Electric energy storage device with liquid cooling plate arranged on top

Abstract

The utility model discloses a liquid cooling plate top-mounted electric energy storage device, and relates to the field of energy storage, the liquid cooling plate top-mounted electric energy storage device comprises a box body, an upper liquid cooling cover plate and an energy storage battery pack, and the box body and the upper liquid cooling cover plate are matched to form an energy storage bin; the energy storage battery pack is installed in the energy storage bin and is in contact fit with the upper liquid cooling cover plate, and contact with the batteries in the energy storage bin is achieved through the upper liquid cooling cover plate. A plurality of heat-conducting fins used for connecting the liquid cooling cover plate with the side wall of the energy storage battery pack for heat conduction are arranged in the energy storage bin; the upper liquid cooling cover plate comprises a flame-retardant layer, a liquid storage layer, a structural layer, a heat insulation layer and a cooling layer from top to bottom, and a plurality of cooling runners are arranged in the cooling layer; and the liquid storage layer is provided with a liquid storage bin which is horizontally arranged. According to the energy storage device, the defects of a traditional underneath type liquid cooling plate are overcome, the more efficient heat dissipation effect and the more reliable safety performance are provided, and meanwhile the fireproof performance is further improved through the design of the flame-retardant layer.

Description

Technical Field

[0001] The present application relates to the field of energy storage, and particularly to a liquid-cooled plate upper-mounted electric energy storage device. Background Art

[0002] In the prior art, the liquid-cooled plate plays a crucial role in the thermal management of electric energy storage devices. Especially in the field of electric vehicles, the design and layout of the liquid-cooled plate directly affect the heat dissipation effect and safety performance of the battery. The traditional liquid-cooled plate usually adopts a lower-mounted design, that is, the liquid-cooled plate is installed below the battery pack to enhance heat dissipation by utilizing gravity and natural convection effects. However, this lower-mounted design has some significant deficiencies, especially in terms of safety in the face of extreme situations such as battery pack fires.

[0003] First of all, when the battery pack catches fire, the traditional lower-mounted liquid-cooled plate cannot effectively block the upward spread of the flame. Once the battery pack catches fire, the flame will quickly spread upward, directly threatening the safety of the passengers in the vehicle and significantly shortening the escape time. In addition, the traditional lower-mounted liquid-cooled plate is located at the bottom of the battery pack and is easily damaged by collisions at the bottom of the vehicle or road obstacles, which further reduces its reliability and safety in emergency situations.

[0004] Secondly, the heat dissipation effect of the traditional liquid-cooled plate is restricted to a certain extent by the layout position. Although the lower-mounted design can enhance heat dissipation through natural convection, when the vehicle is traveling at high speed, due to aerodynamic effects, the bottom airflow may be disturbed, resulting in unstable heat dissipation effects. In addition, since the traditional liquid-cooled plate does not have a special flame-retardant design, when the battery pack has a thermal runaway phenomenon, the liquid-cooled plate itself may become a path for the spread of the flame, increasing the fire risk.

[0005] In view of the above problems, it is of great significance to develop a liquid-cooled plate upper-mounted electric energy storage device. Summary of the Utility Model

[0006] The purpose of the present application is to at least overcome at least one deficiency existing in the prior art, and provide a liquid-cooled plate upper-mounted electric energy storage device. This energy storage device not only overcomes the deficiencies of the traditional lower-mounted liquid-cooled plate, provides more efficient heat dissipation effects and more reliable safety performance, but also further improves the fire prevention performance through the design of the flame-retardant layer.

[0007] To achieve the above-mentioned objectives, the present application discloses a liquid-cooled plate-mounted electric energy storage device, comprising a box body, an upper liquid-cooled cover plate, and an energy storage battery pack, wherein the box body and the upper liquid-cooled cover plate cooperate to form an energy storage bin; the energy storage battery pack is installed in the energy storage bin and contacts and cooperates with the upper liquid-cooled cover plate, and the batteries in the energy storage bin are contacted and cooled via the upper liquid-cooled cover plate; the energy storage bin is provided with a plurality of heat-conducting plates for connecting the liquid-cooled cover plate and the side walls of the energy storage battery pack for heat conduction; the upper liquid-cooled cover plate comprises, from top to bottom, a flame-retardant layer, a liquid storage layer, a structural layer, an insulating layer, and a cooling layer, wherein the cooling layer is provided with a plurality of cooling channels; the liquid storage layer has a horizontally arranged liquid storage bin.

