A flow machine device hybrid battery apparatus and a control method thereof

Abstract

The application provides a flow machine equipment hybrid battery device and a control method thereof. The flow machine equipment hybrid battery device comprises: a power battery used for driving power supply of a flow machine equipment; a thermal management unit connected in parallel with the power battery in an open / close mode and used for heating / cooling the power battery; and a low-temperature battery connected in parallel with the thermal management unit in an open / close mode and used for supplying power to the thermal management unit to heat / cool the power battery. The flow machine equipment hybrid battery device and the control method thereof can efficiently and at low cost preheat the power battery before starting in a low-temperature condition, and can cool the power battery when the normal working temperature of the power battery is too high, thereby ensuring normal and stable working of the power battery, and the structure is simple to control and easy to maintain.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic flow machine equipment, in particular to a flow machine equipment hybrid battery device and a control method thereof. BACKGROUND

[0002] In order to work at low temperature, the automatic flow machine equipment needs to be equipped with low-temperature power batteries or use a diesel-electric hybrid scheme, that is, a diesel engine, a generator, a rectifier and other devices are added to the flow machine equipment, the diesel engine power house is used to preheat the conventional power battery, the low-temperature power battery is expensive and has low energy density, which affects the cost and energy consumption of the flow machine equipment, and the diesel engine needs to be preheated by a water jacket heater at low temperature, the whole preheating process takes a long time, and the diesel engine power house is large in size, complex in structure, high in cost, and increases the weight of the flow machine equipment, affecting the cost and energy consumption of the flow machine equipment. SUMMARY

[0003] Therefore, the present application provides a flow machine equipment hybrid battery device and a control method thereof, which can efficiently and at low cost preheat the power battery before starting at low temperature, and can cool the power battery when the normal working temperature of the power battery is too high, thereby ensuring the normal and stable operation of the power battery, and the structure is simple to control and easy to maintain.

[0004] To solve the above technical problems, the present application adopts the following technical scheme:

[0005] The flow machine equipment hybrid battery device according to the first aspect of the present application comprises:

[0006] a power battery, which is used to supply power to drive the flow machine equipment;

[0007] a thermal management unit, which is connected in parallel with the power battery in an open / close manner, and is used to heat / cool the power battery;

[0008] a low-temperature battery, which is connected in parallel with the thermal management unit in an open / close manner, and is used to supply power to the thermal management unit to heat / cool the power battery.

[0009] Further, it further comprises:

[0010] a battery high-voltage box, wherein the power battery, the thermal management unit and the low-temperature battery are connected in an open / close manner through the battery high-voltage box.

[0011] Further, the power battery is formed with a discharge interface, and the battery high-voltage box comprises:

[0012] A power battery negative pole relay K1, a negative pole of the power battery negative pole relay K1 is electrically connected with a negative pole of the power battery, and positive poles of the power battery negative pole relay K1 are respectively electrically connected with a negative pole of the thermal management unit, a negative pole of the discharge interface and a negative pole of the low-temperature battery;

[0013] A power battery discharge relay K3, negative poles of the power battery discharge relay K3 are respectively electrically connected with a positive pole of the discharge interface and a positive pole of the thermal management unit, and a positive pole of the power battery discharge relay K3 is electrically connected with a positive pole of the power battery;

[0014] A thermal management unit relay K5, negative poles of the thermal management unit relay K5 are respectively electrically connected with a positive pole of the thermal management unit and a positive pole of the low-temperature battery, and a positive pole of the thermal management unit relay K5 is electrically connected with a negative pole of the power battery discharge relay K3;

[0015] A low-temperature battery relay K6, a negative pole of the low-temperature battery relay K6 is electrically connected with a negative pole of the thermal management unit relay K5, and a positive pole of the low-temperature battery relay K6 is electrically connected with a positive pole of the low-temperature battery.

[0016] Further, the battery high-voltage box further comprises:

[0017] A current-limiting device, which is electrically connected between the power battery and the thermal management unit.

