CN110829627A

CN110829627A - Wireless charging method and system based on distribution

Info

Publication number: CN110829627A
Application number: CN201910931738.2A
Authority: CN
Inventors: 杨世春; 何红; 闫啸宇; 华旸; 陈宇航
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-02-21
Anticipated expiration: 2039-09-29
Also published as: CN110829627B

Abstract

The invention provides a wireless charging method and a system based on a distributed mode, wherein the system comprises a primary side device and a secondary side device, the secondary side device comprises a plurality of independent sub-battery packs which are distributed and respectively installed at different positions of an electric automobile, and independent secondary side receiving coils and battery management systems which are respectively connected with the sub-battery packs at the different positions, each independent secondary side receiving coil is matched with each primary side transmitting coil of the primary side device, and each battery management system is connected to a secondary side control unit; and the primary side control unit and the secondary side control unit are used for carrying out charging control and equalizing charging management of the battery. The system can realize the balanced management and the cooperative work of each sub-battery pack on the vehicle, reduce the electromagnetic radiation intensity in the charging process and improve the charging safety.

Description

Wireless charging method and system based on distribution

Technical Field

The invention relates to the field of electricity, in particular to a wireless charging method and system based on distribution.

Background

The wireless charging technology realizes wireless transmission of electric energy by means of microwaves, ultrasonic waves, laser, electromagnetic fields, electromagnetic waves and the like, and a power supply and a charging load are not in direct physical contact. Therefore, artificial plugging is not needed when charging is started and ended, electric shock danger is avoided, safety, convenience and reliability of a charging process are improved, meanwhile, the power source transmitting end and the load transmitting end are independently packaged, the power source transmitting end and the load transmitting end are suitable for severe weather and environments such as rain, and maintenance cost is greatly reduced. Wireless charging technologies can be divided into two categories according to energy transmission modes, one category is a coupling type wireless charging technology which needs a pair of coupled transmitting end and receiving end to carry out energy transmission, and the wireless charging modes belonging to the category specifically include an electromagnetic induction type, an electromagnetic resonance type and an electric field coupling type; the other type is a radiative wireless charging technology which takes radiation waves of various forms as carriers and can freely transmit energy in space, and the carriers of the energy respectively comprise ultrasonic waves, radio waves, microwaves, lasers and the like. The energy transmission distance of the coupling type electromagnetic induction wireless charging technology is dozens of centimeters, the working frequency is between dozens of kilohertz and hundreds of kilohertz, the transmission power can reach kilowatt level, and the efficiency can reach more than 90%. Based on the above characteristics of the electromagnetic induction type wireless charging technology, the industrial research and application are the most extensive, and the wireless charging technology which is the most mature in the electric vehicle is also used at present.

One of the difficulties in popularization and use of the existing wireless electromagnetic induction type wireless charging system for the electric vehicle is that since a power supply performs wireless charging on a load in a one-to-one manner, the energy transmission power is limited, and the existing quick charging technology can achieve a charging speed of about 1.6C (a constant current for fully discharging a battery in one hour is 1C), but is difficult to achieve a charging requirement of 5C or even 8C. Meanwhile, with the increase of power, the problem of electromagnetic radiation of the electromagnetic induction type wireless charging system is more serious, and the electromagnetic radiation with too high intensity can affect the safety of people around and other living beings and is difficult to meet the standard requirement of the electromagnetic radiation.

Disclosure of Invention

The invention provides a distributed wireless charging method, which aims to solve the technical problems that the load is wirelessly charged integrally in a one-to-one mode by a power supply in the prior art, the energy transmission power of the wireless charging method is limited, and the electromagnetic radiation problem of an electromagnetic induction type wireless charging system is more serious along with the increase of the power. The invention also relates to a wireless charging system based on the distribution.

The technical scheme of the invention is as follows:

a wireless charging system based on a distributed mode comprises a primary side device and a secondary side device, wherein the primary side device comprises an inversion unit, a primary side transmitting coil, a primary side circuit data acquisition module, a primary side communication module and a primary side control unit, and the secondary side device comprises a secondary side communication module and a secondary side control unit;

the battery management system is used for acquiring voltage information, current information, electric quantity information (SOC) and temperature information of a secondary side device within preset time and sending the voltage information, the current information, the electric quantity information (SOC) and the temperature information to the secondary side control unit, and the primary side circuit data acquisition module is used for acquiring voltage information, current information, temperature information and frequency information of the inversion unit of the primary side device within preset time and sending the voltage information, the current information, the temperature information and the frequency information to the primary side control unit; the primary side control unit and/or the secondary side control unit are/is respectively used for comparing the acquired voltage information, current information and temperature information of the circuit at the local side with the respective specified voltage threshold, current threshold and temperature threshold, judging whether the charging abnormal condition occurs or not, and sending fault information and ending the charging when the comparison result is that any one of the acquired voltage information, current information and temperature information of the circuit at the local side exceeds the specified corresponding threshold; when the comparison result shows that the voltage threshold, the current threshold and the temperature threshold are not exceeded, judging whether the communication module of the circuit at the side receives abnormal condition information sent by the communication module of the circuit at the opposite side, if so, receiving and displaying the abnormal condition information, and ending charging; if the abnormal condition information is not received, judging whether the electric quantity of the battery is fully charged through a battery management system, and if the electric quantity of the battery is fully charged, finishing charging; if the sub-battery packs are not fully charged, the battery management system sends the acquired electric quantity information (SOC) of each sub-battery pack to the secondary side control unit, the secondary side control unit sets a step electric quantity value to charge each sub-battery pack in stages so as to control all the distributed sub-battery packs to charge in a balanced mode for one period, and the primary side control unit adjusts the acquired frequency of the inverter unit so as to enable the primary and secondary side devices to transmit wireless energy until all the sub-battery packs are fully charged.

Further, the step electric quantity value set by the secondary control unit to charge each sub-battery pack in stages specifically means that:

the secondary side control unit groups the current electric quantity values of all the sub-battery packs according to the charging stages, the sub-battery packs with the current electric quantity values in the same charging stage are in a group, in the group of battery packs, when the electric quantity value of an independent sub-battery pack reaches the electric quantity upper limit of the current stage, the charging is stopped, the charging is continued when the electric quantity value of the independent sub-battery pack does not reach the electric quantity upper limit of the stage, the charging of the next stage is started when all the sub-battery packs reach the electric quantity upper limit of the stage, therefore, one period of balanced charging of all the distributed sub-battery packs is controlled, and the acquired frequency of the inversion unit is adjusted through the primary side control unit so that the original secondary side device can transmit wireless energy until all the sub-battery packs.

Further, the charging phase comprises: a trickle charge phase, a constant current charge phase and a constant voltage charge phase.

