Electricity balancing method and balancing system for battery packs in trains and carriages

Abstract

The present invention discloses a method and system for equalizing the power of battery packs in train compartments, a train and a central control unit, the method comprising: obtaining the battery pack information in each compartment, wherein the battery pack information includes the battery pack power and the maximum allowable discharge power; when determining that the train needs to perform power equalization based on the battery pack power in each compartment, obtaining the actual allowable discharge power of the battery pack that needs to be equalized based on the battery pack power in each compartment and the maximum allowable discharge power of the battery pack that needs to be equalized; and performing power limiting control on the motor in the corresponding compartment based on the actual allowable discharge power of the battery pack that needs to be equalized, so as to achieve power equalization of the battery packs in each compartment. The control method of the present invention can effectively balance the power of each battery pack, so that the train is in a balanced state, and ensure that the train will not be affected by the excessive discharge of a single or multiple battery packs or insufficient power.

Description

Technical Field

[0001] The present invention relates to the field of train technology, and in particular to a method for equalizing the charge of a battery pack in a train compartment, a system for equalizing the charge of a battery pack in a train compartment, a train, a computer-readable storage medium and a central control unit. Background Art

[0002] At present, domestic urban rail trains use their own battery packs to provide power for vehicle traction and related high-voltage equipment. This energy supply method will cause inconsistent power levels in the battery packs between different cars after the vehicle has been running for a long time, resulting in the car with a low battery pack being unable to provide sufficient power. Even if the other cars have sufficient power, they will not be able to continue operating and the vehicle needs to return to the depot for charging.

[0003] Related art proposes a power balancing device between battery groups, which absorbs power in a battery pack with a higher power level through a special device, and then transfers the absorbed power to a battery pack with a lower power level. This power balancing method requires an additional set of equipment to absorb power, which increases costs. In addition, the energy of the battery pack with a higher power level is absorbed and stored, and then the absorbed energy is transferred to the battery pack with a lower power level to charge the battery pack with a lower power level. This method causes energy loss and wastes energy during the battery charging and discharging process. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the present invention is to propose a method for balancing the power of battery packs in train compartments. When it is determined that the train needs to balance the power according to the information of the battery packs in each compartment, the actual allowable discharge power of the battery pack is calculated according to the power of each battery pack and the allowable discharge power of the battery pack that needs to be balanced, so as to control the power of the motor, so as to effectively balance the power of each battery pack, put the train in a balanced state, and ensure that the train will not be affected by the excessive discharge of a single or multiple battery packs or insufficient power.

[0005] A second objective of the present invention is to provide a battery equalization system for battery packs in train compartments.

[0006] The third object of the present invention is to provide a train.

[0007] A fourth object of the present invention is to provide a computer-readable storage medium.

[0008] A fifth objective of the present invention is to provide a central control unit.

[0009] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present invention proposes a method for power balancing of battery packs in train cars, comprising: obtaining battery pack information in each car, wherein the battery pack information includes: battery pack power and maximum allowable discharge power; when determining that the train needs to perform power balancing based on the battery pack power in each car, obtaining the actual allowable discharge power of the battery pack that needs to be power balanced based on the battery pack power in each car and the maximum allowable discharge power of the battery pack that needs to be power balanced; and limiting the power of the motor in the corresponding car based on the actual allowable discharge power of the battery pack that needs to be power balanced, so as to achieve power balancing of the battery packs in each car.

[0010] According to the method for balancing the power of battery packs in train compartments of an embodiment of the present invention, the battery pack information in each compartment is first obtained, wherein the battery pack information includes: the power of the battery pack and the maximum allowable discharge power. When it is determined that the train needs to balance the power according to the power of the battery packs in each compartment, the actual allowable discharge power of the battery packs that need to be balanced is obtained according to the power of the battery packs in each compartment and the maximum allowable discharge power of the battery packs that need to be balanced. Then, the motors in the corresponding compartments are limited in power control according to the actual allowable discharge power of the battery packs that need to be balanced, so as to achieve the balance of power of the battery packs in each compartment. Therefore, the method can effectively balance the power of each battery pack, so that the train is in a balanced state, and ensure that the train will not be affected by the excessive discharge of a single or multiple battery packs or insufficient power.

