Temperature control method, device, electronic device and medium for energy storage battery system

Abstract

The present invention discloses a temperature control method, device, electronic device and medium for an energy storage battery system, which relates to the field of liquid cooling and includes the following steps: obtaining the real-time temperature of a battery in a liquid cooling cabinet; when the real-time temperature of the battery is greater than a first temperature threshold value A, switching the energy storage battery system to a first operating mode; when the real-time temperature of the battery is less than or equal to the first temperature threshold value A, and greater than or equal to a second temperature threshold value B, switching the energy storage battery system to a second operating mode, in which a natural cold source is used for cooling; when the real-time temperature of the battery is less than the second temperature threshold value B, switching the energy storage battery system to a third operating mode, in which the device providing the heat source is a liquid cooling unit. The present invention can achieve precise control, rapid response, and reduce the risk of battery temperature exceeding the standard.

Description

Technical Field

[0001] The present invention relates to the field of liquid cooling technology, and in particular to a temperature control method, device, electronic equipment and medium for an energy storage battery system. Background Art

[0002] The battery capacity of the energy storage power station is large, and the number of batteries is also large. At the same time, the maximum discharge rate of the power station as a power buffer is 1C. Therefore, the battery temperature and the temperature difference of each battery in the energy storage power station are relatively high. Once the battery temperature is too high or the local temperature difference is large, it is very easy to cause thermal runaway of the battery. Once out of control, the personal safety and economic losses will be extremely great.

[0003] The existing energy storage liquid cooling unit control often achieves heating and cooling through battery temperature range control. The temperature fluctuates greatly during the control process and the response is not timely, resulting in excessive temperature and slow cooling rate, which brings some risks. When the battery temperature drops and needs to be heated, the compressor frequency or water heating is not turned on in time, resulting in slow battery preheating. Therefore, the control technology of the energy storage liquid cooling unit in conjunction with the battery thermal management is poor and cannot meet and adapt to the changes in thermal load during battery charging and discharging. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to a certain extent. To this end, the present invention provides a temperature control method, device, electronic device and medium for an energy storage battery system.

[0005] In order to achieve the above object, a first aspect of the present invention provides a temperature control method for an energy storage battery system, comprising the following steps:

[0006] Get the real-time temperature of the battery in the liquid cooling cabinet;

[0007] When the real-time temperature of the battery is greater than a first temperature threshold value A, the energy storage battery system is switched to a first operation mode, wherein in the first operation mode, the device providing the cold source is a dry cooler;

[0008] When the real-time temperature of the battery is less than or equal to the first temperature threshold A and greater than or equal to the second temperature threshold B, the energy storage battery system is switched to a second operation mode, in which a natural cold source is used for cooling; wherein the first temperature threshold A is greater than the second temperature threshold B;

[0009] When the real-time temperature of the battery is less than the second temperature threshold B, the energy storage battery system is switched to a third operation mode, in which the device providing the heat source is a liquid cooling unit.

[0010] Optionally, when the real-time temperature of the battery is greater than a first temperature threshold A, the energy storage battery system is switched to a first operating mode, wherein in the first operating mode, the device providing a cold source is a dry cooler, comprising:

[0011] When the real-time temperature of the battery is greater than a first temperature threshold value A, controlling the dry cooler to operate;

[0012] The fan speed of the dry cooler is set. The calculation formula of the fan speed is as follows:

[0013] N(x)=K1×T d 2 +K2×T h +K3 (1)

[0014] In formula (1), T d is the real-time temperature of the battery, T h is the ambient temperature of the liquid cooling cabinet, K1 represents the first coefficient, the value range of K1 is 0.1-0.2, K2 represents the second coefficient, the value range of K2 is 0.4-0.6, K3 represents the third coefficient, the value range of K3 is 0.2-2.

[0015] Optionally, when the real-time temperature of the battery is greater than a first temperature threshold A, the energy storage battery system is switched to a first operation mode, wherein in the first operation mode, after the device providing a cold source is a dry cooler, the method further includes:

[0016] When the real-time temperature of the battery is greater than the third temperature threshold C, the energy storage battery system is switched to a fourth operating mode, wherein, in the fourth operating mode, the device providing the cold source is a liquid cooling unit; wherein the third temperature threshold C is greater than the first temperature threshold A.

[0017] Optionally, when the real-time temperature of the battery is greater than a third temperature threshold C, the energy storage battery system is switched to a fourth operation mode, wherein in the fourth operation mode, the device providing a cold source is a liquid cooling unit, including:

[0018] In response to the operation of the dry cooler, the battery temperature is compared with the third temperature threshold C, and when the real-time temperature of the battery is greater than the third temperature threshold C, the dry cooler is controlled to be turned off and the liquid cooling unit is controlled to be refrigerated;

[0019] After the cooling time of the liquid cooling unit is greater than a pre-stored first time length, acquiring temperature data of each battery cell in the battery to form a temperature data sequence;

[0020] Traversing the temperature data sequence, selecting the highest temperature value and the lowest temperature value in the temperature sequence, and calculating the maximum temperature difference between the cells in the battery;

[0021] Comparing the maximum temperature difference between the cells in the battery with a pre-stored fourth temperature threshold value X1, and when the maximum temperature difference between the cells in the battery is greater than the fourth temperature threshold value X1, controlling the liquid cooling unit to increase the cooling capacity;

[0022] The real-time temperature of the battery is compared with the battery temperature threshold T0, and the first set temperature of the liquid cooling unit is controlled according to the difference between the real-time temperature of the battery and the battery temperature threshold T0, and the ambient temperature of the liquid cooling unit is obtained. The calculation formula of the first set temperature is as follows:

[0023] f(a)=K4×T d 2 +K5×T h +K6 (2)

[0024] In formula (2), T d is the real-time temperature of the battery, T h is the ambient temperature of the liquid cooling cabinet, K4 represents the fourth coefficient, the value range of K4 is 0.02-0.3, K5 represents the fourth coefficient, the value range of K5 is 0.4-0.6, K6 represents the sixth coefficient, the value range of K6 is 0.6-1.2.

