CN216818433U - Immersion type explosion-proof lithium battery PACK system based on high boiling point fluorinated liquid - Google Patents
Immersion type explosion-proof lithium battery PACK system based on high boiling point fluorinated liquid Download PDFInfo
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Abstract
The utility model provides an immersion type explosion-proof lithium battery PACK system based on high boiling point fluorinated liquid, which comprises a battery cell, fluorinated liquid, a customized structure and a battery management unit, wherein the battery management unit is used for managing the battery cell; the customization structure is a sealed box body structure, the customization structure is filled with a fluorination liquid, the battery cell is placed in the customization structure, and the battery cell is completely immersed in the fluorination liquid; the battery management unit is arranged on the customized structure, is positioned outside the customized structure and is connected with the battery core.
Description
Technical Field
The utility model relates to the technical field of electrochemical safety and reliability energy storage, in particular to an immersion type explosion-proof lithium battery PACK system based on high-boiling-point fluorinated liquid.
Background
With the continuous improvement of new energy loading capacity, the share of green energy in the energy field is continuously increased, and the consumption of new energy power generation becomes a big problem in the energy field. At present, in the field of energy storage, electrochemical energy storage, particularly energy storage of lithium batteries, faces a plurality of problems, and the safety of energy storage becomes the primary technical problem in the energy storage industry. The traditional lithium battery energy storage PACK mostly adopts forced air cooling, and partial enterprises adopt water cooling plates for heat dissipation, so that the heat runaway of the battery can not be reliably prevented in the modes.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an immersed explosion-proof lithium battery PACK system based on high-boiling-point fluorinated liquid, which effectively solves the safety problem of a lithium battery energy storage system, emphatically solves the problems of thermal consistency and thermal runaway and the problem of battery core deflagration under extreme conditions, and effectively protects operation and maintenance personnel and power stations.
In order to achieve the above purpose, the utility model provides the following technical scheme: a high-boiling-point fluorinated liquid-based immersed explosion-proof lithium battery PACK system comprises a battery cell, fluorinated liquid, a customized structure and a battery management unit; the customized structure is a sealed box structure, the customized structure is filled with the fluorinated liquid, the battery cell is placed in the customized structure, and the battery cell is completely immersed in the fluorinated liquid; the battery management unit is arranged on the customization structure, is positioned outside the customization structure and is connected with the battery core.
Furthermore, in the immersed explosion-proof lithium battery PACK system based on the high-boiling-point fluorinated liquid, the system further comprises a lead, and a monitoring point is arranged on the battery cell; the battery management unit is arranged on the upper surface of the customization structure and is connected with the monitoring point through the lead.
Further, in the above immersed explosion-proof lithium battery PACK system based on the high boiling point fluorinated liquid, the number of the battery cells is multiple, and a topological structure formed by the multiple battery cells is a single cascade structure.
Further, in the above immersed explosion-proof lithium battery PACK system based on the high boiling point fluorinated liquid, the battery management unit includes a temperature monitoring system and a voltage monitoring system; the voltage monitoring system is used for detecting and balancing the voltage of each battery cell; the temperature monitoring system is used for detecting the temperature of the battery cell.
Further, in the above immersed explosion-proof lithium battery PACK system based on the high boiling point fluorinated liquid, the battery management unit further includes a liquid level monitoring system and an energy management system; the liquid level monitoring system is used for detecting the liquid level of the fluorinated liquid; the energy management system is used for monitoring the discharge depth and the charge state of the battery cell and preventing the battery cell from being overcharged or overdischarged, and the energy management system controls the discharge allowance according to the actual working condition and the use intensity of the battery cell.
Further, in the above immersed explosion-proof lithium battery PACK system based on the high boiling point fluorinated liquid, the temperature monitoring system, the voltage monitoring system, the liquid level monitoring system and the energy management all transmit signals to an upper system through a CAN bus.
Further, in the immersed explosion-proof lithium battery PACK system based on the high-boiling-point fluorinated liquid, the system further comprises a liquid level sensor, the liquid level sensor is arranged in the customized structure, and the liquid level monitoring system is connected with the liquid level sensor; the liquid level monitoring system detects the liquid level of the fluorinated liquid through the liquid level sensor.
Further, in the above-mentioned an immersion type explosion-proof lithium cell PACK system based on high boiling point fluorinated liquid, the customization structure is stainless steel.
Further, in the immersed explosion-proof lithium battery PACK system based on the high-boiling-point fluorinated liquid, the boiling point of the fluorinated liquid is higher than 100 ℃, the specific heat capacity of the fluorinated liquid is higher than 1100J/kg ℃, and the dielectric strength of the fluorinated liquid is higher than 20 kV/mm.