[0011] In addition, the method for balancing the battery pack in a train compartment according to the above embodiment of the present invention may also have the following additional technical features:

[0012] According to one embodiment of the present invention, it is determined that the train needs to perform power balancing based on the power level of the battery packs in each car, including: obtaining the maximum power value and the minimum power value of the battery packs in each vehicle; when the difference between the maximum power value and the minimum power value is greater than or equal to the power balancing threshold, it is determined that the train needs to perform power balancing.

[0013] According to one embodiment of the present invention, the actual allowable discharge power of the battery packs that need to be charged equalized is obtained based on the power of the battery packs in each compartment and the maximum allowable discharge power of the battery packs that need to be charged equalized, including: when the power of the battery packs in any compartment is less than the maximum power value, it is determined that the battery packs in the compartment need to be charged equalized, and the actual allowable discharge power of the battery packs in the compartment is obtained based on the maximum allowable discharge power of the battery packs in the compartment, the power of the battery packs in the compartment and the maximum power value.

[0014] According to one embodiment of the present invention, the actual allowable discharge power of the battery pack in the compartment is obtained by the following formula:

[0015]

[0016] Among them, P′ a Indicates the actual allowable discharge power of the battery pack in the compartment, K indicates the correction factor of the compartment, P a Indicates the maximum allowable discharge power of the battery pack in the vehicle, SOC a Indicates the battery pack power in the car, SOC max Indicates the maximum power value.

[0017] According to one embodiment of the present invention, when the power of a battery pack in any compartment is equal to the maximum power value, the maximum allowable discharge power of the battery pack in the compartment is used as the actual allowable discharge power of the battery pack in the compartment.

[0018] According to one embodiment of the present invention, when the difference between the maximum power value and the minimum power value is smaller than the power balancing threshold, the operating power of the motor in the corresponding compartment is controlled according to the actual allowable discharge power of the battery pack in each compartment.

[0019] According to one embodiment of the present invention, before determining that the train needs to perform power balancing, it also includes: determining that the train is in a high-voltage operating state.

[0020] To achieve the above-mentioned purpose, a second embodiment of the present invention proposes a battery pack power balancing system in a train compartment, comprising: a plurality of battery managers, each of the plurality of battery managers corresponds to a compartment setting, and each battery manager obtains battery pack information in the corresponding compartment, wherein the battery pack information includes: battery pack power and maximum allowable discharge power; a plurality of traction inverters, each of the plurality of traction inverters corresponds to a compartment setting; a central control unit, the central control unit communicates with each battery manager to obtain battery pack information in each compartment, and when determining that the train needs to perform power balancing according to the battery pack power in each compartment, the central control unit obtains the actual allowable discharge power of the battery pack that needs to be balanced according to the battery pack power in each compartment and the maximum allowable discharge power of the battery pack that needs to be balanced, and sends the actual allowable discharge power of the battery pack that needs to be balanced to the traction inverter in the corresponding compartment, so that the traction inverter in the corresponding compartment performs power limiting control on the corresponding motor to achieve power balancing of the battery packs in each compartment.

[0021] According to the battery pack power balancing system in the train compartment of the embodiment of the present invention, each of the multiple battery managers corresponds to a compartment setting, and each battery manager obtains the battery pack information in the corresponding compartment; each of the multiple traction inverters corresponds to a compartment setting; the central control unit communicates with each battery manager to obtain the battery pack information in each compartment, and when it is determined that the train needs to perform power balancing according to the battery pack power in each compartment, the actual allowable discharge power of the battery pack that needs to be balanced is obtained according to the battery pack power in each compartment and the maximum allowable discharge power of the battery pack that needs to be balanced, and the actual allowable discharge power of the battery pack that needs to be balanced is sent to the traction inverter in the corresponding compartment, so that the traction inverter in the corresponding compartment performs power limiting control on the corresponding motor to achieve power balancing of the battery packs in each compartment. As a result, the system can effectively balance the power of each battery pack, so that the train is in a balanced state, and ensure that the train will not be affected by the excessive discharge of a single or multiple battery packs or insufficient power.

