Electrolyte management system for energy storage lithium battery

Abstract

The present application relates to the technical field of battery apparatuses, and discloses an electrolyte management system for an energy storage lithium battery. The system comprises an energy storage unit, a function regulation and control unit, a power unit, and a safety regulation and control unit. An electrolyte master outlet of the energy storage unit is communicated with an inlet of the function regulation and control unit. An outlet of the function regulation and control unit is communicated with an inlet of the power unit. An outlet of the power unit is communicated with an electrolyte master inlet of the energy storage unit. An outlet of the safety regulation and control unit is communicated with agent injection inlets of the energy storage unit. The energy storage unit comprises a battery cell unit composed of a plurality of battery cells. The function regulation and control unit comprises a monitoring apparatus I, an electrolyte storage apparatus I, a regulation and control apparatus I, and an additive storage apparatus I which are communicated. The safety regulation and control unit comprises monitoring apparatuses II, and a regulation and control apparatus II and a storage apparatus II which are communicated. The system can effectively reduce temperature fluctuations in the charging and discharging process of the battery cells, thereby prominently prolonging the cycle life of the battery cells. The system also can determine a thermal runaway threshold, thereby effectively preventing the occurrence of thermal runaway.

Description

An electrolyte management system for energy storage lithium batteries Technical Field

[0001] The present application relates to the technical field of battery devices, and in particular to an electrolyte management system for energy storage lithium batteries. Background Art

[0002] Lithium-ion batteries, with their high energy density, low self-discharge rate, long cycle life, and lack of memory effect, are being widely used in energy storage. As lithium-ion batteries are used more frequently, the electrolyte within them changes, causing battery performance to degrade. Certain reaction byproducts can further accelerate this degradation. However, existing battery management systems are unable to effectively monitor the chemical changes in the electrolyte within lithium-ion batteries, preventing them from accurately assessing their performance and remaining service life. Furthermore, they are unable to effectively remove these byproducts, significantly reducing the cycle life of lithium-ion batteries.

[0003] In the current lithium-ion battery energy storage field, lithium-ion battery modules are primarily used, consisting of multiple lithium-ion battery cells connected in series and parallel. Multiple lithium-ion battery modules are then connected in series and parallel to form a battery system. Inconsistencies in battery cells often lead to accelerated degradation of individual cells in a battery system, shortening the lifespan of the battery system. Furthermore, due to long-term improper use, individual inconsistent cells may cause internal short circuits, heat accumulation, and other problems, ultimately leading to thermal runaway. This can affect multiple closely spaced batteries within the system, triggering larger-scale thermal runaway and compromising the safety of the battery system.

[0004] Utility Model Content

[0005] In view of this, the present application provides an electrolyte management system for energy storage lithium batteries, the main purpose of which is to solve the technical problems of being unable to effectively monitor and accurately control changes in electrolyte components and thermal runaway.

[0006] On the one hand, the present application provides an electrolyte management system for an energy storage lithium battery, the system comprising an energy storage unit, a function control unit, a power unit, and a safety control unit;

[0007] The total electrolyte outlet of the energy storage unit is connected to the inlet of the function control unit, the outlet of the function control unit is connected to the inlet of the power unit, the outlet of the power unit is connected to the total electrolyte inlet of the energy storage unit; the outlet of the safety control unit is connected to the injection inlet of the energy storage unit;

[0008] Wherein, the energy storage unit includes a battery cell unit composed of a plurality of single batteries;

[0009] The functional control unit includes a monitoring device 1, a liquid storage device 1, a control device 1, and an additive storage device 1 that are connected to each other; the control device 1 is used to transport the material 1 in the additive storage device 1 to the liquid storage device 1 according to the detection results of the electrolyte components by the monitoring device 1;

[0010] The safety control unit includes a monitoring device II, a connected control device II and a storage device II; the control device II is used to transport the material II in the storage device II to the battery cell unit according to the detection results of the electrolyte temperature, pressure and gas concentration by the monitoring device II;

[0011] The power unit is used for circulating the electrolyte of the energy storage lithium battery.

[0012] The above-mentioned energy storage unit of the present application includes at least one electrolyte main inlet, one electrolyte main outlet and one or more injection inlets; the electrolyte main outlet, the function control unit, the power unit, and the electrolyte main inlet are connected in sequence to form an electrolyte circulation pipeline.

