CN102478631B - Battery performance parameter measuring device and measuring method thereof - Google Patents

Abstract

A battery performance parameter measurement device includes a terminal device, a bidirectional inverter, a power module, a data acquisition module and an energy storage device, the terminal device is connected to the bidirectional inverter, and the terminal device is also connected to the device to be tested through the data acquisition module The battery is connected, and the battery to be tested is respectively connected to the power module and the energy storage device through a bidirectional inverter. It overcomes the existing battery performance parameter measurement. In the multiple charging and discharging process, it is necessary to manually connect the battery to be tested with the charging device when charging, and to manually connect the battery to be tested to the discharge load when discharging, and The disadvantage of wasting energy in the discharge process of the battery under test. The battery performance parameter measuring device of the present invention greatly saves manual operations, and the discharge energy of the battery to be tested can also be recovered to the energy storage device, saving energy.

Description

Battery performance parameter measuring device and measuring method thereof

technical field

The invention relates to the field of battery detection, in particular to a battery performance parameter measurement device and a measurement method thereof.

Background technique

With the increasing shortage of non-renewable energy, energy issues have attracted more and more attention, and green new energy products will become an inevitable trend of social development. As a new energy vehicle, electric vehicles are gradually developing. As we all know, the main energy source of electric vehicles is the on-board battery. At present, since the entire battery pack (battery system) is composed of a certain number of battery packs, each battery pack is composed of a certain number of single cells. However, there are certain differences between each group of battery packs and individual batteries, and the characteristics are not completely consistent. Therefore, before using the entire battery packaged vehicle, it must be tested for comprehensive performance parameters (mainly including capacity, voltage, internal resistance, charge and discharge at different temperatures and different currents), and the corresponding relationship between these parameters can be summarized. To complete the matching with the corresponding battery manager. Among them, in order to measure the performance parameters of the battery, it is necessary to use currents of different rates to continuously carry out the process of [charging→discharging→charging] for the battery pack, and the cycle is repeated. At present, the experimental process and method of a charge-discharge cycle are: (1) Manually connect the battery pack to the charging device and charge it to a fully charged state; (2) Transfer both ends of the battery pack from the charging device to the discharge load (light box or resistor ), to discharge the battery pack in the form of load heat.

There are two disadvantages in the process of this experimental method: (1) When charging, it is necessary to manually connect the battery pack to the charging device, and after charging, it is necessary to manually remove the terminal of the battery from the charging device and transfer it to the charging device. discharge load. There are many manual processes, which is a waste of time; (2) The energy of the battery pack is consumed in vain in the form of heat dissipation during the charging and discharging experiment, which is not fully utilized.

Contents of the invention

In order to solve the technical problem that the existing battery performance parameter measurement experiment needs to manually repeat the charging and discharging process, and the energy is wasted during the discharge in the existing measurement experiment, it provides a battery that does not require manual cumbersome operations and the discharged energy can be fed back to A battery performance parameter measuring device for an energy storage device.

In order to solve the above technical problems, the present invention provides a battery performance parameter measurement device, including terminal equipment, bidirectional inverter, power module, data acquisition module and energy storage equipment, the terminal equipment is connected with the bidirectional inverter, the The terminal device is also connected to the battery to be tested through the data acquisition module, and the battery to be tested is connected to the power module and the energy storage device respectively through the bidirectional inverter.

The present invention also provides a battery performance parameter measurement method. The battery performance parameter measurement device includes a terminal device, a bidirectional inverter, a power module, a data acquisition module, and an energy storage device. The terminal device is connected to the bidirectional inverter. The terminal device is also connected to the battery to be tested through the data acquisition module, and the battery to be tested is connected to the power module and the energy storage device respectively through a bidirectional inverter, wherein the measurement method includes the following steps:

Step 1: The terminal device receives a charge command or a discharge command, and when it is a charge command, execute step 2, and when it is a discharge command, execute step 5;

Step 2: Control the power supply module to charge the battery under test through the bidirectional inverter, and control the data acquisition module to collect the performance parameters of the battery under test in real time during the charging process, and store the performance parameters in the terminal device. The performance parameters Including temperature, voltage and current;

Step 3: When the collected voltage of the battery to be tested reaches the high voltage protection value of the battery to be tested, perform step 4, otherwise continue to perform step 2;

Step 4: The terminal device controls the power module to stop charging the battery under test through the bidirectional inverter, and returns to step 1;

Step 5: Control the battery to be tested to discharge through the bidirectional inverter, feed back the electric energy to the energy storage device, and control the data acquisition module to collect the performance parameters of the battery under test in real time during the discharge process, and store the performance parameters to the terminal device In, the performance parameters include temperature, voltage and current;

Step 6: When the collected voltage of the battery to be tested reaches the low voltage protection value of the battery to be tested, perform step 7, otherwise continue to perform step 5;

Step 7: The terminal device controls the battery under test to stop discharging through the bidirectional inverter, and returns to step 1.