[0025] Optionally, controlling the liquid cooling unit to improve refrigeration capacity includes:

[0026] Obtaining the liquid inlet temperature and the liquid outlet temperature of the liquid cooling cabinet;

[0027] Compare the difference between the liquid inlet temperature and the liquid outlet temperature with a pre-stored fifth temperature threshold value Y1;

[0028] When the difference between the liquid inlet temperature and the liquid outlet temperature is greater than the fifth temperature threshold value Y1, the liquid pump of the liquid cooling unit is controlled to increase the flow rate, and the flow rate is calculated as follows:

[0029]

[0030] In formula (3), t(Q) represents the flow rate of the liquid pump, M represents the preset value of the coolant flow rate change rate of the liquid pump, and T max It represents the maximum value of the real-time temperature of each cell in the battery, T min represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature;

[0031] When the difference between the liquid inlet temperature and the liquid outlet temperature is less than or equal to the fifth temperature threshold value Y1, the first set temperature of the liquid cooling unit is controlled to decrease, and the calculation formula of the decrease amount of the first set temperature of the liquid cooling unit is as follows:

[0032]

[0033] In formula (4), T max Indicates the maximum temperature of each cell in the battery, T min Indicates the minimum temperature of each cell in the battery.

[0034] Optionally, after comparing the real-time temperature of the battery with the battery temperature threshold T0 and controlling the first set temperature of the liquid cooling unit according to the difference between the real-time temperature of the battery and the battery temperature threshold T0, the method further includes:

[0035] When the real-time temperature of the battery reaches the battery temperature threshold T0, the first-order derivative of the real-time temperature of the battery is compared with the sixth temperature threshold M. The calculation formula of the first-order derivative of the real-time temperature of the battery is as follows:

[0036]

[0037] In formula (5), the T d2 Represents the real-time temperature of the battery at the initial moment, T d1 Indicates the real-time temperature of the battery after time t;

[0038] When the first-order derivative of the real-time temperature of the battery is greater than the battery temperature threshold T0, the first set temperature of the liquid cooling unit is controlled to rise, and the calculation formula of the rise amount of the first set temperature of the liquid cooling unit is as follows:

[0039]

[0040] f(T′) represents the rise of the first set temperature of the liquid cooling unit, N represents the preset value of the change rate of the temperature of the liquid cooling unit, T max It represents the maximum value of the real-time temperature between the cells in the battery, T min represents the minimum value of the real-time temperatures between the battery cells in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature.

[0041] Optionally, when the real-time temperature of the battery is less than or equal to the first temperature threshold A and greater than or equal to a second temperature threshold B, the energy storage battery system is switched to a second operating mode, in which a natural cold source is used for cooling; wherein the first temperature threshold A is greater than the second temperature threshold B, including:

[0042] When the real-time temperature of the battery is less than or equal to the first temperature threshold A and greater than or equal to the second temperature threshold B, controlling the compressor of the liquid cooling unit to stop working;

[0043] Acquiring temperature data of each battery cell in the battery to form a temperature data sequence;

[0044] Traversing the temperature data sequence, selecting the highest temperature value and the lowest temperature value in the temperature sequence, and calculating the maximum temperature difference between the cells in the battery;

[0045] Compare the maximum temperature difference between the cells in the battery with a pre-stored sixth temperature threshold value X2, and when the maximum temperature difference between the cells in the battery is greater than the sixth temperature threshold value X2, obtain the liquid inlet temperature and the liquid outlet temperature of the liquid cooling cabinet;

[0046] Comparing the difference between the liquid inlet temperature and the liquid outlet temperature with a seventh temperature threshold value Y2;

[0047] When the difference between the liquid inlet temperature and the liquid outlet temperature is greater than the seventh temperature threshold value Y2, the liquid pump of the liquid cooling unit is controlled to increase the flow rate, and the flow rate is calculated as follows:

[0048]

[0049] In formula (7), t(Q) represents the flow rate of the liquid pump, M represents the preset value of the coolant flow rate change rate of the liquid pump, and T max It represents the maximum value of the real-time temperature of each cell in the battery, T min It represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature.

[0050] Optionally, when the real-time temperature of the battery is less than the second temperature threshold B, the energy storage battery system is switched to a third operation mode, in which the device providing the heat source is a liquid cooling unit, including:

[0051] When the real-time temperature of the battery is less than the second temperature threshold B, controlling the liquid cooling unit to heat;

[0052] After the heating time of the liquid cooling unit is greater than a pre-stored second time period, acquiring temperature data of each battery cell in the battery to form a temperature data sequence;

[0053] Traversing the temperature data sequence, selecting the highest temperature value and the lowest temperature value in the temperature sequence, and calculating the maximum temperature difference between the cells in the battery;

[0054] comparing the maximum temperature difference between the cells in the battery with a pre-stored eighth temperature threshold value X3, and controlling the liquid cooling unit to increase the heating capacity when the maximum temperature difference is greater than the eighth temperature threshold value X3;

[0055] The real-time temperature of the battery is compared with a battery temperature threshold T0, and the second set temperature of the liquid cooling unit is controlled according to the difference between the real-time temperature of the battery and the battery temperature threshold T0.

