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 at least comprises a battery group and a flow channel plate. The battery group comprises at least one battery column, and the battery column comprises a plurality of battery monomers arranged along a first direction. An explosion-proof valve is arranged on the bottom surface of the battery monomer. The flow channel plate is arranged at the bottom of the battery group and exchanges heat with the battery monomer. At least one flow channel is arranged in the flow channel plate. The flow channel comprises an avoiding section. The projection of the explosion-proof valve along a second direction is completely located in the projection of the avoiding section along the second direction. The avoiding section is used for avoiding the explosion-proof valve. The second direction is perpendicular to the first direction and perpendicular to the height direction of the battery monomer. The extension length of the explosion-proof valve along the first direction is L(0) mm. The extension length of the avoiding section along the first direction is L(1) mm. L(0) / L(1) satisfies 0.4≤L(0) / L(1)≤0.7.

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] In existing battery packs, because the explosion-proof valve occupies the bottom space of the battery cell, and the flow channel plate is also set at the bottom of the battery pack, the flow channel is difficult to arrange, which cannot guarantee the heat exchange between the battery cell and the flow channel plate. As a result, the battery cell cannot operate within the appropriate temperature range, which affects the working performance of 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 problems of existing battery packs where, due to the explosion-proof valve occupying the bottom space of the battery cell and the flow channel plate being set at the bottom of the battery pack, the flow channel is difficult to arrange, heat exchange between the battery cell and the flow channel plate cannot be guaranteed, the battery cell cannot work within a suitable temperature range, and the working performance of the battery pack is affected.

[0006] The first aspect of this application provides a battery pack, comprising: A battery pack, the battery pack including at least one battery column, the battery column including a plurality of battery cells arranged along a first direction; an explosion-proof valve is provided on the bottom surface of the battery cells; A flow channel plate is disposed at the bottom of the battery pack and is configured to exchange heat with the individual battery cells. The flow channel plate has at least one flow channel extending in a first direction and having a heat exchange liquid flowing inside it to exchange heat with the individual battery cells. The flow channel includes a clearance section, and the projection of the explosion-proof valve along the second direction is completely located within the projection of the clearance section along the second direction. The clearance section is configured to avoid the explosion-proof valve, and the second direction is perpendicular to the first direction and perpendicular to the height direction of the battery cell. The explosion-proof valve extends along the first direction for a length of L(0) mm, and the clearance section extends along the first direction for a length of L(1) mm. L(0) / L(1) satisfies 0.4≤L(0) / L(1)≤0.7.

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

[0008] In the battery pack of this application embodiment, when the ratio L(0) / L(1) of the extension length L(0) mm of the explosion-proof valve along the first direction to the extension length L(1) mm of the avoidance section along the first direction satisfies 0.4≤L(0) / L(1)≤0.7, it can limit the extension length occupied by the avoidance section, increase the heat exchange area between the flow channel and the battery cell, thereby ensuring the heat exchange efficiency between the flow channel and the battery cell, and also ensure that the avoidance section and the explosion-proof valve will not interfere with each other. The flow channel can effectively avoid the area where the explosion-proof valve is located and will not have a significant impact on the flow process of the fluid sprayed by the explosion-proof valve. 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 perspective view of the battery pack according to an embodiment of this application.

[0014] Figure 3 This is a schematic diagram of the bottom surface of the battery pack according to an embodiment of this application.

[0015] Figure 4 This is a schematic diagram of the bottom surface 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] Explanation of reference numerals in the attached figures: 10. Housing; 11. Base plate; 12. Frame; 20. Battery pack; 2. Battery cell; 23. Explosion-proof valve; 28. Battery row; 30. Flow channel plate; 32. Flow channel; 321. Avoidance section; 3211. Avoidance section; 3212. Transition section; 322. Middle section; 323. Edge section.

[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 battery group 20 and a flow channel plate 30. The battery group 20 includes at least one battery column 28, and the battery column 28 includes a plurality of battery cells 2 arranged along a first direction; an explosion-proof valve 23 is provided on the bottom surface of the battery cell 2.

[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 housing 10 and sealed with a cover, 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 plate 11 of the housing 10, separating the battery cell 2 from other components located above it, thus providing isolation.

[0023] Understandably, multiple battery cells 2 with similar capacity and internal resistance are connected in series or parallel to form a battery pack 20. Each 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 battery cell 2 includes at least a casing and a cover plate fixedly connected to each other, as well as a cell and an electrolyte. The casing and cover plate together house the cell and electrolyte. The cover plate may have at least one positive electrode post and at least one negative electrode post for electrical connection to the outside. The cell includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and a separator. 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, and one end of an adapter plate is electrically connected to the tab, while the other end is electrically connected to the post. It is understood that the battery cell 2 in this application 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 herein.

