Novel energy storage battery and PCS two-way liquid cooling heat management system and control method thereof

Abstract

The invention relates to the technical field of energy storage heat management, and discloses a novel energy storage battery and PCS two-way liquid cooling heat management system which comprises a compressor refrigeration unit, a battery liquid cooling unit, a PCS liquid cooling unit, a sensing assembly, a battery family, a PCS and a control module. The control module is electrically connected with the compressor refrigeration unit, the battery liquid cooling unit, the PCS liquid cooling unit and the sensing assembly and used for collecting real-time data of the sensing assembly and achieving accurate control over the compressor refrigeration unit, the battery liquid cooling unit and the PCS liquid cooling unit. The battery liquid cooling unit is connected with the battery family; the PCS liquid cooling unit is connected with the PCS; the compressor refrigeration unit and the battery liquid cooling unit are connected in parallel through a battery cooler, and the battery liquid cooling unit and the PCS liquid cooling unit are connected in parallel through a heat exchanger. According to the invention, the liquid cooling of the battery and the PCS is integrated in one set of liquid cooling system, so that the installation space is saved, different heat dissipation modes are adopted according to different environment temperatures, the energy consumption ratio of the system is improved, and the energy consumption and the operation cost are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage thermal management, and in particular to a novel energy storage battery and PCS dual-path liquid cooling thermal management system and a control method thereof. Background Art

[0002] With the rapid growth of renewable energy such as wind power and photovoltaic power generation, as well as the large difference between peak and valley power usage, the importance of energy storage technology has become increasingly prominent. The energy storage industry is a key technology field for solving the problem of large-scale power storage and dispatch. Influenced by multiple factors such as technological innovation, policy promotion, and market demand growth, the development of the energy storage industry has shown a booming trend in recent years.

[0003] Energy storage batteries are the basis of energy storage systems. Energy storage inverters are used to control the charging and discharging process of energy storage batteries and perform AC / DC conversion. They can directly power AC loads without a power grid. The use of energy storage batteries and PCS (Power Conversion System, energy storage inverter) requires relatively high temperature conditions. The control module for battery temperature is called a battery thermal management system. The performance of the thermal management system directly affects the safety and conversion efficiency of energy storage power stations and energy storage cabinets. With the rapid expansion of the energy storage industry, the energy storage thermal management industry has also expanded accordingly.

[0004] At present, batteries in the energy storage industry are mainly liquid-cooled, while PCS are mainly air-cooled. The cooling of batteries and PCS is divided into two different systems, which results in more thermal management equipment and occupies more space. In addition, in PCS air-cooling technology, the failure rate of PCS remains high due to environmental factors such as wind and sand. PCS liquid cooling can solve this problem, so energy storage power stations and energy storage cabinets have the need for dual-channel liquid cooling of batteries and PCS.

[0005] Currently, the industry's battery liquid cooling requires a relatively low water temperature, while the PCS liquid cooling requires a relatively high water temperature. This solution is to solve the dual-path liquid cooling circuit and can meet the respective liquid cooling temperature requirements. There are also some energy storage battery and / or PCS liquid cooling thermal management systems in the prior art, such as the Chinese invention patent with application number 202410704910.1, entitled A thermal management system and method for a liquid cooling unit of an energy storage battery. It can make scheduling decisions for the liquid cooling unit of the target energy storage battery based on the real-time monitored temperature of the energy storage battery. When it is determined that scheduling is required, the operating status of the liquid cooling unit is evaluated. If the operating status evaluation passes, the most appropriate thermal management decision is determined based on the liquid cooling unit simulation model to perform thermal management of the energy storage battery liquid cooling unit, thereby improving the suitability of the thermal management strategy and the management efficiency. However, it mainly carries out thermal management for energy storage batteries and does not involve PCS liquid cooling thermal management.

[0006] Another example is the Chinese invention patent with application number 202410623520.1, entitled Battery Management Method and System for Liquid-Cooled Energy Storage System. It connects to the liquid-cooled energy storage system to read liquid cooling data; obtains ambient temperature data and battery work task data to establish temperature measurement results; performs multi-objective optimization based on liquid cooling data and cooling requirements; generates a cooling control strategy, and performs cooling control with the cooling control strategy, thereby achieving precise control and management of battery temperature and achieving the technical effect of improving the heat dissipation efficiency of the energy storage system and battery performance. However, it also mainly conducts thermal management for energy storage batteries, and does not involve PCS liquid cooling thermal management. Summary of the invention

[0007] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a new type of energy storage battery and PCS dual-path liquid cooling thermal management system, which integrates the liquid cooling of the battery and PCS in a set of liquid cooling system, can simultaneously meet the different water temperature requirements of battery liquid cooling and PCS liquid cooling, save installation space, adopt different heat dissipation methods according to different ambient temperatures, improve the system energy consumption ratio, save energy consumption and operating costs.