Further, the upper limit of the electric quantity of the current stage is between 0 and 1.

Further, the different positions of the electric automobile, where the sub-battery packs are installed in a distributed manner respectively, comprise a chassis, a rear seat and a top of the electric automobile.

Furthermore, the primary circuit data acquisition module continuously acquires the voltage information, the current information, the temperature information and the frequency information of the inversion unit of the primary device for a plurality of times at intervals of specific time; and/or the battery management system continuously acquires the voltage information, the current information, the temperature information and the electric quantity information (SOC) of the secondary side device for multiple times at specific time intervals, the primary side control unit and/or the secondary side control unit respectively compare the acquired voltage information, current information and temperature information of the circuit at the local side with respective specified corresponding threshold values, and when any one acquired information exceeds the specified corresponding threshold value, the primary side control unit and/or the secondary side control unit sends fault information and finishes charging; and when all the acquired information does not exceed the specified corresponding threshold value, judging whether the communication module of the circuit at the side receives the abnormal condition information sent by the communication module of the circuit at the opposite side.

A wireless charging method based on distribution is used for electromagnetic induction type wireless charging of an electric automobile, and is characterized by comprising the following steps:

the method comprises the steps of setting, namely dividing a battery pack carried by the whole electric automobile into a plurality of independent and distributed sub-battery packs, respectively mounting each sub-battery pack at different positions of the electric automobile, respectively setting independent energy receiving coils and battery management systems connected with each sub-battery pack at the different positions, matching each independent energy receiving coil with each energy transmitting coil of a primary side device, and connecting each battery management system to a secondary side control unit;

the method comprises the steps of collecting voltage information, current information, temperature information and frequency information of an inversion unit of a primary side device within preset time and sending the voltage information, the current information, the temperature information and the frequency information of the inversion unit to a primary side control unit; collecting voltage information, current information, temperature information and electric quantity information (SOC) of a secondary side device within preset time and sending the voltage information, the current information, the temperature information and the SOC to a battery management system;

an abnormality detection step, namely comparing the acquired voltage information, current information and temperature information of the local side circuit with the respective specified voltage threshold, current threshold and temperature threshold respectively through a primary side control unit and/or a secondary side control unit, judging whether an abnormal charging condition occurs, and sending fault information and ending charging when the comparison result is that any one of the acquired voltage information, current information and temperature information of the local side circuit exceeds the specified corresponding threshold; when the comparison result shows that the voltage threshold, the current threshold and the temperature threshold are not exceeded, judging whether the communication module of the circuit at the side receives abnormal condition information sent by the communication module of the circuit at the opposite side, if so, receiving and displaying the abnormal condition information, and ending charging; if the abnormal condition information is not received, entering a charging control step;

a charging control step, namely judging whether the electric quantity of the battery is full through a battery management system, and if so, ending charging; if the sub-battery packs are not fully charged, the battery management system sends the acquired electric quantity information (SOC) of each sub-battery pack to the secondary side control unit, the secondary side control unit sets a step electric quantity value to charge each sub-battery pack in stages so as to control all the distributed sub-battery packs to be charged in a balanced mode for one period, and the primary side control unit adjusts the acquired frequency of the inversion unit so as to enable the primary and secondary side devices to transmit wireless energy until all the sub-battery packs are fully charged.

Further, in the charging control step, the step electric quantity value set by the secondary control unit to charge each sub-battery pack in stages specifically means:

the method comprises the steps of grouping the current electric quantity values of all the sub-battery packs according to the charging stages, wherein the sub-battery packs with the current electric quantity values in the same charging stage are in one group, stopping charging when the electric quantity value of an independent sub-battery pack reaches the electric quantity upper limit of the current stage, continuing charging when the electric quantity value of the independent sub-battery pack does not reach the electric quantity upper limit of the stage, and starting charging in the next stage when all the sub-battery packs reach the electric quantity upper limit of the stage, so that the distributed sub-battery packs are controlled to be charged in a balanced mode for one period, and the obtained frequency of an inverter unit is adjusted through a primary side control unit so that a primary side device can transmit wireless energy until all the sub-battery packs are fully charged.

Furthermore, the acquisition step continuously acquires the voltage information, the current information, the temperature information and the frequency information of the inversion unit of the primary side device for a plurality of times at specific time intervals; and/or the acquisition step continuously acquires the voltage information, the current information, the temperature information and the electric quantity information (SOC) of the secondary side device for multiple times at specific time intervals, the abnormality detection step compares the acquired voltage information, current information and temperature information of the circuit at the current side with respective specified corresponding threshold values, and when any one acquired information exceeds the specified corresponding threshold value, the abnormality detection step sends fault information and ends charging; and when all the acquired information does not exceed the specified corresponding threshold value, judging whether the communication module of the circuit at the side receives the abnormal condition information sent by the communication module of the circuit at the opposite side.

The invention has the following technical effects:

