Runner plate, battery pack shell, battery pack, power supply system and electric equipment

Abstract

The utility model relates to battery flame retardance, and discloses a runner plate which comprises a runner plate main body, a runner is formed in the runner plate main body, and the runner is used for circulating a flame-retardant medium; a communicating hole communicated with the runner is formed in the working surface of the runner plate main body, the communicating hole is used for communicating the runner with an accommodating cavity of the battery pack, and the runner plate main body is also provided with a communicating port for communicating the runner with the outside of the accommodating cavity of the battery pack. According to the runner plate, the problem of local overheating of the battery pack can be prevented or inhibited in advance from the interior of the battery pack, and the risk of firing of the battery pack is reduced. In addition, the utility model also relates to a battery pack shell comprising the runner plate, a battery pack, a power supply system and electric equipment.

Description

Technical Field

[0001] The utility model relates to battery flame retardancy, and in particular to a flow channel plate. In addition, the utility model also relates to a battery pack housing, a battery pack, a power supply system and an electrical device comprising the flow channel plate. Background Art

[0002] A fire in a battery pack is usually caused by local overheating, which leads to insulation failure, causing a short circuit fire, or a fire caused by heat diffusion. In the former case, the battery cell is not out of control, but the fire may cause the battery cell to lose control and lead to more serious accidents. In the latter case, the battery cell is out of control and caused by heat diffusion. After heat diffusion, the situation inside the battery pack is more complicated, the probability of fire is higher, and arcing hazards may occur.

[0003] Due to the complex internal conditions of existing battery packs, it is difficult to prevent battery pack fires in advance from within the battery pack, or to cool down the battery pack in time when local overheating occurs, which increases the probability of fire. Utility Model Content

[0004] One of the purposes of the utility model is to provide a flow channel plate, which can prevent or suppress the problem of local overheating of the battery pack in advance from the inside of the battery pack, thereby reducing the risk of fire in the battery pack.

[0005] A second objective of the present utility model is to provide a battery pack shell, which can isolate the batteries inside from contact with combustion-supporting gas, thereby reducing the risk of fire inside the battery pack.

[0006] The third object of the present utility model is to provide a battery pack, the battery shell used in the battery pack can isolate the internal batteries from the contact with the combustion-supporting gas, thereby reducing the risk of fire inside the battery pack.

[0007] A fourth objective of the present utility model is to provide a power supply system, which can quickly cool down the battery pack when local overheating occurs in the battery pack to prevent the battery pack from catching fire.

[0008] The fifth object of the utility model is to provide an electrical device, wherein the battery pack shell of the battery pack used in the electrical device can isolate the batteries inside it from the contact with the combustion-supporting gas, thereby reducing the risk of fire inside the battery pack, and the power supply system where the battery pack is located can quickly cool the battery pack when the battery pack is locally overheated, thereby avoiding the battery pack catching fire.

[0009] In order to solve the above technical problems, the first aspect of the utility model provides a flow channel plate, including a flow channel plate body, a flow channel is formed inside the flow channel plate body, and the flow channel is used to circulate a flame retardant medium; a connecting hole connected to the flow channel is opened on the working surface of the flow channel plate body, and the connecting hole is used to connect the flow channel with the accommodating cavity of the battery pack; the flow channel plate body is also provided with a connecting port for connecting the flow channel with the outside of the accommodating cavity of the battery pack.

[0010] Furthermore, there are a plurality of communicating holes, which are arranged along a first direction and provided at least at one end of the working surface of the flow channel plate body along a second direction, and the second direction intersects with the first direction.

[0011] Furthermore, the flow channel plate body is provided with a first communication port and a second communication port communicated with the flow channel, and the first communication port and the second communication port are used to connect the flow channel with the outside of the accommodating cavity of the battery pack.

[0012] Furthermore, the flow channel plate also includes a joint connected to the flow channel plate body, the joint includes a first inlet and outlet hole and a second inlet and outlet hole, the first inlet and outlet hole and the second inlet and outlet hole are both connected to the flow channel, so that the flame retardant medium flows into and out of the flow channel through the first inlet and outlet hole and the second inlet and outlet hole.

