressure fluid from flowing through the area below the explosion-proof valve 23 of other battery cells 2 on the path to the total exhaust port 13, preventing the high-temperature and high-pressure fluid from triggering a chain reaction of the explosion-proof valves 23 of other battery cells 2, ensuring that other battery cells 2 can still operate normally without being affected, effectively controlling the thermal runaway of battery cells 2, preventing the spread of thermal runaway, and effectively improving the working safety of the battery pack.

[0065] Furthermore, in one embodiment of this application, the blocking member 31 is configured to cause at least a portion of the fluid ejected from the explosion-proof valve 23 to flow out of the vent 314 in either the positive or negative direction of the second direction. Since the blocking member 31 allows at least a portion of the fluid ejected from the explosion-proof valve 23 to flow out of the vent 314 in either the positive or negative direction of the second direction, the fluid flowing out of the vent 314, after being blocked by the frame 12 of the housing 10, continues to flow towards the main exhaust port 13 on the housing 10 until it is discharged from the main exhaust port 13 outside the battery pack. This structure also completely prevents the high-temperature, high-pressure fluid from flowing through the area below the explosion-proof valves 23 of other battery cells 2 along the path to the main exhaust port 13, preventing the high-temperature, high-pressure fluid from triggering a chain reaction of explosion-proof valves 23 of other battery cells 2, ensuring that other battery cells 2 can still operate normally without being affected, effectively controlling the thermal runaway of the battery cells 2, preventing the spread of thermal runaway, and effectively improving the operational safety of the battery pack.

[0066] In another embodiment of this application, the main exhaust port 13 is located on the side of the housing 10 in the negative direction of the first direction; the blocking member 31 is configured to allow at least a portion of the fluid ejected from the explosion-proof valve 23 to flow out from the exhaust port 314 in a set exhaust direction, and an acute angle is formed between the set exhaust direction and the negative direction of the first direction.

[0067] Because the blocking member 31 causes at least a portion of the fluid ejected from the explosion-proof valve 23 to flow out from the outlet 314 along the set exhaust direction, an acute angle is formed between the set exhaust direction and the negative direction of the first direction; that is, the corresponding set exhaust directions of the blocking member 31 can be arranged in a fishbone-like shape, the corresponding set exhaust directions of the blocking member 31 will not overlap with each other, and they are all deflected towards the direction of the total exhaust port 13. The above structure can not only completely prevent high-temperature and high-pressure fluid from flowing through the area below the explosion-proof valve 23 of other battery cells 2, but also allow at least a portion of the fluid ejected from the explosion-proof valve 23 to be discharged from the total exhaust port 13 located on the side of the housing 10 in the negative direction of the first direction as soon as possible, thereby increasing the discharge speed of at least a portion of the fluid ejected from the explosion-proof valve 23, minimizing the residence time of the high-temperature and high-pressure fluid ejected from the explosion-proof valve 23 in the exhaust space 40, thereby reducing the impact of the high-temperature and high-pressure fluid on other battery cells 2, preventing the spread of thermal runaway, and effectively improving the working safety of the battery pack.

[0068] like Figure 2 , Figure 3 and Figure 4As shown, in one embodiment of this application, the blocking member 31 further includes a bottom partition 313, and the projection of the explosion-proof valve 23 on the bottom protective plate 11 is located within the projection of the bottom partition 313 on the bottom protective plate 11. Since the blocking component 31 also includes a bottom partition 313, and the projection of the explosion-proof valve 23 on the bottom protective plate 11 is located within the projection of the bottom partition 313 on the bottom protective plate 11, when the ejected fluid or other fluid sprayed from the explosion-proof valve 23 of any battery cell 2 ruptures and sprays downwards, the bottom partition 313 can buffer the high-temperature and high-pressure fluid. At least part of the fluid sprayed from the explosion-proof valve 23 will not spray directly onto the bottom protective plate 11 of the enclosure 10, thus preventing the bottom protective plate 11 of the enclosure 10 from being deformed or even melted by the impact of at least part of the fluid sprayed from the explosion-proof valve 23, which could lead to a break in the bottom protective plate 11 of the enclosure 10. This also prevents at least part of the fluid sprayed from the explosion-proof valve 23 from breaking through the bottom protective plate 11 of the enclosure 10, which could cause a short circuit in the battery pack and its associated electrical equipment, effectively improving the working safety of the battery pack and its associated electrical equipment.