[0022] In order to achieve the above-mentioned purpose, a train is proposed in an embodiment of the third aspect of the present invention, including the above-mentioned power balancing system for battery packs in a train compartment.

[0023] The train of the embodiment of the present invention, by including the above-mentioned power balancing system of the battery packs in the train compartment, can effectively balance the power of each battery pack, so that the train is in a balanced state, ensuring that the train will not be affected in operation due to insufficient power due to excessive discharge of a single or multiple battery packs.

[0024] To achieve the above-mentioned purpose, the fourth aspect of the present invention proposes a computer-readable storage medium, on which a power balancing program for a battery pack in a train compartment is stored. When the power balancing program for a battery pack in a train compartment is executed by a processor, the above-mentioned power balancing method for a battery pack in a train compartment is implemented.

[0025] The computer-readable storage medium of an embodiment of the present invention, by implementing the above-mentioned method for balancing the power of battery packs in a train compartment when executed, can effectively balance the power of each battery pack, keep the train in a balanced state, and ensure that the train will not be affected in operation due to excessive discharge or insufficient power of a single or multiple battery packs.

[0026] To achieve the above-mentioned objectives, the fifth aspect of the present invention proposes a central control unit, comprising: a memory, a processor, and a power balancing program for a battery pack in a train compartment stored in the memory and executable on the processor. When the processor executes the power balancing program, the above-mentioned power balancing method for a battery pack in a train compartment is implemented.

[0027] The central control unit of the embodiment of the present invention can effectively balance the power of each battery pack by executing the above-mentioned power balancing method of the battery pack in the train compartment, so that the train is in a balanced state, ensuring that the train will not be affected in operation due to excessive discharge or insufficient power of a single or multiple battery packs.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a flow chart of a method for balancing the power of a battery pack in a train compartment according to an embodiment of the present invention;

[0030] Figure 2 It is a flow chart of a method for equalizing the power of a battery pack in a train compartment according to a specific example of the present invention;

[0031] Figure 3 It is a block diagram of a battery equalization system for a battery pack in a train compartment according to an embodiment of the present invention;

[0032] Figure 4 is a block diagram of a train according to an embodiment of the present invention;

[0033] Figure 5 FIG. 4 is a block diagram of a central control unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] The following describes, with reference to the accompanying drawings, a method and system for balancing the power of battery packs in a train compartment, a train, a computer-readable storage medium, and a central control unit proposed in an embodiment of the present invention.

[0036] Figure 1 The figure is a flow chart of a method for balancing the power of a battery pack in a train compartment according to an embodiment of the present invention.

[0037] like Figure 1 As shown, the method for balancing the battery pack in a train compartment according to an embodiment of the present invention may include the following steps:

[0038] S1, obtaining the battery pack information in each compartment, wherein the battery pack information may include: battery pack power and maximum allowable discharge power.

[0039] In one embodiment of the present invention, after the vehicle is powered on at low voltage, the battery pack information can be collected in real time through the vehicle BMS (Battery Management System), including battery cell voltage, temperature, current total voltage of the battery pack, battery pack SOC (State Of Charge), maximum allowable amplification power, etc. The vehicle BMS system sends the battery pack information to the vehicle control unit CCU (Central Control Unit) through the vehicle network, and the vehicle control unit receives all the battery pack information.

[0040] S2, when it is determined that the train needs to perform power balancing based on the power of the battery packs in each car, the actual allowable discharge power of the battery packs that need to be balanced is obtained based on the power of the battery packs in each car and the maximum allowable discharge power of the battery packs that need to be balanced.