[0008] Furthermore, a thermally conductive silica gel layer is provided between the cooling layer and the energy storage battery pack.

[0009] Furthermore, the several cooling channels in the cooling layer are connected to a liquid inlet and a liquid outlet, the liquid inlet is connected to an external liquid cooling device through a pipeline, and the liquid outlet is connected to a liquid storage tank in the liquid storage layer; the liquid storage tank has a second liquid outlet, which is connected to an external liquid cooling device.

[0010] Furthermore, a plurality of water outlets sealed by rubber blocks are provided between the liquid storage bin of the liquid storage layer and the heat insulation layer.

[0011] Compared with the prior art, this application has at least one of the following beneficial effects:

[0012] 1. Improved safety: The top-mounted design and flame-retardant layer can effectively prevent the flames from spreading upwards. When the battery pack catches fire, it buys valuable escape time for the occupants and significantly improves the safety of electric vehicles.

[0013] 2. Enhanced heat dissipation: The upper liquid-cooled cover is in direct contact with the energy storage battery pack, achieving efficient heat conduction and heat dissipation through a thermally conductive sheet and thermally conductive silicone layer. Cooling channels within the cooling layer are connected to an external liquid cooling device, ensuring effective coolant circulation and maintaining the battery pack temperature within a safe range.

[0014] 3. Optimized space utilization: The top-mounted liquid cooling plate design optimizes the internal space layout of the energy storage device, reduces the complexity caused by installation and maintenance, improves overall performance and service life, and facilitates the maintenance and replacement of the liquid cooling plate.

[0015] The above-listed beneficial effects are not exhaustive and other potential beneficial effects and detailed technical implementations will be further disclosed in the examples or other description sections of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] After reading the following detailed description in conjunction with the accompanying drawings, various aspects of the present disclosure will be better understood. In the drawings, the positions, dimensions, ranges, etc. of the various structures shown sometimes do not represent the actual positions, dimensions, ranges, etc. In the drawings:

[0017] Figure 1 is a schematic diagram of the overall structure in an embodiment disclosed in the present application. The upper liquid cooling cover plate in the figure is in a disassembled state.

[0018] Figure 2 is a schematic diagram of the overall structure from another perspective in an embodiment disclosed in the present application. The upper liquid cooling cover plate in the figure is in a disassembled state.

[0019] Figure 3 is a schematic diagram of the overall structure from yet another perspective in an embodiment disclosed in the present application. The upper liquid cooling cover plate in the figure is in a disassembled state.

[0020] Figure 4 is an exploded view of the structure from one perspective in an embodiment disclosed in the present application.

[0021] Figure 5 is an exploded view of the structure from another perspective in an embodiment disclosed in the present application.

[0022] Figure 6 is a schematic diagram of the structure of the liquid storage layer and the cooling layer in cooperation in an embodiment disclosed in the present application.

[0023] Figure 7 is a schematic diagram of the internal structure in a disassembled state after the liquid storage layer and the cooling layer are in cooperation in an embodiment disclosed in the present application. Detailed Description

[0024] The present disclosure will be described below with reference to the accompanying drawings, in which several embodiments of the present disclosure are shown. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below. In fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and fully explain the protection scope of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.

[0025] It should be understood that in all the drawings, the same reference numerals represent the same elements. In the drawings, for clarity, the dimensions of some features may be deformed.

[0026] It should be understood that the terms in the specification are only used to describe specific embodiments and are not intended to limit the present disclosure. All terms used in the specification (including technical terms and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of brevity and / or clarity, technologies, methods, and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification.

[0027] The singular forms "a", "the", and "said" used in the specification include the plural forms unless clearly specified. The terms "comprising", "including", and "containing" used in the specification indicate the presence of the claimed features, but do not exclude the presence of one or more other features. The term "and / or" used in the specification includes any and all combinations of one or more of the related listed items.

