阅读说明：本技术 一种大中功率电动车多模块智能驱动系统的充电控制方法 (Charging control method for multi-module intelligent driving system of large and medium power electric vehicle ) 是由 卜言柱 胡宜豹 刘亚军 李玉刚 花为 刘竹园 李升� 程兴 张力 胡金龙 周建华 于 2019-10-23 设计创作，主要内容包括：本发明公开了一种大中功率电动车多模块智能驱动系统的充电控制方法及其大中功率电动车,采用单个充电器根据对应电池组的充电需求用于对至少2个电池组进行充电,在充电时,充电器与各电池组采用双向通信交互连接充电控制,通信交互的数据包括各电池组的充电电流、/和电芯电压、/和各电池组的电芯温度、/和各电池组的SOC容量,且充电器基于该通信交互的数据通过变化自身输出功率来调节各电池组的充电电流,用于避免各电池组电芯在充电时发生过压和/或过流和/或过温的问题；用于可靠保证大中功率电动车多模块智能驱动系统的安全充电,最终提升大中功率电动车多模块智能驱动系统的使用寿命。(The invention discloses a charging control method of a multi-module intelligent driving system of a high-medium power electric vehicle and the high-medium power electric vehicle, wherein a single charger is used for charging at least 2 battery packs according to the charging requirements of the corresponding battery packs, the charger and each battery pack adopt bidirectional communication interactive connection charging control during charging, the communication interactive data comprise the charging current, the cell voltage, the cell temperature and the SOC capacity of each battery pack, and the charger adjusts the charging current of each battery pack by changing the output power thereof based on the communication interactive data, so that the problems of overvoltage, overcurrent and/or overtemperature of each battery pack during charging are avoided; the charging system is used for reliably ensuring the safe charging of the multi-module intelligent driving system of the large and medium power electric vehicle, and finally prolonging the service life of the multi-module intelligent driving system of the large and medium power electric vehicle.)

1. A charging control method of a multi-module intelligent driving system of a large and medium power electric vehicle comprises a three-phase alternating current motor adopting at least 2 winding units and a motor driver unit correspondingly and electrically connected with each winding unit respectively, each motor driver unit comprises a battery pack and a controller which are electrically connected, and is characterized in that a single charger is adopted for charging at least 2 battery packs according to the charging requirement of the corresponding battery pack, the charger and each battery pack adopt bidirectional communication interactive connection charging control during charging, the communication interactive data comprises the charging current, the cell voltage, the cell temperature and the SOC capacity of each battery pack, and the charger adjusts the charging current of each battery pack by changing the output power thereof based on the communication interactive data, the method is used for avoiding the problems of overvoltage and/or overcurrent and/or overtemperature of each battery pack cell during charging.

2. The charging control method of the multi-module intelligent driving system of the large and medium power electric vehicle as claimed in claim 1, wherein the charging requirement is determined according to the cell voltage and/or the cell temperature and/or the SOC capacity of each battery pack.

3. The charging control method of the multi-module intelligent driving system of the large and medium power electric vehicle as recited in claim 1, wherein the charger comprises a high voltage to low voltage power module, a charging single chip, and a charging communication module, each battery pack comprises a plurality of battery cells and a battery management system, the battery management system comprises a battery single chip, an MOS power switch tube, and a battery communication module, the battery communication module and the charging communication module are in bidirectional communication and interactive connection, and the high voltage to low voltage power module is in charging connection with the battery cells correspondingly.

4. The charging control method of the multi-module intelligent driving system of the large and medium power electric vehicle as claimed in claim 1, wherein the charger and each battery pack are connected with each other by wire or wireless bidirectional communication.

5. The charging control method of the multi-module intelligent driving system of the large and medium power electric vehicle as claimed in claim 1, wherein the communication interconnection charging control step comprises:

s10), the charger respectively receiving charging demands from the first battery pack and the second battery pack, when the first battery pack or the second battery pack needs to be charged separately, proceeding to step S20), when the first battery pack and the second battery pack need to be charged simultaneously, proceeding to step S30);

s20), the charger charges the battery pack needing to be charged, and during charging, the charger adjusts the charging current of the battery pack by changing the output power of the charger based on the data of communication interaction, so as to avoid the problems of overvoltage and/or overcurrent and/or overtemperature of the battery cell during charging;

s30), judging whether the voltage difference value between the first battery pack and the second battery pack exceeds the preset voltage difference value of the battery packs, and when the voltage difference value exceeds the preset voltage difference value of the battery packs, entering the step S40), and when the voltage difference value does not exceed the preset voltage difference value of the battery packs, entering the step S50);

s40), charging the low-voltage battery pack according to the charging requirement of the low-voltage battery pack to improve the voltage of the low-voltage battery pack until the voltage difference value between the first battery pack and the second battery pack is within the preset range of the voltage difference value of the battery packs, and entering the step S50);

s50), charging the first battery pack and the second battery pack simultaneously, wherein the charger adjusts the charging current of each battery pack by changing the output power of the charger based on the data of communication interaction during charging, so as to avoid the problems of overvoltage and/or overcurrent and/or overtemperature of each battery pack during charging.