[0008] The present invention is implemented by the following technical scheme: a novel energy storage battery and PCS dual-path liquid cooling thermal management system, comprising a compressor refrigeration unit, a battery liquid cooling unit, a PCS liquid cooling unit, a sensor assembly, a battery group, a PCS and a control module; the control module is respectively connected to the compressor refrigeration unit, the battery liquid cooling unit, and the PCS liquid cooling unit, and is electrically connected to the sensor assembly, for collecting real-time data of the sensor assembly, and realizing precise control of the compressor refrigeration unit, the battery liquid cooling unit, and the PCS liquid cooling unit; the battery liquid cooling unit is connected to the battery group, for performing heat exchange on the battery group; the PCS liquid cooling unit is connected to the PCS, for performing heat exchange on the PCS; the compressor refrigeration unit and the battery liquid cooling unit are connected in parallel through a battery cooler, the battery liquid cooling unit and the PCS liquid cooling unit are connected in parallel through a heat exchanger, and the compressor refrigeration unit is used to provide cooling to the battery liquid cooling unit and the PCS liquid cooling unit.

[0009] Furthermore, the battery liquid cooling unit includes a battery cooler, a PTC heater, a battery cluster, a first water pump and a heat exchanger, wherein the first outlet end of the battery cooler is connected to the inlet end of the PTC heater through a pipeline, the outlet end of the PTC heater is connected to the inlet end of the battery cluster through a pipeline, the outlet end of the battery cluster is connected to the inlet end of the first water pump through a pipeline, the outlet end of the first water pump is connected to the first inlet end of the heat exchanger through a pipeline, and the first outlet end of the heat exchanger is connected to the first inlet end of the battery cooler through a pipeline.

[0010] Furthermore, the PCS liquid cooling unit includes a PCS, a second water pump, a three-way water valve, a first branch and a second branch; the first branch includes a heat exchanger connected in parallel with the battery liquid cooling unit, the second branch includes a heat dissipation water tank and a fan shared with the compressor refrigeration unit, the outlet end of the PCS is connected to the inlet end of the second water pump through a pipeline, the outlet end of the second water pump is connected to the inlet end a of the three-way water valve through a pipeline, the first outlet end b of the three-way water valve is connected to the inlet end of the first branch through a pipeline, the second outlet end c of the three-way water valve is connected to the inlet end of the second branch through a pipeline, and the outlet ends of the first branch and the second branch are connected to the inlet end of the PCS after merging.

[0011] Furthermore, the compressor refrigeration unit includes a compressor, a condenser, an electronic expansion valve, a battery cooler and a fan. The outlet end of the compressor is connected to the inlet end of the condenser through a pipeline, and the outlet end of the condenser is connected to the second inlet end of the battery cooler through a pipeline. The electronic expansion valve is installed on the pipeline between the outlet end of the condenser and the second inlet end of the battery cooler, and the second outlet end of the battery cooler is connected to the inlet end of the compressor through a pipeline. The fan is used to accelerate the flow of wind to dissipate heat for the condenser, and the fan is a fan shared with the heat dissipation water tank of the second branch in the PCS liquid cooling unit.

[0012] Further, the sensing unit includes a first temperature and pressure sensor, a second temperature and pressure sensor, a third temperature and pressure sensor, a fourth temperature and pressure sensor, a fifth temperature and pressure sensor, a sixth temperature and pressure sensor and a first temperature sensor, wherein the first temperature and pressure sensor is installed on the inlet pipe of the compressor to detect the inlet temperature and pressure of the compressor; the second temperature and pressure sensor is installed on the outlet pipe of the compressor to detect the outlet temperature and pressure of the compressor; the third temperature and pressure sensor is installed on the inlet pipe of the battery group to detect the temperature and pressure of the liquid supply inlet of the battery group; the fourth temperature and pressure sensor is installed on the outlet pipe of the battery group to detect the The temperature and pressure of the liquid supply outlet of the battery family; the fifth temperature and pressure sensor is installed on the inlet pipe of the PCS, and is used to detect the temperature and pressure of the liquid supply inlet of the PCS; the sixth temperature and pressure sensor is installed on the outlet pipe of the PCS, and is used to detect the temperature and pressure of the liquid supply outlet of the PCS; the first temperature sensor is arranged at the dual-path liquid cooling thermal management system, and is used to detect the ambient temperature of the dual-path liquid cooling thermal management system; the control module is electrically connected to the first temperature and pressure sensor, the second temperature and pressure sensor, the third temperature and pressure sensor, the fourth temperature and pressure sensor, the fifth temperature and pressure sensor, the sixth temperature and pressure sensor, and the first temperature sensor, and is used to collect and process real-time data of the sensor components.

[0013] A novel energy storage battery and PCS dual-path liquid cooling thermal management system control method, using the novel energy storage battery and PCS dual-path liquid cooling thermal management system, includes the following steps: Step 1: A thermal management control strategy is built into the control module, and a critical operating temperature value Ta of the thermal management control is set. Ta is the critical ambient temperature value at which the PCS can dissipate heat through the heat dissipation water tank, and Tb is the critical temperature value at which the battery family can dissipate heat through the heat dissipation water tank (15). According to the working conditions, Ta is 35~45°C and Tb is 0~10°C.

