An external battery temperature control system and method

Abstract

The application discloses an external battery temperature control system and method, and relates to the technical field of new energy vehicles.The system comprises a control module, which is used for collecting real-time temperatures and real-time powers of a plurality of power batteries during charging, and processing the real-time temperatures and the real-time powers to obtain target temperatures of the power batteries respectively; the control module is also used for controlling real-time flow rates of cooling liquids delivered to the power batteries by a heating module and a cooling module respectively. The heating module is used for heating the cooling liquids output by the power batteries, and the cooling liquids meeting the target temperatures are delivered back to the power batteries. The cooling module is used for adjusting the temperatures of the cooling liquids output by the power batteries, and the cooling liquids meeting the target temperatures are delivered back to the power batteries. The application can simultaneously control the temperatures of the plurality of power batteries through the external temperature control system, reduces the design difficulty of the vehicle and the occupation of the space in the vehicle, and improves the control efficiency and the control accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicles, in particular to an external battery temperature control system and method. BACKGROUND

[0002] The new energy vehicle power battery as the power source of the vehicle, the heat generated by its charging and discharging will always exist. The performance of the power battery is closely related to the battery temperature. In order to prolong the service life of the power battery as much as possible and obtain the maximum power, the storage battery needs to be used within a specified temperature range. In principle, within the range of -40℃ to +55℃, the actual battery temperature of the power battery unit is in a runnable state. Therefore, the current power battery unit of the new energy vehicle is equipped with a cooling device. The power battery cooling system has air conditioning circulation cooling type, water cooling type and air cooling type.

[0003] Taking the air conditioning circulation cooling type as an example, in high-end electric vehicles, the power battery has a refrigerant circulation loop connected with the air conditioning system. The power battery unit is directly cooled by the cooling liquid, and the cooling liquid circulation loop is connected with the refrigerant circulation loop through a cooling liquid refrigerant heat exchanger, i.e. a cooling unit. Therefore, the refrigerant circulation loop of the air conditioning system is composed of two parallel branches. One is used to cool the vehicle interior space, and the other is used to cool the power battery unit. An electric cooling liquid pump transports the cooling liquid through the cooling liquid circulation loop. As long as the temperature of the cooling liquid is lower than that of the battery module, the battery module can be cooled only by the circulation flow of the cooling liquid. The temperature of the cooling liquid rises, which is not enough to keep the temperature of the battery module within the expected range. Therefore, the temperature of the cooling liquid must be reduced, and the cooling liquid refrigerant heat exchanger, i.e. the cooling unit, is needed.

[0004] With the development of new energy vehicle power batteries, the development of high-density, high-power and fast-charging new energy vehicles is encouraged. In the current such vehicles, in order to ensure that the power battery operates within a suitable temperature range, during charging and discharging, the vehicle often needs to match the above-mentioned high-power temperature control unit. Since the power battery has greater heat dissipation demand in the charging condition than in the discharging condition, the battery system needs to have great heat dissipation capacity to meet higher charging rates. The shortcomings of the existing high-power temperature control unit are increasingly obvious, for example, in normal driving and operating scenarios, the high-power temperature control unit does not need to work at the maximum cooling efficiency, so the power of the vehicle-mounted high-power temperature control unit is in a state of overflow most of the time. In addition, the current high-power temperature control unit has a complex structure, which affects the arrangement of the vehicle, is not conducive to the weight reduction of the vehicle, and greatly increases the design and manufacturing costs of the vehicle. If the existing high-power temperature control unit is continued to be used on new energy vehicles to regulate and control the temperature of the power battery, as the fast-charging demand of the power battery becomes higher and higher, the huge heat dissipation demand brought by short-time charging will inevitably lead to the design of a larger, heavier and higher-power temperature control unit by the vehicle designers to ensure the safe charging. SUMMARY

[0005] In view of the defects in the prior art, the purpose of the present application is to provide an external battery temperature control system and method, which can simultaneously control the temperature of multiple power batteries through an external temperature control system, reduce the design difficulty of the vehicle and the occupation of the vehicle space, and improve the control efficiency and accuracy by controlling the flow of the cooling liquid returned to the power battery.

[0006] To achieve the above purpose, the technical solution adopted is:

[0007] The first aspect of the present application provides an external battery temperature control system, which comprises:

[0008] a heating module connected to a main circuit connected to multiple power batteries, for heating the cooling liquid output by the multiple power batteries to obtain cooling liquid meeting a target temperature, and then delivering the cooling liquid back to the power batteries;

[0009] a cooling module connected to a main circuit connected to the multiple power batteries, comprising a cooling pool containing cooling liquid, for adjusting the temperature of the cooling liquid output by the multiple power batteries to obtain cooling liquid meeting a target temperature, and then delivering the cooling liquid back to the power batteries;

[0010] a control module for collecting the real-time temperature and real-time power of the multiple power batteries during charging, and processing them respectively to obtain the target temperature of each power battery; the control module is also used for controlling the real-time flow of the cooling liquid delivered to each power battery by the heating module and the cooling module.

