CN203721844U - Low-temperature self-heating circuit for lithium ion battery module - Google Patents
Low-temperature self-heating circuit for lithium ion battery module Download PDFInfo
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- CN203721844U CN203721844U CN201420008722.7U CN201420008722U CN203721844U CN 203721844 U CN203721844 U CN 203721844U CN 201420008722 U CN201420008722 U CN 201420008722U CN 203721844 U CN203721844 U CN 203721844U
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- cell module
- ionic cell
- lithium ionic
- low temperature
- heater circuit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model relates to a low-temperature self-heating circuit for a lithium ion battery module. The low-temperature self-heating circuit is connected to two ends of the lithium ion battery module and is composed of a switch tube, a flyback transformer assembly, a temperature sensor and a microcontroller, wherein two ends of the lithium ion battery module are connected with the flyback transformer assembly; the switch tube is connected with the microcontroller, the flyback transformer assembly and the positive electrode of the lithium ion battery module respectively; the microcontroller is connected with the temperature sensor; the temperature sensor is arranged on the lithium ion battery module. Compared with the prior art, the low-temperature self-heating circuit has the advantages of low energy loss, high efficiency, high safety and the like.
Description
Technical field
The utility model relates to batteries of electric automobile administrative skill field, especially relates to a kind of low temperature for lithium ionic cell module from heater circuit.
Background technology
Lithium ion battery has the advantages such as voltage is high, capacity is large, volume is little, quality is light, and operating temperature range is wide, and lithium ion battery group has been widely used in every field, comprises the fields such as electric bicycle, electric tool and electric automobile.Lithium ion battery is comparatively responsive to the temperature of environment for use, in the time that temperature is lower, battery can discharge energy, power and discharging efficiency all lower, and also there is certain potential safety hazard in charging when low temperature, as produced dendrite etc.Therefore, low temperature uses problem greatly to affect application and the popularization of lithium ion battery.At present, while use, there are two kinds of major programmes under low temperature environment.One is without heating system, and in this scheme use procedure, battery power discharge efficiency is lower, and has a strong impact on power, useful life and the fail safe of battery pack.Another kind is designed to adopt the external heat of the forms such as heating wire auxiliary heating, and because battery self heat transfer property is poor, this scheme exists efficiency low and easily cause the defects such as battery temperature is inhomogeneous.And the inhomogeneities of battery pack working temperature can be brought impact to the aspect such as battery life, fail safe.
Electrochemical impedance spectroscopy (EIS) is the effective means of research lithium ion battery.In recent years, by the electrochemical impedance spectroscopy of research lithium ion battery, on frequency domain, analyzed the inside battery state obtaining and approved by majority.Typical case EIS spectrum is made up of following part: (1) hyperfrequency region (more than being typically 10kHz), transports relevant Ohmic resistance with lithium ion and electronics by electrolyte, porous septum, wire, active material particle etc.; (2) high-frequency region, a relevant semicircle of diffusive migration with lithium ion by active material particle surface insulation layer, represent that lithium ion diffusive migration is by the resistance of SEI film (solid electrolyte interface film, solid electrolyte interface); (3) intermediate frequency region, a semicircle relevant to charge transfer process, this process is electromigration and electrochemical reaction process; (4) low frequency region, an oblique line relevant to the solid diffusion process of lithium ion in active material particle inside, this procedural representation is the diffusion process of ion in solid phase.
By the measurement of battery EIS, can determine inside battery electronics and ion corresponding frequency or time constant in the time of different phase.On this basis, determine the frequency of battery charging and discharging, can effectively avoid the diffusion process of ion in solid phase, thereby avoid the formation of negative pole dendrite.