[0041] According to one embodiment of the present invention, it is determined that the train needs to perform power balancing based on the power of the battery packs in each car, including: obtaining the maximum power value and the minimum power value of the battery packs in each car; when the difference between the maximum power value and the minimum power value is greater than or equal to the power balancing threshold, it is determined that the train needs to perform power balancing. Among them, the power balancing threshold can be calibrated according to actual conditions. For example, the power balancing threshold can be based on information such as the minimum voltage of the battery pack monomer, the total voltage of the battery pack, or the range of differences in the product itself. For example, the power balancing threshold can be 3 or 5. It should be noted that the power balancing threshold should not be too large, because a too large power balancing threshold itself will cause power imbalance.

[0042] Further, according to an embodiment of the present invention, when the difference between the maximum power value and the minimum power value is less than the power balancing threshold, the motor operating power in the corresponding compartment is controlled according to the actual allowable discharge power of the battery pack in each compartment.

[0043] Specifically, the vehicle control unit CCU receives the battery pack power of all the compartment battery packs through the vehicle network, and then finds out the maximum and minimum power values, and calculates the power difference between the maximum and minimum power values, and determines whether the train needs to be power balanced according to the power difference. For example, when the power difference is less than the power balance threshold, it is considered that the power difference between the battery packs is not large, and power balancing is not required at this time; when the power difference is greater than or equal to the power balance threshold, it is considered that the power difference between the battery packs is large. In this case, if the train continues to run, it is easy to cause the insufficient battery to discharge too much and become insufficient, affecting the operation of the train, so the train needs to be power balanced.

[0044] Further, according to an embodiment of the present invention, the actual allowable discharge power of the battery pack that needs to be charged equalized is obtained based on the power of the battery packs in each compartment and the maximum allowable discharge power of the battery packs that need to be charged equalized, including: when the power of the battery pack in any compartment is less than the maximum power value, it is determined that the battery packs in the compartment need to be charged equalized, and the actual allowable discharge power of the battery packs in the compartment is obtained based on the maximum allowable discharge power of the battery packs in the compartment, the power of the battery packs in the compartment and the maximum power value.

[0045] In one embodiment of the present invention, the actual allowable discharge power of the battery pack in the vehicle compartment is obtained by the following formula:

[0046]

[0047] Among them, P′ a Indicates the actual allowable discharge power of the battery pack in the compartment, K indicates the correction factor of the compartment, P a Indicates the maximum allowable discharge power of the battery pack in the vehicle, SOC a Indicates the battery pack power in the car, SOC max Indicates the maximum power value.

[0048] Specifically, the vehicle control unit CCU receives the battery power and maximum allowable discharge power of the battery packs in each car through the vehicle network, and then compares the battery pack power of each car with the maximum power value in turn. When the battery pack power of a car is less than the maximum power value, it is considered that the battery pack of the car needs to be power balanced. At this time, the maximum allowable discharge power corresponding to the battery pack in the car is obtained, and the actual allowable discharge power of the car is determined according to the battery pack power, maximum allowable discharge power and maximum power value of the car. For example, the actual allowable discharge power of the car can be calculated by the above formula, where K is the correction coefficient of the car. The smaller the value, the faster the power balancing speed, the smaller the battery pack power, the smaller the actual allowable discharge power, and the faster the train balancing.

[0049] According to one embodiment of the present invention, when the power of a battery pack in any compartment is equal to the maximum power value, the maximum allowable discharge power of the battery pack in the compartment is used as the actual allowable discharge power of the battery pack in the compartment.

[0050] That is to say, when the battery pack power in the car is at the maximum power value, it means that the battery pack in the car does not need to be charged and balanced, and the motor is controlled according to the maximum allowable discharge power of the battery pack in the car, that is, the maximum allowable discharge power of the battery pack is the actual allowable discharge power.