It can be seen from the technical solution provided by the present invention that the present invention includes a terminal device, a bidirectional inverter, a power module, a data acquisition module and an energy storage device, the terminal device is connected to the bidirectional inverter, and the terminal device also The data acquisition module is connected to the battery to be tested, and the battery to be tested is respectively connected to the power module and the energy storage device through a bidirectional inverter, so that the battery performance parameter measurement device of the present invention can greatly save manual operations, and the battery to be tested The discharged energy is also recovered to the energy storage device, which saves energy, thereby avoiding the cumbersome manual operation caused by the existing battery performance parameter measurement, and the disadvantages of wasting energy in the discharge process.

Description of drawings

FIG. 1 is a structural block diagram of Embodiment 1 of a device for measuring battery performance parameters of the present invention.

FIG. 2 is a flow chart of Embodiment 1 of the method for measuring battery performance parameters provided by the present invention.

FIG. 3 is a flow chart of Embodiment 2 of the method for measuring battery performance parameters provided by the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In order to solve the existing battery performance parameter measurement experiment, when the battery to be tested is charging, it is necessary to manually connect the battery to be tested with the charging device, and when the battery to be tested is discharging, it is necessary to manually connect the battery to be tested to the discharge load. Repeating charging and discharging several times will inevitably bring a lot of cumbersome operations to people, and the existing technical problem of wasting energy in the discharge process of battery performance parameter measurement. The present invention provides a battery performance parameter measurement device. The device includes a terminal equipment, a bidirectional inverter, a power module, a data acquisition module, and an energy storage device, the terminal equipment is connected to the bidirectional inverter, the terminal equipment is also connected to the battery to be tested through the data acquisition module, and the battery to be tested is connected to the The bidirectional inverter is connected to the power module and the energy storage device respectively. The battery performance parameter measuring device of the present invention can greatly save manual operations, and the energy of the battery to be tested can also be recovered to the energy storage device during the discharge process, thereby avoiding waste of energy.

In order to enable those skilled in the art to better understand and realize the present invention, specific examples are described below.

Fig. 1 is a structural block diagram of Embodiment 1 of the battery performance parameter measuring device of the present invention. Referring to Fig. 1, the battery performance parameter measuring device includes a terminal device 1, a bidirectional inverter 4, a power module 5, a data acquisition module 2 and an energy storage device 6 , the terminal device 1 is connected to the bidirectional inverter 4, the terminal device 1 is also connected to the battery 3 to be tested through the data acquisition module 2, and the battery 3 to be tested is connected to the power module 5 and the battery to be tested respectively through the bidirectional inverter 4 The energy storage device 6 is connected.

In a specific implementation, the terminal device 1 may be a computer, but not limited to a computer, and the terminal device 1 includes a general-purpose computer input and output device with communication processing and control functions.

In a specific implementation, the data acquisition module 2 includes a temperature collector for collecting the temperature of the battery 3 to be tested and a power meter for collecting the voltage and current of the battery 3 to be tested. Of course, it can also be other devices for collecting For the temperature, voltage and current of the battery 3 to be tested, for example, a temperature sensor can be used to collect the temperature of the battery 3 to be tested, a voltmeter can be used to collect the voltage of the battery 3 to be tested, and so on.

In a specific implementation, the power supply module 5 can be a solar energy storage device, of course, it can also be other energy modules capable of supplying power to the battery 3 to be tested.

In a specific implementation, the energy storage device 6 may be a power grid, of course, it may also be other devices capable of storing electric energy.