[0024] An explosion-proof valve 23 is a component or part that can be actuated to release internal pressure or temperature when the internal pressure or temperature of the 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. Because the explosion-proof valve 23 is located on the bottom surface of the battery cell 2, when the internal pressure of the battery reaches the pressure relief capacity of the explosion-proof valve 23, the explosion-proof valve 23 promptly connects to the outside and releases pressure; the ejected fluid from the explosion-proof valve 23 is discharged downwards, avoiding direct contact with electrical components above the battery cell 2, thus achieving thermoelectric separation and improving the overall safety of the battery pack.

[0025] The flow channel plate 30 is disposed at the bottom of the battery pack 20 and is configured to exchange heat with the battery cell 2; specifically, the flow channel 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.

[0026] The flow channel plate 30 is a component for regulating the temperature of the battery cell 2. The flow channel 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 battery cell 2, and then exits through the outlet, thus achieving heat exchange for the battery cell 2. The flow channel 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 flow channel 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 flow channel plate 30 can be made of metal materials, such as aluminum alloy or magnesium alloy; or it can be made of plastic.

[0027] like Figure 3 As shown, the flow channel plate 30 has at least one flow channel 32 extending along a first direction and through which a heat exchange liquid flows to exchange heat with the battery cells 2. Therefore, the flow channel plate 30 can utilize the heat exchange liquid flowing within the flow channel 32 for heat exchange, ensuring that the battery cells 2 operate within their optimal operating range. Since the flow channel 32 extends along the first direction, the heat exchange liquid within the same flow channel 32 can simultaneously exchange heat with multiple battery cells 2 arranged along the first direction, thereby ensuring the heat exchange efficiency between the flow channel plate 30 and the battery cells 2 of the battery pack 20. It is understood that the heat exchange liquid can be water, oil, an aqueous solution of ethylene glycol, etc., and is not limited thereto.

[0028] Among them, such as Figure 3 As shown, the flow channel 32 includes a clearance section 321. The projection of the explosion-proof valve 23 along the second direction is completely located within the projection of the clearance section 321 along the second direction. The clearance section 321 is configured to avoid the explosion-proof valve 23. The second direction is perpendicular to the first direction and perpendicular to the height direction of the battery cell 2. That is, the clearance section 321 completely covers the area where the explosion-proof valve 23 of the battery cell 2 is located in the extension direction.

[0029] It is understandable that, since the clearance section 321 completely covers the area where the explosion-proof valve 23 of the battery cell 2 is located in the extension direction of the flow channel 32, the explosion-proof valve 23 needs to occupy some space. Therefore, the width of the middle part of the clearance section 321 in the second direction needs to be reduced to leave room for the explosion-proof valve 23.

[0030] like Figure 3 and Figure 4As shown, in the battery pack of this application embodiment, the length of the explosion-proof valve 23 extending along the first direction is L(0) mm, the length of the clearance section 321 extending along the first direction is L(1) mm, and L(0) / L(1) / satisfies 0.4≤L(0) / L(1)≤0.7.

[0031] When the ratio L(0) / L(1) of the extension length L(0) mm of the explosion-proof valve 23 along the first direction to the extension length L(1) mm of the avoidance section 321 along the first direction is less than 0.4, the extension length occupied by the avoidance section 321 is large. Since the width of the middle part of the avoidance section 321 needs to be reduced, it will affect the heat exchange area between the flow channel 32 and the battery cell 2. When the ratio L(0) / L(1) of the extension length L(0) mm of the explosion-proof valve 23 along the first direction to the extension length L(1) mm of the avoidance section 321 along the first direction is greater than 0.7, the avoidance section 321 and the explosion-proof valve 23 are prone to mutual interference, which will cause the flow channel 32 to be unable to effectively avoid the area where the explosion-proof valve 23 is located, thereby affecting the flow process of the fluid ejected by the explosion-proof valve 23.

[0032] Therefore, when the ratio L(0) / L(1) of the extension length L(0) mm of the explosion-proof valve 23 along the first direction to the extension length L(1) mm of the avoidance section 321 along the first direction satisfies 0.4≤L(0) / L(1)≤0.7, it can limit the extension length occupied by the avoidance section 321, increase the heat exchange area between the flow channel 32 and the battery cell 2, and thus ensure the heat exchange efficiency between the flow channel 32 and the battery cell 2. It can also ensure that the avoidance section 321 and the explosion-proof valve 23 will not interfere with each other, and the flow channel 32 can effectively avoid the area where the explosion-proof valve 23 is located, and will not have a significant impact on the flow process of the fluid sprayed by the explosion-proof valve 23.

[0033] In a specific embodiment, the ratio L(0) / L(1) of the extension length L(0) mm of the explosion-proof valve 23 along the first direction to the extension length L(1) mm of the avoidance section 321 along the first direction can be selected as a specific value such as 0.4, 0.45, 0.5, 0.6, 0.7, etc., and is not limited here.

