CN103414223A - Charging control method of battery - Google Patents
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Abstract
The invention provides a charging control method of a battery. The charging control method comprises the following steps: analyzing the battery so as to obtain a changing curve of the positive electrode electric potential and the negative electrode electric potential of the battery under the different electric charging states; determining the maximum charging multiplying power of the battery under the different electric charging states and at different temperatures according to the changing curve of the positive electrode electric potential and the negative electrode electric potential, and generating a relational graph between the maximum charging multiplying power and the electric charging states and the temperatures of the battery according to the maximum charging multiplying power; determining allowable current maximum charging multiplying power of the battery according to the relational graph, the current temperature and the current electric charging state of the battery, and charging the battery according to the current maximum multiplying power. According to the charging control method of the battery, the charging multiplying power of the battery is actively controlled according to the current electric charging state and the current temperature of the battery, the charging multiplying power is in the maximum value from beginning to end, therefore, the rapidest charging is achieved, and the service life of the battery can not be greatly affected.
Description
Technical field
The present invention relates to the battery management technical field, particularly a kind of charge control method of battery.
Background technology
Charging method and charging device that a lot of rechargeable batteries occurred at present, technical development are comparatively ripe.But the charging modes of lithium ion battery is mainly constant current-constant voltage charge modes, the constant voltage duration of this charging method is longer, is difficult to realize the purpose of quick charge.Yet, along with people's daily life appliance and electronic adopts lithium ion battery as power supply device more and more, especially the higher demand of the development of electric automobile to lithium ion battery, the fast charge method of rechargeable lithium ion batteries becomes a study hotspot, and various achievements in research also emerge in an endless stream.CN200610034990.6, CN200810029444, CN200810198973.5 etc. are disclosed is the constant current charge method that adopts respectively distinct methods to compensate impedance drop, thereby realizes the purpose to quickly charging battery.But, while adopting these class methods to carry out quick charge, when charging current is larger, need to increase substantially the constant-current charging of battery cut-ff voltage, thereby may cause because voltage is higher, making inside battery generation side reaction, thereby affect the useful life of battery; And if the constant current charge cut-ff voltage is not high enough, battery is difficult to be full of electricity.CN201110079451.5 has proposed a kind of fast charge method of constant voltage charge, and the variation of electric current is passive in fact.According to experimental result, there is very large deficiency in this method, especially for lithium ion battery, if charging voltage is too high, although charging voltage does not surpass the ceiling voltage that battery allows, but while with battery charge state (SOC), increasing, the current potential of plus or minus electrode may surpass the current potential that produces strong side reaction with electrolyte, and causes battery life to be affected; And if charging voltage is lower, be difficult to again reach the purpose of quick charge.
In addition, rate of charge is the most direct parameter of battery charging speed, and the larger expression charging of rate of charge is faster, and therefore, ideally, rate of charge is the bigger the better.But due to the restriction of inside battery electrochemical reaction mechanism, when rate of charge was enough large, side reaction can occur in inside battery, thereby affects the useful life of battery.And as can be known according to experimental result, under different SOC states, the maximum charge multiplying power that battery can bear is different: along with the increase of SOC, the maximum charge multiplying power that battery can bear can be more and more lower.
Summary of the invention
The present invention is intended to one of solve the problems of the technologies described above at least.
For this reason, the object of the invention is to propose a kind of charge control method of battery, the method can be according to the current state-of-charge of battery and Current Temperatures, the rate of charge of ACTIVE CONTROL battery, make rate of charge be in all the time maximum, thereby realize charging the most fast, and can not cause too large impact to the life-span of battery.
To achieve these goals, embodiments of the invention have proposed a kind of charge control method of battery, comprise the following steps: battery is analyzed, to obtain the change curve of the both positive and negative polarity current potential of described battery under different state-of-charges; According to the change curve of described both positive and negative polarity current potential, determine the maximum charge multiplying power of described battery under different state-of-charges and different temperatures, and generate described maximum charge multiplying power and the state-of-charge of battery and the graph of a relation of temperature according to described maximum charge multiplying power; According to described graph of a relation, Current Temperatures and the current state-of-charge of described battery, determine the current maximum charge multiplying power that described battery allows, and according to described current maximum charge multiplying power, described battery is charged.
Charge control method according to the battery of the embodiment of the present invention, under different battery charge states and different temperatures, by control initiatively, constantly regulate rate of charge, make the battery rate of charge maintain all the time under the maximum charge multiplying power, thereby can realize improving to greatest extent battery charging rate, and can not cause too large impact to the life-span of battery.
