Immersed battery thermal management system

Abstract

The utility model discloses an immersed battery thermal management system which comprises a battery, a columnar shell internally provided with a battery pack, and a spiral pipe liquid flow channel wrapped outside the battery pack, the two ends of the columnar shell are sealed by flange end sockets, a closed cavity is formed in the columnar shell and filled with cooling liquid, and the flange end sockets are provided with a liquid inlet pipeline, a liquid outlet pipeline and a wiring port. The spiral pipe liquid flow channel is soaked in cooling liquid, the outer edge of the spiral pipe liquid flow channel is in direct contact with the inner wall of the columnar shell, and the inner edge of the spiral pipe liquid flow channel is a battery pack placing space; the battery pack is formed by connecting a plurality of single batteries in series and in parallel, and the periphery of each single battery is coated with a sealant coating; according to the battery heat management system, heat transfer between a battery and the external environment is achieved through heat convection, and therefore heat exchange is achieved; according to the utility model, the cooling effect of the power battery is improved by utilizing a flow heat exchange mode, and the device is different from a traditional large-scale immersed liquid cooling device, and the lightweight design in the power battery design is highlighted.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal management, and particularly relates to an immersion-type battery thermal management system. Background Technique

[0002] Currently, the main battery thermal management technologies applied in the industry are air cooling, liquid cooling, phase change material cooling, and heat pipe cooling. Among them, the air cooling and liquid cooling methods have developed the fastest, and their technologies are quite perfect and have been applied to multiple industries related to power batteries. Although air cooling can have a certain control effect on the battery temperature, with the continuous increase in the demand for battery energy density, its heat generation also rises linearly, and air cooling can no longer meet the temperature control requirements. The liquid cooling method enables the power battery to be in direct contact with the coolant and absorbs the heat generated by the battery through the form of convective heat transfer. Even at high battery energy densities, it can effectively control the battery temperature. Among them, the immersion cooling technology, as one of the liquid cooling methods, has developed rapidly due to its good cooling performance and high safety.

[0003] According to whether the cooling medium undergoes a phase change, the immersion cooling can be divided into: single-phase immersion cooling and two-phase immersion cooling. In the two-phase cooling method, the coolant undergoes a phase change during the heat release process of the battery, and the phase change heat absorption is used to improve the heat transfer efficiency. However, the pressure changes during the phase change process, which has certain requirements for the container, and the coolant will also be contaminated due to the phase change. The single-phase cooling method does not rely on the phase change and only absorbs heat from the battery through the convective heat transfer method. It has high requirements for the boiling point of the coolant, and the heat transfer efficiency is not as good as that of the two-phase cooling. However, the volatilization and loss of the coolant are better controlled, and the requirements for the equipment are relatively low. It can be seen that the two methods have their own advantages and disadvantages. In order to improve the cooling performance of the immersion cooling technology, strengthening the coolant flow channel structure is an effective and reasonable measure. Therefore, this application proposes a lightweight immersion-type battery thermal management system using a screw-type liquid flow channel. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the defects and deficiencies of the prior art and provide an immersion-type battery thermal management system, and solve the problems proposed in the above background technique through a spiral tube liquid flow channel.

[0005] The purpose of the utility model is realized through the following technical solutions:

[0006] An immersion battery thermal management system includes a battery, and also includes a columnar housing with a built-in battery pack and a spiral tube liquid flow channel wrapped around the battery pack; both ends of the columnar housing are sealed by flange end caps, a closed cavity is formed inside and filled with a coolant, and the flange end caps are respectively provided with a liquid inlet pipe, a liquid outlet pipe, and a wiring port; the spiral tube liquid flow channel is immersed in the coolant, its outer edge is in direct contact with the inner wall of the columnar housing, and its inner edge is the placement space for the battery pack; the battery pack is formed by connecting several single cells in series and parallel, and a layer of sealant coating is wrapped around each single cell; the battery thermal management system uses convective heat transfer to achieve heat transfer between the battery and the external environment, thereby exchanging heat.

[0007] Further, the spiral tube liquid flow channel is filled with a coolant. By changing the flow path of the coolant in the spiral tube liquid flow channel, a centrifugal force is generated to form a secondary flow, disturbing the coolant in the columnar housing, thereby breaking the liquid boundary layer formed between the coolant and the battery surface, achieving enhanced convective heat transfer.

