Liquid cooling plate

Abstract

The utility model belongs to the field of battery safety, and discloses a liquid cooling plate which comprises a first channel and a second channel which are arranged in the liquid cooling plate and are independent from each other. The first channel is used for containing cooling liquid; a plurality of first through holes are formed in the outer wall of one side, close to the battery cell stacking body, of the second channel, the surfaces of the first through holes are correspondingly covered with hot melting films, and when the hot melting films are melted, if the second channel is filled with a cooling and fire extinguishing medium, the first through holes are used for spraying the cooling and fire extinguishing medium; and if the second channel is used as an exhaust channel, high-temperature gas generated in the cell stack enters the second channel through the first through hole and is exhausted. The high-temperature part in the battery can be rapidly cooled or extinguished at a fixed point, the reaction of the out-of-control battery cell is controlled, heat cannot be greatly diffused to the surrounding normal battery cells, and the thermal runaway diffusion of the battery pack is blocked.

Description

Technical Field

[0001] The utility model relates to the technical field of battery safety, in particular to a liquid cooling plate. Background Art

[0002] At present, the energy density of power batteries is getting higher and higher, and the energy density of single cells has exceeded 300Wh / kg. After thermal runaway occurs in a single cell, there is a very high heat generation and a fast gas generation rate. The liquid cooling plate designed in the prior art cannot cool the local high-temperature cells at a fixed point, and no exhaust channel is designed. During the discharge of high-temperature gas from the explosion-proof valve on the battery pack shell, the high-temperature gas will pass through other untriggered cells in the battery pack. The high-temperature gas can easily heat the normal cells, causing the normal cells on the exhaust path to be triggered, causing the thermal runaway of the battery pack to spread, endangering the safety of passengers and property. In the prior art, the fire extinguishing flow channel is connected to the main flow channel, the coolant flow in the flow channel is too large, and the coolant cannot be continuously sprayed to cool down. The cooling material in the fire extinguishing pipeline can only be consistent with the main flow channel. At the same time, the fire extinguishing material cannot be used in the fire extinguishing pipeline or used as an exhaust channel. The fire extinguishing application has great limitations and cannot take into account the normal use scenario and the rapid cooling and fire extinguishing scenario after thermal runaway.

[0003] Therefore, how to rapidly cool or extinguish the high-temperature parts of the battery pack, control the reaction of the runaway battery cells, prevent the heat from spreading to the surrounding normal battery cells, and block the spread of thermal runaway of the battery pack is an urgent problem to be solved. Utility Model Content

[0004] The main purpose of the utility model is to provide a liquid cooling plate, aiming to solve the technical problem of how to rapidly cool or extinguish the high-temperature parts of the battery pack, control the reaction of the runaway battery cells, prevent the heat from spreading to the surrounding normal battery cells in large quantities, and block the spread of thermal runaway of the battery pack.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present application proposes a liquid cooling plate, wherein a first channel and a second channel independent of each other are arranged inside the liquid cooling plate; the first channel is used to accommodate coolant; a plurality of first through holes are arranged on the outer wall of the second channel on one side close to the battery cell stack, and the surface of the first through holes is correspondingly covered with a hot melt film. When the hot melt film melts, if a cooling and fire extinguishing medium is poured into the second channel, the first through hole is used to spray the cooling and fire extinguishing medium; if the second channel is used as an exhaust channel, the high-temperature gas generated in the battery cell stack enters the second channel through the first through hole and is discharged.

[0006] Furthermore, the cooling and fire-extinguishing medium is liquid, gas or powder.

[0007] Furthermore, it also includes a first inlet and a first outlet, and the first inlet and the first outlet are connected to the inside of the first channel.

[0008] Furthermore, when the second channel is filled with a temperature-reducing fire-extinguishing medium, a second inlet and a second outlet are correspondingly provided on the second channel, and the second inlet and the second outlet are communicated with the interior of the second channel.

[0009] Furthermore, when the second channel is used as an exhaust channel, an exhaust port is provided on the second channel, and a one-way solenoid valve is provided on the exhaust port for receiving a thermal runaway signal to open and close the exhaust.

[0010] Furthermore, when the second channel is filled with a cooling and fire-extinguishing medium, the flow rate of the first channel is in the range of 10 L / min-20 L / min, and the flow rate of the second channel is in the range of 2 L / min-5 L / min.

