Battery pack and electric device

Abstract

The present application relates to a battery pack and an electric device. The battery pack comprises a box body, an isolation assembly and a plurality of battery cells, wherein the isolation assembly is arranged in the box body and forms an accommodating cavity and a flow guide channel in the box body. Since an end of each battery cell provided with an explosion-proof valve is attached to an inner wall of the accommodating cavity, a gap does not exist between an edge of the explosion-proof valve and the inner wall of the accommodating cavity. Thus, when the battery cells are subjected to thermal runaway and then the explosion-proof valves are opened, high-temperature and high-pressure substances ejected from the explosion-proof valves are directly sprayed into flow guide holes and enter the flow guide channel without spreading into the accommodating cavity. Moreover, the isolation assembly can effectively separate the accommodating cavity from the flow guide channel, and finally, the high-temperature and high-pressure substances entering the flow guide channel are directionally discharged from exhaust holes and are less prone to flowing back to the accommodating cavity. Hence, when some of the battery cells are subjected to thermal runaway, other battery cells are less affected, and thus the whole battery pack can be effectively prevented from being subjected to thermal runaway, thereby improving the safety performance.

Description

Battery packs and power devices Technical Field

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

[0002] With the rapid development of new energy, demands for the safety performance of power batteries are becoming increasingly stringent. Power batteries generate significant heat during rapid charging. Improper thermal management can cause overheating, which can impact performance at best and even lead to thermal runaway. Furthermore, thermal runaway can occur when the battery is overcharged, over-discharged, short-circuited, or collided. When thermal runaway occurs, the explosion-proof valve opens, ejecting a large amount of high-temperature, high-pressure material. Power batteries are typically placed under the vehicle's floor, beneath the driver and passengers. If high-temperature, high-pressure material is not discharged promptly or improperly, it poses a significant safety threat to the driver and passengers.

[0003] Application Contents

[0004] Based on this, it is necessary to provide a battery pack and an electrical device that can improve safety performance in order to address the above problems.

[0005] A battery pack, comprising:

[0006] The box body has an exhaust hole;

[0007] an isolation assembly disposed in the box body and forming a receiving cavity and a guide channel inside the box body, wherein the guide channel is connected to the exhaust hole, and the isolation assembly is formed with a plurality of guide holes connecting the receiving cavity and the guide channel; and

[0008] Multiple battery cells are accommodated in the accommodating cavity and are arranged one-to-one corresponding to the multiple diversion holes. Each battery cell is provided with an explosion-proof valve, and one end of each battery cell provided with the explosion-proof valve is in contact with the inner wall of the accommodating cavity, and the explosion-proof valve is directed toward the corresponding diversion hole.

[0009] In one embodiment, the box body includes a top wall, a bottom wall arranged opposite to the top wall, and a ring wall connecting the top wall and the bottom wall, and the exhaust hole is opened in the ring wall.

[0010] In one embodiment, the guide channel is formed in the middle of the box body and extends along the first direction, the accommodating cavity is distributed on both sides of the guide channel in the second direction, the second direction is perpendicular to the first direction, and each battery cell is provided with a pole at one end away from the explosion-proof valve.

[0011] In one embodiment, the accommodating chamber and the guide channel are both formed in plurality, and the plurality of accommodating chambers and the plurality of guide channels are arranged in one-to-one correspondence, and the accommodating chamber is connected to the corresponding guide channel through the guide hole.

[0012] In one embodiment, the isolation assembly includes a cooling plate, and the cooling plate constitutes the guide channel and at least one side wall of the accommodating cavity.

[0013] In one embodiment, the cooling plate includes a first cooling plate and a second cooling plate, and the two second cooling plates are arranged on the same side of the first cooling plate relative to each other. The two second cooling plates, the first cooling plate and the inner wall of the box together form the guide channel, and the guide hole is opened on the second cooling plate; each second cooling plate, the first cooling plate and the inner wall of the box together form the accommodating cavity.