[0069] like Figure 7 As shown, in the height direction of the battery cell 2, the distance between the bottom separator 313 and the explosion-proof valve 23 is r mm, where r mm satisfies 4 mm ≤ r mm ≤ 15 mm. When the distance r mm between the bottom separator 313 and the explosion-proof valve 23 is less than 4 mm, the fluid ejected after the explosion-proof valve 23 ruptures will cause significant damage to the bottom separator 313 when it sprays downwards. This could still lead to deformation or even melting of the bottom separator 313 due to the impact of at least part of the fluid ejected from the explosion-proof valve 23. When the distance r mm between the bottom separator 313 and the explosion-proof 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.

[0070] When the distance r mm between the bottom partition 313 and the explosion-proof valve 23 satisfies 4 mm ≤ r mm ≤ 15 mm, it can be ensured that the bottom partition 313 is less impacted by at least a portion of the fluid ejected from the explosion-proof valve 23, and that the reserved space between the bottom partition 313 and the bottom protective plate 11 is sufficient to prevent deformation caused by mutual impact between the bottom partition 313 and the bottom protective plate 11, and can also effectively improve the energy density of the battery pack in this embodiment. In specific embodiments, the distance r mm between the bottom partition 313 and the explosion-proof valve 23 can be selected from specific values ​​such as 4 mm, 5 mm, 8 mm, 12 mm, 15 mm, etc., and is not limited here.

[0071] like Figure 7As shown, in one embodiment of this application, the distance between the bottom separator 313 and the bottom protective plate 11 in the height direction of the battery cell 2 is u mm, where u mm satisfies 0.5 mm ≤ u mm ≤ 5 mm. When the distance u mm between the bottom separator 313 and the bottom protective plate 11 is less than 0.5 mm, the space between them is too small. When the battery pack vibrates vertically between the bottom separator 313 and the bottom protective plate 11, they are prone to colliding with each other, leading to deformation of at least one of them after impact. When the distance u mm between the bottom separator 313 and the bottom protective plate 11 is greater than 5 mm, it tends to occupy too much space, thus reducing the energy density of the battery pack in this embodiment. When the distance u mm between the bottom separator 313 and the bottom protective plate 11 satisfies 0.5 mm ≤ u mm ≤ 5 mm, sufficient space can be reserved between the bottom separator 313 and the bottom protective plate 11 to prevent deformation due to mutual impact, and the energy density of the battery pack in this embodiment can be effectively improved. In specific embodiments, the distance u mm between the bottom separator 313 and the bottom protective plate 11 can be selected from specific values ​​such as 0.5 mm, 1 mm, 2 mm, 3 mm, and 5 mm, and is not limited here.

[0072] Specifically, in one embodiment of this application, the bottom partition 313 is fitted to the bottom protective plate 11 of the housing 10. Because the bottom partition 313 is fitted to the bottom protective plate 11 of the housing 10, the bottom protective plate 11 can support the heat exchange plate 30 through the blocking member 31, preventing the heat exchange plate 30, especially its central area, from deforming downwards due to pressure from the battery pack 20 after prolonged 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 protective plate 11, ensuring that at least a portion of the fluid ejected from the explosion-proof valve 23 is discharged outwards through the exhaust space 40 in a timely manner; and preventing contact between the main body of the heat exchange plate 30 and the bottom protective plate 11, thus avoiding wear or short circuits and improving the operational safety of the battery pack.

