CN112467256A - Temperature difference control method of battery system - Google Patents
Temperature difference control method of battery system Download PDFInfo
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- CN112467256A CN112467256A CN202011364090.4A CN202011364090A CN112467256A CN 112467256 A CN112467256 A CN 112467256A CN 202011364090 A CN202011364090 A CN 202011364090A CN 112467256 A CN112467256 A CN 112467256A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
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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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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Automation & Control Theory (AREA)
- Secondary Cells (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
Abstract
The invention discloses a temperature difference control method of a battery system, which comprises the following steps that a controllable resistance resistor and a resistance switch are connected in series on a basic unit of each battery system, a temperature sensor is installed, and the controllable resistance resistor, the resistance switch and the temperature sensor are connected with a control unit of the battery system; the temperature sensor measures the battery temperature T of the basic unit and transmits data to the control unit, and the control unit receives all the battery temperatures and sequences the battery temperaturesWhen the maximum value T ismaxAnd a minimum value TminWhen the temperature difference is larger than 5 ℃, the control unit controls the resistance with controllable resistance value through the resistance switch to adjust the temperature of the basic unit. The temperature difference control method is used for temperature adjustment when the temperature of the battery system is not high and the temperature difference is large, and the corresponding heating rate can be determined according to the measured temperature of each basic unit in the battery system, so that the temperature difference is reduced.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a temperature difference control method of a battery system.
Background
The rapid development of the new energy automobile industry brings about explosive growth of the secondary battery industry, and the sales volume and the loading volume of a power battery system, which is a core component of a new energy automobile, are also in a state of increasing year by year. With the popularization of new energy automobiles, the service life of a battery system is more and more concerned by users, and one factor which has a large influence is consistency difference caused by system temperature difference.
With the continuous expansion of the application field of new energy vehicles, the battery system is more and more diversified in environmental working conditions. Especially, how to ensure the uniformity of the temperature field of the battery system in the extremely cold field is a problem which is difficult to overcome. At present, the mainstream natural cooling mode is difficult to ensure the temperature field consistency of the battery system in the charging or driving process, and the situation of large temperature difference in local parts is difficult to avoid even in the liquid cooling mode, so that the performance of the battery system is difficult to be maximized, and the long-term service life of the battery system is further influenced.
At present, the solution of the temperature difference of the battery system is relatively limited, and how to control the temperature difference of the battery system to improve the service performance and the service life of the battery system is a problem to be solved urgently.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a temperature difference control method for a battery system.
In order to solve the technical problems, the invention adopts the following technical scheme:
a temperature difference control method of a battery system, the basic unit of which comprises battery modules, adjacent battery modules are connected in parallel, the temperature difference control method comprising the steps of,
each basic unit is connected with a resistance with controllable resistance and a resistance switch in series, a temperature sensor is arranged on each basic unit, and the resistance with controllable resistance, the resistance switch and the temperature sensor are connected with a control unit of the battery system;
each temperature sensor measures the battery temperature T corresponding to the basic unit and transmits data to the control unit, the control unit receives and sequences the battery temperatures detected by all the temperature sensors, and when the maximum value T is receivedmaxAnd a minimum value TminWhen the temperature difference is not less than 5 ℃, the control unit controls the resistance with the controllable resistance value through the resistance switch to adjust the temperature of the corresponding basic unit.
Further, the temperature of each basic unit is adjusted to be a resistance with controllable resistance to heat the basic unit, the heating rate is related to the size of the corresponding resistance with controllable resistance, and the size of the resistance with controllable resistance is calculated by the following formula: r ═ Tmax-T)*c*m/I2*t1Wherein c is the specific heat capacity of the basic unit, m is the mass of the basic unit, I is the real-time current of the battery system, t1The heating time of the basic unit.
Further, the heating time t of the basic unit1Is 900s-3600 s.
Further, the control unit is arranged to control the motor at intervals t2And receiving and sorting temperature data measured by the temperature sensor, comparing the temperature data, and determining whether to adjust the temperature according to temperature difference data obtained by comparison.
Further, the time t2In the range of 1min to t2≤5min。
Further, the time t2Is in the range of 2 min.
Further, when receiving the maximum value TmaxAnd a minimum value TminWhen the temperature difference is 5-20 ℃, the control unit controls the resistance with the controllable resistance value through the resistance switch to adjust the temperature of the corresponding basic unit.
