Dual-air-cooling energy storage cell temperature control system and method

Abstract

The invention relates to the technical field of energy storage, in particular to a dual-air-cooling energy storage battery cell temperature control system and method, and the system comprises an energy storage container body, an air conditioner group disposed at the top of the inner side of the energy storage container body, and a control host installed on the outer wall of the energy storage container body. The two fans of the fan system are arranged at an air inlet and an air outlet of the outer wall of the energy storage container body, and an air outlet of the air conditioner is arranged downwards; the control host is connected with the temperature sensor and is used for detecting the external environment temperature of the energy storage container; the control host is connected with the BMS upper computer, and the BMS upper computer is connected with the battery cell and the battery pack. The air conditioner and the fan can be standby for each other, so that the air cooling failure rate and the probability of thermal runaway of the battery cell caused by damage of the air conditioner or the fan in a single air conditioner cooling system or fan cooling system are reduced, and the running stability of the energy storage container is improved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a dual air-cooled energy storage battery core temperature control system and method. Background Art

[0002] Under the background of "dual carbon", new energy is developing rapidly. With the growth of power market demand and the upgrading of energy structure, the demand for electrochemical energy storage container equipment with integrated lithium iron phosphate batteries has maintained a rapid growth trend. In recent years, as an innovative energy storage solution, energy storage containers have many characteristics such as high energy density, long service life, high degree of integration, simple installation and lifting, green environmental protection and easy maintenance. They have broad application prospects and market potential in many fields such as energy supply, grid stability, microgrids, and emergency backup power supplies. The temperature of energy storage containers has become a key factor affecting the capacity and life of energy storage products. A lot of heat will be generated during the charging and discharging process of the battery pack. If there is no reasonable cooling system in the closed container, it may cause equipment failure, even device scrapping and fire. And the battery pack can maximize the charging and discharging efficiency, reduce heat generation, and increase battery life within a specific temperature range. Therefore, air-cooled energy storage cell temperature control devices designed specifically for energy storage equipment came into being.

[0003] In view of the above problems, we propose a dual air-cooled energy storage battery temperature control system and method. Summary of the invention

[0004] The object of the present invention is to provide a dual air-cooled energy storage battery core temperature control system and method to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A dual air-cooled energy storage battery temperature control system, comprising:

[0007] An energy storage container, an air conditioning unit arranged on the top of the inner side of the energy storage container, a control host installed on the outer wall of the energy storage container, and two fans of the fan system arranged at the air inlet and air outlet of the outer wall of the energy storage container, and the air outlet of the air conditioner is arranged downward;

[0008] The control host is connected to a temperature sensor for detecting the external ambient temperature of the energy storage container;

[0009] The control host is connected to a BMS host computer, and the BMS host computer is connected to a battery cell and a battery pack.

[0010] Preferably, the air conditioning group includes five air conditioners 2, namely, the air conditioner 1, the air conditioner 2, the air conditioner 3, the air conditioner 4, and the air conditioner 5;

[0011] The L end, N row end, and PE row end of the control host are connected to the L end, N end, and PE end of the air conditioner 1, the air conditioner 2, the air conditioner 3, the air conditioner 4, and the air conditioner 5 in a one-to-one correspondence.

[0012] Preferably, the control host exchanges signals with the A end and the B end of the air conditioner 1, the air conditioner 2, the air conditioner 3, the air conditioner 4, and the air conditioner 5 respectively through the 484A end and the 485B end.

[0013] Preferably, the air conditioner 5 is connected to the metal film resistor.

[0014] A control method for a temperature control system of a double air-cooled energy storage battery cell includes the following three control modes:

[0015] The first control method: when the battery pack is in working state, the temperature of the air-cooled energy storage cell is controlled;

[0016] Second control mode: When the battery pack is not working, the air-cooled energy storage cell temperature control mode;

[0017] The third control mode: heating mode.

[0018] Preferably, when the battery pack is in working state, the air-cooled energy storage cell temperature control method specifically includes the following steps:

[0019] When the battery pack is in operation, the temperature sensor detects the battery cell temperature and the external ambient temperature and feeds them back to the control host. The control host controls the fan and the air conditioner according to the current battery cell temperature and the external ambient temperature, and determines the cooling and heating mode. The cooling mode is divided into fan cooling mode and air conditioning cooling mode.