6. The charging control method of the multi-module intelligent driving system of the high and medium power electric vehicle according to claim 1, 2, 3, 4 or 5, wherein the first battery pack and the second battery pack respectively calculate the maximum charging current corresponding to the demand according to the sampled cell voltage and/or cell temperature and/or SOC capacity, and send the maximum charging current corresponding to the demand to the charger as the charging demand communication corresponding to the maximum charging current, the charger calculates the target charging voltage of the battery pack according to the maximum charging current required by the charger, and the target charging voltage is used as the charging target of each battery pack during charging.

7. The charging control method of the multi-module intelligent driving system of the large and medium power electric vehicle as claimed in claim 1, 2, 3, 4 or 5, wherein the step of the charger adjusting the charging current of each battery pack by varying its output power based on the data of the communication interaction comprises: when the cell voltage difference value of a certain battery pack exceeds the cell voltage difference preset value, the charger reduces the charging current of the battery pack by reducing the corresponding output power until the cell voltage difference value is within the range of the cell voltage difference preset value, and automatically restores charging according to the charging requirement of the battery pack, so that the problem that the cells of each battery pack are over-voltage during charging is solved.

8. The charging control method of the multi-module intelligent driving system of the large and medium power electric vehicle as claimed in claim 1, 2, 3, 4 or 5, wherein the step of the charger adjusting the charging current of each battery pack by varying its output power based on the data of the communication interaction comprises: when the temperature of the battery core of a certain battery pack exceeds the preset range of the temperature of the battery core, the charger reduces the charging current of the battery pack by reducing the corresponding output power to the battery pack, so that the temperature of the battery core of the battery pack is reduced until the temperature of the battery core is within the preset range of the temperature of the battery core, the charging is automatically recovered according to the charging requirement of the battery pack, and the problem that the battery core of each battery pack is over-temperature when being charged is solved.

9. The charging control method of the multi-module intelligent driving system of the large and medium power electric vehicle as claimed in claim 1, 2, 3, 4 or 5, wherein the step of the charger adjusting the charging current of each battery pack by varying its output power based on the data of the communication interaction comprises: when the charger detects that the charging current of a certain battery pack exceeds a preset maximum value of the charging current, the MOS power switch tube of the battery pack is automatically closed to enter an overcurrent protection mode, so that the problem of overcurrent of battery cells of the battery packs during charging is avoided.

10. An electric vehicle with large and medium power, which is driven by a multi-module intelligent driving system, characterized in that the charging control method of the multi-module intelligent driving system adopts the charging control method as claimed in one of claims 1 to 9, and the power of the electric vehicle is not less than 1 KW.

11. A large and medium power electric vehicle as recited in claim 10, wherein each battery pack is a ternary lithium battery.

Technical Field

The invention belongs to the field of motors, and particularly relates to a charging control method of a multi-module intelligent driving system of a high-and medium-power electric vehicle.

Background

The current situation of the existing multi-module intelligent driving system of the medium and high power motors is that the technical problems of low reliability and high cost generally exist, although the prior art proposes a motor module with multiple winding units to try to solve the technical problems, the technical problem that the multiple modules are difficult to realize unified management still exists, so the current situation that the medium and high power motors always adopt large-capacity drivers is not actually improved, which is obviously contrary to the future electric vehicle market development direction which seeks to realize higher power and high performance under the premise of low and medium cost, and therefore the market is very urgently required to solve the technical problems.

In particular, for battery modules, although the electric vehicle field proposes a design structure using two sets of batteries, it still works with a single set of batteries. Taking the electric vehicle market exported to korea as an example, the product required by the korean market is that the voltage of the whole vehicle is 48V, the speed of the whole vehicle is more than 70km/h, that is, the current for normal level road riding is more than 50A, and the maximum allowable current of the whole electric vehicle is usually more than 80A in consideration of heavy current working conditions such as load and driving ramp. Therefore, the 48V40AH lithium battery is needed to be selected in consideration of the discharge capacity of the battery, however, the volume of the lithium battery is too large, the whole space of the electric vehicle is difficult to meet, and the battery is too heavy and is not easy to disassemble and maintain. The current market method is that two groups of 48V20AH are put, one group is used up and the other group is used up, the maximum discharge current of the battery scheme exceeds 3C and the continuous operation current exceeds 2C during daily riding, and the 20AH battery has great damage, the service life of the battery is shortened, the battery is easy to heat and has potential safety hazards.

The applicant is dedicated to the research of the intelligent driving control field of the electric vehicle and also focuses on the technical bottleneck, so that a significant core research and development special subject is established to solve the problem of large and medium power driving. The research and development subject obtains a major breakthrough in 2018, and a plurality of patent application protections are intensively submitted in 2018 in 9, 19 and 9, wherein the patent application protections comprise 4 invention patent applications with the patent application numbers of CN201811094616.4, CN201811094626.8, CN201811094649.9 and CN201811097434.2, a multi-module intelligent driving system which is mainly composed of a multi-winding unit and a multi-motor driver unit which is intensively coordinated, managed and controlled and respectively and independently operated is adopted to solve the problem of large and medium power driving, the technical bottleneck that the performance of the conventional electric vehicle is unreliable in the large and medium power market and the cost is low can be remarkably improved, and the future electric vehicle market development process with higher power and high performance can be effectively promoted on the premise of low and medium cost.