[0014] In one embodiment, the first cooling plate is suspended in the box, and two second cooling plates are provided on opposite sides of the first cooling plate to form the accommodating cavity and the guide channel on opposite sides of the first cooling plate.

[0015] In one embodiment, the isolation assembly further includes a partition plate, and the partition plate is disposed between two opposite second cooling plates located on the same side of the first cooling plate.

[0016] In one embodiment, a thermally conductive adhesive layer is further included. The thermally conductive adhesive layer is disposed in the accommodating cavity and is clamped between the battery cell and the cooling plate.

[0017] In one embodiment, a sealing ring is provided along the circumference of the explosion-proof valve.

[0018] In one embodiment, the battery cell is a rectangular lithium-ion battery. In one embodiment, a phase change heat absorption structure is provided in the flow guide channel.

[0019] In one embodiment, the phase change temperature of the phase change material constituting the phase change heat absorption structure is 50°C to 55°C.

[0020] In one embodiment, the phase change material constituting the phase change heat absorption structure is paraffin.

[0021] In one embodiment, the phase change material constituting the phase change heat absorption structure is coated on the inner wall of the guide channel.

[0022] An electrical device comprises a battery pack as described in any one of the preferred embodiments above.

[0023] In one embodiment, the power-consuming device is a new energy vehicle, and the battery pack is disposed at the bottom of the new energy vehicle.

[0024] In the above-mentioned battery pack and electrical device, since one end of the explosion-proof valve of the battery cell is in contact with the inner wall of the accommodating cavity, there is no gap between the edge of the explosion-proof valve and the inner wall of the accommodating cavity. Therefore, when the battery cell experiences thermal runaway and causes the explosion-proof valve to open, the high-temperature and high-pressure substances ejected from the explosion-proof valve will be directly sprayed into the diversion hole and enter the diversion channel without spreading into the accommodating cavity. Moreover, the isolation component can effectively separate the accommodating cavity from the diversion channel, and the high-temperature and high-pressure substances that enter the diversion channel are eventually discharged in a direction from the exhaust hole and are not easily refluxed into the accommodating cavity. It can be seen that when some battery cells experience thermal runaway, other battery cells are less affected, so it can effectively prevent the entire battery pack from thermal runaway, thereby improving safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] FIG1 is a schematic structural diagram of a battery pack in a preferred embodiment of the present application;

[0027] FIG2 is an exploded view of the battery pack shown in FIG1 ;

[0028] FIG3 is a schematic structural diagram of the battery pack shown in FIG1 with the upper cover omitted;

[0029] FIG4 is a schematic structural diagram of a battery cell in the battery pack shown in FIG1 . DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0033] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0034] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0036] Please refer to FIG. 1 . The present application discloses an electrical device and a battery pack 10 . The electrical device includes the battery pack 10 and can be provided with electrical energy by the battery pack 10 .

[0037] The above-mentioned electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, bungee jumping machines, etc. This application does not impose any special restrictions on the above-mentioned electrical devices.

[0038] For new energy vehicles, the battery pack 10 can be used as a driving power source, thereby replacing fossil fuels to provide driving power.

[0039] Please refer to FIG. 2 and FIG. 3 together. The battery pack 10 in the preferred embodiment of the present application includes a box 100 , an isolation assembly 200 and a battery cell 300 .

[0040] The box body 100 has a storage space inside for accommodating the isolation assembly 200 and the battery cell 300. The outer contour of the box body 100 can be a rectangular shape or other shapes, which can be adapted to the electrical device used. Furthermore, the box body 100 has an exhaust hole 121. When the battery cell 300 inside the box body 100 undergoes thermal runaway, the high-temperature and high-pressure substances generated can be discharged outward from the exhaust hole 121 to maintain the pressure inside the box body 100 stable and avoid the explosion of the box body 100 as a whole. In addition, valve components such as an exhaust valve and a safety valve can also be provided on the exhaust hole 121.