[0018] Further, the current-limiting device is a DCDC converter, and the DCDC converter has four interfaces,

[0019] A first interface of the DCDC converter is electrically connected with a negative pole of the thermal management unit relay K5, a second interface of the DCDC converter is electrically connected with a positive pole of the power battery negative pole relay K1, a third interface of the DCDC converter is electrically connected with a positive pole of the thermal management unit and a negative pole of the low-temperature battery relay K6, and a fourth interface of the DCDC converter is electrically connected with a negative pole of the thermal management unit and a negative pole of the low-temperature battery.

[0020] Further, the current-limiting device is a current-limiting resistor, one end of the current-limiting resistor is electrically connected with a negative pole of the thermal management unit relay K5, and the other end of the current-limiting resistor is electrically connected with a positive pole of the thermal management unit and a negative pole of the low-temperature battery relay.

[0021] Further, the battery high-voltage box further comprises:

[0022] A power battery pre-charging relay K2 and a voltage dividing current limiting resistor R1 connected in series with the power battery pre-charging relay K2, the power battery pre-charging relay K2 being connected in parallel with the voltage dividing current limiting resistor R1 to the power battery discharge relay K3.

[0023] Further, the power battery further comprises a charging interface, and the battery high-voltage box further comprises:

[0024] A power battery charging relay K4, a negative electrode of the power battery charging relay K4 being electrically connected to a positive electrode of the power battery, and a positive electrode of the power battery charging relay K4 being electrically connected to a positive electrode of the charging interface,

[0025] A negative electrode of the charging interface being electrically connected to a positive electrode of the power battery negative electrode relay K1.

[0026] Further, the battery high-voltage box further comprises:

[0027] A battery BMS, a voltage detection negative electrode of the battery BMS being electrically connected to a negative electrode of the power battery negative electrode relay K1, and voltage detection positive electrodes of the battery BMS being respectively electrically connected between the power battery discharge relay K3 and the positive electrode of the power battery, the battery BMS being used for monitoring and managing the power battery and the low-temperature battery.

[0028] The control method of the hybrid battery device of the flow machine device according to the second aspect of the present application comprises a discharging process, comprising the following steps:

[0029] S1, performing self-checking on the power battery, and connecting a negative electrode of the power battery to a negative electrode of the thermal management unit after the self-checking is correct;

[0030] S2, detecting whether the power battery is at a working temperature, and if yes, turning to S4; otherwise, turning to S3;

[0031] S3, connecting the low-temperature battery to the thermal management unit to preheat the power battery to a rated working temperature by the thermal management unit, and performing pre-charging, and entering a working mode after the pre-charging is completed;

[0032] S4, directly performing pre-charging, and entering a working mode after the pre-charging is completed.

[0033] Further, the hybrid battery device of the flow machine device comprises a battery high-voltage box, the battery high-voltage box comprising a power battery negative electrode relay K1, a power battery discharge relay K3, a thermal management unit relay K5, a low-temperature battery relay K6, a current limiting device, and a power battery pre-charging relay K2,

[0034] The step S3 comprises:

[0035] S31, closing the low-temperature battery relay K6 to preheat the power battery;

[0036] S32, the power battery is preheated to the rated working temperature, and the thermal management unit relay K5 is closed;

[0037] S33, the power battery pre-charge relay K2 is closed, and pre-charge is performed until the power battery load-side voltage reaches a set threshold value;

[0038] S34, after the pre-charge is completed, the power battery discharge relay K3 is closed, the power battery pre-charge relay K2 is disconnected, and the working mode is entered;

[0039] The step S4 comprises:

[0040] S41, the thermal management unit relay K5 is closed;

[0041] S42, the power battery pre-charge relay K2 is closed, and pre-charge is performed until the power battery load-side voltage reaches a set threshold value;

[0042] S43, after the pre-charge is completed, the power battery discharge relay K3 is closed, the power battery pre-charge relay K2 is disconnected, and the low-temperature battery relay K6 is closed to enter the working mode.

[0043] Further, in the step S33, the set threshold value ranges from 90% to 95% of the rated voltage of the power battery.

[0044] Further, the power battery further comprises a charging interface, the battery high-voltage box further comprises a power battery charging relay K4, and the control method further comprises a charging process, the charging process comprising the following steps:

[0045] S100, self-checking of the power battery is performed, and after the self-checking is correct, the power battery negative electrode relay K1 is closed;

[0046] S200, when the CC2 signal is detected, it is detected whether the power battery is at a working temperature,

[0047] Yes, the power battery charging relay K4 is closed to perform fast charging until the charging is completed;

[0048] Otherwise, the low-temperature battery relay K6 is closed to preheat the power battery until the rated working temperature, after the preheating is completed, the thermal management unit relay K5 is closed, and then the power battery charging relay K4 is closed to perform fast charging until the charging is completed.

