CN107546809B - Intelligent charging system and method based on strain, temperature and voltage regulation - Google Patents
Intelligent charging system and method based on strain, temperature and voltage regulation Download PDFInfo
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Abstract
The invention relates to an intelligent charging system and method based on strain, temperature and voltage regulation, which is different from the traditional intelligent charging system only using temperature or voltage and is an intelligent charging system based on strain, temperature and voltage. The charging system comprises a strain sensor, a temperature sensor, a voltage sensor, a data acquisition device, an intelligent controller and a charger. The temperature of the lithium battery, the strain of the battery and the open-circuit voltage of the battery are measured in real time in the charging process, and the intelligent controller regulates and controls the charging voltage or the charging current in real time according to the voltage, the strain and the temperature data to complete the charging process. The system is helpful for increasing the charging speed and the cycle life of a novel lithium battery or a lithium battery with larger deformation.
Description
Technical Field
The invention relates to the field of lithium batteries and lithium battery charging and discharging, in particular to an intelligent charging system and method based on strain, temperature and voltage regulation.
Background
Lithium batteries are increasingly widely used in the fields of aerospace, automobiles, mobile phones and the like. New anode materials including materials such as silicon, which may be greatly deformed, are beginning to be used in lithium batteries.
The reasonable charging means can accelerate the charging of the lithium battery and prolong the service life of the lithium battery. The conventional lithium battery charging equipment generally charges the lithium battery through current control or voltage control, and the simplest mode is constant current charging, constant voltage charging and a constant current and constant voltage mixed mode.
According to the characteristics of the lithium battery during charging and discharging, the existing intelligent charging system can estimate the state of charge of the lithium battery by measuring the real-time voltage of the lithium battery, and different charging voltages or charging currents are adopted in different states of charge. Meanwhile, an intelligent charging system measures the temperature at the same time, and different charging voltages or charging currents are adopted by utilizing the temperature and the voltage (charge state).
With the replacement of electrode materials, new electrode materials (including silicon, carbon silicon compounds, etc.) are beginning to be used in lithium batteries, and these materials generate large deformation and internal induced stress during charging, which presents new challenges for reasonable charging modes. At present, the mode of controlling the charging current or voltage only by considering the real-time values of the temperature and the voltage still does not meet the requirement of optimizing the mode.
Disclosure of Invention
The invention solves the problems: the defects of the prior art are overcome, the intelligent charging system and the method based on strain, temperature and voltage regulation are provided, the consideration factors of the intelligent charging system of the lithium battery are expanded, and the temperature, the voltage and the strain of the lithium battery are considered, so that the charging speed and the cycle life of the novel lithium battery are improved.
The invention adopts one of the technical schemes: a strain-based smart charging system comprising: the system comprises a strain sensor, an intelligent controller and a charger; the lithium battery is charged by the charger through a method for controlling current or voltage, in the charging process, the data acquisition device acquires strain data obtained by measuring the lithium battery or the battery pack through the strain sensor, the intelligent controller processes signals for controlling the charger to output charging voltage or charging current corresponding to the variable data, so that the lithium battery has longer service life under the same charging rate or has larger charging rate under the same service life, and finally the charger completes the charging process for the battery or the battery pack.
The second technical scheme adopted by the invention is as follows: an intelligent charging system based on strain and temperature regulation comprises: the intelligent monitoring system comprises a strain sensor, a temperature sensor, a data acquisition device, an intelligent controller and a charger; the battery is charged by a charger through a current/voltage control method for the lithium battery, in the charging process, strain of the lithium battery is measured by using a strain sensor, the temperature of the lithium battery is measured by using a temperature sensor, the strain and the temperature are collected by a data acquisition device, and an intelligent controller completes data processing through the obtained strain and temperature and controls the charging current/charging voltage of the charger in real time.
The third technical scheme adopted by the invention is as follows: an intelligent charging system based on strain and voltage regulation comprises: the system comprises a strain sensor, a voltage sensor, a data acquisition device, an intelligent controller and a charger; the intelligent controller completes data processing through the acquired strain and voltage and controls the charging current or charging voltage of the charger in real time.