[0051] S3, performing power limiting control on the motors in the corresponding compartments according to the actual allowable discharge power of the battery packs that need to be charged and balanced, so as to achieve charge balance of the battery packs in each compartment.

[0052] Specifically, the vehicle control unit CCU obtains the actual allowable amplified power of the battery pack in each compartment through the above steps, and then forwards the actual allowable amplified power of the battery pack in each compartment to the traction inverter TCU (Transmission Control Unit, traction inverter) in each compartment, so as to control the operating power of the motor in the corresponding compartment through the traction inverter. Among them, the actual allowable discharge power of the battery pack in the corresponding compartment received by the traction inverter in different compartments is different. When the battery power of the battery pack in the compartment is less than the maximum power value, the actual allowable discharge power received by the traction inverter in the corresponding compartment is less than the maximum allowable discharge power of the battery pack, which can limit the operating power of the motor, reduce the corresponding traction energy consumption, and reduce the battery pack power consumption. When the battery power of the battery pack in the compartment is equal to the maximum power value, the actual allowable discharge power received by the traction inverter in the corresponding compartment is equal to the maximum allowable discharge power of the battery pack, and the operating frequency of the motor is normally controlled. That is, the battery pack with low battery power has a low operating frequency of the corresponding motor, and the battery pack with high battery power has a normal control of the corresponding motor operating frequency, so that the power balance between the battery packs can be quickly achieved.

[0053] In another embodiment of the present invention, in order to achieve the purpose of balancing the battery power of the battery packs in each compartment as quickly as possible, the actual allowable discharge power can also be determined by adjusting the correction coefficient.

[0054] According to one embodiment of the present invention, before determining that the train needs to perform power balancing, the method further includes:

[0055] Make sure the train is in high-voltage operation.

[0056] In other words, only when the train is in normal operation can it be determined whether power balancing is needed based on the difference between the maximum power value, the minimum power value and the power balancing threshold.

[0057] In summary, the method for balancing the power of battery packs in train compartments of the present invention can more effectively balance the power of each battery pack, so that the train will not be affected by the excessive discharge of a single or multiple battery packs and insufficient power, so that the vehicle can always be in a balanced state.

[0058] Combine the following Figure 2 The control method of the present invention will be described.

[0059] As a specific example, the method for balancing the battery pack in a train compartment of the present invention may include the following steps:

[0060] S101, the train is powered on at low voltage.

[0061] S102, CCU receives the battery pack information in each compartment in real time.

[0062] S103, judging whether the train is in a high-voltage operation state. If yes, executing step S104; if not, executing step S112.

[0063] S104, obtaining the maximum power value SOCmax and the minimum power value SOCmin of the battery pack in each compartment.

[0064] S105, determine whether SOCmax-SOCmin≥electricity balancing threshold n is established. If yes, execute step S106; if no, execute step S107.

[0065] S106, determine whether the battery power SOCa of the battery pack in the current compartment is equal to the maximum power value SOCmax. If yes, execute S107; if not, execute step S108. Wherein, a in SOCa represents the serial number of the compartment.

[0066] S107, the CCU forwards the actual allowable discharge power (here the maximum allowable discharge power) of the battery packs in each compartment, and then executes step S109.

[0067] S108, CCU forwards the actual allowable discharge power of the battery pack in the current compartment Pa′=K*Pa*SOCa / SOCmax.

[0068] S109, the traction inverter of each carriage receives the actual allowed discharge power of the battery pack in each carriage transmitted by the CCU.

[0069] S110, each carriage traction inverter controls the motor operating power according to the actual allowable discharge power of the received battery pack.

[0070] S111, the motor in each compartment operates according to the actual allowable discharge power of the corresponding battery pack.

[0071] S112, power balancing ends.