Analysis shows that the embodiment of the immersed explosion-proof lithium battery PACK system based on the high-boiling-point fluorinated liquid disclosed by the utility model realizes the following technical effects: this explosion-proof lithium cell PACK system of immersion type based on high boiling fluoridizes liquid solves energy storage electric core safety problem from three angle: the fluorination liquid is selected, so that all parameters of the fluorination liquid meet the problems of cooling, blocking electrochemical reaction and high permeability, and a special structure is manufactured, so that the deflagration is not generated even under the uncontrolled condition, and the reaction is blocked along with the time. The problem of voltage balance is solved through a special battery cell topological structure. The BMU is customized by the characteristics of the battery cell, so that the charging and discharging process is accurate and controllable. The thermal consistency problem of the battery is guaranteed in principle, the electrochemical reaction of the lithium battery is prevented in time after thermal runaway so as to achieve the explosion-proof effect, and the requirement of an explosion-proof battery PACK system is met by the battery PACK structure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. Wherein:
FIG. 1 is a system diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the utility model.
Description of reference numerals: 1 customizing a structure; 2 a battery management unit; 3, an electric core; 4 liquid level sensor.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the utility model, and not limitation of the utility model. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
One or more examples of the utility model are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the utility model. As used herein, the terms "first," "second," "third," and "fourth," etc. may be used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of an individual component.
As shown in fig. 1 to 3, according to an embodiment of the present invention, there is provided an immersion type explosion-proof lithium battery PACK system based on a high boiling point fluorinated liquid, including a cell, a fluorinated liquid, a customized structure, and a battery management unit; the customization structure is a sealed box body structure, the customization structure is filled with a fluorination liquid, the electric core is placed in the customization structure, and the electric core is completely immersed in the fluorination liquid; the battery management unit is arranged on the customization structure, the battery management unit is located outside the customization structure, and the battery management unit is connected with the battery core.
In the above embodiment, this immersion type explosion-proof lithium BATTERY PACK system based on high boiling point fluorinated liquid includes electric core, fluorinated liquid, customization structure and BATTERY management unit BMU (BATTERY MANAGEMENT SYSTEM), high boiling point means that the boiling point of fluorinated liquid is higher than 100 ℃, the customization structure is sealed box structure, it contains fluorinated liquid in the customization structure, electric core is put in the customization structure, BATTERY management unit BMU fixed mounting is on the customization structure, BATTERY management unit is connected with electric core, electric core is all immersed in fluorinated liquid, fluorinated liquid is than the heat capacity greatly, thermal balance is good, be superior to popular air cooling, water-cooling plate cooling mode. According to the method, the fluorination liquid is selected, each parameter meets the problems of cooling, blocking electrochemical reaction and high permeability, a special structure is manufactured, even if uncontrolled conditions do not explode, the reaction is blocked along with the time. The explosion-proof principle of the utility model is that after the thermal runaway of the battery, the high boiling point fluorinated liquid is rapidly cooled by adopting a phase change cooling technology, when the leakage of the battery occurs, the fluorinated liquid rapidly enters a fault point to be prevented, and the continuous reaction is prevented by the high permeability and the high dielectric strength of the fluorinated liquid. Customizing a battery management unit BMU according to the characteristics of the battery core, wherein the customized battery management unit BMU is customized for the resource amount so as to be matched with a customized structure for use, and the charging and discharging process of the battery core is accurate and controllable. This application has guaranteed the thermal unanimous difficult problem of battery from the principle, guarantees in time to prevent lithium cell electrochemical reaction in order to reach explosion-proof effects after the thermal runaway, guarantees that this battery PACK structure satisfies explosion-proof battery PACK system requirement.
Preferably, as shown in fig. 1 and fig. 2, in an embodiment of the present invention, the battery further includes a lead, and the battery cell is provided with a monitoring point; the battery management unit is arranged on the upper surface of the customized structure and is connected with the monitoring point through a lead. The monitoring points on the battery cell are connected to the battery management unit BMU through the lead wires, so that the battery management unit BMU gives consideration to all parameters of the battery cell and keeps the consistency of all parameters of the battery cell as much as possible, the battery management unit BMU sets and protects all boundary values, and meanwhile, the battery management unit BMU has a communication function.
Preferably, as shown in fig. 1 and fig. 2, in an embodiment of the present invention, the number of the battery cells is multiple, a topology structure formed by multiple battery cells is a single-body cascade structure, so that the voltage-sharing problem of multiple battery cell topologies is solved, the number of temperature monitoring points is greatly reduced, and the voltage consistency is greatly enhanced compared with the currently popular battery cell topology 2PnS or 3 PnS.