[0014] Step 2: The control module collects and obtains real-time sensor data from various locations through the sensor component, wherein the ambient temperature collected by the first temperature sensor is T, and different control strategies are controlled and output according to the ambient temperature T; Step 3: When the battery cells in the battery family and the PCS have cooling requirements and the ambient temperature T>Ta; the control module controls the compressor refrigeration unit to start the refrigeration work, controls the first water pump to start, and the PTC heater is not turned on, and the three-way water valve in the PCS liquid cooling unit is switched to the first branch, that is, the three-way water valve is switched to connect ends a and b, the second water pump is turned on, and the fan is turned on, and the heat emitted by the battery family and the PCS is uniformly released into the air through the condenser and fan in the compressor refrigeration unit; Step 4: When both the battery group and the PCS have cooling requirements, Tb<ambient temperature T≤Ta; the PCS can achieve heat dissipation through the heat dissipation water tank, the control module controls the compressor refrigeration unit to start refrigeration, the first water pump is turned on, the PTC heater is not turned on, the three-way water valve in the PCS liquid cooling unit is switched to the second branch, that is, the three-way valve is switched to connect ends a and c, the second water pump is turned on, and the fan is turned on; the heat emitted by the battery group is released into the air through the condenser and fan of the compressor refrigeration unit, and the heat emitted by the PCS is released into the air through the heat dissipation water tank and fan, wherein the condenser and the heat dissipation water tank share the same fan; Step 5: When the battery family and PCS have cooling requirements, the ambient temperature T≤Tb, the control module controls the compressor refrigeration unit not to start cooling, the compressor is not turned on, the electronic expansion valve is not actuated, the first water pump of the battery liquid cooling unit is turned on, the PTC heater is not turned on, the three-way water valve in the PCS liquid cooling unit is in the middle opening, that is, a, b, c are all connected, the fan is turned on, the second water pump is not turned on, the heat emitted by the battery is taken away through the heat exchanger, and the heat is released into the air through the PCS side heat dissipation water tank and fan; Step 6: When the battery family has no cooling and heating requirements and the PCS has no cooling and heating requirements, the compressor refrigeration unit does not start working, the first water pump of the battery liquid cooling unit is turned on, and the PTC heater is not turned on, maintaining the uniform temperature mode; the second water pump of the PCS liquid cooling unit works at the lowest speed and the fan is not turned on.

[0015] Step 7: The battery cell temperature has a heating demand, and the PCS has no cooling or heating demand. At this time, the compressor refrigeration unit does not start the refrigeration work, the first water pump of the battery liquid cooling unit is turned on, the PTC heater is turned on, and the three-way water valve in the PCS liquid cooling unit is switched to connect the a and c ends. The second water pump runs at the lowest speed and the fan is not turned on. At this time, the heat demand of the battery is provided by the PTC heater of the battery liquid cooling unit.

[0016] Step 8: When the battery cell temperature has no cooling or heating requirements, the PCS has cooling requirements, and the ambient temperature T>Ta, the compressor refrigeration unit starts cooling, the first water pump of the battery liquid cooling unit is turned on, the PTC heater is not turned on, and the three-way water valve in the PCS liquid cooling unit is switched to the first circuit, that is, the three-way valve is switched to connect ends a and b, the second water pump is turned on, and the fan is turned on. At this time, the heat emitted by the PCS is released into the air through the condenser and the fan.

[0017] Step nine: When the battery cell temperature has no cooling or heating requirements, the PCS has cooling requirements, and the ambient temperature T≤Ta, the compressor refrigeration unit does not start the refrigeration work, the first water pump of the battery liquid cooling unit is turned on, the PTC heater is not turned on, and the three-way water valve in the PCS liquid cooling unit is switched to the second circuit, that is, the three-way valve is switched to connect the a and c terminals, the second water pump is turned on, and the fan is turned on. At this time, the battery liquid cooling unit is in the uniform temperature mode, and the heat emitted by the PCS is released into the air through the heat sink and the fan.

[0018] Step 10: When the battery cell temperature has a cooling demand, the PCS has no cooling or heating demand, and the ambient temperature T>Tb, the compressor refrigeration unit is turned on, the first water pump is turned on, the PTC heater is not turned on, and the three-way water valve in the PCS liquid cooling unit is switched to the second branch, that is, the three-way water valve is switched to connect ends a and c, the second water pump runs at the lowest speed, and the fan is turned on, so that the heat emitted by the battery group is released into the air through the condenser and fan in the compressor refrigeration unit; Step 11: When the battery cell temperature has a cooling demand, the PCS has no cooling or heating demand, and the ambient temperature T≤Tb, the compressor refrigeration unit does not start working, the first water pump is controlled to start, the PTC heater is not turned on, and the three-way water valve in the PCS liquid cooling unit is switched to the second branch, that is, the three-way water valve is switched to connect the a and c terminals, the second water pump is turned on, and the fan is turned on to release the heat emitted by the battery family into the air through the cooling water tank and the fan.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. The novel dual-path liquid-cooled thermal management system for energy storage batteries and PCS and the control method thereof of the present invention improve the existing PCS air cooling technology. The PCS heat is dissipated by liquid cooling, which can effectively solve the problem that the external wind and sand affect the life and performance of the PCS due to the PCS air cooling heat dissipation. By integrating the liquid cooling of the battery and the liquid cooling of the PCS in a set of liquid cooling system, the different water temperature requirements of the battery liquid cooling and the PCS liquid cooling can be met at the same time, saving installation space and reducing importance and cost.