Summary of the invention
The purpose of this utility model is exactly to provide a kind of energy loss is little, efficiency is high, the safe low temperature for lithium ionic cell module from heater circuit in order to overcome the defect that above-mentioned prior art exists.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of low temperature for lithium ionic cell module is from heater circuit, be connected to the two ends of lithium ionic cell module, this low temperature comprises switching tube, flyback transformer assembly, temperature sensor and microcontroller from heater circuit, described lithium ionic cell module two ends are connected with flyback transformer assembly, described switching tube connects respectively microcontroller, flyback transformer assembly and lithium ionic cell module negative pole, described microcontroller is connected with temperature sensor, and described temperature sensor is located on lithium ionic cell module.
Described flyback transformer assembly comprises transformer and diode, described transformer primary side is connecting valve pipe and lithium ionic cell module positive pole respectively, transformer secondary connects respectively diode anode and lithium ionic cell module negative pole, and described diode cathode is connected with lithium ionic cell module is anodal.
Described switching tube is semiconductor switch device.
Described switching tube is MOSFET, and the grid of this switching tube connects microcontroller, and source electrode connects lithium ionic cell module negative pole, drain electrode connection transformer.
Described temperature sensor comprises occasionally infrared inductor of thermoelectricity.
Described lithium ionic cell module is in series by multiple monomer lithium ion batteries.
Compared with prior art, the utlity model has following beneficial effect:
1) the utility model is to utilize high frequency to discharge and recharge and control to carry out battery self and heat, due to the existence of lithium ion battery internal resistance and the mechanism of electrochemical reaction, in battery cycle charge-discharge process, can produce heat, thereby to heating of battery, make battery temperature more even from inside; And traditional approach heats by external device (ED), carry out transferring heat by battery shell wall, by contrast, energy loss of the present utility model is little, and efficiency is higher, and temperature rise is more even;
2) but, under low temperature condition, battery charging and discharging, especially large multiplying power, long-time charging may make negative pole produce dendrite, thereby affect the safety in utilization of battery, the utility model discharges and recharges the frequency of control higher than the lowest frequency points of cell electrochemical reaction process in electrochemical impedance spectroscopy test, can effectively avoid the formation of dendrite in low temperature charge and discharge process;
3) the utility model is in heating process, the temperature of Real-Time Monitoring battery and information of voltage, and carry out high frequency according to voltage and temperature information and discharge and recharge control, thereby further ensure the safety of battery.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is lithium ionic cell module B heating discharge regime certainly in embodiment, current direction schematic diagram when switching tube M opens;
Fig. 3 is the lithium ionic cell module B heating charging stage certainly in embodiment, current direction schematic diagram when switching tube M turn-offs;
Fig. 4 is battery charging and discharging curent change figure under PWM in embodiment (pulse-width modulation) pattern.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.The present embodiment is implemented as prerequisite taking technical solutions of the utility model, provided detailed execution mode and concrete operating process, but protection range of the present utility model is not limited to following embodiment.
As shown in Figure 1, a kind of low temperature for lithium ionic cell module is from heater circuit, be connected to the two ends of lithium ionic cell module B, lithium ionic cell module is in series by n joint monomer lithium ion battery, this low temperature comprises switching tube M from heater circuit, flyback transformer assembly, temperature sensor TT and microcontroller, described lithium ionic cell module B two ends are connected with flyback transformer assembly, described switching tube M connects respectively microcontroller, flyback transformer assembly and lithium ionic cell module B negative pole, described microcontroller is connected with temperature sensor TT, described temperature sensor TT is located on lithium ionic cell module B, the temperature of induction lithium ionic cell module B.
Described flyback transformer assembly comprises transformer T and diode D, the former limit of described transformer T connecting valve pipe M and lithium ionic cell module B positive pole respectively, transformer T secondary connects respectively diode D anode and lithium ionic cell module B negative pole, and described diode D negative electrode is connected with lithium ionic cell module B is anodal.
Described switching tube M is the semiconductor switch device of MOSFET or other types, and the grid of switching tube M connects microcontroller, and source electrode connects lithium ionic cell module B negative pole, drain electrode connection transformer T.Described temperature sensor TT is occasionally infrared inductor etc. of thermoelectricity, after the temperature of induction lithium ionic cell module B, temperature transition is become to the signal of telecommunication, sends to described microcontroller.