[0013] Furthermore, an extension portion is provided at one end of the flow channel plate body along the second direction, and the joint is connected to the extension portion.

[0014] Furthermore, a cross section of the communicating hole perpendicular to a thickness direction of the flow channel plate body gradually increases from the inside of the flow channel to the outside of the flow channel.

[0015] Furthermore, the flow channel plate body includes a first flow channel plate and a second flow channel plate, the first flow channel plate is connected to the second flow channel plate, the first flow channel plate is provided with a protrusion facing toward or away from the second flow channel plate, the protrusion is connected to the second flow channel plate to form the flow channel, and the working surface is provided on the side of the second flow channel plate facing away from the first flow channel plate.

[0016] The second aspect of the utility model discloses a battery pack shell, comprising a flow channel plate as described in any one of the above technical solutions, wherein a housing cavity for housing batteries is provided inside the battery pack shell, and the connecting hole connects the flow channel with the housing cavity.

[0017] Further, the battery pack shell includes a first shell and a second shell, the first shell and / or the second shell is the flow channel plate, and the first shell and the second shell together form the accommodating cavity.

[0018] Furthermore, the first shell is the flow channel plate, the second shell includes a connected bottom plate and a frame, a heat exchange flow channel is arranged in the bottom plate, the flow channel plate is connected to the end of the frame away from the bottom plate to enclose the accommodating cavity, and the heat exchange flow channel is used to exchange heat for the battery.

[0019] A third aspect of the utility model discloses a battery pack, comprising at least one battery and a battery shell as described in any one of the technical solutions of the second aspect, wherein the battery is arranged in a receiving cavity inside the battery pack shell.

[0020] A fourth aspect of the utility model discloses a power supply system, comprising a battery pack according to any one of the technical solutions of the third aspect, wherein the flow channel and the accommodating cavity are filled with a first flame retardant medium.

[0021] Furthermore, the first shell is the flow channel plate, the second shell includes a connected bottom plate and a frame, a heat exchange flow channel is arranged in the bottom plate, the flow channel plate is connected to the end of the frame away from the bottom plate to enclose the accommodating cavity, and the heat exchange flow channel is used to exchange heat for the battery.

[0022] The fifth aspect of the utility model discloses an electrical device, comprising the flow channel plate described in any one of the technical solutions of the first aspect, or the battery pack described in the technical solution of the third aspect, or the power supply system described in any one of the technical solutions of the fourth aspect.

[0023] Through the above technical solution, the beneficial effects of the utility model are as follows:

[0024] The utility model provides a flow channel plate, which includes a flow channel plate body, wherein a flow channel is formed inside the flow channel plate body, the flow channel is used to circulate a flame retardant medium, a connecting hole connected to the flow channel is opened on the working surface of the flow channel plate body, the connecting hole is used to connect the flow channel with a accommodating cavity of a battery pack, and a connecting port for connecting the flow channel with the outside of the accommodating cavity of the battery pack is also provided on the flow channel plate body. The utility model has a simple structure and can be used as an internal component of a battery pack. When the battery pack is locally overheated, a fluid serving as a flame retardant medium can be transported to the inside of the battery pack through the flow channel to cool the battery pack from the inside, thereby avoiding short circuit fire or heat diffusion fire caused by insulation failure due to local overheating.

[0025] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of a specific implementation of the flow channel plate of the utility model;

[0028] Figure 2 yes Figure 1 A local enlarged view of point A;

[0029] Figure 3 It is a structural schematic diagram of a specific implementation mode of the first flow channel plate of the utility model;

[0030] Figure 4 It is a structural schematic diagram of a specific implementation of the battery pack of the utility model;

[0031] Figure 5 It is a structural schematic diagram of a specific implementation mode of the second housing of the utility model;

[0032] Figure 6 It is a structural schematic diagram of a specific implementation mode of the power supply system of the utility model.