After the applicant applies the above multi-module intelligent driving system scheme to the electric vehicle, with the practice of large-scale batch application, it is found that the battery of each motor driver control unit of the multi-module intelligent driving system faces the technical core problems of safe charging, discharging management and the like, and the multi-module technical field does not have prior art information which can be referred to, so the applicant hopes to further deeply research and develop the control problems faced when the multi-module intelligent driving system scheme is applied to the electric vehicle field and provide an effective solution.

Disclosure of Invention

In view of the above, the present invention provides a charging control method for a multi-module intelligent driving system of a high and medium power electric vehicle and the high and medium power electric vehicle, which are used for reliably ensuring safe charging of the multi-module intelligent driving system of the high and medium power electric vehicle, and finally prolonging the service life of the multi-module intelligent driving system of the high and medium power electric vehicle.

In order to solve the problem of safe charging and discharging management in multi-module driving, the applicant also consults a large number of prior arts, and finds that in the prior art, a charger and a battery of an electric vehicle driving are only in single-wire communication connection, no interactive information communication exists, the safe management of a charging and discharging system cannot be realized, and the safety performance of the system cannot be guaranteed. Under the technical background, a creative idea of adopting bidirectional communication interactive connection for charging and discharging control is creatively provided, so that the charging and discharging management problem in the multi-module driving system is reliably guaranteed.

The technical scheme adopted by the invention is as follows:

the invention provides a charging control method of a multi-module intelligent driving system of a large and medium power electric vehicle, the multi-module intelligent driving system of the large and medium power electric vehicle comprises a three-phase alternating current motor adopting at least 2 winding units and a motor driver unit correspondingly and electrically connected with each winding unit respectively, each motor driver unit comprises a battery pack and a controller which are electrically connected, a single charger is adopted for charging at least 2 battery packs according to the charging requirement of the corresponding battery pack, during charging, the charger and each battery pack adopt bidirectional communication interactive connection charging control, the communication interactive data comprises the charging current, the cell voltage, the cell temperature and the SOC capacity of each battery pack, and the charger adjusts the charging current of each battery pack by changing the output power thereof based on the communication interactive data, the method is used for avoiding the problems of overvoltage and/or overcurrent and/or overtemperature of each battery pack cell during charging.

Preferably, the charging requirement is determined according to a cell voltage and/or a cell temperature and/or an SOC capacity of each battery pack.

Preferably, the charger includes a high-voltage to low-voltage power supply module, a charging single chip microcomputer and a charging communication module, each battery pack includes a plurality of battery cells and a battery management system, the battery management system includes a battery single chip microcomputer, an MOS power switch tube and a battery communication module, the battery communication module is in bidirectional communication interactive connection with the charging communication module, and the high-voltage to low-voltage power supply module is in charging connection with the battery cells correspondingly.

Preferably, the charger and each battery pack are connected in a bidirectional communication and interaction manner through a wire or a wireless manner.

Preferably, the communication interconnection charging control step includes:

s10), the charger respectively receiving charging demands from the first battery pack and the second battery pack, when the first battery pack or the second battery pack needs to be charged separately, proceeding to step S20), when the first battery pack and the second battery pack need to be charged simultaneously, proceeding to step S30);

s20), the charger charges the battery pack needing to be charged, and during charging, the charger adjusts the charging current of the battery pack by changing the output power of the charger based on the data of communication interaction, so as to avoid the problems of overvoltage and/or overcurrent and/or overtemperature of the battery cell during charging;

s30), judging whether the voltage difference value between the first battery pack and the second battery pack exceeds the preset voltage difference value of the battery packs, and when the voltage difference value exceeds the preset voltage difference value of the battery packs, entering the step S40), and when the voltage difference value does not exceed the preset voltage difference value of the battery packs, entering the step S50);

s40), charging the low-voltage battery pack according to the charging requirement of the low-voltage battery pack to improve the voltage of the low-voltage battery pack until the voltage difference value between the first battery pack and the second battery pack is within the preset range of the voltage difference value of the battery packs, and entering the step S50);

s50), charging the first battery pack and the second battery pack simultaneously, wherein the charger adjusts the charging current of each battery pack by changing the output power of the charger based on the data of communication interaction during charging, so as to avoid the problems of overvoltage and/or overcurrent and/or overtemperature of each battery pack during charging.

Preferably, the first battery pack and the second battery pack respectively calculate a maximum charging current corresponding to the first battery pack and the second battery pack according to the sampled cell voltage and/or cell temperature and/or SOC capacity, and send the maximum charging current corresponding to the first battery pack and the second battery pack to the charger as a charging demand communication corresponding to the maximum charging current, and the charger calculates a target charging voltage of the battery pack according to the maximum charging current required by the charger, where the target charging voltage is used as a charging target of each battery pack during charging.

Preferably, the step of the charger adjusting the charging current of each battery pack by varying its output power based on the data of the communication interaction comprises: when the cell voltage difference value of a certain battery pack exceeds the cell voltage difference preset value, the charger reduces the charging current of the battery pack by reducing the corresponding output power until the cell voltage difference value is within the range of the cell voltage difference preset value, and automatically restores charging according to the charging requirement of the battery pack, so that the problem that the cells of each battery pack are over-voltage during charging is solved.

