CN113189530B - Metering calibration device of battery cell charging and discharging test equipment - Google Patents
Metering calibration device of battery cell charging and discharging test equipment Download PDFInfo
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- CN113189530B CN113189530B CN202110485363.9A CN202110485363A CN113189530B CN 113189530 B CN113189530 B CN 113189530B CN 202110485363 A CN202110485363 A CN 202110485363A CN 113189530 B CN113189530 B CN 113189530B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
Abstract
The utility model relates to a measurement calibrating device of electricity core charge-discharge test equipment belongs to measurement calibration field, can avoid the electric core short circuit risk among the operation process, improves the security among the measurement calibration process. A metering calibration device of a battery cell charging and discharging test device comprises: a mode selection circuit for selecting a metrology calibration mode; first, second, third and fourth pathways; a power supply module; and the control circuit is used for respectively controlling the first passage to be connected to discharge by the power supply module to execute discharge current full-range metering calibration, controlling the second passage to be connected to discharge by the power supply module to execute discharge voltage full-range metering calibration, controlling the third passage to be connected to execute charge current full-range metering calibration and controlling the fourth passage to be connected to execute charge voltage full-range metering calibration when the discharge current, discharge voltage, charge current and charge voltage full-range metering calibration modes are selected.
Description
Technical Field
The utility model relates to a measurement calibration field specifically relates to a measurement calibrating device of electricity core charge-discharge test equipment.
Background
In the research and development process of the power battery core, the battery core charging and discharging test equipment is required to be used for carrying out charging and discharging operations on the power battery core so as to test the performance of the power battery core. In order to meet the accuracy of the battery cell charging and discharging test equipment, the battery cell charging and discharging test equipment needs to be measured and calibrated regularly.
Currently, a commonly used metering calibration method is to connect a group of battery cells to a charge-discharge loop of a battery cell charge-discharge test device, and calibrate a full-range current (e.g., 0-400A) and a full-range voltage (e.g., 0-5V) of the battery cell charge-discharge test device. In the measurement and calibration process, the current range of the battery cell charge and discharge test equipment to be measured and calibrated exceeds the standard charge current of the battery cell, so that the battery cell is in an overshoot state and an over-discharge state, and safety accidents such as explosion and the like are easy to occur. In addition, before each measurement and calibration, a shunt, a high-precision multimeter, a high-precision cement resistor, a voltage source, a battery cell and battery cell charge and discharge test equipment to be measured and calibrated need to be connected in series and in parallel in a complex manner, so that the operation is complicated, and connection errors are easy to occur. Moreover, when the metering calibration mode is switched every time (for example, the mode is switched from the discharge current full-range metering calibration mode to the discharge voltage full-range metering calibration mode), the channel lines at the two ends of the battery cell need to be detached and reinstalled, so that the short-circuit potential safety hazard exists.
Disclosure of Invention
The utility model aims at providing a measurement calibrating device of electricity core charge and discharge test equipment can guarantee the security among the measurement calibration process, improves measurement calibration's accuracy and work efficiency.
According to a first embodiment of the present disclosure, a metering calibration device of a battery cell charging and discharging test device is provided, which includes: the mode selection circuit is used for selecting a metering calibration mode, and the metering calibration mode comprises a discharge current full-range metering calibration mode, a discharge voltage full-range metering calibration mode, a charge current full-range metering calibration mode and a charge voltage full-range metering calibration mode; a first path, a second path, a third path, and a fourth path; the power supply module meets the current-voltage discharge capacity requirement required by the metering calibration of the battery cell charging and discharging test equipment; a control circuit for controlling the first path to be turned on to perform discharge current full-scale metering calibration of the cell charge and discharge test apparatus by being discharged by the power supply module when the discharge current full-scale metering calibration mode is selected, when the discharge voltage full-scale metering calibration mode is selected, controlling the second path to be switched on to be discharged by the power supply module to execute discharge voltage full-scale metering calibration of the cell charge and discharge test equipment, when the charging current full-range metering calibration mode is selected, controlling the third circuit to be connected to execute the charging current full-range metering calibration of the battery core charging and discharging test equipment, and when the charging voltage full-range metering calibration mode is selected, controlling the fourth path to be connected to execute the charging voltage full-range metering calibration of the battery cell charging and discharging test equipment.