[0011] In some embodiments, the control module comprises:

[0012] a plurality of branch controllers for collecting the real-time temperature and the real-time power of each power battery respectively; also for collecting the temperature and flow of the cooling liquid output by each power battery and the temperature and flow of the cooling liquid input to each power battery respectively, and sending the collected temperature and flow data to a total controller; also for controlling the flow of the cooling liquid input to each power battery according to the flow control instruction of the total controller; the branch controllers correspond one-to-one to the power batteries;

[0013] a total controller for processing the target control temperature of each power battery according to the real-time temperature and the real-time power sent by each branch controller, and performing mean value processing according to the target control temperature of all power batteries to obtain the target temperature; also for obtaining the flow control instruction according to the target temperature and combining the real-time temperature and the real-time power of each power battery;

[0014] The branch controllers control the flow of the coolant to the power battery through the flow control water pump.

[0015] In some embodiments, the plurality of branch controllers and the total controller are integrated in the same hardware.

[0016] In some embodiments, the power battery is provided with a vehicle end water outlet joint for outputting the coolant and a vehicle end water inlet joint for receiving the coolant, and the control module is provided with a temperature control end water outlet joint for outputting the coolant and a temperature control end water inlet joint for receiving the coolant.

[0017] The vehicle end water outlet joint is communicated with the vehicle-mounted cooling unit through a water outlet pipeline, and the water outlet pipeline is provided with a first quick plug, and the temperature control end water inlet joint is detachably connected to the first quick plug when the vehicle is charging.

[0018] The vehicle end water inlet joint is communicated with the vehicle-mounted cooling unit through a water inlet pipeline, and the water inlet pipeline is provided with a second quick plug, and the temperature control end water outlet joint is detachably connected to the second quick plug when the vehicle is charging.

[0019] In some embodiments, the cooling pool is provided with a heat preservation and heat dissipation system for controlling the temperature of the coolant contained therein.

[0020] In some embodiments, the system further comprises:

[0021] An auxiliary refrigeration module for cooling the coolant flowing out of the power battery or the coolant flowing out of the cooling module.

[0022] In some embodiments, the external battery temperature control system further comprises:

[0023] A first control water valve connected to the control module, the heating module, and the cooling module, respectively, for controlling the flow direction of the coolant flowing out of all the power batteries to the heating module or the cooling module according to the flow direction control instruction of the control module.

[0024] A second control water valve connected to the control module and the cooling module, respectively, for controlling the flow direction of part of the coolant flowing out of the first control water valve to the cooling pool and controlling the mixing of another part of the coolant flowing out of the first control water valve with the coolant flowing out of the cooling pool according to the flow direction control instruction of the control module.

[0025] A sub-control module connected to the control module, the cooling module, the heating module, and the auxiliary refrigeration module, respectively, for controlling the opening and closing of the heating module and the auxiliary refrigeration module in the process of the coolant flowing out of the second control water valve flowing through the heating module, the auxiliary refrigeration module, and the power battery in sequence according to the flow direction control instruction of the control module.

[0026] The first control water valve and the second control water valve can be integrated into one water valve.

[0027] In some embodiments, when the control module determines that the target temperature is higher than the water temperature of the main circuit and the coolant temperature in the cooling pool is higher than the water temperature of the main circuit, if the coolant temperature in the cooling pool is higher than the target temperature, the control module controls all the coolant flowing out of the power battery to flow to the cooling module through the first control water valve, controls the percentage of the coolant flowing into the cooling pool through the second control water valve, and controls the mixed coolant to be further heated when flowing through the heating module to obtain the coolant meeting the target temperature through the sub-control module; if the coolant temperature in the cooling pool is lower than the target temperature, the control module controls all the coolant flowing out of the power battery to flow to the cooling module through the first control water valve, controls the percentage of the coolant flowing into the cooling pool through the second control water valve, and controls the mixed coolant to be further heated when flowing through the heating module to obtain the coolant meeting the target temperature through the sub-control module.

[0028] When the control module determines that the target temperature is higher than the water temperature of the main circuit and the coolant temperature in the cooling pool is lower than the water temperature of the main circuit, the control module controls all the coolant flowing out of the power battery to flow to the heating module through the first control water valve to obtain the coolant meeting the target temperature.

[0029] All the coolant output by the power batteries is aggregated to the main circuit and then delivered to the control module for judgment.

[0030] After obtaining the coolant meeting the target temperature, the coolant is delivered back to the power batteries.

[0031] In some embodiments, when the control module determines that the target temperature is lower than the water temperature of the main circuit and the coolant temperature in the cooling pool is higher than the water temperature of the main circuit, the control module controls all the coolant flowing out of the power battery to flow to the auxiliary refrigeration module through the first control water valve to obtain the coolant meeting the target temperature.

[0032] When the control module determines that the target temperature is lower than the water temperature of the main circuit and the coolant temperature in the cooling pool is lower than the water temperature of the main circuit, if the coolant temperature in the cooling pool is higher than the target temperature, the control module controls all the coolant flowing out of the power battery to flow to the cooling module through the first control water valve and the second control water valve, and controls the coolant flowing out of the cooling module to be further cooled when flowing through the auxiliary refrigeration module to obtain the coolant meeting the target temperature through the sub-control module; if the coolant temperature in the cooling pool is lower than the target temperature, the control module controls all the coolant flowing out of the power battery to flow to the cooling module through the first control water valve, controls the percentage of the coolant flowing into the cooling pool through the second control water valve, and controls the mixed coolant to be further heated when flowing through the heating module to obtain the coolant meeting the target temperature through the sub-control module.

