Electric loader battery thermal management control method, system, device and medium

Abstract

The present invention discloses a method, system, device and medium for controlling thermal management of a battery of an electric loader, comprising the following steps: if the loader is in a parked state, when the temperature of the power battery is less than or equal to T 01 ℃, heat the power battery to T1℃; if the loader is not in the parked state, when the power battery is in the charging state, further determine whether the temperature of the power battery is ≤T 02 ℃, when the temperature of the power battery ≤T 02 ℃, heat the power battery to T2℃; when the power battery is in working state, further judge whether the temperature of the power battery is ≤T 03 ℃, when the temperature of the power battery ≤T 03 ℃, heat the power battery to T3℃; when the power battery temperature > T 03 ℃, continue to judge the relationship between the temperature of the power battery and the temperature of the hydraulic oil. The present invention can automatically perform thermal management on the battery, implement different strategies according to different scenarios, heat the power battery to the target temperature, and avoid battery damage due to low temperature.

Description

Technical Field

[0001] The present invention relates to a method, system, equipment and medium for controlling thermal management of an electric loader battery, and belongs to the field of thermal management of loader batteries. Background Art

[0002] Electric loaders are greatly affected by temperature in extremely cold environments. The reliable operation of electric loaders is crucial to ensuring construction efficiency. If necessary maintenance and care are neglected during daily use, it will cause irreversible effects on the battery system, such as reducing battery life and affecting battery performance. Currently, lithium-ion batteries are greatly affected by temperature. In low-temperature environments, if the driver does not understand the precautions for the battery and does not heat the battery to a certain temperature, it may cause battery damage, battery charging, loader malfunction, or insufficient loader power. Therefore, the loader needs to be able to automatically manage the battery's thermal performance according to different working conditions to ensure that the power battery maintains the optimal temperature in cold working conditions, avoid battery damage due to excessively low temperatures, and avoid the driver's tedious manual adjustment of the battery temperature during use. Summary of the Invention

[0003] In response to the above problems in the prior art, the present invention provides a method, system, device and medium for thermal management control of an electric loader battery.

[0004] In order to achieve the above objectives, the present invention adopts an electric loader battery thermal management control method, comprising the following steps:

[0005] (1) If the loader is in a parked state, determine whether the temperature of the power battery is ≤T 01 ℃, when the temperature of the power battery ≤T 01 ℃, heat the power battery to T1℃;

[0006] (2) If the loader is not in a parked state, determine whether the power battery is in a charging state or a working state:

[0007] (201) When the power battery is in a charging state, further determine whether the temperature of the power battery is ≤T 02 ℃, when the temperature of the power battery ≤T 02 ℃, heat the power battery to T2℃;

[0008] (202) When the power battery is in working state, further determine whether the temperature of the power battery is ≤T 03 ℃, when the temperature of the power battery ≤T 03 ℃, heat the power battery to T3℃; when the power battery temperature > T 03 ℃, continue to judge the relationship between the power battery temperature and the hydraulic oil temperature:

[0009] When the power battery temperature is less than or equal to the hydraulic oil temperature, continue to judge whether the power battery temperature is <T 04 ℃, when the temperature of the power battery <T 04 ℃, the power battery is heated to T3, when the power battery temperature ≥ T 04 ℃, the power battery is cooled;

[0010] When the temperature of the power battery is greater than the temperature of the hydraulic oil, the power battery is cooled;

[0011] The power battery heating system has three heating modes: the first heating mode is to heat the battery through the heat generated by the battery itself during operation; the second heating mode is to heat the battery through the hydraulic oil circuit; and the third heating mode is to heat the battery through the PTC heater in the cooling water circuit.

[0012] The T 01 The lowest temperature at which the power battery will not be damaged when the loader is parked in a cold environment. 02 The lowest temperature at which the power battery can be charged is T 03 The T is the normal operating temperature of the power battery. 04 It is the optimal operating temperature of the power battery.