[0011] Furthermore, a support and flow-guiding boss is provided on the liquid cooling plate corresponding to the first channel.

[0012] Furthermore, the first channels include a plurality of first channels, which are spaced in sequence along the width direction of the liquid cooling plate on the inner wall of the liquid cooling plate on one side close to the battery cell stack, a first spacing area is formed between each of the first channels, and a first gap is formed between the first channel and one side of the liquid cooling plate in the width direction, and a plurality of the first spacing areas are connected to the first gap to form the second channel; and the first through holes are provided on one side of the liquid cooling plate corresponding to the first spacing areas and the first gaps.

[0013] Furthermore, the first channels include a plurality of first channels, which are spaced in sequence along the width direction of the liquid cooling plate on the inner walls on both sides in the thickness direction of the liquid cooling plate, a second spacing area is formed between the first channels on each side, and a specified spacing is left between the first channels on both sides; the first channels on both sides are separated from one side in the width direction of the liquid cooling plate by a second gap, and the second gap is connected to the second spacing area and the specified spacing to form the second channel.

[0014] Furthermore, the first through hole is provided on one side of the liquid cooling plate corresponding to the second spacing area and the second gap.

[0015] Furthermore, the first channel and the second channel are linear channels.

[0016] Beneficial effects:

[0017] In addition to the first channel for cooling, the liquid cooling plate of the utility model is also designed with a second channel independent of the first channel. A first through hole is arranged on one side of the second channel, and the through hole is covered with a hot-melt film. When one or more battery cells in the battery pack are in thermal runaway, the hot-melt film at the runaway battery cell melts, and the first through hole at the corresponding position opens, and the cooling and fire-extinguishing medium is ejected from the fixed-point cooling nozzle hole, so as to rapidly cool or extinguish the high-temperature part, control the reaction of the runaway battery cell, prevent the heat from spreading to the surrounding normal battery cells in large quantities, and block the spread of thermal runaway of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view of a liquid cooling plate channel according to an embodiment of the utility model;

[0019] Figure 2 This is a structural schematic diagram of one side of a liquid cooling plate (bracket side) of an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of one side of a liquid cooling plate (battery cell side) according to an embodiment of the present invention;

[0021] Figure 4 This is a cross-sectional schematic diagram of a liquid cooling plate according to an embodiment of the utility model;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the assembly of the liquid cooling plate and the battery cell stack according to one embodiment of the utility model;

[0023] Figure 6 It is a schematic diagram of a three-dimensional exploded structure of a liquid cooling plate and a battery pack assembly according to an embodiment of the utility model;

[0024] Figure 7 A schematic diagram of the battery pack structure of an embodiment of the utility model;

[0025] Figure 8 This is a schematic diagram of the structure of a liquid cooling plate according to an embodiment of the utility model;

[0026] Fig. 9 This is a schematic diagram of the structure of a liquid cooling plate according to an embodiment of the utility model;

[0027] Fig.10 This is a schematic diagram of the structure of a liquid cooling plate according to an embodiment of the utility model;

[0028] Fig.11 A schematic diagram of the flow paths of the first channel and the second channel in one embodiment of the utility model;

[0029] in:

[0030] 100, liquid cooling plate; 101, first channel; 102, second channel; 103, first through hole; 104, first inlet; 105, second inlet; 106, first outlet; 107, second outlet; 108, hot melt film; 110, support and guide boss; 200, battery cell stack; 300, battery pack; 111, first spacer; 112, first gap; 201, second spacer; 202, second gap.

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] In the description of the present utility model, 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" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model 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 utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot 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 features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, 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 utility model can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] Reference Figures 1 to 11 The utility model proposes a liquid cooling plate 100 and a battery pack 300, wherein the liquid cooling plate 100 is provided with a first channel 101 and a second channel 102 which are independent of each other; the first channel 101 is used to contain a coolant; a plurality of first through holes 103 are provided on an outer wall of one side of the second channel 102 close to the battery cell stack 200, and a hot melt film 108 is correspondingly covered on the surface of the first through holes 103. When the hot melt film 108 melts, if a cooling and fire extinguishing medium is poured into the second channel 102, the first through hole 101 is used to spray the cooling and fire extinguishing medium; if the second channel is used as an exhaust channel, the high-temperature gas generated in the battery cell stack 200 enters the second channel 102 through the first through hole 103 and is discharged.

