CN205589009U - Electric vehicle battery management device - Google Patents
Electric vehicle battery management device Download PDFInfo
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- CN205589009U CN205589009U CN201620400203.4U CN201620400203U CN205589009U CN 205589009 U CN205589009 U CN 205589009U CN 201620400203 U CN201620400203 U CN 201620400203U CN 205589009 U CN205589009 U CN 205589009U
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- 239000003990 capacitor Substances 0.000 claims description 14
- 239000004020 conductor Substances 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000013480 data collection Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 3
- 230000005355 Hall effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The utility model provides an electric vehicle battery management device, including the DSP controller to and and DSP controller homogeneous phase modules such as voltage acquisition, electric current collection, temperature data collection, battery equilibrium and GPSGPRS even, wherein, the DSP controller is formed by a DSP chip and peripheral circuit, the voltage acquisition module includes controllable switch S1, S2, S3, S4 to and electric capacity C, a AD converter and first singlechip MCU, electric current collection module includes hall current sensor, the 2nd AD converter and the second single -chip microcomputer MCU who connects according to the preface, temperature acquisition module includes digital temperature sensor and the third singlechip MCU who connects according to the preface, battery equalization module includes a plurality of equilibrium unit that connect in parallel mutually with the battery monomer, and equilibrium unit all includes a resistance R and an equalization switch K. Implement the utility model discloses, it leads to electric automobile can not in time supply the not enough of electric quantity with measuring inaccurately to overcome difficult measurement of electric vehicle battery parameter to improve battery life.
Description
Technical Field
The utility model relates to an electric motor car battery management technical field especially relates to an electric automobile battery management device.
Background
The battery management technology is a very important technology for ensuring the safety of the electric automobile and improving the use efficiency of energy. The battery management device accurately estimates the residual electric quantity of the power battery pack through accurately measuring various important parameters of the system, such as residual capacity, charging and discharging current, terminal voltage, temperature and the like, so as to ensure the endurance capacity of the electric vehicle, prevent the overcharge and over-discharge of the battery, ensure the safety of the whole vehicle and prolong the service life of the battery of the electric vehicle.
The inventor finds that the existing battery management device has the defects that: firstly, the terminal voltage of a storage battery usually adopts a common mode method, a differential mode method and a V/F method, but the common defects of the methods are that a battery pack (strong current) and a vehicle electrical system (weak current) cannot be effectively isolated, the number of series-parallel batteries on an electric vehicle is large, and devices such as resistors, operational amplifiers and the like adopted by voltage measurement are easily influenced by temperature and resistance precision to generate deviation; secondly, the current detection of the storage battery is an indirect measurement method represented by a sampling resistance method, but the method cannot realize the isolation from a control loop by connecting a sampling resistance in series in a main power loop, and is not suitable for a storage battery management device; the temperature inside the storage battery is usually difficult to measure, and is usually replaced by detecting the ambient temperature of the storage battery operation place, the common temperature detection method is to detect the temperature through a thermocouple and a thermal resistance sensor, and the thermocouple and the thermal resistance sensor are both easily limited by the use place and have the defect of large heat conduction error, so that the temperature detection is deviated; fourth, the traditional car battery management device often only focuses on the real-time detection of battery parameters, neglects the requirement of the battery for balance, and in order to meet the power requirement, the electric car needs to connect a plurality of single batteries in series and in parallel for use, because each single battery has inconsistency, the grouping use can bring hidden troubles in the aspects of performance, service life and safety.
Disclosure of Invention
The embodiment of the utility model provides a technical problem that will solve lies in, provides an electric automobile battery management device, overcomes the difficult measurement of electric automobile battery parameter and measures inaccurately and lead to electric automobile can not in time supplement the not enough of electric quantity to improve battery life.
The embodiment of the utility model provides an electric vehicle battery management device, including the DSP controller to and voltage acquisition module, electric current acquisition module, temperature acquisition module, battery equalization module and GPS/GPRS module that all link to each other with the DSP controller; wherein,
the DSP controller is formed by a DSP chip and a peripheral circuit thereof;
the voltage acquisition module comprises a controllable switch S1, a controllable switch S2, a controllable switch S3, a controllable switch S4, a capacitor C, a first A/D converter and a first single-chip microcomputer MCU; one ends of the controllable switch S1 and the controllable switch S2 are connected in parallel on the storage battery pack, and the other ends are connected in parallel on the capacitor C; one ends of a controllable switch S3 and a controllable switch S4 are connected in parallel with the capacitor C, and the other ends are connected with the first A/D converter; the controllable switch S1, the controllable switch S2, the controllable switch S3, the controllable switch S4 and the first A/D converter are also respectively connected with the first single-chip microcomputer MCU through control lines; the current acquisition module comprises a Hall current sensor, a second A/D converter and a second single chip microcomputer MCU which are sequentially connected; the Hall current sensor is connected between the storage battery pack and a load in series;
the temperature acquisition module comprises a DS18B20 digital temperature sensor and a third single chip microcomputer MCU which are connected in sequence; wherein the DS18B20 digital temperature sensor is placed close to the battery pack;
the battery balancing module comprises a plurality of balancing units, each balancing unit is connected with a storage battery monomer in parallel, and each balancing unit comprises a resistor R and a balancing switch K; and each balance switch K is driven by a PWM signal to be switched on or switched off.
