CN116198349A

CN116198349A - Charging method of lithium battery system

Info

Publication number: CN116198349A
Application number: CN202310065532.2A
Authority: CN
Inventors: 邹刚强; 罗秀清
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-01-13
Filing date: 2023-01-13
Publication date: 2023-06-02

Abstract

The invention belongs to the technical field of lithium batteries, and particularly provides a charging method of a lithium battery system. The method comprises the following steps: acquiring battery charging abnormal state information data and performing preliminary analysis to obtain corresponding battery abnormal state analysis, wherein the battery abnormal state is divided into a battery overall abnormal state and a battery internal monomer abnormal state; analyzing the whole abnormal state of the battery according to the analysis of the whole abnormal state of the battery in the abnormal state of the battery, and analyzing to obtain the whole abnormal state information of the battery, so that the battery enters a battery maintenance state and the corresponding charging power is changed properly; the invention can solve the problem that accidents happen due to the fact that the abnormality exists when the vehicle is charged in the present period, and brings a safer charging mode.

Description

Charging method of lithium battery system

Technical Field

The invention belongs to the technical field of lithium batteries, and relates to a charging method of a lithium battery system.

Background

The performance of the power battery has direct influence on the cruising ability and the cost of the electric automobile. Among the many alternative battery types, lithium ion batteries have become the primary choice for electric vehicles because of their high specific energy, long life, wide operating temperature range, and the like. At the same time, however, the characteristic of long charging time of lithium ion batteries becomes one of the main limiting conditions for the application of the lithium ion batteries. However, if rapid charging is adopted, a large amount of energy loss is generated in the charging process. Particularly, under the condition of high temperature or low temperature, the quick charging has great potential safety hazard in the charging process, so that in order to avoid accidents, the charging process needs to be monitored in real time and corresponding action adjustment is needed.

Disclosure of Invention

The invention provides a charging method of a lithium battery system, which aims to solve at least one technical problem.

The invention provides a charging method of a lithium battery system, referring to fig. 1, comprising the following steps:

step S1: the charging pile obtains a battery identity recognition signal, real-time temperature information of a current vehicle battery and current environment temperature information through a communication line or a power line in a charging socket of a vehicle body, wherein the battery identity recognition signal comprises battery internal resistance data;

step S2: threshold judgment is carried out according to the real-time temperature information and the current environment temperature information of the current vehicle battery, and initialization safety charging data are generated by combining the internal resistance data of the battery in the battery identification signal so as to execute dynamic variable-current constant-voltage constant-temperature charging operation;

step S3: the battery safety real-time system monitors the state of the primary dynamic variable-current constant-voltage constant-temperature charged battery in real time according to a communication line or a power line in a charging socket of the vehicle body so as to obtain battery charging real-time change data;

step S4: analyzing the real-time change data of battery charging through a charging safety guarantee model to generate abnormal state information data of battery charging;

Step S5: performing battery charging safety feature analysis on the vehicle battery in a charging state through the battery charging abnormal state information data to obtain a battery charging safety feature abnormal result;

step S6: repairing abnormal battery charging of a vehicle battery according to the abnormal result of the battery charging safety feature, and collecting emergency abnormal power-off processing data;

step S7: the emergency abnormal power-off processing data is utilized to carry out threshold analysis, so that the power-off processing is carried out on the vehicle battery exceeding the emergency abnormal power-off processing data threshold value through the circuit control device;

step S8: the charging pile obtains abnormal charging battery data of the vehicle battery subjected to power failure treatment through a communication line or a power line in a charging socket of the vehicle body, updates a battery identification signal according to the data, and marks the abnormal charging battery identification signal and the abnormal charging battery;

step S9: and sharing the identity recognition signal of the abnormal rechargeable battery to a cloud server through a local server to establish long-term early warning information, and simultaneously pushing the long-term early warning information to a vehicle user corresponding to the vehicle battery to perform safety early warning.

Referring to fig. 2, the method for obtaining real-time temperature information of a current vehicle battery and current environmental temperature information in an embodiment of the present invention includes the following steps:

In detail, in the embodiment of the invention, the charging pile obtains a battery identification signal, real-time temperature information of a current vehicle battery and current environment temperature information through a communication line or a power line inside a charging socket of a vehicle body, wherein the battery identification signal comprises battery internal resistance data:

step S11: the charging pile detects and acquires the state of a battery identification code corresponding to the current vehicle battery through a communication line or a power line in a charging socket of the vehicle body, so as to judge the state of the battery identification code of the current vehicle battery;

step S12: detecting and obtaining an abnormal charging battery identification signal and a historical use record of a vehicle battery corresponding to the battery identification code, and rejecting a charging request when the current vehicle battery is still in an abnormal charging state by analysis;

in detail, the analysis of the identification signal and the history of the battery in the abnormal charging state means that in the past charging process, the battery has the history of power failure and has not reached the abnormal state prediction release time set by the system and the situation that the battery system frequently uses the charging pile in a short time, for example, when the battery is in the previous charging, the battery is in the power failure processing due to the abnormal temperature of the battery and exceeds the safe charging temperature, and the system sets the corresponding abnormal state prediction release time according to the current environmental temperature, so as to ensure the battery to be charged in the safe charging state;