[0033] All the coolant output by the power batteries is aggregated to the main circuit and then delivered to the control module for judgment.

[0034] After the cooling liquid meeting the target temperature is obtained, the cooling liquid is transported back to the power battery.

[0035] An external battery temperature control method based on the external battery temperature control system of any one of the above, the method comprising:

[0036] Collecting the real-time temperature and real-time power of the plurality of power batteries during charging, and processing them respectively to obtain the target temperature of each power battery;

[0037] The cooling liquid output by the plurality of power batteries is temperature-regulated, and after the cooling liquid meeting the target temperature is obtained, the cooling liquid is transported back to the power battery, and the real-time flow of the cooling liquid transported to each power battery is controlled.

[0038] The technical solutions provided by the present application have the following beneficial effects:

[0039] By designing an external battery temperature control system, the design difficulty of the vehicle and the occupation of the space in the vehicle can be reduced, and the design and manufacturing costs of the vehicle can be reduced.

[0040] After the cooling liquid output by each power battery is uniformly temperature-regulated by the heating module or the cooling module, the temperature control efficiency of each power battery is further controlled by controlling the backflow of the cooling liquid transported back to each power battery, the temperature of the plurality of power batteries of the new energy vehicle can be controlled during charging, and the temperature control efficiency and the temperature control accuracy are improved.

[0041] By adding an auxiliary refrigeration module, when the cooling efficiency of the cooling module cannot meet the demand, the cooling efficiency is further improved to meet the demand of the vehicle under extreme working conditions, and the safety of the vehicle charging is further improved.

[0042] When the power battery needs to be heated, all the cooling liquid flowing out of the power battery is controlled to flow to the heating module to be heated, and then flows back to the power battery to heat the power battery, or the cooling liquid flowing out of the power battery is heated by the cooling liquid in the cooling pool which has a higher temperature than the real-time temperature of the power battery, and then it is determined whether further heating is needed according to the demand. When the power battery needs to be cooled by a small amplitude, all the cooling liquid flowing out of the power battery is controlled to flow to the cooling module, and part of it is controlled to flow into the cooling pool and part of it is not controlled to flow into the cooling pool, then the cooling liquid with a small amplitude of cooling is obtained by mixing the two, and the cooling liquid is made to flow back to the power battery to cool the power battery. When the power battery needs to be cooled by a large amplitude, all the cooling liquid flowing out of the power battery is controlled to flow to the cooling module, and all the cooling liquid is controlled to flow into the cooling pool, then the cooling liquid with a large amplitude of cooling flowing out of the cooling pool is made to flow back to the power battery to cool the power battery. When the power battery needs to be cooled by a great amplitude, all the cooling liquid flowing out of the power battery is controlled to flow to the cooling pool and the auxiliary cooling module in turn, and the cooling liquid with a great amplitude of cooling is made to flow back to the power battery to cool the power battery. The temperature control strategy can be flexibly adjusted according to different working conditions, and the temperature control pertinence and efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 It is an application schematic diagram of the external battery temperature control system in the embodiment of the application.

[0044] Figure 2 It is an installation schematic diagram of the external battery temperature control system in the embodiment of the application. BRIEF DESCRIPTION OF DRAWINGS:

[0046] 1-power battery; 2-external battery temperature control system; 3-vehicle end water inlet joint; 4-vehicle end water outlet joint; 5-temperature control end water inlet joint; 6-temperature control end water outlet joint; 7-first quick connector; 8-second quick connector; 9-branch controller; 10-total controller; 11-heating module; 12-cooling module; 13-auxiliary cooling module; 14-flow control water pump; 15-first control water valve; 16-second control water valve; 17-sub control module; 18-vehicle-mounted cooling unit. DETAILED DESCRIPTION

[0047] The application will be further described in detail below in combination with the drawings and embodiments.

[0048] As Figure 1As shown, the embodiment of the present application provides an external battery temperature control system 2, which comprises a control module, the control module is connected with a heating module 11 and a cooling module 12, the control module, the heating module 11 and the cooling module 12 are all connected with the power battery 1, the control module is mainly used for collecting data signals of the power battery 1 and controlling the working of the heating module 11 and the cooling module 12, the heating module 11 is mainly used for heating the cooling liquid temperature of the power battery 1, and the cooling module 12 is mainly used for cooling the power battery 1. The control module is also used for controlling the real-time flow of the cooling liquid delivered by the heating module 11 and the cooling module 12 to each power battery 1.

[0049] In the embodiment, the external temperature control system can be used to simultaneously control multiple power batteries 1, thereby reducing the design difficulty of the vehicle and the occupation of the vehicle space, and improving the control efficiency and accuracy.

[0050] In a specific embodiment, the control module is used to collect the real-time temperature and real-time power of the multiple power batteries 1 during charging and process them respectively to obtain the target temperature of each power battery 1; and the control module is also used for controlling the real-time flow of the cooling liquid delivered by the heating module 11 and the cooling module 12 to each power battery 1.

[0051] The main circuit connected with the heating module 11 connects the multiple power batteries 1, is used for heating the cooling liquid output by the multiple power batteries 1, obtains the cooling liquid meeting the target temperature, and then delivers the cooling liquid back to the power battery 1.