Preferably, the step of the charger adjusting the charging current of each battery pack by varying its output power based on the data of the communication interaction comprises: when the temperature of the battery core of a certain battery pack exceeds the preset range of the temperature of the battery core, the charger reduces the charging current of the battery pack by reducing the corresponding output power to the battery pack, so that the temperature of the battery core of the battery pack is reduced until the temperature of the battery core is within the preset range of the temperature of the battery core, the charging is automatically recovered according to the charging requirement of the battery pack, and the problem that the battery core of each battery pack is over-temperature when being charged is solved.

Preferably, the step of the charger adjusting the charging current of each battery pack by varying its output power based on the data of the communication interaction comprises: when the charger detects that the charging current of a certain battery pack exceeds a preset maximum value of the charging current, the MOS power switch tube of the battery pack is automatically closed to enter an overcurrent protection mode, so that the problem of overcurrent of battery cells of the battery packs during charging is avoided.

Preferably, the large and medium power electric vehicle is driven by a multi-module intelligent driving system, the charging control method of the multi-module intelligent driving system is the charging control method, and the power of the electric vehicle is not less than 1 KW.

Preferably, each battery pack adopts a ternary lithium battery.

The invention also provides a multi-module intelligent driving system of a large and medium power electric vehicle, which comprises a three-phase alternating current motor adopting at least 2 winding units and a motor driver unit correspondingly and electrically connected with each winding unit respectively, wherein each motor driver unit comprises a battery pack and a controller which are electrically connected, the controller discharges to the battery pack corresponding to the controller according to the power output requirement of the electric vehicle for working connection, the controller and the battery pack corresponding to the controller adopt bidirectional communication for interactive connection discharge control during discharge working, the communication interactive data comprises the discharge current, the cell voltage, the cell temperature and the SOC capacity of each battery pack, and the controller adjusts the discharge current of each battery pack by changing the output power of the controller based on the communication interactive data, the method is used for avoiding the problems of overcurrent and/or overtemperature and/or abnormal discharge of each battery pack cell during working discharge.

Preferably, each controller comprises an MCU and a control communication module; each battery pack comprises a plurality of battery cells and a battery management system, the battery management system comprises a battery single chip microcomputer, an MOS power switch tube and a battery communication module, the battery communication module and the control communication module are in bidirectional communication interactive connection, and the battery cells are in charging connection with the charger correspondingly.

Preferably, the step of the controller adjusting the discharge current of each battery pack by varying its output power based on the data of the communication interaction includes: when the temperature of the battery cell of a certain battery pack exceeds the preset range of the temperature of the battery cell, the controller corresponding to the battery pack reduces the discharge current of the battery pack by reducing the output power corresponding to the battery pack, so that the temperature of the battery cell of the battery pack is reduced until the temperature of the battery cell is within the preset range of the temperature of the battery cell, and the normal discharge work is automatically recovered according to the power output requirement of the electric vehicle, so that the problem that the battery cells of each battery pack are over-temperature during discharge in work is solved.

Preferably, the step of the controller adjusting the discharge current of each battery pack by varying its output power based on the data of the communication interaction includes: when a certain controller detects that the electric vehicle is in a non-running state and the discharge current of the battery pack corresponding to the controller exceeds a preset maximum value of static discharge current, the MOS power switch tube of the battery pack is automatically closed to enter an abnormal discharge protection mode, so that the problem of abnormal discharge of the battery cells of each battery pack is avoided.

Preferably, the step of the controller adjusting the discharge current of each battery pack by varying its output power based on the data of the communication interaction includes: when the controller detects that the electric vehicle is in a static state for more than the preset static protection time, the controller automatically closes the MOS power switch tube of the corresponding battery pack to enter an abnormal discharge protection mode, so as to avoid the problem of abnormal discharge of the battery cells of the battery packs.

Preferably, each battery pack adopts a ternary lithium battery.

Preferably, the power of the electric vehicle is not less than 1 KW.

Preferably, a single charger is used for charging at least 2 battery packs according to the charging requirement of the corresponding battery pack, when charging, the charger and each battery pack adopt bidirectional communication interactive connection charging control, the communication interactive data comprise the charging current, the cell voltage, the cell temperature and the SOC capacity of each battery pack, and the charger adjusts the charging current of each battery pack by changing the output power thereof based on the communication interactive data, so as to avoid the problems of overvoltage, overcurrent and/or overtemperature of each battery pack cell during charging.

Preferably, the multi-module intelligent driving system for the large and medium power electric vehicle is adopted.

Preferably, the electric vehicle is an electric motorcycle, and the maximum driving speed of the electric motorcycle is more than 60 Km/h.

The invention also provides a multi-module intelligent driving system of the electric vehicle, which comprises a three-phase alternating current motor adopting at least 2 winding units and motor driver units respectively and correspondingly electrically connected with the winding units, wherein each motor driver unit comprises a battery pack and a controller which are electrically connected, the charger comprises a high-voltage to low-voltage power supply module, a charging single chip microcomputer and a charging communication module, each battery pack comprises a plurality of battery cells and a battery management system, the battery management system comprises a battery single chip microcomputer, an MOS (metal oxide semiconductor) power switching tube and a battery communication module, the battery communication module and the charging communication module are in bidirectional communication interactive connection, the high-voltage to low-voltage power supply module and the battery cells are correspondingly in charging connection, and the communication interactive data comprise the charging current, the battery cell voltage, the battery cell temperature and the like of each battery pack, And/or SOC capacity of each battery pack.