In the embodiment of the invention, the battery in an abnormal charging state is obtained through analyzing the identity identification signal and the history use record of the abnormal charging battery, and the charging request of the current battery is refused, so that unexpected occurrence caused by charging the battery of the vehicle by a user changing the charging pile when the battery is abnormal can be effectively prevented, meanwhile, the loss of the battery can be reduced, the service life of the battery can be prolonged, the capacity of the battery can be ensured to be not damaged as much as possible, thereby ensuring that the battery can bring better cruising effect and driving experience for the user, reducing the economic cost brought by changing the battery, simultaneously also ensuring the safety of the battery in the driving process for the user, preventing the occurrence of safety accidents caused by the battery in the driving process and ensuring the safety of passengers in the vehicle; the influence on the service life and capacity of the battery caused by frequent charging is refused, the situation that the service life and capacity of the battery are influenced when the battery is damaged is prevented, the user still carries out the parallel and inverse charging action, the user experiences when driving by using the battery, and the battery capacity of the battery system of the vehicle is inaccurately identified in the using process due to the battery caused by the damaged battery capacity, so that the situation that the user suddenly cuts off power in the daily use is caused, the occurrence of traffic accidents caused by the situation can be effectively prevented, the service life of the electric automobile can be prolonged, and the purchase wish of the user is improved;

Step S13: the method comprises the steps of distributing a unique battery identification code to a vehicle battery which does not acquire the battery identification code, and uploading the battery identification code to a cloud server for storage;

in detail, the battery identification code is one or more groups of unique battery identification codes generated according to the charging core of the current battery, basic information inside the battery and user information, and the unique battery identification codes are not changed along with the loss of the battery, and can also prevent other people from masquerading as a main charging behavior; it should be understood that, in order to ensure that the identification code is not easily cracked, the vehicle does not store the corresponding identification code, but generates and stores encryption by the charging pile when the identification code is connected with the charging pile for the first time, so that when the vehicle is used again, the vehicle can quickly identify and perform the next operation, wherein the encryption and decryption stages are performed by a server of the cloud;

in the embodiment of the invention, the battery identification code with uniqueness is identified and generated, and the corresponding battery charging file can be established based on the identification code to store historic records and timely distinguish the historic records, so that the battery in an abnormal charging state can be quickly identified, accidents caused by charging the battery in the abnormal charging state of the charging pile are prevented, the possibility of damage to the vehicle and the user is reduced, and the safety of the vehicle and the personal safety of the user are ensured; the identification can also prevent other vehicles from counterfeiting the vehicle to charge, so that a user can ensure that funds prestored in an account are safer and the loss of merchants during charging and recharging is reduced, the user can also perform charging operation under the condition that no mobile phone or mobile phone network is affected, so that the electricity consumption requirement of the current user under the emergency condition is met, when the user has a historical charging record exceeding a menu escaping operation threshold, corresponding record is also performed, and power-off processing is performed in time, so that the loss of a charging pile merchant is reduced, and the possibility of menu escaping of the user is reduced; the encryption storage is carried out through the cloud instead of the encryption storage in the charging pile in the connection stage, so that the stealing of identification codes in the process can be effectively prevented, when the battery identification codes which are encrypted are stolen and the equipment is attempted to be modified by the identification so as to charge other vehicles, the charging pile can reject corresponding requests and push the illegal charging requests to corresponding user terminals for reminding, thereby ensuring the fund safety pre-stored in a user account and preventing the situation that users cannot charge under emergency caused by illegal operations of others, and reducing unnecessary disputes caused by the operations to charging merchants and users; it is to be understood that after the battery identification code is carried out by the charging pile, the battery identification code is uploaded to the cloud, the cloud converts the battery identification code into an identification code with a specific length in a specific encryption and complementation mode, when someone obtains the identification code and uses the code to carry out connection charging, secondary encryption processing is carried out, and at the moment, the battery identification code in the cloud is compared to generate corresponding change;

Step S14: for the vehicle battery with the obtained or detected battery identification code, acquiring the current residual electric quantity of the vehicle battery, the internal resistances and the initial SOC of different monomers in the vehicle battery through a communication line or a power line in the charging socket, and generating a battery identification signal;

in the embodiment of the invention, the residual electric quantity of the current vehicle is obtained so as to better carry out the planning action of charging the battery in the follow-up process, and the situation of overcharging the battery is prevented, so that the battery can be better protected, the time required by charging can be better calculated, the corresponding capacity can be calculated through the residual electric quantity and the internal resistance, the safety of the battery in the charging process can be better ensured in the follow-up process, the charging time required by the current battery capacity can be calculated, and the situation that the user cannot reach the corresponding longest endurance in the use process due to the insufficient charging of the battery can be prevented, so that the user experience is poor;

step S15: the method comprises the steps of collecting the battery temperature and the environment temperature in real time through a temperature sensing system, and collecting the real-time temperature data and the environment temperature data of a vehicle battery through a temperature collector to obtain the real-time temperature information and the current environment temperature information of the current battery;