[0020] 2. The present invention provides a novel dual-path liquid cooling thermal management system for energy storage batteries and PCS and its control method. Different heat dissipation methods are used at different ambient temperatures. The liquid cooling of the PCS is divided into two branches through a three-way valve. When the ambient temperature is lower than a certain temperature, it switches to the second branch, opens the heat dissipation water tank to dissipate heat directly, and does not dissipate heat through a compression refrigeration unit, which greatly saves energy consumption, improves the system energy consumption ratio, and saves operating costs. When the ambient temperature is lower than a certain temperature, the heat of the battery is taken out through the heat exchanger, and the heat is dissipated to the environment through the heat dissipation water tank by the fan, which can realize the function of natural cooling; when the ambient temperature is high, a compressor refrigeration unit is used for cooling to achieve energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the connection structure of the novel energy storage battery and the PCS dual-path liquid cooling thermal management system of the present invention; Figure 2 It is a connection diagram of the present invention when the ambient temperature T>Ta, the PCS has a cooling demand, and the battery family has a cooling demand or has no cooling and no heating demand; Figure 3 It is a connection diagram of the present invention when the ambient temperature Tb<T≤Ta, the battery family has a cooling demand, the PCS has a cooling demand, or when the ambient temperature T>Tb, the battery family has a cooling demand, and the PCS has no cooling or heating demand; Figure 4 It is a connection diagram of the present invention when the ambient temperature T≤Tb, the battery family has a cooling demand, the PCS has a cooling demand, or has no cooling and no heating demand; Figure 5 This is a schematic diagram of the connection of the present invention when the battery family has no cooling demand and the PCS has no cooling or heating demand; Figure 6 It is a connection diagram of the present invention when the ambient temperature T≤Ta, the battery family has no cooling and heating requirements, and the PCS has cooling requirements.

[0022] In the figure: compressor-1; condenser-2; electronic expansion valve-3; battery cooler-4; fan-5; water PTC heater-6; battery family-7; first water pump-9; heat exchanger-10; PCS-11; second water pump-13; three-way water valve-14; heat dissipation water tank-15; first temperature and pressure sensor-16; second temperature and pressure sensor-17; third temperature and pressure sensor-18; fourth temperature and pressure sensor-19; fifth temperature and pressure sensor-20; sixth temperature and pressure sensor-21; first temperature sensor-22; control module-23. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] The purpose of the present invention is to provide a new energy storage battery and PCS dual-path liquid cooling thermal management system in view of the defects of the prior art. Example

[0025] A new type of energy storage battery and PCS dual-path liquid cooling thermal management system, refer to Figure 1 As shown, it includes a compressor refrigeration unit, a battery liquid cooling unit, a PCS liquid cooling unit, a sensor component, a battery group 7, a PCS 11 and a control module 23; the control module 23 is respectively connected to the compressor refrigeration unit, the battery liquid cooling unit, the PCS liquid cooling unit, and the sensor component, and is used to collect real-time data of the sensor component to achieve precise control of the compressor refrigeration unit, the battery liquid cooling unit, and the PCS liquid cooling unit; the battery liquid cooling unit is connected to the battery group 7 for heat exchange with the battery group 7; the PCS liquid cooling unit is connected to the PCS 11 for heat exchange with the PCS 11; the compressor refrigeration unit and the battery liquid cooling unit are connected in parallel through the battery cooler 4, and the battery liquid cooling unit and the PCS liquid cooling unit are connected in parallel through the heat exchanger 10, and the compressor refrigeration unit is used to provide cooling to the battery liquid cooling unit and the PCS liquid cooling unit.

[0026] The battery liquid cooling unit includes a battery cooler 4, a PTC heater 6, a battery cluster 7, a first water pump 9 and a heat exchanger 10. The first outlet end of the battery cooler 4 is connected to the inlet end of the PTC heater 6 through a pipeline, the outlet end of the PTC heater 6 is connected to the inlet end of the battery cluster 7 through a pipeline, the outlet end of the battery cluster 7 is connected to the inlet end of the first water pump 9 through a pipeline, the outlet end of the first water pump 9 is connected to the first inlet end of the heat exchanger 10 through a pipeline, and the first outlet end of the heat exchanger 10 is connected to the first inlet end of the battery cooler 4 through a pipeline.

[0027] The PCS liquid cooling unit includes PCS11, a second water pump 13, a three-way water valve 14, a first branch and a second branch; the first branch includes a heat exchanger 10 connected in parallel with the battery liquid cooling unit, the second branch includes a heat dissipation water tank 15 and a fan 5 shared with the compressor refrigeration unit, the outlet end of PCS11 is connected to the inlet end of the second water pump 13 through a pipeline, the outlet end of the second water pump 13 is connected to the inlet end of the three-way water valve 14 through a pipeline, the first outlet end of the three-way water valve 14 is connected to the inlet end of the first branch through a pipeline, the second outlet end of the three-way water valve 14 is connected to the inlet end of the second branch through a pipeline, and the outlet ends of the first branch and the second branch are connected to the inlet end of PCS11 after merging.

[0028] The compressor refrigeration unit includes a compressor 1, a condenser 2, an electronic expansion valve 3, a battery cooler 4 and a fan 5. The outlet end of the compressor 1 is connected to the inlet end of the condenser 2 through a pipeline, and the outlet end of the condenser 2 is connected to the second inlet end of the battery cooler 4 through a pipeline. The electronic expansion valve 3 is installed on the pipeline between the outlet end of the condenser 2 and the second inlet end of the battery cooler 4. The second outlet end of the battery cooler 4 is connected to the inlet end of the compressor 1 through a pipeline. The fan 5 is used to accelerate the air flow and heat dissipation of the condenser 2. The fan 5 is a fan shared with the heat dissipation water tank 15 of the second branch in the PCS liquid cooling unit.

