Electrolyte management system of energy storage lithium battery

Abstract

The utility model relates to the field of lithium batteries, in particular to an electrolyte management system of an energy storage lithium battery, which comprises an energy storage unit, a detection unit, a power unit and a regulation and control unit, a liquid outlet of the energy storage unit is communicated with a liquid inlet of the detection unit, a liquid inlet of the energy storage unit is communicated with a liquid outlet of the detection unit, the power unit is arranged between the liquid outlet of the detection unit and the liquid inlet of the energy storage unit, and the detection unit is communicated with the regulation and control unit; the device disclosed by the utility model has the beneficial effects that the electrolyte in each single battery flows into the electrolyte tank and is respectively detected by the spectrum detector, so that the chemical state of the electrolyte and the components of the electrolyte can be monitored in real time, and the additive storage bin is used for regulating and controlling in time; the optimal state of electrolyte components is maintained, the cycle life of a single battery is prolonged, and the safety of an energy storage system is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of lithium batteries, in particular to an electrolyte management system for energy storage lithium batteries. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density, low self-discharge rate, long cycle life, and no memory effect, and are being widely used in the field of energy storage. As lithium-ion batteries are used more and more, the electrolyte inside them will also change, causing battery performance to decay. Some reaction byproducts will further accelerate the decay of battery performance, but the existing battery management system cannot effectively monitor the chemical changes of the electrolyte inside the lithium-ion battery, cannot accurately evaluate the performance status and remaining service life of the battery, and cannot effectively remove these byproducts, resulting in a significant reduction in the cycle life of the lithium-ion battery.

[0003] In the current lithium-ion battery energy storage field, lithium-ion battery modules composed of multiple lithium-ion battery cells connected in series and parallel are mainly used, and multiple lithium-ion battery modules are then connected in series and parallel to form a battery system. In the battery system, the inconsistency of the cells often causes the decay rate of individual cells to accelerate, affecting the life of the battery system. Furthermore, due to long-term improper use of individual inconsistent cells, they may cause internal short circuits, heat accumulation and other problems, and eventually lead to thermal runaway, thereby affecting multiple closely arranged batteries in the system, causing larger-scale thermal runaway, and affecting the safety of the battery system. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings, the utility model provides a technical solution that can solve the above-mentioned problems.

[0005] An electrolyte management system for an energy storage lithium battery, comprising an energy storage unit, a detection unit, a power unit, and a control unit;

[0006] The liquid outlet of the energy storage unit is connected to the liquid inlet of the detection unit, the liquid inlets of the energy storage unit are connected to the liquid outlets of the detection unit, the power unit is arranged between the liquid outlet of the detection unit and the liquid inlet of the energy storage unit, and the detection unit and the control unit are connected to each other;

[0007] The energy storage unit includes a battery cell unit composed of multiple single batteries;

[0008] The detection unit includes a plurality of electrolyte cells connected to the single cells, and one side of each electrolyte cell is connected to a spectrum detector;

[0009] The control unit includes an additive storage bin, and the additive storage bins are respectively connected to the electrolyte cells;

[0010] The power unit is used for the circulation of electrolyte in energy storage lithium batteries.

[0011] As a further solution of the utility model: the detection unit also includes a temperature sensor and a gas sensor, and the detection ends of the temperature sensor and the gas sensor are respectively arranged at the liquid outlet of the single battery.

[0012] As a further solution of the utility model: the control unit also includes a controller, and the controller is electrically connected to the spectrum detector, the additive storage bin, the temperature sensor, and the gas sensor.

[0013] As a further solution of the utility model: an electric control valve electrically connected to the controller is provided between the liquid outlet of each single battery and the electrolyte pool.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: the electrolyte in each single cell flows into the electrolyte pool, and the electrolyte of each single cell is detected separately by a spectrometer, which can not only monitor the chemical state of the electrolyte and analyze its components in real time, but also timely regulate and control it through the additive storage bin to maintain the optimal state of the electrolyte components, extend the cycle life of the single cell, and ensure the safety of the energy storage system.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] As shown in the figure: 1. Single battery; 2. Electrolyte cell; 3. Spectrometer; 4. Additive storage bin; 5. Power unit; 6. Temperature sensor; 7. Gas sensor; 8. Controller; 9. Electric control valve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figure 1 , an electrolyte management system for an energy storage lithium battery, comprising an energy storage unit, a detection unit, a power unit 5, and a control unit;

