Temperature control and fire fighting integrated coupling system for energy storage cabinet

Abstract

The utility model relates to the technical field of energy storage, in particular to a temperature control and fire control integrated coupling system for an energy storage cabinet, which comprises a carbon dioxide cold and heat pump unit, a temperature control unit, a fire control unit, a temperature control unit, a fire control unit, a fire control unit and a fire control unit, and is characterized in that the carbon dioxide cold and heat pump unit comprises a compressor, an air cooler, a throttle valve and an evaporator; the evaporator is also connected with the compressor; the heat supply unit comprises a high-temperature water tank which is connected with the heat utilization scene and is used for storing high-temperature water, and a first normal-temperature water tank which is used for recycling normal-temperature water which is cooled after passing through the heat utilization scene; wherein the air cooler is simultaneously connected with the first normal-temperature water tank and the high-temperature water tank; the cooling unit comprises a low-temperature water tank which is connected with the energy storage cabinet and is used for storing cooling water, and a second normal-temperature water tank which is used for recycling normal-temperature water which is heated after passing through the energy storage cabinet; wherein the evaporator is simultaneously connected with the second normal-temperature water tank and the low-temperature water tank. According to the utility model, the temperature control of the energy storage cabinet and the recycling of waste heat can be considered.

Description

TECHNICAL FIELD

[0001] The utility model relates to the energy storage technology field especially relates to a kind of temperature control and fire-fighting integrated coupling system for energy storage cabinet. BACKGROUND

[0002] Valley electricity and peak electricity are new electricity price types, and the significance of "peak-valley electricity price" is to encourage the consumption of low-valley electricity under the preferential conditions of low-valley electricity price, and to transfer low-valley electricity to peak period by using energy storage cabinet, which not only alleviates the supply gap of peak electricity, but also promotes the optimal allocation of electricity resources, which is a win-win strategy of "peak load shifting". Since the optimal working temperature of lithium battery is between 15℃ and 25℃, the working temperature range is between 0℃ and 45℃, and the temperature range that can be tolerated is between -20℃ and 60℃, too high or too low temperature will affect the service life and performance of the battery, so heat management is needed for the energy storage cabinet to protect the battery and effectively reduce the energy consumption of the energy storage cabinet.

[0003] In addition, the battery voltage is high during charging or after charging, the battery activity is large, the battery cell is in overcharge state, the voltage rises to form internal short circuit, which causes local thermal runaway and causes self-ignition and other conditions. As can be seen, heat management is very important for the safety of energy storage cabinet, and the energy storage system must be equipped with a temperature control system with sufficient strength and flexibility to ensure the safe and stable operation of the energy storage cabinet. Therefore, to solve the safety problem, the most fundamental problem is to solve the heat management problem.

[0004] The energy storage cabinet will generate a lot of waste heat during charging and discharging, which will cause the temperature of the energy storage cabinet to rise, and the temperature will be too high, which will reduce the service life of the battery of the energy storage cabinet and reduce the storage capacity and the efficiency of charging and discharging. The main way to cool the energy storage cabinet is air cooling, liquid cooling and phase change cooling. Since the battery air cooling technology has low heat exchange efficiency, the battery heat generation increases, which will cause the battery temperature to be too high, and there is a risk of thermal runaway; although the battery phase change cooling technology has the advantages of compact structure, low contact thermal resistance and good cooling effect, the phase change material itself does not have heat dissipation capacity, and the heat absorbed needs to be discharged by liquid cooling system, air cooling system, etc., otherwise the phase change material cannot continuously absorb heat. In addition, phase change material occupies space and has high cost; and liquid cooling system not only has the characteristics of large heat capacity, low flow resistance and high heat exchange efficiency, but also can force the battery pack to dissipate heat and realize the heat redistribution between battery modules in the case of thermal runaway precursor, which can quickly suppress the continuous deterioration of thermal runaway and reduce the risk of thermal runaway.

[0005] To this end, for example, the publication number CN113368434A discloses a new energy storage station energy storage cabinet fire and explosion prevention system, which uses carbon dioxide as a medium, can realize fire extinguishing and refrigeration inside the lithium energy storage cabinet and the control room, the carbon dioxide is recycled during refrigeration, and the carbon dioxide is sprayed during fire extinguishing, the structure is compact, the occupied area is reduced, and the operation is more convenient. Through a set of system, refrigeration and fire extinguishing can be realized, and the practicality is high. For example, the publication number CN114300773A discloses a lithium battery energy storage cabinet automatic protection system, which can ventilate and cool the inside of the lithium battery energy storage cabinet body, can realize real-time detection, has good detection effect, and can discharge the flammable gas in the lithium battery energy storage cabinet body through an exhaust pipe; low-temperature carbon dioxide is used for cooling and fire extinguishing, and has good protection effect.