[0013] In some embodiments, the hydraulic oil circuit includes a hydraulic oil tank, a hydraulic pump, a hydraulic actuator, a third electromagnetic reversing valve, a fourth electromagnetic reversing valve, a second heating module, a third temperature sensor and a radiator;

[0014] The cooling water circuit includes a water tank, a water pump, a first electromagnetic reversing valve, a fifth electromagnetic reversing valve, a first heating module, a PTC heater, a second temperature sensor, a power battery, a first temperature sensor, a second electromagnetic reversing valve and a radiator;

[0015] There is a heat sink in the middle of the second heating module, and there is a box on each side of the heat sink. Hydraulic oil and cooling water flow through the boxes on both sides respectively. The heat of the hydraulic oil is transferred to the cooling water channel through the heat sink, and then the heat is transferred to the power battery; a PTC heater is installed in the box on one side of the first heating module, and the cooling water channel flows through the box on the other side. The heat of the PTC heater is transferred to the cooling water channel through the heat sink, and then the heat is transferred to the power battery.

[0016] In some embodiments, when the third heating mode is turned on, the amount of heat obtained by the power battery per unit time is:

[0017]

[0018] Where Q is the heat transferred per unit time, W; T a is the temperature of the PTC heater, K; T xis the current temperature of the power battery, K; δ is the thickness of the flat wall, m; λ is the thermal conductivity W / m·K; F is the area on both sides of the heat sink, m 2 ; α 11 is the convection heat transfer coefficient between cooling water and radiator, W / (m 2 K), α 12 is the convection heat transfer coefficient between cooling water and power battery, W / (m 2 K);

[0019] In the third heating mode, the temperature change T(t) of the power battery is:

[0020]

[0021] Among them, Q is the heat transferred per unit time, t is the heating time, m is the mass of the heated object, c is the specific heat capacity of the heated object, and T0 is the initial temperature of the power battery.

[0022] In some embodiments, when the second heating mode is turned on, the amount of heat obtained by the power battery per unit time is:

[0023]

[0024] Where Q is the heat transferred per unit time, W; T b is the temperature of the hydraulic oil, K; T x is the current temperature of the power battery, K; δ is the thickness of the flat wall, m; λ is the thermal conductivity W / m·K; F is the area on both sides of the heat sink, m 2 ; α 21 is the convection heat transfer coefficient between hydraulic oil and heat sink, W / (m 2 K); α 22 is the convection heat transfer coefficient between hydraulic oil and heat sink, W / (m 2 K); α 12 is the convection heat transfer coefficient between cooling water and power battery, W / (m 2 K);

[0025] In the second heating mode, the temperature of the power battery changes as follows:

[0026]

[0027] Among them, Q is the heat transferred per unit time, t is the heating time, m is the mass of the heated object, c is the specific heat capacity of the heated object, and T0 is the initial temperature of the power battery.

[0028] In some embodiments, the first temperature sensor is installed on the power battery to measure the temperature of the power battery; the second temperature sensor is installed on the first heating module on a side close to the PTC heater installation box to measure the temperature of the PTC heater; the third temperature sensor is installed on the second heating module on a side close to the hydraulic oil circuit box to measure the temperature of the hydraulic oil circuit.

[0029] In some embodiments, the first solenoid reversing valve is respectively connected to the water pump, the second heating module and the fifth solenoid reversing valve; the second solenoid reversing valve is respectively connected to the power battery, the radiator and the water tank; the third solenoid reversing valve is respectively connected to the hydraulic actuator, the second heating module and the fourth solenoid reversing valve; the fourth solenoid reversing valve is respectively connected to the third solenoid reversing valve, the hydraulic oil tank and the radiator; the fifth solenoid reversing valve is respectively connected to the first solenoid reversing valve, the second heating module, the first heating module and the power battery.

