CN103368229B - Ground electric vehicle battery diagnosis device and diagnostic method thereof - Google Patents

Abstract

The invention relates to a power battery diagnosis device, in particular to a ground electric vehicle battery diagnosis device and a diagnostic method thereof. The ground electric vehicle battery diagnosis device comprises a plurality of isolated power modules and a control module connected with an external computer; the isolated power modules are used for acquiring and inputting the voltage, current and temperature information of each battery in a battery pack into the control module; the control module is used for receiving and processing the information acquired by the isolated power modules, and the isolated power modules are electrically isolated from one another. The ground electric vehicle battery diagnosis device can independently diagnose or/and maintain each battery in the battery pack under the circumstance that the battery pack is not dismounted from a vehicle, thus providing each battery in the power battery pack of the electric vehicle with various diagnostic evaluation functions, such as charge state evaluation, health state evaluation and internal resistance evaluation, and a maintenance function for keeping the consistency of the batteries.

Description

Ground diagnostic equipment and diagnostic method for electric vehicle battery

technical field

The invention relates to a diagnostic device for a power battery, in particular to a ground diagnostic device for an electric vehicle battery and a diagnostic method thereof.

Background technique

With the development of the automobile industry, electric vehicles have gradually gained the attention and recognition of the society due to their advantages of zero emission, low noise and low cost of use. Electric vehicle power battery packs are usually composed of multiple single power batteries connected in series and in parallel. Due to differences in manufacturing processes and working conditions, the batteries in the battery pack will gradually produce differences during use, resulting in a decrease in the performance of the battery pack; in addition, Due to the compact structure of electric vehicles, the cost of removing the battery from the electric vehicle for testing is very high, making online detection or (and) maintenance of each battery in the battery pack a requirement.

The online detection and maintenance method determines that there is a potential difference between each channel, and since the purpose of maintenance and detection is to detect the status of each battery, each channel needs to be operated independently. The multi-channels of existing battery diagnostic equipment are mostly multi-channel non-isolated, which cannot meet the needs of battery pack online monitoring or (and) maintenance; and the equipment running multiple series channel detection has only one current loop, no method to charge or (and) discharge a single battery independently, none of these devices can meet the detection or (and) maintenance requirements of the electric vehicle online battery pack; in addition, due to the relationship between the circuit topology, the existing battery diagnostic equipment When the battery is plugged into the battery and it is not powered on, it will consume the energy of the battery itself. This shortcoming makes it necessary to separate the testing device after the battery is tested while the device is still powered on, which will cause damage to the battery.

Contents of the invention

The purpose of the present invention is to provide a ground diagnostic equipment and diagnostic method for electric vehicle batteries in view of the deficiencies in the prior art. Diagnosis or (and) maintenance operations can be performed on certain batteries, and diagnosis or (and) maintenance operations can also be performed on isolated single batteries.

In order to achieve the above object, the present invention adopts the following technical solutions: a ground diagnostic equipment for electric vehicle batteries, which includes several isolated power modules and a control module connected to an external computer; the isolated power modules are used to collect the Voltage, current and temperature information are input into the control module; the control module is used to receive and process the information collected by the isolated power modules, and the isolated power modules are electrically isolated from each other.

Further, each of the batteries is connected to one or more isolated power modules; the batteries are lithium-ion power batteries with a voltage less than 5V.

Further, the control module includes an external memory.

Further, the isolated power module is connected to the control module through a communication bus.

Further, the isolated power module includes an isolated power module, a power control module, a sampling module, an operation control module, and an isolated communication module; the isolated power module is used to convert the mains power into low-voltage direct current and complete electrical isolation for the operation control module and The power control module provides electric energy; the power control module is used to collect the voltage, current and temperature information of each battery in the battery pack or to charge or discharge the battery, and the sampling module is used to detect the working status of the power control module and the detected information Feedback to the operation control module; the operation control module is connected to the communication bus through the isolation communication module, receives information from the control module, and feeds back its own working information to the control module.