[0013] The above-mentioned energy storage unit of the present application includes a battery cell unit composed of multiple single batteries connected in series / parallel, and a circulating liquid circuit, which are all existing technologies in the field.

[0014] The injection inlet of the present application is also referred to as the water (gas) injection inlet.

[0015] Optionally, the monitoring device I includes an optical window and a component detection device.

[0016] Optionally, the electrolyte outlet of the energy storage unit is connected to the inlet of the optical window, the outlet of the optical window is connected to the (electrolyte) inlet of the liquid storage device I, the (electrolyte) outlet of the liquid storage device I is connected to the inlet of the power unit, and the outlet of the power unit is connected to the electrolyte inlet of the energy storage unit.

[0017] Optionally, the component detection device is selected from at least one of a Raman spectrometer, an infrared spectrometer and an ultraviolet spectrometer.

[0018] The above-mentioned optical window and its installation method, and the spectrometer for detecting and analyzing the chemical state of the electrolyte in this application are all existing technologies.

[0019] Optionally, the regulating device I includes a control valve I.

[0020] The control valve I of the present application is used to control the opening or closing of the additive pipeline, and the type of the control valve I can be selected from the prior art.

[0021] Optionally, the additive storage device I includes a plurality of additive storage bins arranged in parallel.

[0022] The above-mentioned multiple additive storage bins of the present application are respectively used to store lithium hexafluorophosphate, hexamethyldisilazane, dicyclohexylcarbodiimide, pyridine or tributylamine, and the additives can remove water and acid from the electrolyte in the liquid storage device I; or, the above-mentioned multiple additive storage bins are respectively used to store vinylene carbonate or fluoroethylene carbonate, and the additives can extend the cycle life.

[0023] Optionally, the liquid storage device I (ie, the electrolyte cell) includes an electrolyte inlet and an electrolyte outlet, and is also provided with a plurality of additive inlets.

[0024] Optionally, the control valve I is provided between the outlet of each additive storage bin and the additive inlet of the liquid storage device I.

[0025] The function of the above-mentioned functional control unit of the present application is to use a spectrometer to monitor the chemical composition status of the electrolyte flowing through the optical window, and determine which additive control valve I should be opened based on the monitoring results to add a suitable additive to the liquid storage device I to adjust the electrolyte composition during the circulation process and achieve the optimal state.

[0026] The present application selects to open the control valve of the corresponding additive storage bin according to the monitoring results of the spectrometer. The monitoring results can be read manually, and it can be determined based on operating experience that a specific additive should be added, and the control valve of the corresponding additive storage bin can be opened manually.

[0027] The function control unit of the present application can be controlled manually or automatically.

[0028] Optionally, the control device I also includes a controller I.

[0029] Optionally, the component detection device is electrically connected to the controller 1, and the controller 1 is electrically connected to the control valve 1.

[0030] When the functional control unit of the present application is in automatic control operation, the spectrometer monitors the chemical state of the electrolyte online and sends the monitoring data to the controller I. After the controller I receives the data transmitted by the front end, it compares it with the preset value, determines the execution instruction, and sends the execution instruction to the corresponding control valve I to achieve the purpose of automatic monitoring and automatic valve opening.

[0031] Optionally, the controller I is selected from a programmable industrial controller.

[0032] Optionally, the monitoring device II is selected from a temperature sensor, C x H y O z At least one of a gas sensor, a CO gas sensor, and a H2 gas sensor.

[0033] The temperature sensor of the present application is used to monitor the temperature of the electrolyte in the outlet pipe of the single cell, and the gas sensor is used to monitor the gas concentration in the outlet pipe of the single cell.

[0034] Optionally, a monitoring device II is provided at the electrolyte outlet of each single cell.

[0035] The present application sets a temperature sensor and a gas concentration sensor at the electrolyte outlet of each single battery, which can accurately monitor the temperature and gas change status of a single battery in the battery unit.

[0036] Optionally, the regulating device II includes a control valve II;

[0037] The injection inlet of the energy storage unit is an injection inlet set on each single cell. The injection inlet on the single cell is connected to the electrolyte flow channel in the single cell, and the water or gas injected by the storage device II enters the electrolyte flow channel; the control valve II is set between the injection inlet of each single cell and the outlet of the storage device II.