the invention provides a wireless charging system based on a distributed mode, which comprises a primary side device and a secondary side device, wherein the primary side device comprises an inversion unit, a primary side transmitting coil, a primary side circuit data acquisition module, a primary side communication module and a primary side control unit, the secondary side device comprises a secondary side communication module and a secondary side control unit, the secondary side device also comprises a plurality of independent sub-battery packs which are distributed and respectively arranged at different positions of an electric automobile (the secondary side device can be understood as dividing a battery pack carried by the existing electric automobile into a plurality of independent and distributed sub-battery packs, and each sub-battery pack is respectively arranged at different positions of the electric automobile), the independent secondary receiving coils and the battery management systems are respectively connected with the sub-battery packs at different positions, the independent secondary receiving coils are matched with the primary emitting coils of the primary device, and the battery management systems are connected to the secondary control unit; the battery management system is used for acquiring voltage information, current information, electric quantity information (SOC) and temperature information of the secondary side device within preset time and sending the voltage information, the current information, the electric quantity information (SOC) and the temperature information to the secondary side control unit, and the primary side circuit data acquisition module is used for acquiring voltage information, current information, temperature information and frequency information of the inversion unit of the primary side device within preset time and sending the voltage information, the current information, the temperature information and the frequency information to the primary side control unit; the primary side control unit and/or the secondary side control unit are respectively used for comparing the acquired voltage information, current information and temperature information of the circuit at the local side with the respective specified voltage threshold, current threshold and temperature threshold, judging whether the charging abnormal condition occurs, and sending fault information and ending charging when the comparison result is that any one of the acquired voltage information, current information and temperature information of the circuit at the local side exceeds the specified corresponding threshold; when the comparison result shows that the voltage threshold, the current threshold and the temperature threshold are not exceeded, judging whether the communication module of the circuit at the side receives abnormal condition information sent by the communication module of the circuit at the opposite side, if so, receiving and displaying the abnormal condition information, and ending charging; if the abnormal condition information is not received, judging whether the electric quantity of the battery is fully charged through a battery management system, and if the electric quantity of the battery is fully charged, finishing charging; if the sub-battery packs are not fully charged, the battery management system sends the acquired electric quantity information (SOC) of each sub-battery pack to the secondary side control unit, the secondary side control unit sets a step electric quantity value to charge each sub-battery pack in stages so as to control the sub-battery packs to be charged in a balanced mode for one period, and the primary side control unit adjusts the acquired frequency of the inverter unit so as to enable the primary and secondary side devices to transmit wireless energy until all the sub-battery packs are fully charged. According to the invention, the independent battery packs are arranged at different positions of the target equipment to be charged, so that the high-power quick charging of the whole target equipment to be charged can be realized through the quick charging of each independent sub-battery pack, and meanwhile, because the charging power of each independent sub-battery pack is smaller than the charging power required by the whole large battery pack, the electromagnetic radiation intensity in the charging process can be effectively reduced while the charging power of a vehicle is greatly improved, the influence on the safety of people and other living beings around is avoided, and the charging safety is improved. In the charging process, the primary side control unit and the secondary side control unit judge whether the charging abnormal condition occurs and process by monitoring whether the current, the voltage and the temperature value of the circuit at the side exceed the threshold value. The secondary side control unit carries out staged charging on each sub-battery pack by monitoring the electric quantity information (SOC) of each sub-battery pack and setting a step SOC value, namely, the charging is stopped when the SOC value of each sub-battery pack reaches the electric quantity upper limit of the current stage, the charging of the next stage is carried out until all sub-battery packs reach the electric quantity, and all sub-battery packs are fully charged, so that the balanced charging of all distributed sub-battery packs is realized, the balanced management and the cooperative work of all vehicle-mounted sub-battery packs are realized, and the high-power quick charging of the vehicle-mounted battery is realized by simultaneously carrying out wireless charging on a plurality of vehicle-mounted distributed sub-battery packs.

Further, the step electric quantity value set by the secondary side control unit to charge each sub-battery pack in stages specifically means that: the secondary side control unit groups the current electric quantity values of all the sub-battery packs according to the charging stages, the sub-battery packs with the current electric quantity values in the same charging stage are in one group, in one group of battery packs, when the electric quantity value of an independent sub-battery pack reaches the electric quantity upper limit of the current stage, the charging is stopped, the charging which does not reach the electric quantity upper limit of the stage is continued, when all the sub-battery packs reach the electric quantity upper limit of the stage, the charging of the next stage is started, therefore, all the distributed sub-battery packs are controlled to be charged in a balanced mode for one period, and the obtained frequency of the inversion unit is adjusted through the primary side control unit so that the original secondary side device can transmit wireless energy until all the sub-battery packs are fully charged. According to the invention, through carrying out the equalization management operation of the electric quantity on the battery packs in the same charging stage, the consistency of the electric quantity of each independent battery pack in the same charging stage can be realized, and the management of each independent battery pack is convenient.

Further, the charging phase comprises: a trickle charge phase, a constant current charge phase and a constant voltage charge phase. The invention can realize the consistency of the electric quantity of each independent battery pack in the same charging stage by carrying out the equalization management operation of the electric quantity on the battery packs in the same charging stage, such as the trickle charging stage or the constant-current charging stage or the constant-voltage charging stage at the same time, thereby facilitating the management of each independent battery pack.

Further, the upper limit of the electric quantity at the current stage is between 0 and 1. The invention can set the stage SOC value by setting the subsection charging electric quantity in advance, the stage SOC value is between 0 and 1, when the SOC value is 0, the charging is not started, and when the SOC value is 1, the full charging is indicated. The SOC value of the stage is set from 0 to 1, namely normalization processing is carried out, the difficulty of electric quantity calculation processing is reduced, electric quantity balance management can be conveniently carried out, the electric quantity balance consistency of each independent battery pack is guaranteed, therefore, the electric quantity of the battery is utilized to the maximum, and the service life of the battery is prolonged.

Further, the different positions of the electric automobile where the sub-battery packs are distributed and respectively installed comprise a chassis, a rear seat and a top of the electric automobile. The invention divides a large battery pack of the whole electric automobile into small battery packs positioned at different positions of a chassis, a rear seat and the top of the electric automobile, thereby realizing high-power quick charging of a vehicle-mounted battery.

Furthermore, the primary circuit data acquisition module continuously acquires the voltage information, the current information, the temperature information and the frequency information of the inversion unit of the primary device for a plurality of times at intervals of specific time; and/or the battery management system continuously collects the voltage information, the current information, the temperature information and the electric quantity information (SOC) of the secondary side device for a plurality of times at intervals of specific time, the primary side control unit and/or the secondary side control unit respectively compare the collected voltage information, current information and temperature information of the circuit at the side of the battery with respective specified corresponding threshold values, and when any one piece of collected information exceeds the specified corresponding threshold value, the primary side control unit and/or the secondary side control unit sends fault information and finishes charging; and when all the acquired information does not exceed the specified corresponding threshold value, judging whether the communication module of the circuit at the side receives the abnormal condition information sent by the communication module of the circuit at the opposite side. According to the invention, data of the primary side device or the secondary side device are continuously acquired for many times at specific time intervals, when any one acquired information exceeds the specified corresponding threshold value, the abnormal condition is judged, and when all acquired information does not exceed the specified corresponding threshold value, whether the abnormal condition information sent by the communication module of the opposite side circuit is received is judged, so that the influence on the normal charging process caused by the misjudgment of the system due to the distortion and the acquisition error of individual data is avoided, and the reliability of the system is improved.