[0049] The above technical solutions of the present application have at least one of the following beneficial effects:

[0050] The flow machine equipment hybrid battery device and the control method thereof according to the embodiment of the present application can efficiently and at low cost preheat the power battery before starting under low temperature conditions, and can cool the power battery when the temperature of the power battery is too high, thereby ensuring the normal and stable operation of the power battery, and the device has simple structure, stable and reliable control and is easy to maintain.

[0051] In addition, since the low-temperature battery has small capacity, compared with the existing single low-temperature power battery scheme and the diesel-electric hybrid scheme, the whole device has small self-weight and relatively simple structure and circuit, which is beneficial to daily maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 A circuit principle diagram of the flow machine equipment hybrid battery device according to the embodiment of the present application;

[0053] Figure 2 Another circuit principle diagram of the flow machine equipment hybrid battery device according to the embodiment of the present application;

[0054] Figure 3 A flow chart of the control method of the flow machine equipment hybrid battery device according to the embodiment of the present application;

[0055] Figure 4 A discharge flow chart of the control method of the flow machine equipment hybrid battery device according to the embodiment of the present application;

[0056] Figure 5 A charging flow chart of the control method of the flow machine equipment hybrid battery device according to the embodiment of the present application.

[0057] Fig. 1 is a schematic diagram of the flow machine equipment hybrid battery device according to the embodiment of the present application. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0059] Unless otherwise defined, technical terms or scientific terms used in the present disclosure shall have the ordinary meanings to those skilled in the art of the present disclosure. The terms "first", "second", and similar terms are used herein merely to distinguish one element from another, and do not necessarily indicate any order or sequence or importance. The terms "connected", "coupled", and similar terms are not limited to direct connections or physical connections, but can include indirect connections or indirect physical connections, such as electrical connections.

[0060] The flow machine equipment hybrid battery device and the control method thereof according to the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0061] The flow machine equipment hybrid battery device according to the first aspect of the present disclosure comprises a power battery 100, a thermal management unit 200, and a low-temperature battery 300. Figure 1 The flow machine equipment hybrid battery device according to the first aspect of the present disclosure comprises a power battery 100, a thermal management unit 200, and a low-temperature battery 300.

[0062] The power battery 100 is configured to supply power to drive the flow machine equipment.

[0063] The thermal management unit 200 is configured to be connected in parallel with the power battery 100 in an on / off manner, and configured to heat / cool the power battery 100.

[0064] The low-temperature battery 300 is configured to be connected in parallel with the thermal management unit 200 in an on / off manner, and configured to supply power to the thermal management unit 200 to heat / cool the power battery 100.

[0065] The flow machine equipment hybrid battery device according to the embodiments of the present disclosure comprises the power battery 100, the thermal management unit 200, and the low-temperature battery 300. The power battery 100 and the low-temperature battery 300 can be placed in a battery cabinet 600, and the thermal management unit 200 is connected to the power battery 100 to heat the power battery 100. As an example, in a low-temperature working environment, the low-temperature battery 300 is first enabled to supply power to the thermal management unit 200, and the thermal management unit 200 is started to preheat the power battery 100 to the rated temperature. When the power battery 100 reaches the normal working temperature, the power battery 100 is enabled to supply power to drive the flow machine equipment.

[0066] The flow machine equipment hybrid battery device according to the embodiments of the present disclosure can efficiently and at low cost preheat the power battery 100 by adding a small-capacity low-temperature battery 300 to preheat and supply power to the power battery 100 in a low-temperature environment, so that the flow machine equipment can operate normally. Compared with the existing single low-temperature power battery solution and the diesel-electric hybrid solution, the flow machine equipment hybrid battery device has a simple and light structure, low energy consumption, and is easy to maintain.