The present invention is further improved on the basis of the above-mentioned embodiment (including the first embodiment of the battery performance parameter measurement device and the embodiment extended on the basis of it), adding a constant temperature device, and the battery 3 to be tested is placed in the constant temperature in the device. In this way, the battery to be tested 3 can be placed in a constant temperature device to measure its performance parameters. The temperature of the above constant temperature device can be arbitrarily set according to the needs of the experimenter, so that the performance parameters of the battery to be tested 3 at different temperatures can be obtained (to be tested). The performance parameters of the battery under test 3 are different at different temperatures), so we can make the experiment of measuring the performance parameters of the battery 3 under test more accurate and comprehensive, thus avoiding the measurement of the existing battery performance parameters, which is only limited to Measuring the performance parameters of the battery 3 under test at normal temperature or at room temperature is the disadvantage of inaccurate measurement.

Fig. 2 is a flow chart of Embodiment 1 of the method for measuring battery performance parameters provided by the present invention. Referring to Fig. 2, the method for measuring battery performance parameters includes the following steps:

Step 21: The terminal device 1 receives a charge command or a discharge command, and when it is a charge command, execute step 22, and when it is a discharge command, execute step 25;

In specific implementation, due to the difference in the state of charge (SOC for short, which refers to the ratio of the remaining capacity of the battery to its fully charged total capacity) of the battery 3 to be tested, that is, the battery may be fully charged (that is, fully charged), or it may be fully charged. The remaining capacity of the battery is 0. For these two different situations, you can choose to send corresponding commands to the terminal device 1, that is, when the battery under test 3 is fully charged, send a discharge command to the terminal device 1, and when the battery under test 3 When the remaining capacity of is 0, a charging command is sent to the terminal device 1.

In addition, what needs to be explained here is that in order to accurately measure the performance parameters of the battery, the present invention can charge and discharge the same battery 3 to be tested multiple times, so it is necessary to send multiple charge and discharge commands to the terminal device 1, wherein the charge and discharge The number of times can be determined by the experimenter according to the requirements of the experiment and the workload of the experiment.

Step 22: Control the power supply module 5 to charge the battery under test 3 through the bidirectional inverter 4, and control the data acquisition module 2 to collect the performance parameters of the battery under test 3 in the charging process in real time, and store the performance parameters in the terminal device 1 In, the performance parameters include temperature, voltage and current;

Step 23: When the collected voltage of the battery under test 3 reaches the high voltage protection value of the battery under test 3, execute step 24, otherwise continue to execute step 22;

Step 24: The terminal device 1 controls the power module 5 to stop charging the battery under test 3 through the bidirectional inverter 4, and returns to step 21;

Step 25: Control the battery under test 3 to discharge through the bidirectional inverter 4, feed back the electric energy to the energy storage device 6, and control the data acquisition module 2 to collect the performance parameters of the battery under test 3 in the discharge process in real time, and report the performance Parameters are stored in the terminal device 1, the performance parameters include temperature, voltage and current;

Step 26: When the collected voltage of the battery under test 3 reaches the low voltage protection value of the battery under test 3, execute step 27, otherwise continue to execute step 25;

Step 27: The terminal device 1 controls the battery under test 3 to stop discharging through the bidirectional inverter 4, and returns to step 21.

In specific implementation, the temperature protection value refers to the temperature protection value of the battery. When the temperature of the battery exceeds this temperature protection value, the battery will be damaged; the high voltage protection value refers to the voltage protection value when the battery is charging. When the voltage protection value is lower than the voltage protection value, the battery will be damaged due to charging explosion; the low voltage protection value refers to the voltage protection value when the battery is discharged. When the voltage exceeds this voltage protection value, the battery will be damaged.

In a specific implementation, the performance parameters may include capacity, internal resistance, etc. in addition to temperature, voltage and current. Since the definition of performance parameters is a technical term known to those skilled in the art, it will not be described in detail here. describe.

As can be seen from this embodiment, when the terminal device 1 receives the charging command, the control power supply module 5 charges the battery under test 3 through the bidirectional inverter 4, and controls the data acquisition module 2 to collect the charging process of the battery under test 3 in real time. The performance parameter in, and this performance parameter is stored in the terminal device 1, and described performance parameter comprises temperature, voltage and electric current; 1 Control the power supply module 5 to stop charging the battery under test 3 through the bidirectional inverter 4; and when the terminal device 1 receives a discharge command, control the battery under test 3 to discharge through the bidirectional inverter 4, and feed back the electric energy to the energy storage device 6, and control the data acquisition module 2 to collect in real time the performance parameters of the battery to be tested 3 in the discharge process, and store the performance parameters in the terminal device 1, the performance parameters include temperature, voltage and current, when the battery to be tested is collected When the voltage of the battery under test 3 reaches the low-voltage protection value of the battery under test 3, the terminal device 1 controls the battery under test 3 to stop discharging through the bidirectional inverter 4, so that the battery under test 3 is in the process of charging and discharging, its position and the The device does not need to be replaced again, thereby avoiding manual cumbersome operations. Moreover, the energy discharged by the battery 3 to be tested is fed back to the energy storage device 6 through the bidirectional inverter 4, thereby making good use of energy and avoiding energy waste.