The invention adopts the fourth technical scheme that: an intelligent charging system based on strain and temperature and voltage regulation, comprising: the intelligent monitoring system comprises a strain sensor, a temperature sensor, a voltage sensor, a data acquisition device, an intelligent controller and a charger; in the charging process, the strain sensor is used for measuring the strain of the lithium battery, the voltage sensor is used for measuring the voltage of the lithium battery, the temperature sensor is used for measuring the temperature of the lithium battery, the data acquisition device is used for collecting the strain, the voltage and the temperature, and the intelligent controller completes data processing through the obtained strain, the obtained voltage and the obtained temperature and controls the charging current or the charging voltage of the charger in real time.
The intelligent charging system has the application range of lithium batteries with large deformation in the charging and discharging process, wherein the lithium batteries with large deformation refer to the lithium batteries of which the volume expansion rate of a positive electrode material or a negative electrode material from a lithium-poor state to a lithium-rich state is more than 10%.
The strain sensor is a non-contact sensor or a contact sensor; the measuring position of the strain sensor is the surface of the lithium battery.
The temperature sensor is a non-contact sensor or a contact sensor; the measuring position of the temperature sensor is the surface of the lithium battery.
The voltage sensor is a contact sensor.
The intelligent controller obtains an optimal functional relation I through experimentsCharging of electricityF (U, epsilon, T) or UCharging of electricityF (U, epsilon, T) controlling the magnitude of the charging current or charging voltage to charge, wherein ICharging of electricityFor magnitude of charging current, UCharging of electricityThe charging voltage is U, the battery voltage is epsilon, the battery strain is epsilon, and the battery temperature is T; the function relation adopted by the intelligent charging system based on the strain is ICharging of electricityF (epsilon) or UCharging of electricityF (epsilon); the function relation adopted by the intelligent charging system based on strain and temperature regulation is ICharging of electricityF (epsilon, T) or UCharging of electricityF (epsilon, T); the function relation adopted by the intelligent charging system based on strain and voltage regulation is ICharging of electricityF (U, epsilon) or UCharging of electricity＝f(U,ε)；The function relation adopted by the intelligent charging system based on strain, temperature and voltage regulation is ICharging of electricityF (U, epsilon, T) or UCharging of electricity＝f(U,ε,T)。
The invention adopts the fifth technical scheme that: an intelligent charging method based on strain, temperature and voltage regulation comprises the following steps: in the charging process, the temperature of the lithium battery, the strain of the lithium battery and the open-circuit voltage of the lithium battery are measured in real time, and the intelligent controller regulates and controls the charging voltage or the charging current in real time according to the voltage, the strain and the temperature data to complete the charging process.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention can simultaneously observe the temperature, voltage and strain of the lithium battery, namely the signal of volume expansion in real time, more deeply monitor the state of the lithium battery and more accurately estimate the charge state and the health state of the lithium battery.
(2) For the silicon-containing lithium battery, the volume expansion is severe, and the charging speed and the cycle life of the lithium battery can be further improved by considering the charging strategy of the volume change of the lithium battery. The volume expansion of the lithium battery is obtained from the measured strain.
(3) The charging device is more suitable for a silicon-containing lithium battery or a lithium battery with obvious volume expansion.
(4) The method has the greatest technical characteristics that the instant size of the charging current or the charging voltage is controlled by the voltage, the temperature and the strain instant signals together, and the control parameters of the charging current/voltage are widened.
(5) The invention can provide higher charging speed and prolong the service life of the lithium battery.
Drawings
FIG. 1 is a schematic block diagram of an intelligent charging system based on strain and temperature and voltage regulation according to the present invention;
fig. 2 is a schematic diagram of the composition of the intelligent charging system based on strain, temperature and voltage regulation according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
The invention adopts mature parts for assembly, and the adopted data acquisition device can simultaneously acquire temperature, voltage and strain signals. The temperature sensor can be a contact sensor (such as a thermal couple) or a non-contact sensor (such as an infrared temperature measuring instrument); the strain sensor can be a contact sensor (such as a strain sensor) or a non-contact sensor (such as an optical strain gauge); the voltage can be directly measured by contact. The intelligent controller can control the current or voltage of the charger in real time through temperature, voltage and strain by programming through signals transmitted by the data acquisition device. The adopted charger can receive the control of the intelligent controller, and can charge single lithium batteries and also can charge groups of lithium batteries.