Preferably, as shown in fig. 1, in an embodiment of the present invention, a fluorinated liquid with a high boiling point, a low viscosity, a high specific heat capacity, a low expansion coefficient, and a high dielectric constant is used, and the fluorinated liquid is non-toxic and harmless, and meets the requirement of thermal uniformity of the battery cell, which is significantly better than the conventional heat dissipation. Through simulation calculation, the proportion of the quality of the fluorinated liquid to the capacity of the battery cell is optimized, and due to strong permeability and high dielectric coefficient, thermal runaway is solved from the source at the initial stage of lithium battery failure, and deflagration is avoided.
Preferably, as shown in fig. 1 and 2, in one embodiment of the present invention, the battery management unit includes a temperature monitoring system, a voltage monitoring system, a liquid level monitoring system, and an energy management system; the voltage monitoring system is used for detecting and balancing the voltage of each battery cell; the temperature monitoring system is used for detecting and controlling the temperature of the battery cell; the liquid level monitoring system is used for detecting the liquid level of the fluorinated liquid; the energy management system is used for monitoring the discharge depth and the charge state of the battery cell and preventing the battery cell from being overcharged or overdischarged; the temperature monitoring system, the voltage monitoring system, the liquid level monitoring system and the energy management all transmit signals to the upper system through the CAN bus. The BMU mainly solves the problems of voltage and temperature monitoring, liquid level monitoring, energy management, communication and the like, and finely adjusts parameters according to the characteristics of the battery cell to ensure that the parameters such as the State of Charge (SOC) and the Depth of discharge (DOD), the temperature, the voltage and the like of an application window are used in a reasonable interval.
Preferably, as shown in fig. 1 and 2, in one embodiment of the present invention, the liquid level monitoring system further comprises a liquid level sensor, the liquid level sensor is arranged in the customized structure, and the liquid level monitoring system is connected with the liquid level sensor; the liquid level monitoring system detects the liquid level of the fluorinated liquid through a liquid level sensor. The liquid level sensor is fixedly arranged in the customized structure to detect the liquid level of the fluorinated liquid, wherein the liquid level detection needs to be acquired in the whole process of battery operation to remind whether the fluorinated liquid is at the specified liquid level.
Preferably, as shown in fig. 1 and fig. 2, in an embodiment of the present invention, the battery cell is provided with a charge cut-off voltage and a discharge cut-off voltage; the voltage monitoring system detects whether the cell voltage reaches a charge cut-off voltage Vuth or a discharge cut-off voltage Vlth, so as to prevent the battery from being damaged by over-charge or over-discharge.
Preferably, the customized structure is made of stainless steel, the thickness of the material is small, and the heat conduction coefficient is large.
The superior system of the utility model comprises an air conditioner; the temperature monitoring system is connected with the air conditioner and controls the air conditioner to work according to the detected temperature of the battery cell so as to control the temperature of the battery cell. In the charging or discharging process, the temperature monitoring system detects the temperature of the battery cell, and when the temperature of the battery cell rises, the air conditioner is forced to cool the environment. The BMU mainly considers parameters of the battery cell and keeps consistency, boundary value setting, protection and communication as much as possible. The overall control is divided into two processes:
1. and (3) charging process: monitoring cell voltages, monitoring the cell voltages and balancing the cell voltages by a voltage monitoring system in a Battery Management Unit (BMU), and detecting whether the cell voltages reach a charge cut-off voltage Vuth or not to prevent the battery from being damaged by overcharging, wherein the Vuth value is defined according to actual conditions;
detecting the temperature of a battery core, detecting the temperature of the battery core by a temperature monitoring system in a Battery Management Unit (BMU), and when the temperature of the battery core rises, forcibly cooling the environment by an air conditioner, and controlling an alarm device to give an alarm when the temperature is abnormal and difficult to cool;
and energy management is used for monitoring the discharge depth and the charge state of the battery cell and preventing the battery cell from being overcharged. In addition, the above processes all carry out CAN communication, and all specific parameter settings are related to the selected battery cell, the use scene and the safety margin.
2. And (3) discharging: monitoring cell voltages, monitoring the cell voltages and balancing the cell voltages by a voltage monitoring system in a Battery Management Unit (BMU), and detecting whether the cell voltages reach a discharge cut-off voltage Vlth or not to prevent the over-discharge from damaging the battery, wherein the size of the Vlth value is specifically defined according to actual conditions;
detecting the temperature of a battery core, detecting the temperature of the battery core by a temperature monitoring system in a Battery Management Unit (BMU), and when the temperature of the battery core rises, forcing an air conditioner to cool the environment, and controlling an alarm device to give an alarm when the temperature is abnormal and difficult to cool;
and energy management is used for monitoring the discharge depth and the charge state of the battery cell and preventing the battery cell from over-discharging. The above processes all carry out CAN communication, and all specific parameter settings are related to the selected battery cell, the use scene and the safety margin.