[0006] There are many technologies for using carbon dioxide to realize cooling and protection of the energy storage cabinet. However, the above-mentioned disclosed technologies only consider cooling of the energy storage cabinet, and cannot realize extraction and utilization of waste heat absorbed during the cooling process of the energy storage cabinet, so there is a problem of energy waste. Practical new type content

[0007] The utility model aims at providing a kind of coupling system for energy storage cabinet temperature control and fire-fighting integration, to solve the technical problem of considering temperature control and waste heat reuse of energy storage cabinet.

[0008] The coupling system for energy storage cabinet temperature control and fire-fighting integration of the utility model is realized as follows:

[0009] A kind of coupling system for energy storage cabinet temperature control and fire-fighting integration, comprising:

[0010] A cold and heat pump unit comprising a compressor, an air cooler connected to the compressor, a throttling valve connected to the air cooler, and an evaporator connected to the throttling valve; the evaporator is also connected to the compressor;

[0011] A heat supply unit comprising a high-temperature water tank storing high-temperature water connected to a heat utilization scene, and a first normal-temperature water tank for recovering normal-temperature water cooled after passing through the heat utilization scene; wherein the air cooler is connected to the first normal-temperature water tank and the high-temperature water tank simultaneously;

[0012] A cooling unit comprising a low-temperature water tank storing cooling water connected to the energy storage cabinet, and a second normal-temperature water tank for recovering normal-temperature water warmed after passing through the energy storage cabinet; wherein the evaporator is connected to the second normal-temperature water tank and the low-temperature water tank simultaneously.

[0013] In the optional implementation of the utility model, the cold and heat pump unit further comprises carbon dioxide working substance suitable for circulating between the compressor, the air cooler, the throttling valve and the evaporator.

[0014] In optional implementation of the utility model, the low-temperature water tank is further connected with a spraying net pipe for spraying cooling water to the energy storage cabinet.

[0015] In optional implementation of the utility model, the pipeline of the low-temperature water tank for connecting the spraying net pipe and the pipeline of the low-temperature water tank for connecting the energy storage cabinet are connected in parallel.

[0016] In optional implementation of the utility model, the second water pump is further arranged between the low-temperature water tank and the spraying net pipe and the energy storage cabinet.

[0017] In optional implementation of the utility model, the third water valve is arranged between the second water pump and the spraying net pipe.

[0018] In optional implementation of the utility model, the second water valve is arranged between the second water pump and the energy storage cabinet.

[0019] In optional implementation of the utility model, the first water pump is further arranged between the high-temperature water tank and the heat utilization scene.

[0020] In optional implementation of the utility model, the first water valve is arranged between the first water pump and the heat utilization scene.

[0021] In optional implementation of the utility model, the second normal-temperature water tank can be connected with the spraying net pipe through the pipeline.

[0022] The utility model has the advantages that: the coupling system for temperature control and fire-fighting of the energy storage cabinet of the utility model utilizes the cold and heat pump unit to produce hot water and cold water for temperature control of the energy storage cabinet and the fire-fighting system of the energy storage cabinet, and the waste heat recovered from the energy storage cabinet is used in various heat utilization scenes. On the one hand, the energy storage cabinet can be maintained in the optimal working temperature range, so that the energy storage cabinet can stably and efficiently operate, and a large amount of energy can be stored and a large energy storage efficiency can be maintained. On the other hand, when the energy storage cabinet loses control and causes a fire, the cooling water produced by the cold and heat pump unit can be used for spraying the net pipe, so as to cool and extinguish the out-of-control energy storage cabinet, the fire of the out-of-control energy storage cabinet system can be controlled in the first time, and the damage can be minimized. In addition, the waste heat generated when the energy storage cabinet stores energy in valley electricity and releases energy in peak electricity can be recovered by the cold and heat pump unit, and the recovered excess waste heat can be used in various heat utilization scenes, so that the energy utilization is reduced, the electricity cost is reduced, and the peak load shifting of electric power is promoted. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The utility model discloses a coupling system for temperature control and fire-fighting of an energy storage cabinet.

[0024] In the figure: compressor 1, air cooler 2, throttle valve 3, evaporator 4, high-temperature water tank 5, first water pump 6, first water valve 7, heat-using scenario 8, first normal-temperature water tank 9, low-temperature water tank 10, second water pump 11, second water valve 12, energy storage cabinet 13, second normal-temperature water tank 14, third water valve 15, spray network pipe 16. DETAILED DESCRIPTION

[0025] In order to make the content of the utility model more easily understood clearly, the following according to specific embodiment and combining with the drawings, the utility model is further explained in detail.