[0067] In addition, the flow machine equipment hybrid battery device of the embodiment of the present application can also cool the power battery 100 through the heat management unit 200 when the flow machine equipment is overheated after normal operation, for example, the heat management unit 200 can directly start the water pump and the compressor to cool the power battery 100 when the temperature of the power battery 100 is detected to be too high.

[0068] Further, the flow machine equipment hybrid battery device further comprises:

[0069] The battery high-voltage box 500 is connected to the power battery 100, the heat management unit 200 and the low-temperature battery 300 in an open / close manner.

[0070] Specifically, the power battery 100, the heat management unit 200 and the low-temperature battery 300 are connected to the battery high-voltage box 500 in an open / close manner, which facilitates centralized supervision and control of the three modules, and is convenient to connect and operate.

[0071] Further, the power battery 100 is formed with a discharge interface, and the battery high-voltage box 500 comprises a power battery negative relay K1, a power battery discharge relay K3, a heat management unit relay K5 and a low-temperature battery relay K6.

[0072] The negative electrode of the power battery negative relay K1 is electrically connected to the negative electrode of the power battery 100, and the positive electrode of the power battery negative relay K1 is electrically connected to the negative electrode of the heat management unit 200, the negative electrode of the discharge interface and the negative electrode of the low-temperature battery 300, respectively.

[0073] The negative electrode of the power battery discharge relay K3 is electrically connected to the positive electrode of the discharge interface and the positive electrode of the heat management unit 200, respectively, and the positive electrode of the power battery discharge relay K3 is electrically connected to the positive electrode of the power battery 100.

[0074] The negative electrode of the heat management unit relay K5 is electrically connected to the positive electrode of the heat management unit 200 and the positive electrode of the low-temperature battery 300, respectively, and the positive electrode of the heat management unit relay K5 is electrically connected to the negative electrode of the power battery discharge relay K3.

[0075] The negative electrode of the low-temperature battery relay K6 is electrically connected to the negative electrode of the heat management unit relay K5, and the positive electrode of the low-temperature battery relay K6 is electrically connected to the positive electrode of the low-temperature battery 300.

[0076] Specifically, the battery high-voltage box 500 is provided with a power battery negative pole relay K1 for controlling the on-off between the negative pole of the power battery 100 and the negative pole of the thermal management unit 200 and the negative pole of the discharge interface; a power battery discharge relay K3 for controlling the on-off between the positive pole of the power battery 100 and the positive pole of the thermal management unit 200 and the positive pole of the discharge interface; a thermal management unit relay K5 for controlling the on-off between the negative pole of the power battery discharge relay K3 and the positive pole of the thermal management unit 200 and the positive pole of the low-temperature battery 300; and a low-temperature battery relay K6 for controlling the on-off between the positive pole of the low-temperature battery 300 and the negative pole of the thermal management unit relay K5.

[0077] Further, the battery high-voltage box 500 further comprises:

[0078] A current-limiting device, which is electrically connected between the power battery 100 and the thermal management unit 200.

[0079] Since the power battery 100, the low-temperature battery 300 and the thermal management unit 200 can be at different voltage platforms, after the power battery 100 normally discharges, the power battery 100 can supply power to the low-temperature battery 300 and the thermal management unit 200, so as to protect the low-temperature battery 300 and the thermal management unit 200 from overcharging. The current-limiting device is arranged between the power battery 100 and the thermal management unit 200, which can effectively limit the charging current and has a protection effect.

[0080] In some embodiments, the current-limiting device is a DCDC converter, which has four interfaces. The first interface of the DCDC converter is electrically connected to the negative pole of the thermal management unit relay K5, the second interface of the DCDC converter is electrically connected to the positive pole of the power battery negative pole relay K1, the third interface of the DCDC converter is electrically connected to the positive pole of the thermal management unit 200 and the negative pole of the low-temperature battery relay K6, and the fourth interface of the DCDC converter is electrically connected to the negative pole of the thermal management unit 200 and the negative pole of the low-temperature battery 300.

[0081] Specifically, as shown in Figure 1 To protect against overcharging, the DCDC converter is installed to limit the charging current, and the DCDC converter has strong applicability. The DCDC converter is connected in parallel on the positive and negative pole circuit of the power battery 100.

[0082] In other embodiments, the current-limiting device is a current-limiting resistor, one end of which is electrically connected to the negative pole of the thermal management unit relay K5, and the other end of which is electrically connected to the positive pole of the thermal management unit 200 and the negative pole of the low-temperature battery relay.