[0034] like Figure 3 and Figure 4 As shown, in one embodiment of this application, the length L(0) mm of the explosion-proof valve 23 extending along the first direction satisfies 25 mm ≤ L(0) mm ≤ 65 mm.

[0035] When the length L(0) mm of the explosion-proof valve 23 extending along the first direction 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 length L(0) mm of the explosion-proof valve 23 extending along the first direction is greater than 65 mm, it can easily affect the arrangement of the flow channel 32 or other structures of the flow channel plate 30. Therefore, when the length L(0) mm of the explosion-proof valve 23 extending along the first direction satisfies 25 mm ≤ L(0) mm ≤ 65 mm, it can ensure the overall area of ​​the explosion-proof valve 23, ensure that the exhaust pressure reduction rate of the battery cell 2 after the explosion-proof valve 23 ruptures meets the requirements, and facilitate the arrangement of the flow channel 32 or other structures of the flow channel 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 length L(0) mm of the explosion-proof valve 23 extending along the first direction can be selected from specific values ​​such as 25 mm, 35 mm, 40 mm, 50 mm, 65 mm, etc., and is not limited here.

[0036] like Figure 3 and Figure 4 As shown, in one embodiment of this application, the extension length L(1) mm of the avoidance section 321 along the first direction satisfies 41 mm ≤ L(1) mm ≤ 101 mm.

[0037] When the length L(1) mm of the avoidance section 321 extending along the first direction is less than 41 mm, the avoidance section 321 and the explosion-proof valve 23 are prone to interference, which prevents the flow channel 32 from effectively avoiding the area where the explosion-proof valve 23 is located, thus affecting the flow process of the fluid ejected by the explosion-proof valve 23. When the length L(1) mm of the avoidance section 321 extending along the first direction is greater than 101 mm, the extension length occupied by the avoidance section 321 is large. Since the width of the middle part of the avoidance section 321 needs to be reduced, it will affect the heat exchange area between the flow channel 32 and the battery cell 2.

[0038] Therefore, when the length L(1) mm of the avoidance section 321 extending along the first direction satisfies 41 mm ≤ L(1) mm ≤ 101 mm, it can be ensured that the avoidance section 321 and the explosion-proof valve 23 will not interfere with each other, and the flow channel 32 can effectively avoid the area where the explosion-proof valve 23 is located, without having a significant impact on the flow process of the fluid ejected by the explosion-proof valve 23. It can also increase the heat exchange area between the flow channel 32 and the battery cell 2, thereby ensuring the heat exchange efficiency between the flow channel 32 and the battery cell 2. In a specific embodiment, the length L(1) mm of the avoidance section 321 extending along the first direction can be selected from specific values ​​such as 41 mm, 55 mm, 70 mm, 90 mm, 101 mm, etc., and is not limited here.

[0039] like Figure 4 As shown, in one embodiment of this application, the extension length L(4) mm of the battery cell 2 along the first direction satisfies 190 mm ≤ L(4) mm ≤ 250 mm.

[0040] When the extension length L(1) mm of the battery cell 2 along the first direction is less than 190 mm, the extension length of the battery cell 2 is relatively short, and the size occupied by the non-active parts such as the casing of the battery cell 2 is large, which will reduce the energy density of the battery pack in this embodiment. When the extension length L(1) mm of the battery cell 2 along the first direction is greater than 250 mm, the structural strength and working stability of the battery cell 2 will be weakened, and the manufacturing difficulty of the battery cell 2 will also be increased. Therefore, when the extension length L(1) mm of the battery cell 2 along the first direction satisfies 190 mm ≤ L(1) mm ≤ 250 mm, the energy density of the battery pack in this embodiment can be effectively guaranteed, the structural strength and working stability of the battery cell 2 can be guaranteed, and the manufacturing difficulty of the battery cell 2 can be reduced. In specific embodiments, the extension length L(1) mm of the battery cell 2 along the first direction can be selected from specific values ​​such as 190 mm, 215 mm, 230 mm, 240 mm, 250 mm, etc., and is not limited here.

[0041] like Figure 1 and Figure 2 As shown, the battery pack in this embodiment may further include a housing 10, which forms a receiving cavity for placing the battery pack 20. The housing 10 includes a bottom plate 11 and a frame 12, and a flow channel plate 30 is disposed above the bottom plate 11.

[0042] 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.

[0043] The housing 10 may include a lower housing and an upper housing. The lower housing includes a base plate 11 and a frame 12 connected to and surrounding the base plate 11. The upper housing is connected to the frame 12 and has a cover plate opposite to the base plate 11. The upper and lower housings together form a receiving cavity. The frame 12 and the base plate 11 can be integrally formed or processed separately and then fixedly connected. Specifically, the frame 12 and the base plate 11 are fixedly connected by welding, riveting, screwing, or other methods. When the housing 10 is a cube, the frame 12 of the lower housing generally has four side plates surrounding the periphery of the base 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 base 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 housing 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.