[0052] The main circuit connected with the cooling module 12 connects the multiple power batteries 1, comprises a cooling pool containing cooling liquid, is used for cooling the cooling liquid output by the multiple power batteries 1, obtains the cooling liquid meeting the target temperature, and then delivers the cooling liquid back to the power battery 1.

[0053] After the cooling liquid output by all the power batteries 1 is collected into the main circuit, the control module collects the water temperature of the main circuit and makes subsequent judgments.

[0054] In the embodiment, by designing the external battery temperature control system, the design difficulty of the vehicle and the occupation of the vehicle space can be reduced, and the design and manufacturing costs of the vehicle can be reduced.

[0055] After the cooling liquid output by each power battery 1 is uniformly temperature-regulated by the heating module 11 and the cooling module 12, the return flow of the cooling liquid delivered back to each power battery 1 is further controlled, the temperature control efficiency of each power battery 1 is controlled, multiple power batteries 1 of a new energy vehicle can be simultaneously temperature-controlled during charging, and the temperature control efficiency and accuracy are improved.

[0056] Further, the power battery 1 is provided with a BMS (Battery Management System), and the real-time temperature and heat dissipation requirement of the power battery 1 during charging are provided by the BMS.

[0057] The power battery 1 is the most important component on the electric vehicle, and its position in the whole vehicle is equivalent to the position of the engine in the traditional vehicle. Such an important component must be managed. However, due to the properties of the battery, the BMS supervises and serves the battery, and tries every means to prevent the battery from malfunctioning.

[0058] In a preferred embodiment, the control module comprises a general controller 10 connected with a plurality of branch controllers 9 and a flow control water pump 14.

[0059] The plurality of branch controllers 9 are used to collect the real-time temperature and the real-time power of each power battery 1 respectively. They are also used to collect the temperature and flow of the cooling liquid output by each power battery 1 and the temperature and flow of the cooling liquid input to each power battery 1, and send the collected temperature and flow data to the general controller 10. They are also used to control the flow of the cooling liquid input to each power battery 1 according to the flow control instruction of the general controller 10. The branch controller 9 corresponds to the power battery 1 one by one.

[0060] The general controller 10 is used to obtain the target control temperature of each power battery 1 according to the real-time temperature and the real-time power sent by each branch controller 9, and to obtain the target temperature by averaging the target control temperatures of all power batteries 1. It is also used to obtain the flow control instruction according to the target temperature and the real-time temperature and the real-time power of each power battery 1. Specifically, the general controller 10 can also obtain the target temperature according to the target control temperatures of all power batteries 1 by using other strategies. In general, the general controller 10 selects the target temperature based on the principle of best economy.

[0061] The branch controller 9 controls the flow of the cooling liquid input to the power battery 1 through the flow control water pump 14.

[0062] Further, the plurality of branch controllers 9 and the general controller 10 are integrated in the same hardware. Specifically, when the computing capacity of the general controller 10 is sufficient, the branch controller 9 can not be involved, and the temperature control of each power battery 1 can be realized only by the general controller 10.

[0063] In the embodiment, the cooling liquid output by each power battery 1 is uniformly temperature-regulated by the heating module 11 and the cooling module 12, and then the temperature control efficiency of each power battery 1 is controlled by controlling the return flow rate of the cooling liquid returned to each power battery 1, so that the power batteries 1 of multiple vehicles can be simultaneously temperature-controlled when the new energy vehicles are charging, and the temperature control efficiency and the temperature control accuracy are improved.

[0064] In a preferred embodiment, as shown in the drawings, Figure 2 As shown in the drawings, the power battery 1 is provided with a vehicle end water outlet joint 4 for outputting cooling liquid and a vehicle end water inlet joint 3 for receiving cooling liquid, and the control module is provided with a temperature control end water outlet joint 6 for outputting cooling liquid and a temperature control end water inlet joint 5 for receiving cooling liquid.

[0065] The vehicle end water outlet joint 4 is communicated with the vehicle-mounted cooling unit 18 through a water outlet pipeline, and the water outlet pipeline is provided with a first quick connector 7, and the temperature control end water inlet joint 5 is detachably connected to the first quick connector 7 when the vehicle is charging.

[0066] The vehicle end water inlet joint 3 is communicated with the vehicle-mounted cooling unit 18 through a water inlet pipeline, and the water inlet pipeline is provided with a second quick connector 8, and the temperature control end water outlet joint 6 is detachably connected to the second quick connector 8 when the vehicle is charging.

[0067] In the embodiment, the vehicle-mounted cooling unit 18 is generally included in a TMS (Thermal Management System).

[0068] By arranging the plurality of quick connectors on the water inlet and outlet pipelines of the existing power battery 1 and the vehicle-mounted cooling unit 18, when the vehicle is not charging, the power battery 1 is not connected to the external battery temperature control system 2, but the temperature of the power battery 1 is still controlled by the vehicle-mounted cooling unit 18. When the vehicle is charging, the external battery temperature control system 2 is plugged into the plurality of quick connectors, and the temperature of the power battery 1 during rapid charging is controlled by the external battery temperature control system 2. There is no need to design and install a large-power cooling device on the vehicle, which reduces the design and manufacturing costs of the vehicle, reduces the occupation of the space in the vehicle, and can perform targeted temperature control on the power battery 1 of each vehicle according to the charging efficiency of each charging pile, which has a wider application range and is more flexible to use.