The invention provides a distributed wireless charging method for electromagnetic induction type wireless charging of an electric vehicle, which corresponds to the distributed wireless charging system and can be understood as a method for realizing the distributed wireless charging system. The wireless charging method comprises the following steps: the method comprises the steps of setting, dividing a battery pack carried by the whole electric automobile into a plurality of independent and distributed sub-battery packs, respectively installing each sub-battery pack at different positions of the electric automobile, respectively setting independent energy receiving coils and battery management systems connected with each sub-battery pack at different positions, matching each independent energy receiving coil (namely a secondary side receiving coil) with each energy transmitting coil (namely a primary side transmitting coil) of a primary side device, and connecting each battery management system to a secondary side control unit; the method comprises the steps of collecting voltage information, current information, temperature information and frequency information of an inversion unit of a primary side device within preset time and sending the voltage information, the current information, the temperature information and the frequency information of the inversion unit to a primary side control unit; collecting voltage information, current information, temperature information and electric quantity information (SOC) of a secondary side device within preset time and sending the voltage information, the current information, the temperature information and the SOC to a battery management system; an abnormality detection step, namely comparing the acquired voltage information, current information and temperature information of the local side circuit with the respective specified voltage threshold, current threshold and temperature threshold respectively through a primary side control unit and/or a secondary side control unit, judging whether an abnormal charging condition occurs, and sending fault information and ending charging when the comparison result is that any one of the acquired voltage information, current information and temperature information of the local side circuit exceeds the specified corresponding threshold; when the comparison result shows that the voltage threshold, the current threshold and the temperature threshold are not exceeded, judging whether the communication module of the circuit at the side receives abnormal condition information sent by the communication module of the circuit at the opposite side, if so, receiving and displaying the abnormal condition information, and ending charging; if the abnormal condition information is not received, entering a charging control step; a charging control step, namely judging whether the electric quantity of the battery is full through a battery management system, and if so, ending charging; if the sub-battery packs are not fully charged, the battery management system sends the acquired electric quantity information (SOC) of each sub-battery pack to the secondary side control unit, the secondary side control unit sets a step electric quantity value to charge each sub-battery pack in stages so as to control all the distributed sub-battery packs to be charged in a balanced mode for one period, and the primary side control unit adjusts the acquired frequency of the inversion unit so as to enable the primary and secondary side devices to transmit wireless energy until all the sub-battery packs are fully charged. According to the invention, the independent battery packs are arranged at different positions of the target equipment to be charged, so that the high-power quick charging of the whole target equipment to be charged can be realized through the quick charging of each independent sub-battery pack, and meanwhile, the charging efficiency of each independent sub-battery pack is smaller than the charging power required by the whole large battery pack, so that the electromagnetic radiation intensity in the charging process is effectively reduced, the influence on the safety of surrounding people and other living beings is avoided, and the charging safety is improved.

Further, in the charging control step, the step electric quantity value set by the secondary control unit to charge each sub-battery pack in stages specifically means that: the method comprises the steps of grouping the current electric quantity values of all the sub-battery packs according to the charging stages, wherein the sub-battery packs with the current electric quantity values in the same charging stage are in one group, stopping charging when the electric quantity value of an independent sub-battery pack reaches the electric quantity upper limit of the current stage, continuing charging when the electric quantity value of the independent sub-battery pack does not reach the electric quantity upper limit of the stage, and starting charging in the next stage when all the sub-battery packs reach the electric quantity upper limit of the stage, so that the distributed sub-battery packs are controlled to be charged in a balanced mode for one period, and the obtained frequency of an inverter unit is adjusted through a primary side control unit so that a primary side device can transmit wireless energy until all the sub-battery packs are fully charged. According to the invention, through carrying out the equalization management operation of the electric quantity on the battery packs in the same charging stage, the consistency of the electric quantity of each independent battery pack in the same charging stage can be realized, and the management of each independent battery pack is convenient.

Furthermore, in the acquisition step, the voltage information, the current information, the temperature information and the frequency information of the inversion unit of the primary side device are continuously acquired for multiple times at specific time intervals; and/or the acquisition step continuously acquires the voltage information, the current information, the temperature information and the electric quantity information (SOC) of the secondary side device for multiple times at specific time intervals, the abnormity detection step compares the acquired voltage information, current information and temperature information of the circuit at the side of each time with respective specified corresponding threshold values, and when any one acquired information exceeds the specified corresponding threshold value, the abnormity detection step sends fault information and ends charging; and when all the acquired information does not exceed the specified corresponding threshold value, judging whether the communication module of the circuit at the side receives the abnormal condition information sent by the communication module of the circuit at the opposite side. According to the invention, data of the primary side device or the secondary side device are continuously acquired for many times at specific time intervals, when any one acquired information exceeds the specified corresponding threshold value, the abnormal condition is judged, and when all acquired information does not exceed the specified corresponding threshold value, whether the abnormal condition information sent by the communication module of the opposite side circuit is received is judged, so that the influence on the normal charging process caused by the misjudgment of the system due to the distortion and the acquisition error of individual data is avoided, and the reliability of the system is improved.

Drawings

Fig. 1 is a schematic block diagram of a distributed wireless charging system according to the present invention.

Fig. 2 is a flowchart of a distributed wireless charging method according to the present invention.

Fig. 3 is a flow chart of primary side (or secondary side) abnormal condition detection and processing based on a distributed wireless charging system according to the present invention.

Fig. 4 is a flowchart illustrating a charging control of the secondary side N distributed battery packs of the distributed wireless charging system according to the present invention.

Detailed Description

The technical scheme of the invention is explained in detail in the following with the accompanying drawings.

The invention provides a wireless charging system based on a distributed mode, which comprises a primary side device and a secondary side device, wherein as shown in figure 1, the primary side device comprises a power supply 1, a primary side transmitting coil (primary

side transmitting coils

1, 2, 3.. N marked by reference numerals 2, 4, 6 and 8), a primary side circuit data acquisition module (not shown in the figure), an inversion unit (

inversion units

1, 2, 3.. N marked by reference numerals 3, 5, 7 and 9), a primary side control unit 10 and a primary side communication module 11, the secondary side device comprises sub-battery packs (

sub-battery packs

1, 2, 3.. N marked by

reference numerals

15, 19, 23 and 27) which are respectively arranged at different positions of an electric automobile in a distributed mode, and independent battery management systems (

BMS

1, 2, BMS 8926 marked by

reference numerals

14, 18, 22 and 26) which are respectively connected with the corresponding sub-battery packs at the different positions, 3.. N), a rectifier module (

rectifier modules

1, 2, 3.. N denoted by

reference numerals

13, 17, 21, 25), a secondary side receiver coil (secondary side receiver coils 1, 2, 3.. N denoted by

reference numerals

12, 16, 20, 24), and a secondary side control unit 28 and a secondary side communication module 29. Since there are a plurality of primary

side transmitting coils

1, 2, 3.. N,

inverter units

1, 2, 3.. N,

sub-battery packs

1, 2, 3.. N,

rectifier modules

1, 2, 3.. N, Battery Management Systems (BMS)1, 2, 3.. N, and secondary

side receiving coils

1, 2, 3.. N, only the first group of components shown in fig. 1, which are electromagnetically induced and matched with each other, are taken as an example for description, and are respectively represented as follows: a primary side transmitting coil 1 denoted by reference numeral 2, an inverter unit 1 denoted by reference numeral 3, a sub-battery pack 1 denoted by reference numeral 15, a rectifier module 1 denoted by reference numeral 13, a BMS1 denoted by reference numeral 14, and a secondary side receiving coil 1 denoted by reference numeral 12. That is, the secondary side device includes a plurality of independent and distributed