[0037] In this embodiment, the liquid cooling plate 100 can be welded by two bottom plates on both sides. The material of the liquid cooling plate 100 is preferably a metal material with a high thermal conductivity, such as aluminum alloy, etc., wherein a first channel 101 and a second channel 102 are independently arranged on one side of one bottom plate close to the other bottom plate, wherein the second channel 102 extends and bends toward the direction of the first channel 101 every time it extends a certain distance, forming a "J"-shaped bend, and the "J"-shaped bend allows the second channel 102 to adapt to the height of the battery cell stack 200, so as to facilitate the fixed-point cooling, temperature reduction or discharge of high-temperature gas of the battery cell; and the shape of the first channel 101 is adapted to the shape of the second channel 102, wherein the first channel 101 is used to accommodate the coolant (commonly used is ethylene glycol solution), and the second channel 102 is provided with a plurality of first through holes 103 on the outer wall of one side close to the battery cell stack 200, and the first through holes 103 are arranged on the curved surface on the "J"-shaped surface to match the position of a single battery cell, wherein the specific flow directions of the first channel 101 and the second channel 102 are as follows Fig.11As shown. When the battery cells are stacked in the width direction of the liquid cooling plate 100, each through hole corresponds to a separate battery cell; in addition, the back of the entire liquid cooling plate 100 (away from the battery cell and close to the battery pack 300 bracket) is a plane, the entire plane is stressed, and there is no local stress. Compared with the prior art, the liquid cooling plate 100 has a higher structural strength. The surface of the first through hole 103 is covered with a hot melt film 108. Compared with the prior art in which the entire pipeline is a heat-sensitive material, the amount of hot melt material used is less, and the hot melt position and the direction of the coolant spray can be precisely controlled, which can achieve fixed-point directional cooling of thermal runaway batteries. The hot melt film 108 is fixed to the surface of one side of the liquid cooling plate 100 where the first through hole is provided by hot pressing. The first through hole 103 can match the setting of each battery cell and corresponds to the position of each battery cell. When a single battery cell in the battery cell stack 200 is out of control, the cooling and fire extinguishing medium can directly contact the out-of-control battery cell, achieving precise point cooling and fire extinguishing. The material of the hot melt film 108 can be independently selected according to the thermal runaway temperature of the battery cell. The material with a low melting point can be hot-melted in the early stage of thermal runaway, allowing the cooling and fire extinguishing medium to erupt in time and control the thermal runaway reaction at an early stage. When multiple batteries in different parts of the battery pack 300 are in thermal runaway, multiple hot melt films 108 melt, and the first channel 101 is still connected as a whole from front to back, and multiple thermal runaway batteries can be cooled at the same time. For example, when applied to ternary high-nickel batteries (such as 811 batteries), the normal operating temperature of the battery cell is <60°C, and the thermal runaway trigger temperature is 70°C~90°C, then EVA material (vinyl acetate copolymer, melting point 70°C~85°C) or low-temperature TPU hot melt adhesive film (polyurethane, melting point 60°C~80°C) can be selected. If used for battery cells with higher thermal runaway trigger temperatures (>100℃) such as lithium iron phosphate and sodium ion, TPU material (polyurethane, melting point 105℃~120℃) or PES material (copolyester, melting point: 115℃~125℃) can be selected.

[0038] When the second channel 102 is filled with a cooling and fire-extinguishing medium, such as a chemical gas fire extinguishing agent or a liquid for cooling, when a high temperature phenomenon occurs inside the battery (the temperature reaches a preset threshold), the hot-melt film 108 covering the first through hole 103 on the second channel 102 is melted and destroyed by the high temperature, and the substance poured into the second channel 102 can be sprayed at a fixed point to cool the battery cell with thermal runaway or extinguish the flame, thereby preventing the thermal runaway from spreading.

[0039] If the second channel 102 is used as an exhaust channel, when high temperature occurs inside the battery (the temperature reaches a preset threshold), the hot-melt film 108 covering the first through hole 103 on the second channel 102 will be melted and destroyed by the high temperature, and the high-temperature gas generated by the thermal runaway of the battery can be discharged through the second channel 102, thereby preventing the high-temperature gas from accumulating in the battery pack 300 and causing heat accumulation, which would bring the risk of thermal runaway spreading.

