Control system and method of power battery refrigeration working condition compressor

Abstract

The invention discloses a control system and method for a power battery refrigeration working condition compressor. The control method of the power battery refrigeration working condition compressor is applied to the control system of the power battery refrigeration working condition compressor. The control method of the power battery refrigeration working condition compressor comprises the steps that the inlet temperature and the outlet temperature of a water chilling unit are collected based on a first temperature detection device and a second temperature detection device; the controller determines a first set temperature deviation signal according to the inlet temperature and the outlet temperature, and determines a second set temperature deviation signal according to the outlet temperature and the target temperature of the water chilling unit; and the controller performs return difference group control on the first set temperature deviation signal, performs PID control on the second set temperature deviation signal and outputs a rotating speed signal of the compressor, and the compressor operates according to the rotating speed signal. The rotating speed of the compressor is controlled, and temperature fluctuation and frequent starting, stopping and fluctuation of the rotating speed of the compressor are reduced.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of power batteries, and in particular to a control system and method for a power battery refrigeration compressor. Background Art

[0002] In the control of variable frequency compressors for commercial vehicle power battery refrigeration, there are generally segmented control and PID control. PID control is not ideal because of the temperature acquisition accuracy and the need to adapt to different refrigeration needs and temperature targets, which makes the outlet temperature control unstable and the compressor speed fluctuates.

[0003] The segmented control sets the compressor speed target in segments by using the difference between different outlet temperatures and the set temperature. For example, when the difference is about 4°C, the compressor runs at full speed; when the difference is 2-4°C, the compressor runs at half speed; after the difference is lower than the set temperature, the compressor stops running. This control method will cause the compressor to start and stop frequently and the outlet temperature to fluctuate. Due to the unstable outlet temperature control, the frequent start-up of the compressor will also affect the life of the compressor. At the same time, the vibration of the compressor start and stop will affect the user experience. Summary of the invention

[0004] The present invention provides a control system and method for a compressor in a power battery refrigeration condition, which adopts a segmented hysteresis and an improved PID control method to control the speed of the compressor, thereby reducing temperature fluctuations and frequent starts and stops and fluctuations in the speed of the compressor.

[0005] According to one aspect of the present invention, a control method for a power battery refrigeration condition compressor is provided. The control method for a power battery refrigeration condition compressor is applied to a control system of a power battery refrigeration condition compressor. The control system of the power battery refrigeration condition compressor includes a water cooling unit, a first temperature detection device, a second temperature detection device, and a controller. The water cooling unit includes a compressor. The control method for the power battery refrigeration condition compressor includes:

[0006] Based on the first temperature detection device and the second temperature detection device, the inlet temperature and the outlet temperature of the water cooling unit are respectively collected;

[0007] The controller determines a first set temperature deviation signal according to the inlet temperature and the outlet temperature, and determines a second set temperature deviation signal according to the outlet temperature and the target temperature of the water cooling unit;

[0008] The controller performs hysteresis group control on the first set temperature deviation signal, performs PID control on the second set temperature deviation signal, and outputs a speed signal of the compressor, and the compressor operates according to the speed signal.

[0009] Optionally, before respectively collecting the inlet temperature and the outlet temperature of the water cooling unit based on the first temperature detection device and the second temperature detection device, the method further includes:

[0010] The cooling mode of the water cooling unit and the target temperature of the water cooling unit are obtained.

[0011] Optionally, the controller performs hysteresis group control on the first set temperature deviation signal, including:

[0012] When the first set temperature deviation signal is greater than the preset maximum trigger value during the increasing process, the hysteresis unit is turned on and starts to output a signal;

[0013] When the first set temperature deviation signal is less than the preset minimum trigger value during the decreasing process, the hysteresis unit is turned off and stops outputting signals.

[0014] Optionally, the controller performs PID control on the second set temperature deviation signal, comprising:

[0015] Performing filtering processing on the second set temperature deviation signal by a first-order inertial unit;

[0016] performing smoothing and averaging processing on the second set temperature deviation signal after filtering;

[0017] The second set temperature deviation signal after smoothing and averaging is corrected by a piecewise hysteresis function.