[0030] In some embodiments, the PTC heater, the first solenoid reversing valve, the second solenoid reversing valve, the third solenoid reversing valve, the fourth solenoid reversing valve, and the fifth solenoid reversing valve are all connected to the vehicle controller via a CAN bus and receive control signals sent by the vehicle controller;

[0031] The control panel, the first temperature sensor, the second temperature sensor, and the third temperature sensor are all connected to the vehicle controller via a CAN bus and send data to the vehicle controller.

[0032] A second aspect of the present invention provides an electric loader battery thermal management control system to implement the electric loader battery thermal management control method, comprising:

[0033] Power battery temperature judgment module, used to judge the temperature of the power battery;

[0034] The power battery heating module is used to heat the power battery according to the temperature of the power battery by selectively using the heat generated by the battery itself during operation, the hydraulic oil circuit or the cooling water circuit.

[0035] According to a third aspect of the present invention, there is provided an electronic device, comprising:

[0036] processor;

[0037] a memory, the memory being configured to store instructions executable by the processor;

[0038] The processor is used to run computer programs or instructions to implement the electric loader battery thermal management control method.

[0039] A fourth aspect of the present invention provides a computer-readable storage medium.

[0040] The computer-readable storage medium stores computer-executable instructions, which are used to implement the electric loader battery thermal management control method when executed by a processor.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] (1) Under cold working conditions, the temperature required for the power battery varies in different usage scenarios. Currently, the driver manually adjusts the battery temperature according to the external weather and the loader instructions, which is labor-intensive and prone to battery damage due to negligence. The present invention can automatically perform thermal management on the battery, implement different strategies according to different scenarios, heat the power battery to the target temperature, and avoid battery damage due to excessively low temperature.

[0043] (2) A three-speed heating mode is set up, which uses the heat generated by the PTC heater and the hydraulic oil during operation to heat the power battery. For the working conditions of the loader when it is parked, charging and working, these three heating modes can be used for heating, and the heat generated by the hydraulic oil can be reasonably used to heat the power battery, saving electricity.

[0044] (3) It basically meets all vehicle operating requirements in cold weather and has high versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 This is a schematic structural diagram of the battery thermal management control system for an electric loader according to the present invention;

[0047] Figure 2 Schematic diagram of data interaction of the present invention;

[0048] Figure 3 This is a schematic diagram of the control strategy of the electric loader battery thermal management control method of the present invention. DETAILED DESCRIPTION

[0049] In order to make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions of the present application are described in detail below with the help of drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0050] Example 1

[0051] like Figure 1 As shown, a battery thermal management control system for an electric loader includes a hydraulic oil circuit and a cooling water circuit;

[0052] The hydraulic oil circuit includes a hydraulic oil tank, a hydraulic pump, a hydraulic actuator, a third electromagnetic reversing valve, a fourth electromagnetic reversing valve, a second heating module, a third temperature sensor and a radiator;

[0053] The cooling water circuit includes a water tank, a water pump, a first electromagnetic reversing valve, a fifth electromagnetic reversing valve, a first heating module, a PTC heater, a second temperature sensor, a power battery, a first temperature sensor, a second electromagnetic reversing valve and a radiator;

[0054] The second heating module has a heat sink in the middle, with a box on each side of the heat sink. Hydraulic oil and cooling water flow through the boxes on both sides, respectively. The heat of the hydraulic oil is transferred to the cooling water channel via the heat sink, and then the heat is transferred to the power battery. A PTC heater is installed in the box on one side of the first heating module, and the cooling water channel flows through the box on the other side. The heat of the PTC heater is transferred to the cooling water channel via the heat sink, and then the heat is transferred to the power battery.

[0055] The heating of the power battery includes three heating modes: the first heating mode is to heat the battery through the heat generated by the battery itself when it is working, the second heating mode is to heat the battery through the hydraulic oil circuit, and the third heating mode is to heat the battery through the PTC heater in the cooling water circuit.