[0044] like Figure 3 As shown, in one embodiment of this application, the outer contour of the negative side of the avoidance section 321 includes an avoidance section 3211 and two transition sections 3212 located on both sides of the avoidance section 3211; the outer contour of the positive side of the avoidance section 3211 is straight. Because the avoidance section 3211 and the two transition sections 3212 located on both sides of the avoidance section 3211, and the outer contour of the positive side of the avoidance section 3211 is straight, the flow resistance of the heat exchange liquid in the flow channel 32 during its flow along the transition sections 3212, the avoidance section 3211, and the transition sections 3212 can be effectively reduced, effectively increasing the flow velocity of the heat exchange liquid in the flow channel 32, thereby improving the heat exchange efficiency between the flow channel 32 and the battery cell 2. It is understood that the aforementioned negative and positive directions are two pointing directions of any direction; please refer to the accompanying drawings for specific directions.

[0045] Furthermore, such as Figure 3 As shown, in one embodiment of this application, the outer contour of the transition section 3212 on the negative side of the second direction is curved. Since the outer contour of the transition section 3212 on the negative side of the second direction is curved, the flow resistance of the heat exchange liquid in the flow channel 32 during the flow process along the transition section 3212 can be further reduced, thereby increasing the flow velocity of the heat exchange liquid in the flow channel 32.

[0046] like Figure 5 As shown, in one embodiment of this application, the width of the avoidance section 3211 in the second direction is D(1) mm, the maximum width of the flow channel 32 in the second direction is D(0) mm, and D(1) / D(0) satisfies 0.1≤D(1) / D(0)≤0.3.

[0047] When the ratio of the width D(1) mm of the clearance section 3211 in the second direction to the maximum width D(0) mm of the flow channel 32 in the second direction, D(1) / D(0), is less than 0.1, the width of the clearance section 3211 is too small. This not only easily affects the heat exchange efficiency between the clearance section 3211 and the bottom surface of the battery cell 2, but also, when the heat exchange liquid flows from the clearance section 3211 to the transition section 3212, in the second direction, only the heat exchange liquid on the side adjacent to the clearance section 3211 flows relatively quickly, while the liquid on the side far from the clearance section 3211 has a very low flow rate and is difficult to participate in the liquid flow exchange, thus forming a dead zone. The temperature of the heat exchange liquid in the dead zone tends to be the same as the temperature of the bottom surface of the battery cell 2, and heat is easily accumulated in the dead zone, resulting in extremely low heat exchange efficiency. When the ratio D(1) / D(0) is greater than 0.3, the width of the clearance section 3211 is too large, the width of the flow channel 32 will be restricted, which will result in the total heat exchange area between the battery cells 2 in the flow channel 32 being restricted, and will also affect the heat exchange efficiency between the flow channel 32 and the battery cells 2.

[0048] Therefore, when the ratio D(1) / D(0) of the width D(1) mm of the transition section 3212 in the second direction to the maximum width D(0) mm of the flow channel 32 in the second direction satisfies 0.1≤D(1) / D(0)≤0.3, not only can the heat exchange efficiency between the clearance section 3211 and the bottom surface of the battery cell 2 be guaranteed, but the dead zone in the transition section 3212 can also be reduced, thereby improving the heat exchange efficiency between the transition section 3212 and the bottom surface of the battery cell 2. Furthermore, the total heat exchange area between the flow channel 32 and the battery cell 2 can be effectively guaranteed, thus ensuring the overall heat exchange efficiency between the flow channel 32 and the battery cell 2. In specific embodiments, the above ratio D(1) / D(0) can be selected from specific values ​​such as 0.1, 0.15, 0.2, 0.22, 0.3, etc., and is not limited here.

[0049] like Figure 3As shown, in one embodiment of this application, the flow channel 32 further includes a middle section 322 and an edge section 323. The middle section 322 is located between two avoidance sections 321, and the projection of the middle section 322 along the second direction coincides with the projection of two adjacent battery cells 2 along the second direction. The edge section 323 is located at the entrance or exit of the flow channel 32 and is adjacent to the avoidance section 321. The projection of the edge section 323 along the second direction coincides with the projection of the battery cell 2 located at the edge of the battery row 28 along the second direction. During the operation of the battery pack in this embodiment, the heat exchange liquid in the flow channel 32 can flow in the order of edge section 323, avoidance section 321, middle section 322, avoidance section 321 and edge section 323. Compared with the avoidance section 321, the middle section 322 and edge section 323 are wider, which can effectively increase the heat exchange area between the flow channel 32 and the battery cell 2 and improve the heat exchange efficiency between the flow channel 32 and the battery cell 2.