[0069] In a preferred embodiment, the cooling pool is provided with a heat preservation and heat dissipation system for controlling the temperature of the cooling liquid accommodated therein.

[0070] In the embodiment, the cooling pool contains large volume of cooling liquid, which is used to provide cooling liquid for the power battery 1 and collect high temperature cooling liquid flowing from the power battery 1. Since the cooling liquid in the cooling pool has large volume and is provided with self-insulation and heat dissipation system, the cooling liquid flowing from the power battery 1 has little effect on the temperature of the cooling liquid in the cooling pool, so that the temperature of the cooling liquid flowing from the cooling pool can be kept relatively constant.

[0071] In the preferred embodiment, the system further comprises an auxiliary refrigeration module 13 for further cooling the cooling liquid flowing from the cooling module 12. The auxiliary refrigeration module 13 can be integrated with the temperature adjustment module 11 in the same hardware or can be separately arranged.

[0072] In the embodiment, by adding the auxiliary refrigeration module 13, the cooling efficiency is further improved when the cooling efficiency of the cooling module 12 cannot meet the requirement, so that the requirement of the vehicle under extreme working condition is met and the safety of the vehicle charging is further improved.

[0073] In the preferred embodiment, the external battery temperature control system 2 further comprises a first control water valve 15, a second control water valve 16 and a sub-control module 1.

[0074] The first control water valve 15 is connected with the control module, the heating module 11 and the cooling module 12 respectively, and is used to control the flow direction of the cooling liquid flowing from all the power batteries 1 to the heating module 11 or the cooling module 12 according to the flow direction control instruction of the control module. Specifically, when the power battery 1 needs to be heated, it is determined whether the cooling liquid output by the power battery 1 is directly sent to the heating module 11 for heating or is first sent to the cooling pool for heating according to whether the temperature of the cooling liquid in the cooling pool is higher than the water temperature of the main circuit, i.e. whether the cooling pool can heat the power battery 1, and then it is determined whether the cooling liquid mixed with the hot water of the cooling pool still needs to be further sent to the heating module 11 for further heating according to whether the temperature of the cooling liquid in the cooling pool is higher than the target temperature, i.e. whether the heating capacity of the cooling pool is sufficient, and the above flow splitting is realized based on the first control water valve 15.

[0075] A second control water valve 16 is connected to the control module and the cooling module 12 respectively, for controlling the flow direction of the cooling liquid from the first control water valve 15 to the cooling pool according to the flow direction control instruction of the control module, and controlling another part of the cooling liquid from the first control water valve 15 not to enter the cooling pool, but to mix with the cooling liquid from the cooling pool. Specifically, when the power battery needs to be heated, part of the cooling liquid of the power battery enters the cooling pool for heating, and then the cooling liquid output from the cooling pool is mixed with another part of the cooling liquid of the power battery which does not enter the cooling pool, and the second control water valve 16 adjusts the mixing ratio of the two. Further, when the power battery needs to be cooled at a small amplitude, the cooling liquid in the cooling pool with a temperature lower than the main loop water temperature can be mixed with the cooling liquid of the power battery, and the second control water valve 16 adjusts the mixing ratio of the two. Further, when the cooling liquid of the power battery needs to be cooled at a large amplitude, the cooling liquid of the power battery can be all input into the cooling pool for cooling. The above-mentioned flow splitting is realized based on the second control water valve 16.

[0076] A sub-control module 17 is connected to the control module, the cooling module 12, the heating module 11 and the auxiliary refrigeration module 13 respectively, for controlling the opening and closing of the heating module 11 and the auxiliary refrigeration module 13 in the process of the cooling liquid flowing through the heating module 11, the auxiliary refrigeration module 13 and the power battery 1 in sequence after the cooling liquid output from the second control water valve 16 according to the flow direction control instruction of the control module. Specifically, the cooling liquid output from the cooling pool (including the completely output from the cooling pool and the above-mentioned mixed) subsequently passes through the heating module 11 and the auxiliary refrigeration module 13 in sequence, and is finally delivered back to the power battery 1. In the process of flowing through the heating module 11 and the auxiliary refrigeration module 13, the sub-control module 17 controls whether the heating module 11 works and whether the auxiliary refrigeration module 13 works. When the cooling or heating capacity of the cooling pool is sufficient, the temperature of the cooling liquid output from the cooling pool has already met the target temperature, and then the cooling liquid output from the cooling pool is all delivered back to the power battery, and in this process, the sub-control module 17 controls the heating module 11 and the auxiliary refrigeration module 13 to be closed. When the cooling or heating capacity of the cooling pool is insufficient, the temperature of the cooling liquid output from the cooling pool does not meet the target temperature, and then the cooling liquid output from the cooling pool is further delivered to the heating module 11 for further heating or to the auxiliary refrigeration module 13 for further refrigeration, until the cooling liquid meeting the target temperature is obtained, which is all delivered back to the power battery. In this process, if further heating is needed, the sub-control module 17 starts the heating module 11, and if further cooling is needed, the sub-control module 17 starts the auxiliary refrigeration module 13.