Fig. 3 is a flow chart of Embodiment 2 of the method for measuring battery performance parameters provided by the present invention. Referring to Fig. 3, the method of this embodiment includes the following steps:

Step 31: The terminal device 1 receives a charge command or a discharge command, and when it is a charge command, execute step 32, and when it is a discharge command, execute step 37;

Step 32: Control the power supply module 5 to charge the battery under test 3 through the bidirectional inverter 4, and control the data acquisition module 2 to collect the performance parameters of the battery under test 3 in the charging process in real time, and store the performance parameters in the terminal device 1 In, the performance parameters include temperature, voltage and current;

Step 33: When the collected temperature exceeds the first preset value or the collected voltage exceeds the second preset value, execute step 34, otherwise continue to execute step 32;

Step 34: the terminal device 1 controls the power supply module 5 to gradually reduce the current for charging the battery under test 3 through the bidirectional inverter 4;

Step 35: When the collected voltage of the battery under test 3 reaches the high voltage protection value of the battery under test 3, execute step 36, otherwise continue to execute step 34;

Step 36: The terminal device 1 controls the power module 5 to stop charging the battery under test 3 through the bidirectional inverter 4, and returns to step 31;

Step 37: Control the battery under test 3 to discharge through the bidirectional inverter 4, feed back the electric energy to the energy storage device 6, and control the data acquisition module 2 to collect the performance parameters of the battery under test 3 in the discharge process in real time, and report the performance Parameters are stored in the terminal device 1, the performance parameters include temperature, voltage and current;

Step 38: When the collected temperature of the battery under test 3 exceeds the first preset value or the collected voltage of the battery under test 3 exceeds the third preset value, execute step 39, otherwise continue to execute step 37;

Step 39: the terminal device 1 controls the discharge current of the battery under test 3 through the bidirectional inverter 4 to gradually decrease;

Step 40: When the collected voltage of the battery under test 3 reaches the low voltage protection value of the battery under test 3, execute step 41, otherwise continue to execute step 39;

Step 41: The terminal device 1 controls the battery under test 3 to stop discharging through the bidirectional inverter 4, and returns to step 31.

In this embodiment, the first preset value is preferably 75% to 85% of the temperature protection value of the battery 3 to be tested, and the second preset value is preferably 90% to 95% of the high voltage protection value of the battery 3 to be tested, The third preset value is 110%-120% of the low voltage protection value of the battery 3 under test.

This embodiment is mostly the same as the first embodiment of the method for measuring battery performance parameters, the difference is that: during the charging process of the battery 3 to be tested, when the temperature of the battery 3 to be tested is collected exceeding the first preset value or the temperature of the battery to be tested is collected When the voltage of 3 exceeds the second preset value, the terminal device 1 controls the power supply module 5 to gradually reduce the current to charge the battery 3 under test through the bidirectional inverter 4; during the discharge process of the battery 3 under test, when the When the temperature of the battery 3 exceeds the first preset value or the collected voltage of the battery 3 under test exceeds the third preset value, the terminal device 1 controls the discharge current of the battery 3 under test to gradually decrease through the bidirectional inverter 4 . The purpose of this is to avoid the disadvantage that the battery under test 3 has a large impact on the battery under test 3 due to excessive current when it is close to being fully charged and fully discharged, so this embodiment can better extend the battery life under test. 3 service life.

As a further preferred solution of the present invention, a further improvement can be made on the basis of the first embodiment of the battery performance parameter measurement method and the second embodiment of the battery performance parameter measurement method, that is, in the charging process of the battery 3 to be tested, a step is added, when collecting When the voltage of the battery under test 3 reaches the temperature protection value of the battery under test 3, the terminal device 1 controls the power module 5 to stop charging the battery under test 3 through the bidirectional inverter 4, and ends the process; during the discharge process of the battery under test 3 In the process, a step is also added. When the collected voltage of the battery 3 under test reaches the temperature protection value of the battery 3 under test, the terminal device 1 controls the battery 3 under test to stop discharging through the bidirectional inverter 4, and ends the process. The purpose of this preferred solution is that when the battery under test 3 is abnormal, the terminal device 1 can actively stop the charging and discharging of the battery under test 3, and end the measurement of the battery under test 3, so as to avoid abnormal battery temperature surge and failure. What needs to be explained here is that when the battery under test 3 does not have the above-mentioned situation during charging or discharging (such as the voltage of the battery under test 3 reaching the temperature protection value of the battery under test 3), this preferred solution is still in accordance with this Preferred Solution The first embodiment of the method for measuring battery performance parameters before improvement and the second embodiment of the method for measuring battery performance parameters are implemented.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (4)

