Nitrogen filling system for energy storage battery pack

Abstract

The utility model discloses an energy storage battery pack nitrogen filling system which comprises an energy storage container, a plurality of battery packs are arranged in the energy storage container, the energy storage battery pack nitrogen filling system further comprises an inerting explosion suppression container, a nitrogen making device and a control host are arranged in the inerting explosion suppression container, and a control extension set is further arranged in the energy storage container. A detection device is arranged in the battery pack, the detection device is used for detecting one or more of pressure, oxygen concentration and nitrogen concentration in the battery pack, the control host is respectively connected with the nitrogen generation device and the control extension set, the control extension set is also connected with the detection device, and the nitrogen generation device is used for filling nitrogen into the battery pack. The battery pack has the beneficial effects that the battery pack is filled with nitrogen, so that thermal runaway of the battery pack can be prevented, and a suppression effect can be achieved when a fire disaster occurs to the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage power stations, and in particular to a nitrogen filling system for an energy storage battery pack. Background Art

[0002] An electrochemical energy storage power station is a power station equipment that converts electrical energy into chemical energy for storage. In an energy storage power station, battery packs are usually arranged in the form of battery clusters. In order to save the internal space of the energy storage power station container, the battery clusters are usually placed very closely. When the battery pack of one of the battery clusters has thermal runaway, it is very easy to cause the battery pack to catch fire, causing fire and explosion. Moreover, when the battery pack of a battery cluster catches fire and explodes, it will affect the surrounding adjacent battery clusters, causing the surrounding adjacent battery clusters to also catch fire and explode. Therefore, once a fire occurs in an energy storage power station, there will be problems such as a high combustion rate, rapid temperature rise, and easy explosion.

[0003] At present, most energy storage power stations place fire extinguishing agent tanks outside the energy storage container, which are connected to the inside of the energy storage container through pipelines. When a fire occurs, the fire extinguishing agent is sprayed to extinguish the fire. This fire extinguishing method can only be activated after the fire occurs, based on the fire detection information and the linkage fire extinguishing system. It has a delay and cannot suppress the occurrence of battery thermal runaway. Moreover, once a fire occurs in the energy storage power station, it is very easy to cause an explosion. The storage capacity of fire extinguishing agents in the existing fire extinguishing system is limited, and the suppression effect is limited. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a nitrogen filling system for an energy storage battery pack. By filling nitrogen into the battery pack, thermal runaway of the battery pack can be prevented and fire can be suppressed.

[0005] The purpose of the utility model is achieved through the following technical measures: a nitrogen filling system for an energy storage battery pack, comprising an energy storage container, wherein a plurality of battery packs are arranged in the energy storage container, wherein the battery packs are provided with explosion-proof valves, wherein there are more than one energy storage container, and further comprising an inerting explosion-suppression container, wherein a nitrogen making device and a control host are arranged in the inerting explosion-suppression container, wherein a control extension is arranged in the energy storage container, wherein the battery pack is provided with a detection device, wherein the detection device is used to detect the pressure inside and outside the battery pack and the oxygen concentration inside the pack, wherein the control host is respectively connected to the nitrogen making device and the control extension, wherein the control extension is connected to the detection device, and the nitrogen making device is used to fill nitrogen into the battery pack.

[0006] Furthermore, a main valve is provided at the outlet end of the nitrogen generating device, and the outlet end of the main valve is connected to a plurality of sub-valves through a delivery pipeline, and each sub-valve is correspondingly connected to a battery pack.

[0007] Furthermore, the control host is connected to the main valve, and the detection device is connected to the sub-valve.

[0008] Furthermore, the nitrogen making device comprises an air compressor, a nitrogen making machine and a nitrogen storage tank which are connected in sequence.

[0009] Furthermore, the nitrogen generating device further comprises an air storage tank, and the air storage tank is arranged between the air compressor and the nitrogen generating machine.

[0010] Furthermore, the nitrogen generator also includes a cold dryer, which is arranged between the air storage tank and the nitrogen generator.