sub-battery packs

1, 2, 3.. N respectively installed at different positions of the electric vehicle (it can be understood that the battery pack carried by the existing electric vehicle is divided into a plurality of independent and distributed sub-battery packs, each of which is installed at different positions of the electric vehicle), and independent secondary

side receiving coils

1, 2, 3.. N and Battery Management Systems (BMS)1, 2, 3.. N respectively connected to each of the sub-battery packs at the different positions, each of the independent secondary

side receiving coils

1, 2, 3.. N is matched with each of the primary

side transmitting coils

1, 2, 3.. N of the primary side device, and each of the battery management systems is connected to the secondary side control unit 28; the battery management system is used for acquiring voltage information, current information, electric quantity information (SOC) and temperature information of the secondary side device within a preset time and sending the voltage information, the current information, the electric quantity information (SOC) and the temperature information to the secondary side control unit 28, and the primary side circuit data acquisition module is used for acquiring voltage information, current information, temperature information and frequency information of the inversion unit 3 of the primary side device within a preset time and sending the voltage information, the current information, the temperature information and the frequency information to the primary side control unit 10; the primary side control unit 10 and/or the secondary side control unit 28 are respectively configured to compare the acquired voltage information, current information, and temperature information of the local side circuit with respective specified voltage threshold, current threshold, and temperature threshold, determine whether an abnormal charging condition occurs, and send fault information and end charging when a comparison result indicates that any one of the acquired voltage information, current information, and temperature information of the local side circuit exceeds a specified corresponding threshold; when the comparison result shows that the voltage threshold, the current threshold and the temperature threshold are not exceeded, judging whether the communication module of the circuit at the side receives abnormal condition information sent by the communication module of the circuit at the opposite side, if so, receiving and displaying the abnormal condition information, and ending charging; if the abnormal condition information is not received, judging whether the electric quantity of the battery is fully charged through a battery management system, and if the electric quantity of the battery is fully charged, finishing charging; if the sub-battery packs are not fully charged, the battery management system sends the acquired electric quantity information (SOC) of each sub-battery pack to the secondary control unit 28, the secondary control unit 28 sets a step electric quantity value to charge each sub-battery pack in stages so as to control all the distributed sub-battery packs to charge in an equalizing mode for one period, and the primary control unit 10 adjusts the acquired frequency of the inverter unit 3 so as to enable the primary and secondary devices to transmit wireless energy until all the sub-battery packs are fully charged.

Specifically, a Battery Management System (BMS) is connected to the sub-battery pack and the sub-side control unit, collects information of the sub-battery pack and sends the information to the sub-side control unit 28 for the sub-side control unit 28 to make a decision, mainly aims to improve the utilization rate of the battery, prevents the battery from being overcharged and overdischarged, and can be used for electric vehicles, battery cars and the like. The high-frequency electric energy transmitted to the secondary side can charge the sub-battery pack only after being rectified by the rectifying module, and the rectifying

modules

1, 2 and 3.

Based on the embodiment of the invention, the independent sub-battery packs are arranged at different positions of the target equipment to be charged, so that the high-power quick charging of the whole target equipment to be charged can be realized by quickly charging each independent sub-battery pack, and meanwhile, because the charging power of each independent sub-battery pack is smaller than the charging power required by the whole large battery pack, the electromagnetic radiation intensity in the charging process can be effectively reduced while the vehicle charging power is greatly improved, the influence on the safety of people around and other living beings is avoided, and the charging safety is improved. In the charging process, the primary side control unit and the secondary side control unit judge whether the charging abnormal condition occurs and process by monitoring whether the current, the voltage and the temperature value of the circuit at the side exceed the threshold value. The secondary side control unit carries out staged charging on each sub-battery pack by monitoring the electric quantity information (SOC) of each sub-battery pack and setting a step SOC value, namely, the charging is stopped when the SOC value of each sub-battery pack reaches the electric quantity upper limit of the current stage, the charging of the next stage is carried out until all sub-battery packs reach the electric quantity, and all sub-battery packs are fully charged, so that the balanced charging of all distributed sub-battery packs is realized, the balanced management and the cooperative work of all vehicle-mounted sub-battery packs are realized, and the high-power quick charging of the vehicle-mounted battery is realized by simultaneously carrying out wireless charging on a plurality of vehicle-mounted distributed sub-battery packs.

In an embodiment of the present invention, the step charging value set by the secondary control unit 28 to each

sub-battery pack

1, 2, 3.. N in stages specifically refers to: the secondary side control unit 28 groups the current electric quantity values of the

sub-battery packs

1, 2, 3.. N according to the charging stages, the sub-battery packs with the current electric quantity values in the same charging stage are in a group, in a group of battery packs, when the electric quantity value of an independent sub-battery pack reaches the electric quantity upper limit of the current stage, the charging is stopped, the charging is continued until the electric quantity upper limit of the stage is not reached, and when all the sub-battery packs reach the electric quantity upper limit of the stage, the charging of the next stage is started, so that the balanced charging of all the distributed sub-battery packs is controlled for one period, and the acquired frequency of the inverter unit is adjusted by the primary side control unit 10 so that the primary and secondary side device can transmit wireless energy until all the sub-battery packs are fully charged. For example, setting the range of the electric quantity values of all the sub-battery packs in the same charging stage as [ sk-1, sk ], stopping charging the battery pack when the electric quantity value of an independent sub-battery pack first reaches sk, restarting charging all the sub-battery packs in the charging stage when the energy of all the sub-battery packs in the charging stage reaches sk, entering the next charging stage, setting the range of the electric quantity values of all the battery packs in the stage as [ sk, sk +1], stopping charging the battery pack until the electric quantity of all the battery packs in the stage reaches sk +1 when the electric quantity value of an independent battery pack first reaches sk +1, and restarting charging all the sub-battery packs in the stage; this is repeated until all the sub-battery packs are fully charged.

Based on the embodiment of the invention, the electric quantity of each independent battery pack in the same charging stage can be consistent by performing the balanced management operation on the electric quantity of the battery packs in the same charging stage, and the management on each independent battery pack is convenient.

In an embodiment of the present invention, the charging stage includes: a trickle charge phase, a constant current charge phase and a constant voltage charge phase.