1. a battery performance parameter measurement mechanism, it is characterized in that, comprise terminal device, two-way inverter, power module, data acquisition module and energy storage device, described terminal device is connected with two-way inverter, described terminal device is also connected with mesuring battary by data acquisition module, described mesuring battary is connected with energy storage device with power module respectively by two-way inverter, described mesuring battary is placed in thermostatic equipment, described data acquisition module comprises Temperature sampler for gathering mesuring battary temperature and the kilowatt meter for the voltage and current that gathers mesuring battary.

2. a battery performance parameter measuring method, battery performance parameter measurement mechanism comprises terminal device, two-way inverter, power module, data acquisition module and energy storage device, described terminal device is connected with two-way inverter, described terminal device is also connected with mesuring battary by data acquisition module, described mesuring battary is connected with energy storage device with power module respectively by two-way inverter, described mesuring battary is placed in thermostatic equipment, described data acquisition module comprise Temperature sampler for gathering mesuring battary temperature and for the voltage and current that gathers mesuring battary kilowatt meter wherein, measuring method comprises the following steps:

Step one: terminal device receives charge command or electric discharge order, when for charge command, performs step 2, when for electric discharge order, then performs step 5;

Step 2: control power module and charged to mesuring battary by two-way inverter, and the performance parameter of control data acquisition module Real-time Collection mesuring battary in charging process, and this performance parameter is stored in terminal device, described performance parameter comprises temperature, voltage and current, and, when the temperature collecting mesuring battary more than the first preset value or collect mesuring battary voltage more than the second preset value time, the electric current that terminal device control power module is charged to mesuring battary by two-way inverter reduces gradually, described first preset value is 75% ~ 85% of mesuring battary temperature protection value, described second preset value is 90% ~ 95% of mesuring battary high voltage protective value,

Step 3: when the voltage collecting mesuring battary reaches the high voltage protective value of mesuring battary, performs step 4, otherwise continues to perform step 2;

Step 4: terminal device controls power module to be stopped being charged to mesuring battary by two-way inverter, returns and performs step one;

Step 5: control mesuring battary and discharged by two-way inverter, by this electric energy feedback to energy storage device, and the performance parameter of control data acquisition module Real-time Collection mesuring battary in discharge process, and this performance parameter is stored in terminal device, described performance parameter comprises temperature, voltage and current;

Step 6: when the voltage collecting mesuring battary reaches the low-voltage variation value of mesuring battary, performs step 7, otherwise continues to perform step 5;

Step 7: terminal device controls mesuring battary to be stopped being discharged by two-way inverter, returns and performs step one.

3. battery performance parameter measuring method according to claim 2, it is characterized in that, comprise further after step 5, when the temperature collecting mesuring battary more than the first preset value or collect mesuring battary voltage more than the 3rd preset value time, terminal device controls the electric current that electric mesuring battary discharged by two-way inverter and reduces gradually.

4. battery performance parameter measuring method according to claim 3, is characterized in that, described 3rd preset value is 110% ~ 120% of mesuring battary low-voltage variation value.

5battery performance parameter measuring method according to claim 4; characterized by further comprising; at mesuring battary in charging process; when the voltage collecting mesuring battary reaches the voltage protection value of mesuring battary; terminal device controls power module to be stopped being charged to mesuring battary by two-way inverter; and process ends; and/or in mesuring battary discharge process; when the voltage collecting mesuring battary reaches the voltage protection value of mesuring battary; terminal device controls mesuring battary to be stopped being discharged by two-way inverter, and process ends.

6battery performance parameter measuring method according to claim 4, it is characterized in that, described data acquisition module comprises Temperature sampler and kilowatt meter, described Temperature sampler is for gathering the temperature of mesuring battary in charge or discharge process, and described kilowatt meter is for gathering the voltage and current of mesuring battary in charge or discharge process.