[0056] Optionally, controlling the liquid cooling unit to generate heat includes:

[0057] Determine the second set temperature of the liquid cooling unit, the calculation formula of the second set temperature is as follows:

[0058] f(b)=K7×T d 2 +K8×T h +K9 (8)

[0059] In formula (7), T d is the real-time temperature of the battery, T h is the ambient temperature of the liquid cooling cabinet, K7 represents the seventh coefficient, the value range of K7 is 0.1-0.5, K8 represents the eighth coefficient, the value range of K8 is 0.5-4, K9 represents the ninth coefficient, the value range of K9 is 0.5-2.

[0060] Optionally, controlling the liquid cooling unit to improve heating capacity includes:

[0061] Obtaining the liquid inlet temperature and the liquid outlet temperature of the liquid cooling cabinet;

[0062] Comparing the difference between the liquid inlet temperature and the liquid outlet temperature with a ninth temperature threshold value Y3;

[0063] When the difference between the liquid inlet temperature and the liquid outlet temperature is greater than the ninth temperature threshold value Y3, the liquid pump of the liquid cooling unit is controlled to increase the flow rate, and the flow rate is calculated as follows:

[0064]

[0065] In formula (3), t(Q) represents the flow rate of the liquid pump, M represents the preset value of the coolant flow rate change rate of the liquid pump, and T max It represents the maximum value of the real-time temperature of each cell in the battery, T min represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature;

[0066] When the difference between the liquid inlet temperature and the liquid outlet temperature is less than or equal to the ninth temperature threshold value Y3, the second set temperature of the liquid cooling unit is controlled to decrease, and the calculation formula of the decrease amount of the second set temperature of the liquid cooling unit is as follows:

[0067]

[0068] In formula (4), T max It represents the maximum value of the real-time temperature of each cell in the battery, T min Indicates the minimum value of the real-time temperatures of each cell in the battery.

[0069] Optionally, the real-time temperature of the battery is compared with a second battery temperature threshold T c Compare the real-time temperature of the battery with the second battery temperature threshold T c The second set temperature of the liquid cooling unit is controlled by the difference of

[0070] When the real-time temperature of the battery reaches the second battery temperature threshold T c When the first-order derivative of the real-time temperature of the battery is compared with the pre-stored tenth temperature threshold N, the calculation formula of the first-order derivative of the real-time temperature of the battery is as follows:

[0071]

[0072] In formula (5), the T d2 Represents the real-time temperature of the battery at the initial moment, T d1 Indicates the real-time temperature of the battery after time t;

[0073] At the t(T d ) is greater than the second battery temperature threshold T c When the second set temperature of the liquid cooling unit is controlled to decrease, the calculation formula of the decrease amount of the second set temperature of the liquid cooling unit is as follows:

[0074]

[0075] N represents the preset value of the change rate of the temperature of the liquid cooling unit, T maxIt represents the maximum value of the real-time temperature of each cell in the battery, T min It represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature.

[0076] A second aspect of the present invention provides a control device for an energy storage battery system, the energy storage battery system comprising a liquid cooling unit, a liquid pump, and a battery arranged in a liquid cooling cabinet, characterized in that the control device comprises: a detection module for obtaining the real-time temperature of each battery in the liquid cooling cabinet and the ambient temperature of the liquid cooling cabinet;

[0077] A first control module, used for switching the operation mode of the energy storage battery system according to the real-time temperature of the battery, a first temperature threshold A, and a second temperature threshold B;

[0078] The second control module is used to control the set temperature and liquid pump flow of the liquid cooling unit according to the real-time temperature of each battery cell in the battery and a preset threshold.

[0079] A third aspect of the present invention provides an electronic device, comprising:

[0080] one or more processors;

[0081] A memory having one or more computer programs stored thereon, when the one or more computer programs are executed by the one or more processors, the one or more processors implement the control method provided by the first aspect of the present invention.

[0082] According to a fourth aspect of the present invention, the computer program, when executed by a processor, implements the control method provided by the first aspect of the present invention.

[0083] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. The best embodiments or means of the present invention will be described in detail in conjunction with the drawings, but they are not intended to limit the technical solutions of the present invention. In addition, there are multiple features, elements, and components that appear in each of the following texts and drawings, and different symbols or numbers are marked for convenience, but they all represent components with the same or similar structures or functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] The present invention will be further described below in conjunction with the accompanying drawings:

[0085] Figure 1 Flow chart of the method of the present invention.

[0086] Figure 2 It is a schematic diagram of the structure of the system of the present invention.

[0087] Figure 3 It is a schematic diagram of the structure of the electronic device of the present invention.

[0088] Figure 4 It is a schematic diagram of the structure of the computer readable medium of the present invention.

[0089] Among them, 1. the first electric regulating valve; 2. the second electric regulating valve; 3. the third electric regulating valve; 4. the fourth electric regulating valve; 5. the dry cooler; 6. the cold plate in the liquid cooling mechanism; 7. the water side heat exchanger; 8. the air side heat exchanger; 9. the compressor, 101. the processor; 102. the memory; 103. the I / O interface; 104. the bus. DETAILED DESCRIPTION

[0090] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0091] References in this specification to "one embodiment" or "an example" or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment of the present patent disclosure. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0092] In the related technology, the compressor operating frequency of the energy storage chiller is not combined with the ambient temperature and battery temperature, and the compressor frequency and the water pump frequency are adjusted in time for intelligent adjustment to meet the temperature requirements and temperature difference requirements of the battery. Only by combining the ambient temperature, battery temperature, and the set temperature of the liquid cooling unit can the battery heat load be intelligently judged, and then the compressor frequency can be adjusted to achieve precise control, rapid response, and reduce the risk of excessive battery temperature.