[0038] This application sets a control valve II on the injection port of each single battery, which can accurately and flexibly control the operating status of the single battery.

[0039] The present application can adopt a manual method to read the sensor monitoring results, judge to open the control valve II of the corresponding single cell based on operating experience, and inject water or inert gas into the single cell to quickly and effectively prevent further thermal failure without damaging other single cells.

[0040] Optionally, the control device II also includes a controller II.

[0041] When the safety control unit of the present application is in automatic control operation, the sensor monitors the thermal runaway state of the electrolyte online and sends the monitoring data to the controller II. After the controller II receives the data transmitted by the front end, it compares it with the preset value, determines the execution instruction, and sends the execution instruction to the corresponding control valve II to achieve the purpose of automatic monitoring and automatic valve opening.

[0042] Optionally, the controller II is selected from a programmable industrial controller.

[0043] Optionally, the storage device II includes a water storage bottle and a gas storage bottle arranged in parallel; a control valve III is set at the outlet of the water storage bottle, and a control valve IV is set at the outlet of the gas storage bottle; the control valve III or the control valve IV is electrically connected to the controller II.

[0044] Optionally, the electrolyte outlet of the energy storage unit and the inlet of the function regulation unit are connected through a pipeline, the outlet of the function regulation unit and the inlet of the power unit are connected through a pipeline, and the outlet of the power unit and the electrolyte inlet of the energy storage unit are connected through a pipeline.

[0045] Optionally, the monitoring device 1 and the liquid storage device 1 are connected through a pipeline, the liquid storage device 1 and the regulating device 1 are connected through a pipeline, and the regulating device 1 and the additive storage device 1 are connected through a pipeline.

[0046] Optionally, the storage device II and the regulating device II are connected via a pipeline, and the regulating device II and the injection inlet of the single cell are connected via a pipeline.

[0047] Optionally, the battery cell unit includes n single batteries, 1≤n≤10000000.

[0048] Optionally, the battery cell unit includes n single batteries, 1≤n≤1000000 or 1≤n≤100000 or 1≤n≤10000 or 1≤n≤1000 or 1≤n≤500 or 1≤n≤300 or 1≤n≤100, etc. The number of single batteries can be designed according to actual needs.

[0049] Optionally, the power unit includes a circulation pump.

[0050] Compared with the prior art, this application has the following beneficial effects:

[0051] The present application provides an electrolyte management system for energy storage lithium batteries, which can not only monitor the chemical state of the electrolyte and analyze its components in real time, but also perform timely and active regulation to maintain the optimal state of the electrolyte components and extend the cycle life of the single cell; the management system can also determine the thermal runaway threshold and quickly prevent thermal runaway through a safety control unit, thereby ensuring the safety of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] FIG1 is a schematic structural diagram of an electrolyte management system for an energy storage lithium battery provided in this application;

[0053] FIG2 is a comparison diagram of the surface temperature of a single cell in the electrolyte management system of the energy storage battery provided by the present application during charging and discharging and the surface temperature of an ordinary battery during charging and discharging;

[0054] Among them, the charge and discharge current is 10A, and the charge and discharge process is carried out at room temperature;

[0055] FIG3 is a comparison diagram of the discharge capacity of a single cell during the charge and discharge cycle of the electrolyte management system of the energy storage battery provided by the present application and the discharge capacity during the charge and discharge cycle of an ordinary battery;

[0056] Among them, the charging and discharging current is 3.2A, and the charging and discharging process is carried out at room temperature.

[0057] Reference numerals:

[0058] 1 energy storage unit, 1-1 electrolyte total inlet, 1-2 electrolyte total outlet, 1-3 single cell, 1-3-1 injection inlet (water (gas) injection port), 1-3-2 single cell electrolyte inlet, 1-3-3 single cell electrolyte outlet;

[0059] 2 functional control unit, 2-1 optical window, 2-2 spectrometer, 2-3 electrolyte tank, 2-4 control valve I, 2-5 additive storage bin, 2-6 controller I;

[0060] 3 Safety control unit, 3-1 Temperature sensor, 3-2 Gas sensor, 3-3 Control valve II, 3-4 Controller II, 3-5 Storage device II, 3-5-1 Water storage bottle, 3-5-2 Gas storage bottle;

[0061] 4 power units. DETAILED DESCRIPTION

[0062] The present application will be further described below in conjunction with specific embodiments. The following description is merely a few embodiments of the present application and does not limit the present application in any form. Although the present application discloses the preferred embodiments below, it is not intended to limit the present application. Any person skilled in the art who, without departing from the scope of the technical solution of the present application, makes slight changes or modifications using the above disclosed technical content is equivalent to an equivalent implementation case and falls within the scope of the technical solution.