[0024] The liquid outlet of the energy storage unit is interconnected with the liquid inlet of the detection unit, and the liquid inlets of the energy storage unit are respectively interconnected with the liquid outlets of the detection unit, the power unit 5 is arranged between the liquid outlet of the detection unit and the liquid inlet of the energy storage unit, and the detection unit and the control unit are interconnected;

[0025] The energy storage unit includes a battery cell unit composed of a plurality of single batteries 1;

[0026] The detection unit includes a plurality of electrolyte cells 2 correspondingly connected to the single cells 1, and one side of each electrolyte cell 2 is respectively connected to a spectrum detector 3;

[0027] The control unit includes an additive storage bin 4, and the additive storage bins 4 are respectively connected to the electrolyte tank 2;

[0028] The power unit 5 is used for circulating the electrolyte of the energy storage lithium battery.

[0029] By having the electrolyte in each single cell 1 flow into the electrolyte pool 2, and the electrolyte in each single cell 1 is detected by the spectrometer 3, not only can the chemical state of the electrolyte be monitored in real time and its components be analyzed, but also timely regulation can be carried out through the additive storage bin 4, and then the electrolyte in the electrolyte pool 2 is transmitted back to the single cell 1 through the power unit 5, so as to maintain the optimal state of the electrolyte components, extend the cycle life of the single cell 1, and ensure the safety of the energy storage system.

[0030] Furthermore, the detection unit also includes a temperature sensor 6 and a gas sensor 7 , and detection ends of the temperature sensor 6 and the gas sensor 7 are respectively arranged at the liquid outlet of the single battery 1 .

[0031] The temperature and gas change state of each single battery 1 can be accurately monitored to prevent thermal runaway and ensure the safety of the energy storage system.

[0032] Furthermore, the control unit also includes a controller 8, and the controller 8 is electrically connected to the spectrum detector 3, the additive storage bin 4, the temperature sensor 6, and the gas sensor 7 respectively.

[0033] It is capable of realizing automatic control operation. The spectrometer 3 performs real-time detection on the electrolyte. The temperature sensor 6 and the gas sensor 7 monitor the temperature and gas change state of the single cell 1 in real time. The thermal runaway state of the electrolyte is detected online, and the monitored value is transmitted to the controller 8. The controller 8 compares it with the preset value, determines the execution instruction, and the additive storage bin 4 transmits various additives to the electrolyte pool 2. Water or inert gas can also be injected into the single cell 1 to quickly and effectively prevent the occurrence of further thermal failure without damaging other single cells 1.

[0034] Furthermore, an electric control valve 9 electrically connected to the controller 8 is provided between the liquid outlet of each single cell 1 and the electrolyte pool 2 .

[0035] The flow rate of the electrolyte in the single cell 1 into the electrolyte tank 2 can be adjusted to ensure that the electrolyte in the single cell 1 is stable.

[0036] Furthermore, the power unit 5 includes a circulation pump.

[0037] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "including a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electrolyte management system for an energy storage lithium battery, characterized in that: It includes an energy storage unit, a detection unit, a power unit (5), and a control unit; The liquid outlet of the energy storage unit is connected to the liquid inlet of the detection unit, the liquid inlets of the energy storage unit are connected to the liquid outlets of the detection unit, the power unit (5) is arranged between the liquid outlet of the detection unit and the liquid inlet of the energy storage unit, and the detection unit and the control unit are connected to each other; The energy storage unit comprises a battery cell unit composed of a plurality of single batteries (1); The detection unit comprises a plurality of electrolyte cells (2) connected to the single cells (1) respectively, and one side of each electrolyte cell (2) is connected to a spectrum detector (3); The control unit comprises an additive storage bin (4), and the additive storage bin (4) is respectively connected to the electrolyte cell (2); The power unit (5) is used for circulating the electrolyte of the energy storage lithium battery.

2. The electrolyte management system for energy storage lithium battery according to claim 1, characterized in that: The detection unit also includes a temperature sensor (6) and a gas sensor (7), and detection ends of the temperature sensor (6) and the gas sensor (7) are respectively arranged at the liquid outlet of the single battery (1).

3. The electrolyte management system for energy storage lithium battery according to claim 2, characterized in that: The control unit further comprises a controller (8), and the controller (8) is electrically connected to the spectrum detector (3), the additive storage bin (4), the temperature sensor (6), and the gas sensor (7).

4. The electrolyte management system for energy storage lithium battery according to claim 3, characterized in that: An electric control valve (9) electrically connected to the controller (8) is provided between the liquid outlet of each single battery (1) and the electrolyte pool (2).

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