[0072] In summary, according to the method for balancing the battery packs in train compartments of an embodiment of the present invention, under the premise of the high-voltage operation state of the vehicle, the battery pack information in each compartment is obtained, wherein the battery pack information includes: the battery pack power and the maximum allowable discharge power; when it is determined that the train needs to balance the battery packs according to the battery pack power in each compartment, the actual allowable discharge power of the battery packs that need to be balanced is obtained according to the battery pack power in each compartment and the maximum allowable discharge power of the battery packs that need to be balanced; the motors in the corresponding compartments are power-limited according to the actual allowable discharge power of the battery packs that need to be balanced, so as to achieve the balance of the battery packs in each compartment. Therefore, the method can effectively balance the power of each battery pack, so that the train is in a balanced state, and ensure that the train will not be affected by the excessive discharge of a single or multiple battery packs or insufficient power.

[0073] Corresponding to the above-mentioned embodiment, the present invention further proposes a power balancing system for battery packs in train compartments.

[0074] like Figure 3 As shown, the power balancing system for a battery pack in a vehicle compartment according to an embodiment of the present invention includes: a plurality of battery managers 10 , a plurality of traction inverters 20 and a central control unit 30 .

[0075] Among them, each battery manager in the multiple battery managers 10 corresponds to a car setting, and each battery manager obtains the battery pack information in the corresponding car, wherein the battery pack information includes: battery pack power and maximum allowable discharge power; each traction inverter in the multiple traction inverters 20 corresponds to a car setting; the central control unit 30 communicates with each battery manager to obtain the battery pack information in each car, and when it is determined that the train needs to perform power balancing according to the battery pack power in each car, the actual allowable discharge power of the battery pack that needs to be balanced is obtained according to the battery pack power in each car and the maximum allowable discharge power of the battery pack that needs to be balanced, and the actual allowable discharge power of the battery pack that needs to be balanced is sent to the traction inverter in the corresponding car, so that the traction inverter in the corresponding car can limit the power of the corresponding motor to achieve power balancing of the battery packs in each car.

[0076] Specifically, multiple battery managers 10 collect the battery pack information in the corresponding compartment and send it through the vehicle network. The central control unit 30 receives the SOC and maximum allowable discharge power information of all compartment battery packs through the vehicle network, and calculates the actual allowable discharge power information of the battery forwarded to the traction inverter of each compartment based on the battery power and maximum allowable discharge power information of the battery packs in all compartments, and forwards the calculated actual allowable amplified power of each compartment to the corresponding traction inverter 20 through the vehicle network. The traction controller of each compartment controls the operating power of the traction motor according to the actual allowable discharge power information of the received battery pack to achieve the purpose of power balance.

[0077] According to one embodiment of the present invention, the central control unit 30 determines that the train needs to perform power balancing based on the power level of the battery packs in each car, and is specifically used to obtain the maximum power value and the minimum power value of the battery packs in each vehicle; when the difference between the maximum power value and the minimum power value is greater than or equal to the power balancing threshold, it is determined that the train needs to perform power balancing.

[0078] According to one embodiment of the present invention, the central control unit 30 obtains the actual allowable discharge power of the battery pack that needs to be charged equalized based on the power of the battery packs in each compartment and the maximum allowable discharge power of the battery pack that needs to be charged equalized, and is specifically used for: when the power of the battery pack in any compartment is less than the maximum power value, it is determined that the battery packs in the compartment need to be charged equalized, and the actual allowable discharge power of the battery pack in the compartment is obtained based on the maximum allowable discharge power of the battery pack in the compartment, the power of the battery pack in the compartment and the maximum power value.

[0079] According to one embodiment of the present invention, the central control unit 30 obtains the actual allowable discharge power of the battery pack in the vehicle compartment through the following formula:

[0080]

[0081] Among them, P′ a Indicates the actual allowable discharge power of the battery pack in the compartment, K indicates the correction factor of the compartment, P a Indicates the maximum allowable discharge power of the battery pack in the vehicle, SOC a Indicates the battery pack power in the car, SOC max Indicates the maximum power value.