Further, the isolated power module further includes an energy consumption module connected to the power control module.

A diagnostic method for electric vehicle battery ground diagnostic equipment, comprising the steps of:

A. The control module sends a request message to the isolated power module;

B. The isolated power module receives the request message from the control module, and collects the voltage, current and temperature information of each battery in the battery pack according to the content of the request message, and feeds the collected information back to the control module through the response message;

C. The control module receives the response message from the isolated power module, saves the received response message to the external memory and translates it, and transmits the translated response message to the computer;

D. The computer obtains the user's demand information through the man-machine interface, and according to the user's demand information, diagnoses the received response message through the main body diagnosis and maintenance algorithm of the computer, and sends the diagnosed command to the control module;

E. The control module receives and translates instructions from the computer, and transmits the translated instructions to the isolated power module;

F. The isolated power module receives instructions from the control module and charges or discharges the battery, and the information generated by the operation is translated by the control module and fed back to the computer.

Further, the step B is specifically:

B1. The isolated power supply module converts the mains power into low-voltage direct current and completes the electrical isolation to provide power to the operation control module and power control module;

B2. The operation control module receives the request message from the control module through the isolation communication module, and transmits the request message to the power control module;

B3. The power control module receives the request message from the operation control module, and collects the voltage, current and temperature information of each battery in the battery pack according to the content of the request message;

B4, the sampling module detects the acquisition state of the power control module, and feeds back the detected information to the operation control module through the response message;

B5. The operation control module feeds back the response message to the control module through the isolation communication module.

Further, in the step F, the specific steps for charging the battery are:

F1. The power control module receives instructions from the operation control module, charges the battery according to the instructions, and outputs part or all of the energy of the mains to the battery;

F2. The sampling module detects the charging state of the power control module and feeds back the detected information to the operation control module;

F3. The operation control module compares and judges according to the feedback information and the user's demand information, and adjusts the charging speed of the battery by the power control module in real time.

Further, in the step F, the specific steps of discharging the battery are:

Fⅰ, the power control module receives the instruction of the operation control module, discharges the battery, and outputs part or all of the energy of the battery to the energy consumption module;

Fii. The sampling module detects the discharge state of the power control module and feeds back the detected information to the operation control module;

FⅢ. The operation control module compares and judges according to the feedback information and the user's demand information, and adjusts the discharge speed of the battery by the power control module in real time.

The beneficial effects of the present invention are:

1. The electric vehicle battery ground diagnostic equipment of the present invention can independently diagnose or (and) maintain each battery in the battery pack without removing the battery pack from the vehicle, thereby providing Each battery provides various diagnostic evaluation functions such as state-of-charge evaluation, health state evaluation, and internal resistance evaluation, as well as maintenance functions to maintain battery consistency.

2. The electric vehicle battery ground diagnostic equipment of the present invention will not consume battery energy when the battery is connected and the battery itself is powered off. The electric vehicle battery ground diagnostic equipment of the present invention can make the battery charge and discharge operation only when the battery is allowed to charge and discharge, and does not consume the energy of the battery at other times.

3. All the detection and diagnosis modules of the electric vehicle battery ground diagnostic equipment of the present invention are independent of the outside of the vehicle, that is, during the operation of the electric vehicle, the equipment does not move with the vehicle, but remains on the ground. The electric vehicle battery ground diagnostic equipment of the present invention can save all data in the operation process, and can be exported conveniently to establish a battery information database.

4. The electric vehicle battery ground diagnostic equipment of the present invention can detect the voltage, current and temperature information of each channel corresponding to the battery during the charging and discharging process of the battery, thereby providing diagnostic functions such as state of charge evaluation, health status evaluation, and internal resistance evaluation . The electric vehicle battery ground diagnostic equipment of the present invention can balance the entire battery pack to achieve the function of maintaining the electric vehicle battery pack through the independent charging and discharging function of each channel and its diagnostic function.