[0028] As Figure 1-7 shown, this embodiment discloses an exemplary structure for achieving the technical purpose of the present application, specifically a liquid-cooled plate upper-mounted electric energy storage device, which aims to improve the heat dissipation effect and safety performance of the battery pack.

[0029] In terms of structural composition, the device mainly consists of a box body 1, an upper liquid-cooled cover plate 2, and an energy storage battery pack 3. The box body 1 and the upper liquid-cooled cover plate 2 cooperate to form a closed energy storage bin 4. The energy storage battery pack 3 is installed in the energy storage bin 4 and is in contact with the upper liquid-cooled cover plate 2, and direct cooling of the energy storage battery pack 3 in the energy storage bin 4 is achieved through the upper liquid-cooled cover plate 2. A number of heat conducting sheets 5 for connecting the liquid-cooled cover plate 2 and the side wall of the energy storage battery pack 3 for heat conduction are also provided in the energy storage bin 4.

[0030] The box body 1 is made of high-strength aluminum alloy or stainless steel, is in a cuboid shape, and is hollow inside to accommodate the energy storage battery pack 3. The top of the box body 1 is provided with a flange edge, which is fixedly connected to the upper liquid-cooled cover plate 2 by bolts to form a sealed energy storage bin 4. The design of the box body 1 ensures the overall strength and stability of the device and provides a closed environment for protecting the battery pack. The inner surface of the box body 1 is coated with an anti-corrosion coating to enhance its durability and anti-corrosion performance and ensure reliability during long-term use.

[0031] The upper liquid-cooled cover plate 2 sequentially includes a flame-retardant layer 201, a liquid storage layer 202, a structural layer 203, a heat insulation layer 204, and a cooling layer 205 from top to bottom. Each layer is fixedly connected by a high-strength adhesive or mechanical connectors (such as bolts or rivets) to ensure that each layer is closely fitted and not easily loosened. The specific structure and connection relationship of each layer are as follows:

[0032] The flame-retardant layer 201 is made of fireproof materials such as asbestos or flame-retardant fiber composites, with a thickness of about 2 - 5 mm, and is used to prevent the upward spread of flames. The surface of the flame-retardant layer 201 has been specially treated to improve its fire resistance and mechanical strength, ensuring that it can still play an effective fireproof role under high-temperature conditions. The flame-retardant layer 201 is fixedly connected to the liquid storage layer 202 through a high-temperature resistant adhesive, ensuring good bonding performance under high-temperature environments.

[0033] The liquid storage layer 202 is made of high-temperature resistant materials such as high-temperature durable polymers or metal composites, and is internally provided with a horizontally arranged liquid storage bin 207 for storing coolant. The volume of the liquid storage bin 207 is designed according to the cooling requirements, and its inner surface is smooth to reduce the retention of coolant. It is also provided with a liquid inlet 208 and a second liquid outlet 209 for connecting to external liquid cooling devices to achieve the recycling of coolant. The liquid storage layer 202 is fixedly connected to the structural layer 203 through bolts and high-strength adhesives, ensuring that the liquid storage layer 202 does not deform or loosen when bearing the weight of the coolant.

[0034] The structural layer 203 is made of high-strength metal materials such as aluminum alloy or stainless steel, with a thickness of about 5 - 10 mm, enhancing the mechanical strength and stability of the cover plate. The design of the structural layer 203 takes into account the bearing capacity and anti-deformation performance of the cover plate, ensuring that it can still maintain its structural integrity under high-intensity working environments. The structural layer 203 is fixed to the heat insulation layer 204 through mechanical connectors (such as rivets or bolts), ensuring the close fit between the layers under high-temperature environments.

[0035] The heat insulation layer 204 is made of high-efficiency heat insulation materials such as ceramic fibers or porous silicates, with a thickness of about 3 - 7 mm, and is used to prevent heat conduction to other layers. The material selection of the heat insulation layer 204 has excellent heat insulation performance and durability, and can effectively block heat conduction to protect the energy storage battery pack 3 from the influence of high temperature. The heat insulation layer 204 is fixed to the cooling layer 205 through high-temperature resistant adhesives and bolts, ensuring that it can still maintain a tight connection under extreme high-temperature conditions.