Optionally, the first path comprises a contactor, a first main relay, a first intermediate relay, a shunt, and a first voltage measuring instrument, wherein: one end of the main contactor is connected with the power supply module, and the other end of the main contactor is connected with the live wire and the zero line; one end of a series path formed by the first main relay and the shunt in series is connected to the positive pole of the power supply module, and the other end of the series path is connected to a positive pole interface terminal of the metering calibration device; the first intermediate relay is connected with the first voltage measuring instrument in series and then connected with the shunt in parallel; the negative pole of the power module is connected to the negative interface terminal of the metering calibration device.
Optionally, the second path includes a discharge resistor, a second voltage measuring instrument, the contactor, a second intermediate relay, and a third intermediate relay, wherein: one end of a series path formed by the discharge resistor and the second intermediate relay in series is connected with the anode of the power supply module, and the other end of the series path is connected with the anode interface terminal; one end of a series path formed by connecting the second voltage measuring instrument and the third intermediate relay in series is connected with the positive electrode interface terminal, and the other end of the series path is connected with the negative electrode interface terminal.
Optionally, the third circuit comprises a third main relay, the shunt, the first intermediate relay and the first voltage meter, wherein: one end of a series path formed by the third main relay and the shunt in series is connected with the positive electrode interface terminal, and the other end of the series path is connected with the negative electrode interface terminal.
Optionally, the fourth circuit includes the second voltage measuring instrument, a charging resistor, a second main relay, the third intermediate relay, and a fourth intermediate relay, wherein: one end of a series path formed by connecting the charging resistor and the fourth intermediate relay in series is connected with the positive electrode interface terminal, and the other end of the series path is connected with the negative electrode interface terminal; one end of a series path formed by connecting the second voltage measuring instrument and the third intermediate relay in series is connected with the positive electrode interface terminal, and the other end of the series path is connected with the negative electrode interface terminal; one end of the second main relay is connected with the positive electrode interface terminal, and the other end of the second main relay is connected with the negative electrode interface terminal.
Optionally, the metering calibration device further includes an alarm circuit, and the control circuit is further configured to control the alarm circuit to alarm when at least two metering calibration modes are simultaneously selected.
Optionally, the control circuit is a single chip microcomputer or a field programmable gate array circuit.
Optionally, the first voltage measuring instrument and the second voltage measuring instrument are one of a high-precision millivoltmeter, a high-precision multimeter and a high-precision internal resistance instrument.
Optionally, the mode selection circuit is a mode selection button or a mode selection knob.
Optionally, in a path through which a discharging current or a charging current flows, the discharging current or the charging current is transmitted by the copper guide bars.
The technical scheme according to the application has the following beneficial effects:
(1) in the metering calibration process, the high-power supply module is used as a current source and a voltage source to replace a battery cell used in the prior art for discharging, so that the battery cell does not need to be accessed in the metering calibration process, the battery cell short circuit risk and the problems of overcharge and over discharge of the battery cell in the metering calibration process are avoided, the safety in the metering calibration process is improved, and safety accidents such as battery cell explosion are avoided.
(2) Before the measurement and calibration, a current divider, a high-precision universal meter, a high-precision cement resistor, a voltage source, a battery cell and battery cell charge and discharge test equipment to be measured and calibrated do not need to be connected in series or in parallel in a complex manner like the prior art, so that the operation is simple, and the connection error is not easy to occur. Moreover, when the metering and calibrating modes are switched every time, the channel lines at the two ends of the battery cell do not need to be disassembled and reinstalled like the prior art, so that the potential safety hazard of short circuit is avoided.
(3) The automatic switching and connection of the components required in each step of the metering calibration process are realized, the connection is firm and reliable, the positive and negative electrode current lines and the voltage lines of the battery cell charging and discharging test equipment to be metered and calibrated are connected to the positive and negative interface terminals of the metering calibration device according to the application, and the corresponding metering calibration mode is selected through the mode selection circuit, so that the access of all metering calibration components can be completed. Therefore, the phenomenon of loose connection and poor contact does not exist, and the precision and the accuracy of the metering calibration are improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a schematic block diagram of a metering calibration apparatus of a battery cell charging and discharging test device according to an embodiment of the present disclosure.