[0018] According to another aspect of the present invention, a control system for a power battery refrigeration compressor is provided. The control system for the power battery refrigeration compressor includes: a water cooling unit, a water pump and a kettle;

[0019] The water cooling unit comprises: a compressor, a condenser, a throttle valve and a plate heat exchanger, the water pump is connected to the plate heat exchanger, the throttle valve and the condenser in sequence, and the compressor is connected between the condenser and the throttle valve;

[0020] It also includes: a first temperature detection device, a second temperature detection device and a controller, the first temperature detection device is connected to the kettle, the water pump and the controller, and the second temperature detection device is connected to the plate heat exchanger and the controller;

[0021] The first temperature detection device is used to transmit the collected inlet temperature of the water cooling unit to the controller, and the second temperature detection device is used to transmit the collected outlet temperature of the water cooling unit to the controller;

[0022] The controller determines a first set temperature deviation signal according to the inlet temperature and the outlet temperature, and determines a second set temperature deviation signal according to the outlet temperature and the target temperature of the water cooling unit;

[0023] The controller performs hysteresis group control on the first set temperature deviation signal, performs PID control on the second set temperature deviation signal, and outputs a speed signal of the compressor, and the compressor is used to operate according to the speed signal.

[0024] Optionally, the control system of the power battery refrigeration condition compressor also includes a battery pack;

[0025] The battery pack includes: a power battery, a liquid cooling plate and a battery management system, the power battery and the battery management system are located on the liquid cooling plate, the liquid cooling plate is connected to the second temperature detection device, and the liquid cooling plate is used to dissipate heat for the power battery;

[0026] The battery management system is connected to the controller and the compressor in sequence, and the battery management system is used to output the cooling mode of the water cooling unit and the target temperature of the water cooling unit to the controller.

[0027] Optionally, the first temperature detection device includes a water inlet temperature sensor;

[0028] The first end of the water inlet temperature sensor is connected to the kettle through an external water pipe, the second end of the water inlet temperature sensor is connected to the water pump, and the third end of the water inlet temperature sensor is connected to the controller.

[0029] Optionally, the second temperature detection device includes a water outlet temperature sensor;

[0030] The first end of the outlet water temperature sensor is connected to the plate heat exchanger, the second end of the outlet water temperature sensor is connected to the liquid cooling plate, and the third end of the outlet water temperature sensor is connected to the controller.

[0031] According to another aspect of the present invention, there is also provided an electronic device, the electronic device comprising:

[0032] one or more processors;

[0033] A memory for storing one or more programs;

[0034] When the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the power battery refrigeration condition compressor as described in any embodiment of the present invention.

[0035] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the control method of the power battery refrigeration condition compressor as described in any embodiment of the present invention is implemented.

[0036] The technical solution of the embodiment of the present invention adopts the target temperature, the outlet temperature and the inlet temperature as the input targets to obtain the first set temperature deviation signal and the second set temperature deviation signal. The controller adopts the segmented hysteresis control method to process the second set temperature deviation signal. The controller adopts the improved PID control method to process the second set temperature deviation signal, and finally outputs the speed signal of the compressor. The compressor operates according to the speed signal, the water cooling unit realizes refrigeration, and the power battery cools down. The present invention adopts the improved PID control and hysteresis group control method, which can reduce the temperature fluctuation and the frequent start and stop and fluctuation of the compressor speed, extend the life of the compressor and enhance the user experience. In summary, the present invention solves the problems of unstable outlet temperature control and compressor speed fluctuation in the existing control method, the frequent start of the compressor will affect the life of the compressor, and the start and stop vibration of the compressor will affect the user experience.