[0008] Further, the spiral tube liquid flow channel is a flat spiral rod, the cylindrical space of its inner edge provides support for the battery, and the left and right ends of the spiral tube liquid flow channel are respectively connected to the liquid inlet pipe and the liquid outlet pipe.

[0009] Further, the single cells of the battery pack are connected in series and parallel in sequence, and the left and right ends are connected to the wiring port through wires to output electrical energy.

[0010] Further, the flange end cap and the columnar housing form a combined body through a sealing bolt, and a sealing gasket is arranged between the flange end cap and the sealing bolt.

[0011] As a preferred solution, the coolant in the columnar housing and the coolant in the spiral tube liquid flow channel adopt an electronic fluorinated liquid with low viscosity, high boiling point, and no volatility.

[0012] As a preferred solution, the columnar housing and the spiral tube liquid flow channel adopt a metal material with good heat resistance, strong corrosion resistance, and a large thermal expansion coefficient, specifically: aluminum or copper.

[0013] The present utility model also provides a method for implementing an immersion battery thermal management system, including: the battery thermal management system is provided with a plurality of single cells connected in series to form a battery pack, and each single cell is wrapped with a layer of sealant coating, immersed in the coolant in a columnar housing and placed in the space inside the inner edge of a spiral tube liquid flow channel; when the battery pack operates in a high-temperature environment, a large amount of heat generated during the charging and discharging process of the battery causes the temperature of the battery pack to continuously rise, and the heat generated by the battery pack is transferred to the coolant inside the columnar housing, and the coolant absorbs the battery heat; secondly, by changing the flow path of the coolant in the spiral tube liquid flow channel, a centrifugal force is generated to form a secondary flow, disturbing the coolant in the columnar housing, thereby breaking the liquid boundary layer formed between the coolant and the battery surface, achieving enhanced convective heat transfer, and finally, along with the coolant in the spiral tube liquid flow channel flowing out from the liquid outlet, the heat is taken out of the thermal management system; in addition, when operating in a cold environment in winter, the temperature of the liquid flow working medium in the spiral tube liquid flow channel can be changed so that the battery can still maintain suitable working conditions.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] The present utility model is provided with a spiral tube liquid flow channel wrapped outside the battery pack. The spiral tube liquid flow channel is immersed in the coolant, its outer edge is in direct contact with the inner wall of the columnar housing, and the inner edge is the placement space for the battery pack. Each single cell is wrapped with a layer of sealant coating; the battery thermal management system uses convective heat transfer to achieve heat transfer between the battery and the external environment, thereby realizing heat exchange; the present utility model uses the method of flow heat exchange, and through the direct contact heat transfer between the coolant and the power battery, the cooling of the battery is realized. The spiral rod liquid flow channel makes the flowing coolant generate a centrifugal force to form a secondary flow, increasing the disturbance of the coolant, thereby breaking the liquid boundary layer formed by the flow development of the coolant on the surface of the power battery, achieving the purpose of enhancing convective heat transfer, and finally improving the cooling effect of the power battery; secondly, the present utility model is different from traditional large-scale immersion liquid cooling devices, highlighting the lightweight design in the design of power batteries. By setting the spiral tube liquid flow channel as a flat spiral rod, the cylindrical space inside its inner edge provides support for the battery, simplifying the system structure, and can greatly reduce the cost of system construction. The battery module has a compact structure, is convenient to install, and has a simple structure. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the immersion battery thermal management system proposed by the present utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the spiral tube channel inside the present utility model;

[0018] Figure 3Schematic diagram of the structure of the screw rod channel of the present utility model;

[0019] Figure 4 Exploded connection diagram of the immersion battery thermal management system proposed by the present utility model;

[0020] In the figure: 1, cylindrical outer shell; 2, spiral tube liquid flow channel; 3, battery pack; 4, liquid outlet pipe; 5, wiring port; 6, sealing bolt; 7, flange head; 8, liquid inlet pipe. Specific implementation manners

[0021] The present utility model will be further described in detail below in conjunction with embodiments and the accompanying drawings, but the implementation manners of the present utility model are not limited thereto.