[0041] In this embodiment, the housing 100 includes a top wall (not labeled), a bottom wall disposed opposite the top wall, and an annular wall (not labeled) connecting the top wall (not labeled) and the bottom wall, and the vent 121 is provided in the annular wall. The top wall and the bottom wall are disposed opposite each other along the height direction of the housing 100. When the battery pack 10 is installed in an electrical device, such as a new energy vehicle, the battery pack 10 is disposed at the bottom of the new energy vehicle, with the top wall of the housing 100 facing upward and the bottom wall facing downward, while the annular wall faces the side. The vent 121 is provided in the annular wall so that high-temperature and high-pressure substances can be ejected from the side of the housing 100, thereby preventing the high-temperature and high-pressure substances from directly impacting the driver and passengers.

[0042] More specifically, in this embodiment, the housing 100 includes a base plate 110 and a top cover 120. The top cover 120 is snap-fitted to the base plate 110 and removably connected to the base plate 110 via threaded fasteners. This facilitates access to the interior of the battery pack 10. The top cover 120 is a box-like structure with one side open. Its top wall forms the top wall of the housing 100, and its side walls form the surrounding walls of the housing 100.

[0043] The isolation assembly 200 is disposed within the housing 100 and defines a receiving chamber 101 and a flow channel 102 within the housing 100. The flow channel 102 communicates with the exhaust holes 121, and the isolation assembly 200 is formed with a plurality of flow channels 103 connecting the receiving chamber 101 and the flow channel 102. It should be noted that the receiving chamber 101 and the flow channel 102 are connected only through the exhaust holes 121; the other locations are isolated from each other.

[0044] Multiple battery cells 300 are provided, and their number is the same as the number of diversion holes 103. For example, if the accommodating cavity 101 and the diversion channel 102 are connected through 24 exhaust holes 121, then there are 24 battery cells 300. The battery cells 300 can be lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and their outer contours can be cylindrical, flat, rectangular, or other shapes, but are not limited to these.

[0045] The battery pack 10 generally also includes a battery management system (BMS). The multiple battery cells 300 can be electrically connected in series, parallel, or a mixture of series and parallel, and communicate with the battery management system. The above-mentioned battery management system controls and monitors the working status of each battery cell 300. In addition, the multiple battery cells 300 can also be connected in series and / or in parallel first, and form a battery module with the module management system. Then, the multiple battery modules are electrically connected in series, parallel, or a mixture of series and parallel, and together with the battery management system, form a battery pack 10. The battery cells 300 and the battery cells 300 and the battery management system can be electrically connected through a busbar.

[0046] Referring also to Figure 4 , each battery cell 300 includes a housing (not shown) and a cell assembly (not shown) housed within the housing. Each battery cell 300 is equipped with an explosion-proof valve 310 . The explosion-proof valve 310 is mounted within the housing of the battery cell 300 . When thermal runaway occurs within the battery cell 300 , the explosion-proof valve 310 opens, allowing high-temperature, high-pressure materials to be ejected from the housing.

[0047] In order to improve the space utilization rate in the box 100, the battery cell 300 in this embodiment is a rectangular lithium battery. The battery cell 300 has four side surfaces and two top surfaces, and the explosion-proof valve 310 is disposed on one of the top surfaces.

[0048] A plurality of battery cells 300 are housed in the accommodating chamber 101 and are arranged in a one-to-one correspondence with a plurality of flow guide holes 103. Furthermore, each battery cell 300 is provided with an explosion-proof valve 310, one end of which is in contact with the inner wall of the accommodating chamber 101, and the explosion-proof valve 310 is oriented toward the corresponding flow guide hole 103. The diameter of the flow guide hole 102 is slightly larger than the diameter of the explosion-proof valve 310, so the entire explosion-proof valve 310 is located within the range of the flow guide hole 102. The battery cells 300 are in contact with the inner wall of the accommodating chamber 101, so that there is no gap between the edge of the explosion-proof valve 310 and the inner wall of the accommodating chamber 101. Therefore, when a battery cell 300 experiences thermal runaway and causes the explosion-proof valve 310 to open, the high-temperature and high-pressure material ejected from the explosion-proof valve 310 will be directly sprayed into the flow guide hole 103 and enter the flow guide channel 102, without spreading into the accommodating chamber 101.