In the embodiment of the invention, the temperature of the vehicle battery and the ambient temperature are acquired in real time through the temperature sensing system, and the real-time temperature data and the ambient temperature data of the vehicle battery are collected by the temperature acquisition device so as to obtain the real-time temperature information and the current ambient temperature information of the current vehicle battery;

referring to fig. 3, in the embodiment of the present invention, step S2 is specifically the steps of;

step S21: judging an environmental threshold value of the current environmental temperature information to obtain the environmental temperature threshold value;

in detail, aiming at the current environmental temperature information, according to the current charging position and the current season, the system adjusts an environmental threshold value, so that the situation that the charging cannot be performed for a long time due to incapability of adjusting the environmental temperature threshold value at any time is prevented, normal use of a user is affected, the situation that the use experience of the user is reduced is prevented, and meanwhile, the problem that the environmental temperature threshold value is fixed and the regional or time is caused is prevented;

step S22: analyzing according to the environmental temperature threshold value to obtain the internal resistance change value of the environmental temperature of the battery which is currently subjected to the environmental temperature change;

it should be understood that when the external environment change is the internal resistance of the battery, the charging efficiency will also change correspondingly, so that a certain error may exist in the directly obtained internal resistance of the battery, thereby further increasing the battery temperature in the charging process, causing unexpected occurrence and continuous increase of the battery temperature in the recharging process, causing low charging efficiency and energy loss in the recharging process, and further causing economic increase of the charging cost of the user;

Step S23: judging a battery temperature threshold value according to the real-time temperature information of the current battery to obtain the battery temperature threshold value;

step S24: obtaining a battery temperature internal resistance change value of the battery internal resistance along with the change of the battery according to the battery temperature threshold value analysis;

step S25: according to the battery environment temperature internal resistance change value and the battery temperature internal resistance change value, combining the battery internal resistance data in the battery identification signal, calculating to obtain the battery internal resistance value and the battery capacity value of the current vehicle battery so as to update the battery identification signal and obtain initialized safe charging data;

the capacity is calculated according to the residual electric quantity, and specifically comprises the following steps:

transmitting a constant voltage electric signal which is stable for a short time to a vehicle battery, and generating a single voltage curve for a single body in a vehicle battery system;

analyzing the single voltage curve to obtain an optimal single voltage curve which reaches the charging rate at first, and changing and updating the rest single voltage curves by taking the optimal single voltage curve as a reference, so that the charging maximum capacity corresponding to each single cell is obtained through calculation of a battery single maximum capacity formula, and the battery single maximum capacity formula is as follows:

wherein C is _S Representing the maximum charge capacity of each monomer, I is the corresponding variable current value of the current charge, U is the corresponding constant voltage value of the current charge, T ₀ To get the time of the charge rate monomer first, T _i For the time of remaining monomer i reaching the charge rate, H is the corresponding remaining electric quantity of each monomer, x is the number of charge and discharge times obtained by identification, T _k The predicted charge time corresponds to the current charge rate.

In the embodiment of the invention, the residual electric quantity C is used _S The current battery capacity can be mastered in real time to prevent accidental battery charging accidents caused by temperature rise or temperature reduction due to stable current I and voltage U, and the method can be used for monitoring the current health state in real timeTherefore, the use experience of a user is further improved, the current capacity of the battery is guaranteed, and the battery is not damaged;

step S26: the charging safety system is utilized to execute the action of initializing safety charging data, so that primary dynamic variable-current constant-voltage constant-temperature charging operation is carried out;

in detail, a charging safety system is utilized to generate a user operation acquisition control, and user operation data is acquired through the user operation acquisition control, wherein the user operation data comprises two dynamic variable-flow constant-voltage constant-temperature charging modes including a quick charging mode and a safe charging mode;

In detail, judging whether the user operation data includes a quick charge mode or a safe charge mode;

in detail, when it is determined that the user operation data includes a quick charge mode, the quick charge mode is executed;

in detail, when it is determined that the user operation data includes the safe charging mode, the safe charging mode is performed.

In the embodiment of the invention, whether the user operation data comprises a quick charging mode or a safe charging mode is judged, so that the charging mode is more intelligent and safer, and the real-time requirement of a user is met more, and it is understood that the service life of a battery is shorter than that of a corresponding slow charging battery with the same charging times to a certain extent due to the immaturity of the current quick charging technology, so that the service life of the battery can be protected by slow charging when the user does not need to use a car urgently, but if the user needs to use the car urgently, the slow charging cannot meet the use habit of the current user, and the timely charging requirement cannot be brought to the user timely;

in the embodiment of the invention, judging whether the user operation data comprises a quick charging mode or a safe charging mode to obtain the real-time change data of the battery charging comprises the following steps: the method has the advantages that the method monitors the voltage and the current in real time during charging and monitors the temperature and the capacity of the battery in real time, prevents the battery from being charged in an optimal state in the current environment due to corresponding data errors in the dynamic variable-current constant-voltage constant-temperature charging operation, thereby influencing the service life of the battery and reducing the possibility of damaging the battery, and simultaneously can reduce the possibility of accidents in the process again so as to improve the safety in the charging process;