[0037] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 It is a structural schematic diagram of a control system of a power battery refrigeration condition compressor provided in an embodiment of the present invention;

[0040] Figure 2 is a flow chart of a method for controlling a compressor in a power battery refrigeration condition according to an embodiment of the present invention;

[0041] Figure 3 is a flow chart of a power battery cooling control provided according to an embodiment of the present invention;

[0042] Figure 4 is a logic diagram of a refrigeration compressor speed control provided according to an embodiment of the present invention;

[0043] Figure 5is a schematic diagram of the operation of a saturation integration unit provided according to an embodiment of the present invention;

[0044] Figure 6 is a schematic diagram of an existing conventional PID control provided according to an embodiment of the present invention;

[0045] Figure 7 is a schematic diagram of an improved PID control provided according to an embodiment of the present invention;

[0046] Figure 8 This is a simulation model diagram of a control system of a power battery refrigeration compressor provided in accordance with an embodiment of the present invention;

[0047] Fig. 9 This is a schematic diagram of simulation results of 6 fast charging and cooling operations in 12 hours in high temperature weather according to an embodiment of the present invention;

[0048] Fig.10 This is another schematic diagram of simulation results of 6 fast charging and cooling operations in 12 hours in high temperature weather provided by an embodiment of the present invention;

[0049] Fig.11 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] An embodiment of the present invention provides a control method for a power battery refrigeration condition compressor. The control method for a power battery refrigeration condition compressor is applied to a control system of a power battery refrigeration condition compressor. Figure 1 is a schematic diagram of a control system for a power battery refrigeration compressor according to an embodiment of the present invention, with reference to Figure 1 The control system of the power battery refrigeration compressor includes a water cooling unit 10, a first temperature detection device 40, a second temperature detection device 50 and a controller 60. The water cooling unit 10 includes a compressor 101. Figure 2 is a flow chart of a control method for a power battery refrigeration compressor according to an embodiment of the present invention, with reference to Figure 2 , the control method of the compressor in the power battery refrigeration condition includes:

[0053] S110, collecting the inlet temperature and the outlet temperature of the water cooling unit based on the first temperature detection device and the second temperature detection device respectively.

[0054] Specific, combined Figure 1 The first temperature detection device 40 collects the inlet temperature T2 of the external water inlet pipe of the water cooling unit 10 and transmits it to the controller 60 , and the second temperature detection device 50 collects the outlet temperature T1 of the external water outlet pipe of the water cooling unit 10 and transmits it to the controller 60 .

[0055] S120, the controller determines a first set temperature deviation signal according to the inlet temperature and the outlet temperature, and determines a second set temperature deviation signal according to the outlet temperature and the target temperature of the water cooling unit.

[0056] Specific, combined Figure 1 Since there is a temperature deviation between the inlet temperature and the outlet temperature, the controller 60 subtracts the outlet temperature from the inlet temperature to obtain a first set temperature deviation signal; since there is a temperature deviation between the outlet temperature and the target temperature, the controller 60 subtracts the outlet temperature from the target temperature to obtain a second set temperature deviation signal.

[0057] S130, the controller performs hysteresis group control on the first set temperature deviation signal, the controller performs PID control on the second set temperature deviation signal, and outputs a speed signal of the compressor, and the compressor operates according to the speed signal.

[0058] Specific, combined Figure 1 The control logic of the controller 60 is segmented hysteresis control and PID control, which is suitable for different commercial vehicle power battery application environments (different water flow speeds, different battery pack capacities and quantities). The controller 60 uses the hysteresis unit to perform hysteresis group control on the first set temperature deviation signal to prevent the output signal from fluctuating with the input signal.

[0059] Conventional PID control, for situations where a constant cooling capacity is required, requires the integration of the deviation between the outlet temperature and the set temperature to obtain a certain compressor speed, and there is a certain deviation in the outlet temperature. In order to reduce this deviation, the controller 60 uses a piecewise hysteresis function to correct the second set temperature deviation signal. Finally, under the control logic operation inside the controller 60, the speed signal of the compressor 101 is output, and the compressor 101 in the water cooling unit 10 operates according to the speed signal output by the controller 60, the water cooling unit 10 realizes refrigeration, and the power battery realizes cooling.