[0082] According to one embodiment of the present invention, when the power of the battery pack in any compartment is equal to the maximum power value, the central control unit 30 uses the maximum allowable discharge power of the battery pack in the compartment as the actual allowable discharge power of the battery pack in the compartment.

[0083] According to one embodiment of the present invention, when the difference between the maximum power value and the minimum power value is less than the power balancing threshold, the central control unit 30 controls the motor operating power in the corresponding compartment according to the actual allowable discharge power of the battery pack in each compartment.

[0084] According to one embodiment of the present invention, before determining that the train needs to be charged and balanced, the central control unit 30 is further configured to determine that the train is in a high-voltage operating state.

[0085] It should be noted that for details not disclosed in the power balancing system for the battery pack in the train compartment of the embodiment of the present invention, please refer to the details disclosed in the power balancing method for the battery pack in the train compartment of the embodiment of the present invention, and the details will not be repeated here.

[0086] According to the battery pack power balancing system in the train compartment of the embodiment of the present invention, each of the multiple battery managers corresponds to a compartment setting, and each battery manager obtains the battery pack power and the maximum allowable discharge power in the corresponding compartment; each of the multiple traction inverters corresponds to a compartment setting; the central control unit communicates with each battery manager to obtain the battery pack information in each compartment, and when it is determined that the train needs to perform power balancing according to the battery pack power in each compartment, the actual allowable discharge power of the battery pack that needs to be balanced is obtained according to the battery pack power in each compartment and the maximum allowable discharge power of the battery pack that needs to be balanced, and the actual allowable discharge power of the battery pack that needs to be balanced is sent to the traction inverter in the corresponding compartment, so that the traction inverter in the corresponding compartment performs power limiting control on the corresponding motor to achieve power balancing of the battery packs in each compartment. As a result, the system can effectively balance the power of each battery pack, so that the train is in a balanced state, and ensure that the train will not be affected by the excessive discharge of a single or multiple battery packs or insufficient power.

[0087] Corresponding to the above embodiment, the present invention also proposes a train.

[0088] like Figure 4 As shown, the train 100 of the present invention may include a battery equalization system 110 for battery packs in the train compartment.

[0089] The train of the embodiment of the present invention, by including the above-mentioned power balancing system of the battery packs in the train compartment, can effectively balance the power of each battery pack, so that the train is in a balanced state, ensuring that the train will not be affected in operation due to insufficient power due to excessive discharge of a single or multiple battery packs.

[0090] Corresponding to the above embodiment, the present invention also proposes a computer-readable storage medium.

[0091] The computer-readable storage medium of the present invention stores a power balancing program for a battery pack in a train compartment, and when the power balancing program for a battery pack in a train compartment is executed by a processor, the above-mentioned power balancing method for a battery pack in a train compartment is implemented.

[0092] The computer-readable storage medium of an embodiment of the present invention can effectively balance the power of each battery pack by executing the above-mentioned method for balancing the power of the battery pack in the train compartment, so that the train is in a balanced state, ensuring that the train will not be affected in operation due to excessive discharge or insufficient power of a single or multiple battery packs.

[0093] Corresponding to the above embodiment, the present invention also proposes a central control unit.

[0094] like Figure 5 As shown, the central control unit 200 of the present invention may include: a memory 210, a processor 220, and a power balancing program for the battery pack in a train compartment stored in the memory 210 and executable on the processor 220. When the processor 220 executes the power balancing program, the above-mentioned power balancing method for the battery pack in the train compartment is implemented.

[0095] The central control unit of the present invention can effectively balance the power of each battery pack by executing the above-mentioned power balancing method of the battery pack in the train compartment, so that the train is in a balanced state, ensuring that the train will not be affected in operation due to excessive discharge or insufficient power of a single or multiple battery packs.