FIG. 2 is a schematic circuit diagram of a metrology calibration device according to one embodiment of the present disclosure.
FIG. 3 is a schematic design diagram of a metrology calibration device according to an embodiment of the present disclosure.
FIG. 4 is a schematic diagram of yet another design of a metrology calibration device according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a schematic block diagram of a metering calibration device of a battery cell charging and discharging test apparatus according to an embodiment of the present disclosure. As shown in fig. 1, the metering calibration apparatus 100 includes a mode selection circuit 10, a first path 20, a second path 30, a third path 40, a fourth path 50, a power supply module 60, and a control circuit 70.
The mode selection circuit 10 is used for selecting a metering calibration mode, and the metering calibration mode comprises a discharging current full-range metering calibration mode, a discharging voltage full-range metering calibration mode, a charging current full-range metering calibration mode and a charging voltage full-range metering calibration mode. The four modes can respectively complete discharge current full-range metering calibration, discharge voltage full-range metering calibration, charge current full-range metering calibration and charge voltage full-range metering calibration of the cell charge and discharge test equipment.
And the power supply module 60, wherein the power supply module 60 meets the current and voltage discharge capacity requirement required by the measurement and calibration of the cell charge and discharge test equipment 200. That is, the power module 60 is a high-power module, and can be used as a current source and a voltage source to replace a battery cell used in the prior art for discharging.
A control circuit 70 for controlling the first path 20 to be turned on to perform the full-scale metering calibration of the discharge current of the cell charge and discharge test apparatus 200 by discharging from the power module 60 when the full-scale metering calibration mode of the discharge current is selected, controlling the second path 30 to be turned on to perform the full-scale metering calibration of the discharge voltage of the cell charge and discharge test apparatus 200 by discharging from the power module 60 when the full-scale metering calibration mode of the discharge voltage is selected, controlling the third path 40 to be turned on to perform the full-scale metering calibration of the charge current of the cell charge and discharge test apparatus 200 when the full-scale metering calibration mode of the charge current is selected, and controlling the fourth path 50 to be turned on to perform the full-scale metering calibration of the charge voltage of the cell charge and discharge test apparatus 200 when the full-scale metering calibration mode of the charge voltage is selected.
The technical scheme according to the application has the following beneficial effects:
(1) in the metering calibration process, the high-power supply module 60 is used as a current source and a voltage source to replace a battery cell used in the prior art for discharging, so that the battery cell does not need to be accessed in the metering calibration process, the battery cell short circuit risk and the problems of overcharging and overdischarging of the battery cell in the metering calibration process are avoided, the safety in the metering calibration process is improved, and the safety accidents such as battery cell explosion and the like are avoided.
(2) Before the measurement and calibration, a shunt, a high-precision multimeter, a high-precision cement resistor, a voltage source, a battery cell and a battery cell charge and discharge test device to be measured and calibrated do not need to be connected in series or in parallel in a complex manner like the prior art, so that the operation is simple and connection errors are not easy to occur. Moreover, when the metering and calibrating modes are switched every time, the channel lines at the two ends of the battery cell do not need to be disassembled and re-installed like the prior art, so that the potential safety hazard of short circuit is avoided.
(3) The automatic switching and connection of the components required in each step of the metering calibration process are realized, the connection is firm and reliable, the positive and negative electrode current lines and the voltage lines of the battery cell charging and discharging test equipment to be metered and calibrated are connected to the positive and negative interface terminals of the metering calibration device according to the application, and the corresponding metering calibration mode is selected through the mode selection circuit, so that the access of all metering calibration components can be completed. Therefore, the phenomenon of loose connection and poor contact does not exist, and the precision and the accuracy of the metering calibration are improved.