Referring to fig. 4, in the embodiment of the present invention, according to the real-time change data of battery charging, the specific generation of the abnormal state information data of battery charging by the analysis of the charging safety guarantee model is as follows:

step S41: confirming the structural parameters required by the current charging safety guarantee model network, and inputting the initialized safety charging data into the neural network, so as to obtain a charging safety guarantee model;

step S42: updating the network weight and bias of the charging safety guarantee model by using the charged real-time detection data, thereby obtaining a training updated charging safety guarantee model;

step S43: acquiring initial battery charging real-time change data, wherein the initial battery charging real-time change data comprises real-time process data of normal charging of a vehicle battery and historical data of normal charging process of the vehicle battery;

step S44: analyzing and processing the initial battery charging real-time change data by using a multi-order Lagrangian interpolation method to obtain the integrated battery charging real-time change data;

step S45, inputting the real-time change data of the integrated battery charging into a charging safety guarantee model, calculating the residual mean value and standard deviation of the charging voltage, charging current and temperature predicted values during normal charging of the electric automobile, determining the threshold value of multi-parameter fault early warning, and obtaining the abnormal state information data of the battery charging;

In the embodiment of the invention, the residual mean value and standard deviation of the charging voltage, the charging current and the temperature predicted value are calculated when the electric automobile is normally charged, and the threshold value of the multi-parameter fault early warning is determined, so that the threshold value is continuously changed, the method can be applied to the use of different vehicle batteries or batteries with other purposes, the charging safety of other batteries with different types can be ensured, meanwhile, the threshold value of the multi-parameter fault early warning is in a certain dynamic range, the current battery health safety charging can be carried out according to the charging voltage, the charging current and the temperature predicted value when the current electric automobile is normally charged, the battery safety charging always accords with the optimal grabbing state of the current battery, the battery capacity and the battery service life are reduced as far as possible, the battery can provide better endurance for users as far as possible, and the experience of the users is improved; meanwhile, the loss caused by the overhigh temperature of the battery during charging can be reduced, so that the temperature of the battery is continuously increased, the internal resistance of the battery is continuously influenced, the charging safety and the energy loss in the charging stage are influenced, and it is understood that the change of electrolyte in the battery is influenced when the temperature of the battery is increased, so that the resistance is increased, and if the current at the moment is unchanged, the heat generated by the corresponding internal resistance of the battery is correspondingly increased, so that the resistance is also possibly increased continuously;

In the embodiment of the invention, the charging safety guarantee model is trained by a common neural network, can quickly capture data in the real-time change data of the charging of the current battery, can analyze and obtain a neural network model of abnormal data, and has the characteristics of high precision and quick response; the charging pile can also rapidly identify and obtain abnormal charging data besides the vehicle, so that the safety of the charging pile and the safety of the nearby vehicle and the charging pile for charging are guaranteed to a certain extent, the expenditure of the large-scale charging pile in the aspect of personnel investment is reduced, and the expenditure in corresponding funds is reduced;

referring to fig. 5, in an embodiment of the present invention, specific steps for obtaining an abnormal result of a battery charging safety feature are as follows:

step S51: acquiring battery charging abnormal state information data and performing preliminary analysis to obtain corresponding battery abnormal state analysis, wherein the battery abnormal state is divided into a battery overall abnormal state and a battery internal monomer abnormal state;

step S52: analyzing the whole abnormal state of the battery according to the analysis of the whole abnormal state of the battery in the abnormal state of the battery, and analyzing to obtain the whole abnormal state information of the battery, so that the battery enters a battery maintenance state and the corresponding charging power is changed properly;

In the embodiment of the invention, the battery is put into the battery maintenance state, so that the possibility of accidental risk caused by overcharge can be reduced, the safety problem caused by the rise of the battery temperature and the battery heating problem caused by the rise of the temperature can be reduced, the success rate of the subsequent repair is improved, the safety during charging is further ensured, and the user experience is improved;

step S53: carrying out battery cell state analysis on the abnormal state of the battery cell in the abnormal state of the battery, thereby acquiring abnormal battery cell information and enabling the abnormal battery cell to enter a battery maintenance state;

in the embodiment of the invention, the abnormal battery monomer information is obtained through analysis, and the abnormal battery monomer is enabled to enter a battery maintenance state, so that the battery monomer which is not in the abnormal state can be charged, the charging efficiency is ensured, meanwhile, the charging safety is ensured, when the subsequent repair fails, the battery is only powered off, the whole battery can be operated, the temporary vehicle electricity demand of a user can be met, the risk that the user cannot continue to use in the charging stage is reduced, the user has enough electric quantity to go to a corresponding maintenance station for replacement, the cost and the corresponding time of the user in the stage are reduced, the better experience is brought to the user, and meanwhile, the reliability of the abnormal result of the battery charging safety characteristic is also improved, so that the probability of the subsequent repair success is improved;

Step S54: and acquiring battery monomer information in a battery maintenance state and battery overall abnormal state information, and performing comprehensive diagnosis and analysis to obtain a battery charging safety characteristic abnormal result.