[0093] Secondly, when the ambient temperature is not high and the heat dissipation of the battery is not large, turning on the liquid cooling unit will cause high energy consumption. At this time, if it can be switched to a dry cooler, the energy consumption can be greatly reduced. In addition, for the adjustment of battery temperature difference, the existing technology only uses the water pump flow to adjust the temperature difference, but the adjustment of heat load is supported by two parts, one is the flow rate, and the other is the cooling capacity.

[0094] In view of this, please refer to the attached Figure 1 As a first aspect of the present invention, a temperature control method for an energy storage battery system is provided, comprising the following steps:

[0095] In step S110, the real-time temperature of the battery in the liquid cooling cabinet and the ambient temperature of the liquid cooling cabinet are obtained;

[0096] In step S120, when the real-time temperature of the battery is greater than a first temperature threshold A, the energy storage battery system is switched to a first operation mode, wherein in the first operation mode, the device providing the cold source is a dry cooler;

[0097] In step S130, when the real-time temperature of the battery is less than or equal to the first temperature threshold A and greater than or equal to the second temperature threshold B, the energy storage battery system is switched to a second operation mode, in which a natural cold source is used for cooling; wherein the first temperature threshold A is greater than the second temperature threshold B;

[0098] In step S140, when the real-time temperature of the battery is less than the second temperature threshold B, the energy storage battery system is switched to a third operation mode, in which the device providing the heat source is a liquid cooling unit.

[0099] The range of A is 25-35°C, and the value of this embodiment is 28°C; the range of B is 5-20°C, and the value of this patent is 15°C; the range of C is 30-35°C, and the value of this embodiment is 31°C.

[0100] In step S120, when the real-time temperature of the battery is greater than a first temperature threshold A, the energy storage battery system is switched to a first operation mode, wherein in the first operation mode, the device providing a cold source is a dry cooler, including:

[0101] When the real-time temperature of the battery is greater than the first temperature threshold A, the dry cooler is controlled to operate; the ambient temperature of the liquid cooling cabinet is obtained, the third electric regulating valve 3 and the fourth electric regulating valve 4 are opened, the first electric regulating valve 1 and the second electric regulating valve 2 are closed, and the liquid cooling unit is not started. At the same time, the dry cooler fan is turned on;

[0102] The fan speed of the dry cooler is set, and the initial fan speed is set to 50%. The calculation formula of the fan speed is as follows:

[0103] N(x)=K1×T d 2 +K2×T h +K3 (1)

[0104] In formula (1), T d is the real-time temperature of the battery, T h is the ambient temperature of the liquid cooling cabinet, K1 represents the first coefficient, the value range of K1 is 0.1-0.2, K2 represents the second coefficient, the value range of K2 is 0.4-0.6, K3 represents the third coefficient, the value range of K3 is 0.2-2.

[0105] After step S120, the method further includes:

[0106] Step S121, when the real-time temperature of the battery is greater than a third temperature threshold C, switching the energy storage battery system to a fourth operation mode, wherein in the fourth operation mode, the device providing the cold source is a liquid cooling unit; wherein the third temperature threshold C is greater than the first temperature threshold A, specifically includes:

[0107] In response to the operation of the dry cooler, the battery temperature is compared with the third temperature threshold C, and when the real-time temperature of the battery is greater than the third temperature threshold C, the dry cooler is controlled to be turned off and the liquid cooling unit is controlled to be refrigerated;

[0108] After the cooling time of the liquid cooling unit is greater than a pre-stored first time length, acquiring temperature data of each battery cell in the battery to form a temperature data sequence;

[0109] Traversing the temperature data sequence, selecting the highest temperature value and the lowest temperature value in the temperature sequence, and calculating the maximum temperature difference between the cells in the battery;

[0110] The maximum temperature difference between the cells in the battery is compared with the pre-stored fourth temperature threshold value X1. When the maximum temperature difference between the cells in the battery is greater than the fourth temperature threshold value X1, the liquid cooling unit is controlled to improve the cooling capacity; X1 takes a value of 2-6°C, and in this embodiment takes a value of 4°C. 6. If the battery temperature difference is greater than 4°C, the coolant flow rate needs to be increased to reduce the temperature difference; if it is less than 4°C, no processing is required, and the battery temperature and battery temperature difference continue to be detected;

[0111] The real-time temperature of the battery is compared with the battery temperature threshold T0, and the first set temperature of the liquid cooling unit is controlled according to the difference between the real-time temperature of the battery and the battery temperature threshold T0, and the ambient temperature of the liquid cooling unit is obtained. The calculation formula of the first set temperature is as follows:

[0112] f(a)=K4×T d 2 +K5×T h +K6 (2)

[0113] In formula (2), T d is the real-time temperature of the battery, T h is the ambient temperature of the liquid cooling cabinet, K4 represents the fourth coefficient, the value range of K4 is 0.02-0.3, K5 represents the fourth coefficient, the value range of K5 is 0.4-0.6, K6 represents the sixth coefficient, the value range of K6 is 0.6-1.2.