It should be noted that the whole charging process can be divided into trickle charging, constant current charging and constant voltage charging according to the voltage across the load (battery) from low to high. The trickle charge state is to charge the load with the minimum charging current, considering that if the battery in the load is sufficiently discharged, its open circuit voltage is low, which may cause the current of the initial charge to be too high, easily damaging the battery in the load. And the small current is used for charging a certain amount of electricity into the battery, so that the open-circuit voltage of the fully discharged battery can be rapidly increased, and the condition is avoided. Its main effect is to prolong the service life of the battery and to improve the safety during the charging process. The constant current charging stage is a relatively important stage in the whole charging process, namely, the constant current charging stage charges the battery with constant charging current, and the constant current charging stage finishes about 70% of capacity charging to realize the transition of the battery from a low-power state to a state close to a slow point. Its main effect is to charge the battery quickly and shorten the charging time. The constant voltage charging stage charges the battery with a constant charging voltage, and the charging current gradually decreases as the battery voltage increases. Its function is to maximize the safety of charging and the fullness of the battery. The upper limit electric quantity threshold values of the electric quantity intervals preset by each charging mode are respectively a preset trickle upper limit electric quantity threshold value (SOC1), a preset constant current upper limit electric quantity threshold value (SOC2) and a preset constant voltage upper limit electric quantity threshold value (SOC3), and the SOC1< SOC2< SOC 3.

Based on the embodiment of the invention, the battery packs in the same charging stage, such as the trickle charging stage at the same time or the constant-current charging stage at the same time or the constant-voltage charging stage at the same time, are subjected to the equalization management operation of the electric quantity, so that the consistency of the electric quantity of each independent battery pack in the same charging stage can be realized, the management of each independent battery pack is convenient, and therefore, the quick charging technology based on the distributed wireless charging method can realize the safe and efficient charging of the equipment to be charged, ensures the equalization of the electric quantity of each independent battery pack, maximizes the electric quantity of the battery, and prolongs the service life of the battery.

In one embodiment of the invention, the upper limit of the current stage charge is between 0 and 1.

Based on the embodiment of the invention, the invention can set the stage SOC value by setting the sectional charging electric quantity in advance, the stage SOC value is between 0 and 1, when the SOC value is 0, the charging is not started, and when the SOC value is 1, the full charging is indicated. The SOC value of the stage is set from 0 to 1, namely normalization processing is carried out, the difficulty of electric quantity calculation processing is reduced, electric quantity balance management can be conveniently carried out, the electric quantity balance consistency of each independent battery pack is guaranteed, therefore, the electric quantity of the battery is utilized to the maximum, and the service life of the battery is prolonged.

In one embodiment of the invention, the different positions of the electric vehicle where the sub-battery packs are distributed and respectively installed comprise a chassis, a rear seat and a top of the electric vehicle.

Based on the embodiment of the invention, a large battery pack of the whole electric automobile is divided into small battery packs positioned at different positions of a chassis, a rear seat and the top of the electric automobile, so that high-power quick charging of a vehicle-mounted battery is realized, and meanwhile, as the power of a single wireless energy transmission module is relatively small, the charging power of the automobile can be greatly improved, the electromagnetic radiation intensity is effectively reduced, and the charging safety is improved.

In one embodiment of the invention, the primary circuit data acquisition module continuously acquires the voltage information, the current information, the temperature information and the frequency information of the inversion unit of the primary device for a plurality of times at intervals of a specific time; and/or the battery management system continuously collects the voltage information, the current information, the temperature information and the electric quantity information (SOC) of the secondary side device for a plurality of times at intervals of specific time, the primary side control unit 10 and/or the secondary side control unit 28 respectively compares the voltage information, the current information and the temperature information of the circuit at the side collected each time with the respective specified corresponding threshold value, and when any one piece of collected information exceeds the specified corresponding threshold value, the fault information is sent and the charging is finished; and when all the acquired information does not exceed the specified corresponding threshold value, judging whether the communication module of the circuit at the side receives the abnormal condition information sent by the communication module of the circuit at the opposite side, and performing corresponding charging control according to whether the abnormal condition information exists.

Based on the embodiment of the invention, the data of the primary side device or the secondary side device are continuously acquired for many times at specific time intervals, when any one acquired information exceeds the specified corresponding threshold value, the abnormal condition is judged, and when all the acquired information does not exceed the specified corresponding threshold value, whether the abnormal condition information sent by the communication module of the opposite side circuit is received is judged, so that the influence on the normal charging process caused by the misjudgment of the system due to the distortion and the acquisition error of individual data is avoided, and the reliability of the system is improved.

The present invention also provides a wireless charging method based on distributed type, which corresponds to the wireless charging system based on distributed type and can be implemented by the cooperative work of each module in the primary side device and the secondary side device in the wireless charging system, as shown in fig. 2, the method includes:

step S10 is set, a battery pack carried by the whole electric automobile is divided into a plurality of independent and distributed sub-battery packs, each sub-battery pack is respectively installed at different positions of the electric automobile and is respectively provided with an independent energy receiving coil and a battery management system which are connected with each sub-battery pack at the different positions, each independent energy receiving coil is matched with each energy transmitting coil of the primary side device, and each battery management system is connected to the secondary side control unit;

an acquisition step S20, acquiring voltage information, current information, temperature information and frequency information of an inversion unit of a primary side device within a preset time and sending the voltage information, the current information, the temperature information and the frequency information of the inversion unit to a primary side control unit; collecting voltage information, current information, temperature information and electric quantity information (SOC) of a secondary side device within preset time and sending the voltage information, the current information, the temperature information and the SOC to a battery management system;

an abnormality detection step S30, in which the primary side control unit and/or the secondary side control unit respectively compare the acquired voltage information, current information, and temperature information of the local side circuit with the respective specified voltage threshold, current threshold, and temperature threshold, and determine whether an abnormal charging condition occurs, and when the comparison result indicates that any one of the acquired voltage information, current information, and temperature information of the local side circuit exceeds the specified corresponding threshold, send failure information and end charging; when the comparison result shows that the voltage threshold, the current threshold and the temperature threshold are not exceeded, judging whether the communication module of the circuit at the side receives abnormal condition information sent by the communication module of the circuit at the opposite side, if so, receiving and displaying the abnormal condition information, and ending charging; if the abnormal situation information is not received, the process proceeds to a charging control step S40;

a charging control step S40, judging whether the battery is fully charged through the battery management system, if so, ending the charging; if the sub-battery packs are not fully charged, the battery management system sends the acquired electric quantity information (SOC) of each sub-battery pack to the secondary side control unit, the secondary side control unit sets a step electric quantity value to charge each sub-battery pack in stages so as to control all the distributed sub-battery packs to be charged in a balanced mode for one period, and the primary side control unit adjusts the acquired frequency of the inversion unit so as to enable the primary and secondary side devices to transmit wireless energy until all the sub-battery packs are fully charged.