[0036] The cooling layer 205 is made of metal materials with high thermal conductivity such as copper or aluminum alloy, with a thickness of about 2 - 5 mm, and is internally provided with a number of cooling channels 206. These channels are designed in a serpentine or spiral shape to increase the flow path of the coolant and enhance the cooling effect. The cooling channels 206 are connected to the liquid inlet 208 and the liquid outlet 209 to ensure the continuous inflow and outflow of the coolant in the cooling layer 205. The design of the cooling layer 205 takes into account the flow resistance of the coolant and the heat dissipation effect, ensuring the best cooling performance within the shortest path. The cooling layer 205 is fixedly connected to the structural layer 203 through bolts and adhesives to ensure its stability under high-temperature and high-pressure conditions.

[0037] To enhance the heat conduction effect, a thermal conductive silicone layer 6 is provided between the cooling layer 205 and the energy storage battery pack 3. The thermal conductive silicone layer 6 is made of a silicone material with a high thermal conductivity coefficient, has excellent thermal conductivity and flexibility, and can closely adhere to the surface of the energy storage battery pack 3 to ensure that heat is quickly conducted to the cooling layer 205. The material selection and thickness design of the thermal conductive silicone layer 5 ensure good heat conduction effects under different temperatures and working conditions.

[0038] The cooling flow channels 206 in the cooling layer 205 are connected to the liquid inlet 208 and the liquid outlet 209. The liquid inlet 208 is connected to an external liquid cooling device (not shown in the figure) through a pipeline to ensure that the coolant continuously flows into the cooling layer 205. The liquid outlet 209 is connected to the liquid storage bin 207 in the liquid storage layer 202. The coolant enters the liquid storage bin 207 for storage and circulation after flowing through the cooling layer 205. The liquid storage bin 207 is also provided with a second liquid outlet 212, which is connected to the external liquid cooling device through the second liquid outlet 212 to realize the recycling of the coolant.

[0039] To prevent coolant leakage, a number of liquid outlets 210 are provided between the liquid storage bin 207 of the liquid storage layer 202 and the heat insulation layer 204. These liquid outlets 210 are sealed by rubber blocks 211. The rubber blocks 211 are made of high-temperature silicone rubber and have good sealing performance and high-temperature resistance, ensuring that the coolant will not leak in a high-temperature environment and further improving the safety and reliability of the device. The selection of the rubber blocks 211 is based on their stability and sealing effect in different temperature ranges to ensure the long-term stable operation of the cooling system.

[0040] During the working process, the heat generated by the energy storage battery pack 3 is conducted to the cooling layer 205 through the heat conduction sheet 5 and the thermal conductive silicone layer 6. The coolant circulates in the cooling flow channels 206 to take away the heat of the energy storage battery pack 3. The coolant flows into the cooling layer 205 through the liquid inlet 208, flows out through the liquid outlet 209 and enters the liquid storage bin 207 of the liquid storage layer 202, and finally flows back to the external liquid cooling device through the second liquid outlet 209 to realize the recycling of the coolant. The design of the entire cooling system ensures the stable flow and efficient heat dissipation effect of the coolant under different working conditions.

[0041] In case of an emergency, such as a failure or fire in the energy storage battery pack 3, the high temperature will be rapidly conducted to the cooling layer 205. The coolant absorbs heat and delays the spread of the fire. When the temperature continues to rise, the rubber block 211 melts, and the coolant in the liquid storage chamber 207 flows into the energy storage chamber 4 through the water outlet 210, directly contacting the burning energy storage battery pack 3. These coolants can quickly absorb heat, significantly reduce the temperature on the surface of the battery pack, and delay the spread of the fire. In the case of a minor fire, the coolant may extinguish the fire. Even in a large fire, it can significantly lower the temperature, delay the development of the fire, reduce the risk of the flame spreading to other parts of the electric vehicle, and win precious time for handling and escape. The specific emergency handling process is as follows:

[0042] Initial stage: When the temperature inside the energy storage battery pack 3 rises abnormally, the coolant in the cooling layer 205 first absorbs and takes away part of the heat. The coolant circulates in the cooling flow channel 206 and is connected to the external liquid cooling device through the liquid inlet 208 and the liquid outlet 209 to ensure the continuous flow of the coolant and heat exchange.