[0114] Specifically, controlling the liquid cooling unit to improve the refrigeration capacity includes:

[0115] Obtaining the liquid inlet temperature and the liquid outlet temperature of the liquid cooling cabinet;

[0116] Compare the difference between the inlet temperature and the outlet temperature with a pre-stored fifth temperature threshold value Y1; Y1 ranges from 3°C to 6°C, and in this embodiment, the value is 3°C;

[0117] When the difference between the liquid inlet temperature and the liquid outlet temperature is greater than the fifth temperature threshold value Y1, the liquid pump of the liquid cooling unit is controlled to increase the flow rate, and the flow rate is calculated as follows:

[0118]

[0119] In formula (3), t(Q) represents the flow rate of the liquid pump, M represents the preset value of the coolant flow rate change rate of the liquid pump, and T max It represents the maximum value of the real-time temperature of each cell in the battery, T min represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature;

[0120] When the difference between the liquid inlet temperature and the liquid outlet temperature is less than or equal to the fifth temperature threshold value Y1, the first set temperature of the liquid cooling unit is controlled to decrease, and the calculation formula of the decrease amount of the first set temperature of the liquid cooling unit is as follows:

[0121]

[0122] In formula (4), T max Indicates the maximum temperature of each cell in the battery, T min Indicates the minimum value of the temperature of each cell in the battery. Continue to detect the battery temperature and the cell temperature difference;

[0123] After comparing the real-time temperature of the battery with the battery temperature threshold T0 and controlling the first set temperature of the liquid cooling unit according to the difference between the real-time temperature of the battery and the battery temperature threshold T0, the method further includes:

[0124] When the real-time temperature of the battery reaches the battery temperature threshold T0, the first-order derivative of the real-time temperature of the battery is compared with the sixth temperature threshold M. The calculation formula of the first-order derivative of the real-time temperature of the battery is as follows:

[0125]

[0126] In formula (5), the T d2Represents the real-time temperature of the battery at the initial moment, T d1 Indicates the real-time temperature of the battery after time t;

[0127] When the first-order derivative of the real-time temperature of the battery is greater than the battery temperature threshold T0, the first set temperature of the liquid cooling unit is controlled to rise, and the calculation formula of the rise amount of the first set temperature of the liquid cooling unit is as follows:

[0128]

[0129] f(T′) represents the rise of the first set temperature of the liquid cooling unit, N represents the preset value of the change rate of the temperature of the liquid cooling unit, T max It represents the maximum value of the real-time temperature between the cells in the battery, T min represents the minimum value of the real-time temperatures between the battery cells in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature.

[0130] In step S130, when the real-time temperature of the battery is less than or equal to the first temperature threshold A and greater than or equal to the second temperature threshold B, the energy storage battery system is switched to a second operation mode, in which a natural cold source is used for cooling; wherein the first temperature threshold A is greater than the second temperature threshold B, including:

[0131] When the real-time temperature of the battery is less than or equal to the first temperature threshold A and greater than or equal to the second temperature threshold B, controlling the compressor of the liquid cooling unit to stop working;

[0132] Acquiring temperature data of each battery cell in the battery to form a temperature data sequence;

[0133] Traversing the temperature data sequence, selecting the highest temperature value and the lowest temperature value in the temperature sequence, and calculating the maximum temperature difference between the cells in the battery;

[0134] Compare the maximum temperature difference between the cells in the battery with a pre-stored sixth temperature threshold value X2, and when the maximum temperature difference between the cells in the battery is greater than the sixth temperature threshold value X2, obtain the liquid inlet temperature and the liquid outlet temperature of the liquid cooling cabinet;

[0135] Comparing the difference between the liquid inlet temperature and the liquid outlet temperature with a seventh temperature threshold value Y2;

[0136] When the difference between the liquid inlet temperature and the liquid outlet temperature is greater than the seventh temperature threshold value Y2, the liquid pump of the liquid cooling unit is controlled to increase the flow rate, and the flow rate is calculated as follows:

[0137]

[0138] In formula (7), t(Q) represents the flow rate of the liquid pump, M represents the preset value of the coolant flow rate change rate of the liquid pump, and T max It represents the maximum value of the real-time temperature of each cell in the battery, T min It represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature.

[0139] When the real-time temperature of the battery is less than the second temperature threshold B, the energy storage battery system is switched to a third operation mode, in which the device providing the heat source is a liquid cooling unit, including:

[0140] When the real-time temperature of the battery is less than the second temperature threshold B, controlling the liquid cooling unit to heat;

[0141] After the heating time of the liquid cooling unit is greater than the pre-stored second time length, the second time length is 3 minutes, and the temperature data of each battery cell in the battery is obtained to form a temperature data sequence;

[0142] Traversing the temperature data sequence, selecting the highest temperature value and the lowest temperature value in the temperature sequence, and calculating the maximum temperature difference between the cells in the battery;

[0143] comparing the maximum temperature difference between the cells in the battery with a pre-stored eighth temperature threshold value X3, and controlling the liquid cooling unit to increase the heating capacity when the maximum temperature difference is greater than the eighth temperature threshold value X3;

[0144] The real-time temperature of the battery is compared with a battery temperature threshold T0, and the second set temperature of the liquid cooling unit is controlled according to the difference between the real-time temperature of the battery and the battery temperature threshold T0.

[0145] The step of controlling the liquid cooling unit to generate heat comprises:

[0146] Determine the second set temperature of the liquid cooling unit. The default initial set return water temperature is 35°C. The calculation formula of the second set temperature is as follows:

[0147] f(b)=K7×T d 2 +K8×T h +K9 (8)

[0148] In formula (7), T d is the real-time temperature of the battery, T his the ambient temperature of the liquid cooling cabinet, K7 represents the seventh coefficient, the value range of K7 is 0.1-0.5, K8 represents the eighth coefficient, the value range of K8 is 0.5-4, K9 represents the ninth coefficient, the value range of K9 is 0.5-2.