[0011] Furthermore, the energy storage container includes an equipment compartment and a battery compartment, the battery pack is arranged in the battery compartment, and the control extension is arranged in the equipment compartment.

[0012] Furthermore, a waterproof and breathable membrane is provided on the outside of the explosion-proof valve, and the waterproof and breathable membrane is used to prevent moisture. A silicone membrane is provided on the inside of the explosion-proof valve, and the silicone membrane is used to exhaust air.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the present application provides a sufficient nitrogen source by inerting the explosion suppression container, and forms an inert environment in the battery pack by filling nitrogen into the battery pack, thereby reducing the probability of thermal runaway of the battery pack and actively preventing the occurrence of fires in energy storage power stations. Moreover, if the battery pack has a thermal runaway fire, the present application can also fill a large amount of nitrogen into the battery pack to suppress the fire. The present application uses air to produce nitrogen, which is inexhaustible, can provide a sufficient nitrogen source for the battery pack, and the cost of nitrogen production is low. The present application uses a cold dryer to dry the air, which can reduce the moisture content of the nitrogen entering the battery pack, avoid safety problems such as battery short circuit caused by high moisture content in the air, and can improve the safety of the battery pack and increase the life of the battery pack.

[0014] The utility model is described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a structural diagram of an energy storage container.

[0017] Figure 3 It is a schematic diagram of the structure of an inerted explosion-suppressed container.

[0018] Figure 4 It is a schematic diagram of the structure of the battery pack.

[0019] Figure 5 It is a control flow chart of the utility model.

[0020] Figure 6 It is a curve diagram of the forward exhaust of the explosion-proof valve of the battery pack and the air permeability after explosion.

[0021] Among them, 1. Energy storage container, 2. Inerting explosion suppression container, 3. Control host, 4. Air compressor, 5. Air storage tank, 6. Cold dryer, 7. Nitrogen generator, 8. Nitrogen storage tank, 9. Main valve, 10. Control extension, 11. Battery pack, 12. Battery cluster, 13. Transportation pipeline, 14. Sub-valve, 15. Detection device, 16. Explosion-proof valve, 17. Nitrogen nozzle. DETAILED DESCRIPTION

[0022] like Figures 1 to 6 As shown, a nitrogen filling system for energy storage battery packs includes an energy storage container 1, wherein the energy storage container 1 is provided with a plurality of battery packs 11, and the plurality of battery packs 11 are arranged in the energy storage container 1 in the form of a battery cluster 12. An explosion-proof valve 16 is provided on the battery pack 11, and further, a waterproof and breathable membrane is provided on the outside of the explosion-proof valve 16, and the waterproof and breathable membrane is used to prevent moisture, and a silicone membrane is provided on the inside of the explosion-proof valve 16, and the silicone membrane is used to exhaust gas. A nitrogen generator and a control host 3 are provided in the inerting explosion suppression container 2, and a control extension 10 is also provided in the energy storage container 1. A detection device 15 is provided in the battery pack 11, and the detection device 15 is used to detect the pressure inside and outside the battery pack 11 and the oxygen concentration inside the pack. The control host 3 is connected to the nitrogen generator and the control extension 10 respectively, and the control extension 10 is also connected to the detection device 15. The nitrogen generator is used to fill nitrogen into the battery pack 11. The present application provides a sufficient nitrogen source by inerting the explosion suppression container 2, and forms an inert environment in the battery pack 11 by filling nitrogen into the battery pack 11, thereby reducing the probability of thermal runaway of the battery pack 11, and actively preventing the occurrence of fires in energy storage power stations. Moreover, if the battery pack 11 has thermal runaway and catches fire, the present application can also fill a large amount of nitrogen into the battery pack 11 to suppress the fire.

[0023] The outlet end of the nitrogen generator is provided with a main valve 9, and the outlet end of the main valve 9 is connected to a plurality of sub-valves 14 through a delivery pipeline 13, and each sub-valve 14 is connected to a corresponding battery pack 11. Specifically, a nitrogen nozzle 17 is provided on the battery pack 11, and the sub-valve 14 is connected to the nitrogen nozzle 17 through a pipeline. Through the arrangement of the main valve 9 and the sub-valve 14, nitrogen can be passed into the specified battery pack 11, which is convenient for nitrogen replenishment of the battery pack 11.