[0049] It should be noted that, in order to further avoid a gap between the edge of the explosion-proof valve 310 and the inner wall of the accommodating chamber 101 , a sealing ring (not shown) may be provided along the circumference of the explosion-proof valve 310 .

[0050] After entering the diversion channel 102, the high-temperature, high-pressure material is ultimately discharged outward through the vents 121, thereby achieving a targeted discharge of the high-temperature, high-pressure material. Because the accommodating chamber 101 and the diversion channel 102 are separated except for the diversion holes 103, the high-temperature, high-pressure material that enters the diversion channel 102 is unlikely to flow back into the accommodating chamber 101. This indicates that when thermal runaway occurs in some battery cells 300 within the battery pack 10, the other battery cells 300 are less affected, effectively preventing thermal runaway of the entire battery pack 10 and improving safety.

[0051] In this embodiment, the guide channel 102 is formed in the middle of the box body 100 and extends along the first direction. The accommodating cavity 101 is distributed on both sides of the guide channel 102 in the second direction. The second direction is perpendicular to the first direction. Each battery cell 300 is provided with a pole 320 at one end away from the explosion-proof valve 310.

[0052] The first direction can be the width of the housing 100, while the second direction can be the length of the housing 100. Of course, the first and second directions can also be reversed. Placing the flow channel 102 in the center of the housing 100 and the battery cells 300 on either side of the flow channel 102 creates a rational layout that improves space utilization within the housing 100. Furthermore, the flow channel 102 has a relatively short path, enabling rapid drainage of high-temperature, high-pressure materials ejected from each battery cell 300.

[0053] The terminal post 320 is used to connect to components such as the busbar, thereby achieving electrical connections between the battery cells 300 and between the battery cells 200 and other components. Positioning the terminal post 320 at the end of the battery cell 300 away from the explosion-proof valve 310 allows the terminal post 320 of each battery cell 300 to face outward, facilitating connection operations.

[0054] Furthermore, the flow channel 102 and the accommodating cavity 101 do not overlap in the height direction of the housing 100, and the battery cells 300 are placed flat in the accommodating cavity 101. Therefore, the height dimension of the housing 100 can be significantly reduced, thereby reducing the height of the battery pack 10 and improving the volumetric capacity density of the battery pack 10. When used in new energy vehicles, this battery pack 10 is beneficial for both improving and utilizing the overall vehicle space.

[0055] In this embodiment, a plurality of accommodating cavities 101 and a plurality of guiding channels 102 are formed, and the plurality of accommodating cavities 101 and the plurality of guiding channels 102 are arranged in a one-to-one correspondence. The accommodating cavities 101 are connected to the corresponding guiding channels 102 through the guiding holes 103 .

[0056] The multiple accommodating chambers 101 are not interconnected, and the multiple flow channels 102 are also not interconnected. The multiple battery cells 300 are distributed across the multiple accommodating chambers 101. For example, 24 battery cells 300 are respectively disposed within four accommodating chambers 101. If a battery cell 300 within one of the accommodating chambers 101 experiences thermal runaway, the ejected high-temperature, high-pressure material will only be discharged through the corresponding flow channel 102 to the exterior of the housing 100 and will not enter other flow channels 102. This minimizes the impact on the battery cells 300 within other accommodating chambers 101.

[0057] Please refer to FIG. 2 again. In this embodiment, the isolation assembly 200 includes a cooling plate 210 . The cooling plate 210 constitutes at least one sidewall of the guiding channel 102 and the accommodating cavity 101 .