[0149] Specifically, controlling the liquid cooling unit to improve the heating capacity includes:

[0150] Obtaining the liquid inlet temperature and the liquid outlet temperature of the liquid cooling cabinet;

[0151] Comparing the difference between the liquid inlet temperature and the liquid outlet temperature with a ninth temperature threshold value Y3;

[0152] When the difference between the liquid inlet temperature and the liquid outlet temperature is greater than the ninth temperature threshold value Y3, the liquid pump of the liquid cooling unit is controlled to increase the flow rate, and the flow rate is calculated as follows:

[0153]

[0154] In formula (3), t(Q) represents the flow rate of the liquid pump, M represents the preset value of the coolant flow rate change rate of the liquid pump, and T max It represents the maximum value of the real-time temperature of each cell in the battery, T min represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature;

[0155] When the difference between the liquid inlet temperature and the liquid outlet temperature is less than or equal to the ninth temperature threshold value Y3, the second set temperature of the liquid cooling unit is controlled to decrease, and the calculation formula of the decrease amount of the second set temperature of the liquid cooling unit is as follows:

[0156]

[0157] In formula (4), T max It represents the maximum value of the real-time temperature of each cell in the battery, T min Indicates the minimum value of the real-time temperatures of each cell in the battery.

[0158] The real-time temperature of the battery is compared with the second battery temperature threshold T c Compare the real-time temperature of the battery with the second battery temperature threshold T c The second set temperature of the liquid cooling unit is controlled by the difference of

[0159] When the real-time temperature of the battery reaches the second battery temperature threshold T cWhen the first-order derivative of the real-time temperature of the battery is compared with the pre-stored tenth temperature threshold N, the calculation formula of the first-order derivative of the real-time temperature of the battery is as follows:

[0160]

[0161] In formula (5), the T d2 Represents the real-time temperature of the battery at the initial moment, T d1 Indicates the real-time temperature of the battery after time t;

[0162] At the t(T d ) is greater than the second battery temperature threshold T c When the second set temperature of the liquid cooling unit is controlled to decrease, the calculation formula of the decrease amount of the second set temperature of the liquid cooling unit is as follows:

[0163]

[0164] N represents the preset value of the change rate of the temperature of the liquid cooling unit, T max It represents the maximum value of the real-time temperature of each cell in the battery, T min It represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature.

[0165] A second aspect of the present invention provides a control device for an energy storage battery system, Figure 2 The energy storage battery system includes a dry cooler, a liquid cooling unit, a liquid pump, and a battery arranged in a liquid cooling cabinet. A cold plate is arranged in the liquid cooling cabinet, and the cold plate is respectively connected to the dry cooler and the liquid cooling unit. The control device includes: a detection module, which is used to obtain the real-time temperature of each battery in the liquid cooling cabinet and the ambient temperature of the liquid cooling cabinet;

[0166] A first control module, used for switching the operation mode of the energy storage battery system according to the real-time temperature of the battery, a first temperature threshold A, and a second temperature threshold B;

[0167] The second control module is used to control the set temperature and liquid pump flow of the liquid cooling unit according to the real-time temperature of each battery cell in the battery and a preset threshold.

[0168] A third aspect of the present invention provides an electronic device, comprising:

[0169] One or more processors 101;

[0170] The memory 102 stores one or more computer programs. When the one or more computer programs are executed by the one or more processors 101, the one or more processors 101 implement the control method according to the first aspect of the present invention.

[0171] The electronic device may further include one or more I / O interfaces 103 connected between the processor 101 and the memory 102 and configured to implement information interaction between the processor 101 and the memory 102 .

[0172] Among them, the processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH); the I / O interface 103 (read-write interface) is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus), etc.

[0173] In some embodiments, the processor 101 , the memory 102 , and the I / O interface 103 are connected to each other via a bus 104 , and further connected to other components of the computing device.

[0174] A fourth aspect of the present invention provides a computer-readable medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the control method according to any one of claims 1 to 11.

[0175] It will be understood by those skilled in the art that all or part of the processes in the above-mentioned embodiments can be implemented by

[0176] The method can be completed by instructing the relevant hardware through a computer program. Accordingly, the computer program can be stored in a non-volatile computer-readable storage medium, and the computer program can implement the method of any of the above embodiments when executed. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM) and memory bus dynamic RAM (RDRAM).

[0177] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A temperature control method for an energy storage battery system, characterized in that: The following steps are involved: Get the real-time temperature of the battery in the liquid cooling cabinet; When the real-time temperature of the battery is greater than a first temperature threshold value A, the energy storage battery system is switched to a first operation mode, wherein in the first operation mode, the device providing the cold source is a dry cooler; When the real-time temperature of the battery is less than or equal to the first temperature threshold A and greater than or equal to the second temperature threshold B, the energy storage battery system is switched to a second operation mode, in which a natural cold source is used for cooling; wherein the first temperature threshold A is greater than the second temperature threshold B; When the real-time temperature of the battery is less than the second temperature threshold B, the energy storage battery system is switched to a third operation mode, in which the device providing the heat source is a liquid cooling unit.

2. The temperature control method of the energy storage battery system according to claim 1, characterized in that: When the real-time temperature of the battery is greater than a first temperature threshold value A, the energy storage battery system is switched to a first operation mode, wherein in the first operation mode, the device providing a cold source is a dry cooler, comprising: When the real-time temperature of the battery is greater than a first temperature threshold value A, controlling the dry cooler to operate; The fan speed of the dry cooler is set. The calculation formula of the fan speed is as follows: N(x)=K1×T d 2 +K2×T h +K3 (1) In formula (1), T d is the real-time temperature of the battery, T h is the ambient temperature of the liquid cooling cabinet, K1 represents the first coefficient, the value range of K1 is 0.1-0.2, K2 represents the second coefficient, the value range of K2 is 0.4-0.6, K3 represents the third coefficient, the value range of K3 is 0.2-2.