Preferably, the charger and each battery pack are connected in a bidirectional communication and interaction manner through a wire or a wireless manner.

Preferably, the charger and each battery pack are interactively connected through bidirectional communication through buses respectively.

Preferably, each battery pack adopts a ternary lithium battery.

Preferably, a sensor is arranged in each battery pack and used for detecting the temperature of the battery cell; the charging current, the cell voltage and the SOC capacity are obtained by calculation after the battery single chip microcomputer samples; and simultaneously, the charging single chip microcomputer samples the charging current of each battery pack and carries out bidirectional communication interactive feedback with the charging current sampled by the battery single chip microcomputer.

Preferably, the maximum voltage range of each battery cell in each battery pack is 3V to 4.2V, the preset value of the voltage difference of the battery cells is not more than 0.2V, and the preset value of the voltage difference of the battery packs is not more than 3V.

Preferably, each controller comprises an MCU and a control communication module; each battery pack comprises a plurality of battery cells and a battery management system, each battery management system comprises a battery single chip microcomputer, an MOS power switch tube and a battery communication module, the battery communication module and the control communication module are in bidirectional communication interactive connection, and data of communication interaction comprise discharge current, battery cell voltage, battery cell temperature and SOC (state of charge) of each battery pack.

Preferably, the discharge current is obtained by calculation after sampling by the battery single chip microcomputer; and simultaneously, the controller samples the discharge current of the battery pack corresponding to the controller and performs bidirectional communication interactive feedback with the discharge current sampled by the battery single chip microcomputer.

Preferably, the electric vehicle adopts the electric vehicle multi-module intelligent driving system, and the power of the electric vehicle is not less than 1 KW.

Preferably, the electric vehicle is an electric motorcycle, and the maximum driving speed of the electric motorcycle is more than 60 Km/h.

Preferably, the battery packs related to the invention do not output current during storage and transportation, and avoid the danger caused by collision and accident.

Note that SOC in SOC capacity according to the present invention is an abbreviation of State of Charge, and means a State of Charge of a battery, which may also be referred to as a remaining capacity.

The invention has the advantages that:

the invention further develops the technical difficulties of charging and discharging management of the multi-battery pack on the basis of the technical scheme of the multi-module and multi-module intelligent driving system submitted in 2018, 9, 19 and 19, and comprises the following steps:

the invention creatively provides a safe charging control method for a plurality of battery packs by adopting a single charger, and particularly during charging, the charger and each battery pack adopt bidirectional communication interactive connection charging control, the communication interactive data comprises information such as charging current, cell voltage, cell temperature and SOC (state of charge) capacity of each battery pack, and the charger adjusts the charging current of each battery pack by changing the output power of the charger based on the communication interactive data, so as to avoid the problems of overvoltage, overcurrent, overtemperature and the like of each battery pack during charging, thereby realizing the optimal current and voltage control of charging of each battery pack cell, and forcefully avoiding how much the cell voltage difference is in the charging process of the multi-module intelligent driving system of the electric vehicle provided by the invention on the premise of ensuring the charging requirement of the battery packs, The potential safety hazard of charging caused by over-high temperature of the battery core.

The invention also creatively provides a safe discharge control method of the battery pack by adopting the controller, the controller is connected with the battery pack corresponding to the controller according to the power output requirement of the electric vehicle, particularly, the controller and the battery pack corresponding to the controller adopt bidirectional communication interactive connection discharge control during discharge operation, the communication interactive data comprises the discharge current, the cell voltage, the cell temperature and the SOC capacity of each battery pack, and the controller adjusts the discharge current of each battery pack by changing the output power thereof based on the communication interactive data, so as to avoid the problems of overcurrent, over-temperature and abnormal discharge during the operation discharge of each battery pack cell, which can be embodied in that: when discharging, each battery pack can confirm that the external state is not abnormal through bidirectional communication interaction with the controller and then enters a normal working state, and when the external state is abnormal, the battery pack does not discharge outwards, so that the danger caused by the abnormity of the whole vehicle parts such as short circuit, soft short circuit and the like is avoided; meanwhile, the controller is in bidirectional communication interaction with each battery pack, so that the discharge current and the battery temperature of each battery pack can be controlled according to the battery cell envelope curve of each battery pack, the service life of the battery is obviously prolonged, and the driving range of the whole vehicle is prolonged.

The invention also provides a structure of the multi-module intelligent driving system of the electric vehicle, the battery communication module of the battery management system in each battery pack is in bidirectional communication interactive connection with the charging communication module of the charger, and the high-voltage to low-voltage power supply module is in corresponding charging connection with the battery cell, so that the quick and reliable bidirectional communication interactive connection between each battery pack and the charger is realized, the structure is simple, and no extra installation space is occupied; meanwhile, the battery communication module of each battery pack is preferably connected with the control communication module of the corresponding controller in a bidirectional communication interaction manner, so that the quick and reliable bidirectional communication interaction connection between each battery pack and the corresponding controller is further realized, the structure is simple, and any extra installation space is not additionally occupied;

through experimental comparison tests, compared with the battery scheme of the medium-high power driving system in the prior art, the service life of the battery of the multi-module intelligent driving system provided by the invention can be prolonged by at least more than 50%.