FIG. 2 is a schematic circuit diagram of a metrology calibration device according to one embodiment of the present disclosure. As shown in fig. 2, the first path 20 includes a contactor KM1, a first main relay 1, a first intermediate relay KA1, a shunt 4, and a first voltage measuring instrument 5. One end of the main contactor KM1 is connected with the power supply module 60, and the other end is connected with the live wire and the zero wire. One end of a series path formed by the first main relay 1 and the shunt 4 connected in series is connected to the positive electrode of the power module 60, and the other end of the series path is connected to a positive electrode interface terminal of the metering calibration device 100, and when the metering calibration is performed, the positive electrode of the current line or the positive electrode of the voltage line of the cell charging and discharging test equipment 200 is connected to the positive electrode interface terminal of the metering calibration device 100. The first intermediate relay KA1 and the first voltage measuring instrument 5 are connected in series and then connected in parallel with the shunt 4. The negative electrode of the power module 60 is connected to a negative electrode interface terminal of the metering calibration device 100, and when the metering calibration is performed, the negative electrode of the current line or the negative electrode of the voltage line of the battery cell charging and discharging test equipment 200 is connected to the negative electrode interface terminal of the metering calibration device 100. In the present disclosure, the positive and negative interface terminals may be posts or otherwise.
When the mode selection circuit 10 selects the full-range measurement calibration mode of the discharge current, the control circuit 70 controls the contactor KM1, the main relay 1 and the intermediate relay KA1 to be closed, and controls other contactors, the main relay and the intermediate relay to be all switched off, so that the first path 20 is switched on, that is, a discharge current loop for performing measurement calibration on the full-range of the discharge current of the cell charge and discharge test equipment 200 is switched on, the contactor KM1 is connected to the commercial power through a zero line N and a live line L, the power supply module 60 provides the discharge current, the shunt 4 shunts a small part of the discharge current loop to a loop where the first voltage measuring instrument 5 is located, and the full-range measurement calibration of the discharge current of the cell charge and discharge test equipment 200 can be completed through the reading value of the first voltage measuring instrument 5.
With continued reference to FIG. 2, the second path 30 includes a discharge resistor R Put A second voltage measuring instrument 6, a contactor KM1, a second intermediate relay KA2 and a third intermediate relay KA 3. Discharge resistor R Put One end of a series path formed by the second intermediate relay KA2 in series is connected with the positive electrode of the power module 60, and the other end is connected with the positive electrode interface terminal; one end of a series path formed by the second voltage measuring instrument 6 and the third intermediate relay KA3 connected in series is connected to the positive electrode interface terminal, and the other end is connected to the negative electrode interface terminal. In the present disclosure, the discharge resistor R Put The cement resistor or other types of resistors can be made with high precision.
When the mode selection circuit 10 selects the discharge voltage full-range measurement calibration mode, the control circuit 70 controls the contactor KM1, the second intermediate relay KA2 and the third intermediate relay KA3 are closed, other contactors are controlled, the main relay and the intermediate relays are all disconnected, so that the second path 30 is connected, that is, the discharge voltage loop for measuring and calibrating the discharge voltage full-range of the battery cell charge-discharge test equipment 200 is connected, the contactor KM1 is connected to the commercial power through the zero line N and the live line L, the power module 60 provides the discharge voltage, and the discharge voltage full-range measurement calibration of the battery cell charge-discharge test equipment 200 can be completed through the reading value of the second voltage measuring instrument 6.
With continued reference to fig. 2, the third circuit 40 includes the third main relay 3, the shunt 4, the first intermediate relay KA1, and the first voltage measuring instrument 5. One end of a series path formed by connecting the third main relay 3 and the shunt 4 in series is connected to the positive electrode interface terminal, and the other end is connected to the negative electrode interface terminal.
When the mode selection circuit 10 selects the charging current full-range measurement calibration mode, the control circuit 70 controls the third main relay 3 and the first intermediate relay KA1 to be closed, controls other contactors, and switches off the main relay and the intermediate relay, so that the power module 60 is disconnected from the live wire L and the zero wire N, and thus electric energy cannot be obtained from the commercial power, and the second path 30 is connected, that is, the charging current loop for measuring and calibrating the charging current full-range of the battery cell charging and discharging test equipment 200 is connected, and the charging current full-range measurement calibration of the battery cell charging and discharging test equipment 200 can be completed through the reading value of the first voltage measuring instrument 5.