[0040] In summary, the liquid cooling plate 100 proposed in this embodiment can achieve high-temperature directional eruption or directional discharge of high-temperature gas, reducing the risk of thermal runaway of the battery; and the first channel 101 and the second channel 102 are integrated in the same liquid cooling plate 100, and there is no need to set up a separate coolant fire extinguishing pipeline in the battery pack 300. The structure is compact and the volume utilization rate is high, thereby improving the volume energy density of the battery. The number of liquid cooling pipeline components and connection parts inside the battery pack 300 is reduced, and the probability of leakage of the liquid cooling system and the cost of liquid cooling accessories are reduced.

[0041] In one embodiment, the temperature-reducing and fire-extinguishing medium is liquid, gas or powder.

[0042] In this embodiment, the temperature-reducing fire-extinguishing medium may include a liquid for cooling (ethylene glycol solution, silicone oil, etc.) or a chemical gas fire extinguishing agent or a powder fire extinguishing agent.

[0043] If the second channel 102 is filled with liquid, then under the normal state of the battery, it can assist the first channel 101 in having a stronger cooling effect on the battery cell. When high temperature occurs inside the battery (the temperature reaches a preset threshold), the hot-melt film 108 covering the first through hole 103 on the second channel 102 is melted and destroyed by the high temperature, and the liquid in the second channel 102 erupts at a fixed point to cool the triggered battery cell, thereby preventing the thermal runaway from spreading.

[0044] If the gas or powder filled in the second channel 102 is, for example, a chemical gas fire extinguishing agent or a dry powder fire extinguishing agent, wherein the dry powder fire extinguishing agent may include ammonium phosphate, ammonium sulfate, ammonium chloride, etc. The chemical gas fire extinguishing agent may preferably be an inert gas mixture, which is also called an IG series fire extinguishing agent, and currently mainly includes inert gases such as IG541, IG01, IG100, and IG55, wherein the digital codes represent the composition ratios of nitrogen, argon, and carbon dioxide, respectively. Among them, IG541 inert gas fire extinguishing agent is preferred. When thermal runaway occurs in one or more battery cells in the battery cell stack 200, the hot melt film 108 at the directional spray hole 103 is hot melted, and the chemical gas fire extinguishing agent can be directed and sprayed toward the thermal runaway battery cell, isolating the thermal runaway battery cell and oxygen, thereby preventing the spread of thermal runaway and achieving targeted fire extinguishing.

[0045] In one embodiment, the liquid cooling plate 100 further includes a first inlet 104 and a first outlet 106 , and the first inlet 104 and the first outlet are in communication with the interior of the first channel 101 .

[0046] In this embodiment, the first inlet 104 and the first outlet 106 are preferably provided on opposite sides of the length direction of the first channel 101. In addition, the positions of the first outlet 106 and the first inlet 104 may be designed according to the internal structure of the actual battery pack 300 for transmitting the coolant so that the liquid cooling plate 100 cools the battery cell through the coolant in the first channel 101.

[0047] In one embodiment, when the second channel 102 is filled with a cooling and fire-extinguishing medium, the second channel 102 is correspondingly provided with the liquid cooling plate 100 further including a second inlet 105 and a second outlet 107 , and the second inlet 105 and the second outlet 107 are connected to the inside of the second channel 102 .

[0048] In this embodiment, when the cooling fire extinguishing medium is poured into the second channel 102, it is preferred that the second channel 102 is provided with a second inlet 105 and a second outlet 107 on both sides along the length direction. The cooling fire extinguishing medium in the second channel can be circulated, and the second inlet can inject the cooling fire extinguishing medium into the second channel, and cooperate with the second outlet 107 to form a liquid or gas flow in the second channel. When the cooling fire extinguishing medium is liquid, the circulating flow can bring daily cooling to the battery cell and take away the heat; if the cooling fire extinguishing medium is gas or powder, the second inlet can also be used as a connection port with other channels to form a gas connection inside the entire battery, which is convenient for forming a structural connection and improving the assembly convenience of the structure. In addition, the position design of the second outlet 107 and the second inlet 105 can also be carried out according to the internal structure of the actual battery pack 300, for transmitting the flowing cooling fire extinguishing medium.

[0049] In one embodiment, when the second channel 102 is used as an exhaust channel, an exhaust port is provided on the second channel 102 , and a one-way solenoid valve is provided on the exhaust port for receiving a thermal runaway signal to open and close the exhaust.