Drawings

Fig. 1 is a schematic diagram of a connection structure of a multi-module intelligent driving system according to an embodiment of the present invention.

Detailed Description

The embodiment of the invention discloses a charging control method of a multi-module intelligent driving system of a large and medium power electric vehicle, the multi-module intelligent driving system of the large and medium power electric vehicle comprises a three-phase alternating current motor adopting at least 2 winding units and a motor driver unit respectively and correspondingly and electrically connected with each winding unit, each motor driver unit comprises a battery pack and a controller which are electrically connected, a single charger is adopted for charging at least 2 battery packs according to the charging requirement of the corresponding battery pack, during charging, the charger and each battery pack adopt bidirectional communication and interactive connection charging control, the communication and interactive data comprise the charging current, the battery cell voltage, the battery cell temperature and the SOC capacity of each battery pack, and the charger adjusts the charging current of each battery pack by changing the output power of the charger based on the communication and interactive data, the method is used for avoiding the problems of overvoltage and/or overcurrent and/or overtemperature of each battery pack cell during charging.

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Since the present application is a technical innovation on charge and discharge management based on the multi-module driving innovation technology proposed by the applicant in 2018, 9, and 19, the same embodiment is also applied in combination to further illustrate the technical effects of the present invention.

The embodiment provides an electric vehicle with large and medium power, which is driven by a multi-module intelligent driving system, and particularly in the embodiment, the electric vehicle is an electric motorcycle, the input power range of the electric motorcycle is 600W-10KW, more preferably, the input power range of the electric motorcycle is 1KW-10KW, the highest driving speed of the electric motorcycle is greater than 60Km/h, more preferably, the highest driving speed of the electric motorcycle can reach 70Km/h, even more than 80Km/h, under a higher driving speed range, the technical effect of the electric motorcycle that is intelligently driven by the multi-module intelligent driving system provided by the embodiment is better, and the electric motorcycle provided by the embodiment can directly compare favorably with a fuel motorcycle in power performance and riding experience;

referring to fig. 1, the multi-module intelligent driving system of the present embodiment includes a three-phase ac motor using 2 winding units, and a first motor driver unit and a second motor driver unit electrically connected to the winding units respectively, where the first motor driver unit includes a first battery pack and a first controller electrically connected to each other, and the second motor driver unit includes a second battery pack and a second controller electrically connected to each other;

specifically, in the present embodiment, the three-phase ac motor is a permanent magnet synchronous hub motor, wherein the specific structural design of the permanent magnet synchronous hub motor and each motor driver unit in the present embodiment can be completely described in the technical content of embodiment 1 in CN201811094649.9, and the present embodiment uses the entire technical content thereof as the implementation basis of the embodiments of the present application, so as to achieve the technical effect of multi-module intelligent driving, and in order to save the space of the specification, the detailed description is not further provided;

preferably, in the embodiment, the specification of each battery pack is 48V20AH, and the battery packs simultaneously work for guaranteeing a power source for intelligent driving of the permanent magnet synchronous hub motor, and particularly, in the embodiment, each battery pack adopts a ternary lithium battery, and the maximum discharge rate of each ternary lithium battery is less than or equal to 3C, so that a strong and stable energy guarantee is provided for a multi-module intelligent driving system of a large and medium power electric vehicle;

preferably, in this embodiment, the charger includes a high-voltage to low-voltage power supply module, a charging single chip, and a charging communication module, each battery pack includes a plurality of battery cells and a battery management system, the battery management system includes a battery single chip, an MOS power switching tube, and a battery communication module, the battery communication module and the charging communication module are interactively connected by bidirectional communication, and the high-voltage to low-voltage power supply module is correspondingly connected with the battery cells by charging; the charger and each battery pack are in bidirectional communication interactive connection through wires or wirelessly; each controller comprises an MCU and a control communication module; the battery communication module and the control communication module are in bidirectional communication interactive connection;

preferably, in this embodiment, the bidirectional communication interconnection includes a sending data communication connection TX and a receiving data communication connection RX, and the specific communication connection may adopt a wired communication manner such as uart or can bus, or may adopt a wireless communication manner such as bluetooth, GPRS, WIFI, or of course, other communication connection manners known to those skilled in the art may also be adopted; particularly preferably, in the present embodiment, the charger and each battery pack, and the controller and the corresponding battery pack are respectively connected to each other through a bus for bidirectional communication;

preferably, in this embodiment, in order to implement efficient and reliable bidirectional communication interactive connection, a sensor is disposed in each battery pack and is used for detecting a cell temperature; the charging current, the cell voltage and the SOC capacity are obtained by calculation after sampling by a battery single chip microcomputer; simultaneously, the charging single chip microcomputer samples the charging current of each battery pack and carries out bidirectional communication interactive feedback with the charging current sampled by the battery single chip microcomputer; the discharge current is obtained by calculation after being sampled by a battery single chip microcomputer; meanwhile, the controller samples the discharge current of the corresponding battery pack at the same time, and carries out bidirectional communication interactive feedback with the discharge current sampled by the battery single chip microcomputer;