[0083] Specifically, as shown in Figure 2As shown, when the power battery 100 and the low-temperature battery 300 and the thermal management unit 200 can be at the same voltage platform or similar platform, in order to protect from overcharging, a current-limiting resistor R2 with lower cost can be selected, which is connected in series to the positive electrode circuit of the power battery 100.

[0084] Further, the battery high-voltage box 500 further comprises:

[0085] The power battery pre-charging relay K2 and the voltage-dividing current-limiting resistor R1 connected in series to the power battery pre-charging relay K2 are connected in parallel to the power battery discharge relay K3.

[0086] Specifically, the power battery pre-charging relay K2 is arranged to control the on-off of the pre-charging circuit connected in parallel to the discharge circuit before the power battery 100 is enabled to discharge, and the voltage-dividing current-limiting resistor R1 is arranged to divide voltage and limit current on the pre-charging circuit.

[0087] Further, the power battery 100 further comprises a charging interface, and the battery high-voltage box 500 further comprises:

[0088] The power battery charging relay K4, the negative electrode of which is electrically connected to the positive electrode of the power battery 100, and the positive electrode of which is electrically connected to the positive electrode of the charging interface,

[0089] The negative electrode of the charging interface is electrically connected to the positive electrode of the power battery negative electrode relay K1.

[0090] Specifically, the power battery charging relay K4 is arranged to control the on-off of the positive electrode circuit of the power battery charging, and the negative electrode circuit of the power battery charging is controlled by the power battery negative electrode relay K1.

[0091] Further, the battery high-voltage box 500 further comprises:

[0092] The battery BMS 400, the voltage detection negative electrode of which is electrically connected to the negative electrode of the power battery negative electrode relay K1, and the voltage detection positive electrode of which is electrically connected between the power battery discharge relay K3 and the positive electrode of the power battery 100, respectively, the battery BMS 400 being arranged to monitor and manage the power battery 100 and the low-temperature battery 300.

[0093] Specifically, the battery BMS 400 is powered by an external low-voltage supply, usually 24V, and is arranged to monitor and manage the power battery 100 and the low-temperature battery 300, such as detecting the temperature of the power battery 100, and being responsible for calculating and controlling the heating, cooling, discharging rate of the power battery 100, the charging rate of the low-temperature battery 300, and the charging current value during charging.

[0094] The control method of the flow machine equipment hybrid battery device according to the second aspect of the present application, as shown in the figure, comprises a discharging process, which comprises the following steps: Figure 4

[0095] S1, self-checking of the power battery is performed, and after the self-checking is correct, the negative electrode of the power battery is connected to the negative electrode of the thermal management unit;

[0096] S2, it is detected whether the power battery is at a working temperature, and if yes, S4 is entered; otherwise, S3 is entered;

[0097] S3, the low-temperature battery is connected to the thermal management unit to preheat the power battery to a rated working temperature by the thermal management unit, pre-charging is performed, and after the pre-charging is completed, a working mode is entered;

[0098] S4, pre-charging is directly performed, and after the pre-charging is completed, the working mode is entered.

[0099] The control method of the flow machine equipment hybrid battery device according to the second aspect of the present application refers to the flow machine equipment hybrid device of the first aspect of the present application, first, self-checking of the power battery is performed, the self-checking items include detecting the voltage, temperature and insulation of the power battery, after the self-checking is correct, the negative electrode of the power battery is connected to the negative electrode of the thermal management unit; secondly, it is detected whether the power battery is at a working temperature, if yes, pre-charging is directly performed, after the pre-charging is completed, the discharging circuit of the power battery is connected to enter a normal discharging working mode, otherwise, the low-temperature battery is connected to the thermal management unit, the thermal management unit is powered by the low-temperature battery to operate to preheat the power battery, until the power battery is preheated to a rated working temperature, pre-charging is performed, and after the pre-charging is completed, the discharging circuit of the power battery is connected to enter the normal discharging working mode.