[0050] In this embodiment, when the second channel 102 is used as an exhaust channel, an exhaust port is provided on one side of the second channel 102 along the length direction, and the exhaust port is connected to the inside of the second channel 102 as an outlet for high-temperature gas, and a one-way solenoid valve is provided inside the exhaust port, and the one-way solenoid valve is controlled by the thermal runaway warning signal of the battery pack 300. When a certain piece or multiple cells in the battery pack 300 have thermal runaway, the local high temperature causes the hot melt film 108 on the first through hole 103 on the second channel 102 near the triggering cell to melt. At the same time, the thermal runaway warning signal of the battery pack 300 is issued, and the one-way solenoid valve at the exhaust port at the outer end of the battery pack 300 is opened. As a result, the entire first through hole 103 is connected to the outside, and the high-temperature gas generated by the triggering cell is discharged to the second channel 102 through the first through hole 103 on the liquid cooling plate 100, and then discharged to the outside of the battery pack 300. The high-temperature gas generated by the triggering cell does not directly contact the cell, which reduces the heat conduction to the normal cell, thereby reducing the risk of thermal runaway diffusion. At the same time, the combustible gas generated by the thermal runaway of the battery cell is discharged out of the battery pack 300 in time and will not accumulate in the battery pack 300, thereby reducing the possibility of explosion and deflagration.

[0051] In one embodiment, when the second channel 102 is filled with a cooling and fire-extinguishing medium, the design flow range of the first channel 101 is 10 L / min-20 L / min, and the design flow range of the second channel 102 is 2 L / min-5 L / min.

[0052] In this embodiment, when the second channel 102 is filled with a cooling and fire-extinguishing medium, the flow cross-sectional area of ​​the first channel 101 is larger than that of the second channel 102. The design flow range of the first channel 101 is 10L / min-20L / min, and the specific range selection can be designed according to the thermal management requirements of the battery pack 300 and the simulation results. The flow channel is filled with a cooling medium (commonly used is ethylene glycol solution), which is used for thermal management (cooling and heating) during the normal operation of the battery pack 300. The design flow range of the second channel 102 is 2L / min-5L / min, and the specific range selection can be designed according to the cooling and fire-extinguishing simulation results. The second channel 102 is filled with a cooling and fire-extinguishing medium. When the high temperature causes the hot melt film 108 on the first through hole 103 to melt, the cooling and fire-extinguishing substance is continuously ejected through the first through hole 103 at a flow rate of 2L / min-5L / min, continuously cooling and extinguishing the thermal runaway battery cell. To avoid excessive flow, the cooling and fire-extinguishing substances are excessively deposited at the bottom of the battery pack 300 in a short time, thereby reducing the secondary risk of short circuit caused by excessive deposition of cooling and fire-extinguishing substances at the bottom of the battery pack 300.

[0053] In one embodiment, a supporting and guiding boss 110 is disposed on the liquid cooling plate 100 corresponding to the first channel 101 .

[0054] In this embodiment, it is preferred that a support and guide boss is provided at the widest cross-sectional area portion of the liquid cooling plate on the side close to the battery holder corresponding to the first channel 101. The support and guide boss may include one or more, which can further improve the structural strength of the liquid cooling plate 100, improve the deformation resistance of the liquid cooling plate 100, make the liquid cooling plate 100 not easily deformed under vibration, impact and collision conditions, and further reduce the risk of cooling medium leakage.

[0055] In one embodiment, the first channels 101 include a plurality of first channels 101, which are spaced apart in sequence along the width direction of the liquid cooling plate 100 on the inner wall of one side of the liquid cooling plate 100 close to the battery cell stack 200, a first spacing area 111 is formed between each of the first channels 101, and a first gap 112 is formed between the first channel 101 and one side of the liquid cooling plate 100 in the width direction, and a plurality of the first spacing areas are connected to the first gap to form the second channel 102; the first through holes 103 are provided on one side of the liquid cooling plate 100 corresponding to the first spacing areas and the first gaps.