[0077] In the preferred embodiment, when the control module determines that the target temperature is higher than the water temperature of the main circuit and the coolant temperature in the cooling pool is higher than the water temperature of the main circuit, if the coolant temperature in the cooling pool is higher than the target temperature, the control module controls the coolant flowing out of the power battery 1 to flow to the cooling module 12 entirely through the first control water valve 15, controls the percentage of the coolant flowing into the cooling pool through the second control water valve 16, and controls the mixed coolant to reach the target temperature; if the coolant temperature in the cooling pool is lower than the target temperature, the control module controls the coolant flowing out of the power battery 1 to flow to the cooling module 12 entirely through the first control water valve 15, controls the percentage of the coolant flowing into the cooling pool through the second control water valve 16, and controls the mixed coolant to flow to the heating module 11 through the sub-control module 17 for further heating to reach the target temperature.

[0078] When the control module determines that the target temperature is higher than the water temperature of the main circuit and the coolant temperature in the cooling pool is lower than the water temperature of the main circuit, the control module controls the coolant flowing out of the power battery 1 to flow to the heating module 11 entirely through the first control water valve 15 to reach the target temperature.

[0079] After the coolant reaching the target temperature, the coolant is transported back to the power battery 1.

[0080] In the embodiment, the size relationship among the water temperature of the main circuit, the target temperature to which the power battery 1 needs to be adjusted, and the coolant temperature in the cooling pool determines the flow direction of the coolant flowing out of the power battery 1 when the coolant is adjusted in temperature.

[0081] When the target temperature is higher than the water temperature of the main circuit, it means that the power battery 1 needs to be heated. At this time, there are two cases, one is that the coolant temperature in the cooling pool is higher than the water temperature of the main circuit, i.e., the cooling pool has a heating function, and the other is that the coolant temperature in the cooling pool is lower than the water temperature of the main circuit, i.e., the cooling pool does not have a heating function.

[0082] When the cooling pool has a heating function, two cases are further subdivided, one is that the cooling liquid temperature in the cooling pool is higher than the target temperature, that is, the heating function of the cooling pool is sufficient, and the other is that the cooling liquid temperature in the cooling pool is not higher than the target temperature, that is, the heating function of the cooling pool is insufficient. When the cooling pool heating capacity is sufficient, the cooling liquid output from the power battery is controlled to flow to the cooling pool for heating to obtain the cooling liquid meeting the target temperature through the first control water valve 15 and the second control water valve 16, and the cooling liquid meeting the target temperature is controlled to be transported back to the power battery through the sub-control module 17, and the sub-control module 17 controls the heating module 11 and the auxiliary refrigeration module 13 to be closed. When the cooling pool heating capacity is insufficient, the cooling liquid output from the power battery is controlled to flow to the cooling pool for heating, and then the cooling liquid output from the cooling pool is further controlled to flow to the heating module 11 for heating to obtain the cooling liquid meeting the target temperature, and then the cooling liquid meeting the target temperature is controlled to be transported back to the power battery through the sub-control module 17, and the sub-control module 17 controls the heating module 11 to start.

[0083] When the cooling pool does not have a heating function, the cooling liquid output from the power battery is controlled to flow to the heating module 11 for heating to obtain the cooling liquid meeting the target temperature through the first control water valve 15, and then the cooling liquid meeting the target temperature is transported back to the power battery.

[0084] In a preferred embodiment, when the control module judges that the target temperature is lower than the water temperature of the main circuit, and the cooling liquid temperature in the cooling pool is higher than the water temperature of the main circuit, the cooling liquid output from the power battery 1 is controlled to flow to the auxiliary refrigeration module 13 to obtain the cooling liquid meeting the target temperature through the first control water valve 15, and the auxiliary refrigeration module 13 is controlled to be opened by the sub-control module 17.

[0085] When the control module judges that the target temperature is lower than the water temperature of the main circuit, and the cooling liquid temperature in the cooling pool is lower than the water temperature of the main circuit, if the cooling liquid temperature in the cooling pool is higher than the target temperature, the cooling liquid output from the power battery 1 is controlled to flow to the cooling module 12 through the first control water valve 15 and the second control water valve 16, and the cooling liquid output from the cooling module 12 is controlled to be further cooled when flowing through the auxiliary refrigeration module 13 to obtain the cooling liquid meeting the target temperature through the sub-control module 17, and if the cooling liquid temperature in the cooling pool is lower than the target temperature, the cooling liquid output from the power battery 1 is controlled to flow to the cooling module 12 through the first control water valve 15 and the second control water valve 16, and the percentage of the cooling liquid flowing into the cooling pool is controlled to obtain the cooling liquid meeting the target temperature.

[0086] After obtaining the cooling liquid meeting the target temperature, the cooling liquid is transported back to the power battery 1.

[0087] In the embodiment, when the target temperature is lower than the water temperature of the main circuit, it is indicated that the power battery 1 needs to be cooled. At this time, there are two cases. One is that the cooling liquid temperature in the cooling pool is higher than the water temperature of the main circuit, that is, the cooling pool does not have a cooling function. The other is that the cooling liquid temperature in the cooling pool is lower than the water temperature of the main circuit, that is, the cooling pool has a cooling function.