[0026] Please refer to Figure 1 The embodiment provides a coupling system for temperature control and fire-fighting of an energy storage cabinet, which comprises a cold and heat pump unit, and a heat supply unit and a cooling unit connected with the cold and heat pump unit respectively.

[0027] Specifically, the cold and heat pump unit comprises a compressor 1, an air cooler 2 connected with the compressor 1, a throttle valve 3 connected with the air cooler 2 and an evaporator 4 connected with the throttle valve 3; the evaporator 4 is also connected with the compressor 1. The heat supply unit comprises a high-temperature water tank 5 connected with a heat-using scenario 8 and storing high-temperature water, and a first normal-temperature water tank 9 for recovering normal-temperature water cooled after passing through the heat-using scenario 8; wherein the air cooler is connected with the first normal-temperature water tank 9 and the high-temperature water tank 5 simultaneously. The cooling unit comprises a low-temperature water tank 10 connected with the energy storage cabinet 13 and storing cooling water, and a second normal-temperature water tank 14 for recovering normal-temperature water heated after passing through the energy storage cabinet 13; wherein the evaporator 4 is connected with the second normal-temperature water tank 14 and the low-temperature water tank 10 simultaneously.

[0028] Based on the above situation, furthermore, the cold and heat pump unit further comprises carbon dioxide working medium adapted to flow among the compressor 1, the air cooler 2, the throttle valve 3 and the evaporator 4.

[0029] Secondly, the first water pump 6 is further arranged between the high-temperature water tank 5 and the heat-using scenario 8. The first water valve 7 is arranged between the first water pump 6 and the heat-using scenario 8.

[0030] In addition, in an optional implementation, the low-temperature water tank 10 is further connected with a spray network pipe 16 for spraying cooling water to the energy storage cabinet 13. In this regard, it should be noted that the pipeline for connecting the spray network pipe 16 with the low-temperature water tank 10 is connected in parallel with the pipeline for connecting the energy storage cabinet 13 with the low-temperature water tank 10. The second water pump 11 is further arranged between the low-temperature water tank 10, the spray network pipe 16 and the energy storage cabinet 13. The third water valve 15 is arranged between the second water pump 11 and the spray network pipe 16. The second water valve 12 is arranged between the second water pump 11 and the energy storage cabinet 13.

[0031] Based on the above, the compressor 1 is used to compress the low-temperature and low-pressure gaseous carbon dioxide to high-temperature and high-pressure state; the gas cooler 2 is used to absorb the compression heat of the compressor 1; the throttle valve 3 is used to reduce the pressure of the carbon dioxide, while the temperature is also reduced. The evaporator 4 is used for the gasification of the carbon dioxide, while the medium or high-temperature water flowing out of the energy storage cabinet 13 or the spray network pipe 16 is cooled to form cooling water, and then the cooling water is stored in the low-temperature water tank 10. The first normal-temperature water tank 9 is used to recover and store the high-temperature water after releasing heat, and absorb the heat of the carbon dioxide working medium; the second normal-temperature water tank 14 is used to recover and store the low-temperature water after absorbing heat, and transfer the heat to the carbon dioxide working medium. It should be noted that the second normal-temperature water tank 14 can also be connected with the spray network pipe 16 through a pipeline, which can supplement the water when the water amount of the low-temperature water tank 10 is insufficient for fire extinguishing, and also can improve the water spraying pressure when the second normal-temperature water tank 14 and the low-temperature water tank 10 are used together, thereby improving the fire extinguishing efficiency of the energy storage cabinet 13 in a short time.

[0032] In summary, for the coupling system for temperature control and fire extinguishing of the energy storage cabinet in the embodiment, the general implementation principle is as follows:

[0033] The low-temperature and low-pressure gaseous carbon dioxide enters the compressor 1 and is compressed to high-temperature and high-pressure state, and the carbon dioxide at the outlet of the compressor 1 enters the gas cooler 2, which absorbs the compression heat of the carbon dioxide by using the water returned in the first normal-temperature water tank 9 in various heat-using scenes 8, and then enters the high-temperature water tank 5 for storage after being heated. The cooled normal-temperature and high-pressure carbon dioxide further enters the throttle valve 3 to reduce the pressure, and then enters the evaporator 4 to absorb the heat from the energy storage cabinet 13, and then undergoes a new round of compression.

[0034] The high-temperature water in the high-temperature water tank 5 supplies heat to various heat-using scenes 8, and the high-temperature water absorbing the cold energy of various heat-using scenes 8 is stored in the first normal-temperature water tank 9, and the cold energy absorbed and stored from various heat-using scenes 8 is transferred to the gas cooler 2 and then returned to the high-temperature water tank 5.