in this embodiment, a charging control method for the multi-module intelligent driving system of the large and medium power electric vehicle is provided, where a single charger is used to charge at least 2 battery packs according to the charging requirement of the corresponding battery pack, preferably, in this embodiment, the charging requirement is determined according to the cell voltage and/or the cell temperature and/or the SOC capacity of each battery pack, and particularly preferably, the applicant proposes that, in implementation, the charging requirement is determined comprehensively according to the cell voltage, the cell temperature and the SOC capacity of each battery pack, because the charging and discharging characteristics of the secondary electrochemical battery are determined by the electrochemical characteristics of the battery itself, specifically, by the characteristics of the positive and negative electrode materials and the internal impedance parameters of the battery, and may be specifically represented by a charging (discharging) power-battery SOC capacity curve and a battery cell temperature characteristic curve of the battery, the present embodiment determines the charging requirement according to the battery data and the inherent characteristics thereof;

preferably, in this embodiment, the first battery pack and the second battery pack respectively calculate the maximum charging current corresponding to the first battery pack and the second battery pack according to the sampled cell voltage, cell temperature and SOC capacity, the specific calculation method adopts a known calculation method in the art, and sends the maximum charging current corresponding to the first battery pack and the second battery pack to the charger as the charging requirement communication corresponding to the first battery pack and the second battery pack, and the charger calculates the target charging voltage of the battery pack according to the maximum charging current corresponding to the charger, where the target charging voltage is used as the charging target of each battery pack during charging;

in this embodiment, when charging, the charger and each battery pack adopt bidirectional communication interactive connection charging control, the data of communication interaction includes the charging current of each battery pack, the cell voltage, the cell temperature of each battery pack, the SOC capacity of each battery pack, and may further include other data that need to be communicated and interacted according to the control development demand, which is not limited by the present application, and the charger adjusts the charging current of each battery pack by changing its output power based on the data of communication interaction, so as to avoid the problem of overvoltage and/or overcurrent and/or overtemperature occurring when each battery pack and cell is charging, thereby enabling this embodiment to realize the optimal current and voltage control for charging each battery pack and, on the premise of ensuring that each battery pack realizes the charging demand, effectively avoiding how large the cell voltage difference is in the charging process of the electric vehicle multi-module intelligent driving system of this embodiment, The potential safety hazard of charging caused by over-high temperature of the battery core;

preferably, in this embodiment, the communication interconnection charging control step includes:

s10), the charger respectively receiving charging demands from the first battery pack and the second battery pack, when the first battery pack or the second battery pack needs to be charged separately, proceeding to step S20), when the first battery pack and the second battery pack need to be charged simultaneously, proceeding to step S30);

s20), the charger charges the battery pack needing to be charged, and during charging, the charger adjusts the charging current of the battery pack by changing the output power of the charger based on the data of communication interaction, so as to avoid the problems of overvoltage and/or overcurrent and/or overtemperature of the battery cell during charging;

s30), judging whether the voltage difference value between the first battery pack and the second battery pack exceeds the preset voltage difference value of the battery packs, and when the voltage difference value exceeds the preset voltage difference value of the battery packs, entering the step S40), and when the voltage difference value does not exceed the preset voltage difference value of the battery packs, entering the step S50);

s40), charging the low-voltage battery pack according to the charging requirement of the low-voltage battery pack to improve the voltage of the low-voltage battery pack until the voltage difference value between the first battery pack and the second battery pack is within the preset range of the voltage difference value of the battery packs, and entering the step S50);

s50), charging the first battery pack and the second battery pack simultaneously, and adjusting the charging current of each battery pack by changing the output power of the charger based on the data of communication interaction during charging so as to avoid the problems of overvoltage, overcurrent and overtemperature of each battery pack cell during charging.

Specifically, in this embodiment, the process of adjusting the charging current of each battery pack by the charger includes the following charging conditions:

a1, when the voltage difference value of a certain battery pack cell exceeds the preset value of the voltage difference of the cell, the charger reduces the charging current of the battery pack by reducing the corresponding output power until the voltage difference value of the cell is within the range of the preset value of the voltage difference of the cell, and automatically restores the charging according to the charging requirement of the battery pack, so as to avoid the problem that the cell of each battery pack generates overvoltage during the charging;

a2, when the temperature of the battery cell of a certain battery pack exceeds the preset range of the temperature of the battery cell, the charger reduces the charging current of the battery pack by reducing the corresponding output power to the battery pack, so as to reduce the temperature of the battery cell of the battery pack until the temperature of the battery cell is within the preset range of the temperature of the battery cell, and automatically resumes charging according to the charging requirement of the battery pack, so as to avoid the problem that the battery cells of each battery pack are over-temperature during charging;

a3, when the charger detects that the charging current of a certain battery pack exceeds the preset maximum value of the charging current, automatically closing an MOS power switch tube (usually a main MOS tube) of the battery pack to enter an overcurrent protection mode, so as to avoid the problem of overcurrent during charging of battery cells of each battery pack; further preferably, in this embodiment, after a certain time (for example, 3 to 5 seconds) is selected, the MOS power switch tube (usually, the main MOS tube) of the battery pack is turned on, if a large charging current exceeding a preset maximum charging current limit is not detected, the normal charging is automatically resumed, if a large charging current is still detected, the MOS power switch tube of the battery pack is automatically turned off again, the number of times of restarting the MOS power switch tube of the battery pack at intervals may be further limited, if a large charging current is still detected for more than 3 times, it is determined that the electric vehicle is driven abnormally, and the charger is set to a protection state and is not charged any more.