[0050] like Figure 3 As shown, in one embodiment of this application, the outer contours of the intermediate section 322 and the edge section 323 are generally square, and their widths in the second direction are equal to the maximum width of the flow channel 32 in the second direction. Since the outer contours of the intermediate section 322 and the edge section 323 are generally square, and their widths in the second direction are equal to the maximum width of the flow channel 32 in the second direction, the widths of the intermediate section 322 and the edge section 323 can be further guaranteed to be the maximum width within limits, thereby increasing the heat exchange area between the flow channel 32 and the battery cell 2 and improving the heat exchange efficiency between the flow channel 32 and the battery cell 2.

[0051] like Figure 3 As shown, in one embodiment of this application, the negative side of the second direction of the avoidance section 321 is configured to avoid the explosion-proof valve 23 of the corresponding battery cell 2, and the outer contour of the positive side of the second direction of the flow channel 32 is straight. That is, by using only the negative side of the second direction of the avoidance section 321 to avoid the explosion-proof valve 23 of the corresponding battery cell 2, and the outer contour of the positive side of the second direction of the flow channel 32 is straight, the flow resistance of the heat exchange liquid in the flow channel 32 during the flow process along the edge section 323, the avoidance section 321, the middle section 322, the avoidance section 321 and the edge section 323 can be reduced, effectively increasing the flow velocity of the heat exchange liquid in the flow channel 32, thereby improving the heat exchange efficiency between the flow channel 32 and the battery cell 2.

[0052] like Figure 4 As shown, in one embodiment of this application, the extension length of the intermediate section 322 along the first direction is L(2) mm; the extension length of the battery cell 2 along the first direction is L(4) mm; L(2) / L(4) satisfies 0.5≤L(2) / L(4)≤0.9.

[0053] When the ratio L(2) / L(4) of the extension length L(2) mm of the intermediate section 322 along the first direction to the extension length L(4) mm of the battery cell 2 along the first direction is less than 0.5, the extension length occupied by the intermediate section 322 is small, affecting the heat exchange area between the flow channel 32 and the battery cell 2. When the ratio L(2) / L(4) is greater than 0.9, the intermediate section 322 needs to occupy a large extension length of the avoidance section 321, and the avoidance section 321 and the explosion-proof valve 23 are prone to mutual interference, which causes the flow channel 32 to be unable to effectively avoid the area where the explosion-proof valve 23 is located, thus affecting the flow process of the fluid ejected by the explosion-proof valve 23.

[0054] Therefore, when the ratio L(2) / L(4) of the extension length L(2) mm of the intermediate section 322 along the first direction to the extension length L(4) mm of the battery cell 2 along the first direction satisfies 0.5≤L(2) / L(4)≤0.9, it can ensure that the extension length occupied by the intermediate section 322 is increased, thereby improving the heat exchange area between the flow channel 32 and the battery cell 2 and ensuring the heat exchange efficiency between the flow channel 32 and the battery cell 2. At the same time, it can ensure that the avoidance section 321 and the explosion-proof valve 23 will not interfere with each other. The flow channel 32 can effectively avoid the area where the explosion-proof valve 23 is located and will not have a significant impact on the flow process of the fluid sprayed by the explosion-proof valve 23. In a specific embodiment, the above ratio L(2) / L(4) can be selected from specific values ​​such as 0.5, 0.55, 0.7, 0.8, 0.9, etc., and is not limited here.

[0055] like Figure 4 As shown, in one embodiment of this application, the extension length of the edge segment 323 along the first direction is L(3) mm; the extension length of the battery cell 2 along the first direction is L(4) mm; L(3) / L(4) satisfies 0.25≤L(3) / L(4)≤0.45.

[0056] When the ratio L(3) / L(4) of the extension length L(3) mm of the edge section 323 along the first direction to the extension length L(4) mm of the battery cell 2 along the first direction is less than 0.25, the extension length occupied by the edge section 323 is small, affecting the heat exchange area between the flow channel 32 and the battery cell 2. When the ratio L(3) / L(4) is greater than 0.45, the edge section 323 needs to occupy a large extension length of the avoidance section 321, and the avoidance section 321 and the explosion-proof valve 23 are prone to mutual interference, which causes the flow channel 32 to be unable to effectively avoid the area where the explosion-proof valve 23 is located, thus affecting the flow process of the fluid ejected by the explosion-proof valve 23. Therefore, when the ratio L(3) / L(4) of the extension length L(3) mm of the edge section 323 along the first direction to the extension length L(4) mm of the battery cell 2 along the first direction satisfies 0.25≤L(3) / L(4)≤0.45, it can ensure that the extension length occupied by the edge section 323 is increased, thereby improving the heat exchange area between the flow channel 32 and the battery cell 2 and ensuring the heat exchange efficiency between the flow channel 32 and the battery cell 2. It can also ensure that the avoidance section 321 and the explosion-proof valve 23 will not interfere with each other. The flow channel 32 can effectively avoid the area where the explosion-proof valve 23 is located and will not have a significant impact on the flow process of the fluid sprayed by the explosion-proof valve 23.