[0033] Description of Reference Numerals

[0034] 1 channel plate 11 connecting hole

[0035] 12 connector 121 first inlet and outlet hole

[0036] 122 second inlet and outlet hole 13 extension

[0037] 14 channel plate body 141 first channel plate

[0038] 142 second flow channel plate 143 raised portion

[0039] 15 working surface 2 batteries

[0040] 3First shell 4Second shell

[0041] 41 base plate 42 frame

[0042] 5 Accommodation chamber 6 Control valve

[0043] 7 Flame retardant medium storage device DETAILED DESCRIPTION

[0044] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation modes described herein are only used to illustrate and explain the present invention, and the protection scope of the present invention is not limited to the specific implementation modes described below.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "arrange", "connect", and "connect" should be understood in a broad sense. For example, the connection can be a direct connection or an indirect connection through an intermediate medium or an intermediate connector. It can be a fixed connection or a detachable connection, or an integral connection, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0047] In the present invention, unless otherwise specified, the directional words used, such as "inside" and "outside", are defined as the inside and outside of the corresponding parts. Specifically, in the drawings provided in the present invention, the orientation or positional relationship used is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; the orientation terms of the present invention should be understood in conjunction with the actual installation state.

[0048] Battery pack fires are usually caused by local overheating, insulation failure, short circuit fires, or heat diffusion fires. Since the internal structure of the battery pack is relatively complex, there is no way to quickly cool down the battery pack when local overheating occurs, so it is easy to catch fire. The two fire phenomena are that the former battery cell is not out of control, but the fire may cause the battery cell to lose control and cause more serious accidents; the latter is caused by heat diffusion due to the loss of control of the battery cell. After heat diffusion, the internal situation of the battery pack is relatively complicated, the probability of fire is high, and arcing hazards may occur. In response to this problem, the utility model provides a flow channel plate.

[0049] See also Figure 1 The flow channel plate includes a flow channel plate body 14, a flow channel is formed inside the flow channel plate body 14, and the flow channel is used to circulate the flame retardant medium. A connecting hole 11 connected to the flow channel is opened on the working surface 15 of the flow channel plate body 14, and the connecting hole 11 is used to connect the flow channel with the accommodating cavity 5 of the battery pack. The flow channel plate body 14 is also provided with a connecting port that can connect the flow channel with the outside of the accommodating cavity 5 of the battery pack.

[0050] The flow channel plate 1 has a simple structure and can be installed inside the battery pack as an internal component. When thermal runaway or local overheating occurs inside the battery pack, the flow channel plate 1 can transport a flame retardant medium or a fluid capable of extremely rapid temperature reduction to the inside of the battery pack through its own flow channel. Specifically, the fluid enters the flow channel from the connecting port, is transmitted through the flow channel, and is ejected from the connecting hole 11. In addition, because oxygen is a combustion-supporting substance, the flow channel plate 1 can be installed inside the battery pack. After the battery pack is installed, the air inside the battery pack's accommodating cavity can be extracted through the flow channel of the flow channel plate 1, and then the flame retardant medium with flame retardancy can be sent into the accommodating cavity, thereby reducing the risk of fire inside the battery pack.

[0051] It should be noted that the “working surface 15 ” in the above technical solution refers to the surface of the flow channel plate body 14 facing the inside of the battery pack or other electrical equipment.

[0052] It should also be noted that the flow channel plate 1 can not only be used inside a battery pack, but can also be set in other devices, serving as a mounting plate and connecting the internal space of the device with the external environment of the device.

[0053] Further, a plurality of connecting holes 11 may be provided, and the plurality of connecting holes 11 are arranged along a first direction and provided at least at one end of the working surface 15 of the flow channel plate body 14 along a second direction, wherein the first direction intersects with the second direction. It is understood that the "first direction" may be the length direction or the width direction of the flow channel plate body 14, and the corresponding "second direction" may be the width direction or the length direction of the flow channel plate body 14, such as Figure 1 As shown, as a specific embodiment of the utility model, the first direction is the width direction of the flow channel plate body 14, and the second direction is the length direction of the flow channel plate body 14. In this embodiment, the battery is provided with electrodes at both ends along the second direction. Therefore, the flow holes 11 are arranged along the width direction, and two groups are provided, which are respectively provided at both ends of the working surface 15 of the flow channel plate body 14 along the length direction of the flow channel plate body 14, so as to correspond to the ends of the battery 2 provided in the accommodating cavity 5 of the battery pack, because the places where local heating is most likely to occur inside the battery pack and the local heating situation is more serious are the two ends of the battery 2 inside the battery pack. Therefore, as shown in FIG. Figure 1 As shown, the connecting holes 11 are arranged at both ends of the working surface 15 of the flow channel plate body 14, so that the two ends of the battery 2 can be sprayed centrally, so that the local heating area can be quickly cooled down to avoid fire.