[0058] The cooling plate 210 may be provided with a cooling channel (not shown) within the cooling plate 210 and an inlet and outlet (not shown) communicating with the cooling channel. The inlet and outlet are located outside the housing 100. Coolant or cooling gas can circulate within the cooling channel through the inlet and outlet, removing heat from the housing 100 to cool the battery cells 300. Because the cooling plate 210 forms at least one sidewall of the accommodating cavity 101, the battery cells 300 can directly exchange heat with the cooling plate 210, thereby improving the cooling effect on the battery cells 300.

[0059] Furthermore, because the cooling plate 210 also forms at least one sidewall of the flow channel 102, it can directly exchange heat with the high-temperature, high-pressure material entering the flow channel 102, thereby cooling it. This allows the temperature of the high-temperature, high-pressure material to be reduced to a certain extent before it is discharged through the vent 121, further preventing adverse effects on other battery cells 300. Furthermore, once the temperature of the high-temperature, high-pressure material is discharged through the vent 121, it is less likely to cause subsequent chain reactions such as fire or explosion.

[0060] In addition, in this embodiment, the battery pack 10 further includes a thermally conductive adhesive layer 500, which is disposed within the accommodating cavity 101 and sandwiched between the battery cells 300 and the cooling plate 210. The thermally conductive adhesive layer 500 can improve the heat exchange efficiency between the battery cells 300 and the cooling plate 210, thereby further improving the cooling effect on the battery cells 300.

[0061] Furthermore, in this embodiment, the cooling plate 210 includes a first cooling plate 211 and a second cooling plate 212. The two second cooling plates 212 are disposed opposite each other on the same side of the first cooling plate 210. The two second cooling plates 212, the inner wall of the housing 100, and the first cooling plate 211 collectively form a flow channel 102. The flow holes 103 are defined in the second cooling plates 212. Each second cooling plate 212, the inner wall of the housing 100, and the first cooling plate 211 collectively form a receiving chamber 101.

[0062] The first cooling plate 211 is positioned approximately perpendicular to the height of the housing 100, and the second cooling plate 212 is positioned approximately perpendicular to the first cooling plate 211. As can be seen, the flow channel 102 can extend along the length or width of the housing 100, and two accommodating cavities 101 can be formed on one side of the first cooling plate 211, with the two accommodating cavities 101 located on opposite sides of the width of the flow channel 102. Cooling channels can be provided in both the first cooling plate 211 and the second cooling plate 212, and the cooling channels of the two cooling plates can be interconnected.

[0063] The first cooling plate 211 and the second cooling plate 212 can constitute the side walls of the guide channel 102 and the side walls of the accommodating cavity 101. In other words, at least two side walls of the accommodating cavity 101 and the guide channel 102 will be formed by the cooling plate 210. The first cooling plate 211 and the second cooling plate 212 can not only structurally isolate the accommodating cavity 101 from the guide channel 102, but also dissipate heat from the battery cells 300. They can also exchange heat with the high-temperature and high-pressure materials in the battery cells 300 and the guide channel 102. Therefore, the cooling plate 210 can improve the heat dissipation effect of the accommodating cavity 101 and the guide channel 102 without adding additional structures. At the same time, the structural reuse of the cooling plate 210 simplifies the volume of the heat dissipation structure, leaving more structure to accommodate the battery cells 300, thereby increasing the space occupancy rate of the battery cells 300 in the accommodating cavity 101 and thereby increasing the energy density of the battery pack.

[0064] In this embodiment, a phase-change heat-absorbing structure (not shown) is provided within the flow channel 102. Specifically, the phase-change heat-absorbing structure can be formed from a phase-change heat-absorbing material such as paraffin wax. When high-temperature, high-pressure substances enter the flow channel 102, the phase-change heat-absorbing structure absorbs heat and undergoes a phase change, thereby preventing a sudden temperature rise in the cooling plate 210 that constitutes the flow channel 102 and thereby affecting the heat dissipation of the battery cells 300 that are also in thermal contact with the cooling plate 210. This prevents the high-temperature, high-pressure substances from causing a temperature rise in other battery cells 300, leading to a chain reaction.