The voltage acquisition module, the current acquisition module, the temperature acquisition module, the battery equalization module and the GPS/GPRS module are all connected with the DSP controller through a CAN bus of internal communication.
When the first single-chip microcomputer MCU controls the controllable switch S1 and the controllable switch S2 to be closed, the capacitor C is charged by the storage battery group; when the first single chip microcomputer MCU controls the controllable switch S3 and the controllable switch S4 to be both closed, the controllable switch S1 and the controllable switch S2 are further controlled to be both opened, and voltage collection of the storage battery pack is achieved.
Wherein the Hall current sensor comprises a magnetic core, a Hall element and a conductor; wherein the conductor is connected in series between the load and the battery; the magnetic core is sleeved on the outer surface of the conductor and performs magnetic attraction induction with the Hall element; the hall element is connected to the second a/D converter.
Implement the embodiment of the utility model provides a, following beneficial effect has:
the voltage, current and temperature detection device is adopted to detect the parameters of the storage battery of the electric automobile in real time, so that the residual capacity of the storage battery, the internal temperature of the storage battery, the terminal voltage of the storage battery and the charging and discharging current are accurately measured, the residual electric quantity of the storage battery of the electric automobile is accurately estimated to ensure the cruising ability of the electric automobile, the overcharge and overdischarge of the storage battery are prevented, the safety of the whole automobile is ensured, and the service life of the storage battery of the electric automobile is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings obtained from these drawings still belong to the scope of the present invention without inventive laboriousness.
Fig. 1 is a system structure connection block diagram of an electric vehicle battery management device in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit connection structure of the voltage acquisition module shown in FIG. 1;
FIG. 3 is a voltage variation graph of the capacitor C charged by the voltage acquisition module in FIG. 2;
FIG. 4 is a schematic diagram of a circuit connection structure of the current collection module in FIG. 1;
FIG. 5 is a schematic diagram of the operating principle of a Hall current sensor in the current collection module of FIG. 4;
FIG. 6 is a schematic diagram of a circuit connection structure of the temperature acquisition module in FIG. 1;
fig. 7 is a schematic diagram of a circuit connection structure of the battery equalization module in fig. 1;
fig. 8 is the embodiment of the utility model provides an electric motor car battery management device and electric automobile intelligent charging network deployment's topological structure schematic diagram.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 8, in an embodiment of the present invention, an electric vehicle battery management device is provided, which includes a DSP controller 1, and a voltage acquisition module 2, a current acquisition module 3, a temperature acquisition module 4, a battery equalization module 5, and a GPS/GPRS module 6, all connected to the DSP controller 1; wherein,
the DSP controller 1 is formed by a DSP chip and peripheral circuits thereof;
the voltage acquisition module 2 comprises a controllable switch S1, a controllable switch S2, a controllable switch S3, a controllable switch S4, a capacitor C, a first A/D converter and a first single-chip microcomputer MCU; one ends of the controllable switch S1 and the controllable switch S2 are connected in parallel on the storage battery pack, and the other ends are connected in parallel on the capacitor C; one ends of the controllable switch S3 and the controllable switch S4 are connected in parallel with the capacitor C, and the other ends are connected with the first A/D converter; the controllable switch S1, the controllable switch S2, the controllable switch S3, the controllable switch S4 and the first A/D converter are also respectively connected with the first single-chip microcomputer MCU through control lines;
the current acquisition module 3 comprises a Hall current sensor, a second A/D converter and a second single chip microcomputer MCU which are connected in sequence; the Hall current sensor is connected between the storage battery pack and a load in series;
the temperature acquisition module 4 comprises a DS18B20 digital temperature sensor and a third single chip microcomputer MCU which are connected in sequence; wherein, the DS18B20 digital temperature sensor is arranged close to the storage battery pack;
the battery balancing module 5 comprises a plurality of balancing units, each balancing unit is connected with a storage battery monomer in parallel, and each balancing unit comprises a resistor R and a balancing switch K; and each balance switch K is driven by a PWM signal to be switched on or switched off.