In the embodiment of the invention, the abnormal result of the battery charging safety characteristic is obtained through the analysis of the battery charging abnormal state information data so as to determine the reason for causing the abnormal data, so that corresponding repair work can be carried out later, the problem that when a fault occurs, a user cannot feed back timely to cause abnormal power failure is solved, inconvenience is caused to the occurrence of the user, and the experience of the user is reduced is solved; meanwhile, the corresponding abnormal result is obtained through analysis, so that the probability of successful repair is improved, and when the repair fails, a user can quickly process simple problems, and the maintenance cost is reduced;

in the implementation of the invention, the abnormal repair of the battery charge is carried out on the vehicle battery to collect abnormal data, and the abnormal data is marked as emergency abnormal power-off processing data, so that the subsequent power-off processing can be carried out on the battery which is still in an abnormal state and exceeds a threshold value, thereby further ensuring the safety of the charge;

In the embodiment of the present invention, the specific step of step S7 is as follows:

further, the threshold value analysis is carried out by utilizing the emergency abnormal power-off processing data, so that the vehicle battery with the emergency abnormal pre-power-off which has multiple repairs in a preset time period and still reaches the charging safety dangerous value after repair is obtained;

further, the circuit control device is utilized to charge and power off the vehicle battery which is in emergency abnormal pre-power-off, and meanwhile, the electric signal which can be used for data transmission is reserved;

in the embodiment of the invention, the emergency abnormal pre-power-off battery is charged and powered off, and meanwhile, the electric signal for data transmission is reserved so as to acquire the data of the current battery, so that when the vehicle battery is charged again, the charging request of the abnormal battery can be quickly reacted, the charging request of the abnormal battery is refused in the application stage, the possibility of accidents is reduced, the charging safety is ensured, the electric signal for data transmission can not generate further damage to the battery, a certain protection effect is realized on the battery, and the further damage to the battery caused by excessive current voltage is prevented when the data acquisition is not performed; meanwhile, the battery in an abnormal state is subjected to corresponding power-off treatment, so that the battery in the abnormal state is effectively prevented from being subjected to abnormal charge and discharge, and the charging pile is possibly influenced correspondingly, the subsequent normal work of the charging pile and the subsequent vehicle battery and vehicle charged in the charging pile can be ensured, a certain safety guarantee effect is achieved, and the damage to the user vehicle battery caused by the abnormality of the charging pile is prevented; meanwhile, the influence of accidents such as fire and the like on other surrounding vehicles caused by the fact that power-off treatment is not performed in time can be avoided, so that the charging safety of the surrounding charging vehicles and the personal safety of surrounding personnel are guaranteed;

In the embodiment of the invention, step S8 is used for acquiring the abnormal charging battery data of the battery subjected to power-off processing and updating the battery identification signal according to the data, so that when the battery is charged and connected again, the current vehicle battery can be quickly reacted, and the current vehicle battery can be conveniently matched with the charging mode and the charging parameter of the current battery, thereby reducing the probability that the user cannot continue normal use due to short-term abnormal state and system errors in long-term use of the user, improving the user experience, and simultaneously timely improving the user overhauling for the long-term user with the problem, so as to ensure the safety of the user;

referring to fig. 6, in the embodiment of the present invention, the step of sharing the abnormal rechargeable battery identification signal to the cloud server through the server to establish a long-term early warning system, and pushing the signal to the user to perform the safety early warning includes:

step S91: transmitting the obtained abnormal rechargeable battery identification signal to a database of a cloud server, and simultaneously carrying out encryption processing on data;

step S92: matching a database of the cloud server with a corresponding historical use record, and analyzing the current abnormal state to obtain the duration of abnormal state prediction, wherein the duration is marked as abnormal state prediction release time;

According to the embodiment of the invention, the duration of abnormal state prediction is obtained, so that the battery safety is protected, the reuse of a user is not influenced, the user experience is improved, and the long-term influence of short-term faults on the user is avoided;

step S93: and carrying out release time threshold analysis according to the normal state prediction release time to obtain an abnormal state battery exceeding the release time threshold, establishing long-term early warning information, and storing the long-term early warning information in a history use record.

In the embodiment of the invention, the battery with the potential safety hazard for a long time is managed by acquiring the abnormal state battery exceeding the release time threshold, establishing the long-term early warning information and storing the long-term early warning information in the history use record so as to timely remind a user correspondingly, thereby preventing accidents caused by the existence of a delight of the user, and preventing accidents caused by the improper charging of the user and unnecessary disputes caused by the unnormal charging of the user when the charging request of the vehicle battery is subsequently refused;

in the embodiment of the invention, the corresponding battery identification signal is obtained from the vehicle battery, and the battery identification signal is encrypted and stored in the cloud for matching the history record of the cloud, so that the vehicle battery with potential safety hazard in the prior art can be rapidly subjected to the charge rejection behavior treatment, the charging state of the battery is monitored in real time and the corresponding repair work is performed, the defect that the user cannot perform timely power-off treatment in the past can be overcome, meanwhile, the charging efficiency can be improved, the safety of the user during charging can be guaranteed, and the damage to the vehicle battery can be reduced.