[0063] Unless otherwise specified, the raw materials in the examples of this application were purchased from commercial channels and used directly without any special treatment.

[0064] Example 1

[0065] An electrolyte management system for an energy storage lithium battery, comprising an energy storage unit 1, a function control unit 2, a power unit 4, and a safety control unit 3; the total electrolyte outlet 1-2 of the energy storage unit 1 is connected to the inlet of the function control unit 2, the outlet of the function control unit 2 is connected to the inlet of the power unit, the outlet of the power unit 4 is connected to the total electrolyte inlet 1-1 of the energy storage unit 1; the outlet of the safety control unit 3 is connected to the injection inlet 1-3-1 of the energy storage unit 1; wherein the energy storage unit 1 comprises a battery module consisting of a plurality of single cells 1-3 connected in series or in parallel; the function control unit 2 comprises ... It includes a monitoring device I, a liquid storage device I, a control device I, and an additive storage device I that are connected in sequence; the control device I is used to transport the material I in the additive storage device I to the liquid storage device I according to the detection results of the monitoring device I on the electrolyte components; the safety control unit 3 includes a monitoring device II, a connected control device II and a storage device II; the control device II is used to transport the material II in the storage device II to the battery cell unit according to the detection results of the monitoring device II on the electrolyte temperature, pressure and gas concentration; the power unit 4 is used for the circulation of energy storage lithium battery electrolyte.

[0066] Example 2 (manual control)

[0067] An electrolyte management system for an energy storage lithium battery, as shown in FIG1 , includes an energy storage unit 1 , a function control unit 2 , a safety control unit 3 and a power unit 4 ;

[0068] The energy storage unit 1 is provided with an electrolyte main inlet 1-1 and an electrolyte main outlet 1-2. It is a battery cell module composed of 10 single cells 1-3 connected in series. Each single cell 1-3 is provided with a water (gas) port 1-3-1, an inlet 1-3-2, and an outlet 1-3-3.

[0069] The function control unit 2 includes an optical window 2-1, an electrolyte cell 2-3, a control valve 2-4, and an additive storage compartment 2-5, which are connected in sequence by pipes; it also includes a spectrometer 2-2, which is a Raman spectrometer, an infrared spectrometer, and an ultraviolet spectrometer, respectively used to monitor the status of specific components of the electrolyte; wherein, the additive storage compartment 2-5 is provided with 6 parallel groups, respectively storing lithium hexafluorophosphate, hexamethyldisilazane, dicyclohexylcarbodiimide, pyridine, tributylamine, vinylene carbonate, or fluoroethylene carbonate; the electrolyte cell 1-3 is also provided with multiple additive inlets, the outlet of each additive storage compartment 2-5 is connected to the inlet of the control valve 2-4 via a pipe, and the outlet of each control valve 2-4 is connected to the additive inlet of the electrolyte cell 2-3 via a pipe;

[0070] The total electrolyte outlet 1-2 of the energy storage unit is connected to the inlet of the optical window 2-1 through a pipe, the outlet of the optical window 2-1 is connected to the inlet of the electrolyte pool 2-3 through a pipe, the outlet of the electrolyte pool 2-3 is connected to the inlet of the power unit 4 through a pipe, and the outlet of the power unit 4 is connected to the total electrolyte inlet 1-1 of the energy storage unit through a pipe;

[0071] The safety control unit 3 includes a control valve 3-3 and a storage device 3-5 connected by a pipeline. A water storage bottle 3-5-1 and a gas storage bottle 3-5-2 are arranged in parallel in the storage device 3-5. A control valve III is set at the outlet of the water storage bottle, and a control valve IV is set at the outlet of the gas storage bottle. Each single cell injection inlet 1-3-1 is connected to the outlet of the corresponding control valve 3-3 through a pipeline, and the inlet of the corresponding control valve 3-3 is connected to the outlet of the storage device 3-5 through a pipeline. Each single cell electrolyte outlet 1-3-3 is equipped with a temperature sensor 3-1 and three gas sensors 3-2, including C x H y O z Gas sensor, CO gas sensor and H2 gas sensor.