It should be noted that the voltage acquisition module 2, the current acquisition module 3, the temperature acquisition module 4, the battery equalization module 5 and the GPS/GPRS module 6 are all connected to the DSP controller 1 through a CAN bus for internal communication
The embodiment of the utility model provides an in, voltage detection module 2, current detection module 3, temperature detection module 4 are responsible for the parameter that detects the battery and are used for estimating battery residual capacity, and battery equalization module 5 is used for carrying out the equilibrium to inconsistent battery to improve the life of battery. In the GPS/GPRS module 6, the GPS is used for positioning the position of the automobile, the GPRS is used for contacting a monitoring center, and the system can automatically search a charging station which is closest to the system and shortest in online queuing time when the residual electric quantity is insufficient and charge the charging station so as to ensure cruising; under the condition that the electric automobile has faults, the GPS/GPRS module 6 can be used for contacting with a monitoring center and sending the current position information to the monitoring center
As shown in fig. 2, one I/O port of the first MCU is connected to both the controllable switch S1 and the controllable switch S2, and the other I/O port is connected to both the controllable switch S3 and the controllable switch S4, and the first MCU can control the on/off of the controllable switches S1 to S4. When the first single-chip microcomputer MCU controls the controllable switch S1 and the controllable switch S2 to be closed, the capacitor C is charged by the storage battery group, and as shown in FIG. 3, a typical charging curve of the capacitor C is obtained; when the first single-chip microcomputer MCU controls the controllable switch S3 and the controllable switch S4 to be closed, the controllable switch S1 and the controllable switch S2 are further controlled to be disconnected, voltage collection of the storage battery pack is achieved, and a voltage collection task is completed.
As shown in fig. 4, the hall current sensor of the current detection module 3 is connected in series between the battery and the load, and the second MCU processes data sent from the second a/D converter to complete the conversion from analog to digital.
As shown in fig. 5, the hall current sensor includes a magnetic core, a hall element, and a conductor; wherein the conductor is connected in series between the load and the battery; the magnetic core is sleeved on the outer surface of the conductor and performs magnetic attraction induction with the Hall element; the hall element is connected to the second a/D converter.
In use, the conductor is connected in series between the load and the battery, and the hall element is connected to the second a/D converter. When current flows in the conductor, the electromagnetic induction can generate a magnetic field, the magnetic field can be gathered on the magnetic core, the flowing current is converted into a voltage signal through the Hall effect of the Hall element and is transmitted to the A/D converter, and the current collection is completed through the processing of the second single chip microcomputer MCU. The hall current sensor is a sensor that converts a primary current into a secondary voltage signal using a hall effect.
As shown in fig. 6, the temperature detection module 4 includes a digital temperature sensor DS18B20 and a third single-chip microcomputer MCU; the DS18B20 temperature sensor has the characteristics of small volume, low hardware cost, strong anti-interference capability and high precision. And in use, the microprocessor can realize the two-way communication with the DS18B20 without any peripheral elements and only by one port line.
As shown in fig. 7, the battery equalization module 5 includes a plurality of equalization units, wherein each equalization unit includes an equalization switch K and a resistor, such as equalization switches K1 through Kn and resistors R1 through Rn. The balance switches are driven by PWM signals, ic is charging and discharging current, each single battery corresponds to a balance control unit formed by 1 balance switch K and a balance resistor R, and the charging and discharging current and the balance current of the single battery are ib and ie respectively.
If no equalizing circuit is provided, the current flowing through the storage battery is ic, after the equalizing circuit is added, the current flowing through the storage battery is ib, the current flowing through the equalizing resistor is ie, and the relationship between the current flowing through the equalizing resistor and the current flowing through the accumulator is as follows:
ib＝ic-ie
through controlling the closing of the equalization switch K, the magnitude of the equalization current ie can be controlled, so that the magnitude of the current ib actually flowing through the storage battery can be controlled, different charging and discharging can be carried out on the inconsistent single batteries through the method, the balance of each single battery is guaranteed, and the influence of the inconsistency of the single batteries on the performance of the battery pack in the use process of the battery is eliminated.
As shown in fig. 8, the intelligent charging network of the electric vehicle mainly includes a GPS satellite, a GPRS wireless signal tower, a monitoring center, and a charging station. The battery management device can automatically search the charging station with the shortest distance and the shortest online queuing time when the residual electric quantity is insufficient through networking, and charge the charging station so as to ensure the endurance; and the GPS/GPRS module 6 can also be used for contacting a monitoring center and sending the current position information to the monitoring center under the condition that the electric automobile has faults.