Drawings

Fig. 1 is a flow chart illustrating a charging method of a lithium battery system according to an embodiment;

FIG. 2 is a flow chart of obtaining real-time temperature information of a current vehicle battery and current ambient temperature information according to an embodiment;

FIG. 3 is a schematic flow chart of an embodiment of performing primary dynamic variable-current constant-voltage constant-temperature charging operation;

FIG. 4 is a flowchart of obtaining battery charge anomaly status information data according to an embodiment;

FIG. 5 is a flowchart illustrating an embodiment of obtaining battery charging safety feature anomaly results;

fig. 6 is a flowchart illustrating a process of establishing long-term warning information according to an embodiment.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Referring to fig. 1, a flow chart of a charging method of a lithium battery system according to an embodiment of the invention is shown. In this embodiment, the charging method of the lithium battery system includes the steps of:

Referring to fig. 2, in the embodiment of the present invention, according to a communication line or a power line passing through the inside of a charging socket of a vehicle body, detecting, by a cloud server, a state of a current vehicle battery to establish a corresponding battery identification code includes the specific steps of:

For example, unlike the previous method of heating and recharging at low temperature, the invention utilizes the internal resistance of the battery and sets a rechargeable battery protection voltage and a single charging protection voltage in order to ensure the safety of the battery during charging, and when the voltage exceeds the rechargeable battery protection voltage or the maximum single voltage exceeds the single charging protection voltage, in order to prevent the current battery from being overcharged, a power-off measure is forced to be adopted even if the battery still does not reach the optimal charging temperature;

Step S14: the vehicle battery with the battery identification code obtained or detected obtains the current residual electric quantity of the vehicle battery, the internal resistances and the initial SOC of different monomers in the vehicle battery through a communication line or a power line in the charging socket, and generates a battery identification signal;

step S15: the over-temperature sensing system collects the temperature of the vehicle battery and the ambient temperature in real time, and the temperature collector is utilized to collect the real-time temperature data and the ambient temperature data of the vehicle battery so as to obtain the real-time temperature information and the current ambient temperature information of the current vehicle battery;

In the embodiment of the invention, the real-time temperature information and the current environment temperature information of the current battery are obtained, so that the battery charging planning is performed according to the real-time temperature information and the current environment temperature information of the current battery, the temperature of the battery is ensured to be in the optimal charging temperature for a long time, the influence of low temperature or high temperature on the health of the battery is prevented, and meanwhile, the possibility of accidental injury of a user in the process due to the fact that the charging temperature is too high is also prevented;

referring to fig. 3, in the embodiment of the present invention, the obtaining of the initialized safe charging data is specifically:

step S24: analyzing according to the battery temperature threshold value to obtain a battery temperature internal resistance change value of the internal resistance of the battery along with the change of the battery;

step S25: the battery environment temperature internal resistance change value and the battery temperature internal resistance change value are combined with the battery internal resistance data in the battery identification signal to calculate the current battery internal resistance value and the battery capacity value of the vehicle battery so as to update the battery identification signal and obtain initialized safe charging data;

In the embodiment of the invention, the residual electric quantity C is used _S The current battery capacity can be mastered in real time, so that the occurrence of battery charging accidents caused by temperature rise or temperature reduction due to the stability of the current I and the voltage U is prevented, and meanwhile, the battery charging accidents can be used for monitoring the current health state in real time, so that the use experience of a user is further improved, the current battery capacity is ensured, and the battery charging accidents are not damaged;

For example, if a user charges in the evening in long-term usage habit, and the vehicle is started in the morning the next day, and the battery can be fully charged in the safe charging mode in the period, the current system automatically selects the safe charging mode, if the user is in the charging pile of the expressway in the daytime, the system considers that the current user has urgent vehicle use, and the current user can automatically select the quick charging mode to charge, so that waiting time of the user is reduced;

For example, when the vehicle is charged rapidly in a low-temperature environment, the current charging temperature threshold value of 35 ℃ preset by the system is obtained when the vehicle is charged while being heated due to the overhigh current voltage, and it is understood that the preset safe charging temperature of the preset safe charging temperature system is a controllable variable, and then if the real-time temperature of the vehicle battery is important index data affecting the safety of the battery;

referring to fig. 4, in the embodiment of the present invention, according to the real-time change data of battery charging, the abnormal state information data of battery charging is specifically generated by analyzing the charging safety guarantee model:

step S45: the integrated battery charging real-time change data is input into a charging safety guarantee model, the residual mean and standard deviation of charging voltage, charging current and temperature predicted values during normal charging of the electric automobile are calculated, the threshold value of multi-parameter fault early warning is determined, and battery charging abnormal state information data is obtained;

in the embodiment of the invention, the residual mean value and standard deviation of the charging voltage, the charging current and the temperature predicted value are calculated when the electric automobile is normally charged, and the threshold value of the multi-parameter fault early warning is determined, so that the threshold value is continuously changed, the method can be applied to the use of different vehicle batteries or batteries with other purposes, the charging safety of other batteries with different types can be ensured, meanwhile, the threshold value of the multi-parameter fault early warning is in a certain dynamic range, the current battery can be safely charged according to the charging voltage, the charging current and the temperature predicted value when the current electric automobile is normally charged, the battery can always be in accordance with the optimal gripping state of the current battery, the battery and the service life of the battery are reduced as far as possible, the battery can provide better continuous voyage for users as far as possible, and the experience of the users is improved; meanwhile, the loss caused by the overhigh temperature of the battery during charging can be reduced, so that the temperature of the battery is continuously increased, the internal resistance of the battery is continuously influenced, the charging safety and the energy loss in the charging stage are influenced, and it is understood that the change of electrolyte in the battery is influenced when the temperature of the battery is increased, so that the resistance is increased, and if the current at the moment is unchanged, the heat generated by the corresponding internal resistance of the battery is correspondingly increased, so that the resistance is also possibly increased continuously;

for example, according to the current real-time data, the battery charging temperature rise value, the single battery pressure difference, the single battery temperature difference and the battery capacity residual rate can be extracted to prevent obvious differences of the single battery in the charging process;

step S51: carrying out preliminary analysis on the battery charging abnormal state information data to obtain corresponding battery abnormal states, wherein the battery abnormal states are divided into a battery overall abnormal state and a battery internal monomer abnormal state;