[0100] The discharging process of the control method of the flow machine equipment hybrid battery device according to the second aspect of the present application, before the power battery normally works, the working temperature of the power battery is detected, if the temperature is at a normal working temperature, the working mode can be directly entered, if the temperature is lower than the normal working temperature, the low-temperature battery is connected to the thermal management unit to preheat the power battery, until the power battery reaches a rated working temperature, and then the normal working mode discharging is supplied to drive the flow machine. The discharging process control is simple, realizes stable and reliable monitoring of the working temperature of the power battery and makes the power battery work at a rated working temperature, and ensures the stable and normal working of the power battery.

[0101] In addition, after the power battery enters the normal discharging working mode, the temperature of the power battery may be too high, at this time, the thermal management unit can be controlled to receive the battery BMS instruction to start the cooling work of the power battery.

[0102] ​Furthermore, the hybrid battery device for the flow turbine equipment includes a high-voltage battery box, which includes a power battery negative terminal relay K1, a power battery discharge relay K3, a thermal management unit relay K5, a low-temperature battery relay K6, a current limiting device, and a power battery pre-charge relay K2. For the specific structure, please refer to the description of this embodiment of the hybrid battery device for the flow turbine equipment. Under this structure,

[0103] Step S3 specifically includes:

[0104] S31. Close the low-temperature battery relay K6 to preheat the power battery;

[0105] S32. Preheat the power battery to the rated operating temperature and close the thermal management unit relay K5.

[0106] S33. Close the power battery pre-charge relay K2 to perform pre-charge until the power battery load side voltage reaches the set threshold.

[0107] S34. After pre-charging is complete, close the power battery discharge relay K3 and open the power battery pre-charge relay K2 to enter the working mode.

[0108] Step S4 includes:

[0109] S41, Close the thermal management unit relay K5;

[0110] S42. Close the power battery pre-charge relay K2 to perform pre-charge until the power battery load side voltage reaches the set threshold.

[0111] S43. After pre-charging is completed, close the power battery discharge relay K3, open the power battery pre-charge relay K2, and close the low-temperature battery relay K6 to enter the working mode.

[0112] In other words, such as Figure 3 As shown, after the self-test is successful, firstly, it is determined whether the power battery is at the rated operating temperature. If the power battery is at the operating temperature, the thermal management unit relay K5 is closed, and then the power battery pre-charge relay K2 is closed to perform pre-charge until the power battery load side voltage reaches the set threshold. When the power battery pre-charge is completed, the power battery discharge relay K3 is closed, the power battery pre-charge relay K2 is opened, and the low temperature battery relay K6 is closed to enter the normal discharge working mode.

[0113] If the power battery is below the operating temperature, the low temperature battery relay K6 is closed to preheat the power battery until it reaches the rated operating temperature. Once the power battery reaches the rated operating temperature, the thermal management unit relay K5 and the power battery precharge relay K2 are closed in sequence to perform precharge. After precharge is completed, the power battery discharge relay K3 is closed and the power battery precharge relay K2 is opened to enter the discharge working mode.

[0114] Wherein, before the power battery enters the normal discharge mode, the power battery pre-charge relay K2 is closed for pre-charge, because the power consumption equipment of the flow machine device has a capacitor, and if the power battery discharge relay K3 is directly closed, a large instantaneous current will cause the relay to stick, and the pre-charge can limit the current value in the process of charging the capacitor of the power consumption equipment, that is, the pre-charge makes the power battery load side voltage gradually reach the set threshold, prevents the relay from sticking, and has the effect of a buffer protection circuit.

[0115] In addition, when the power battery is in normal discharge, the power battery negative relay K1, the power battery discharge relay K3, the thermal management unit relay K5 and the low-temperature battery relay K6 are closed, and a loop for reverse charging the thermal management unit and the low-temperature battery is formed, which can not only continuously supply power to the thermal management unit, but also can reverse the power to the low-temperature battery, which is practical and effectively reduces the use cost and energy consumption of the equipment.

[0116] Further, in step S33, the threshold range is set to 90%~95% of the rated voltage of the power battery.

[0117] Specifically, when the actual load side voltage of the power battery is pre-charged to 90%~95% of the rated voltage of the power battery, the power battery discharge relay K3 can be closed, which avoids the large instantaneous current causing the relay to stick.