Has the advantages that:
the temperature difference control method is used for adjusting the temperature of the battery system when the temperature is not high and the temperature difference is large, and solves the problem of large temperature difference through a heating mode, wherein the heating rate is related to the size of a resistance with a controllable resistance value, so that the corresponding heating rate is determined according to the measured temperature of each basic unit in the battery system, and the temperature difference is reduced.
Detailed Description
The present invention is further illustrated by the following specific examples, which are, however, not intended to limit the scope of the invention.
The temperature difference control method of the battery system of the invention is specifically explained as follows:
the basic unit of the battery system comprises the battery modules, and the adjacent battery modules are connected in parallel.
The temperature difference control method comprises the following steps:
(1) each basic unit is connected with a resistance with controllable resistance and a resistance switch in series, a temperature sensor is arranged on each basic unit, and the resistance with controllable resistance, the resistance switch and the temperature sensor are connected with a control unit of the battery system;
(2) each temperature sensor measures the battery temperature T corresponding to the basic unit and transmits temperature data to the control unit, the control unit receives and sequences the battery temperatures detected by all the temperature sensors, when the temperature difference between the maximum value Tmax and the minimum value Tmin is larger than 5 ℃, the control unit controls the controllable resistance value resistors through the resistance switches to adjust the temperature of the corresponding basic units, wherein the temperature adjustment mode of each basic unit is that the basic units are heated through the controllable resistance value resistors, the heating rate is related to the size of the corresponding controllable resistance value resistors, and the size of the controllable resistance value resistors is calculated through the following formula: r ═ Tmax-T)*c*m/I2*t1Wherein c is the specific heat capacity of the basic unit, m is the mass of the basic unit, I is the real-time current of the battery system, t1Is the heating time of the basic unit, the heating time t of the basic unit1Is 900s-3600 s;
it should be noted that the present application is mainly directed to the maximum value T of all the battery temperaturesmaxAt a set power limit temperature T in the battery system0The current BMS will formulate a corresponding power matrix table for the battery pack output, wherein the allowed output power, the above-mentioned limited power temperature T, will be specified for different temperatures0Is the maximum value of the full power output temperature interval.
(3) After all the battery modules are subjected to temperature adjustment once, every time t2Receiving and sorting temperature data measured by a temperature sensor, comparing the temperature data, and determining whether to continue temperature adjustment according to temperature difference data obtained by comparison, wherein the time t is2In the range of 1min to t2Less than or equal to 5min, and the optimal interval time is 2 min.
The following examples are provided to illustrate the invention.
There are 20 basic cells in the battery system, each denoted as S1,S2,…,S20The corresponding real-time temperature is denoted as T1,T2,…,T20To T1,T2,…,T20Sorting is carried out, when the highest temperature T thereinmaxWhen the temperature is less than or equal to 45 ℃ (the temperature is the limited power temperature), the temperature difference between the maximum value and the minimum value is calculated, the calculated temperature difference value is more than 5 ℃, adjustment is needed, and therefore the resistance of each basic unit is calculated according to a formula, wherein the specific heat capacity of the basic unit is 1.1kJ/kg/K, the mass is 2kg, the current is set to be 5A, the heating time is set to be 1800s, and the temperatures from high to low are respectively 40 ℃, 38 ℃, 37 ℃, 36 ℃, 35 ℃, 33 ℃, 32 ℃, 29 ℃, 28 ℃, 26 ℃, 25 ℃ and 25 ℃; the resistances R that each basic cell needs to adjust from high to low are:
R1＝((40-40)+273)*1.1*2*1000/(5*5*1800)＝0Ω；
R2＝((40-38)+273)*1.1*2*1000/(5*5*1800)＝13.44Ω；
R5＝((40-37)+273)*1.1*2*1000/(5*5*1800)＝13.49Ω；
R7＝((40-36)+273)*1.1*2*1000/(5*5*1800)＝13.54Ω；
R8＝((40-35)+273)*1.1*2*1000/(5*5*1800)＝13.59Ω；
R9＝((40-33)+273)*1.1*2*1000/(5*5*1800)＝13.69Ω；
R11＝((40-32)+273)*1.1*2*1000/(5*5*1800)＝13.74Ω；
R12＝((40-29)+273)*1.1*2*1000/(5*5*1800)＝13.88Ω；
R15＝((40-28)+273)*1.1*2*1000/(5*5*1800)＝13.93Ω；
R16＝((40-26)+273)*1.1*2*1000/(5*5*1800)＝14.03Ω；
R19＝((40-25)+273)*1.1*2*1000/(5*5*1800)＝14.08Ω；
in the above calculation, 273 is a constant and is a converted difference between the celsius temperature and the kelvin temperature.