Step S52: when the whole abnormal state of the battery in the abnormal state of the battery is analyzed, obtaining the whole abnormal state information of the battery, entering a battery maintenance state through a charging safety system, and properly changing the corresponding charging power;

step S53: when the abnormal state of the battery in the abnormal state of the battery is analyzed, abnormal battery information is obtained, and the abnormal battery enters a battery maintenance state;

Step S54: and acquiring battery monomer information in a battery maintenance state or battery overall abnormal state information, and performing comprehensive diagnosis and analysis to obtain a battery charging safety characteristic abnormal result.

for example, the sudden increase in the temperature of the battery may be caused by the external environment or may be caused by the change of the resistance current, for example, the sudden occurrence of the direct sunlight in the environment, which causes the change of the ambient temperature, may cause the temperature of the whole vehicle to increase, thereby affecting the safe charging of the battery;

for example, the current battery is in an abnormal state due to the overlarge current, and at this time, the adjustment of the charging current can be tried to eliminate the abnormal situation caused by the current overcurrent, and when the current battery monomer is in a problem, the corresponding monomer is only required to be powered off, so that the whole battery is not required to be powered off;

in the embodiment of the invention, the emergency abnormal power-off processing data is utilized to carry out threshold analysis, so that the power-off processing is carried out on the battery exceeding the emergency abnormal power-off processing data threshold value through the circuit control device;

further, the threshold value analysis is carried out by utilizing the emergency abnormal power-off processing data, so that an emergency abnormal pre-power-off battery which is repaired for many times in a short time and still reaches the charging safety dangerous value after being repaired is obtained;

further, the control circuit control device performs charging and power-off treatment on the emergency abnormal pre-power-off battery, and simultaneously reserves an electric signal for data transmission;

In the embodiment of the invention, the abnormal charging battery data of the battery subjected to power-off processing is obtained, and the battery identity identification signal is updated according to the data, so that when charging connection is performed again, the current vehicle battery can be quickly reacted, and the charging mode and the charging parameters of the current battery are conveniently matched, thereby reducing the probability that the user cannot continue normal use due to short-term abnormal state and system errors in long-term use of the user, improving the user experience, and simultaneously improving the user with the problem for maintenance in time, so as to ensure the safety of the user;

referring to fig. 6, in the embodiment of the present invention, sharing an abnormal rechargeable battery identification signal to a cloud server through a server to establish a long-term early warning system, and pushing the signal to the user to perform safety early warning specifically includes the following steps:

step S91: the rechargeable battery identity identification signal is transmitted to a database of the cloud server through the local server, and encryption processing of data is carried out at the same time;

step S92: the database of the end server is matched with the corresponding historical use record, and the current abnormal state is analyzed, so that the abnormal state prediction release time is obtained;

in the example of the invention, the corresponding battery identification signal is obtained from the vehicle battery and is encrypted and stored in the cloud for matching the history record of the cloud, so that the vehicle battery with potential safety hazard in the prior art can be rapidly subjected to the charge rejection behavior treatment, and the charging state of the battery is monitored in real time and is subjected to the corresponding repair work, thereby reducing the defect that the user cannot perform timely power-off treatment in the past, improving the charging efficiency and guaranteeing the safety of the user during charging, and reducing the damage to the vehicle battery.

For example, when the long-term capacity of the battery is in a reduced state for a long time, the current battery is considered to be an abnormal battery, and the battery cannot be used for a long time even if the battery is full of the battery, so that the use experience of a user is affected;

the embodiment of the application can acquire and process the related data based on the artificial intelligence technology. Among these, artificial intelligence (Artificial Intelligence, AI) is the theory, method, technique and application system that uses a digital computer or a digital computer-controlled machine to simulate, extend and extend human intelligence, sense the environment, acquire knowledge and use knowledge to obtain optimal results.

The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of charging a lithium battery system, the method comprising the steps of:

step S2: threshold judgment is carried out according to the real-time temperature information and the current environment temperature information of the current vehicle battery, and initialization safety charging data are generated by combining the internal resistance data of the battery in the battery identification signal so as to execute primary dynamic variable-current constant-voltage constant-temperature charging operation;

step S3: the battery safety real-time system monitors the battery state in primary dynamic variable-current constant-voltage constant-temperature charging operation in real time according to a communication line or a power line inside a charging socket of the vehicle body so as to obtain battery charging real-time change data;

step S8: the charging pile acquires abnormal charging battery data of the vehicle battery subjected to power failure processing through a communication line or a power line in a charging socket of the vehicle body, updates a battery identification signal according to the abnormal charging battery data, and marks the abnormal charging battery identification signal and the abnormal charging battery;

2. The method according to claim 1, wherein step S1 is specifically:

step S15: the temperature of the vehicle battery and the ambient temperature are acquired in real time through the temperature sensing system, and the real-time temperature data and the ambient temperature data of the vehicle battery are collected by the temperature acquisition device so as to obtain the real-time temperature information and the current ambient temperature information of the current vehicle battery.