In addition, the charge control method of battery according to the above embodiment of the present invention can also have following additional technical characterictic:
In an embodiment of the present invention, by three-electrode battery, test the both positive and negative polarity potential curve that obtains described battery
In an embodiment of the present invention, described battery is nickel-cadmium cell, Ni-MH battery, lead-acid battery or lithium battery.
In an embodiment of the present invention, described change curve according to described both positive and negative polarity current potential is determined the maximum charge multiplying power of described battery under different state-of-charges and different temperatures, and generate described maximum charge multiplying power and the state-of-charge of battery and the graph of a relation of temperature according to described maximum charge multiplying power, further comprise: obtain anodal current potential threshold value and/or the current potential threshold value of negative pole according to the change curve of described positive and negative electrode current potential; According to the current potential threshold value of described positive pole and/or the current potential threshold value of negative pole, obtain the maximum charge multiplying power under different state-of-charges and different temperatures; According to the maximum charge multiplying power under described different state-of-charges and different temperatures and corresponding state-of-charge and temperature, carry out the described point modeling, with the state-of-charge that generates described maximum charge multiplying power and battery and the graph of a relation of temperature.
Additional aspect of the present invention and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
The accompanying drawing explanation
Above-mentioned and additional aspect of the present invention and advantage are from obviously and easily understanding the description of embodiment, becoming in conjunction with following accompanying drawing, wherein:
Fig. 1 is the flow chart of the charge control method of battery according to an embodiment of the invention;
Fig. 2 is the change curve schematic diagram of both positive and negative polarity current potential of the battery of the charge control method of battery according to an embodiment of the invention; And
Fig. 3 is maximum charge multiplying power and the state-of-charge of battery and the graph of a relation of temperature of the charge control method of battery according to an embodiment of the invention.
Embodiment
Below describe embodiments of the invention in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label means same or similar element or the element with identical or similar functions from start to finish.Below by the embodiment be described with reference to the drawings, be exemplary, only be used to explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " " center ", " vertically ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second " be only be used to describing purpose, and can not be interpreted as indication or hint relative importance.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be done broad understanding, for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also to be electrically connected to; Can be directly to be connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.
Below in conjunction with accompanying drawing, describe the charge control method according to the battery of the embodiment of the present invention in detail.
Fig. 1 is the flow chart of the charge control method of battery according to an embodiment of the invention.As shown in Figure 1, the charge control method of battery according to an embodiment of the invention comprises the following steps:
Step S101, analyze battery, to obtain the change curve of the both positive and negative polarity current potential of battery under different state-of-charges.Particularly, in one embodiment of the invention, by three-electrode battery, test the both positive and negative polarity potential curve that obtains battery.Wherein, battery can for but be not limited to: nickel-cadmium cell, Ni-MH battery, lead-acid battery or lithium battery, in a preferred embodiment of the invention, use three electrode lithium batteries experiments to obtain the both positive and negative polarity potential curve of battery.
Step S102, determine the maximum charge multiplying power of battery under different state-of-charges and different temperatures according to the change curve of both positive and negative polarity current potential, and generate maximum charge multiplying power and the state-of-charge of battery and the graph of a relation of temperature according to the maximum charge multiplying power.
Particularly, at first, according to the change curve of positive and negative electrode current potential, obtain anodal current potential threshold value and/or the current potential threshold value of negative pole, and obtain the maximum charge multiplying power under different state-of-charges and different temperatures according to the current potential threshold value of this anodal current potential threshold value and/or negative pole, finally according to the maximum charge multiplying power under this difference state-of-charge and different temperatures and corresponding state-of-charge and temperature thereof, carry out the described point modeling, to generate maximum charge multiplying power and the state-of-charge of battery and the graph of a relation of temperature.Wherein, when the current potential that is greater than anodal current potential threshold value and/or battery cathode when the current potential of anode was less than the current potential threshold value of negative pole, now obvious side reaction occurred in inside battery.In other words, namely when battery charges normal, the both positive and negative polarity current potential should change in certain scope, if, and negative or positive electrode potential change curve has exceeded maximum separately (anodal current potential threshold value) or minimum value (the current potential threshold value of negative pole), show that namely obvious side reaction has occurred battery.Therefore, according to the potential change curve, determine under different rate of charge the state-of-charge of SOC(battery corresponding while starting side reaction occurs), mean that namely the lower maximum charge multiplying power that can take of this SOC tests rate of charge exactly, finally, according to the experimental result of maximum charge multiplying power and SOC, carry out described point and draw the state-of-charge of maximum charge multiplying power and battery and the graph of a relation of temperature.