While setting the control unit at intervals t2And (5) repeatedly carrying out data acquisition and calculation for 2min, and readjusting when the temperature difference is not less than 5 ℃.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A temperature difference control method of a battery system, wherein a basic unit of the battery system comprises battery modules, adjacent battery modules are connected in parallel, the temperature difference control method comprises the following steps,
each basic unit is connected with a resistance with controllable resistance and a resistance switch in series, a temperature sensor is arranged on each basic unit, and the resistance with controllable resistance, the resistance switch and the temperature sensor are connected with a control unit of the battery system;
each temperature sensor measures the battery temperature T corresponding to the basic unit and transmits data to the control unit, the control unit receives and sequences the battery temperatures detected by all the temperature sensors, and when the maximum value T is receivedmaxAnd a minimum value TminWhen the temperature difference is not less than 5 ℃, the control unit controls the resistance with the controllable resistance value through the resistance switch to adjust the temperature of the corresponding basic unit.
2. The temperature difference control method of a battery system according to claim 1, wherein the temperature of each of the basic units is adjusted to a resistance of controllable resistance to heat the basic unit, and the heating rate is related to the magnitude of the corresponding resistance of controllable resistance, and the magnitude of the resistance of controllable resistance is calculated by the following formula: r ═ Tmax-T)*c*m/I2*t1Wherein c is the specific heat capacity of the basic unit, m is the mass of the basic unit, I is the real-time current of the battery system, t1The heating time of the basic unit.
3. The temperature difference control method of a battery system according to claim 2, wherein the heating time t of the basic unit1Is 900s-3600 s.
4. The temperature difference control method of a battery system according to claim 1, wherein the control unit controls the temperature difference between the battery cells at intervals t2And receiving and sorting temperature data measured by the temperature sensor, comparing the temperature data, and determining whether to adjust the temperature according to temperature difference data obtained by comparison.
5. The temperature difference control method of a battery system according to claim 4, wherein the time t is2In the range of 1min to t2≤5min。
6. The temperature difference control method of a battery system according to claim 5, wherein the time t is2Is in the range of 2 min.
7. The temperature difference control method of a battery system according to claim 1, wherein the maximum value T is received whenmaxAnd a minimum value TminWhen the temperature difference is 5-20 ℃, the control unit controls the resistance with the controllable resistance value through the resistance switch to adjust the temperature of the corresponding basic unit.
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| CN208706821U (en) * | 2018-06-20 | 2019-04-05 | 福建易动力电子科技股份有限公司 | A kind of heating system of power battery module |
| CN208889815U (en) * | 2018-11-08 | 2019-05-21 | 中航锂电（洛阳）有限公司 | A kind of a kind of battery system and vehicle adjusted equipped with the temperature difference |
| CN109950647A (en) * | 2019-03-27 | 2019-06-28 | 联想(北京)有限公司 | A kind of battery system and processing method |
| CN111129660A (en) * | 2020-04-01 | 2020-05-08 | 惠州亿纬锂能股份有限公司 | Battery system, vehicle system, and battery system heating control method |
| CN211265578U (en) * | 2020-01-14 | 2020-08-14 | 合肥国轩高科动力能源有限公司 | Snake-shaped plate heating film for cylindrical battery cell module |
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2020
- 2020-11-27 CN CN202011364090.4A patent/CN112467256A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785231A (en) * | 2016-12-22 | 2017-05-31 | 青岛大学 | A kind of electrokinetic cell heater and control method |
| CN208706821U (en) * | 2018-06-20 | 2019-04-05 | 福建易动力电子科技股份有限公司 | A kind of heating system of power battery module |
| CN208889815U (en) * | 2018-11-08 | 2019-05-21 | 中航锂电（洛阳）有限公司 | A kind of a kind of battery system and vehicle adjusted equipped with the temperature difference |
| CN109950647A (en) * | 2019-03-27 | 2019-06-28 | 联想(北京)有限公司 | A kind of battery system and processing method |
| CN211265578U (en) * | 2020-01-14 | 2020-08-14 | 合肥国轩高科动力能源有限公司 | Snake-shaped plate heating film for cylindrical battery cell module |
| CN111129660A (en) * | 2020-04-01 | 2020-05-08 | 惠州亿纬锂能股份有限公司 | Battery system, vehicle system, and battery system heating control method |
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Application publication date: 20210309 |