[0072] The operating method of the electrolyte management system of the energy storage lithium battery of this application:

[0073] A suitable spectrometer is used to monitor the chemical composition status of the electrolyte flowing through the electrolyte in real time online in the optical window, and the monitoring results are read manually. According to the operating experience, it is judged that the corresponding additive should be added to the electrolytic cell, and the control valve 2-4 of the corresponding additive storage bin is manually opened; for example, when the relative intensity of the characteristic peak of lithium salt in the electrolyte is monitored to be weakened, the control valve of the corresponding additive storage bin is manually opened, and a certain amount of lithium salt is added to the electrolytic cell to restore the electrolyte composition to the optimal state; when the characteristic peak of water or HF in the electrolyte is monitored to be relatively enhanced, the valve of the corresponding additive storage bin is manually opened, and one or more water-removing additives such as hexamethyldisilazane, dicyclohexylcarbodiimide, pyridine, and tributylamine are added to the electrolyte storage tank; when the relative intensity of the characteristic peak of vinylene carbonate or fluoroethylene carbonate, an additive that helps the cycle life, is monitored in the electrolyte After weakening, manually open the corresponding additive storage tank valve and add vinylene carbonate or fluoroethylene carbonate to the electrolyte storage tank to achieve component balance of the electrolyte additive; when it is monitored that the characteristic peak position and intensity of the main component and the additive in the electrolyte deviate significantly, the electrolyte tank 2-3 can be directly replaced and the circulation pump 4 can be used to quickly replace the electrolyte in the system; according to the measurement results of the temperature sensor and gas sensor at the outlet of the single cell, the monitoring results are manually read to determine the target single cell with thermal runaway, and then the control valve 3-3 of the water (gas) inlet 1-3-1 of the single cell is manually opened, and the electrolyte inlet 1-3-2 and the electrolyte outlet 1-3-3 of the single cell are closed, and the gas cylinder or water cylinder quickly introduces inert gas or water into the interior of the target single cell with thermal runaway to quickly prevent the occurrence of thermal runaway without damaging other single cells.

[0074] Example 3 (automatic control)

[0075] An electrolyte management system for an energy storage lithium battery, as shown in FIG1 , includes an energy storage unit 1 , a function control unit 2 , a power unit 4 and a safety control unit 3 ;

[0076] The energy storage unit 1 is provided with an electrolyte main inlet 1-1 and an electrolyte main outlet 1-2. It is a battery cell module composed of 10 single cells 1-3 connected in series. Each single cell 1-3 is provided with an injection port 1-3-1, an inlet 1-3-2, and an outlet 1-3-3.

[0077] The function control unit 2 includes an optical window 2-1, an electrolyte cell 2-3, a control valve 2-4, an additive storage bin 2-5, and a controller 2-6, which are sequentially connected by pipelines; it also includes a spectrometer 2-2, which is a Raman spectrometer, an infrared spectrometer, and an ultraviolet spectrometer, respectively used to monitor the status of specific components of the electrolyte; wherein the additive storage bin 2-5 is provided with 6 parallel groups, respectively storing lithium hexafluorophosphate, hexamethyldisilazane, dicyclohexylcarbodiimide, pyridine, tributylamine, vinylene carbonate, or fluoroethylene carbonate; the electrolyte cell 1-3 is also provided with multiple additive inlets, the outlet of each additive storage bin 2-5 is connected to the inlet of the corresponding control valve 2-4 through a pipeline, and the outlet of each control valve 2-4 is connected to the additive inlet of the electrolyte cell 2-3 through a pipeline, the spectrometer 2-2 and the controller 2-6 are connected by wires, and the controller 2-6 and the control valve 2-4 are connected by electrical signals;

[0078] The total electrolyte outlet 1-2 of the energy storage unit is connected to the inlet of the optical window 2-1 through a pipe, the outlet of the optical window 2-1 is connected to the inlet of the electrolyte pool 2-3 through a pipe, the outlet of the electrolyte pool 2-3 is connected to the inlet of the power unit 4 through a pipe, and the outlet of the power unit 4 is connected to the total electrolyte inlet 1-1 of the energy storage unit through a pipe;