[0022] Please refer to Figures 1-4 , this embodiment provides a technical solution:

[0023] An immersion battery thermal management system, including a battery, further including a cylindrical outer shell 1 with a built-in battery pack 3, and a spiral tube liquid flow channel 2 wrapped around the battery pack 3; both ends of the cylindrical outer shell 1 are sealed by flange heads 7, a closed cavity is formed inside and filled with a coolant, and the flange heads 7 are respectively provided with a liquid inlet pipe 8, a liquid outlet pipe 4, and a wiring port 5; the spiral tube liquid flow channel 2 is immersed in the coolant, its outer edge is in direct contact with the inner wall of the cylindrical outer shell 1, and its inner edge is a placement space for the battery pack 3; the battery pack 3 is formed by connecting a plurality of single cells in series and parallel, and a sealing glue coating is wrapped around each single cell; the battery thermal management system realizes heat transfer between the battery and the external environment through convective heat transfer, so as to exchange heat.

[0024] In this embodiment, a spiral tube liquid flow channel 2 wrapped around the battery pack 3 is provided. The spiral tube liquid flow channel 2 is immersed in the coolant, its outer edge is in direct contact with the inner wall of the columnar housing 1, and the inner edge is the placement space for the battery pack 3. A layer of sealant coating is wrapped around each single battery; the battery thermal management system uses convective heat transfer to achieve heat transfer between the battery and the external environment, thereby exchanging heat; in this embodiment, the method of flow heat transfer is used, and the coolant is in direct contact with the power battery for heat transfer to achieve cooling of the battery. The spiral rod liquid flow channel causes the flowing coolant to generate centrifugal force to form a secondary flow, increasing the disturbance of the coolant, thereby breaking the liquid boundary layer formed by the flow development of the coolant on the surface of the power battery, achieving the purpose of strengthening convective heat transfer, and ultimately improving the cooling effect of the power battery; secondly, this embodiment is different from traditional large-scale immersion liquid cooling devices, highlighting the lightweight design in the design of the power battery. By setting the spiral tube liquid flow channel 2 as a flat spiral rod, the cylindrical space at its inner edge provides support for the battery, simplifies the system structure, can greatly reduce the cost of system construction, the battery module is structurally compact, easy to install, and the structure is simple.

[0025] In this embodiment, the method of convective heat transfer is adopted, specifically: the spiral tube liquid flow channel 2 is filled with coolant. By changing the flow path of the coolant in the spiral tube liquid flow channel 2, it generates centrifugal force to form a secondary flow, disturbing the coolant in the columnar housing 1, thereby breaking the liquid boundary layer formed between the coolant and the battery surface, achieving strengthening of convective heat transfer; in this embodiment, it is set that coolant is filled in the columnar housing and in the spiral tube liquid flow channel 2 respectively. The two coolants have the same material but are not in the same space. The coolant in the spiral tube liquid flow channel 2 acts as a fluid, flowing in from the inlet pipe 8 and flowing out from the outlet pipe 4, thereby disturbing the coolant in the columnar housing to form convective heat transfer; in addition to the flow of the coolant in the spiral tube liquid flow channel 2, changing the temperature of the liquid flow working medium in the spiral tube liquid flow channel 2 can also achieve the effect of convective heat transfer.

[0026] In this embodiment, the spiral tube liquid flow channel 2 is a flat spiral rod, and the cylindrical space at its inner edge provides support for the battery. The left and right ends of the spiral tube liquid flow channel 2 are respectively connected to the inlet pipe 8 and the outlet pipe 4; the spiral tube liquid flow channel 2 of this embodiment is set as a flat spiral rod. The first purpose: to increase the contact area between the coolant in the columnar housing 1 and the battery pack 3 and enhance the heat dissipation effect; the second purpose: the inner edge cylindrical space can provide support for the battery pack 3, simplifies the system structure, can greatly reduce the cost of system construction, and realizes the lightweight of the thermal management system.

[0027] To ensure that the power battery module can work properly under thermal management conditions, the single cells of the battery pack 3 are connected in series and parallel in sequence, and the left and right ends are connected to the wiring port 5 through wires to output electrical energy; in this embodiment, to solve the problem of electrical insulation between the coolant and the battery, a very thin silicone sealant coating doped with boron nitride is wrapped around each single cell; in addition, the positive and negative directions in which the battery pack 3 is placed are consistent with the length direction of the outer shell.

[0028] To further ensure the sealing effect of this embodiment, the flange head 7 and the columnar shell form a combined body through the sealing bolt 6, and a sealing washer is arranged between the flange head 7 and the sealing bolt 6; in addition, the columnar shell of this embodiment is a detachable closed cavity. When the system equipment is used for too long, impurities will inevitably remain in the flow channel, causing liquid flow blockage or accelerating the corrosion of the spiral plate, thereby reducing the heat exchange performance of the system equipment. Therefore, the columnar outer shell 1 can be disassembled to clean or replace the pipes in the cavity.