[0060] The technical solution of the embodiment of the present invention adopts the target temperature, the outlet temperature and the inlet temperature as the input targets to obtain the first set temperature deviation signal and the second set temperature deviation signal. The controller adopts the segmented hysteresis control method to process the second set temperature deviation signal. The controller adopts the improved PID control method to process the second set temperature deviation signal, and finally outputs the speed signal of the compressor. The compressor operates according to the speed signal, the water cooling unit realizes refrigeration, and the power battery cools down. The present invention adopts the improved PID control and hysteresis group control method, which can reduce the temperature fluctuation and the frequent start and stop and fluctuation of the compressor speed, extend the life of the compressor and enhance the user experience. In summary, the present invention solves the problems of unstable outlet temperature control and compressor speed fluctuation in the existing control method, the frequent start of the compressor will affect the life of the compressor, and the start and stop vibration of the compressor will affect the user experience.

[0061] Optionally, before respectively collecting the inlet temperature and the outlet temperature of the water cooling unit based on the first temperature detection device and the second temperature detection device, the method further includes:

[0062] Get the cooling mode and target temperature of the water cooling unit.

[0063] Specifically, Figure 3 is a flowchart of a power battery cooling control provided according to an embodiment of the present invention, with reference to Figure 3 The Battery Management System (BMS) outputs the cooling mode and target temperature of the refrigeration unit according to the charging and discharging needs of the power battery and sends them to the controller; the controller controls the operation of the internal components in the water cooling unit according to the signal requirements of the BMS and the signals it receives.

[0064] In the cooling mode, the control of the water cooling unit is specifically as follows: the collected signals are the outlet water temperature signal and the inlet water temperature signal, and the compressor speed signal is output under the control logic operation inside the controller. The compressor in the water cooling unit operates according to the speed signal output by the controller to achieve refrigeration, power battery cooling, and achieve the temperature control target.

[0065] Optionally, the controller performs hysteresis group control on the first set temperature deviation signal, including:

[0066] When the first set temperature deviation signal is greater than the preset maximum trigger value during the increasing process, the hysteresis unit is turned on and starts to output a signal;

[0067] When the first set temperature deviation signal is less than the preset minimum trigger value during the decreasing process, the hysteresis unit is turned off and stops outputting signals.

[0068] Specifically, Figure 4 is a logic diagram of a refrigeration compressor speed control provided according to an embodiment of the present invention, with reference to Figure 4 , Figure 4 There are mainly two control loops: improved PID control and hysteresis group control. Among them, the hysteresis unit is also called a switch trigger unit with hysteresis, or a hysteresis unit. There are two trigger values ​​in the hysteresis unit parameters, a small setting value and a large setting value. If the input first setting temperature deviation signal is higher than the large setting value during the increase process, the hysteresis unit is turned on. If the input first setting temperature deviation signal is lower than the small setting value during the decrease process, the hysteresis unit will be turned off. The function is to prevent the output signal from fluctuating with the input signal.

[0069] Optionally, the controller performs PID control on the second set temperature deviation signal, including:

[0070] Filtering the second set temperature deviation signal by a first-order inertial unit;

[0071] Performing smoothing and averaging processing on the second set temperature deviation signal after filtering;

[0072] The second set temperature deviation signal after smoothing and averaging is corrected by a piecewise hysteresis function.

[0073] For details, please refer to Figure 4 The input of the second set temperature deviation signal and the output of the second set temperature deviation signal after processing are filtered, and the first-order inertial unit is used to improve the stability of system control. In the refrigeration cycle, the input second set temperature deviation signal is rounded and filtered to reduce input fluctuations; in the refrigeration cycle, the output speed signal is filtered to reduce the speed change of the compressor.

[0074] Figure 4 The first-order inertial unit in the filter performs filtering processing on the second set temperature deviation signal input with high frequency change; Figure 4 The smoothing average in the above means that the second set temperature deviation signal after filtering input during the slip period is averaged and used as the current value to eliminate the influence of the extreme value; Figure 4 The differential unit in is the differential unit in PID control; Figure 4 The dead zone units 1 and 2 in the PID control are used to: when the absolute value of the input second set temperature deviation signal is less than the set value (such as 0.2), it is taken as 0; when it is other values, the set value is moved to the x-axis; the dead zone unit of the proportional term in the PID control is used to filter the deviation of the temperature signal rounding, so that the temperature fluctuation has less influence on the speed.