The specific embodiment of the invention is as follows:
according to the characteristic that a new generation of lithium battery is easy to expand, the invention considers that the voltage, the temperature and the deformation are fully considered for controlling the charging current and the voltage. The intelligent charging system has the application range of lithium batteries with larger deformation in the charging and discharging process, wherein the lithium batteries with larger deformation refer to the lithium batteries of which the volume expansion rate of the anode or cathode materials from a lithium-poor state to a lithium-rich state is more than 10%.
As shown in FIG. 1, the system of the invention is composed of a strain sensor, a temperature sensor, a voltage sensor, a data acquisition device, an intelligent controller and a charger; in the charging process, utilize strain sensor to measure the strain of lithium cell, utilize voltage sensor to measure the voltage of lithium cell, utilize temperature sensor to measure the temperature of lithium cell, collect meeting an emergency, voltage, temperature by data acquisition device, the intelligent control ware accomplishes data processing and real-time control charger's charging current or charging voltage through meeting an emergency, voltage and the temperature that obtain, make the lithium cell longer under the same multiplying power of charging or the multiplying power of charging is bigger under the same lithium cell life-span, finally accomplish the charging process for lithium cell or lithium cell group by the charger.
As shown in fig. 2, a case 1 integrates a data acquisition device, an intelligent controller and a charger, the case 1 can be provided with a sensor interface, the sensor comprises a temperature sensor 4, a strain sensor 5 and a voltage sensor 3, the positive electrode and the negative electrode of the charger are integrated with the voltage sensor 3, and the charger is provided with a power switch 2, a power line 7 and the like. The temperature sensor 4 may be a thermocouple, the strain gauge 5 may be a strain gauge, and the voltage sensor 3 may be a copper wire. Wherein the voltage sensor 3, the temperature sensor 4 and the strain sensor 5 can be selected by using requirements. Can strain sensor 5 exclusive use, can temperature sensor 4 and strain sensor 5 collocation, can voltage sensor 3, temperature sensor 4 and strain sensor 5 collocation.
If 5 is used independently, the charger charges the lithium battery by a method for controlling current/voltage, in the charging process, the data acquisition device acquires strain data obtained by measuring the lithium battery or the lithium battery pack through the strain sensor, the intelligent controller processes the strain data to control the charger to output a signal of charging voltage or charging current, so that the lithium battery has a longer service life under the same charging rate or the charging rate is larger under the same service life of the lithium battery, and finally the charger completes the charging process for the lithium battery or the lithium battery pack.
If the temperature sensor 4 and the strain sensor 5 are matched, the lithium battery is charged by the charger through a method for controlling current/voltage, in the charging process, the strain sensor is used for measuring the strain of the lithium battery, the temperature sensor is used for measuring the temperature of the lithium battery, the strain and the temperature are collected by the data acquisition device, and the intelligent controller completes data processing through the obtained strain and temperature and controls the charging current/charging voltage of the charger in real time.
If the voltage sensor 3 and the strain sensor 5 are matched, the lithium battery is charged by the charger through a method for controlling current/voltage, in the charging process, the strain sensor is used for measuring the strain of the lithium battery, the voltage sensor is used for measuring the voltage of the lithium battery, the strain and the voltage are collected by the data acquisition device, and the intelligent controller completes data processing through the obtained strain and voltage and controls the charging current/charging voltage of the charger in real time.
If the voltage sensor 3, the temperature sensor 4 and the strain sensor 5 are matched, the lithium battery is charged by the charger through a method for controlling current/voltage, in the charging process, the strain sensor is used for measuring the strain of the lithium battery, the voltage sensor is used for measuring the voltage of the lithium battery, the strain and the voltage are collected by the data acquisition device, and the intelligent controller completes data processing through the obtained strain and voltage and controls the charging current/charging voltage of the charger in real time.