[0088] When the cooling pool does not have a cooling function, the cooling liquid output by the power battery is controlled to flow to the auxiliary cooling module 13 for cooling by the first control water valve 15, and then all the cooling liquid is transported back to the power battery after the cooling liquid meeting the target temperature is obtained. The auxiliary cooling module 13 is controlled to be turned on by the sub-control module 17.

[0089] When the cooling pool has a cooling function, it is further divided into two cases. One is that the cooling liquid temperature in the cooling pool is higher than the target temperature, that is, the cooling capacity of the cooling pool is insufficient. The other is that the cooling liquid temperature in the cooling pool is not higher than the target temperature, that is, the cooling capacity of the cooling pool is sufficient. When the cooling capacity of the cooling pool is insufficient, the cooling liquid output by the power battery 1 is controlled to flow to the cooling pool by the first control water valve 15 and the second control water valve 16, and then the cooling liquid output by the cooling pool is further transported to the auxiliary cooling module 13 for further cooling by the sub-control module 17. After the cooling liquid meeting the target temperature is obtained, all the cooling liquid is transported back to the power battery. When the cooling capacity of the cooling pool is sufficient, the proportion of the cooling liquid transported to the cooling pool can be adjusted according to the required cooling amplitude of the power battery 1. When the required cooling amplitude is small, only part of the cooling liquid output by the power battery 1 is sent to the cooling pool, and the other part is not sent to the cooling pool but is mixed with the cooling liquid output by the cooling pool after being branched by the second control water valve 16, and then all the mixed cooling liquid is sent back to the power battery 1 after being branched by the sub-control module 17. When the required cooling amplitude is large, all the cooling liquid output by the power battery is sent to the cooling pool after being branched by the second control water valve 16. At this time, the cooling liquid output from the cooling pool already meets the target temperature, and all the cooling liquid can be sent back to the power battery 1 after being branched by the sub-control module 17.

[0090] In summary, the system can flexibly adjust the temperature control strategy according to different working conditions, and improve the pertinence and efficiency of temperature control.

[0091] In a preferred embodiment, the target temperature can be a temperature range.

[0092] The embodiment of the application also provides a method for controlling the temperature of an external battery.

[0093] The real-time temperatures and real-time powers of the plurality of power batteries 1 during charging are collected and processed respectively to obtain the target temperature of each power battery 1.

[0094] The cooling liquid output by the plurality of power batteries 1 is warmed, and after the cooling liquid meeting the target temperature is obtained, the cooling liquid is fed back to the power batteries 1, and the real-time flow of the cooling liquid fed to each power battery 1 is controlled.

[0095] In a preferred embodiment, the target control temperature of each power battery 1 is obtained according to the real-time temperature and the real-time power of each power battery 1, and the target temperature is obtained by averaging the target control temperatures of all the power batteries 1.

[0096] The control method of the embodiment is applicable to the control system.

[0097] The present application is not limited to the above embodiments, and those skilled in the art can make several improvements and refinements without departing from the principles of the present application.

Claims

1. An external battery temperature control system, comprising: The system comprises: a heating module (11) connected to a main circuit connected to a plurality of power batteries (1), for heating the coolant output by the plurality of power batteries (1), and after obtaining the coolant meeting the target temperature, delivering the coolant back to the power batteries (1); a cooling module (12) connected to a main circuit connected to the plurality of power batteries (1), comprising a cooling pool containing coolant, for adjusting the temperature of the coolant output by the plurality of power batteries (1), and after obtaining the coolant meeting the target temperature, delivering the coolant back to the power batteries (1); a control module for collecting the real-time temperature and real-time power of the plurality of power batteries (1) during charging, and processing the real-time temperature and real-time power to obtain the target temperature of each power battery (1); the control module is also used for controlling the real-time flow of the coolant delivered by the heating module (11) and the cooling module (12) to each power battery (1); the control module comprises: a plurality of branch controllers (9) for collecting the real-time temperature and real-time power of each power battery (1), respectively; also for collecting the temperature and flow of the coolant output by each power battery (1), and the temperature and flow of the coolant input to each power battery (1), and sending the collected temperature and flow data to a general controller (10); also for controlling the flow of the coolant input to each power battery (1) according to the flow control instruction of the general controller (10); the branch controller (9) corresponds to the power battery (1) one by one; the general controller (10) is used for processing the target control temperature of each power battery (1) according to the real-time temperature and real-time power sent by each branch controller (9), and performing mean value processing according to the target control temperature of all power batteries (1) to obtain the target temperature; also for obtaining the flow control instruction according to the target temperature, and combining the real-time temperature and real-time power of each power battery (1); a flow control water pump (14), the branch controller (9) controls the flow of the coolant input to the power battery (1) through the flow control water pump (14); the external battery temperature control system further comprises: a first control water valve (15) connected to the control module, the heating module (11), and the cooling module (12), respectively, for controlling the flow direction of the coolant flowing out of all power batteries (1) to the heating module (11) or the cooling module (12) according to the flow direction control instruction of the control module; a second control water valve (16) connected to the control module and the cooling module (12), respectively, for controlling part of the coolant flowing out of the first control water valve (15) to flow to the cooling pool, and controlling another part of the coolant flowing out of the first control water valve (15) to mix with the coolant flowing out of the cooling pool according to the flow direction control instruction of the control module; A sub-control module (17) is connected with the control module, the cooling module (12), the heating module (11) and the auxiliary refrigeration module (13) respectively, and is used for controlling the opening and closing of the heating module (11) and the auxiliary refrigeration module (13) in the process that the cooling liquid flowing out of the second control water valve (16) flows through the heating module (11), the auxiliary refrigeration module (13) and the power battery (1) in sequence according to the flow direction control instruction of the control module; the auxiliary refrigeration module (13) is used for cooling the cooling liquid flowing out of the power battery (1) or the cooling liquid flowing out of the cooling module (12); The first control water valve (15) and the second control water valve (16) can be integrated into one water valve.