[0056] In some embodiments, the first temperature sensor is installed on the power battery to measure the temperature of the power battery at all times; the second temperature sensor is installed on the first heating module on a side close to the PTC heater installation box to measure the temperature of the PTC heater; the third temperature sensor is installed on the second heating module on a side close to the hydraulic oil circuit box to measure the temperature of the hydraulic oil circuit.

[0057] In some embodiments, the first solenoid reversing valve is respectively connected to the water pump, the second heating module and the fifth solenoid reversing valve; the second solenoid reversing valve is respectively connected to the power battery, the radiator and the water tank; the third solenoid reversing valve is respectively connected to the hydraulic actuator, the second heating module and the fourth solenoid reversing valve; the fourth solenoid reversing valve is respectively connected to the third solenoid reversing valve, the hydraulic oil tank and the radiator; the fifth solenoid reversing valve is respectively connected to the first solenoid reversing valve, the second heating module, the first heating module and the power battery.

[0058] In some embodiments, as Figure 2As shown, the PTC heater, the first solenoid reversing valve, the second solenoid reversing valve, the third solenoid reversing valve, the fourth solenoid reversing valve, and the fifth solenoid reversing valve are connected to the vehicle controller (VCU) through a CAN bus and receive control signals sent by the vehicle controller (VCU); the control panel, the first temperature sensor, the second temperature sensor, and the third temperature sensor are connected to the vehicle controller (VCU) through a CAN bus and send data to the vehicle controller (VCU).

[0059] The hydraulic actuators vary according to different machine models. This embodiment takes the boom cylinder, rocker cylinder and steering cylinder as examples.

[0060] The storage battery and the power battery adopt different strategies to provide energy for the electric loader according to the temperature of the battery.

[0061] In some embodiments, when the third heating mode is turned on, the amount of heat obtained by the power battery per unit time is:

[0062]

[0063] Where Q is the heat transferred per unit time, W; T a is the temperature of the PTC heater, K; T x is the current temperature of the power battery, K; δ is the thickness of the flat wall, m; λ is the thermal conductivity W / m·K; F is the area on both sides of the heat sink, m 2 ; α 11 is the convection heat transfer coefficient between cooling water and radiator, W / (m 2 K), α 12 is the convection heat transfer coefficient between cooling water and power battery, W / (m 2 K);

[0064] In the third heating mode, the temperature change T(t) of the power battery is:

[0065]

[0066] Among them, Q is the heat transferred per unit time, t is the heating time, m is the mass of the heated object, c is the specific heat capacity of the heated object, and T0 is the initial temperature of the power battery.

[0067] In some embodiments, when the second heating mode is turned on, the amount of heat obtained by the power battery per unit time is:

[0068]

[0069] Where Q is the heat transferred per unit time, W; T b is the temperature of the hydraulic oil, K; T xis the current temperature of the power battery, K; δ is the thickness of the flat wall, m; λ is the thermal conductivity W / m·K; F is the area on both sides of the heat sink, m 2 ; α 21 is the convection heat transfer coefficient between hydraulic oil and heat sink, W / (m 2 K); α 22 is the convection heat transfer coefficient between hydraulic oil and heat sink, W / (m 2 K); α 12 is the convection heat transfer coefficient between cooling water and power battery, W / (m 2 K);

[0070] In the second heating mode, the temperature of the power battery changes as follows:

[0071]

[0072] Among them, Q is the heat transferred per unit time, t is the heating time, m is the mass of the heated object, c is the specific heat capacity of the heated object, and T0 is the initial temperature of the power battery.