[0065] More preferably, in this embodiment, the phase change temperature of the phase-change endothermic material is higher than the normal operating temperature of the battery cell 300 (approximately 35°C-45°C), but lower than the temperature of high-temperature, high-pressure materials (approximately 500°C-600°C). Thus, when the battery pack 10 is operating normally, the phase-change endothermic material remains in a state where it does not release latent heat. Only when the battery pack 10 experiences thermal runaway does the latent heat of the phase change be released, thus providing a cooling effect.

[0066] More preferably, the phase change temperature of the phase change material is preferably set to 50°C-55°C, which is slightly higher than the normal operating temperature of the battery cell 300. Therefore, when the high-temperature and high-pressure material is ejected, the phase change material will participate in the phase change and absorb heat in only a very short time. During the phase change and heat absorption process of the phase change material, the temperature can always be controlled near the phase change temperature, further avoiding the chain reaction caused by the high-temperature and high-pressure material increasing the temperature of the battery cell 300.

[0067] In this embodiment, the phase change material is preferably coated on the inner wall of the guide channel 102. In this way, when thermal runaway occurs and the heat in the heat conduction channel 102 spreads from the out-of-control position to the surrounding area, the heat absorption effect of the phase change material can greatly reduce the heat spread speed in the heat conduction channel 102, further reducing the probability of a chain reaction.

[0068] Moreover, since the first cooling plate 211 extends to the accommodating cavity 101 on both sides of the guide channel 102, and the second cooling plate 212 can also transfer the heat of the battery cell 300 to the first cooling plate 212, the cooling plate 210 can also play a role in heat equalization, thereby making the temperature of the battery cell 300 in the accommodating cavity 101 on both sides of the guide channel 102 tend to be consistent.

[0069] Furthermore, in this embodiment, the first cooling plate 211 is suspended in the box 100 , and two second cooling plates 212 are provided on opposite sides of the first cooling plate 211 to form a receiving cavity 101 and a guide channel 102 on opposite sides of the first cooling plate 211 .

[0070] In other words, the isolation assembly 200 can form two layers of accommodating cavities 101 in the height direction of the box 100, and the guide channels 102 are formed on opposite sides of the first cooling plate 211. In this way, the multiple battery cells 300 are stacked in two layers in the box 100, so the space utilization rate is higher.

[0071] Furthermore, in this embodiment, the isolation assembly 200 further includes a partition plate 220 . The partition plate 220 is disposed between two opposite second cooling plates 212 located on the same side of the first cooling plate 211 .

[0072] The partition 220 can divide the flow diversion channel 102 into two, thereby separating one flow diversion channel 102 into two independent flow diversion channels 102. When the battery cell 300 in the accommodating cavity 101 on one side experiences thermal runaway, the high-temperature and high-pressure material ejected from the diversion hole 103 can be blocked by the partition 220, thereby preventing the high-temperature and high-pressure material from affecting the battery cell 300 in the accommodating cavity 101 on the other side.

[0073] In the aforementioned battery pack 10 and electrical device, because one end of the explosion-proof valve 310 provided on each battery cell 300 abuts against the inner wall of the accommodating chamber 101, there is no gap between the edge of the explosion-proof valve 310 and the inner wall of the accommodating chamber 101. Therefore, when a battery cell 300 experiences thermal runaway and causes the explosion-proof valve 310 to open, the high-temperature, high-pressure material ejected from the explosion-proof valve 310 is directly ejected into the diversion hole 103 and into the diversion channel 102, without spreading into the accommodating chamber 101. Furthermore, the isolation assembly 200 effectively separates the accommodating chamber 101 from the diversion channel 102, allowing the high-temperature, high-pressure material that enters the diversion channel 102 to be discharged in a targeted manner through the vent 121, preventing it from flowing back into the accommodating chamber 101. This indicates that when some battery cells 300 experience thermal runaway, other battery cells 300 are less affected, effectively preventing thermal runaway of the entire battery pack 10, thereby improving safety.