[0029] The sensing unit includes a first temperature and pressure sensor 16, a second temperature and pressure sensor 17, a third temperature and pressure sensor 18, a fourth temperature and pressure sensor 19, a fifth temperature and pressure sensor 20, a sixth temperature and pressure sensor 21 and a first temperature sensor 22. The first temperature and pressure sensor 16 is installed on the inlet pipe of the compressor 1 to detect the inlet temperature and pressure of the compressor 1; the second temperature and pressure sensor 17 is installed on the outlet pipe of the compressor 1 to detect the outlet temperature and pressure of the compressor 1; the third temperature and pressure sensor 18 is installed on the inlet pipe of the battery family 7 to detect the outlet temperature and pressure of the compressor 1. Detect the temperature and pressure of the liquid supply inlet of the battery family 7; the fourth temperature and pressure sensor 19 is installed on the outlet pipe of the battery family 7 to detect the temperature and pressure of the liquid supply outlet of the battery family 7; the fifth temperature and pressure sensor 20 is installed on the inlet pipe of the PCS11 to detect the temperature and pressure of the liquid supply inlet of the PCS11; the sixth temperature and pressure sensor 21 is installed on the outlet pipe of the PCS11 to detect the temperature and pressure of the liquid supply outlet of the PCS11; the first temperature sensor 22 is set at the dual-channel liquid cooling thermal management system to detect the ambient temperature of the dual-channel liquid cooling thermal management system. The control module 23 is electrically connected to the first temperature and pressure sensor 16, the second temperature and pressure sensor 17, the third temperature and pressure sensor 18, the fourth temperature and pressure sensor 19, the fifth temperature and pressure sensor 20, the sixth temperature and pressure sensor 21, and the first temperature sensor 22, and is used to collect and process real-time data of the sensor components. Example

[0030] A new type of energy storage battery and PCS dual-path liquid cooling thermal management system, refer to Figure 1 As shown, a novel energy storage battery and PCS dual-path liquid cooling thermal management system control method uses the above novel energy storage battery and PCS dual-path liquid cooling thermal management system, including the following steps: Step 1: A thermal management control strategy is built into the control module 23 to set a critical working temperature value Ta of the thermal management control, where Ta is the critical ambient temperature at which the PCS 11 can dissipate heat through the heat dissipation water tank 15, and Tb is the critical opening temperature value of the second water pump 13; Step 2: The control module 23 acquires real-time sensor data from various locations through the sensor components, wherein the ambient temperature acquired by the first temperature sensor 22 is T, and controls and outputs different control strategies according to the ambient temperature T; Step 3: When the battery cells in battery family 7 and PCS 11 both have cooling requirements and the ambient temperature T>40°C; refer to Figure 2As shown, the control module 23 controls the compressor refrigeration unit to start refrigeration work, controls the first water pump 9 to start, the PTC heater 6 not to start, the three-way water valve 14 in the PCS liquid cooling unit is switched to the first branch, that is, the three-way water valve is switched to the a and b ends connected, the second water pump 13 is turned on, the fan 5 is turned on, and the heat emitted by the battery group 7 and the PCS 11 is uniformly released to the air through the condenser 2 and the fan 5 in the compressor refrigeration unit; Step 4: When 5℃<ambient temperature T≤40℃, both battery family 7 and PCS11 have cooling requirements; refer to Figure 3 As shown, PCS11 can achieve heat dissipation through the heat dissipation water tank 15, the control module 23 controls the compressor refrigeration unit to start refrigeration, the first water pump 9 is turned on, the PTC heater 6 is not turned on, the three-way water valve 14 in the PCS liquid cooling unit is switched to the second branch, that is, the three-way valve is switched to the connection between the a and c ends, the second water pump 13 is turned on, and the fan 5 is turned on; the heat emitted by the battery family 7 is released into the air through the condenser 2 and the fan 5 of the compressor refrigeration unit, and the heat emitted by PCS11 is released into the air through the heat dissipation water tank 15 and the fan 5, wherein the condenser 2 and the heat dissipation water tank 15 share the same fan 5; Step 5: When the ambient temperature T≤5℃, battery family 7 and PCS11 have cooling requirements, refer to Figure 4 As shown, the control module 23 controls the compressor refrigeration unit to not start the refrigeration work, the compressor 1 is not turned on, the electronic expansion valve 3 is not actuated, the first water pump 9 of the battery liquid cooling unit is turned on, the PTC heater 6 is not turned on, the three-way water valve 14 in the PCS liquid cooling unit is in the middle opening, that is, a, b, and c are all connected, the fan 5 is turned on, and the second water pump 13 is not turned on, the heat emitted by the battery is taken away through the heat exchanger 10, and the heat is released into the air through the heat dissipation water tank 15 and the fan 5 on the PCS 11 side; Step 6: When battery group 7 has no cooling and heating requirements, and PCS has no cooling and heating requirements, refer to Figure 5 As shown, at this time, the compressor refrigeration unit is not turned on, the first water pump 9 of the battery liquid cooling unit is turned on, and the PTC heater 6 is not turned on, maintaining the uniform temperature mode; the second water pump 13 in the PCS liquid cooling unit works at the lowest speed, and the fan 5 is not turned on.