[0020] When the maximum temperature of the battery cell is greater than or equal to the battery cell cooling start temperature, a cooling demand is issued and the following conditions are met:

[0021] A. The ambient temperature is at least 15°C lower than the battery core temperature;

[0022] B. The external environment temperature is less than or equal to 15℃;

[0023] When both conditions A and B are met, the system enters fan cooling mode, only turns on the fan to cool the battery pack, and adjusts the fan speed in real time according to the battery cell temperature. Otherwise, the system enters air conditioning cooling mode, only turns on the air conditioner to cool the battery pack, and adjusts the air conditioner output power in real time according to the battery cell temperature.

[0024] When the maximum temperature of the battery cell is less than or equal to the battery cell cooling start temperature, if the current mode is air conditioning cooling mode, the air conditioner exits the cooling state and turns on the fan. If the current mode is fan cooling mode, the fan runs at the minimum speed.

[0025] Preferably, when the battery pack is not in operation, the air-cooled energy storage cell temperature control method specifically includes the following steps:

[0026] When the maximum cell temperature is greater than or equal to the cell cooling start temperature plus the cell cooling temperature tolerance, a cooling demand is issued and the following conditions are met:

[0027] A. The ambient temperature is at least 15°C lower than the battery core temperature;

[0028] B. The external environment temperature is less than or equal to 15℃;

[0029] When both conditions A and B are met, the system enters the fan cooling mode and only turns on the fan to cool the battery pack. Otherwise, the system enters the air conditioning cooling mode and only turns on the air conditioning to cool the battery pack.

[0030] When the maximum temperature of the battery cell is less than or equal to the battery cell cooling start temperature, if the current mode is air conditioning cooling mode, the air conditioner exits the cooling state and turns on the fan for ventilation only. If the current mode is fan cooling mode, the fan runs at the minimum speed.

[0031] Preferably, in the heating mode, the following steps are specifically included:

[0032] When the minimum temperature of the battery cell is less than or equal to the starting temperature of the battery cell heating, the air conditioner enters the heating state, the fan does not work, and the air conditioner output power is adjusted in real time according to the battery cell temperature to heat the battery pack;

[0033] When the battery cell temperature is greater than or equal to the battery cell heating start temperature, the air conditioner is turned off and no longer heats the battery pack.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The temperature control of the present invention is more precise, and the working efficiency and life of the batteries in the energy storage container can be improved to a certain extent.

[0036] The present invention effectively reduces air cooling energy consumption and achieves energy saving.

[0037] The air conditioner and fan of the present invention can serve as backup for each other, thereby reducing the failure rate of air cooling, and the probability of thermal runaway of the battery cell caused by damage to the air conditioner or fan in a single air conditioning cooling system or fan cooling system, thereby improving the operating stability of the energy storage container. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the refrigeration control structure provided by the present invention is shown;

[0039] Figure 2 A schematic diagram of the heating control structure provided by the present invention is shown;

[0040] Figure 3 The schematic diagram of the structure of the air-cooled energy storage battery temperature control device provided by the present invention is shown;

[0041] Figure 4 The electrical schematic diagram of the air-cooled energy storage cell temperature control device provided by the present invention is shown.

[0042] In the figure: 1. Fan system; 2. Air conditioning; 3. Control host; 4. Temperature sensor. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Embodiment 1:

[0045] See also Figure 1-4 , a dual air-cooled energy storage battery temperature control system, comprising:

[0046] An energy storage container, an air conditioning unit arranged at the top of the inner side of the energy storage container, a control host 3 installed on the outer wall of the energy storage container, and fans of two fan systems 1 arranged at the air inlet and air outlet of the outer wall of the energy storage container, and the air outlet of the air conditioner 2 is arranged downward;

[0047] The control host 3 is connected to the temperature sensor 4 for detecting the external ambient temperature of the energy storage container;

[0048] The control host 3 is connected to the BMS host computer, and the BMS host computer is connected to the battery cell and the battery pack;

[0049] The air conditioning group includes five air conditioners 2, namely air conditioning 1, air conditioning 2, air conditioning 3, air conditioning 4, and air conditioning 5, and air conditioning 5 is connected to a metal film resistor;

[0050] The L end, N row end, and PE row end of the control host 3 are connected to the L end, N end, and PE end of air conditioner 1, air conditioner 2, air conditioner 3, air conditioner 4, and air conditioner 5 in a one-to-one correspondence;

[0051] The control host 3 exchanges signals with the A end and the B end of air conditioner 1, air conditioner 2, air conditioner 3, air conditioner 4, and air conditioner 5 through the 484A end and the 485B end respectively.