Microcontroller can receive the signal of temperature sensor in real time, and selects mode of operation according to temperature height.In the time that temperature is high, system enters low-power consumption mode, and described microcontroller enters resting state, but can wake up by low temperature, and all peripheral hardwares enter off-position.When temperature is during lower than specific threshold T min, system is waken up and enters normal mode of operation, peripheral hardware powers on, described microcontroller can control output rectangular pulse generation, stop, PFM (frequency modulation(FM)) and PWM (pulse-width modulation).It can be PFM (frequency modulation(FM)) or PWM (pulse-width modulation) that microcontroller produces rectangular pulse mode, and PFM (frequency modulation(FM)) or two kinds of mode of operations of PWM (pulse-width modulation) can be used for regulating the peak value of charging and discharging currents.In the time that lithium ionic cell module needs low-temperature heat, described microcontroller produces the rectangular pulse of certain duty ratio and frequency to the drive circuit of switching tube M according to actual temp height, comes unlatching or the shutoff of control switch pipe M by drive circuit.
Accompanying drawing 4 be in this example under heater circuit mode of operation, transformer voltage ratio is 1 o'clock, when duty ratio is 50%, the charging and discharging currents variation diagram of lithium ionic cell module B.Described low temperature can be operated under PFM or PWM pattern from heater circuit, and described microcontroller produces the rectangular pulse of fixed duty cycle, when being operated in PFM pattern lower time, regulates the peak value of charging and discharging currents by the frequency of regulating impulse.Frequency is larger, and peak current is less, and frequency is less, and peak current is larger.When being operated in PWM pattern lower time, by regulating the duty of rectangular pulse recently to regulate the peak value of charging and discharging currents.Duty ratio is larger, and peak current is larger, and duty ratio is less, and peak current is less.
Above-mentioned low temperature from the operation principle of heater circuit is: after normal mode of operation is opened, in the time that lithium ionic cell module B needs low-temperature heat, first actuating switch pipe M, lithium ionic cell module B electric discharge, electric current flows to negative pole from the positive pole of lithium ionic cell module B, on the former limit of transformer T, there is electric current to pass through, due to the secondary reversal of diode, secondary loop does not form electric current, flyback transformer stored energy, as shown in Figure 2, in figure, arrow represents current direction to current direction.Then on-off switching tube M, the induced electromotive force producing on secondary winding is reverse, diode D conducting, the magnetic energy of storage discharges to battery module, flows into, thereby realize the charging to battery module from the positive pole of lithium ionic cell module B, and current direction is as shown in Figure 3.For lithium ionic cell module B, described electric discharge charging stage from heater circuit form one complete from heating cycle.Put in charging cycle at continuous high frequency from heater circuit, and there is the highest frequency point of electrochemical reaction in this Frequency point higher than electrochemical impedance test, battery module does not have loss substantially at outside batteries, the heat that only has battery ohmic internal resistance and the internal resistance of lithium ion migration of liquid to produce, realizes efficient battery module thus from heating.
Claims (6)
1. the low temperature for lithium ionic cell module is from heater circuit, be connected to the two ends of lithium ionic cell module, it is characterized in that, this low temperature comprises switching tube, flyback transformer assembly, temperature sensor and microcontroller from heater circuit, described lithium ionic cell module two ends are connected with flyback transformer assembly, described switching tube connects respectively microcontroller, flyback transformer assembly and lithium ionic cell module negative pole, described microcontroller is connected with temperature sensor, and described temperature sensor is located on lithium ionic cell module.
2. a kind of low temperature for lithium ionic cell module according to claim 1 is from heater circuit, it is characterized in that, described flyback transformer assembly comprises transformer and diode, described transformer primary side is connecting valve pipe and lithium ionic cell module positive pole respectively, transformer secondary connects respectively diode anode and lithium ionic cell module negative pole, and described diode cathode is connected with lithium ionic cell module is anodal.
