阅读说明：本技术 一种移动式储能应急保障电源低温启动系统及其控制方法 (Mobile energy storage emergency guarantee power supply low-temperature starting system and control method thereof ) 是由 陶以彬 吴福保 冯鑫振 杨波 王德顺 薛金花 周晨 鄢盛驰 李跃龙 蔡德龙 于 2021-09-29 设计创作，主要内容包括：本发明涉及电池保护技术领域,具体提供了一种移动式储能应急保障电源低温启动系统及其控制方法,包括：电源装置和依次连接在主循环回路上的储水箱、水泵和加热罐,所述主循环回路的两个端口接入电池组冷板；所述水泵,用于为主循环回路内部导热介质提供循环动力；所述储水箱,用于存储导热介质；所述加热罐,用于对导热介质进行加热；所述电池组冷板,用于对导热介质与被加热电池的电芯进行热交换；所述电源装置,用于向系统提供电能。该方案实现了高寒环境下电池的正常启动。(The invention relates to the technical field of battery protection, and particularly provides a mobile energy storage emergency guarantee power supply low-temperature starting system and a control method thereof, wherein the mobile energy storage emergency guarantee power supply low-temperature starting system comprises the following steps: the system comprises a power supply device, a water storage tank, a water pump and a heating tank which are sequentially connected to a main circulation loop, wherein two ports of the main circulation loop are connected to a battery pack cold plate; the water pump is used for providing circulating power for the heat-conducting medium in the main circulating loop; the water storage tank is used for storing a heat-conducting medium; the heating tank is used for heating the heat-conducting medium; the battery pack cold plate is used for carrying out heat exchange on the heat-conducting medium and the electric core of the heated battery; and the power supply device is used for supplying electric energy to the system. This scheme has realized the normal start of battery under the severe cold environment.)

1. A mobile energy storage emergency support power supply low-temperature starting system is characterized by comprising: the system comprises a water storage tank, a water pump and a heating tank which are sequentially connected to a main circulation loop, wherein two ports of the main circulation loop are connected to a battery pack cold plate;

the water pump is used for providing circulating power for the heat-conducting medium in the main circulating loop;

the water storage tank is used for storing a heat-conducting medium;

the heating tank is used for heating the heat-conducting medium;

the battery pack cold plate is used for carrying out heat exchange on the heat-conducting medium and the electric core of the heated battery.

2. The system of claim 1, further comprising a power device that provides power to the system, the power device comprising a smart management system and a lithium titanate battery.

3. The system of claim 2, wherein the intelligent management system is configured to start the lithium titanate battery to provide power to the system when the cell temperature of the heated battery reaches a preset range until the cell temperature of the heated battery reaches a normal operating temperature.

4. The system of claim 1, wherein the system is powered by an external power source.

5. The system of claim 3, further comprising a refrigeration device coupled between the heating tank and the battery pack cold plate, the refrigeration device configured to refrigerate the heat transfer medium.

6. The system of claim 5, wherein the preset range is [ - ∞, -20 ℃ ] or [30 ℃, + ∞ ].

7. The system as set forth in claim 6, wherein said heating tank is operated and said refrigerating means is not operated when a preset range is [ - ∞, -20 ℃ ], and said refrigerating means is operated and said heating tank is not operated when said preset range is [30 ℃, + ∞ ].

8. The system of claim 1, wherein the system further comprises: the auxiliary circulation loop, and the ball valve and the ion exchanger which are sequentially connected to the auxiliary circulation loop;

one end of the auxiliary circulation loop is connected between the water pump and the heating tank, and the other end of the auxiliary circulation loop is connected between the water storage tank and the battery pack cold plate.

9. The system of claim 8, wherein the ion exchanger is configured to adsorb metal ions in the secondary circulation loop.

10. The system of claim 1, wherein a filtering device for filtering impurities in the heat transfer medium is connected between the water pump and the heating tank.

11. The system of claim 5, wherein the refrigeration device comprises a compressor for elevating low pressure gas to high pressure gas and a heat exchanger for exchanging heat and cold between the high pressure gas and the heat transfer medium.

12. The system of claim 10, wherein a bypass pipe is connected to a connection point between the water pump and the heating tank and a connection point between the water storage tank and the battery pack cold plate, and a ball valve is arranged on the bypass pipe.

13. A control method of a mobile energy storage emergency support power supply low-temperature starting system according to any one of claims 1 to 12, wherein the method comprises the following steps:

monitoring the cell temperature of the heated battery;

and when the cell temperature of the heated battery reaches a preset range, supplying electric energy to the system through the power supply device until the cell temperature of the heated battery reaches the normal operation temperature.