[0031] Step 7: The battery cell temperature has a heating demand, and the PCS has no cooling or heating demand. At this time, the compressor refrigeration unit does not start the refrigeration work, the first water pump 9 of the battery liquid cooling unit is turned on, the PTC heater 6 is turned on, and the three-way water valve 14 in the PCS liquid cooling unit is switched to connect the a and c ends. The second water pump 13 runs at the lowest speed, and the fan 5 is not turned on. At this time, the heat demand of the battery is provided by the PTC heater 6 of the battery liquid cooling unit.

[0032] Step 8: When the battery cell temperature has no cooling or heating requirements, the PCS has cooling requirements, and the ambient temperature T>40°C, the compressor refrigeration unit starts cooling, the first water pump of the battery liquid cooling unit is turned on, the PTC heater is not turned on, and the three-way water valve in the PCS liquid cooling unit is switched to the first circuit, that is, the three-way valve is switched to connect ends a and b, the second water pump is turned on, and the fan is turned on. At this time, the heat emitted by the PCS is released into the air through the condenser and the fan.

[0033] Step 9: When the battery cell temperature has no cooling or heating requirements, the PCS has cooling requirements, and the ambient temperature T≤40℃, refer to Figure 6 As shown, at this time, the compressor refrigeration unit does not start cooling work, the first water pump of the battery liquid cooling unit is turned on, the PTC heater is not turned on, and the three-way water valve in the PCS liquid cooling unit is switched to the second circuit, that is, the three-way valve is switched to connect the a and c ends, the second water pump is turned on, and the fan is turned on. At this time, the battery liquid cooling unit is in a uniform temperature mode, and the heat dissipated by the PCS is released into the air through the heat sink and the fan.

[0034] Step 10: When the battery cell temperature has a cooling demand, the PCS has no cooling or heating demand, and the ambient temperature T>5°C, the compressor refrigeration unit starts working, the first water pump is turned on, the PTC heater is not turned on, and the three-way water valve in the PCS liquid cooling unit is switched to the second branch, that is, the three-way water valve is switched to connect ends a and c, the second water pump runs at the lowest speed, and the fan is turned on, and the heat emitted by the battery group is released into the air through the condenser and fan in the compressor refrigeration unit; Step 11: When the battery cell temperature has a cooling demand, the PCS has no cooling or heating demand, and the ambient temperature T≤5℃, the compressor refrigeration unit does not start working, the first water pump is controlled to start, the PTC heater is not turned on, and the three-way water valve in the PCS liquid cooling unit is switched to the second branch, that is, the three-way water valve is switched to connect the a and c terminals, the second water pump is turned on, and the fan is turned on to release the heat emitted by the battery family into the air through the cooling water tank and the fan.

[0035] The present invention improves the existing PCS air cooling technology and dissipates heat for the PCS by means of liquid cooling, which can effectively solve the problem that the external wind and sand affect the life and performance of the PCS due to the PCS air cooling. By integrating the liquid cooling of the battery and the liquid cooling of the PCS into a set of liquid cooling system, the different water temperature requirements of the battery liquid cooling and the PCS liquid cooling can be met at the same time, saving installation space and reducing equipment and costs.

[0036] Since the inlet water temperature of the liquid cooling requirement on the PCS side during operation is ≤50°C. In the present invention, when the ambient temperature is greater than 40°C, the heat on the PCS side is taken out by the heat exchanger 10 and discharged to the environment by the condenser 2 and the fan 5 of the compressor refrigeration unit; when the ambient temperature is 5°C < ambient temperature ≤ 40°C, the heat on the PCS side is dissipated to the environment by the heat dissipation fan through the heat dissipation water tank 15; when the ambient temperature is ≤5°C, the heat on the PCS side and the heat on the battery side are both dissipated to the environment by the heat dissipation fan through the heat dissipation water tank 15, which can better save energy. The liquid cooling unit of the PCS has different heat dissipation methods at different ambient temperatures. The liquid cooling of the PCS is divided into two branches through a three-way valve. When the ambient temperature is lower than a certain temperature, it is switched to the second branch, and the heat dissipation water tank is turned on to dissipate the heat directly without dissipating the heat through the compression refrigeration unit, which greatly saves energy consumption, improves the system energy consumption ratio, and saves operating costs.

[0037] At present, battery cooling is all done through compressor refrigeration units. In the present invention, when the ambient temperature is ≤5°C, the heat of the battery is taken out through the heat exchanger, and the heat is dissipated to the environment through the heat dissipation water tank by the fan, thereby realizing the function of natural cooling; when the ambient temperature is >5°C, a compressor refrigeration unit is used for cooling to achieve energy-saving effects.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A new type of energy storage battery and PCS dual-path liquid cooling thermal management system, characterized by: It includes a compressor cooling unit, a battery liquid cooling unit, a PCS liquid cooling unit, a sensor assembly, a battery pack (7), a PCS (11) and a control module (23); The control module (23) is respectively connected to the compressor refrigeration unit, the battery liquid cooling unit, the PCS liquid cooling unit, and is electrically connected to the sensor component, and is used to collect real-time data of the sensor component to achieve precise control of the compressor refrigeration unit, the battery liquid cooling unit, and the PCS liquid cooling unit; The battery liquid cooling unit is connected to the battery cluster (7) and is used to perform heat exchange on the battery cluster (7); The PCS liquid cooling unit is connected to the PCS (11) and is used to perform heat exchange on the PCS (11); The compressor refrigeration unit and the battery liquid cooling unit are connected in parallel via a battery cooler (4), and the battery liquid cooling unit and the PCS liquid cooling unit are connected in parallel via a heat exchanger (10). The compressor refrigeration unit is used to provide cooling to the battery liquid cooling unit and the PCS liquid cooling unit.