[0052] Based on the above embodiments, further:

[0053] The temperature sensor 4 detects the battery cell temperature of the battery pack and the external ambient temperature and feeds back to the control host 3. The control host 3 controls the fan and the air conditioner 2 according to the current battery cell temperature and the external ambient temperature, and determines the cooling and heating mode. The cooling mode is divided into a fan cooling mode and an air conditioning cooling mode.

[0054] Embodiment 2:

[0055] On the basis of Example 1, three control modes are further included, namely, when the battery pack is in working state, the air-cooled energy storage cell temperature control mode, when the battery pack is not in working state, the air-cooled energy storage cell temperature control mode, and the heating mode.

[0056] Embodiment 3:

[0057] On the basis of Example 2, when the battery pack is in working state, the air-cooled energy storage cell temperature control method specifically includes the following steps:

[0058] When the battery pack is working (charging or discharging), the cooling and heating mode is determined by monitoring the battery cell temperature and the external ambient temperature. The cooling mode is divided into fan cooling mode and air conditioning cooling mode;

[0059] When the maximum temperature of the battery cell is greater than or equal to the battery cell cooling start temperature, a cooling demand is issued and the following conditions are met:

[0060] A. The ambient temperature is at least 15°C lower than the battery core temperature;

[0061] B. The external environment temperature is less than or equal to 15℃;

[0062] When both conditions A and B are met, the system enters fan cooling mode, only turns on the fan to cool the battery pack, and adjusts the fan speed in real time according to the battery cell temperature. Otherwise, the system enters air conditioning cooling mode, only turns on the air conditioner to cool the battery pack, and adjusts the air conditioner output power in real time according to the battery cell temperature.

[0063] When the maximum temperature of the battery cell is less than or equal to the cooling temperature of the battery cell, if the current state is in air conditioning cooling mode, the air conditioner will exit the cooling state and turn on the fan (running at the minimum speed); if the current state is in fan cooling mode, the fan will run at the minimum speed;

[0064] like Figure 1 In the figure, Tmax indicates the maximum temperature of the battery cell, Tc indicates the temperature at which the battery cell starts to cool, and Tw indicates the external ambient temperature.

[0065] Embodiment 4:

[0066] On the basis of Example 2, when the battery pack is not in operation, the air-cooled energy storage cell temperature control method specifically includes the following steps:

[0067] When the maximum cell temperature is greater than or equal to the cell cooling start temperature plus the cell cooling temperature tolerance, a cooling demand is issued and the following conditions are met:

[0068] A. The ambient temperature is at least 15°C lower than the battery core temperature;

[0069] B. The external environment temperature is less than or equal to 15℃;

[0070] When both conditions A and B are met, the system enters the fan cooling mode and only turns on the fan to cool the battery pack. Otherwise, the system enters the air conditioning cooling mode and only turns on the air conditioning to cool the battery pack.

[0071] like Figure 1 In, Td represents the refrigeration temperature tolerance;

[0072] When the maximum temperature of the battery cell is less than or equal to the battery cell cooling start temperature, if the current mode is air conditioning cooling mode, the air conditioner exits the cooling state and turns on the fan (running at the minimum speed) for ventilation only. If the current mode is fan cooling mode, the fan runs at the minimum speed.

[0073] Embodiment 5:

[0074] Based on Example 2, in the heating mode, the following steps are specifically included:

[0075] When the minimum temperature of the battery cell is less than or equal to the starting temperature of the battery cell heating, the air conditioner enters the heating state, the fan does not work, and the air conditioner output power is adjusted in real time according to the battery cell temperature to heat the battery pack;

[0076] When the battery cell temperature is greater than or equal to the battery cell heating start temperature, the air conditioner is turned off and no longer heats the battery pack;

[0077] like Figure 2 In the figure, Tmin indicates the minimum temperature of the battery cell, Th indicates the temperature at which the battery cell starts heating, and Tw indicates the external ambient temperature obtained by the temperature sensor.