3. a kind of low temperature for lithium ionic cell module according to claim 2, from heater circuit, is characterized in that, described switching tube is semiconductor switch device.
4. a kind of low temperature for lithium ionic cell module according to claim 3 is from heater circuit, it is characterized in that, described switching tube is MOSFET, and the grid of this switching tube connects microcontroller, source electrode connects lithium ionic cell module negative pole, drain electrode connection transformer.
5. a kind of low temperature for lithium ionic cell module according to claim 1, from heater circuit, is characterized in that, described temperature sensor comprises occasionally infrared inductor of thermoelectricity.
6. a kind of low temperature for lithium ionic cell module according to claim 1, from heater circuit, is characterized in that, described lithium ionic cell module is in series by multiple monomer lithium ion batteries.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420008722.7U CN203721844U (en) | 2014-01-07 | 2014-01-07 | Low-temperature self-heating circuit for lithium ion battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420008722.7U CN203721844U (en) | 2014-01-07 | 2014-01-07 | Low-temperature self-heating circuit for lithium ion battery module |
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| Publication Number | Publication Date |
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| CN203721844U true CN203721844U (en) | 2014-07-16 |
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| CN201420008722.7U Expired - Fee Related CN203721844U (en) | 2014-01-07 | 2014-01-07 | Low-temperature self-heating circuit for lithium ion battery module |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106941202A (en) * | 2017-04-12 | 2017-07-11 | 安徽朗越能源股份有限公司 | A kind of light-operated lithium battery pack low-temperature protection device and low-temperature protection method |
| WO2017121021A1 (en) * | 2016-01-13 | 2017-07-20 | 深圳先进储能材料国家工程研究中心有限公司 | Low-temperature high-power output auxiliary apparatus for portable battery pack |
| CN107994299A (en) * | 2017-12-07 | 2018-05-04 | 山东大学 | Full-time crisscross parallel heating topological circuit of vehicle mounted dynamic battery low temperature and its application |
| CN110137627A (en) * | 2019-04-25 | 2019-08-16 | 上海广为美线电源电器有限公司 | Battery low temperature automatic preheater and system |
| CN111525196A (en) * | 2020-04-21 | 2020-08-11 | 深圳威迈斯新能源股份有限公司 | Battery self-heating circuit, electric automobile adopting same and control method thereof |
| CN113364084A (en) * | 2021-05-27 | 2021-09-07 | 华为技术有限公司 | Battery control circuit, battery and related electronic equipment |
-
2014
- 2014-01-07 CN CN201420008722.7U patent/CN203721844U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017121021A1 (en) * | 2016-01-13 | 2017-07-20 | 深圳先进储能材料国家工程研究中心有限公司 | Low-temperature high-power output auxiliary apparatus for portable battery pack |
| CN106941202A (en) * | 2017-04-12 | 2017-07-11 | 安徽朗越能源股份有限公司 | A kind of light-operated lithium battery pack low-temperature protection device and low-temperature protection method |
| CN106941202B (en) * | 2017-04-12 | 2023-05-30 | 安徽朗越能源股份有限公司 | Low-temperature protection device and low-temperature protection method for light-operated lithium battery pack |
| CN107994299A (en) * | 2017-12-07 | 2018-05-04 | 山东大学 | Full-time crisscross parallel heating topological circuit of vehicle mounted dynamic battery low temperature and its application |
| CN110137627A (en) * | 2019-04-25 | 2019-08-16 | 上海广为美线电源电器有限公司 | Battery low temperature automatic preheater and system |
| CN111525196A (en) * | 2020-04-21 | 2020-08-11 | 深圳威迈斯新能源股份有限公司 | Battery self-heating circuit, electric automobile adopting same and control method thereof |
| CN113364084A (en) * | 2021-05-27 | 2021-09-07 | 华为技术有限公司 | Battery control circuit, battery and related electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20220107 |