Optimal functional relation I obtained by intelligent controller through experimentsCharging of electricityF (U, epsilon, T) or UCharging of electricityF (U, epsilon, T) controlling the magnitude of the charging current or charging voltage to charge, wherein ICharging of electricityFor magnitude of charging current, UCharging of electricityThe charging voltage is U, the lithium battery voltage is epsilon, the lithium battery strain is epsilon, and the lithium battery temperature is T; the functional relationship adopted by the needle strain sensor 5 alone is ICharging of electricityF (epsilon) or UCharging of electricityF (epsilon); the function relation adopted by the temperature sensor 4 and the strain sensor 5 is ICharging of electricityF (epsilon, T) or UCharging of electricityF (epsilon, T); the function relation adopted by the voltage sensor 3 and the strain sensor 5 is ICharging of electricityF (U, epsilon) or UCharging of electricityF (U, epsilon); the needle voltage sensor 3, the temperature sensor 4 and the strain sensor 5 are matched, and the adopted function relationship is ICharging of electricityF (U, epsilon, T) or UCharging of electricity＝f(U,ε,T)。
The above examples are provided for the purpose of describing the invention only, and are not intended to limit the scope of the invention. The scope of the invention is defined by the appended claims. Various equivalent substitutions and modifications can be made without departing from the spirit and principles of the invention, and are intended to be within the scope of the invention.
Claims (8)
1. The utility model provides an intelligent charging system based on strain which characterized in that: the system comprises a strain sensor, an intelligent controller and a charger; the method comprises the steps that a charger charges a lithium battery by a method for controlling current or voltage, a data acquisition device acquires strain data obtained by measuring the lithium battery or a battery pack through a strain sensor in the charging process, an intelligent controller processes signals for controlling the charger to output charging voltage or charging current corresponding to the strain data, so that the lithium battery has longer service life under the same charging rate or has larger charging rate under the same battery service life, and finally the charger completes the charging process for the battery or the battery pack;
the intelligent controller obtains an optimal functional relation I through experimentsCharging of electricityF (epsilon) or UCharging of electricityControlling the magnitude of charging current or charging voltage to charge, wherein ICharging of electricityFor magnitude of charging current, UCharging of electricityIs the magnitude of the charging voltage, and epsilon is the strain of the battery;
the intelligent charging system has the application range of lithium batteries with larger deformation in the charging and discharging process, wherein the lithium batteries with larger deformation refer to the lithium batteries of which the volume expansion rate of the anode or cathode materials from a lithium-poor state to a lithium-rich state is more than 10%.
2. The utility model provides an intelligent charging system based on meet an emergency and temperature regulation and control which characterized in that: the intelligent monitoring system comprises a strain sensor, a temperature sensor, a data acquisition device, an intelligent controller and a charger; the battery is charged by a charger through a current/voltage control method for the lithium battery, in the charging process, strain of the lithium battery is measured by using a strain sensor, the temperature of the lithium battery is measured by using a temperature sensor, the strain and the temperature are collected by a data acquisition device, and an intelligent controller completes data processing through the obtained strain and temperature and controls the charging current/charging voltage of the charger in real time;
the intelligent controller obtains an optimal functional relation I through experimentsCharging of electricityF (epsilon, T) or UCharging of electricityF (epsilon, T) controlling the magnitude of charging current or charging voltage to charge, wherein ICharging of electricityFor magnitude of charging current, UCharging of electricityIs the magnitude of the charging voltage, epsilon is the battery strain, and T is the battery temperature;
the intelligent charging system has the application range of lithium batteries with larger deformation in the charging and discharging process, wherein the lithium batteries with larger deformation refer to the lithium batteries of which the volume expansion rate of the anode or cathode materials from a lithium-poor state to a lithium-rich state is more than 10%.