[0024] The control host 3 is connected to the main valve 9, and the detection device 15 is connected to the sub-valve 14. Specifically, the detection device 15 in the battery pack 11 is connected to the sub-valve 14 corresponding to the battery pack 11. The control host 3 controls whether the nitrogen generator outputs nitrogen, and the detection device 15 controls whether nitrogen is introduced into the battery pack 11.

[0025] The nitrogen making device comprises an air compressor 4, a nitrogen making machine 7 and a nitrogen storage tank 8 connected in sequence. The air compressor 4 delivers outside air to the nitrogen making machine 7, and nitrogen is produced by the nitrogen making machine 7 and delivered to the nitrogen storage tank 8 for buffering. The present application adopts air to produce nitrogen, which is inexhaustible and can provide sufficient nitrogen source for the battery pack 11, and the cost of nitrogen production is low.

[0026] The nitrogen making device further comprises an air storage tank 5, which is arranged between the air compressor 4 and the nitrogen making machine 7. The air storage tank 5 buffers air, thereby providing a stable air source for the nitrogen making machine 7.

[0027] The nitrogen generator further includes a cold dryer 6, which is disposed between the air storage tank 5 and the nitrogen generator 7. The cold dryer 6 dries the air source, so that the nitrogen generator 7 can generate dry nitrogen. When the battery pack 11 is filled with nitrogen, the moisture content in the battery pack 11 can be reduced, thereby avoiding safety problems such as battery short circuit caused by high moisture content in the air, thereby improving the safety of the battery pack 11 and increasing the life of the battery pack 11.

[0028] There are more than one energy storage container 1. When there are multiple energy storage containers 1, the control host 3 is respectively connected to the control sub-machines 10 in the multiple energy storage containers 1. Nitrogen can be filled into the battery packs 11 in multiple energy storage containers 1 through an inerting explosion suppression container 2.

[0029] The energy storage container 1 includes an equipment compartment and a battery compartment. The battery pack 11 is arranged in the battery compartment, and the control sub-unit 10 is arranged in the equipment compartment.

[0030] The detection device 15 includes one or more of a pressure sensor, an oxygen concentration sensor and a nitrogen concentration sensor.

[0031] A method for filling a nitrogen storage battery pack, based on the nitrogen filling system for the energy storage battery pack, comprises the following steps:

[0032] Step 1. Preset the upper limit of the internal exhaust pressure P2 of the battery pack 11, and the oxygen concentration thresholds C1 and C2 in the battery pack 11. The P2 is greater than the exhaust pressure P1 of the explosion-proof valve 16 of the battery pack 11, and the P2 is less than the bursting pressure P3 of the explosion-proof valve 16 of the battery pack 11, that is, P1 < P2 < P3. The C1 < C2. Further preferably, C1 < C2 < 8%. Specifically, when the pressure P in the battery pack 11 < P1, the explosion-proof valve 16 is in a normal state, playing a role in moisture resistance and protection for the battery pack 11; when P1 < P < P2, the explosion-proof valve 16 is in a positive-pressure exhaust state, and the battery pack 11 exhausts gas; when P > P3, the explosion-proof valve 16 is in an explosion-proof pressure relief state, and the battery pack 11 performs rapid exhaust and pressure relief to prevent the package from bursting; when the external pressure -P of the battery pack 11 > P1, the explosion-proof valve 16 is in a negative-pressure intake state, and gas flows into the battery pack 11. It should be noted that the present application does not limit the specific values of P1, P2, P3, C1, and C2, and the specific values can be set according to the actual situation.

[0033] Step 2. Detect the pressure P and oxygen concentration C in the battery pack 11. If P < P2 and C > C2, start the nitrogen generation device, flush nitrogen into the battery pack 11 for nitrogen replacement, and detect the pressure P and oxygen concentration C in real time. If P > P2 or C < C1, stop nitrogen filling.