[0054] It should be noted that when providing the connecting holes 11, if the battery has electrodes arranged along the height direction, the connecting holes 11 may be provided along both the first direction and the second direction to cool down the battery and prevent it from burning.

[0055] In addition, as another specific embodiment of the utility model, a first communication port and a second communication port that can communicate with the flow channel are provided on the flow channel plate body 14, and the first communication port and the second communication port are used to connect the flow channel plate 1 with the outside of the battery pack's accommodating chamber 5. It can be understood that when the battery pack is installed, the first communication port and the second communication port can be used to vacuum the battery pack's accommodating chamber 5 and introduce a flame retardant medium. Specifically, after the battery pack is installed, the air in the battery pack's accommodating chamber 5 can be extracted through the first communication port, and at the same time, the flame retardant medium can be delivered to the accommodating chamber 5 through the second communication port. In this way, vacuum treatment and flame retardant medium filling can be carried out simultaneously, which shortens the working time and improves the installation efficiency.

[0056] It should be noted that the specific location of the connecting hole 11, the first connecting port or the second connecting port can be set according to the actual usage. In addition, it should be noted that the flame retardant medium can be nitrogen or liquid nitrogen. Nitrogen can destroy the combustion conditions and reduce the risk of fire inside the battery pack. Liquid nitrogen can achieve rapid cooling and slow down the continuous heat diffusion caused by local heating. In addition, the flame retardant medium can also be a flame retardant gas, such as any one of carbon dioxide, argon, helium and neon. It should be further noted that the fluid flowing in the flow channel can be a liquid, a gas or other flowing mixture.

[0057] Secondly, in the present utility model, if Figure 1 and Figure 2 As shown, a joint 12 that can be connected to the flow channel plate body 14 is also provided on the flow channel plate 1, and the joint 12 includes a first inlet and outlet hole 121 and a second inlet and outlet hole 122. The first inlet and outlet hole 121 and the second inlet and outlet hole 122 are both connected to the flow channel so that the fluid flows into or out of the flow channel through the first inlet and outlet hole 121 and the second inlet and outlet hole 122.

[0058] It is understandable that because the internal structure of the battery pack is relatively complex, and the battery pack has many parts that can serve as combustibles, such as: plastic parts, insulating films and other non-metallic parts, in addition to a large amount of electrolyte sprayed due to loss of control of the battery cells, these combustibles will cause insulation failure after local overheating inside the battery pack, causing a short circuit and fire, and the sparks that burst out will ignite with the assistance of oxygen. Therefore, when the flow channel plate provided by the utility model is used inside the battery pack, in order to reduce the risk of fire inside the battery pack, the air inside the battery pack will be sucked out and then the flame-retardant gas will be filled into the battery pack to prevent the sparks from coming into contact with oxygen.

[0059] A joint is provided, and one of the first inlet and outlet hole 121 and the second inlet and outlet hole 122 is used to extract the air inside the battery pack, and the other is used to fill the inside of the battery pack with a flame retardant medium. It can be understood that whether it is to extract the gas or to inject the flame retardant medium, it is necessary to communicate with the interior of the battery pack through the flow channel and the connecting hole 11.

[0060] It should be noted that the first inlet and outlet hole 121 can be communicated with one of the first communication port or the second communication port, and the second inlet and outlet hole 122 can be communicated with the other of the first communication port or the second communication port to form a flow channel with the flow channel.