3. The temperature control method of the energy storage battery system according to claim 1, characterized in that: When the real-time temperature of the battery is greater than a first temperature threshold value A, the energy storage battery system is switched to a first operation mode, wherein in the first operation mode, after the device providing a cold source is a dry cooler, the method further includes: When the real-time temperature of the battery is greater than the third temperature threshold C, the energy storage battery system is switched to a fourth operating mode, wherein, in the fourth operating mode, the device providing the cold source is a liquid cooling unit; wherein the third temperature threshold C is greater than the first temperature threshold A.

4. The temperature control method of the energy storage battery system according to claim 3, characterized in that: When the real-time temperature of the battery is greater than a third temperature threshold C, the energy storage battery system is switched to a fourth operation mode, wherein in the fourth operation mode, the device providing a cold source is a liquid cooling unit, including: In response to the operation of the dry cooler, the battery temperature is compared with the third temperature threshold C, and when the real-time temperature of the battery is greater than the third temperature threshold C, the dry cooler is controlled to be turned off and the liquid cooling unit is controlled to be refrigerated; After the cooling time of the liquid cooling unit is greater than a pre-stored first time length, acquiring temperature data of each battery cell in the battery to form a temperature data sequence; Traversing the temperature data sequence, selecting the highest temperature value and the lowest temperature value in the temperature sequence, and calculating the maximum temperature difference between the cells in the battery; Comparing the maximum temperature difference between the cells in the battery with a pre-stored fourth temperature threshold value X1, and when the maximum temperature difference between the cells in the battery is greater than the fourth temperature threshold value X1, controlling the liquid cooling unit to increase the cooling capacity; The real-time temperature of the battery is compared with the battery temperature threshold T0, and the first set temperature of the liquid cooling unit is controlled according to the difference between the real-time temperature of the battery and the battery temperature threshold T0, and the ambient temperature of the liquid cooling unit is obtained. The calculation formula of the first set temperature is as follows: f(a)=K4×T d 2 +K5×T h +K6 (2) In formula (2), T d is the real-time temperature of the battery, T h is the ambient temperature of the liquid cooling cabinet, K4 represents the fourth coefficient, the value range of K4 is 0.02-0.3, K5 represents the fourth coefficient, the value range of K5 is 0.4-0.6, K6 represents the sixth coefficient, the value range of K6 is 0.6-1.

2.

5. The temperature control method of the energy storage battery system according to claim 3, characterized in that: The controlling the liquid cooling unit to improve the refrigeration capacity includes: Obtaining the liquid inlet temperature and the liquid outlet temperature of the liquid cooling cabinet; Compare the difference between the liquid inlet temperature and the liquid outlet temperature with a pre-stored fifth temperature threshold value Y1; When the difference between the liquid inlet temperature and the liquid outlet temperature is greater than the fifth temperature threshold value Y1, the liquid pump of the liquid cooling unit is controlled to increase the flow rate, and the flow rate is calculated as follows: In formula (3), t(Q) represents the flow rate of the liquid pump, M represents the preset value of the coolant flow rate change rate of the liquid pump, and T max It represents the maximum value of the real-time temperature of each cell in the battery, T min represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature; When the difference between the liquid inlet temperature and the liquid outlet temperature is less than or equal to the fifth temperature threshold value Y1, the first set temperature of the liquid cooling unit is controlled to decrease, and the calculation formula of the decrease amount of the first set temperature of the liquid cooling unit is as follows: In formula (4), T max Indicates the maximum temperature of each cell in the battery, T min Indicates the minimum temperature of each cell in the battery.

6. The temperature control method of the energy storage battery system according to claim 4, characterized in that: After comparing the real-time temperature of the battery with the battery temperature threshold T0 and controlling the first set temperature of the liquid cooling unit according to the difference between the real-time temperature of the battery and the battery temperature threshold T0, the method further includes: When the real-time temperature of the battery reaches the battery temperature threshold T0, the first-order derivative of the real-time temperature of the battery is compared with the sixth temperature threshold M. The calculation formula of the first-order derivative of the real-time temperature of the battery is as follows: In formula (5), the T d2 Represents the real-time temperature of the battery at the initial moment, T d1 Indicates the real-time temperature of the battery after time t; When the first-order derivative of the real-time temperature of the battery is greater than the battery temperature threshold T0, the first set temperature of the liquid cooling unit is controlled to rise, and the calculation formula of the rise amount of the first set temperature of the liquid cooling unit is as follows: f(T′) represents the rise of the first set temperature of the liquid cooling unit, N represents the preset value of the change rate of the temperature of the liquid cooling unit, T max It represents the maximum value of the real-time temperature between the cells in the battery, T min represents the minimum value of the real-time temperatures between the battery cells in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature.

7. The temperature control method of the energy storage battery system according to claim 1, characterized in that: When the real-time temperature of the battery is less than or equal to the first temperature threshold A and greater than or equal to the second temperature threshold B, the energy storage battery system is switched to a second operation mode, in which a natural cold source is used for cooling; wherein the first temperature threshold A is greater than the second temperature threshold B, including: When the real-time temperature of the battery is less than or equal to the first temperature threshold A and greater than or equal to the second temperature threshold B, controlling the compressor of the liquid cooling unit to stop working; Acquiring temperature data of each battery cell in the battery to form a temperature data sequence; Traversing the temperature data sequence, selecting the highest temperature value and the lowest temperature value in the temperature sequence, and calculating the maximum temperature difference between the cells in the battery; Compare the maximum temperature difference between the cells in the battery with a pre-stored sixth temperature threshold value X2, and when the maximum temperature difference between the cells in the battery is greater than the sixth temperature threshold value X2, obtain the liquid inlet temperature and the liquid outlet temperature of the liquid cooling cabinet; Comparing the difference between the liquid inlet temperature and the liquid outlet temperature with a seventh temperature threshold value Y2; When the difference between the liquid inlet temperature and the liquid outlet temperature is greater than the seventh temperature threshold value Y2, the liquid pump of the liquid cooling unit is controlled to increase the flow rate, and the flow rate is calculated as follows: In formula (7), t(Q) represents the flow rate of the liquid pump, M represents the preset value of the coolant flow rate change rate of the liquid pump, and T max It represents the maximum value of the real-time temperature of each cell in the battery, T min It represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature.