Step S103, determine according to the state-of-charge of this maximum charge multiplying power and battery and the current state-of-charge of graph of a relation, Current Temperatures and battery of temperature the current maximum charge multiplying power that battery allows, and according to this current maximum charge multiplying power, battery charged.For example: can obtain Current Temperatures by measurement, and detect the current state-of-charge of battery, can pass through this maximum charge multiplying power and the state-of-charge of battery and the graph of a relation of temperature, find out under Current Temperatures, the maximum charge multiplying power that current state-of-charge is corresponding, and the rate of charge of battery is adjusted to the maximum charge multiplying power now obtained, thereby improve the charge rate of battery.
As concrete example, below in conjunction with Fig. 2 and Fig. 3, the charge control method according to the battery of the embodiment of the present invention is described.
As shown in Figure 2, suppose to be now 25 ℃, with 1 hour the multiplying power electric current (1C) three electrode lithium batteries are charged, obtain both positive and negative polarity potential change curve as shown in Figure 2.Curve can be found out in Fig. 2, when charging, when SOC was greater than SOC corresponding to A point, the current potential of anode has surpassed it, and to allow maximum potential 4.2V(be the current potential threshold value of positive electrode), also namely according to anodal potential curve, obtaining the charging scope of 1C rate of charge should be at the A point below SOC; Under B point SOC, the negative pole current potential lower than its to allow potential minimum 0V(be the current potential threshold value of negative electrode), namely according to the negative pole potential curve, obtaining the charging scope of 1C rate of charge should be at the B point below SOC.Because A point SOC is less than B point SOC, therefore, the charging scope of 1C rate of charge must be at the A point below SOC, and in other words, in the time of 25 ℃, under A point SOC, the maximum charge multiplying power is 1C.In like manner, said method can obtain the maximum charge multiplying power under other different temperatures and different SOC, and therefore not to repeat here.
Further, as shown in Figure 3, respectively the maximum charge multiplying power that obtains in said method and the experimental point of SOC and temperature are depicted on coordinate diagram, can obtain maximum charge multiplying power and SOC(state-of-charge by modeling) and the graph of a relation of temperature.Under 25 ℃ as shown in Figure 3, the profile that the maximum charge multiplying power changes along with the variation of SOC.
According to curve shown in Figure 3, can obtain the corresponding maximum charge multiplying power of each SOC state under 25 ℃, thereby can realize ACTIVE CONTROL, constantly change rate of charge, can make rate of charge maintain all the time under the maximum charge multiplying power, thereby can realize improving charge rate to greatest extent and can not cause obvious injury to battery life.
In addition, as can be seen from Figure 3, under different state-of-charges, the maximum charge multiplying power that battery can bear is different, and along with the increase of state-of-charge, the maximum charge multiplying power that battery can bear can be more and more lower.
Charge control method according to the battery of the embodiment of the present invention, under different battery charge states and different temperatures, by control initiatively, constantly regulate rate of charge, make the battery rate of charge maintain all the time under the maximum charge multiplying power, thereby can realize improving to greatest extent battery charging rate, and can not cause too large impact to the life-span of battery.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that do not break away from principle of the present invention and aim can be carried out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is by claim and be equal to and limit.
Claims (4)
1. the charge control method of a battery, is characterized in that, comprises the following steps:
Battery is analyzed, to obtain the change curve of the both positive and negative polarity current potential of described battery under different state-of-charges;
According to the change curve of described both positive and negative polarity current potential, determine the maximum charge multiplying power of described battery under different state-of-charges and different temperatures, and generate described maximum charge multiplying power and the state-of-charge of battery and the graph of a relation of temperature according to described maximum charge multiplying power;
According to described graph of a relation, Current Temperatures and the current state-of-charge of described battery, determine the current maximum charge multiplying power that described battery allows, and according to described current maximum charge multiplying power, described battery is charged.
2. the charge control method of battery as claimed in claim 1, is characterized in that, by three-electrode battery, tests the both positive and negative polarity potential curve that obtains described battery.
3. the charge control method of battery as claimed in claim 1, is characterized in that, described battery is nickel-cadmium cell, Ni-MH battery, lead-acid battery or lithium battery.