5. The electric vehicle battery ground diagnostic equipment of the present invention can independently charge and discharge the batteries connected to each channel. Each channel of the isolated power module of the present invention is completely isolated, so that the present invention can use several channels to access a battery at the same time, at this time, the charging and discharging rate of the battery will be doubled, and the time required for operation will be shortened.

6. Each channel of the isolated power module of the present invention is independently equipped with a charging and discharging circuit, allowing each channel to complete different operations at the same time, saving time to the greatest extent when maintaining battery consistency, and improving energy utilization at the same time, which is more in line with The original intention of electric vehicles to be green and environmentally friendly.

Description of drawings:

Fig. 1 is a functional block diagram of the present invention.

Fig. 2 is a hardware block diagram of the isolated power module in the present invention.

The reference signs are:

10, 11, 12...1N——Battery

20, 21, 22...2N——isolated power module

201——isolated power module

202 - power control module

203 - energy consumption module

204 - Sampling module

205 - Operation Control Module

206——isolated communication module

30 - control module

40 - computer.

Detailed ways:

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings 1-2, and the contents mentioned in the implementation modes are not limitations of the present invention.

See Fig. 1~2, a kind of electric vehicle battery ground diagnosis equipment, it comprises several isolated power modules (20, 21, 22...2N) and a control module 30 connected with external computer 40; Isolated power modules (20, 21 , 22...2N) are used to collect the voltage, current and temperature information of each battery (10, 11, 12...1N) in the battery pack, and input them into the control module 30; the control module 30 is used to receive the isolated power module (20, 21, 22...2N) and process the information collected, and the isolated power modules (20, 21, 22...2N) are electrically isolated.

The electric vehicles involved in the present invention include pure electric vehicles and hybrid vehicles using storage batteries.

In this embodiment, each of the batteries (10, 11, 12...1N) is connected to one or more isolated power modules (20, 21, 22...2N); the batteries (10, 11, 12... 1N) is a lithium-ion power battery with a voltage less than 5V. The present invention can independently perform diagnosis or (and) maintenance operations for one or several batteries in the battery pack, and can also perform diagnosis or (and) maintenance operations for a single separated battery.

In this embodiment, the control module 30 includes an external memory.

In this embodiment, the isolated power modules ( 20 , 21 , 22 . . . 2N) are connected to the control module 30 through a communication bus.

Since each isolated power module (20, 21, 22...2N) is electrically isolated, multiple isolated power modules (20, 21, 22...2N) are allowed to be connected to the same battery (10, 11, 12...1N), that is, connected in parallel to the same battery (10, 11, 12...1N), through the control of the computer 40, these isolated power modules (20, 21, 22...2N) can cooperate at the same time, so that The operating power reaches several times that of a single channel, which speeds up the test progress; and the present invention can completely ignore the electrical connection between batteries (10, 11, 12...1N), and only needs to be finally input to the isolated power module (20, 21, 22...2N) voltage value meets the working range of the device of the present invention.

The electric vehicle battery ground diagnosis equipment of the present invention can not only test each independent battery (10, 11, 12...1N), but also can test each battery (10, 11, 12 ... 1N), without the need to release its own electrical connection.

Regardless of whether the electric vehicle battery ground diagnostic equipment of the present invention is connected to the isolated power module (20, 21, 22...2N) is a single battery or a battery pack formed by several batteries connected in series or parallel or other voltage sources, As long as it meets the requirements of the present invention on the input voltage.

Multiple electric vehicle battery ground diagnostic equipment of the present invention can also be used in parallel to achieve the purpose of speeding up the operation.

In this embodiment, the isolated power modules (20, 21, 22...2N) include an isolated power module 201, a power control module 202, a sampling module 204, an operation control module 205, and an isolated communication module 206; To convert the mains power into low-voltage direct current and complete the electrical isolation, and provide electric energy to the operation control module 205 and the power control module 202; the power control module 202 is used to collect the voltage, current and temperature information of each battery in the battery pack or conduct Charging or discharging operation, the sampling module 204 is used to detect the working state of the power control module 202 and feed back the detected information to the operation control module 205; the operation control module 205 is connected to the communication bus through the isolation communication module 206, and receives information from the control module 30, and feed back its own work information to the control module 30.