[0057] In a specific embodiment, the ratio L(3) / L(4) can be selected from specific values ​​such as 0.25, 0.255, 0.7, 0.8, 0.45, etc., and no restrictions are imposed here.

[0058] Furthermore, such as Figure 4 As shown, in one embodiment of this application, the extension length L(2) mm of the intermediate segment 322 along the first direction satisfies 100 mm ≤ L(2) mm ≤ 250 mm.

[0059] When the extension length L(2) mm of the intermediate section 322 along the first direction is less than 100 mm, the extension length occupied by the intermediate section 322 is small, affecting the heat exchange area between the flow channel 32 and the battery cell 2. When L(2) mm is greater than 250 mm, the intermediate section 322 needs to occupy a large extension length of the avoidance section 321, and the avoidance section 321 and the explosion-proof valve 23 are prone to mutual interference, which causes the flow channel 32 to be unable to effectively avoid the area where the explosion-proof valve 23 is located, thereby affecting the flow process of the fluid ejected by the explosion-proof valve 23. Therefore, when the extension length L(2) mm of the intermediate section 322 along the first direction satisfies 100 mm ≤ L(2) mm ≤ 250 mm, the intermediate section 322 needs to occupy a large extension length of the avoidance section 321. The avoidance section 321 and the explosion-proof valve 23 are prone to mutual interference, which results in the flow channel 32 being unable to effectively avoid the area where the explosion-proof valve 23 is located, thereby affecting the flow process of the fluid ejected by the explosion-proof valve 23. In a specific embodiment, the extension length L(2) mm of the intermediate section 322 along the first direction can be selected from specific values ​​such as 100 mm, 120 mm, 150 mm, 210 mm, 250 mm, etc., and is not limited here.

[0060] Furthermore, such as Figure 4 As shown, in one embodiment of this application, the extension length L(3) mm of the edge segment 323 along the first direction satisfies 50 mm ≤ L(3) mm ≤ 125 mm.

[0061] When the extension length L(3) mm of the edge section 323 along the first direction is less than 50 mm, the extension length occupied by the edge section 323 is small, affecting the heat exchange area between the flow channel 32 and the battery cell 2. When L(3) mm is greater than 125 mm, the edge section 323 needs to occupy a large extension length of the avoidance section 321, and the avoidance section 321 and the explosion-proof valve 23 are prone to mutual interference, which causes the flow channel 32 to be unable to effectively avoid the area where the explosion-proof valve 23 is located, thereby affecting the flow process of the fluid ejected by the explosion-proof valve 23.

[0062] Therefore, when the extension length L(3) mm of the edge section 323 along the first direction satisfies 50 mm ≤ L(3) mm ≤ 125 mm, it can ensure that the extension length occupied by the edge section 323 is sufficient to increase the heat exchange area between the flow channel 32 and the battery cell 2, thereby ensuring the heat exchange efficiency between the flow channel 32 and the battery cell 2. At the same time, it can ensure that the avoidance section 321 and the explosion-proof valve 23 will not interfere with each other. The flow channel 32 can effectively avoid the area where the explosion-proof valve 23 is located, and will not have a significant impact on the flow process of the fluid sprayed by the explosion-proof valve 23. In a specific embodiment, the extension length L(3) mm of the edge section 323 along the first direction can be selected from specific values ​​such as 50 mm, 70 mm, 100 mm, 110 mm, 125 mm, etc., and is not limited here.

[0063] like Figure 5 As shown, in one embodiment of this application, the width of the battery cell 2 in the second direction is D(4) mm, the maximum width of the flow channel 32 in the second direction is D(0) mm, and D(4) / D(0) satisfies 0.8≤D(4) / D(0)≤1.2.

[0064] When the ratio D(4) / D(0) of the width D(4) mm of the battery cell 2 in the second direction to the maximum width D(0) mm of the flow channel 32 in the second direction is less than 0.8, the volume occupied by the battery cell 2 in the battery pack will be reduced, thereby reducing the energy density of the battery pack in this embodiment. When the ratio D(4) / D(0) is greater than 1.2, the area that the flow channel 32 can cover on the bottom surface of the battery cell 2 is too small, which affects the heat exchange effect of the flow channel 32 on the battery cell 2 and may easily lead to dangerous situations such as abnormal temperature rise of the battery cell 2.