[0074] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery pack, characterized in that: include: A box body having an exhaust hole; an isolation component, which is disposed in the box body and forms a receiving cavity and a guide channel inside the box body, wherein the guide channel is connected to the exhaust hole, and the isolation component is formed with a plurality of guide holes connecting the receiving cavity and the guide channel; and A plurality of battery cells are accommodated in the accommodating cavity and are arranged one-to-one with the plurality of the guide holes. Each of the battery cells is provided with an explosion-proof valve, and one end of each of the battery cells provided with the explosion-proof valve is in contact with the inner wall of the accommodating cavity, and the explosion-proof valve is directed toward the corresponding guide hole.

2. The battery pack according to claim 1, characterized in that: The box body includes a top wall, a bottom wall arranged opposite to the top wall, and a ring wall connecting the top wall and the bottom wall, and the exhaust hole is opened in the ring wall.

3. The battery pack according to claim 1, characterized in that: The guide channel is formed in the middle of the box body and extends along the first direction. The accommodating cavities are distributed on both sides of the guide channel in the second direction, the second direction is perpendicular to the first direction, and a pole is provided at one end of each battery cell away from the explosion-proof valve.

4. The battery pack according to claim 1, characterized in that: A plurality of the accommodating cavities and the guide channels are formed, and the plurality of the accommodating cavities and the plurality of the guide channels are arranged in one-to-one correspondence, and the accommodating cavities are communicated with the corresponding guide channels through the guide holes.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The isolation component includes a cooling plate, and the cooling plate constitutes the guide channel and at least one side wall of the accommodating cavity.

6. The battery pack according to claim 5, characterized in that: The cooling plate includes a first cooling plate and a second cooling plate, and the two second cooling plates are arranged on the same side of the first cooling plate opposite to each other. The two second cooling plates, the first cooling plate and the inner wall of the box body together form the guide channel, and the guide holes are opened on the second cooling plates; each second cooling plate, the first cooling plate and the inner wall of the box body together form a accommodating cavity.

7. The battery pack according to claim 6, characterized in that: The first cooling plate is suspended in the box, and two second cooling plates are arranged on opposite sides of the first cooling plate to form the accommodating cavity and the guide channel on opposite sides of the first cooling plate.

8. The battery pack according to claim 6 or 7, characterized in that: The isolation assembly further includes a partition plate disposed between two opposite second cooling plates located on the same side of the first cooling plate.

9. The battery pack according to claim 5, characterized in that: It also includes a heat-conducting adhesive layer, which is arranged in the accommodating cavity and clamped between the battery cell and the cooling plate.

10. The battery pack according to claim 1, characterized in that: A sealing ring is arranged along the circumference of the explosion-proof valve.

11. The battery pack according to claim 1, characterized in that: The battery cell is a rectangular lithium-ion battery.

12. The battery pack according to any one of claims 1 to 11, characterized in that: A phase-change heat absorption structure is arranged in the flow guiding channel.

13. The battery pack according to claim 12, characterized in that: The phase change temperature of the phase change material constituting the phase change heat absorption structure is 50°C to 55°C.

14. The battery pack according to claim 13, characterized in that: The phase change material constituting the phase change heat absorption structure is paraffin.

15. The battery pack according to claim 12, characterized in that: The phase change material constituting the phase change heat absorption structure is coated on the inner wall of the guide channel.

16. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 15 above.

17. The electrical device according to claim 16, characterized in that: The power-consuming device is a new energy vehicle, and the battery pack is arranged at the bottom of the new energy vehicle.

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