Based on the embodiment of the invention, the independent battery packs are arranged at different positions of the target equipment to be charged, so that the high-power quick charging of the whole target equipment to be charged can be realized by quickly charging each independent sub-battery pack, and meanwhile, because the charging efficiency of each independent sub-battery pack is smaller than the charging power required by the whole large battery pack, the electromagnetic radiation intensity in the charging process is effectively reduced, the influence on the safety of people around and other organisms is avoided, and the charging safety is improved.

In an embodiment of the present invention, in the charging control step S40, the step electric quantity value set by the secondary control unit 28 to charge each

sub-battery pack

1, 2, 3.. N in stages specifically means: the method comprises the steps of grouping the current electric quantity values of all the sub-battery packs according to the charging stages, wherein the sub-battery packs with the current electric quantity values in the same charging stage are in one group, stopping charging when the electric quantity value of an independent sub-battery pack reaches the electric quantity upper limit of the current stage, continuing charging when the electric quantity value of the independent sub-battery pack does not reach the electric quantity upper limit of the stage, and starting charging in the next stage when all the sub-battery packs reach the electric quantity upper limit of the stage, so that the distributed sub-battery packs are controlled to be charged in a balanced mode for one period, and the obtained frequency of an inverter unit is adjusted through a primary side control unit 10 to facilitate wireless energy transmission of a primary side device and a secondary side device until all the sub-battery. Specifically, for example, setting the range of the electric quantity values of all the sub-battery packs in the same charging phase as [ sk-1, sk ], when the electric quantity value of an independent sub-battery pack first reaches sk, stopping charging the battery pack, when the energy of all the sub-battery packs in the charging phase reaches sk, restarting charging all the sub-battery packs in the charging phase, entering the next charging phase, and when the electric quantity value of all the battery packs in the phase first reaches sk +1, stopping charging the battery pack until the electric quantity of all the battery packs in the phase reaches sk +1, restarting charging all the sub-battery packs in the phase; this is repeated until all the sub-battery packs are fully charged.

According to the invention, through carrying out the equalization management operation of the electric quantity on the battery packs in the same charging stage, the consistency of the electric quantity of each independent battery pack in the same charging stage can be realized, and the management of each independent battery pack is convenient.

In one embodiment of the invention, the charging phase comprises: a trickle charge phase, a constant current charge phase and a constant voltage charge phase.

In an embodiment of the present invention, the collecting step S20 continuously collects the voltage information, the current information, the temperature information, and the frequency information of the inverter unit of the primary side device at a specific time interval for a plurality of times; and/or the step of collecting voltage information, current information, temperature information and electric quantity information (SOC) of the secondary side device which are continuously collected for a plurality of times at intervals of specific time in the step of S20, the step of detecting the abnormity compares the voltage information, the current information and the temperature information of the circuit at the side which are collected for each time in the step of S30 with respective specified corresponding threshold values, and when any one piece of information which is collected for one time exceeds the specified corresponding threshold value, the fault information is sent and the charging is ended; and when all the acquired information does not exceed the specified corresponding threshold value, judging whether the communication module of the circuit at the side receives the abnormal condition information sent by the communication module of the circuit at the opposite side, and performing corresponding charging control according to whether the abnormal condition information exists.

Specifically, the flow of detecting and processing the abnormal condition of the primary side (or secondary side) based on the distributed wireless charging system is described as shown in fig. 3 (the fig. 3 can be understood as a preferred control flow chart of detecting and processing the abnormal condition of the primary side (or secondary side) based on the distributed wireless charging system according to the present invention). The specific process is executed as follows:

step 1: starting; then executing the step 2;

step 2: a signal acquisition step, wherein voltages V1, V2, … and VN, currents I1, I2, … and IN, temperatures T1, T2, … and T3 of the N primary distributed energy emission mechanisms (or sub-battery packs) are acquired and returned to a primary side control unit (or a secondary side control unit); then executing the step 3;

the 3 rd to 10 th and 13 th steps are abnormality detection steps;

and 3, step 3: judging that V1> V01or V2> V02or … or VN > V0N, wherein V01, V02, … and V0N are voltage thresholds of the 1 st to Nth distributed energy emission mechanisms (or sub-battery packs), if so, executing the 4 th step; if not, executing the step 5;

and 4, step 4: displaying: circuit failure, excessive voltage; then executing the step 13;

and 5, step 5: judging that I1> I01or I2> I02or … or IN > I0N, wherein I01, I02, … and I0N are current thresholds of the 1 st to Nth distributed energy emission mechanisms (or sub-battery packs), and if so, executing the 6 th step; if not, executing step 7;

and 6, step 6: displaying: circuit failure, excessive current; then executing the step 13;

and 7, step 7: judging that T1> T01or T2> T02or … or TN > T0N, wherein T01, T02, … and T0N are temperature thresholds of the 1 st to Nth distributed energy emission mechanisms (or sub-battery packs), and if yes, executing the 8 th step; if not, executing step 9;

and 8, step 8: displaying: circuit failure, excessive temperature; then executing the step 13;

step 9: judging whether the primary side communication module (or the secondary side communication module) receives an abnormal condition; if yes, executing step 10; if not, executing step 11;

step 10: receiving and displaying abnormal conditions; then executing step 14;

the 11 th step to the 12 th step are charging control steps;

and 11, step 11: charging is carried out for one period T; then executing the step 12;

step 12: judging whether the battery is fully charged, if so, executing the step 14; if not, returning to execute the step 2;

step 13: sending fault information through a primary side communication module (or a secondary side communication module); then executing step 14;

step 14: and (6) ending.

Specifically, a charging control flow based on the secondary side N distributed sub-battery packs of the distributed wireless charging system is described as shown in fig. 4, (the fig. 4 can be understood as a preferred control flow based on the charging of the secondary side N distributed sub-battery packs of the distributed wireless charging system of the present invention). The specific process is executed as follows:

step 1: starting; then executing the step 2;

step 2: a signal acquisition step, wherein the SOC values SOC1, SOC2, SOC … and SOCN of the sub-battery packs are acquired; then executing the step 3;

step 3-step 5 are electric quantity equalization management steps;

and 3, step 3: determining the upper and lower limits of the electric quantity SOCM (0< M < N) of all the sub-battery packs: sk-1< SOCM ≦ sk (1< k < n) (sk is a node value of SOC in a segmented charging process, the charging process is divided into n stages in total, and 0 ═ s0 ≦ sk-1< sk ≦ sn ═ 1); then executing the 4 th step;

and 4, step 4: the sub battery pack with the electric quantity SOC (state of charge) sk is disconnected for charging; then executing the step 5;

and 5, step 5: judging the electric quantity of all the sub-battery packs to be sk, if so, executing the step 6; if not, returning to execute the step 2;

the 6 th step to the 7 th step are charging control steps;

and 6, step 6: judging sk to be 1, if yes, executing the step 8; if not, executing step 7;

and 7, step 7: all the sub-battery packs are connected for charging; then returning to execute the step 2;

and 8, step 8: and finishing charging.