The electric vehicle multi-module intelligent driving system provided by the embodiment also provides a safe discharge control method, and the adopted technical scheme is as follows:

the controller is connected with the corresponding battery pack in a discharging operation mode according to the power output requirement of the electric vehicle, during the discharging operation, the controller and the corresponding battery pack adopt bidirectional communication interactive connection discharging control, communication interactive data comprise discharging current, cell voltage, cell temperature and SOC (state of charge) capacity of each battery pack, and the controller adjusts the discharging current of each battery pack by changing the output power of the controller based on the communication interactive data, so that the problems of overcurrent, overtemperature and abnormal discharging of each battery pack cell during the discharging operation are solved; the positive technical effects are embodied as follows: when discharging, each battery pack can confirm that the external state is not abnormal through bidirectional communication interaction with the controller and then enters a normal working state, and when the external state is abnormal, the battery pack does not discharge outwards, so that the danger caused by the abnormity of the whole vehicle parts such as short circuit, soft short circuit and the like is avoided; meanwhile, the controller is in bidirectional communication interaction with each battery pack, so that the discharge current and the battery temperature of each battery pack can be controlled according to the battery cell envelope curve of each battery pack, the service life of the battery is obviously prolonged, and the driving range of the whole vehicle is prolonged;

specifically, in this embodiment, the process of adjusting the discharge current of each battery pack by the controller includes the following discharge conditions:

b1, when the temperature of the battery cell of a certain battery pack exceeds the preset range of the temperature of the battery cell, the controller corresponding to the certain battery pack reduces the discharge current of the battery pack by reducing the output power corresponding to the certain battery pack, so as to reduce the temperature of the battery cell of the battery pack until the temperature of the battery cell is within the preset range of the temperature of the battery cell, and the normal discharge work is automatically recovered according to the power output requirement of the electric vehicle, so that the problem of over-temperature of the battery cells of each battery pack during the work discharge is avoided;

b2, when a controller detects that the electric vehicle is in a non-running state and the discharge current of the battery pack corresponding to the controller exceeds a preset maximum value of static discharge current, automatically closing an MOS power switch tube of the battery pack to enter an abnormal discharge protection mode, wherein the abnormal discharge protection mode is used for avoiding the problem of abnormal discharge of battery cells of each battery pack;

and B3, when the controller detects that the electric vehicle is in a static state for more than the preset static protection time, automatically closing the MOS power switch tube of the corresponding battery pack to enter an abnormal discharge protection mode, so as to avoid the problem of abnormal discharge of the battery cells of the battery packs.

It should be noted that, in the implementation of the present application, various types of preset values in the control system are usually set in combination based on safety management requirements in practical application in the field and inherent characteristics of the battery, and preferably, in the present embodiment, the maximum voltage range of each battery cell in each battery pack is 3V to 4.2V, the preset value of the voltage difference of the battery cell is not greater than 0.2V, the preset value of the voltage difference of the battery pack is not greater than 3V, the preset range of the temperature of the battery cell is-10 to 55 ℃, the preset maximum limit value of the charging current is 40 to 50A, the preset maximum limit value of the static discharging current is 3 to 5A, and the preset static protection time is not less than 20 minutes; of course, the preferred ranges of these preset values are not set as limitations to the scope of the claims of the present application.

Comparative example: the other technical schemes of the comparative example are the same as the above embodiment, except that: in the present comparative example, the stator adopts a single winding unit, the single winding unit is electrically connected with a single motor driver, the battery pack of the single motor driver adopts two groups of 48V20 AH-sized batteries which are commonly used in the market, one group is used up and the other group is used up, and the specific motor and controller technical scheme of the present comparative example is directly referred to the content recorded in the prior patent application CN201811094649.9 comparative example 1.

In the comparative example, only one group of batteries works, the maximum discharge current in the heavy current discharge process exceeds 3C and the continuous operation current exceeds 2C during daily riding, the damage to the 20 AH-sized batteries is large, the service life of the batteries can be seriously shortened, the batteries are easy to heat, and potential safety hazards exist;

through comparison detection and verification performed inside the applicant, the service life of the battery pack of the embodiment can be prolonged by at least 50% compared with that of a single-group working battery scheme of a comparative example.

A person skilled in the art can also apply the proposed charging and discharging management scheme of the multi-module intelligent driving system of this embodiment to a motor drive having multiple winding units according to the need of control, for example, in other embodiments of the prior patent application CN201811094649.9, by obtaining similar technical effects to those of the embodiments of this application, the embodiments of this application are not described one by one.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.