[0079] The safety control unit 3 includes a control valve 3-3, a storage device 3-5, and a controller 3-4 connected by a pipeline; a water storage bottle 3-5-1 and a gas storage bottle 3-5-2 are arranged in parallel in the storage device 3-5; a control valve III is set at the outlet of the water storage bottle, and a control valve IV is set at the outlet of the gas storage bottle; the injection inlet 1-3-1 of each single cell is connected to the outlet of the corresponding control valve 3-3 through a pipeline, and the inlet of the corresponding control valve 3-3 is connected to the outlet of the storage device 3-5 through a pipeline; each single cell electrolyte outlet 1-3-3 is equipped with a temperature sensor 3-1 and three gas sensors 3-2, including C x H y O z The gas sensor, CO gas sensor and H2 gas sensor; the temperature sensor 3-1, the gas sensor 3-2 are all connected to the controller 3-4 through wires, and the control valve 3-3 and the controller 3-4 are connected through electrical signals.

[0080] The operating method of the electrolyte management system of the energy storage lithium battery of this application:

[0081] A suitable spectrometer is used to monitor the chemical composition status of the electrolyte flowing through the optical window in real time online, and the monitoring data is sent to the controller 2-6. After receiving the data transmitted by the front end, the controller 2-6 determines the execution instruction and sends the execution instruction to the corresponding control valve 2-4 to achieve the purpose of automatic monitoring and automatic valve opening. For example, when the relative intensity of the characteristic peak of lithium salt in the electrolyte is detected to be weakened, the control valve of the corresponding additive storage bin is automatically opened, and a certain amount of lithium salt is added to the electrolytic cell to restore the electrolyte components to the optimal state; when the spectrometer detects that the characteristic peak of water or HF in the electrolyte is relatively enhanced, the controller 2-6 sends a signal to the control valve 2-4, the control valve of the corresponding additive storage bin is opened, and one or more water removal additives such as hexamethyldisilazane, dicyclohexylcarbodiimide, pyridine, and tributylamine are actively added to the electrolyte cell; when the relative intensity of the characteristic peak of vinylene carbonate or fluoroethylene carbonate, an additive that contributes to the cycle life of the electrolyte, is detected to be weakened, the controller sends a signal to the control valve, the control valve of the corresponding additive storage bin is opened, and vinylene carbonate or fluoroethylene carbonate is actively added to the electrolyte cell, thereby achieving the component balance of the electrolyte additive; when the characteristic peak position and intensity of the main component and the additive in the electrolyte are detected to deviate significantly, the electrolyte cell can be directly replaced and the circulation pump can be used to quickly replace the electrolyte in the system. The temperature sensor and gas sensor at the outlet of the single cell send the measurement results to the controller 3-4, and the controller makes a timely judgment on the thermal runaway threshold. When the monitoring is abnormal, the controller sends an opening signal to the control valve 3-2 of the corresponding single cell, and the control valve 3-3 of the water (gas) injection port of the corresponding single cell automatically opens, and closes the electrolyte inlet 1-3-2 and the electrolyte outlet 1-3-3 of the single cell. The gas cylinder or water cylinder quickly introduces inert gas or water into the target single cell of thermal runaway, quickly preventing the occurrence of thermal runaway without damaging other single cells.

[0082] The battery surface temperature during the charging and discharging of a single battery and a common battery in the management system of Examples 2 and 3 of the present application is detected, and the results are shown in Figure 2 (the charging and discharging current is 10A, and the charging and discharging process is carried out at room temperature). It can be clearly seen from Figure 2 that the maximum surface temperature of the battery in the experimental group is lower than the maximum surface temperature of the common battery, indicating that the energy storage lithium battery electrolyte management system developed by the present application can significantly control the temperature fluctuations during the battery charging and discharging process.