[0034] When in use, the present application can judge whether nitrogen needs to be filled into the battery pack 11 based on the pressure and oxygen concentration in the battery pack 11. In addition, the present application can also judge whether the battery pack 11 has an airtightness problem according to the pressure, oxygen concentration, or nitrogen concentration. The following takes the pressure and oxygen concentration as examples for specific description.

[0035] When the control extension 10 receives that the oxygen concentration C in a certain battery pack 11 uploaded by the detection device 15 > C2 and the pressure P of the battery pack 11 < P2, the control extension 10 uploads it to the control host 3. The control host 3 starts the nitrogen generation device to generate nitrogen. At the same time, the control host 3 opens the main valve 9, and the detection device 15 opens the branch valve 14 corresponding to the battery pack 11 to start filling nitrogen into the battery pack 11. When P > P1, the explosion-proof valve 16 on the battery pack 11 is in a positive-pressure exhaust state, and the battery pack 11 performs nitrogen replacement. When the oxygen concentration C < C1, the main valve 9 and the branch valve 14 are closed to stop nitrogen filling. During the nitrogen replacement process, if P > P2, immediately close the main valve 9 and the branch valve 14 to stop nitrogen filling until P drops to P1, and then start nitrogen filling again. Repeat this process until C < C1 to stop nitrogen filling.

[0036] In step 2, the longest time from the initial state of the battery pack 11 to the completion of the nitrogen replacement of a single battery pack 11 is recorded as Tm. If the nitrogen filling time is greater than Tm, the pressure P in the battery pack 11 is always less than P1 or the oxygen concentration C is always greater than C2, it means that there is a problem with the airtightness of the battery pack 11, and a fault alarm is issued to remind the staff to carry out maintenance.

[0037] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limitations on the present invention.

[0038] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A nitrogen filling system for an energy storage battery pack, comprising an energy storage container, wherein a plurality of battery packs are arranged in the energy storage container, characterized in that: The battery pack is provided with an explosion-proof valve. There are more than one energy storage container, which also includes an inerting explosion-suppression container. The inerting explosion-suppression container is provided with a nitrogen generator and a control host. The energy storage container is provided with a control extension. The battery pack is provided with a detection device, which is used to detect the pressure inside and outside the battery pack and the oxygen concentration inside the pack. The control host is respectively connected to the nitrogen generator and the control extension, and the control extension is connected to the detection device. The nitrogen generator is used to fill nitrogen into the battery pack.

2. The nitrogen filling system for energy storage battery pack according to claim 1, characterized in that: A main valve is provided at the outlet end of the nitrogen generator, and the outlet end of the main valve is connected to a plurality of sub-valves through a delivery pipeline, and each sub-valve is correspondingly connected to a battery pack.

3. The nitrogen filling system for energy storage battery pack according to claim 2, characterized in that: The control host is connected to the main valve, and the detection device is connected to the sub-valve.

4. The nitrogen filling system for energy storage battery pack according to claim 1, characterized in that: The nitrogen making device comprises an air compressor, a nitrogen making machine and a nitrogen storage tank which are connected in sequence.

5. The nitrogen filling system for energy storage battery pack according to claim 4, characterized in that: The nitrogen making device further comprises an air storage tank, and the air storage tank is arranged between the air compressor and the nitrogen making machine.

6. The nitrogen filling system for energy storage battery pack according to claim 5, characterized in that: The nitrogen generator also includes a cold dryer, which is arranged between the air storage tank and the nitrogen generator.

7. The nitrogen filling system for energy storage battery pack according to claim 1, characterized in that: The energy storage container comprises an equipment compartment and a battery compartment. The battery pack is arranged in the battery compartment, and the control extension is arranged in the equipment compartment.

8. The nitrogen filling system for energy storage battery pack according to claim 1, characterized in that: A waterproof and breathable membrane is arranged on the outside of the explosion-proof valve, and the waterproof and breathable membrane is used for moisture resistance. A silicone membrane is arranged on the inside of the explosion-proof valve, and the silicone membrane is used for exhaust.

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