[0061] As a specific embodiment of the joint, Figure 1 As shown in the figure, the first inlet and outlet hole 121 and the second inlet and outlet hole 122 can be set at one end of the flow channel plate 1. Such a design can optimize the structure, facilitate installation, and save installation space. In addition, the apertures of the first inlet and outlet hole 121 and the second inlet and outlet hole 122 can be inconsistent in size, so that the fluid inlet hole and the fluid outlet hole can be distinguished to prevent confusion during use.

[0062] Also, see Figure 2 As a specific embodiment of the utility model, an extension portion 13 is provided at one end of the flow channel plate body 14 along the second direction, and the connector is connected to the extension portion 13. The extension portion is used to install the connector. On the one hand, it will not affect the flow channel in the flow channel plate body 14 and can also increase the capacity of the battery pack. On the other hand, it is also convenient for the connector 12 to be connected to other devices, thereby improving space utilization.

[0063] It should be noted that the location of the extension portion 13 is not limited to Figure 2 As shown in the figure, it is not limited to being set at one end of the second direction along the flow channel plate body 14. When installing the battery pack, it can be selectively set as needed. For example, extension portions 13 are set at both ends of the second direction along the flow channel plate body 14. The extension portion 13 can extend to the outside of the accommodating cavity 5 of the battery pack. On the one hand, it serves as a portion connecting the inside and outside of the battery pack. On the other hand, it can also serve as a mounting portion to meet the need of installing the flow channel plate 1 in the battery pack.

[0064] Furthermore, as a specific embodiment of the connecting hole 11, the cross section of the connecting hole 11 perpendicular to the thickness direction of the flow channel plate body 14 gradually increases from the inside of the flow channel to the outside of the flow channel. The advantage of such a design is that when the fluid is ejected from the connecting hole 11, it can form an umbrella shape to expand the range of the ejection. Because a plurality of connecting holes 11 are provided, the ejection ranges of two adjacent connecting holes 11 can partially overlap to achieve a more comprehensive cooling treatment. It should be noted that in this specific embodiment, the "thickness direction" is perpendicular to the first direction and the second direction.

[0065] In the present utility model, if Figure 3 As shown, the flow channel plate body 1 includes a first flow channel plate 141 and a second flow channel plate 142, the first flow channel plate 141 is connected to the second flow channel plate 142, and a protrusion 143 is provided on the working surface of the first flow channel plate 141 facing or facing away from the second flow channel plate 142, and these protrusions 143 are connected to the second flow channel plate 142, and a flow channel can be formed between two adjacent protrusions 143, and the side of the second flow channel plate 142 facing away from the first flow channel plate 141 is set as a working surface 15. By setting the protrusion 143, the connection space between the first flow channel plate 141 and the second flow channel plate 142 is separated into a flow channel, so as to meet the circulation of the flame retardant medium.

[0066] In addition, as other specific embodiments of forming the flow channel, not only can the protrusion 143 be provided on the working surface of the first flow channel plate 141 facing or facing away from the second flow channel plate 142, but a protruding structure can also be provided on the second flow channel plate 142, wherein the protrusion 143 faces the protruding structure, the protruding structure and the protrusion 143 match, and a working surface 15 is provided on the side of the second flow channel plate 142 facing away from the first flow channel plate 141. In this way, the protruding structure and the protrusion 143 can also serve as the reinforcement structure of the second flow channel plate 142 and the first flow channel plate 141, respectively, and can further enhance the structural strength of the flow channel plate body 1.

[0067] Furthermore, the protruding structures and raised portions 143 provided on the first flow channel plate 141 and / or the second flow channel plate 142 may be a plurality of parallel arranged strip-shaped protruding structures to form a flow channel. As a specific embodiment of the flow channel plate, the flow channel plate body 1 may be supported by brazing two stamping plates, and a plurality of strip-shaped protruding structures are provided on one or both of them, which may serve as the side walls of the flow channel on the one hand, and as a reinforcing structure to enhance the structural strength of the entire flow channel plate body 1 on the other hand.