[0118] Further, the power battery further comprises a charging interface, and the battery high-voltage box 500 further comprises a power battery charging relay K4, and the control method further comprises a charging process, as shown in Figure 5 The charging process comprises the following steps:

[0119] S100, self-checking of the power battery is performed, and after the self-checking is correct, the power battery negative relay K1 is closed;

[0120] S200, when the CC2 signal is detected, whether the power battery is in a working temperature is detected,

[0121] Yes, the power battery charging relay K4 is closed for fast charging until the charging is completed;

[0122] Otherwise, the low-temperature battery relay K6 is closed to preheat the power battery to the rated working temperature, after the preheating is completed, the thermal management unit relay K5 is closed, and then the power battery charging relay K4 is closed for fast charging until the charging is completed.

[0123] The specific charging process is as shown in Figure 3As shown, first, after self-checking is correct, the CC2 signal is detected by the battery BMS to enter the charging mode, before normal charging, it also needs to detect whether the power battery is at working temperature, if it is at normal working temperature, the power battery charging relay K4 is directly closed, the power battery negative relay K1 and the power battery charging relay K4 are closed at the same time to form a charging circuit to charge the power battery quickly until the charging is completed; if it is detected that the power battery is not at working temperature, the low-temperature battery relay K6 needs to be closed to make the low-temperature battery supply power to the thermal management unit to preheat the power battery, after the power battery reaches the rated working temperature, the thermal management unit relay K5 is closed, then the power battery charging relay K4 is closed to charge the power battery quickly, at this time, the thermal management unit and the low-temperature battery can also be reverse charged during charging.

[0124] In summary, according to the control method of the power battery, the charging and discharging process can preheat the power battery to the rated working temperature before starting the power battery under the condition of being lower than the working temperature, and then use the power battery, which ensures the normal charging and discharging work of the power battery. In addition, when the power battery is normally charged and discharged after preheating, the thermal management unit and the low-temperature battery can be reverse powered and powered, the control is simple and accurate, the energy consumption cost is low, and the working efficiency of the power battery is effectively improved. In addition, when the temperature of the power battery is too high during normal work, the thermal management unit can be directly driven to cool the power battery, which effectively ensures the stable work of the battery.

[0125] The above is the preferred embodiment of the present application, it should be noted that for ordinary skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A flow machine apparatus hybrid battery device, characterized by, The battery high-voltage box comprises: a power battery for driving the flow machine device, the power battery being formed with a discharging interface; a thermal management unit connected in parallel with the power battery in an on / off manner, for heating / cooling the power battery, the thermal management unit starting a water pump and a compressor to cool the power battery; a low-temperature battery connected in parallel with the thermal management unit in an on / off manner, for supplying power to the thermal management unit to heat / cool the power battery; and a battery high-voltage box comprising: a power battery negative pole relay K1, a negative pole of the power battery negative pole relay K1 being electrically connected to a negative pole of the power battery, and a positive pole of the power battery negative pole relay K1 being electrically connected to a negative pole of the thermal management unit, a negative pole of the discharging interface and a negative pole of the low-temperature battery, respectively; a power battery discharging relay K3, a negative pole of the power battery discharging relay K3 being electrically connected to a positive pole of the discharging interface and a positive pole of the thermal management unit, respectively, and a positive pole of the power battery discharging relay K3 being electrically connected to a positive pole of the power battery; a thermal management unit relay K5, a negative pole of the thermal management unit relay K5 being electrically connected to a positive pole of the thermal management unit and a positive pole of the low-temperature battery, respectively, and a positive pole of the thermal management unit relay K5 being electrically connected to a negative pole of the power battery discharging relay K3; a low-temperature battery relay K6, a negative pole of the low-temperature battery relay K6 being electrically connected to a negative pole of the thermal management unit relay K5, and a positive pole of the low-temperature battery relay K6 being electrically connected to a positive pole of the low-temperature battery; 2. The flow machine device hybrid battery apparatus of claim 1, wherein, a power battery pre-charging relay K2 and a voltage dividing current limiting resistor R1 connected in series with the power battery pre-charging relay K2, the power battery pre-charging relay K2 being connected in parallel with the voltage dividing current limiting resistor R1 to the power battery discharging relay K3. The battery high-voltage box further comprises:

3. The flow machine device hybrid battery apparatus of claim 2, wherein, a current limiting device electrically connected between the power battery and the thermal management unit. The current limiting device is a DCDC converter, the DCDC converter having four interfaces, 4. The flow machine equipment hybrid battery apparatus of claim 2, wherein, a first interface of the DCDC converter being electrically connected to a negative pole of the thermal management unit relay K5, a second interface of the DCDC converter being electrically connected to a positive pole of the power battery negative pole relay K1, a third interface of the DCDC converter being electrically connected to a positive pole of the thermal management unit and a negative pole of the low-temperature battery relay K6, and a fourth interface of the DCDC converter being electrically connected to a negative pole of the thermal management unit and a negative pole of the low-temperature battery.

5. The flow machine equipment hybrid battery apparatus of claim 1, wherein, The current limiting device is a current limiting resistor, one end of the current limiting resistor being electrically connected to a negative pole of the thermal management unit relay K5, and the other end of the current limiting resistor being electrically connected to a positive pole of the thermal management unit and a negative pole of the low-temperature battery relay. The power battery further comprises a charging interface, and the battery high-voltage box further comprises: A power battery charging relay K4, a negative electrode of the power battery charging relay K4 is electrically connected to a positive electrode of the power battery, and a positive electrode of the power battery charging relay K4 is electrically connected to a positive electrode of the charging interface, A negative electrode of the charging interface is electrically connected to a positive electrode of the power battery negative electrode relay K1.

6. The flow machine equipment hybrid battery apparatus of claim 1, wherein, The battery high-voltage box further comprises: A battery BMS, a voltage detection negative electrode of the battery BMS is electrically connected to a negative electrode of the power battery negative electrode relay K1, and voltage detection positive electrodes of the battery BMS are respectively electrically connected between the power battery discharge relay K3 and the positive electrode of the power battery, and the battery BMS is used for monitoring and managing the power battery and the low-temperature battery.

7. A control method of a hybrid battery device based on the flow machine apparatus according to any one of claims 1 to 6, characterized by, The flow machine equipment hybrid battery device comprises a battery high-voltage box, and the control method comprises a discharging process, specifically comprising the following steps: S1, self-checking of the power battery is performed, and after the self-checking is correct, a negative electrode of the power battery is connected to a negative electrode of the thermal management unit; S2, whether the power battery is at a working temperature is detected, if yes, proceeding to S4, otherwise, proceeding to S3; S3, the low-temperature battery is connected to the thermal management unit to preheat the power battery to a rated working temperature by the thermal management unit, and precharging is performed, and after the precharging is completed, a working mode is entered; S4, directly performing precharging, and after the precharging is completed, entering the working mode; The S3 comprises: S31, closing the low-temperature battery relay K6 to preheat the power battery; S32, the power battery is preheated to a rated working temperature, and the thermal management unit relay K5 is closed; S33, the power battery precharging relay K2 is closed, and precharging is performed until a voltage on a load side of the power battery reaches a set threshold value; S34, after the precharging is completed, the power battery discharge relay K3 is closed, the power battery precharging relay K2 is disconnected, and the working mode is entered; The S4 comprises: S41, closing the thermal management unit relay K5; S42, closing the power battery precharging relay K2, and precharging is performed until the voltage on the load side of the power battery reaches the set threshold value; S43, after the precharging is completed, the power battery discharge relay K3 is closed, the power battery precharging relay K2 is disconnected, the low-temperature battery relay K6 is closed, and the working mode is entered.

8. The control method according to claim 7, characterized by, In the step S33, the set threshold value ranges from 90% to 95% of a rated voltage of the power battery.

9. The control method according to claim 7, characterized by, The power battery further comprises a charging interface, the battery high-voltage box further comprises a power battery charging relay K4, the control method further comprises a charging process, and the charging process comprises the following steps: S100, self-checking of the power battery is performed, and after the self-checking is correct, the power battery negative electrode relay K1 is closed; S200, when a CC2 signal is detected, whether the power battery is at a working temperature is detected, If yes, close the power battery charging relay K4 for fast charging until the charging is completed. If no, close the low-temperature battery relay K6 for preheating the power battery until the rated working temperature is reached, close the thermal management unit relay K5 after the preheating is completed, and then close the power battery charging relay K4 for fast charging until the charging is completed.

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