[0056] like Fig. 9As shown, in this embodiment, the manufacturing process of the liquid cooling plate 100 is changed from sheet metal welding to profile aluminum extrusion, and the process is simpler and convenient for production. The first channel 101 includes a plurality of first channels 101, which are sequentially spaced and distributed along the width direction of the liquid cooling plate 100 on the inner wall of the liquid cooling plate 100 on the side close to the battery cell stack 200. Since the first channels are spaced and distributed, a first spacing area 111 is formed between each first channel, and a preset spacing is reserved between the first channel 101 and the inner wall of one side in the width direction of the liquid cooling plate 100, and the spacing forms a first gap 112. In addition to the first channel 101 that has been set inside the liquid cooling plate 100, a plurality of first spacing areas and the first gap are connected to the spacing between the inner wall on the other side (the inner wall on the side away from the battery cell stack 200), forming a second channel 102. Since the first channel 101 is mainly arranged on the inner wall on the side close to the battery cell stack, the first channel 101 and the second channel 102 are both independent of each other and increase the contact area between the two, thereby improving the cooling efficiency. At the same time, the distribution of the flow channels is more uniform, which improves the uniformity of the temperature field of the battery cell stack 200. The flow channel structure is more compact, which further improves the volume utilization rate.

[0057] like Figure 8 As shown, in this embodiment, the first through holes 103 are provided on one side of the liquid cooling plate 100 corresponding to the first spacing area and the first gap. On the side close to the battery cell stack 200, rows of first through holes 103 are evenly distributed, and these through holes are all provided at the positions corresponding to the first spacing area and the first gap, and can directly spray the cooling and fire extinguishing medium in the second channel 102 to the corresponding battery cell, or serve as an exhaust channel to discharge high-temperature gas.

[0058] In one embodiment, the first channels 101 include a plurality of first channels 101, which are sequentially spaced apart along the width direction of the liquid cooling plate 100 on the inner walls on both sides in the thickness direction of the liquid cooling plate 100, a second spacing area 201 is formed between the first channels 101 on each side, and a designated spacing is left between the first channels 101 on both sides; the first channels 101 on both sides are spaced apart from one side in the width direction of the liquid cooling plate 100 by a second gap 202, and the second gap 202 is connected with the second spacing area 201 and the designated spacing to form the second channel 102.

[0059] like Fig.10As shown, the first channels 101 include a plurality of them, which are evenly spaced and distributed on the inner walls of the opposite sides of the liquid cooling plate 100, and a second spacing area 201 is formed between the first channels 101 on each side, and a specified spacing is left between the first channels 101 on both sides; the first channels 101 on both sides are separated from one side of the liquid cooling plate 100 in the width direction to form a second gap 202, and the second gap 202 is connected with the second spacing area 201 and the specified spacing to form the second channel 102. Since both sides of the liquid cooling plate have corresponding second channels 102, that is, both sides of the liquid cooling plate have first channels 101 and second channels 102, which can meet the cooling under normal conditions and the requirements of cooling and extinguishing fire or discharging high-temperature gas during thermal runaway, so a liquid cooling plate 100 can be directly set between the battery cell stacks 200 to simultaneously perform thermal management and thermal runaway fixed-point cooling and fire extinguishing for the battery cell stacks 200 on both sides. At the same time, the structural strength of the integrated liquid cooling plate 100 is improved, and it can be used as the lower crossbeam of the battery pack box to fix the battery cell stack 200. Since the original lower crossbeam of the box is eliminated, the volume utilization rate of the battery pack and the system integration rate are further improved, and the volume energy density of the battery pack is improved.

[0060] In one embodiment, the first channel 101 and the second channel 102 are linear channels.

[0061] In this embodiment, since the first channel 101 and the second channel 102 are linear channels, they can be integrally extruded by aluminum extrusion, which simplifies the manufacturing process and is more convenient for industrial production.

[0062] In one embodiment, the first through holes 103 are disposed on the liquid cooling plate 100 corresponding to the first spacing area and the first gap.

[0063] In this embodiment, the first through hole 103 is provided on the liquid cooling plate 100 corresponding to the first spacer and the first gap. Since the first spacer and the first gap are provided on opposite sides of the liquid cooling plate 100, the first through holes 103 are provided on both sides. When installed inside the battery, the battery cell stacks 200 on both sides can be cooled and protected to prevent heat diffusion and safety hazards caused by thermal runaway.

[0064] In one embodiment, a battery pack 300 is proposed, comprising the liquid cooling plate 100 described in any one of the above embodiments, and also comprising a box body, in which a plurality of battery cell stacks 200 are arranged, and the liquid cooling plate 100 is arranged between the battery cell stacks 200 .