The isolated power module (20, 21, 22...2N) is the core functional module of the electric vehicle battery ground diagnostic equipment of the present invention, and the energy inside the entire isolated power module (20, 21, 22...2N) is passed through the isolated power module 201 isolation, and isolation means are used when connecting with other parts of the isolated power module (20, 21, 22...2N), so the entire isolated power module (20, 21, 22...2N) is isolated from the electrical above is isolated.

In this embodiment, the isolated power module further includes an energy consumption module 203 connected to the power control module 202 . The energy consumption module 203 is a light emitting diode, a power resistor or an electric furnace wire.

A diagnostic method for electric vehicle battery ground diagnostic equipment, comprising the steps of:

A. The control module 30 sends a request message to the isolated power modules (20, 21, 22...2N);

B. The isolated power module (20, 21, 22...2N) receives the request message from the control module 30, and collects the data of each battery (10, 11, 12...1N) in the battery pack according to the content of the request message Voltage, current and temperature information, the collected information is fed back to the control module 30 through the response message;

C. The control module 30 receives the response message from the isolated power module (20, 21, 22...2N), saves the received response message in an external memory and translates it, and transmits the translated response message to the computer 40;

D. The computer 40 obtains the user's demand information through the man-machine interface, and according to the user's demand information, diagnoses the received response message through the main body diagnosis and maintenance algorithm of the computer 40, and sends the diagnosed command to the control module 30;

E. The control module 30 receives and translates the instructions from the computer 40, and transmits the translated instructions to the isolated power modules (20, 21, 22...2N);

F. Isolated power modules (20, 21, 22...2N) receive instructions from the control module 30 and charge or discharge the batteries (10, 11, 12...1N), and the information generated by the operation is translated by the control module 30 Feedback to computer 40 afterward.

In this embodiment, the step B is specifically:

B1. The isolated power supply module 201 converts the mains power into a low-voltage direct current and completes electrical isolation, and provides electric energy to the operation control module 205 and the power control module 202;

B2, the operation control module 205 receives the request message from the control module through the isolation communication module 206, and transmits the request message to the power control module 202;

B3. The power control module 202 receives the request message from the operation control module 205, and collects the voltage, current and temperature information of each battery (10, 11, 12...1N) in the battery pack according to the content of the request message;

B4, the sampling module 204 detects the acquisition status of the power control module 202, and feeds back the detected information to the operation control module 205 through the response message;

B5. The operation control module 205 feeds back the response message to the control module 30 through the isolation communication module 206 .

In the present embodiment, in the step F, the specific steps for charging the battery are:

F1. The power control module 202 receives instructions from the operation control module 205, charges the batteries (10, 11, 12...1N) according to the instructions, and outputs part or all of the energy of the commercial power to the batteries (10, 11, 12...1N);

F2. The sampling module 204 detects the charging state of the power control module 202 and feeds back the detected information to the operation control module 205;

F3. The operation control module 205 compares and judges according to the feedback information and the user's demand information, and adjusts the charging speed of the battery by the power control module 202 in real time.

In this embodiment, in the step F, the specific steps for discharging the battery are:

Fi. The power control module 202 receives the instruction of the operation control module 205, discharges the battery (10, 11, 12...1N), and outputs part or all of the energy of the battery (10, 11, 12...1N) to the energy consumption module 203;

Fii. The sampling module 204 detects the discharge state of the power control module 202 and feeds back the detected information to the operation control module 205;

FⅢ. The operation control module 205 compares and judges according to the feedback information and the user's demand information, and adjusts the discharge speed of the battery (10, 11, 12...1N) by the power control module 202 in real time.

The above-mentioned embodiments are preferred implementation solutions of the present invention. In addition, the present invention can also be realized in other ways, and any obvious replacements are within the protection scope of the present invention without departing from the concept of the present invention.