8. The temperature control method of the energy storage battery system according to claim 1, characterized in that: When the real-time temperature of the battery is less than the second temperature threshold B, the energy storage battery system is switched to a third operation mode, in which the device providing the heat source is a liquid cooling unit, including: When the real-time temperature of the battery is less than the second temperature threshold B, controlling the liquid cooling unit to heat; After the heating time of the liquid cooling unit is greater than a pre-stored second time period, acquiring temperature data of each battery cell in the battery to form a temperature data sequence; Traversing the temperature data sequence, selecting the highest temperature value and the lowest temperature value in the temperature sequence, and calculating the maximum temperature difference between the cells in the battery; comparing the maximum temperature difference between the cells in the battery with a pre-stored eighth temperature threshold value X3, and controlling the liquid cooling unit to increase heating capacity when the maximum temperature difference is greater than the eighth temperature threshold value X3; The real-time temperature of the battery is compared with a battery temperature threshold T0, and the second set temperature of the liquid cooling unit is controlled according to the difference between the real-time temperature of the battery and the battery temperature threshold T0.

9. The temperature control method of the energy storage battery system according to claim 8, characterized in that: The step of controlling the liquid cooling unit to generate heat comprises: Determine the second set temperature of the liquid cooling unit, the calculation formula of the second set temperature is as follows: f(b)=K7×T d 2 +K8×T h +K9 (8) In formula (7), T d is the real-time temperature of the battery, T h is the ambient temperature of the liquid cooling cabinet, K7 represents the seventh coefficient, the value range of K7 is 0.1-0.5, K8 represents the eighth coefficient, the value range of K8 is 0.5-4, K9 represents the ninth coefficient, the value range of K9 is 0.5-2.

10. The temperature control method of the energy storage battery system according to claim 9, characterized in that: The controlling the liquid cooling unit to improve the heating capacity includes: Obtaining the liquid inlet temperature and the liquid outlet temperature of the liquid cooling cabinet; Comparing the difference between the liquid inlet temperature and the liquid outlet temperature with a ninth temperature threshold value Y3; When the difference between the liquid inlet temperature and the liquid outlet temperature is greater than the ninth temperature threshold value Y3, the liquid pump of the liquid cooling unit is controlled to increase the flow rate, and the flow rate is calculated as follows: In formula (3), t(Q) represents the flow rate of the liquid pump, M represents the preset value of the coolant flow rate change rate of the liquid pump, and T max It represents the maximum value of the real-time temperature of each cell in the battery, T min represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature; When the difference between the liquid inlet temperature and the liquid outlet temperature is less than or equal to the ninth temperature threshold value Y3, the second set temperature of the liquid cooling unit is controlled to decrease, and the calculation formula of the decrease amount of the second set temperature of the liquid cooling unit is as follows: In formula (4), T max It represents the maximum value of the real-time temperature of each cell in the battery, T min Indicates the minimum value of the real-time temperatures of each cell in the battery.

11. The temperature control method of the energy storage battery system according to claim 10, characterized in that: The real-time temperature of the battery is compared with the second battery temperature threshold T c Compare the real-time temperature of the battery with the second battery temperature threshold T c The second set temperature of the liquid cooling unit is controlled by the difference of When the real-time temperature of the battery reaches the second battery temperature threshold T c When the first-order derivative of the real-time temperature of the battery is compared with the pre-stored tenth temperature threshold N, the calculation formula of the first-order derivative of the real-time temperature of the battery is as follows: In formula (5), the T d2 Represents the real-time temperature of the battery at the initial moment, T d1 Indicates the real-time temperature of the battery after time t; At the t(T d ) is greater than the second battery temperature threshold T c When the second set temperature of the liquid cooling unit is controlled to decrease, the calculation formula of the decrease amount of the second set temperature of the liquid cooling unit is as follows: N represents the preset value of the change rate of the temperature of the liquid cooling unit, T max It represents the maximum value of the real-time temperature of each cell in the battery, T min It represents the minimum value of the real-time temperature of each battery cell in the battery; T2 represents the maximum value of the liquid inlet temperature and the liquid outlet temperature, and T1 represents the minimum value of the liquid inlet temperature and the liquid outlet temperature.

12. A control device for an energy storage battery system, the energy storage battery system comprising a liquid cooling unit, a liquid pump, and a battery arranged in a liquid cooling cabinet, characterized in that: The control device comprises: a detection module for acquiring the real-time temperature of each battery in the liquid cooling cabinet and the ambient temperature of the liquid cooling cabinet; A first control module, used for switching the operation mode of the energy storage battery system according to the real-time temperature of the battery, a first temperature threshold A, and a second temperature threshold B; The second control module is used to control the set temperature and liquid pump flow of the liquid cooling unit according to the real-time temperature of each battery cell in the battery and a preset threshold.

13. An electronic device, characterized in that: include: one or more processors; A memory having one or more computer programs stored thereon, wherein when the one or more computer programs are executed by the one or more processors, the one or more processors implement the control method according to any one of claims 1 to 11.

14. A computer readable medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method according to any one of claims 1 to 11 is implemented.

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