[0073] In one embodiment of this application, the blocking member 31 is at least one of aluminum, aluminum alloy, and steel. When the blocking member 31 is made of at least any one of aluminum, aluminum alloy, and steel, the structural strength and high-temperature resistance of the blocking member 31 can be effectively guaranteed, and the deformation or even melting of the bottom partition 313 due to the impact of at least part of the fluid ejected from the explosion-proof valve 23 can be avoided as much as possible.

[0074] like Figure 6As shown, in one embodiment of this application, the blocking member 31 includes a main partition 311 and two side partitions 312 located on both sides of the main partition 311. The main partition 311 and the two side partitions 312 together form an air outlet 314. That is, the blocking member 31 in this embodiment can be U-shaped, composed of the main partition 311 and the two side partitions 312 located on both sides of the main partition 311. The main partition 311 and the two side partitions 312 together form an air outlet 314, and the fluid ejected from the explosion-proof valve 23 can flow out from the air outlet 314 under the action of the blocking member 31. Further, as Figure 5 As shown, in one embodiment of this application, the battery cell 2 has a first side and a second side. The first side is parallel to a first direction, and the second side is parallel to a second direction. The width of the first side is smaller than the width of the second side, and the flow channel 32 is configured to extend along the second direction. That is, the first side is the smaller side of the battery cell 2, and the second side is the larger side of the battery cell 2. The heat exchange liquid in the same flow channel 32 can simultaneously exchange heat with at least two battery cells 2 arranged along the second direction. The number of battery cells 2 corresponding to the same flow channel 32 is relatively small, thereby improving the uniformity of temperature distribution inside the battery pack 20.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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 battery cells (2) arranged in a row, and an explosion-proof valve (23) is provided on the bottom surface of the battery cell (2). Heat exchange plate (30) is disposed at the bottom of the battery pack (20) and exchanges heat with the battery cell (2). The heat exchange plate (30) is provided with a through port corresponding to the position of the explosion-proof valve (23). The housing (10) is provided with a bottom guard plate (11), and an exhaust space (40) is formed between the bottom guard plate (11) and the heat exchange plate (30). Among them, a blocking member (31) is provided on the bottom surface of the heat exchange plate (30). The blocking member (31) is located at the bottom of the heat exchange plate (30) near the position corresponding to the explosion-proof valve (23), and is configured to cause at least a portion of the fluid ejected by the explosion-proof valve (23) to move away from the blocking member (31).

2. The battery pack according to claim 1, characterized in that, The blocking member (31) includes a main partition (311), which is disposed on the same side of the bottom of the heat exchange plate (30) corresponding to the explosion-proof valve (23), and at least part of the projection of the main partition (311) on the bottom guard plate (11) is located between the projections of the two explosion-proof valves (23) on the bottom guard plate (11).

3. The battery pack according to claim 2, characterized in that, The battery pack (20) includes at least one battery row (29), the battery row (29) including a plurality of battery cells (2) arranged along a first direction; the main separator (311) extends along a second direction; the second direction is perpendicular to the first direction and perpendicular to the height direction of the battery cells (2).

4. The battery pack according to claim 3, characterized in that, In the second direction, the extension length of the blocking member (31) is i mm, and the extension length of the explosion-proof valve (23) is j mm, i / j satisfying 1.2≤i / j≤1.

8.

5. The battery pack according to claim 3, characterized in that, In the second direction, the extension length i mm of the main partition (311) satisfies 35 mm ≤ i mm ≤ 85 mm.

6. The battery pack according to claim 3, characterized in that, In the second direction, the extension length j mm of the explosion-proof valve (23) satisfies 25 mm ≤ j mm ≤ 65 mm.

7. The battery pack according to claim 3, characterized in that, In the first direction, the distance between the main separator (311) and the explosion-proof valve (23) corresponding to the battery cell (2) is k mm, where k mm satisfies 3 mm ≤ k mm ≤ 15 mm.