[0029] To improve the heat dissipation efficiency and temperature control effect of the power battery module, the coolant in the columnar outer shell 1 and the coolant in the spiral tube liquid flow channel 2 adopt an electronic fluorinated liquid with low viscosity, high boiling point and no volatility.

[0030] To increase the service life of the system equipment, the columnar shell and the spiral tube liquid flow channel 2 are made of metal materials with good heat resistance, strong corrosion resistance and large thermal expansion coefficient, specifically: aluminum or copper.

[0031] On the basis of the above technical solutions, this embodiment also provides a method for implementing an immersion-type battery thermal management system, including:

[0032] The battery thermal management system is provided with a number of single cells connected in series to form a battery pack 3. Each single cell is wrapped with a layer of sealant coating, immersed in the coolant in the columnar outer shell 1 and placed in the space at the inner edge of the spiral tube liquid flow channel 2; when the battery pack 3 works in a high-temperature environment, a large amount of heat is generated during the charging and discharging process of the battery, and the temperature of the battery pack 3 continuously rises. The heat generated by the battery pack 3 is transferred to the coolant inside the columnar outer shell 1, and the coolant absorbs the battery heat; secondly, by changing the flow path of the coolant in the spiral tube liquid flow channel 2, a centrifugal force is generated to form a secondary flow, disturbing the coolant in the columnar outer shell 1, thereby breaking the liquid boundary layer formed between the coolant and the battery surface, achieving enhanced convective heat transfer. Finally, along with the coolant in the spiral tube liquid flow channel 2 flowing out from the liquid outlet, the heat is taken out of the thermal management system; in addition, when working in a cold environment in winter, the temperature of the liquid flow working medium in the spiral tube liquid flow channel 2 can be changed so that the battery can still maintain suitable working conditions.

[0033] The above is a preferred embodiment of the present utility model. However, the embodiments of the present utility model are not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present utility model shall be equivalent replacement methods and are all included in the protection scope of the present utility model.

Claims

1. An immersion battery thermal management system, comprising a battery, characterized in that: It also includes a cylindrical shell with a built-in battery pack and a spiral tube liquid flow channel wrapped around the battery pack; the two ends of the cylindrical shell are sealed by flange heads, and a closed cavity is formed inside and filled with coolant, and the flange heads are respectively provided with a liquid inlet pipe and a liquid outlet pipe, as well as a wiring port; the spiral tube liquid flow channel is immersed in the coolant, and its outer edge is in direct contact with the inner wall of the cylindrical shell, and the inner edge is a placement space for the battery pack; the battery pack is composed of a number of single cells connected in series and parallel, and each single cell is wrapped with a layer of sealant coating; the battery thermal management system uses convection heat exchange to achieve heat transfer between the battery and the external environment, thereby exchanging heat.

2. The submerged battery thermal management system according to claim 1, characterized in that: The spiral tube liquid flow channel is filled with coolant. By changing the flow path of the coolant in the spiral tube liquid flow channel, centrifugal force is generated to form a secondary flow, disrupting the coolant in the columnar shell, thereby destroying the liquid boundary layer formed between the coolant and the battery surface, thereby enhancing convective heat exchange.

3. The submerged battery thermal management system according to claim 1 or 2, characterized in that: The spiral tube liquid flow channel is a flat spiral rod, and the cylindrical space at the inner edge thereof provides support for the battery. The left and right ends of the spiral tube liquid flow channel are respectively connected to the liquid inlet pipe and the liquid outlet pipe.

4. The submerged battery thermal management system according to claim 1, characterized in that: The single cells of the battery pack are connected in series and parallel in sequence, and the left and right ends are connected to the wiring ports through wires to output electrical energy.

5. The submerged battery thermal management system according to claim 1, characterized in that: The flange head is combined with the columnar shell through sealing bolts, and a sealing gasket is arranged between the flange head and the sealing bolts.

6. The submerged battery thermal management system according to claim 1, characterized in that: The cooling liquid in the columnar housing and the cooling liquid in the spiral tube liquid flow channel are low-viscosity, high-boiling-point and non-volatile electronic fluoride liquid.

7. The submerged battery thermal management system according to claim 5, characterized in that: The columnar shell and the spiral tube liquid flow channel are made of metal materials with good heat resistance, strong corrosion resistance and large thermal expansion coefficient, specifically aluminum or copper.

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