[0073] Example 2

[0074] like Figure 1 、 Figure 2 and Figure 3 As shown, a battery thermal management control method for an electric loader is based on the above-mentioned battery thermal management control system for an electric loader, comprising the following steps:

[0075] S1, the controller determines the current state of the loader. If the loader is in a parked state, go to S2; if the loader is not in a parked state, go to S4;

[0076] S2. Determine the temperature of the power battery at this time. If the battery temperature is ≤T 01 ℃ (at this temperature, the power battery will be damaged due to low temperature, so the battery needs to be heated), go to S3; if the battery temperature > T 01 ℃, then end this process (T 01 The lowest temperature at which the power battery will not be damaged when the loader is parked in a cold environment);

[0077] S3: The fifth solenoid reversing valve is switched to the left position, with ports 1 and 3 open and port 2 closed. The first solenoid reversing valve is switched to the right position, with ports 1 and 2 open and port 3 closed. The second solenoid reversing valve is switched to the left position, with ports 1 and 3 open and port 2 closed. The PTC heater is now heated to T1°C, and the cooling water does not flow through the second heating module and radiator (T1, T2, and T3 are automatically calculated by the system based on the heating time, current battery temperature, and heating strategy).

[0078] S4, judging whether the loader is in a charging state at this time, if the loader is in a charging state, go to S5; if the loader is not in a charging state, go to S8;

[0079] S5, the first electromagnetic reversing valve changes to the left position, the first and third ports are open, and the second port is closed; the fifth electromagnetic reversing valve changes to the left position, the first and third ports are open, and the second port is closed; the second electromagnetic reversing valve changes to the left position, the first and third ports are open, and the second port is closed (at this time, the cooling water does not flow through the radiator, and the cooling water does not need to dissipate heat at this time, because the temperature needs to be quickly heated to the set value and maintained at this temperature, T 01 The specific value varies depending on the battery model, outdoor environment, and battery cooling system. The specific temperature depends on the actual situation).

[0080] S6. Determine the temperature of the power battery at this time. If the power battery temperature is ≤T 02 ℃, go to S7, if the battery temperature > T 02 ℃, the battery can be charged normally at this time, the heat generated by the battery charging is used to heat the power battery, and this process ends (T 02 The lowest temperature at which the battery can be charged. The specific value varies depending on the battery model, outdoor environment, and battery cooling system. The specific temperature is determined according to actual conditions).

[0081] S7, turn on the PTC heater and heat it to T2℃. If the battery temperature is ≤T 02 ℃, re-monitor the temperature of the power battery. If the battery temperature is >T 02 ℃, the PTC heater stops heating, the power battery can be charged normally, and this process ends;

[0082] S8, the loader is in working state, and the power battery temperature is determined. If the power battery temperature is ≤T 03 ℃, go to S9; if the battery temperature > T 03 ℃, go to S10(T 03 This is the temperature at which the power battery can operate normally, which may vary depending on the operating conditions);

[0083] S9, the fourth solenoid reversing valve changes to the left position, ports 1 and 2 are open, port 3 is closed, and the PTC heater heats to T3°C (the hydraulic oil does not flow through the radiator at this time, and the hydraulic oil does not need to be dissipated at this time because the hydraulic oil temperature needs to be raised as quickly as possible to heat the power battery);

[0084] S10: Determine whether the power battery temperature is > T 03 ℃, if the battery temperature>T 03 ℃, go to S11; if the battery temperature ≤ T03 ℃, re-judge the battery temperature;

[0085] S11: The PTC heater stops heating and the relationship between the battery temperature and the hydraulic oil temperature is determined. If the power battery temperature is less than or equal to the hydraulic oil temperature, the process goes to S12; if the power battery temperature is greater than the hydraulic oil temperature, the process goes to S13.