2. The novel energy storage battery and PCS dual-path liquid cooling thermal management system according to claim 1 is characterized in that: The battery liquid cooling unit comprises a battery cooler (4), a PTC heater (6), a battery pack (7), a first water pump (9) and a heat exchanger (10). The first outlet end of the battery cooler (4) is connected to the inlet end of the PTC heater (6) through a pipeline, the outlet end of the PTC heater (6) is connected to the inlet end of the battery cluster (7) through a pipeline, the outlet end of the battery cluster (7) is connected to the inlet end of the first water pump (9) through a pipeline, the outlet end of the first water pump (9) is connected to the first inlet end of the heat exchanger (10) through a pipeline, and the first outlet end of the heat exchanger (10) is connected to the first inlet end of the battery cooler (4) through a pipeline.

3. The novel energy storage battery and PCS dual-path liquid cooling thermal management system according to claim 2 is characterized in that: The PCS liquid cooling unit comprises a PCS (11), a second water pump (13), a three-way water valve (14), a first branch and a second branch; The first branch comprises a heat exchanger (10) connected in parallel with the battery liquid cooling unit, The second branch includes a heat dissipation water tank (15) and a fan (5) shared with the compressor refrigeration unit. The outlet end of the PCS (11) is connected to the inlet end of the second water pump (13) through a pipeline, and the outlet end of the second water pump (13) is connected to the inlet end a of the three-way water valve (14) through a pipeline. The first outlet end b of the three-way water valve (14) is connected to the inlet end of the first branch through a pipeline, and the second outlet end c of the three-way water valve (14) is connected to the inlet end of the second branch through a pipeline. The outlet ends of the first branch and the second branch are connected to the inlet end of the PCS (11) after merging.

4. The novel energy storage battery and PCS dual-path liquid cooling thermal management system according to claim 3 is characterized in that: The compressor refrigeration unit comprises a compressor (1), a condenser (2), an electronic expansion valve (3), a battery cooler (4) and a fan (5). The outlet end of the compressor (1) is connected to the inlet end of the condenser (2) via a pipeline, the outlet end of the condenser (2) is connected to the second inlet end of the battery cooler (4) via a pipeline, the electronic expansion valve (3) is installed on the pipeline between the outlet end of the condenser (2) and the second inlet end of the battery cooler (4), the second outlet end of the battery cooler (4) is connected to the inlet end of the compressor (1) via a pipeline, The fan (5) is used to accelerate the air flow of the condenser (2) to dissipate heat. The fan (5) is a fan shared with the heat dissipation water tank (15) of the second branch in the PCS liquid cooling unit.

5. The novel energy storage battery and PCS dual-path liquid cooling thermal management system according to claim 4 is characterized in that: The sensing unit comprises a first temperature and pressure sensor (16), a second temperature and pressure sensor (17), a third temperature and pressure sensor (18), a fourth temperature and pressure sensor (19), a fifth temperature and pressure sensor (20), a sixth temperature and pressure sensor (21) and a first temperature sensor (22). The first temperature and pressure sensor (16) is installed on the inlet pipe of the compressor (1) and is used to detect the inlet temperature and pressure of the compressor (1); The second temperature and pressure sensor (17) is installed on the outlet pipe of the compressor (1) and is used to detect the outlet temperature and pressure of the compressor (1); The third temperature and pressure sensor (18) is installed on the inlet pipe of the battery group (7) and is used to detect the temperature and pressure of the liquid supply inlet of the battery group (7); The fourth temperature and pressure sensor (19) is installed on the outlet pipe of the battery group (7) and is used to detect the temperature and pressure of the liquid supply outlet of the battery group (7); The fifth temperature and pressure sensor (20) is installed on the inlet pipe of the PCS (11) and is used to detect the temperature and pressure of the liquid supply inlet of the PCS (11); The sixth temperature and pressure sensor (21) is installed on the outlet pipe of the PCS (11) and is used to detect the temperature and pressure of the liquid supply outlet of the PCS (11); The first temperature sensor (22) is arranged at the dual-path liquid cooling thermal management system and is used to detect the ambient temperature of the dual-path liquid cooling thermal management system; The control module (23) is electrically connected to the first temperature and pressure sensor (16), the second temperature and pressure sensor (17), the third temperature and pressure sensor (18), the fourth temperature and pressure sensor (19), the fifth temperature and pressure sensor (20), the sixth temperature and pressure sensor (21), and the first temperature sensor (22), and is used to collect and process real-time data of the sensor component.