Note that sk 1 indicates a full battery state, and sk 0 indicates that charging has not been performed.

According to the embodiment, the primary side is composed of N working independent transmitting coils, each transmitting coil is connected with an independent inversion unit, all the inversion units are powered by one power supply, low-voltage direct current output by the power supply is inverted into high-frequency alternating current, and then energy is transmitted through the transmitting coils. The primary side communication module and all the inversion units are connected with the primary side control unit, the primary side control unit mainly monitors the voltage and the current of the primary side and the temperature of the components easy to heat, when one of the voltage, the current and the temperature exceeds a preset threshold value, the primary side control unit judges that abnormal charging conditions occur and controls the power supply to be disconnected to stop charging, meanwhile, the abnormal conditions are sent to the secondary side communication module through the primary side communication module, and meanwhile, the primary side control unit realizes optimization of each wireless energy transmission module through frequency adjustment of the inversion units.

The vehicle-mounted battery pack is composed of N distributed independent sub-battery packs, each sub-battery pack is installed at different positions on the vehicle and connected with independent secondary receiving coils, and the N secondary receiving coils are installed at different positions on the vehicle so as to be convenient for matching with the energy transmitting coil to achieve wireless transmission of electric energy. The high-frequency alternating current received by the receiving coil is rectified into a low-voltage direct current power supply through a rectifying module and then is charged into the independent sub-battery pack through monitoring and adjustment of a Battery Management System (BMS). And the N Battery Management Systems (BMS) and the secondary communication module which are connected with the N distributed independent sub-battery packs are connected with the secondary control unit so as to receive the data of the temperature, the electric quantity (SOC), the charging voltage and the current of each independent sub-battery pack. The secondary side control unit judges whether the abnormal charging condition occurs or not by judging whether the temperature, the charging voltage and the current of the battery exceed preset thresholds or not, and when the abnormal charging condition occurs, the secondary side control unit cuts off a circuit to stop charging and sends the abnormal condition to the primary side communication module through the secondary side communication module. The electric quantity balance management of the vehicle-mounted distributed independent sub-battery packs is realized through sectional charging, namely, a stage SOC value can be set by setting sectional charging electric quantity in advance, and 0< S1< S2< S3<. > < Sn <1 >. If the SOC value of each current battery pack is between sk-1(0< k < n) and sk, stopping charging the battery pack when the charging of a certain independent sub-battery pack reaches sk, and restarting charging all independent sub-battery packs when the electric quantity of all independent sub-battery packs reaches sk; when the electric quantity of the independent sub-battery packs reaches sk +1, the battery packs stop charging until the electric quantities of all the battery packs reach sk +1, and then the battery packs restart charging; this is repeated until all the battery packs are fully charged.

Based on the embodiment of the invention, the independent battery packs are arranged at different positions of the target equipment to be charged, so that the high-power quick charging of the whole target equipment to be charged can be realized by quickly charging each independent sub-battery pack, and meanwhile, because the charging working rate of each independent sub-battery pack is smaller than the charging power required by the whole large battery pack, the electromagnetic radiation intensity in the charging process is effectively reduced, the influence on the safety of people around and other organisms is avoided, and the charging safety is improved; according to the invention, through carrying out the equalization management operation of the electric quantity on the battery packs in the same charging stage, the consistency of the electric quantity of each independent battery pack in the same charging stage can be realized, and the management of each independent battery pack is convenient.

It should be noted that the above-mentioned embodiments enable a person skilled in the art to more fully understand the invention, without restricting it in any way. Therefore, although the present invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention.

Claims

1. A wireless charging system based on a distributed mode comprises a primary side device and a secondary side device, wherein the primary side device comprises an inversion unit, a primary side transmitting coil, a primary side circuit data acquisition module, a primary side communication module and a primary side control unit, and the secondary side device comprises a secondary side communication module and a secondary side control unit;

2. The wireless charging system of claim 1, wherein the step charging value set by the secondary control unit for charging each sub-battery pack in stages is specifically:

3. The wireless charging system of claim 2, wherein the charging phase comprises: a trickle charge phase, a constant current charge phase and a constant voltage charge phase.

4. The wireless charging system of claim 2, wherein the current stage charge cap has a value between 0 and 1.

5. The wireless charging system of claim 1, wherein the different locations of the electric vehicle where the sub-battery packs are installed separately in a distributed manner include a chassis, a rear seat, and a roof of the electric vehicle.

6. The wireless charging system according to claim 1or 2, wherein the primary circuit data acquisition module continuously acquires voltage information, current information, temperature information, and frequency information of the inverter unit of the primary device at a specific time interval for a plurality of times; and/or the battery management system continuously acquires the voltage information, the current information, the temperature information and the electric quantity information (SOC) of the secondary side device for multiple times at specific time intervals, the primary side control unit and/or the secondary side control unit respectively compare the acquired voltage information, current information and temperature information of the circuit at the local side with respective specified corresponding threshold values, and when any one acquired information exceeds the specified corresponding threshold value, the primary side control unit and/or the secondary side control unit sends fault information and finishes charging; and when all the acquired information does not exceed the specified corresponding threshold value, judging whether the communication module of the circuit at the side receives the abnormal condition information sent by the communication module of the circuit at the opposite side.

7. A wireless charging method based on distribution is used for electromagnetic induction type wireless charging of an electric automobile, and is characterized by comprising the following steps:

8. The wireless charging method according to claim 7, wherein in the charging control step, the step of charging the sub-battery packs in stages by setting the step capacity value by the secondary control unit specifically includes:

9. The wireless charging method of claim 8, wherein the charging phase comprises: a trickle charge phase, a constant current charge phase and a constant voltage charge phase.

10. The wireless charging method according to claim 7 or 8, wherein the collecting step continuously collects voltage information, current information, temperature information, and frequency information of the inverter unit of the primary side device at a specific time interval for a plurality of times at the same time; and/or the acquisition step continuously acquires the voltage information, the current information, the temperature information and the electric quantity information (SOC) of the secondary side device for multiple times at specific time intervals, the abnormality detection step compares the acquired voltage information, current information and temperature information of the circuit at the current side with respective specified corresponding threshold values, and when any one acquired information exceeds the specified corresponding threshold value, the abnormality detection step sends fault information and ends charging; and when all the acquired information does not exceed the specified corresponding threshold value, judging whether the communication module of the circuit at the side receives the abnormal condition information sent by the communication module of the circuit at the opposite side.