8. The battery pack according to claim 3, characterized in that, The heat exchange plate (30) is provided with at least one flow channel (32), which extends along the second direction and is filled with heat exchange liquid to exchange heat with the battery cell (2). In the first direction, the main separator (311) is disposed between the explosion-proof valve (23) corresponding to the battery cell (2) and the flow channel (32), and the distance between the main separator (311) and the flow channel (32) is n mm, where n mm satisfies 3 mm ≤ n mm ≤ 10 mm.

9. The battery pack according to claim 3, characterized in that, The blocking member (31) also includes two side partitions (312) located on both sides of the main partition (311) to form an outlet (314) between the ends of the two side partitions (312) away from the main partition (311); the blocking member (31) is configured to allow at least a portion of the fluid ejected by the explosion-proof valve (23) to flow out from the outlet (314) in the same direction.

10. The battery pack according to claim 9, characterized in that, In the second direction, the distance between the two side partitions is p mm, where p mm satisfies 35 mm ≤ p mm ≤ 85 mm.

11. The battery pack according to claim 9, characterized in that, In the first direction, the distance of the extension length of the blocking member (31) is q mm, where q mm satisfies 14 mm ≤ q mm ≤ 40 mm.

12. The battery pack according to claim 9, characterized in that, An arc-shaped transition section is provided between the main partition (311) and the side partition (312).

13. The battery pack according to any one of claims 1 to 12, characterized in that, The battery pack (20) includes at least one battery row (29), the battery row (29) includes a plurality of battery cells (2) arranged along a first direction; the vents (314) of the blocking member (31) are all arranged facing the same side of the first direction, and the housing (10) is provided with a total exhaust port (13), the total exhaust port (13) is located on the side of the housing (10) in the negative direction of the first direction.

14. The battery pack according to claim 13, characterized in that, The battery pack (20) includes two parallel rows of batteries (29), each row of batteries (29) includes a plurality of battery cells (2) arranged along a first direction, and the two rows of batteries (29) are arranged along a second direction. The blocking element (31) is configured to cause at least a portion of the fluid ejected from the explosion-proof valve (23) corresponding to the battery cell (2) to flow out from the vent (314) in a direction away from the other battery row (29).

15. The battery pack according to claim 14, characterized in that, The blocking element (31) is configured to cause at least a portion of the fluid ejected from the explosion-proof valve (23) to flow out from the outlet (314) in the positive or negative direction of the second direction.

16. The battery pack according to claim 14, characterized in that, The housing (10) is provided with a main exhaust port (13), which is located on the side of the housing (10) in the negative direction of the first direction; The blocking member (31) is configured to allow at least a portion of the fluid ejected from the explosion-proof valve (23) to flow out from the outlet (314) along a set exhaust direction, the set exhaust direction forming an acute angle with the negative direction of the first direction.

17. The battery pack according to claim 1, characterized in that, The blocking member (31) also includes a bottom partition (313), and the projection of the explosion-proof valve (23) on the bottom guard plate (11) is located within the projection of the bottom partition (313) on the bottom guard plate (11).

18. The battery pack according to claim 17, characterized in that, In the height direction of the battery cell, the distance between the bottom partition (313) and the explosion-proof valve (23) is r mm, where r mm satisfies 4 mm ≤ r mm ≤ 15 mm.

19. The battery pack according to claim 17, characterized in that, In the height direction of the battery cell, the distance between the bottom separator (313) and the bottom protective plate (11) is u mm, where u mm satisfies 0.5 mm ≤ u mm ≤ 5 mm.

20. The battery pack according to claim 17, characterized in that, The bottom partition (313) is fitted to the bottom protective plate (11) of the box body (10).

21. The battery pack according to claim 1, characterized in that, The blocking element (31) is at least one of aluminum, aluminum alloy, and steel.

22. The battery pack according to claim 1, characterized in that, The blocking component includes a main partition (311) and two side partitions (312) located on both sides of the main partition (311), the main partition (311) and the two side partitions (312) together form an air outlet (314).

23. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 22.

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