It should be noted that the above parameters need to be set according to parameters of the battery core, and are given according to an application scenario and a safety margin in a coordinated manner.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
this explosion-proof lithium cell PACK system of immersion type based on high boiling fluoridizes liquid solves energy storage electric core safety problem from three angle: 1) the fluoride liquid is selected, each parameter meets the problems of cooling, blocking electrochemical reaction and high permeability, a special structure is manufactured, and the principle verifies that the deflagration is not generated even if the uncontrolled condition exists and the reaction is blocked along with the time. 2) The special battery cell topological structure solves the voltage balance problem. 3) And customizing the BMU according to the characteristics of the battery cell, so that the charging and discharging process is accurate and controllable.
This application has guaranteed the thermal unanimous difficult problem of battery from the principle, guarantees in time to prevent lithium cell electrochemical reaction in order to reach explosion-proof effects after the thermal runaway, guarantees that this battery PACK structure satisfies explosion-proof battery PACK system requirement.
The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An immersion type explosion-proof lithium battery PACK system based on high boiling point fluorinated liquid is characterized by comprising an electric core, fluorinated liquid, a customized structure and a battery management unit;
the customized structure is a sealed box body structure, the customized structure is filled with the fluorinated liquid, the battery cell is placed in the customized structure, and the battery cell is completely immersed in the fluorinated liquid;
the battery management unit is arranged on the customization structure, is positioned outside the customization structure and is connected with the battery core.
2. The immersed explosion-proof lithium battery PACK system based on the high-boiling-point fluorinated liquid as claimed in claim 1, further comprising a lead, wherein a monitoring point is arranged on the cell;
the battery management unit is arranged on the upper surface of the customization structure and is connected with the monitoring point through the lead.
3. The high-boiling-point fluorinated liquid-based immersion type explosion-proof lithium battery PACK system according to claim 1, wherein the number of the battery cells is multiple, and a topological structure formed by the multiple battery cells is a single-body cascading structure.
4. The immersed explosion-proof lithium battery PACK system based on the high boiling point fluorinated liquid according to claim 3, wherein the battery management unit comprises a temperature monitoring system and a voltage monitoring system;
the voltage monitoring system is used for detecting and balancing the voltage of each battery cell;
the temperature monitoring system is used for detecting the temperature of the battery cell.
5. The high boiling fluorinated liquid-based submersion type explosion-proof lithium battery PACK system according to claim 4, wherein the battery management unit further comprises a liquid level monitoring system and an energy management system;
the liquid level monitoring system is used for detecting the liquid level of the fluorinated liquid;
the energy management system is used for monitoring the discharge depth and the charge state of the battery cell and preventing the battery cell from being overcharged or overdischarged, and the energy management system controls the discharge allowance according to the actual working condition and the use intensity of the battery cell.
6. The high boiling point fluorinated liquid-based immersion type explosion-proof lithium battery PACK system according to claim 5, wherein the temperature monitoring system, the voltage monitoring system, the liquid level monitoring system and the energy management system all transmit signals to an upper system through a CAN bus.
7. The high boiling fluorinated liquid based submersion type explosion-proof lithium battery PACK system according to claim 6, further comprising a liquid level sensor, wherein the liquid level sensor is arranged in the customized structure, and the liquid level monitoring system is connected with the liquid level sensor;
the liquid level monitoring system detects the liquid level of the fluorinated liquid through the liquid level sensor.
8. The high boiling fluorinated liquid-based submersion type lithium ion battery PACK system according to claim 1, wherein the customized structure is made of stainless steel.
9. The high-boiling-point fluorinated liquid-based immersion type explosion-proof lithium battery PACK system of claim 1, wherein the boiling point of the fluorinated liquid is higher than 100 ℃, the specific heat capacity of the fluorinated liquid is more than 1100J/kg ℃, and the dielectric strength of the fluorinated liquid is more than 20 kV/mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115117518A (en) * | 2022-07-13 | 2022-09-27 | 北京电力自动化设备有限公司 | Explosion-proof battery based on high boiling point explosion-proof liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115117518A (en) * | 2022-07-13 | 2022-09-27 | 北京电力自动化设备有限公司 | Explosion-proof battery based on high boiling point explosion-proof liquid |
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