[0078] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dual air-cooled energy storage battery temperature control system, characterized in that: include: An energy storage container, an air conditioning unit arranged at the top of the inner side of the energy storage container, a control host (3) installed on the outer wall of the energy storage container, and two fans of the fan system (1) arranged at the air inlet and the air outlet of the outer wall of the energy storage container, and the air outlet of the air conditioner (2) is arranged downward; The control host (3) is connected to a temperature sensor (4) for detecting the external ambient temperature of the energy storage container; The control host (3) is connected to a BMS host computer, and the BMS host computer is connected to the battery cells and the battery pack.

2. A dual air-cooled energy storage battery temperature control system according to claim 1, characterized in that: The air conditioning group includes five air conditioners (2), namely, the air conditioner 1, the air conditioner 2, the air conditioner 3, the air conditioner 4, and the air conditioner 5; The L end, N row end, and PE row end of the control host (3) are connected to the L end, N end, and PE end of the air conditioner 1, the air conditioner 2, the air conditioner 3, the air conditioner 4, and the air conditioner 5 in a one-to-one correspondence.

3. A dual air-cooled energy storage core temperature control system and method according to claim 1, characterized in that: The control host (3) exchanges signals with the A end and the B end of the air conditioner 1, the air conditioner 2, the air conditioner 3, the air conditioner 4 and the air conditioner 5 respectively through the 484A end and the 485B end.

4. A dual air-cooled energy storage core temperature control system and method according to claim 1, characterized in that: The air conditioner 5 is connected to the metal film resistor.

5. A control method for a dual air-cooled energy storage core temperature control system according to any one of claims 1 to 4, characterized in that: There are three control modes: The first control method: when the battery pack is in working state, the temperature of the air-cooled energy storage cell is controlled; Second control mode: When the battery pack is not working, the air-cooled energy storage cell temperature control mode; The third control mode: heating mode.

6. The control method of a dual air-cooled energy storage core temperature control system according to claim 5, characterized in that: When the battery pack is in working state, the air-cooled energy storage cell temperature control method specifically includes the following steps: When the battery pack is in operation, the temperature sensor (4) detects the battery cell temperature of the battery pack and the external environment temperature, and feeds back to the control host (3). The control host (3) controls the fan and the air conditioner (2) according to the current battery cell temperature and the external environment temperature, and determines the cooling and heating mode. The cooling mode is divided into a fan cooling mode and an air conditioning cooling mode. When the maximum temperature of the battery cell is greater than or equal to the battery cell cooling start temperature, a cooling demand is issued and the following conditions are met: A. The ambient temperature is at least 15°C lower than the battery core temperature; B. The external environment temperature is less than or equal to 15℃; When both conditions A and B are met, the system enters fan cooling mode, only turns on the fan to cool the battery pack, and adjusts the fan speed in real time according to the battery cell temperature. Otherwise, the system enters air conditioning cooling mode, only turns on the air conditioner to cool the battery pack, and adjusts the air conditioner output power in real time according to the battery cell temperature. When the maximum temperature of the battery cell is less than or equal to the battery cell cooling start temperature, if the current mode is air conditioning cooling mode, the air conditioner exits the cooling state and turns on the fan. If the current mode is fan cooling mode, the fan runs at the minimum speed.

7. The control method of a dual air-cooled energy storage core temperature control system according to claim 5, characterized in that: When the battery pack is not in operation, the air-cooled energy storage cell temperature control method specifically includes the following steps: When the maximum cell temperature is greater than or equal to the cell cooling start temperature plus the cell cooling temperature tolerance, a cooling demand is issued and the following conditions are met: A. The ambient temperature is at least 15°C lower than the battery core temperature; B. The external environment temperature is less than or equal to 15℃; When both conditions A and B are met, the system enters the fan cooling mode and only turns on the fan to cool the battery pack. Otherwise, the system enters the air conditioning cooling mode and only turns on the air conditioning to cool the battery pack. When the maximum temperature of the battery cell is less than or equal to the battery cell cooling start temperature, if the current mode is air conditioning cooling mode, the air conditioner exits the cooling state and turns on the fan for ventilation only. If the current mode is fan cooling mode, the fan runs at the minimum speed.

8. The control method of a dual air-cooled energy storage core temperature control system according to claim 5, characterized in that: In heating mode, the specific steps include: When the minimum temperature of the battery cell is less than or equal to the starting temperature of the battery cell heating, the air conditioner enters the heating state, the fan does not work, and the air conditioner output power is adjusted in real time according to the battery cell temperature to heat the battery pack; When the battery cell temperature is greater than or equal to the battery cell heating start temperature, the air conditioner is turned off and no longer heats the battery pack.

Images