[0086] S12, the third electromagnetic reversing valve changes to the left position, the first and second ports are opened, and the third port is closed; the first electromagnetic reversing valve changes to the right position, the first and second ports are opened, and the third port is closed; the fifth electromagnetic reversing valve changes to the left position, the first and second ports are opened, and the third port is closed, and then go to S14;

[0087] S13, the third solenoid reversing valve changes to the right position, ports 1 and 3 are open, and port 2 is closed; the fourth solenoid reversing valve changes to the right position, ports 1 and 3 are open, and port 2 is closed; the first solenoid reversing valve changes to the left position, ports 1 and 3 are open, and port 2 is closed (at this time, the hydraulic oil flows through the radiator and the hydraulic oil begins to dissipate heat);

[0088] S14, determine the temperature of the power battery at this time, if the battery temperature <T 04 ℃, go to S15; if the battery temperature ≥T 04 ℃, go to S16(T 04 The optimal operating temperature of the power battery, at which the battery performance and discharge capacity are at their best. The temperature varies for batteries made of different materials, and the specific value depends on the actual battery used).

[0089] S15, PTC heater is heated to T3℃, and then go to S14;

[0090] S16, the fifth electromagnetic reversing valve changes to the right position, the first and third ports are opened, and the second port is closed; the second electromagnetic reversing valve changes to the right position, the first and second ports are opened, and the third port is closed; the PTC heater stops heating, and this process ends (at this time, the cooling water flows through the radiator and the cooling water begins to dissipate heat).

[0091] Example 3

[0092] An electronic device, comprising:

[0093] processor;

[0094] a memory, the memory being configured to store instructions executable by the processor;

[0095] The processor is used to run computer programs or instructions to implement the electric loader battery thermal management control method.

[0096] In addition, the present invention also provides a computer-readable storage medium,

[0097] The computer-readable storage medium stores computer-executable instructions, which are used to implement the electric loader battery thermal management control method when executed by a processor.

[0098] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0099] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0100] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0101] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all protected by the present invention.

Claims

1. A method for controlling thermal management of a battery of an electric loader, characterized in that: The following steps are involved: (1) If the loader is in a parked state, determine whether the temperature of the power battery is ≤ T 01 ℃, when the temperature of the power battery ≤T 01 ℃, heat the power battery to T1℃; (2) If the loader is not in a parked state, determine whether the power battery is in a charging state or a working state: (201) When the power battery is in the charging state, it is further determined whether the temperature of the power battery is ≤ T 02 ℃, when the temperature of the power battery ≤ T 02 ℃, heat the power battery to T2℃; (202) When the power battery is in working state, further determine whether the temperature of the power battery is ≤ T 03 ℃, when the temperature of the power battery ≤ T 03 ℃, heat the power battery to T3℃; when the power battery temperature > T 03 ℃, continue to judge the relationship between the power battery temperature and the hydraulic oil temperature: When the power battery temperature ≤ hydraulic oil temperature, continue to determine whether the power battery temperature < T 04 ℃, when the temperature of the power battery < T 04 ℃, the power battery is heated to T3, when the power battery temperature ≥ T 04 ℃, the power battery is cooled; When the temperature of the power battery is greater than the temperature of the hydraulic oil, the power battery is cooled; The power battery heating system has three heating modes: the first heating mode is to heat the battery through the heat generated by the battery itself during operation; the second heating mode is to heat the battery through the hydraulic oil circuit; and the third heating mode is to heat the battery through the PTC heater in the cooling water circuit. The T 01 The lowest temperature at which the power battery will not be damaged when the loader is parked in a cold environment. 02 The lowest temperature at which the power battery can be charged is T 03 The T is the normal operating temperature of the power battery. 04 The optimal operating temperature for the power battery; The hydraulic oil circuit includes a hydraulic oil tank, a hydraulic pump, a hydraulic actuator, a third electromagnetic reversing valve, a fourth electromagnetic reversing valve, a second heating module, a third temperature sensor and a radiator; the cooling water circuit includes a water tank, a water pump, a first electromagnetic reversing valve, a fifth electromagnetic reversing valve, a first heating module, a PTC heater, a second temperature sensor, a power battery, a first temperature sensor, a second electromagnetic reversing valve and a radiator; a heat sink is provided in the middle of the second heating module, and a box is provided on each side of the heat sink. Hydraulic oil and cooling water flow through the boxes on both sides respectively, and the heat of the hydraulic oil is transferred to the cooling water circuit via the heat sink, and then the heat is transferred to the power battery; a PTC heater is installed in the box on one side of the first heating module, and the cooling water circuit flows through the box on the other side. The heat of the PTC heater is transferred to the cooling water circuit via the heat sink, and then the heat is transferred to the power battery; The first solenoid reversing valve is respectively connected to the water pump, the second heating module and the fifth solenoid reversing valve; the second solenoid reversing valve is respectively connected to the power battery, the radiator and the water tank; the third solenoid reversing valve is respectively connected to the hydraulic actuator, the second heating module and the fourth solenoid reversing valve; the fourth solenoid reversing valve is respectively connected to the third solenoid reversing valve, the hydraulic oil tank and the radiator; the fifth solenoid reversing valve is respectively connected to the first solenoid reversing valve, the second heating module, the first heating module and the power battery.