[0083] The discharge capacity of the single battery charge and discharge cycle process and the ordinary battery charge and discharge cycle process in the management system of Examples 2 and 3 of the present application was tested, and the results are shown in Figure 3 (the charge and discharge current is 3.2A, and the charge and discharge process is carried out at room temperature); it can be clearly seen from Figure 3 that the discharge capacity of the experimental group battery after 100 charge and discharge cycles is approximately twice the discharge capacity of the control group battery after 100 charge and discharge cycles, indicating that the energy storage lithium battery electrolyte management system developed by the present application can significantly extend the cycle life of the single battery.

[0084] The electrolyte management system for the energy storage lithium battery of the present application can not only monitor the chemical state of the electrolyte and analyze its components in real time, but also perform timely and active regulation to maintain the optimal state of the electrolyte components and extend the cycle life of the single cell; the management system can also determine the thermal runaway threshold and quickly prevent thermal runaway through the safety control unit, thereby ensuring the safety of the energy storage system.

[0085] The above descriptions are merely a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application discloses the preferred embodiments as above, they are not intended to limit the present application. Any technical personnel familiar with the present profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. An electrolyte management system for an energy storage lithium battery, characterized in that: The system includes an energy storage unit, a function control unit, a power unit and a safety control unit; The total electrolyte outlet of the energy storage unit is connected to the inlet of the function control unit, the outlet of the function control unit is connected to the inlet of the power unit, the outlet of the power unit is connected to the total electrolyte inlet of the energy storage unit; the outlet of the safety control unit is connected to the injection inlet of the energy storage unit; Wherein, the energy storage unit includes a battery cell unit composed of a plurality of single batteries; The functional control unit includes a monitoring device 1, a liquid storage device 1, a control device 1, and an additive storage device 1 that are connected; the control device 1 is used to transport the material 1 in the additive storage device 1 to the liquid storage device 1 according to the detection results of the electrolyte components by the monitoring device 1; The safety control unit includes a monitoring device II, a connected control device II and a storage device II; the control device II is used to deliver the material II in the storage device II to the battery cell unit according to the detection results of the electrolyte temperature, pressure and gas concentration by the monitoring device II; The power unit is used for circulating the electrolyte of the energy storage lithium battery.

2. The electrolyte management system of an energy storage lithium battery according to claim 1, characterized in that: The monitoring device I includes an optical window and a component detection device; The component detection equipment is selected from at least one of a Raman spectrometer, an infrared spectrometer and an ultraviolet spectrometer.

3. An electrolyte management system for an energy storage lithium battery according to claim 1 or 2, characterized in that: The control device 1 includes a control valve 1; The additive storage device 1 includes a plurality of additive storage bins arranged in parallel; The control valve I is arranged between the outlet of each additive storage bin and the additive inlet of the liquid storage device I.

4. An electrolyte management system for an energy storage lithium battery according to any one of claims 1 to 3, characterized in that: The control device 1 also includes a controller 1; The component detection device is electrically connected to the controller 1, and the controller 1 is electrically connected to the control valve 1.

5. The electrolyte management system for an energy storage lithium battery according to any one of claims 1 to 4, characterized in that: The monitoring device II is selected from a temperature sensor, C x H y O z At least one of a gas sensor, a CO gas sensor, and a H2 gas sensor.

6. An electrolyte management system for an energy storage lithium battery according to any one of claims 1 to 5, characterized in that: The monitoring device II is provided at the electrolyte outlet of each single cell.

7. An electrolyte management system for an energy storage lithium battery according to any one of claims 1 to 6, characterized in that: The control device II includes a control valve II; The injection inlet of the energy storage unit includes an injection inlet provided on each single cell; The control valve II is provided between the injection inlet of each single cell and the outlet of the storage device II.

8. An electrolyte management system for an energy storage lithium battery according to any one of claims 1 to 7, characterized in that: The control device II also includes a controller II; The monitoring device II is electrically connected to the controller II, and the controller II is electrically connected to the control valve II.

9. An electrolyte management system for an energy storage lithium battery according to any one of claims 1 to 8, characterized in that: The storage device II includes a water storage bottle and a gas storage bottle arranged in parallel; a control valve III is set at the outlet of the water storage bottle, and a control valve IV is set at the outlet of the gas storage bottle; the control valve III or the control valve IV is electrically connected to the controller II.

10. An electrolyte management system for an energy storage lithium battery according to any one of claims 1 to 9, characterized in that: The battery cell unit includes n single batteries, 1≤n≤10000000; the power unit includes a circulation pump.

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