[0075] Figure 4 The saturated integral in the program is used to: if the integral parameter reaches the target value (such as 0.2), the integral parameter remains unchanged; if the integral value of the long-term deviation of the deviation signal is not large, it can respond quickly after the integral variable changes its sign. By adopting the PID integral saturation solution, the deviation of temperature control is handled, so that the temperature fluctuation has less impact on the speed of the compressor.

[0076] Figure 5 is a schematic diagram of the operation of a saturated integral unit provided according to an embodiment of the present invention, with reference to Figure 5 , Figure 5 a is the long-term deviation of the signal, and the integral does not exceed the limit; b is that after the signal sign changes, the integral value can respond quickly.

[0077] Figure 6 is a schematic diagram of an existing conventional PID control provided according to an embodiment of the present invention, Figure 7 is a schematic diagram of an improved PID control provided according to an embodiment of the present invention, with reference to Figure 6 and Figure 7 In conventional PID control, when a constant cooling capacity is required, it is necessary to obtain a certain compressor speed by integrating the deviation between the outlet temperature and the set temperature, and there is a certain deviation in the outlet temperature. In order to reduce this deviation, an embodiment of the present invention provides a segmented hysteresis function to correct the second set temperature deviation signal after smoothing and averaging. The power battery can be a lithium battery. The large heat capacity of the lithium battery itself can be used to buffer the heat generated during the charging and discharging process. The speed of the compressor is controlled by a segmented control method, which can reduce the frequent changes in the speed of the compressor.

[0078] Continue to refer Figure 1 , an embodiment of the present invention provides a control system for a power battery refrigeration condition compressor, the control system for the power battery refrigeration condition compressor comprises: a water cooling unit 10, a water pump 20 and a kettle 30;

[0079] The water cooling unit 10 comprises: a compressor 101, a condenser 102, a throttle valve 103 and a plate heat exchanger 104, a water pump 20 is connected to the plate heat exchanger 104, the throttle valve 103 and the condenser 102 in sequence, and the compressor 101 is connected between the condenser 102 and the throttle valve 103;

[0080] It also includes: a first temperature detection device 40, a second temperature detection device 50 and a controller 60, the first temperature detection device 40 is connected to the kettle 30, the water pump 20 and the controller 60, and the second temperature detection device 50 is connected to the plate heat exchanger 104 and the controller 60;

[0081] The first temperature detection device 40 is used to transmit the collected inlet temperature of the water cooling unit 10 to the controller 60, and the second temperature detection device 50 is used to transmit the collected outlet temperature of the water cooling unit 10 to the controller 60;

[0082] The controller 60 determines a first set temperature deviation signal according to the inlet temperature and the outlet temperature, and determines a second set temperature deviation signal according to the outlet temperature and the target temperature of the water cooling unit;

[0083] The controller 60 performs hysteresis group control on the first set temperature deviation signal, performs PID control on the second set temperature deviation signal, and outputs a speed signal of the compressor 101. The compressor 101 is used to operate according to the speed signal.

[0084] Specifically, the water cooling unit 10 is a refrigeration system, which is composed of four major refrigeration components (compressor 101, condenser 102, throttle valve 103 and plate heat exchanger 104). The water circuit exchanges the cold energy from the plate heat exchanger, which is a common refrigeration cycle process. The compressor 101 can use a variable frequency compressor to enable the water cooling unit to reach the set refrigeration power.

[0085] Continue to refer Figure 1 , Optionally, the control system of the power battery refrigeration condition compressor further includes a battery pack 70;

[0086] The battery pack 70 includes: a power battery 71, a liquid cooling plate 72 and a battery management system 73. The power battery 71 and the battery management system 73 are located on the liquid cooling plate 72. The liquid cooling plate 72 is connected to the second temperature detection device 50. The liquid cooling plate 72 is used to dissipate heat for the power battery 71.

[0087] The battery management system 73 is connected to the controller 60 and the compressor 101 in sequence, and the battery management system 73 is used to output the cooling mode of the water cooling unit and the target temperature of the water cooling unit to the controller 60 .