[0065] In this embodiment, the battery pack 300 includes a box body, in which a plurality of battery cell stacks 200 are arranged, and the liquid cooling plate 100 is arranged between the battery cell stacks 200. The liquid cooling plate 100 may be provided with first through holes 103 on opposite sides close to the battery cell stacks 200, so as to simultaneously perform thermal management and thermal runaway fixed-point cooling and fire extinguishing for the battery cell stacks 200 on both sides. At the same time, the liquid cooling plate 100 also serves as the lower crossbeam of the battery pack 300 box body, and is used to fix the battery cell stacks 200. Since the original lower crossbeam of the box body is eliminated, the volume utilization rate and system integration rate of the battery pack 300 are further improved, and the volume energy density of the battery pack 300 is improved. It is also possible that two liquid cooling plates 100 are respectively fixed on both sides of the battery bracket to cool and protect the battery cell stacks on both sides respectively.

[0066] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A liquid cooling plate, characterized in that: The liquid cooling plate is provided with a first channel and a second channel which are independent of each other; the first channel is used to contain the coolant; a plurality of first through holes are provided on the outer wall of the second channel on one side close to the battery cell stack, and the surface of the first through holes is correspondingly covered with a hot-melt film. When the hot-melt film melts, if the second channel is filled with a cooling and fire-extinguishing medium, the first through holes are used to spray the cooling and fire-extinguishing medium; if the second channel is used as an exhaust channel, the high-temperature gas generated in the battery cell stack enters the second channel through the first through holes and is discharged.

2. The liquid cooling plate according to claim 1, characterized in that: The first channel and the second channel are located on the same side of the liquid cooling plate, and the second channel forms a "J"-shaped bend in the direction of the first channel every time it extends a specified distance, and the "J"-shaped bend matches the height of the battery cell stack. The first through hole is arranged on the curved surface of the "J"-shaped bend and is arranged corresponding to the position of the battery cell monomer in the battery cell stack stacked in the width direction of the liquid cooling plate.

3. The liquid cooling plate according to claim 1, characterized in that: The cooling and fire extinguishing medium is liquid, gas or powder.

4. The liquid cooling plate according to claim 1, characterized in that: When the second channel is filled with a cooling and fire-extinguishing medium, a second inlet and a second outlet are correspondingly provided on the second channel, and the second inlet and the second outlet are connected to the interior of the second channel; when the second channel is used as an exhaust channel, an exhaust port is provided on the second channel, and a one-way solenoid valve is provided on the exhaust port for receiving a thermal runaway signal to open and close the exhaust.

5. The liquid cooling plate according to claim 1, characterized in that: When the second channel is filled with cooling and fire extinguishing medium, the flow range of the first channel is 10L / min-20L / min; the flow range of the second channel is 2L / min-5L / min, and when the hot melt film is hot-melted, the cooling and fire extinguishing medium will continue to spray through the first through hole at a flow rate of 2L / min-5L / min.

6. The liquid cooling plate according to claim 1, characterized in that: The liquid cooling plate corresponding to the first channel is provided with a supporting and flow guiding boss.

7. The liquid cooling plate according to claim 1, characterized in that: The first channels include a plurality of first channels, which are spaced apart in sequence along the width direction of the liquid cooling plate on the inner wall of the liquid cooling plate on one side close to the battery cell stack, a first spacing area is formed between each of the first channels, and a first gap is formed between the first channel and one side of the liquid cooling plate in the width direction, and a plurality of the first spacing areas are connected to the first gap to form the second channel; the first through holes are provided on the liquid cooling plate corresponding to the first spacing areas and the first gaps.

8. The liquid cooling plate according to claim 1, characterized in that: The first channels include a plurality of first channels, which are spaced in sequence along the width direction of the liquid cooling plate on the inner walls on both sides in the thickness direction of the liquid cooling plate, a second spacing area is formed between the first channels on each side, and a designated spacing is left between the first channels on both sides; the first channels on both sides are separated from one side in the width direction of the liquid cooling plate by a second gap, and the second gap is connected with the second spacing area and the designated spacing to form the second channel.

9. The liquid cooling plate according to claim 8, characterized in that: The first through hole is disposed on the liquid cooling plate corresponding to the second spacing area and the second gap.

10. The liquid cooling plate according to any one of claims 8 to 9, characterized in that: The first channel and the second channel are linear channels.

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