3. The utility model provides an intelligent charging system based on meet an emergency and voltage regulation and control which characterized in that: the intelligent control system comprises a strain sensor, a voltage sensor, a data acquisition device, an intelligent controller and a charger; the method comprises the following steps that a charger charges a lithium battery through a method for controlling current or voltage, in the charging process, a strain sensor is used for measuring strain of the lithium battery, a voltage sensor is used for measuring voltage of the lithium battery, a data acquisition device is used for collecting the strain and the voltage, and an intelligent controller completes data processing through the obtained strain and voltage and controls the charging current or the charging voltage of the charger in real time;
the intelligent controller obtains an optimal functional relation I through experimentsCharging of electricityF (U, epsilon) or UCharging of electricityF (U, epsilon) controlling the magnitude of the charging current or charging voltage to charge, wherein ICharging of electricityFor magnitude of charging current, UCharging of electricityThe charging voltage is U, the battery voltage is U, and the battery strain is epsilon;
the intelligent charging system has the application range of lithium batteries with larger deformation in the charging and discharging process, wherein the lithium batteries with larger deformation refer to the lithium batteries of which the volume expansion rate of the anode or cathode materials from a lithium-poor state to a lithium-rich state is more than 10%.
4. The utility model provides an intelligent charging system based on meet an emergency and temperature and voltage regulation and control which characterized in that: the intelligent control system comprises a strain sensor, a temperature sensor, a voltage sensor, a data acquisition device, an intelligent controller and a charger; in the charging process, strain of the lithium battery is measured by using a strain sensor, voltage of the lithium battery is measured by using a voltage sensor, temperature of the lithium battery is measured by using a temperature sensor, the strain, the voltage and the temperature are collected by a data acquisition device, and an intelligent controller completes data processing through the obtained strain, voltage and temperature and controls charging current or charging voltage of a charger in real time;
the intelligent controller obtains an optimal functional relation I through experimentsCharging of electricityF (U, epsilon, T) or UCharging of electricityF (U, epsilon, T) controlling the magnitude of the charging current or charging voltage to charge, wherein ICharging of electricityFor magnitude of charging current, UCharging of electricityThe charging voltage is U, the battery voltage is epsilon, the battery strain is epsilon, and the battery temperature is T;
the intelligent charging system has the application range of lithium batteries with larger deformation in the charging and discharging process, wherein the lithium batteries with larger deformation refer to the lithium batteries of which the volume expansion rate of the anode or cathode materials from a lithium-poor state to a lithium-rich state is more than 10%.
5. The intelligent charging system according to any one of claims 1 to 4, wherein: the strain sensor is a non-contact sensor or a contact sensor; the measuring position of the strain sensor is the surface of the lithium battery.
6. The intelligent charging system according to claim 2 or 4, wherein: the temperature sensor is a non-contact sensor or a contact sensor; the measuring position of the temperature sensor is the surface of the lithium battery.
7. The intelligent charging system according to claim 3 or 4, wherein: the voltage sensor is a contact sensor.
8. An intelligent charging method using the intelligent charging system according to any one of claims 1 to 4, characterized by comprising the steps of: in the charging process, the temperature of the lithium battery, the strain of the lithium battery and the open-circuit voltage of the lithium battery are measured in real time, and the intelligent controller regulates and controls the charging voltage or the charging current in real time according to the voltage, the strain and the temperature data to complete the charging process.
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| CN114935721B (en) * | 2022-05-30 | 2023-03-24 | 深圳先进技术研究院 | Lithium ion battery state-of-charge estimation method based on fiber bragg grating sensor |
| TWI811111B (en) * | 2022-09-20 | 2023-08-01 | 順達科技股份有限公司 | Method of battery cell voltage dynamic regulation |
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| CN102231551B (en) * | 2011-07-04 | 2014-06-04 | 上海工程技术大学 | Battery charger combining charging time and service life of battery |
| US9588186B2 (en) * | 2012-10-11 | 2017-03-07 | The Trustees Of Princeton University | Mechanical measurement of state of health and state of charge for intercalation batteries |
| CN103018681B (en) * | 2012-12-19 | 2015-04-15 | 上海交通大学 | Electric vehicle battery life decline and safe state detection technology based on deformation of battery cell in any shape |
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