3. The method according to claim 1, wherein step S2 is specifically:

step S23: judging a battery temperature threshold value according to the real-time temperature information of the current vehicle battery to obtain the battery temperature threshold value;

step S24: analyzing according to the battery temperature threshold value to obtain a battery temperature internal resistance change value of the internal resistance of the battery along with the change of the battery of the vehicle;

step S26: and the vehicle battery is enabled to execute the action of initializing the safe charging data by utilizing the charging safety system, so that primary dynamic variable-current constant-voltage constant-temperature charging operation is carried out.

4. A method according to claim 3, wherein the battery capacity value is calculated from the remaining power, and comprising the steps of:

transmitting a constant voltage electric signal for a preset time period to a vehicle battery, and generating a single voltage curve for a single body in the vehicle battery;

The single voltage curve is analyzed to obtain an optimal single voltage curve which reaches the charging rate at first, and the rest single voltage curves in the vehicle battery are changed and updated by taking the optimal single voltage curve as a reference, so that the charging maximum capacity corresponding to each single is obtained through the calculation of a single battery maximum capacity formula, and the single battery maximum capacity formula is as follows:

wherein C is _S Representing the maximum charge capacity of each monomer, I is the corresponding variable current value of the current charge, U is the corresponding constant current of the current chargePressure value, T ₀ To get the time of the charge rate monomer first, T _i For the time of remaining monomer i reaching the charge rate, H is the corresponding remaining electric quantity of each monomer, x is the number of charge and discharge times obtained by identification, T _k The predicted charge time corresponds to the current charge rate.

5. The method according to claim 1, wherein step S4 is specifically:

step S44: analyzing and processing the initial battery charging real-time change data by using a multi-order Lagrange interpolation method to obtain the integrated battery charging real-time change data;

step S45: and inputting the real-time change data of the integrated battery charging into a charging safety guarantee model, calculating the residual mean value and standard deviation of the charging voltage, charging current and temperature predicted values during normal charging of the electric automobile, determining the threshold value of multi-parameter fault early warning, and obtaining the abnormal state information data of the battery charging.

6. The method of claim 5, wherein the step of inputting the real-time change data of the integrated battery charge into the charge safety guarantee model to obtain the battery charge abnormal state information data comprises the steps of:

inputting the real-time change data of the charging of the integrated battery into a charging safety guarantee model, and predicting the charging voltage, the charging current and the temperature of the vehicle battery to obtain charging prediction data, wherein the charging prediction data comprises a pre-charging voltage, a pre-charging current and a pre-charging temperature value;

And calculating by adopting a sliding window to obtain a residual error mean value and a standard deviation of the charging prediction data, and comparing the residual error mean value and the standard deviation with a threshold value of multi-parameter fault early warning so as to obtain battery charging abnormal state information data.

7. The method according to claim 1, wherein the specific step of step S5 is:

step S52: when the whole abnormal state of the battery in the abnormal state of the battery is analyzed, obtaining the whole abnormal state information of the battery, enabling the vehicle battery to enter a battery maintenance state through a charging safety system, and correspondingly changing the corresponding charging power;

step S53: when the abnormal state of the battery in the vehicle battery in the abnormal state of the battery is analyzed, abnormal battery information is obtained, and the abnormal battery enters a battery maintenance state;

8. A method according to claim 3, wherein step S26 is specifically:

generating a user operation acquisition control by using a charging safety system, and acquiring user operation data by the user operation acquisition control, wherein the user operation data comprises selection data of two dynamic variable-current constant-voltage constant-temperature charging operations including a quick charging mode and a safe charging mode;

judging whether the user operation data comprises a quick charging mode or a safe charging mode;

executing the fast charging mode when the user operation data is determined to contain the fast charging mode;

and executing the safe charging mode when the user operation data is determined to contain the safe charging mode.

9. The method according to claim 1, wherein step S7 is specifically:

performing threshold analysis by using the emergency abnormal power-off processing data, so as to obtain a vehicle battery with multiple repairs in a preset time period and the emergency abnormal pre-power-off which still reaches the charging safety dangerous value after repair;

the circuit control device is utilized to charge and power off the vehicle battery which is in emergency abnormal pre-power off, and meanwhile, the electric signal which can be used for data transmission is reserved.

10. The method of claim 1, wherein the step of sharing the abnormal rechargeable battery identification signal to the cloud server through the server in the step S9 to establish the long-term early warning information specifically comprises:

step S92: matching the database of the cloud server with the corresponding historical use record, and analyzing the current abnormal state to obtain abnormal state prediction release time;

step S93: and carrying out release time threshold analysis according to the release time of the abnormal state prediction to obtain an abnormal state battery exceeding the release time threshold, thereby establishing long-term early warning information and storing the long-term early warning information in a history use record.