2. The electric loader battery thermal management control method according to claim 1, characterized in that: When the third level heating mode is turned on, the amount of heat gained by the power battery per unit time is: ； in, Q is the heat transferred per unit time, W; T a is the temperature of the PTC heater, K; T x is the current temperature of the power battery, K; is the thickness of the flat wall, m; is the thermal conductivity ; F is the area on both sides of the heat sink, m 2 ; is the convection heat transfer coefficient between cooling water and heat sink, , is the convection heat transfer coefficient between cooling water and power battery, ; In the third gear heating mode, the temperature change of the power battery for: ； in, Q is the heat transferred per unit time, t is the heating time, m is the mass of the heated object, c is the specific heat capacity of the heated object, T 0 is the initial temperature of the power battery.

3. The electric loader battery thermal management control method according to claim 1, characterized in that: When the second heating mode is turned on, the heat obtained by the power battery per unit time is: ； in, Q is the heat transferred per unit time, W; T b is the temperature of the hydraulic oil, K; T x is the current temperature of the power battery, K; is the thickness of the flat wall, m; is the thermal conductivity ; F is the area on both sides of the heat sink, m 2 ; is the convection heat transfer coefficient between the hydraulic oil and the heat sink, ; is the convection heat transfer coefficient between the hydraulic oil and the heat sink, ; is the convection heat transfer coefficient between cooling water and power battery, ; In the second heating mode, the temperature of the power battery changes as follows: ； in, Q is the heat transferred per unit time, t is the heating time, m is the mass of the heated object, c is the specific heat capacity of the heated object, T 0 is the initial temperature of the power battery.

4. The electric loader battery thermal management control method according to claim 1, characterized in that: The first temperature sensor is installed on the power battery to measure the temperature of the power battery; the second temperature sensor is installed on the side of the first heating module close to the PTC heater installation box to measure the temperature of the PTC heater; the third temperature sensor is installed on the side of the second heating module close to the hydraulic oil circuit box to measure the temperature of the hydraulic oil circuit.

5. The electric loader battery thermal management control method according to claim 1, characterized in that: The PTC heater, the first solenoid reversing valve, the second solenoid reversing valve, the third solenoid reversing valve, the fourth solenoid reversing valve and the fifth solenoid reversing valve are all connected to the vehicle controller via a CAN bus and receive control signals sent by the vehicle controller.

6. An electric loader battery thermal management control system, characterized in that: To implement the electric loader battery thermal management control method according to any one of claims 1 to 5, comprising: Power battery temperature judgment module, used to judge the temperature of the power battery; The power battery heating module is used to heat the power battery according to the temperature of the power battery by selectively using the heat generated by the battery itself during operation, the hydraulic oil circuit or the cooling water circuit.

7. An electronic device, characterized in that: include: processor; a memory, the memory being configured to store instructions executable by the processor; The processor is configured to run a computer program or instruction to implement the electric loader battery thermal management control method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the electric loader battery thermal management control method according to any one of claims 1 to 5.

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