[0068] Specifically, the strip-shaped protruding structure may include a plurality of protruding structures arranged in sequence, such as Figure 2 As shown, two adjacent strip-shaped protruding structures are balanced with each other. In order to enhance the fluidity of the fluid in the flow channel, each protruding structure can be composed of several protruding structures. In this way, the fluid can be diverted during the fluid transportation so that each connecting hole 11 can spray out the fluid.

[0069] It should be noted that the protruding structure and the raised portion 143 may be arranged according to specific usage conditions. For example, the raised portion 143 may be arranged on the second flow channel plate 142 , and the protruding structure may be arranged on the first flow channel plate 141 .

[0070] In addition, see Figure 1A number of mounting holes are evenly arranged on the edge of the flow channel plate body 1, and these mounting holes can facilitate the flow channel plate to be installed in the battery pack.

[0071] See also Figure 4 The second aspect of the utility model provides a battery pack shell, which includes the flow channel plate 1 provided in the first aspect, and a accommodating cavity 5 capable of accommodating a battery 2 is provided in the battery pack shell, and the accommodating cavity 5 is connected to the flow channel through a connecting hole 11.

[0072] Furthermore, the battery pack shell includes a first shell 3 and a second shell 4, which together form a accommodating cavity 5 capable of accommodating the battery 2, and the accommodating cavity 5 is filled with a flame retardant medium, wherein one of the first shell 3 or the second shell 4 can be the flow channel plate 1 provided in the first aspect of the utility model, and the accommodating cavity 5 is connected to the flow channel through a connecting hole 11.

[0073] Further, as a specific embodiment of the present invention, the first shell 3 of the battery pack shell can be a flow channel plate 1, such as Figure 5 As shown, the second shell 4 includes a connected bottom plate 41 and a frame 42, wherein a heat exchange flow channel is provided in the bottom plate 41, and the flow channel plate 1 is connected to the end of the frame 42 facing away from the bottom plate 41, and the bottom plate 41, the frame 42 and the flow channel plate 1 can form a receiving cavity 5, and the heat exchange flow channel is used to exchange heat for the battery 2 to prevent the battery 2 from overheating and causing a fire. It should be noted that the battery pack shell is not filled with a flame retardant medium, and the flame retardant medium shell is filled in the flow channel of the flow channel plate 1 and the receiving cavity 5.

[0074] It should also be noted that when installing the battery pack, after the installation is completed, the air in the accommodating chamber 5 can be extracted through the cooperation of the flow channel on the flow channel plate 1 and the connecting hole 11, and then the flame retardant medium can be transported into the accommodating chamber 5 through the flow channel, and because the flow channel and the accommodating chamber 5 are connected through the connecting hole 11, when transporting the flame retardant medium, the flame retardant medium can be filled in the flow channel after the accommodating chamber 5 is filled. The structure of the battery pack shell is simple, and by using the flow channel plate 1 instead of the first shell 3 or the second shell 4, the flame retardant medium can be filled after the battery pack is installed, which can reduce the risk of fire in the battery pack from the inside. In addition, when the battery 2 is locally overheated and heat diffusion is caused, the flame retardant medium with an extremely rapid cooling effect can be quickly transported into the battery pack through the flow channel to avoid continued heat diffusion and cause the battery pack to catch fire.

[0075] The third aspect of the present invention provides a battery pack, which includes at least one battery 2 and the battery pack shell provided by the second aspect of the present invention, wherein the battery pack shell used in the battery pack is provided with a flow channel plate 1 having a flow channel, and the accommodating cavity 5 inside the battery pack is filled with a flame retardant medium through the flow channel to prevent fire inside the battery pack. When the battery pack shell is intact, there will be no combustion-supporting materials inside the battery pack, so when sparks appear inside the battery pack due to a short circuit, the combustible materials inside the battery pack will not be ignited to cause a fire.