4. the charge control method of battery as claimed in claim 1, it is characterized in that, described change curve according to described both positive and negative polarity current potential is determined the maximum charge multiplying power of described battery under different state-of-charges and different temperatures, and generate described maximum charge multiplying power and the state-of-charge of battery and the graph of a relation of temperature according to described maximum charge multiplying power, further comprise:
According to the change curve of described positive and negative electrode current potential, obtain anodal current potential threshold value and/or the current potential threshold value of negative pole;
According to the current potential threshold value of described positive pole and/or the current potential threshold value of negative pole, obtain the maximum charge multiplying power under different state-of-charges and different temperatures;
According to the maximum charge multiplying power under described different state-of-charges and different temperatures and corresponding state-of-charge and temperature, carry out the described point modeling, with the state-of-charge that generates described maximum charge multiplying power and battery and the graph of a relation of temperature.
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| CN104852420A (en) * | 2014-02-14 | 2015-08-19 | 索尼公司 | Charging control apparatus, battery, electronic device, vehicle and charging control method |
| CN106549464A (en) * | 2017-01-13 | 2017-03-29 | 广东欧珀移动通信有限公司 | A kind of charge control method, device and computer equipment |
| CN106951975A (en) * | 2016-10-12 | 2017-07-14 | 蔚来汽车有限公司 | Electrical changing station number of batteries and rate of charge optimization system and method |
| WO2017147791A1 (en) * | 2016-03-01 | 2017-09-08 | 广东欧珀移动通信有限公司 | Charging method, adapter, mobile terminal and charging system |
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| CN112201868A (en) * | 2020-10-16 | 2021-01-08 | 惠州亿纬锂能股份有限公司 | Battery quick charging method, device, equipment and storage medium |
| CN112713323A (en) * | 2020-12-10 | 2021-04-27 | 欣旺达电动汽车电池有限公司 | Lithium ion battery rapid charging method and lithium ion battery |
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| CN104852420A (en) * | 2014-02-14 | 2015-08-19 | 索尼公司 | Charging control apparatus, battery, electronic device, vehicle and charging control method |
| WO2017147791A1 (en) * | 2016-03-01 | 2017-09-08 | 广东欧珀移动通信有限公司 | Charging method, adapter, mobile terminal and charging system |
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| CN107769293A (en) * | 2016-08-17 | 2018-03-06 | 通用汽车环球科技运作有限责任公司 | Dynamic power limitation adjustment in battery charging process |
| WO2018039902A1 (en) * | 2016-08-30 | 2018-03-08 | 宁德新能源科技有限公司 | Battery charging method and device, and battery system |
| CN106951975A (en) * | 2016-10-12 | 2017-07-14 | 蔚来汽车有限公司 | Electrical changing station number of batteries and rate of charge optimization system and method |
| CN106951975B (en) * | 2016-10-12 | 2021-04-16 | 蔚来(安徽)控股有限公司 | System and method for optimizing battery number and charging rate of battery replacement station |
| CN106549464A (en) * | 2017-01-13 | 2017-03-29 | 广东欧珀移动通信有限公司 | A kind of charge control method, device and computer equipment |
| CN113690479A (en) * | 2020-05-19 | 2021-11-23 | 北京小米移动软件有限公司 | Rechargeable battery and electronic device |
| CN113690479B (en) * | 2020-05-19 | 2024-01-30 | 北京小米移动软件有限公司 | Rechargeable battery and electronic device |
| CN112193124B (en) * | 2020-09-29 | 2022-05-17 | 蜂巢能源科技股份有限公司 | Battery charging method, device, medium, battery management system and vehicle |
| CN112193124A (en) * | 2020-09-29 | 2021-01-08 | 蜂巢能源科技有限公司 | Battery charging method, device, medium, battery management system and vehicle |
| CN112201868A (en) * | 2020-10-16 | 2021-01-08 | 惠州亿纬锂能股份有限公司 | Battery quick charging method, device, equipment and storage medium |
| CN112713323A (en) * | 2020-12-10 | 2021-04-27 | 欣旺达电动汽车电池有限公司 | Lithium ion battery rapid charging method and lithium ion battery |
| CN112713323B (en) * | 2020-12-10 | 2022-08-09 | 欣旺达电动汽车电池有限公司 | Lithium ion battery rapid charging method and lithium ion battery |
| WO2022226946A1 (en) * | 2021-04-29 | 2022-11-03 | 宁德时代新能源科技股份有限公司 | Charging strategy setting method and apparatus |
| CN114552732A (en) * | 2022-03-21 | 2022-05-27 | 深圳市建筑科学研究院股份有限公司 | Battery parameter correction method, device, equipment, storage medium and product |
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