[0096] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0097] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0098] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0099] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0100] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0101] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for equalizing the charge of a battery pack in a train compartment, characterized in that: include: Obtaining battery pack information in each compartment, wherein the battery pack information includes: battery pack power and maximum allowable discharge power; When it is determined that the train needs to perform power balancing according to the power of the battery packs in each carriage, the actual allowable discharge power of the battery packs that need to be balanced is obtained according to the power of the battery packs in each carriage and the maximum allowable discharge power of the battery packs that need to be balanced; According to the actual allowable discharge power of the battery pack that needs to be balanced, the motor in the corresponding compartment is limited in power to achieve balanced power of the battery packs in each compartment; The train needs to be balanced according to the battery pack power in each compartment, including: Obtain the maximum and minimum power values ​​of the battery packs in each vehicle; When the difference between the maximum power value and the minimum power value is greater than or equal to the power balancing threshold, determining that the train needs to perform power balancing; The actual allowable discharge power of the battery pack that needs to be balanced is obtained according to the battery pack power in each compartment and the maximum allowable discharge power of the battery pack that needs to be balanced, including: When the power of the battery pack in any compartment is less than the maximum power value, it is determined that the battery pack in the compartment needs power balancing, and the actual allowable discharge power of the battery pack in the compartment is obtained according to the maximum allowable discharge power of the battery pack in the compartment, the power of the battery pack in the compartment and the maximum power value; The actual allowable discharge power of the battery pack in the vehicle is obtained by the following formula: in, It indicates the actual allowable discharge power of the battery pack in the compartment, and K indicates the correction factor of the compartment. Indicates the maximum allowable discharge power of the battery pack in the compartment. Indicates the battery power in the compartment. Indicates the maximum power value.

2. The method for equalizing the battery pack in a train compartment according to claim 1, characterized in that: When the power of the battery pack in any compartment is equal to the maximum power value, the maximum allowable discharge power of the battery pack in the compartment is used as the actual allowable discharge power of the battery pack in the compartment.

3. The method for equalizing the battery pack in a train compartment according to claim 1, characterized in that: When the difference between the maximum power value and the minimum power value is smaller than the power balancing threshold, the operating power of the motor in the corresponding compartment is controlled according to the actual allowable discharge power of the battery pack in each compartment.

4. The method for equalizing the charge of a battery pack in a train compartment according to any one of claims 1 to 3, characterized in that: Before determining that the train needs to be charged and balanced, it also includes: It is determined that the train is in a high-voltage operating state.

5. A battery balancing system for a battery pack in a train compartment, used to implement the battery balancing method for a battery pack in a train compartment according to any one of claims 1 to 4, characterized in that: The system comprises: A plurality of battery managers, each of the plurality of battery managers corresponds to a compartment setting, and each of the battery managers obtains battery pack information in the corresponding compartment, wherein the battery pack information includes: battery pack power and maximum allowable discharge power; A plurality of traction inverters, each of the plurality of traction inverters being arranged corresponding to one carriage; A central control unit communicates with each battery manager to obtain the battery pack information in each car, and when determining that the train needs to perform power balancing according to the power of the battery packs in each car, obtains the actual allowable discharge power of the battery packs that need to be balanced according to the power of the battery packs in each car and the maximum allowable discharge power of the battery packs that need to be balanced, and sends the actual allowable discharge power of the battery packs that need to be balanced to the traction inverter in the corresponding car, so that the traction inverter in the corresponding car can limit the power of the corresponding motor to achieve power balancing of the battery packs in each car.

6. A train, characterized in that: include: The power equalization system for battery packs in train compartments as described in claim 5.

7. A computer-readable storage medium, characterized in that: A power balancing program for a battery pack in a train compartment is stored thereon, and when the power balancing program for a battery pack in a train compartment is executed by a processor, a power balancing method for a battery pack in a train compartment according to any one of claims 1-4 is implemented.

8. A central control unit, characterized in that: The invention comprises a memory, a processor and a power balancing program for a battery pack in a train compartment which is stored in the memory and can be run on the processor. When the processor executes the power balancing program, a power balancing method for a battery pack in a train compartment is implemented according to any one of claims 1 to 4.

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