Claims (6)

1. a diagnostic method for batteries of electric automobile off-board diagnosis equipment, is characterized in that: described batteries of electric automobile off-board diagnosis equipment comprises some isolated power modules and a control module be connected with outer computer; Isolated power module is for gathering the voltage of each battery in power brick, electric current and temperature information, input control module; Control module is for receiving the information of isolated power module acquires and processing, and be electrical isolation between described some isolated power modules, described isolated power module is connected by communication bus with between described control module;

Described isolated power module comprises insulating power supply module, power control module, sampling module, operation control module and isolated communication module; Insulating power supply module is used for converting civil power to low-voltage DC and completing electrical isolation, provides electric energy to operation control module and power control module; Power control module for gathering voltage, electric current and the temperature information of each battery in power brick or carrying out charge or discharge operation to battery, sampling module be used for detection power control module operating state and by detect information feed back to operate control module; Operation control module, by communication bus described in isolated communication model calling, receives the information from described control module, and the job information feeding back himself is to control module;

The diagnostic method of above-mentioned batteries of electric automobile off-board diagnosis equipment comprises the steps:

A, control module send request message to isolated power module;

B, isolated power module receive from the request message of control module, and according to the voltage of each battery in the content acquisition power brick of request message, electric current and temperature information, the information of collection are fed back to control module by response message;

C, control module receive the response message from isolated power module, the response message of reception is saved in external memory storage and translates, and the response message after translation is transferred to computer;

D, computer obtain the demand information of user by man-machine interface, according to the demand information of user, diagnosed, the instruction after diagnosis is sent to control module by the main body diagnosis maintenance algorithm of computer to the response message received;

E, control module receive the instruction from computer and translate, by the command after translation to isolated power module;

F, isolated power module receive the instruction from control module and carry out charge or discharge operation to battery, and the information that operation produces feeds back to computer after control module translation;

Wherein, in described step F, to the concrete steps of battery charging be:

F1, power control module receive the instruction from operation control module, carry out charging operations according to instruction to battery, and part or all of the energy of civil power is outputted to battery;

The charged state of F2, sampling module detection power control module by the information feed back detected to operating control module;

F3, operation control module compare judgement according to the demand information of feedack and user, and real-time Modulating Power control module is to the charging rate of battery.

2. the diagnostic method of a kind of batteries of electric automobile off-board diagnosis equipment according to claim 1, is characterized in that: each described battery connects one or more isolated power module; Described battery is the lithium-ion-power cell that voltage is less than 5V.

3. the diagnostic method of a kind of batteries of electric automobile off-board diagnosis equipment according to claim 1, is characterized in that: described control module comprises external memory storage.

4. the diagnostic method of a kind of batteries of electric automobile off-board diagnosis equipment according to claim 1, is characterized in that: described isolated power module also comprises energy ezpenditure module, and energy ezpenditure module is connected with described power control module.

5. the diagnostic method of a kind of batteries of electric automobile off-board diagnosis equipment according to claim 1, is characterized in that: described step B is specially:

B1, insulating power supply module convert civil power to low-voltage DC and complete electrical isolation, provide electric energy to operation control module and power control module;

B2, operation control module receive the request message from control module by isolated communication module, and request message is transferred to power control module;

B3, power control module receive the request message from operation control module, and according to the voltage of each battery in the content acquisition power brick of request message, electric current and temperature information;

The acquisition state of B4, sampling module detection power control module, feeds back to operation control module by the information of detection by response message;

Response message is fed back to control module by isolated communication module by B5, operation control module.

6. the diagnostic method of a kind of batteries of electric automobile off-board diagnosis equipment according to claim 4, is characterized in that: in described step F, to the concrete steps of battery discharge is:

F I, power control module receive the instruction of operation control module, carry out discharge operation to battery, and part or all of the energy of battery is outputted to energy ezpenditure module;

The discharge condition of F II, sampling module detection power control module by the information feed back detected to operating control module;

F III, operation control module compare judgement according to the demand information of feedack and user, and real-time Modulating Power control module is to the velocity of discharge of battery.