Technical Field

The invention relates to the field of battery protection, in particular to a mobile energy storage emergency guarantee power supply low-temperature starting system and a control method thereof.

Background

Large competition venues, media centers and the like in the winter Olympic Games have high requirements on power supply reliability, and emergency guarantee power supplies must be configured, wherein the on-snow project venues also require the emergency guarantee power supplies to be capable of resisting high and cold and adapting to complex terrains. The mobile emergency guarantee power supply widely used at present is a diesel generating car, and has the defects of no-load operation for a long time, no uninterrupted power supply, high noise, waste gas pollution, primary energy consumption and the like, and cannot meet the concept of green and zero-carbon winter and Australia proposed by Olympic Commission.

In recent years, with the continuous reduction of the cost of the electrochemical energy storage technology, more and more mobile energy storage systems are connected to a power grid for demonstration operation, and the future large-scale application is a necessary trend, but the starting and safe operation of the conventional electrochemical energy storage battery in the alpine region needs to be solved urgently. When the lithium iron phosphate battery is in a low-temperature environment, compared with the normal temperature, the battery has the phenomena of discharge capacity attenuation, discharge voltage reduction, cycle rate performance reduction, electrode lithium precipitation and the like. The capacity of the common lithium iron phosphate battery at-40 ℃ is only about 20% of the capacity of the room temperature, and the lithium iron phosphate battery can not be started at low temperature. The low-temperature performance of the lithium iron phosphate battery seriously restricts the popularization and application of the mobile energy storage guarantee power supply in cold areas.

Disclosure of Invention

The invention is provided to overcome the defects and provide a mobile energy storage emergency guarantee power supply low-temperature starting system and a control method thereof.

In a first aspect, a mobile energy storage emergency guarantee power low-temperature starting system is provided, which comprises: the system comprises a water storage tank, a water pump and a heating tank which are sequentially connected to a main circulation loop, wherein two ports of the main circulation loop are connected to a battery pack cold plate;

the water pump is used for providing circulating power for the heat-conducting medium in the main circulating loop;

the water storage tank is used for storing a heat-conducting medium;

the heating tank is used for heating the heat-conducting medium;

the battery pack cold plate is used for carrying out heat exchange on the heat-conducting medium and the electric core of the heated battery.

Preferably, the system further comprises a power supply device for supplying electric energy to the system, and the power supply device comprises an intelligent management system and a lithium titanate battery.

Further, the intelligent management system is used for starting the lithium titanate battery to provide electric energy for the system when the temperature of the battery core of the heated battery reaches a preset range until the temperature of the battery core of the heated battery reaches a normal operation temperature.

Preferably, the system provides power through an external power supply.

Furthermore, the system also comprises a refrigerating device connected between the heating tank and the cold plate of the battery pack, wherein the refrigerating device is used for refrigerating the heat-conducting medium.

Further, the preset range is [ - ∞, -20 ℃ ] or [30 ℃, +∞ ].

Further, when the preset range is [ - ∞, -20 ℃ ], the heating tank is operated and the refrigerating device is not operated, and when the preset range is [30 ℃, + ∞ ], the refrigerating device is operated and the heating tank is not operated.

Preferably, the system further comprises: the auxiliary circulation loop, and the ball valve and the ion exchanger which are sequentially connected to the auxiliary circulation loop;

one end of the auxiliary circulation loop is connected between the water pump and the heating tank, and the other end of the auxiliary circulation loop is connected between the water storage tank and the battery pack cold plate.

Further, the ion exchanger is used for adsorbing metal ions in the secondary circulation loop.

Preferably, a filter device for filtering impurities in the heat-conducting medium is connected between the water pump and the heating tank.

Further, the refrigerating apparatus includes a compressor for elevating a low pressure gas into a high pressure gas and a heat exchanger for exchanging heat and cold between the high pressure gas and a heat transfer medium.

Furthermore, a bypass pipeline is connected between a connecting point between the water pump and the heating tank and a connecting point between the water storage tank and the battery pack cold plate, and a ball valve is arranged on the bypass pipeline.

In a second aspect, a control method based on the mobile energy storage emergency guarantee power supply low-temperature starting system is provided, and the control method comprises the following steps:

monitoring the cell temperature of the heated battery;

and when the cell temperature of the heated battery reaches a preset range, supplying electric energy to the system through the power supply device until the cell temperature of the heated battery reaches the normal operation temperature.