[0076] Because the main reason for the insulation failure of the battery pack is the loss of control of the battery 2 cell, the pressure generated by the loss of control of the cell will push open the explosion-proof valve in the battery pack or cause the airtightness of other parts of the package to fail, and at the same time, the nitrogen filled in the package as a flame retardant medium will also be discharged from the package; the loss of control of the cell may cause a chain reaction, that is, heat diffusion, and the airtightness of the package will fail and air will flow into the inside, increasing the probability of short circuit and fire. In response to this problem, the fourth aspect of the utility model provides a power supply system, which includes the battery pack provided by the third aspect of the utility model, and the flow channel in the flow channel plate 1 in the battery pack and the accommodating cavity 5 in the battery pack are filled with a first flame retardant medium.

[0077] Further, see Figure 6 The power supply system includes the battery pack provided by the third aspect of the utility model, and further includes a control valve 6 and a flame retardant medium storage device 7. The flame retardant medium storage device 7 is used to store a second flame retardant medium. The flame retardant medium storage device 7 is connected to the connecting port of the flow channel plate 1 in the battery pack through the control valve 6. In addition, the control valve 6 can control the flame retardant medium storage device 7 to transport the second flame retardant medium into the accommodating cavity 5 of the battery pack.

[0078] It should be noted that the second flame retardant medium can be the same as the first flame retardant medium, for example, both are nitrogen, or different from the first flame retardant medium, for example, the first flame retardant medium is nitrogen and the second flame retardant medium is liquid nitrogen or other flame retardant liquids.

[0079] Furthermore, the power supply system also includes a temperature acquisition device, which can control the start of the control valve 6. The temperature acquisition device can sense the temperature of the battery pack. When the local temperature of the battery pack reaches a preset value, the temperature acquisition device starts the control valve 6 to transport a flame retardant medium with a cooling effect into the accommodating cavity 5 of the battery pack.

[0080] It should be noted that the power supply system can achieve rapid cooling by injecting liquid nitrogen as a flame retardant medium into the interior through the flow channel plate after the battery cell out of control alarm in the battery pack to slow down the continuous heat diffusion, and reduce the concentration of oxygen rushing into the pack due to seal failure to achieve the purpose of rapid fire extinguishing, thereby improving the safety performance of the entire battery pack.

[0081] Specifically, in combination with an actual use embodiment, after the battery pack is installed, nitrogen is filled into the accommodating cavity 5 in the pack through the flow channel in the flow channel plate 1, and nitrogen is also filled into the flow channel, and then the flame retardant medium storage device 7 is connected to the inlet and outlet holes of the flow channel plate 1 through the control valve 6. When thermal runaway occurs inside the pack, the battery pack temperature collected by the temperature collection device reaches a preset value, which is transmitted to the vehicle end through an electrical signal, so that the vehicle receives a thermal alarm signal and issues an instruction to the control valve 6. After the control valve 6 is opened, a large amount of liquid nitrogen in the flame retardant medium storage device 7 quickly enters the flow channel of the flow channel plate, and is directly sprayed to the end of the battery 2 through the connecting hole 11, and fills the inside of the pack; the influx of a large amount of liquid nitrogen can achieve rapid cooling of the inside of the pack and effectively prevent heat diffusion; after thermal runaway occurs, the nitrogen protection inside the pack fails, and the continuous influx of liquid nitrogen can make up for the protection after the pack seal fails; a nitrogen protection scheme combining static and dynamic is realized, which greatly reduces the risk of fire and improves the overall safety of the vehicle.

[0082] The fifth aspect of the utility model provides an electrical device, which includes the flow channel plate 1 provided in the first aspect, or includes the battery pack provided in the third aspect, or includes the power supply system provided in the fourth aspect. The power supply system used by the electrical device has good fireproof performance, and when a fire occurs, it can suppress the development of the fire from the inside, providing more time for fire extinguishing.

[0083] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "a specific implementation", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0084] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0085] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0086] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A flow channel plate (1), characterized in that: The invention comprises a flow channel plate body (14), wherein a flow channel is formed inside the flow channel plate body (14), and the flow channel is used to circulate a flame retardant medium; a connecting hole (11) connected to the flow channel is opened on the working surface (15) of the flow channel plate body (14), and the connecting hole (11) is used to connect the flow channel with a receiving cavity (5) of a battery pack; the flow channel plate body (14) is also provided with a connecting port for connecting the flow channel with the outside of the receiving cavity (5) of the battery pack.