[0088] Specifically, the control system of the power battery refrigeration compressor includes three main parts: water cooling unit 10, battery pack 70, and peripheral parts (pipeline system (including kettle 30), wiring harness, power cord, etc.). The water cooling unit 10 is mainly composed of refrigeration fluorine circuit (key components: compressor 101, condenser 102, throttle valve 103, plate heat exchanger 104) and water circuit (water pump 20, PTC heater 21, inlet and outlet water pipes), electrical appliances ( Figure 2 The control part includes a controller 60, which collects the outlet temperature T1 and the inlet temperature T2 of the water path, obtains the cooling mode and target temperature of the battery management system 73, and outputs a speed signal of the compressor 101, and the compressor operates according to the speed signal.

[0089] The rest of the battery pack 70 is Figure 2 The battery pack 70 is mainly connected to the water channel part, which is used for heat and energy (electricity, Figure 2 Not shown) signal transmission.

[0090] According to the charging and discharging requirements of the power battery 71, the BMS outputs the cooling mode and target temperature of the water cooling unit 10 and sends them to the controller 60. The controller 60 controls the operation of the internal components in the water cooling unit 10 according to the signal requirements of the BMS and the signals received by itself. In the cooling mode, the control of the water cooling unit 10 is specifically as follows: the collected signals are the outlet water temperature signal and the inlet water temperature signal, and the compressor speed signal is output under the control logic operation inside the controller 60. The compressor 101 in the water cooling unit 10 operates according to the speed signal output by the controller 60 to achieve cooling, cool down the power battery 71, and achieve the temperature control target of the BMS.

[0091] Continue to refer Figure 1 , Optionally, the first temperature detection device 40 includes a water inlet temperature sensor;

[0092] A first end of the water inlet temperature sensor is connected to the kettle 30 through an external water pipe, a second end of the water inlet temperature sensor is connected to the water pump 20 , and a third end of the water inlet temperature sensor is connected to the controller 60 .

[0093] Specifically, the water inlet temperature sensor collects the inlet temperature of the water cooling unit 10 and transmits it to the controller 60 .

[0094] Continue to refer Figure 1 , Optionally, the second temperature detection device 50 includes a water outlet temperature sensor;

[0095] A first end of the outlet water temperature sensor is connected to the plate heat exchanger 104 , a second end of the outlet water temperature sensor is connected to the liquid cooling plate 72 , and a third end of the outlet water temperature sensor is connected to the controller 60 .

[0096] Specifically, the outlet water temperature sensor collects the outlet temperature of the water cooling unit 10 and transmits it to the controller 60 .

[0097] Figure 8 is a simulation model diagram of a control system of a power battery refrigeration compressor provided according to an embodiment of the present invention, with reference to Figure 8 , establish a simulation model, which includes the control of fluorine circuit circulation, water cooling circulation, battery pack, liquid plate and BMS input signal, temperature acquisition signal of water cooling unit, compressor control input speed signal, etc. By establishing the air conditioning fluorine circuit circulation, water circulation, and battery heat generation model; it also includes the temperature signal and the control signal part of the compressor. By establishing a simulation model, the temperature control is stable, the speed signal of the compressor input changes smoothly, and it can also be used to analyze the battery pack thermal management refrigeration strategy and determine the refrigeration demand.

[0098] Fig. 9 is a schematic diagram of simulation results of 6 fast charging and cooling operations in 12 hours in high temperature weather according to an embodiment of the present invention. Fig.10 2 is another schematic diagram of simulation results of 6 fast charging and cooling operations in 12 hours in high temperature weather according to an embodiment of the present invention. Fig. 9 and Fig.10 It is a cooling simulation under high temperature conditions, with fast charging and fast discharging six times a day. The results show that the target temperature is stable, the compressor speed fluctuates slightly, and the maximum temperature of the battery cell is about 40°C.

[0099] Fig.11 A schematic diagram of the structure of an electronic device 1 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0100] like Fig.11As shown, the electronic device 1 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 1 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0101] A number of components in the electronic device 1 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 1 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0102] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, for example, a method for controlling a DC bias voltage.

[0103] In some embodiments, the control method of the DC bias voltage can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 1 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the control method of the DC bias voltage described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the control method of the DC bias voltage in any other appropriate manner (for example, by means of firmware).