One or more technical schemes of the invention at least have one or more of the following beneficial effects:

the invention provides a mobile energy storage emergency guarantee power supply low-temperature starting system and a control method thereof, wherein the mobile energy storage emergency guarantee power supply low-temperature starting system comprises the following steps: the system comprises a power supply device, a water storage tank, a water pump and a heating tank which are sequentially connected to a main circulation loop, wherein two ports of the main circulation loop are connected to a battery pack cold plate; the water pump is used for providing circulating power for the heat-conducting medium in the main circulating loop; the water storage tank is used for storing a heat-conducting medium; the heating tank is used for heating the heat-conducting medium; the battery pack cold plate is used for carrying out heat exchange on the heat-conducting medium and the electric core of the heated battery; and the power supply device is used for supplying electric energy to the system. This scheme has realized that portable energy storage battery starts the operation at the low temperature under cold environment through two kinds of battery cooperations, is applicable to the interior frame layout of container, and the electric quantity of power output battery is not lost.

Drawings

Fig. 1 is a schematic structural diagram of a conventional low-temperature starting system of a lithium battery in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a mobile energy storage emergency support power supply low-temperature starting system according to an embodiment of the invention;

fig. 3 is a flowchart of a control strategy of the mobile energy storage emergency support power supply low-temperature starting system according to the embodiment of the invention.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

When the battery is in a low-temperature environment, compared with the normal temperature, the battery has the phenomena of discharge capacity attenuation, discharge voltage reduction, cycle rate performance reduction, electrode lithium precipitation and the like.

The problem is solved in the conventional low-temperature starting method of the power supply at present, for example, patent ZL201811150462.6, "a low-temperature starting system and low-temperature starting method of a lithium battery", proposes a low-temperature starting system of a lithium battery, as shown in fig. 1, for providing heat for the lithium battery; comprises a water electrolysis device, a hydrogen storage tank, an oxygen storage tank, a catalytic combustion device and a heat exchange device; the water electrolysis device comprises an anode area and a cathode area, the anode area is connected with the oxygen storage tank, the cathode area is connected with the hydrogen storage tank, the oxygen storage tank and the hydrogen storage tank are both connected with the catalytic combustion device, and the catalytic combustion device is connected with the heat exchange device through a heat conduction medium. The patent also provides an electric automobile loaded with the lithium battery low-temperature starting system and a lithium battery low-temperature starting method. The low-temperature starting system of the lithium battery, which is provided by the patent, can realize ultralow-temperature starting and can be started at the temperature of minus 100 ℃; the energy of the lithium battery can not be additionally lost, and the braking energy can be recycled and applied to the water electrolysis hydrogen production. The method is mainly applied to starting of the electric automobile with the lithium iron battery, and has a high recovery speed compared with a conventional heating method.

The low-temperature starting of the lithium battery for the electric automobile can be realized, but the low-temperature starting of the lithium iron phosphate battery applied to the mobile energy storage emergency guarantee power supply cannot be expanded. Moreover, the hydrogen storage tank and the oxygen storage tank which need to be added in the patent increase potential safety hazard factors for the mobile energy storage vehicle.

In order to overcome the defects of the prior art, the invention provides a mobile energy storage emergency guarantee power supply low-temperature starting system, as shown in fig. 2, the mobile energy storage emergency guarantee power supply low-temperature starting system in the embodiment of the invention comprises:

the system comprises a power supply device, a water storage tank, a water pump and a heating tank which are sequentially connected to a main circulation loop, wherein two ports of the main circulation loop are connected to a battery pack cold plate;

the water pump is used for providing circulating power for the heat-conducting medium in the main circulating loop;

the water storage tank is used for storing a heat-conducting medium;

the heating tank is used for heating the heat-conducting medium;

the battery pack cold plate is used for carrying out heat exchange on the heat-conducting medium and the electric core of the heated battery;

and the power supply device is used for supplying electric energy to the system.

In one embodiment, the power supply device may be replaced with an external power supply.

In this embodiment, the main circulation loop may be a flexible pipe made of teflon;

specifically, the power supply device comprises an intelligent management system and a lithium titanate battery.

The intelligent management system is used for starting the lithium titanate battery to provide electric energy for the system when the temperature of the battery cell of the heated battery reaches a preset range until the temperature of the battery cell of the heated battery reaches a normal operation temperature.

In this embodiment, the system further includes a refrigeration device connected between the heating tank and the battery pack cold plate, where the refrigeration device is configured to refrigerate the heat transfer medium.