2. The external battery temperature control system of claim 1, wherein The plurality of branch controllers (9) and the total controller (10) are integrated in the same hardware.

3. The external battery temperature control system of claim 1, wherein The power battery (1) is provided with a vehicle end water outlet joint (4) for outputting the cooling liquid and a vehicle end water inlet joint (3) for receiving the cooling liquid, and the control module is provided with a temperature control end water outlet joint (6) for outputting the cooling liquid and a temperature control end water inlet joint (5) for receiving the cooling liquid; The vehicle end water outlet joint (4) is communicated with the vehicle-mounted cooling unit (18) through a water outlet pipeline, and the water outlet pipeline is provided with a first quick connector (7); when the vehicle is charging, the temperature control end water inlet joint (5) is detachably connected to the first quick connector (7); The vehicle end water inlet joint (3) is communicated with the vehicle-mounted cooling unit (18) through a water inlet pipeline, and the water inlet pipeline is provided with a second quick connector (8); when the vehicle is charging, the temperature control end water outlet joint (6) is detachably connected to the second quick connector (8).

4. The external battery temperature control system of claim 1, wherein, The cooling pool is provided with a heat preservation and heat dissipation system for controlling the temperature of the cooling liquid accommodated therein.

5. The external battery temperature control system of claim 1, wherein, When the control module judges that the target temperature is higher than the water temperature of the main circuit and the temperature of the cooling liquid in the cooling pool is higher than the water temperature of the main circuit, if the temperature of the cooling liquid in the cooling pool is higher than the target temperature, the cooling liquid flowing out of the power battery (1) is controlled to flow to the cooling module (12) through the first control water valve (15), and the percentage of the cooling liquid flowing into the cooling pool is controlled to obtain the cooling liquid meeting the target temperature after mixing; if the temperature of the cooling liquid in the cooling pool is lower than the target temperature, the cooling liquid flowing out of the power battery (1) is controlled to flow to the cooling module (12) through the first control water valve (15), the percentage of the cooling liquid flowing into the cooling pool is controlled, and the mixed cooling liquid is further heated to obtain the cooling liquid meeting the target temperature when flowing through the heating module (11) through the sub-control module (17); When the control module judges that the target temperature is higher than the water temperature of the main circuit and the temperature of the cooling liquid in the cooling pool is lower than the water temperature of the main circuit, the cooling liquid flowing out of the power battery (1) is controlled to flow to the heating module (11) through the first control water valve (15) to obtain the cooling liquid meeting the target temperature; All the cooling liquids output by the power batteries (1) are collected into the main circuit and then delivered to the control module for judgment. After the cooling liquid meeting the target temperature is obtained, the cooling liquid is transported back to the power battery (1).

6. The external battery temperature control system of claim 1, wherein, When the control module judges that the target temperature is lower than the water temperature of the main circuit and the cooling liquid temperature in the cooling pool is higher than the water temperature of the main circuit, the cooling liquid flowing out of the power battery (1) is controlled to flow to the auxiliary refrigeration module (13) through the first control water valve (15) to obtain the cooling liquid meeting the target temperature. When the control module judges that the target temperature is lower than the water temperature of the main circuit and the cooling liquid temperature in the cooling pool is lower than the water temperature of the main circuit, if the cooling liquid temperature in the cooling pool is higher than the target temperature, the cooling liquid flowing out of the power battery (1) is controlled to flow to the cooling module (12) through the first control water valve (15) and the second control water valve (16), and the cooling liquid flowing out of the cooling module (12) is controlled to be further cooled when flowing through the auxiliary refrigeration module (13) through the sub-control module (17) to obtain the cooling liquid meeting the target temperature; if the cooling liquid temperature in the cooling pool is lower than the target temperature, the cooling liquid flowing out of the power battery (1) is controlled to flow to the cooling module (12) through the first control water valve (15), and the percentage of the cooling liquid flowing into the cooling pool is controlled through the second control water valve (16) to obtain the cooling liquid meeting the target temperature. All the cooling liquid output by the power battery (1) is transported to the control module for judgment after being collected in the main circuit. After the cooling liquid meeting the target temperature is obtained, the cooling liquid is transported back to the power battery (1).

7. An external battery temperature control method, characterized by, The external battery temperature control system according to any one of claims 1-6, the method comprising: Collecting the real-time temperature and real-time power of the plurality of power batteries (1) during charging, and processing them respectively to obtain the target temperature of each power battery (1); The cooling liquid output by the plurality of power batteries (1) is temperature-regulated to obtain the cooling liquid meeting the target temperature, and the cooling liquid is transported back to the power battery (1), and the real-time flow of the cooling liquid transported to each power battery (1) is controlled.

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