Implement the embodiment of the utility model provides a, following beneficial effect has:
the voltage, current and temperature detection device is adopted to detect the parameters of the storage battery of the electric automobile in real time, so that the residual capacity of the storage battery, the internal temperature of the storage battery, the terminal voltage of the storage battery and the charging and discharging current are accurately measured, the residual electric quantity of the storage battery of the electric automobile is accurately estimated to ensure the cruising ability of the electric automobile, the overcharge and overdischarge of the storage battery are prevented, the safety of the whole automobile is ensured, and the service life of the storage battery of the electric automobile is prolonged.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (4)
1. The battery management device of the electric automobile is characterized by comprising a DSP (digital signal processor) controller (1), and a voltage acquisition module (2), a current acquisition module (3), a temperature acquisition module (4), a battery equalization module (5) and a GPS/GPRS (global positioning system/general packet radio service) module (6) which are all connected with the DSP controller (1); wherein,
the DSP controller (1) is formed by a DSP chip and a peripheral circuit thereof;
the voltage acquisition module (2) comprises a controllable switch S1, a controllable switch S2, a controllable switch S3, a controllable switch S4, a capacitor C, a first A/D converter and a first single-chip microcomputer MCU; one ends of the controllable switch S1 and the controllable switch S2 are connected in parallel on the storage battery pack, and the other ends are connected in parallel on the capacitor C; one ends of a controllable switch S3 and a controllable switch S4 are connected in parallel with the capacitor C, and the other ends are connected with the first A/D converter; the controllable switch S1, the controllable switch S2, the controllable switch S3, the controllable switch S4 and the first A/D converter are also respectively connected with the first single-chip microcomputer MCU through control lines;
the current acquisition module (3) comprises a Hall current sensor, a second A/D converter and a second single chip microcomputer MCU which are connected in sequence; the Hall current sensor is connected between the storage battery pack and a load in series;
the temperature acquisition module (4) comprises a DS18B20 digital temperature sensor and a third single chip microcomputer MCU which are connected in sequence; wherein the DS18B20 digital temperature sensor is placed close to the battery pack;
the battery balancing module (5) comprises a plurality of balancing units, each balancing unit is connected with a storage battery monomer in parallel, and each balancing unit comprises a resistor R and a balancing switch K; and each balance switch K is driven by a PWM signal to be switched on or switched off.
2. The battery management device of the electric automobile according to claim 1, wherein the voltage acquisition module (2), the current acquisition module (3), the temperature acquisition module (4), the battery equalization module (5) and the GPS/GPRS module (6) are all connected with the DSP controller (1) through a CAN bus for internal communication.
3. The battery management device of an electric vehicle according to claim 1, wherein when the first MCU controls the controllable switch S1 and the controllable switch S2 to be both closed, the charging of the capacitor C by the battery pack is realized; when the first single chip microcomputer MCU controls the controllable switch S3 and the controllable switch S4 to be both closed, the controllable switch S1 and the controllable switch S2 are further controlled to be both opened, and voltage collection of the storage battery pack is achieved.
4. The battery management apparatus of claim 1, wherein the hall current sensor comprises a magnetic core, a hall element, and a conductor; wherein the conductor is connected in series between the load and the battery; the magnetic core is sleeved on the outer surface of the conductor and performs magnetic attraction induction with the Hall element; the hall element is connected to the second a/D converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620400203.4U CN205589009U (en) | 2016-04-28 | 2016-04-28 | Electric vehicle battery management device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620400203.4U CN205589009U (en) | 2016-04-28 | 2016-04-28 | Electric vehicle battery management device |
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| CN201620400203.4U Expired - Fee Related CN205589009U (en) | 2016-04-28 | 2016-04-28 | Electric vehicle battery management device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106394305A (en) * | 2016-12-05 | 2017-02-15 | 深圳市佰泽电子有限公司 | Electromobile battery pack capable of being quickly charged and quickly-charging method thereof |
| CN106740134A (en) * | 2016-11-22 | 2017-05-31 | 天津韶乐科技有限公司 | A kind of electric quantity of batteries of electric vehicle management system and its management method |
| CN106874638A (en) * | 2017-04-14 | 2017-06-20 | 深圳市瀚路新能源汽车有限公司 | The AD process circuits and electric automobile of multi-breal switch signal |
| CN110962610A (en) * | 2019-12-18 | 2020-04-07 | 安徽天健环保车辆部件有限公司 | New energy bus electric quantity analysis system and method |
-
2016
- 2016-04-28 CN CN201620400203.4U patent/CN205589009U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106740134A (en) * | 2016-11-22 | 2017-05-31 | 天津韶乐科技有限公司 | A kind of electric quantity of batteries of electric vehicle management system and its management method |
| CN106394305A (en) * | 2016-12-05 | 2017-02-15 | 深圳市佰泽电子有限公司 | Electromobile battery pack capable of being quickly charged and quickly-charging method thereof |
| CN106874638A (en) * | 2017-04-14 | 2017-06-20 | 深圳市瀚路新能源汽车有限公司 | The AD process circuits and electric automobile of multi-breal switch signal |
| CN110962610A (en) * | 2019-12-18 | 2020-04-07 | 安徽天健环保车辆部件有限公司 | New energy bus electric quantity analysis system and method |
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