In this embodiment, the predetermined range is [ - ∞, -20 ℃ ] or [30 ℃, +∞ ].

In one embodiment, the preset range is [ - ∞, -20 ℃ ] when the battery pack is heated in winter, the heating tank is operated, the refrigeration unit is not operated, and when the battery pack is cooled in summer, the preset range is [30 ℃, + ∞ ], the refrigeration unit is operated, and the heating tank is not operated.

The refrigeration device comprises a compressor for lifting low-pressure gas into high-pressure gas and a heat exchanger for exchanging cold and heat between the high-pressure gas and a heat-conducting medium;

the working principle of the mobile energy storage emergency guarantee power supply low-temperature starting system is as follows: the main circulation loop transmits heat from the heating tank to the cold plate of the battery pack through the main circulation loop, and the heat is transmitted to the battery cell core through the cold plate of the battery pack, so that proper ambient temperature is provided for the battery pack, and the normal operation of the battery pack at the optimal ambient temperature is ensured.

In order to avoid scale deposit in the water pipe, the ethylene glycol water solution in the system needs to be softened, so that the auxiliary circulation loop is connected in parallel with the main circulation loop. A part of heating medium with preset flow constantly flows through the ion exchanger, ions possibly separated out in the pipeline are continuously purified, and then the heating medium in the main circulation loop is converged in front of the main water pump.

In this embodiment, the system further includes: the auxiliary circulation loop, and the ball valve and the ion exchanger which are sequentially connected to the auxiliary circulation loop;

one end of the auxiliary circulation loop is connected between the water pump and the heating tank, and the other end of the auxiliary circulation loop is connected between the water storage tank and the battery pack cold plate.

Further, the ion exchanger is used for adsorbing metal ions in the secondary circulation loop.

Preferably, a filter device for filtering impurities in the heat-conducting medium is connected between the water pump and the heating tank.

In one embodiment, the invention further provides a control strategy for the mobile energy storage emergency guarantee power supply low-temperature starting system, which comprises the following steps:

in order to realize the low-temperature starting operation of the lithium iron phosphate battery under the severe cold environment (-40 ℃) of the science and technology winter and Australia project, the lithium titanate battery is used as a low-temperature starting power supply of heating equipment, and the two-stage starting is carried out under the severe cold environment. Under the low temperature condition (-40 ℃), whether the system starts is judged by the intelligent management system, the lithium titanate battery is started at first, the lithium iron phosphate battery is lifted to a normal-temperature working interval within a certain time, the lithium iron phosphate battery is started, and the mobile energy storage emergency guarantee power supply is in standby operation and has full-power output capacity. Based on the environmental temperature information, the cell temperature, the heating time and the starting temperature adjustment, the optimal capacity configuration requirement of the lithium titanate battery capable of realizing the starting of the energy storage system and the heat preservation operation can be obtained through the analysis of an Ansys ICEPAK thermal simulation system.

The control strategy of the emergency guarantee power supply in the alpine environment shown in fig. 3 can be adopted in the system, the temperature can be accurately controlled, the heating power can be automatically adjusted according to actual conditions, and the power consumption is reduced. The method comprises the steps that starting conditions are judged by an intelligent management and control system, when a power supply system needs to be started to guarantee power supply, whether the lithium iron phosphate battery is in a standby state or not is judged, whether the lithium titanate battery needs to be started or not is judged according to environment temperature information, and therefore power is supplied to a heating system, and a lithium iron phosphate battery cell is preheated. And calculating heating power according to the ambient temperature, the cell temperature, the preheating time setting information and the preheating target temperature. And when the temperature of the electrode lug of the battery cell reaches a set value of-10 ℃, stopping heating, and then judging whether to start to ensure power supply.

Furthermore, in order to prevent water in the pipeline from flowing out completely when the main water pump or the water storage tank is maintained, the mobile energy storage emergency support power supply low-temperature starting system provided by the invention is characterized in that a bypass pipeline is connected between a connecting point between the water pump and the heating tank and a connecting point between the water storage tank and a battery pack cold plate, and a ball valve is arranged on the bypass pipeline.

Based on the same inventive concept, the invention also provides a control method based on the mobile energy storage emergency guarantee power supply low-temperature starting system, and the control method comprises the following steps:

monitoring the cell temperature of the heated battery;

and when the cell temperature of the heated battery reaches a preset range, supplying electric energy to the system through the power supply device until the cell temperature of the heated battery reaches the normal operation temperature.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.