[0065] Therefore, when the ratio D(4) / D(0) of the width D(4) mm of the battery cell 2 in the second direction to the maximum width D(0) mm of the flow channel 32 in the second direction satisfies 0.8≤D(4) / D(0)≤1.2, the volume occupied by the battery cell 2 in the battery pack can be effectively guaranteed, improving the energy density of the battery pack in this embodiment, while also ensuring that the flow channel 32 can cover the area of ​​the bottom surface of the battery cell 2, thus improving the working safety of the battery pack in this embodiment. In specific embodiments, the ratio D(4) / D(0) of the width D(4) mm of the battery cell 2 in the second direction to the maximum width D(0) mm of the flow channel 32 in the second direction can be selected from specific values ​​such as 0.8, 0.9, 0.95, 1, 1.1, 1.2, etc., and is not limited here.

[0066] Specifically, such as Figure 5As shown, in one embodiment of this application, the width D(4) mm of the battery cell 2 in the second direction satisfies 30 mm ≤ D(4) mm ≤ 55 mm. When the width D(4) mm of the battery cell 2 in the second direction is less than 30 mm, the width of the battery cell 2 is small, and the size occupied by the non-active parts such as the casing of the battery cell 2 is large, which will reduce the energy density of the battery pack in this embodiment of the application. When the width D(4) mm of the battery cell 2 in the second direction is greater than 50 mm, it will weaken the structural strength and working stability of the battery cell 2, and also increase the manufacturing difficulty of the battery cell 2. Therefore, when the width D(4) mm of the battery cell 2 in the second direction satisfies 30 mm ≤ D(4) mm ≤ 55 mm, the energy density of the battery pack in this embodiment of the application can be effectively guaranteed, as well as the structural strength and working stability of the battery cell 2, and the manufacturing difficulty of the battery cell 2 can be reduced. In specific embodiments, the width D(4) mm of the battery cell 2 in the second direction can be selected from specific values ​​such as 30 mm, 36 mm, 40 mm, 50 mm, 55 mm, etc., and is not limited here.

[0067] like Figure 5 As shown, in one embodiment of this application, the maximum width D(0) mm of the flow channel 32 in the second direction satisfies 28 mm ≤ D(0) mm ≤ 53 mm. When the width D(0) mm of the flow channel 32 in the second direction is less than 28 mm, the heat exchange area between the flow channel 32 and the battery cell 2 is reduced, thereby reducing the heat exchange efficiency between the flow channel 32 and the battery cell 2. When the width D(0) mm of the flow channel 32 in the second direction is greater than 50 mm, the volume occupied by the battery cell 2 in the battery pack is reduced, thereby reducing the energy density of the battery pack in this embodiment of the application. Therefore, when the width D(0) mm of the flow channel 32 in the second direction satisfies 28 mm ≤ D(0) mm ≤ 53 mm, the heat exchange area between the flow channel 32 and the battery cell 2 can be guaranteed, thereby guaranteeing the heat exchange efficiency between the flow channel 32 and the battery cell 2, and the volume occupied by the battery cell 2 in the battery pack can also be effectively guaranteed, thereby improving the energy density of the battery pack in this embodiment of the application. In a specific embodiment, the width D(0) mm of the flow channel 32 in the second direction can be selected from specific values ​​such as 28 mm, 36 mm, 40 mm, 50 mm, 53 mm, etc., and is not limited here.

[0068] like Figure 5As shown, in one embodiment of this application, the minimum spacing between adjacent flow channels 32 in the second direction is D(5) mm, where D(5) mm satisfies 3 mm ≤ D(5) mm ≤ 10 mm. When the minimum spacing D(5) mm between adjacent flow channels 32 in the second direction is less than 3 mm, the processing difficulty of the flow channel plate 30 will increase, and the processing yield of the flow channel plate 30 will decrease. When the minimum spacing D(5) mm between adjacent flow channels 32 in the second direction is greater than 10 mm, it will affect the overall area of ​​the flow channels 32 on the flow channel plate 30, thereby reducing the heat exchange area between the flow channels 32 and the battery cell 2, and thus reducing the heat exchange efficiency between the flow channels 32 and the battery cell 2.