6. A novel energy storage battery and PCS dual-path liquid cooling thermal management system control method, using the novel energy storage battery and PCS dual-path liquid cooling thermal management system as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: A thermal management control strategy is built into the control module (23), and a critical operating temperature value Ta of the thermal management control is set, where Ta is a critical ambient temperature value at which the PCS11 can achieve heat dissipation through the heat dissipation water tank (15), and Tb is a critical temperature value at which the battery family can achieve heat dissipation through the heat dissipation water tank (15); Step 2: The control module (23) collects and acquires real-time sensor data at various locations through the sensor components, wherein the ambient temperature collected by the first temperature sensor (22) is T, and controls and outputs different control strategies according to the ambient temperature T; Step 3: When the battery cells in the battery group (7) and the PCS (11) both have cooling requirements and the ambient temperature T>Ta; the control module (23) controls the compressor cooling unit to start cooling, controls the first water pump (9) to start, and the PTC heater (6) to not start, the three-way water valve (14) in the PCS liquid cooling unit is switched to the first branch, that is, the three-way water valve is switched to connect ends a and b, the second water pump (13) is turned on, and the fan (5) is turned on, so that the heat emitted by the battery group (7) and the PCS (11) is uniformly released into the air through the condenser (2) and the fan (5) in the compressor cooling unit; Step 4: When both the battery group (7) and the PCS (11) have cooling requirements and Tb < ambient temperature T ≤ Ta; the PCS (11) can dissipate heat through the heat dissipation water tank (15), the control module (23) controls the compressor refrigeration unit to start refrigeration, the first water pump (9) is turned on, the PTC heater (6) is not turned on, the three-way water valve (14) in the PCS liquid cooling unit is switched to the second branch, that is, the three-way valve is switched to connect ends a and c, the second water pump (13) is turned on, and the fan (5) is turned on; the heat dissipated by the battery group (7) is released into the air through the condenser (2) and fan (5) of the compressor refrigeration unit, and the heat dissipated by the PCS (11) is released into the air through the heat dissipation water tank 15 and fan (5), wherein the condenser (2) and the heat dissipation water tank 15 share the same fan (5); Step 5: When the battery group (7) and the PCS (11) have a cooling demand and the ambient temperature T≤Tb, the control module (23) controls the compressor cooling unit not to start cooling work, the compressor (1) is not turned on, the electronic expansion valve (3) is not actuated, the first water pump (9) of the battery liquid cooling unit is turned on, the PTC heater (6) is not turned on, the three-way water valve (14) in the PCS liquid cooling unit is at an intermediate opening, that is, a, b, and c are all connected, the fan (5) is turned on, the second water pump (13) is turned on, the heat emitted by the battery is taken away through the heat exchanger (10), and the heat is released into the air through the PCS (11) side heat dissipation water tank (15) and the fan (5); Step 6: When the battery group (7) has no cooling and heating requirements and the PCS has no cooling and heating requirements, the compressor cooling unit is not turned on, the first water pump (9) of the battery liquid cooling unit is turned on, and the PTC heater (6) is not turned on, and the temperature is kept in the uniform temperature mode; the second water pump (13) of the PCS liquid cooling unit works at the lowest speed, and the fan (5) is not turned on; Step 7: When the battery cell temperature has a heating demand and the PCS has no cooling or heating demand, the compressor cooling unit does not start cooling work, the first water pump (9) of the battery liquid cooling unit is turned on, the PTC heater (6) is turned on, and the three-way water valve (14) in the PCS liquid cooling unit is switched to the second circuit, that is, the three-way valve is switched to connect the a and c terminals, the second water pump (13) runs at the lowest speed, and the fan (5) is not turned on. At this time, the PTC heater (6) of the battery liquid cooling unit provides the heat demand to the battery; Step 8: When the battery cell temperature has no cooling or heating requirements, the PCS has cooling requirements, and the ambient temperature T>Ta, the compressor cooling unit starts cooling, the first water pump (9) of the battery liquid cooling unit is turned on, the PTC heater (6) is not turned on, the three-way water valve (14) in the PCS liquid cooling unit is switched to the first circuit, that is, the three-way valve is switched to connect ends a and b, the second water pump (13) is turned on, and the fan (5) is turned on. At this time, the heat emitted by the PCS (11) is released into the air through the condenser 2 and the fan (5); Step 9: When the battery cell temperature has no cooling or heating requirements, the PCS has cooling requirements, and the ambient temperature T≤Ta, the compressor cooling unit does not start cooling, the first water pump (9) of the battery liquid cooling unit is turned on, the PTC heater (6) is not turned on, the three-way water valve (14) in the PCS liquid cooling unit is switched to the second circuit, that is, the three-way valve is switched to connect ends a and c, the second water pump (13) is turned on, and the fan (5) is turned on. At this time, the battery liquid cooling unit is in a temperature equalization mode, and the heat dissipated by the PCS (11) is released into the air through the heat dissipation water tank 15 and the fan (5); Step 10: When the battery cell temperature has a cooling demand, the PCS has no cooling or heating demand, and the ambient temperature T>Tb, the control module (23) controls the compressor cooling unit to start cooling, controls the first water pump (9) to start, and the PTC heater (6) to not start, the three-way water valve (14) in the PCS liquid cooling unit is switched to the second branch, that is, the three-way water valve is switched to connect ends a and c, the second water pump (13) runs at the lowest speed, and the fan (5) is turned on, so that the heat emitted by the battery group (7) is released into the air through the condenser (2) and the fan (5) in the compressor cooling unit; Step 11: When the battery cell temperature has a cooling demand, the PCS has no cooling or heating demand, and the ambient temperature T≤Tb, the control module (23) controls the compressor cooling unit not to start working, controls the first water pump (9) to start, and the PTC heater (6) not to start, and the three-way water valve (14) in the PCS liquid cooling unit is switched to the second branch, that is, the three-way water valve is switched to connect the a and c ends, the second water pump (13) is turned on, and the fan (5) is turned on, so that the heat emitted by the battery group (7) is released into the air through the heat dissipation water tank (15) and the fan (5).

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