[0035] When the temperature of the energy storage cabinet 13 is too high, the cooling water in the low-temperature water tank 10 is used to provide cold energy for the energy storage cabinet 13, the cooling water after transferring the cold energy is heated and recovered to the second normal-temperature water tank 14, and continues to participate in the cycle of absorbing the cold energy in the evaporator 4 and returning to the low-temperature water tank 10. When the energy storage cabinet 13 loses control and causes a fire, the cooling water in the low-temperature water tank 10 is used to provide cooling water for the spray network pipe 16.

[0036] Therefore, the embodiment can produce hot water and cold water by using the heat pump unit to control the temperature of the energy storage cabinet 13 and the fire extinguishing system of the energy storage cabinet 13, and recycle the waste heat of the energy storage cabinet 13 for various heat utilization scenes 8. On the one hand, the energy storage cabinet 13 can be maintained in an optimal working temperature range, so that the energy storage cabinet 13 can stably and efficiently operate, and a large amount of energy can be stored and a large energy storage efficiency can be maintained. On the other hand, when the energy storage cabinet 13 loses control and causes a fire, the cooling water produced by the heat pump unit can be used for spraying the pipe network 16 to cool and extinguish the fire of the out-of-control energy storage cabinet 13, so that the out-of-control energy storage cabinet 13 system can control the fire in the first time and reduce the damage to the minimum. In addition, the waste heat generated by the energy storage cabinet 13 during valley electricity energy storage and peak electricity energy release can be recycled by using the heat pump unit, and the recycled excess waste heat can be used for various heat utilization scenes 8, which not only reduces the utilization of energy, but also reduces the electricity cost and promotes the peak load shifting of electricity.

[0037] The above specific embodiments further specifically describe the purpose, technical scheme and advantages of the utility model, and it should be understood that the above are only specific embodiments of the utility model and are not used to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0038] In the description of the utility model, it should be understood that the terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0039] In the utility model, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In the utility model, unless another definite provision and limitation, first feature is on or under second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but are in contact through other features between them. Moreover, first feature is on, above and on top of second feature includes that first feature is directly above and obliquely above second feature, or only indicates that the horizontal height of first feature is higher than second feature. First feature is under, below and under second feature includes that first feature is directly below and obliquely below second feature, or only indicates that the horizontal height of first feature is less than second feature.

Claims

1. A coupling system for temperature control and fire protection of an energy storage cabinet, characterized in that Comprise: A cold heat pump unit comprising a compressor, an air cooler connected to the compressor, a throttling valve connected to the air cooler, and an evaporator connected to the throttling valve; The evaporator is also connected to the compressor; A heat supply unit comprising a high-temperature water tank storing high-temperature water connected to a heat use scene, and a first normal-temperature water tank for recovering normal-temperature water cooled after passing through the heat use scene; wherein the air cooler is connected to both the first normal-temperature water tank and the high-temperature water tank; A cooling unit comprising a low-temperature water tank storing cooling water connected to an energy storage cabinet, and a second normal-temperature water tank for recovering normal-temperature water heated after passing through the energy storage cabinet; wherein the evaporator is connected to both the second normal-temperature water tank and the low-temperature water tank.

2. The coupling system for temperature control and fire protection of an energy storage tank according to claim 1, characterized in that, The cold heat pump unit further comprises carbon dioxide working medium adapted to flow between the compressor, the air cooler, the throttling valve, and the evaporator.

3. The coupling system for temperature control and fire protection of an energy storage tank according to claim 1 or 2, characterized in that, The low-temperature water tank is further connected to a spray network pipe for spraying cooling water to the energy storage cabinet.

4. The coupling system for temperature control and fire protection of an energy storage tank according to claim 3, characterized in that, The pipe for connecting the spray network pipe to the low-temperature water tank and the pipe for connecting the low-temperature water tank to the energy storage cabinet are connected in parallel.

5. The coupling system for temperature control and fire protection of an energy storage tank according to claim 4, characterized in that, A second water pump is further provided between the low-temperature water tank and the spray network pipe and the energy storage cabinet.

6. The coupling system for temperature control and fire protection of an energy storage tank according to claim 5, characterized in that, A third water valve is provided between the second water pump and the spray network pipe.

7. The coupling system for temperature control and fire protection of an energy storage tank according to claim 5 or 6, characterized in that, A second water valve is provided between the second water pump and the energy storage cabinet.

8. The coupling system for temperature control and fire protection of an energy storage tank according to claim 1 or 2, characterized in that, A first water pump is further provided between the high-temperature water tank and the heat use scene.

9. The coupling system for temperature control and fire protection of an energy storage tank according to claim 8, characterized in that, A first water valve is provided between the first water pump and the heat use scene.

10. The coupling system for temperature control and fire protection of an energy storage tank according to claim 3, characterized in that, The second normal-temperature water tank can be connected to the spray network pipe through a pipe.

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