[0069] Therefore, when the minimum spacing D(5) mm between adjacent flow channels 32 in the second direction satisfies 3 mm ≤ D(5) mm ≤ 10 mm, the processing yield of the flow channel plate 30 can be guaranteed while ensuring the overall area of ​​the flow channel 32, thereby ensuring the heat exchange efficiency between the flow channel 32 and the battery cell 2. In a specific embodiment, the minimum spacing D(5) mm between adjacent flow channels 32 in the second direction can be selected from specific values ​​such as 3 mm, 4 mm, 6 mm, 8 mm, and 10 mm, and is not limited here.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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 at least one battery column (28), the battery column (28) includes a plurality of battery cells (2) arranged along a first direction; an explosion-proof valve (23) is provided on the bottom surface of the battery cell (2). A flow channel plate (30) is disposed at the bottom of the battery pack (20) and configured to exchange heat with the battery cell (2). The flow channel plate (30) has at least one flow channel (32) extending in a first direction and having heat exchange liquid flowing inside it to exchange heat with the battery cell (2). The flow channel (32) includes a clearance section (321), the projection of the explosion-proof valve (23) along the second direction is completely located within the projection of the clearance section (321) along the second direction, the clearance section (321) is configured to clearance the explosion-proof valve, the second direction is perpendicular to the first direction and perpendicular to the height direction of the battery cell (2); The explosion-proof valve (23) extends along the first direction for a length of L(0) mm, and the clearance section (321) extends along the first direction for a length of L(1) mm. L(0) / L(1) / L(0) satisfies 0.4≤L(0) / L(1)≤0.

7.

2. The battery pack according to claim 1, characterized in that, The length L(0) mm of the explosion-proof valve (23) extending along the first direction satisfies 25 mm ≤ L(0) mm ≤ 65 mm.

3. The battery pack according to claim 2, characterized in that, The extension length L(1) mm of the avoidance section (321) along the first direction satisfies 41 mm ≤ L(1) mm ≤ 101 mm.

4. The battery pack according to claim 1, characterized in that, The extension length L(4) mm of the battery cell (2) along the first direction satisfies 190 mm ≤ L(4) mm ≤ 250 mm.

5. The battery pack according to claim 1, characterized in that, The outer contour of the second negative direction side of the avoidance section (321) includes the avoidance section (3211) and two transition sections (3212) located on both sides of the avoidance section (3211). The outer contour of the avoidance section (3211) on the positive side of the second direction is straight.

6. The battery pack according to claim 5, characterized in that, The outer contour of the transition section (3212) on the negative side of the second direction is curved.

7. The battery pack according to claim 6, characterized in that, The width of the avoidance section (3211) in the second direction is D(1) mm, and the maximum width of the flow channel (32) in the second direction is D(0) mm. D(1) / D(0) satisfies 0.1≤D(1) / D(0)≤0.

3.

8. The battery pack according to claim 1, characterized in that, The flow channel (32) further includes a middle section (322) and an edge section (323). The middle section (322) is located between two of the avoidance sections (321). The projection of the middle section (322) along the second direction coincides with the projection of the two adjacent battery cells (2) along the second direction. The edge section (323) is located at the entrance or exit of the flow channel (32) and is adjacent to the avoidance section (321); the projection of the edge section (323) along the second direction coincides with the projection of the battery cell (2) located at the edge of the battery array (28) along the second direction.

9. The battery pack according to claim 8, characterized in that, The outer contours of the middle section (322) and the edge section (323) are generally square, and their widths in the second direction are equal to the maximum width of the flow channel in the second direction.

10. The battery pack according to claim 8, characterized in that, The negative side of the avoidance section (321) is configured to avoid the explosion-proof valve (23) of the corresponding battery cell (2); the outer contour of the positive side of the flow channel is straight.

11. The battery pack according to claim 8, characterized in that, The extension length of the intermediate section (322) along the first direction is L(2) mm; the extension length of the battery cell (2) along the first direction is L(4) mm; L(2) / L(4) satisfies 0.5≤L(2) / L(4)≤0.

9.

12. The battery pack according to claim 8, characterized in that, The edge segment (323) extends along the first direction for a length of L(3) mm; the battery cell (2) extends along the first direction for a length of L(4) mm; L(3) / L(4) satisfies 0.25≤L(3) / L(4)≤0.

45.

13. The battery pack according to claim 8, characterized in that, The extension length L(2) mm of the intermediate section (322) along the first direction satisfies 100 mm ≤ L(2) mm ≤ 250 mm.

14. The battery pack according to claim 8, characterized in that, The extension length L(3) mm of the edge segment (323) along the first direction satisfies 50 mm ≤ L(3) mm ≤ 125 mm.

15. The battery pack according to claim 1, characterized in that, The width of the battery cell (2) in the second direction is D(4) mm, and the maximum width of the flow channel (32) in the second direction is D(0) mm. D(4) / D(0) satisfies 0.8≤D(4) / D(0)≤1.

2.

16. The battery pack according to claim 15, characterized in that, The width D(4) mm of the battery cell (2) in the second direction satisfies 30 mm ≤ D(4) mm ≤ 55 mm.

17. The battery pack according to claim 15, characterized in that, The maximum width D(0) mm of the flow channel (32) in the second direction satisfies 28 mm ≤ D(0) mm ≤ 53 mm.

18. The battery pack according to claim 1, characterized in that, The minimum spacing between adjacent flow channels in the second direction is D(5) mm, where D(5) mm satisfies 3 mm ≤ D(5) 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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