[0104] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0105] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0106] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0107] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0108] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0109] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0110] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0111] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for a power battery refrigeration compressor, characterized in that: A control system for a power battery refrigeration compressor, the control system for the power battery refrigeration compressor comprising a water cooling unit, a first temperature detection device, a second temperature detection device and a controller, the water cooling unit comprising a compressor, and a control method for the power battery refrigeration compressor comprising: Based on the first temperature detection device and the second temperature detection device, the inlet temperature and the outlet temperature of the water cooling unit are respectively collected; The controller determines a first set temperature deviation signal according to the inlet temperature and the outlet temperature, and determines a second set temperature deviation signal according to the outlet temperature and the target temperature of the water cooling unit; The controller performs hysteresis group control on the first set temperature deviation signal, performs PID control on the second set temperature deviation signal, and outputs a speed signal of the compressor, and the compressor operates according to the speed signal.

2. The method according to claim 1, characterized in that Before respectively collecting the inlet temperature and the outlet temperature of the water cooling unit based on the first temperature detection device and the second temperature detection device, the method further includes: The cooling mode of the water cooling unit and the target temperature of the water cooling unit are obtained.

3. The method according to claim 1, characterized in that The controller performs hysteresis group control on the first set temperature deviation signal, including: When the first set temperature deviation signal is greater than the preset maximum trigger value during the increasing process, the hysteresis unit is turned on and starts to output a signal; When the first set temperature deviation signal is less than the preset minimum trigger value during the decreasing process, the hysteresis unit is turned off and stops outputting signals.

4. The method according to claim 1, characterized in that: The controller performs PID control on the second set temperature deviation signal, comprising: Performing filtering processing on the second set temperature deviation signal by a first-order inertial unit; performing smoothing and averaging processing on the second set temperature deviation signal after filtering; The second set temperature deviation signal after smoothing and averaging is corrected by a piecewise hysteresis function.

5. A control system for a power battery refrigeration compressor, characterized in that: include: Water cooling unit, water pump and kettle; The water cooling unit comprises: a compressor, a condenser, a throttle valve and a plate heat exchanger, the water pump is connected to the plate heat exchanger, the throttle valve and the condenser in sequence, and the compressor is connected between the condenser and the throttle valve; It also includes: a first temperature detection device, a second temperature detection device and a controller, the first temperature detection device is connected to the kettle, the water pump and the controller, and the second temperature detection device is connected to the plate heat exchanger and the controller; The first temperature detection device is used to transmit the collected inlet temperature of the water cooling unit to the controller, and the second temperature detection device is used to transmit the collected outlet temperature of the water cooling unit to the controller; The controller determines a first set temperature deviation signal according to the inlet temperature and the outlet temperature, and determines a second set temperature deviation signal according to the outlet temperature and the target temperature of the water cooling unit; The controller performs hysteresis group control on the first set temperature deviation signal, performs PID control on the second set temperature deviation signal, and outputs a speed signal of the compressor, and the compressor is used to operate according to the speed signal.

6. The system according to claim 5, characterized in that Also includes battery pack; The battery pack includes: a power battery, a liquid cooling plate and a battery management system, the power battery and the battery management system are located on the liquid cooling plate, the liquid cooling plate is connected to the second temperature detection device, and the liquid cooling plate is used to dissipate heat for the power battery; The battery management system is connected to the controller and the compressor in sequence, and the battery management system is used to output the cooling mode of the water cooling unit and the target temperature of the water cooling unit to the controller.

7. The system according to claim 5, characterized in that The first temperature detection device includes a water inlet temperature sensor; The first end of the water inlet temperature sensor is connected to the kettle through an external water pipe, the second end of the water inlet temperature sensor is connected to the water pump, and the third end of the water inlet temperature sensor is connected to the controller.

8. The system according to claim 5, characterized in that The second temperature detection device includes a water outlet temperature sensor; The first end of the outlet water temperature sensor is connected to the plate heat exchanger, the second end of the outlet water temperature sensor is connected to the liquid cooling plate, and the third end of the outlet water temperature sensor is connected to the controller.

9. An electronic device, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the power battery refrigeration condition compressor as described in claims 1-4.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the power battery refrigeration condition compressor is implemented as described in claims 1-4.

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