2. The flow channel plate (1) according to claim 1, characterized in that: The number of the communicating holes (11) is multiple, and the multiple communicating holes (11) are arranged along a first direction and provided at least at one end of the working surface (15) of the flow channel plate body (14) along a second direction, and the second direction intersects with the first direction.

3. The flow channel plate (1) according to claim 1, characterized in that: The flow channel plate body (14) is provided with a first communication port and a second communication port which are in communication with the flow channel, and the first communication port and the second communication port are used to connect the flow channel with the outside of the accommodating cavity (5) of the battery pack.

4. The flow channel plate (1) according to any one of claims 1 to 3, characterized in that: The flow channel plate (1) further comprises a joint (12) connected to the flow channel plate body (14), the joint (12) comprising a first inlet and outlet hole (121) and a second inlet and outlet hole (122), the first inlet and outlet hole (121) and the second inlet and outlet hole (122) both being in communication with the flow channel so that the flame retardant medium can flow into and out of the flow channel through the first inlet and outlet hole (121) and the second inlet and outlet hole (122).

5. The flow channel plate (1) according to claim 4, characterized in that: An extension portion (13) is provided at one end of the flow channel plate body (14) along the second direction, and the joint (12) is connected to the extension portion (13).

6. The flow channel plate (1) according to any one of claims 1 to 3, characterized in that: The cross section of the communication hole (11) perpendicular to the thickness direction of the flow channel plate body (14) gradually increases from the inside of the flow channel to the outside of the flow channel.

7. The flow channel plate (1) according to any one of claims 1 to 3, characterized in that: The flow channel plate body (14) comprises a first flow channel plate (141) and a second flow channel plate (142); the first flow channel plate (141) is connected to the second flow channel plate (142); the first flow channel plate (141) is provided with a protrusion (143) facing toward or away from the second flow channel plate (142); the protrusion (143) is connected to the second flow channel plate (142) to form the flow channel; and the second flow channel plate (142) is provided with the working surface (15) on a side facing away from the first flow channel plate (141).

8. A battery pack housing, characterized in that: It comprises a flow channel plate (1) according to any one of claims 1 to 7, wherein a housing (5) for housing a battery (2) is provided inside the battery pack shell, and the connecting hole (11) connects the flow channel with the housing (5).

9. The battery pack casing according to claim 8, characterized in that: The battery pack shell comprises a first shell (3) and a second shell (4); the first shell (3) and / or the second shell (4) is the flow channel plate (1); the first shell (3) and the second shell (4) together form the accommodating cavity (5).

10. The battery pack casing according to claim 9, characterized in that: The first shell (3) is the flow channel plate (1), the second shell (4) comprises a connected bottom plate (41) and a frame (42), a heat exchange flow channel is arranged in the bottom plate (41), the flow channel plate (1) is connected to an end of the frame (42) away from the bottom plate (41) to enclose and form the accommodating cavity (5), and the heat exchange flow channel is used to exchange heat for the battery (2).

11. A battery pack, characterized in that: The battery pack comprises at least one battery (2) and a battery pack housing according to any one of claims 8 to 10, wherein the battery (2) is arranged in the accommodating cavity (5).

12. A power supply system, characterized in that: Comprising the battery pack according to claim 11, the flow channel and the accommodating cavity (5) are filled with a first flame retardant medium.

13. The power supply system according to claim 12, characterized in that: It also includes a control valve (6) and a flame retardant medium storage device (7), wherein the flame retardant medium storage device (7) is used to store a second flame retardant medium, and the flame retardant medium storage device (7) is connected to the communication port of the flow channel plate body (14) through the control valve (6) so as to be able to transport the second flame retardant medium to the accommodating chamber (5) through the control valve (6).

14. An electrical device, characterized in that: It comprises the flow channel plate (1) according to any one of claims 1 to 7, or comprises the battery pack according to claim 11, or comprises the power supply system according to claim 12 or 13.

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