[0043] Mid-stage: If the temperature continues to rise and reaches the tolerance limit of the material of the cooling layer 205, the high thermal conductivity metal material (such as copper or aluminum alloy) of the cooling layer 205 will rapidly conduct the heat to other layers of the upper liquid cooling cover plate 2, especially the structural layer 203 and the heat insulation layer 204. The structural layer 203 is made of high-strength metal material (such as aluminum alloy or stainless steel), which can withstand high temperature in a short time, but will gradually lose its strength when exposed to extremely high temperature for a long time and may be burned through.

[0044] Emergency stage: When the high temperature continues to spread upward to the liquid storage layer 202, the rubber block 211 inside the liquid storage layer 202 will start to melt. After the rubber block 211 melts, the coolant in the liquid storage chamber 207 flows into the energy storage chamber 4 through the water outlet 210. Since the design of the liquid storage layer 202 can store more coolant, this process can last for a long time to ensure that there is enough coolant for fire extinguishing and temperature reduction in case of an emergency.

[0045] Temperature reduction and fire extinguishing: After the coolant flows into the energy storage chamber 4, it directly contacts the burning energy storage battery pack 3. These coolants can quickly absorb heat, significantly reduce the temperature on the surface of the battery pack, and delay the spread of the fire. In the case of a minor fire, the coolant may extinguish the fire. Even in a large fire, it can significantly lower the temperature, delay the development of the fire, reduce the risk of the flame spreading to other parts of the electric vehicle, and win precious time for handling and escape.

[0046] Heat insulation protection: The heat insulation layer 204 plays a crucial role throughout the process. Even if the fire has burned through the cooling layer 205 and the structural layer 203, the heat insulation layer 204 can still prevent heat conduction to the uppermost layer of the upper liquid cooling cover plate 2 and other parts of the vehicle for a certain period of time. This delaying effect buys valuable time for passengers to escape and for fire-fighting measures.

[0047] Through the above detailed description of the structural design and working principle, this liquid-cooled plate upper-mounted electric energy storage device can not only dissipate heat efficiently during daily operation, but also provide additional safety protection measures in case of emergency, ensuring the safety and reliability of electric vehicles or other similar devices.

[0048] Although exemplary embodiments of the present disclosure have been described, those skilled in the art should understand that various changes and modifications can be made to the exemplary embodiments of the present disclosure without departing from the spirit and scope of the present disclosure in essence. Therefore, all changes and modifications are included within the protection scope of the present disclosure defined by the claims. The present disclosure is defined by the appended claims, and equivalents of these claims are also included.

Claims

1. A liquid-cooled plate upper-mounted electric energy storage device, characterized in that Including: A box body, an upper liquid-cooling cover plate, and an energy storage battery pack. Among them, the box body and the upper liquid-cooling cover plate cooperate to form an energy storage bin; the energy storage battery pack is installed in the energy storage bin and is in contact and cooperation with the upper liquid-cooling cover plate, and the battery in the energy storage bin is cooled by contacting the upper liquid-cooling cover plate; several heat-conducting sheets for conducting heat between the liquid-cooling cover plate and the side wall of the energy storage battery pack are arranged in the energy storage bin; the upper liquid-cooling cover plate successively includes a flame-retardant layer, a liquid storage layer, a structural layer, a heat-insulating layer, and a cooling layer from top to bottom. Among them, several cooling channels are arranged in the cooling layer; the liquid storage layer has a horizontally arranged liquid storage bin; several cooling channels in the cooling layer are connected to a liquid inlet and a liquid outlet. The liquid inlet is connected to an external liquid-cooling device through a pipeline, and the liquid outlet is connected to the liquid storage bin in the liquid storage layer; the liquid storage bin has a second liquid outlet, and the second liquid outlet is connected to the external liquid-cooling device; several water outlets sealed by rubber blocks are arranged between the liquid storage bin of the liquid storage layer and the heat-insulating layer.

2. The liquid-cooled plate upper-mounted electric energy storage device according to claim 1, wherein: A heat-conducting silica gel layer is arranged between the cooling layer and the energy storage battery pack.

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