With continued reference to FIG. 2, the fourth path 50 includes the second voltage measuring instrument 6, the charging resistor R Charging device A second main relay 2, a third intermediate relay KA3 and a fourth intermediate relay KA 4. Charging resistor R Charging device One end of a series path formed by connecting the fourth intermediate relay KA4 in series is connected with the positive electrode interface terminal, and the other end of the series path is connected with the negative electrode interface terminal; one end of a series passage formed by connecting the second voltage measuring instrument 6 and the third intermediate relay KA3 in series is connected with the positive electrode interface terminal, and the other end of the series passage is connected with the negative electrode interface terminal; one end of the second main relay 2 is connected with the positive electrode interface terminal, and the other end is connected with the negative electrode interface terminal. In the present disclosure, the charging resistor R Charging device Cement resistors or other types of resistors can be used with high accuracy.
When the mode selection circuit 10 selects the charging voltage full-range measurement calibration mode, the control circuit 70 may control the second main relay 2, the third intermediate relay KA3 and the fourth intermediate relay KA4 to be closed, control other contactors, and turn off the main relay and the intermediate relays, so that the power module 60 is turned off from the live line L and the zero line N, and thus cannot obtain electric energy from the mains supply, and the fourth path 50 is turned on, that is, the charging voltage loop for measuring and calibrating the charging voltage full-range of the battery cell charging and discharging test equipment 200 is turned on, and the charging voltage full-range measurement calibration of the battery cell charging and discharging test equipment 200 can be completed by reading a value of the second voltage measuring instrument 6.
In some embodiments, the metrology calibration device 100 according to embodiments of the present disclosure further comprises an alarm circuit, wherein the control circuit 70 is further configured to control the alarm circuit to alarm when at least two metrology calibration modes are simultaneously selected. The alarm circuit may be in the form of an indicator light, beep, or the like. Therefore, the uniqueness of the metering calibration process can be realized through the interlocking in the program of the control circuit 70, if an operator selects two or more metering calibration modes at the same time, an alarm prompt can be given, the short circuit during the heavy current access is avoided, and the protection after the misoperation is realized.
In some embodiments, the control circuit 70 is a module having a control function, such as a single chip or a field programmable gate array circuit, so as to easily control the metering calibration process.
In some embodiments, the first voltage measuring instrument 5 and the second voltage measuring instrument 6 may be selected from instruments having a voltage measuring function, such as one of a high-precision millivoltmeter, a high-precision multimeter, and a high-precision internal resistance meter, to achieve voltage measurement.
In some embodiments, the mode selection circuit 10 may be a mode selection button or mode selection knob, thereby enabling easy metrology calibration mode selection.
In some embodiments, the discharging current or the charging current is transmitted by the copper guide bars in a path through which the discharging current or the charging current flows, wherein the copper guide bars are shown in bold solid lines in fig. 2. Because the current bearing capacity of the guide copper bar is large, safety accidents are avoided.
Fig. 3 and 4 each show a schematic design of a metrology calibration device according to an embodiment of the present disclosure, showing a schematic layout of the various components described above. Among other things, the 24V power supply shown in fig. 3 may be used to power the control circuit 70, various contactors, main relays, and intermediate relays, etc.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. To avoid unnecessary repetition, the disclosure does not separately describe various possible combinations.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (6)
1. The utility model provides a measurement calibrating device of electricity core charge and discharge test equipment which characterized in that includes:
the mode selection circuit is used for selecting a metering calibration mode, and the metering calibration mode comprises a discharge current full-range metering calibration mode, a discharge voltage full-range metering calibration mode, a charge current full-range metering calibration mode and a charge voltage full-range metering calibration mode;
a first path, a second path, a third path, and a fourth path;
the power supply module meets the current and voltage discharge capacity requirement required by metering and calibrating the battery cell charging and discharging test equipment;
a control circuit for controlling the first path to be turned on to perform discharge current full-scale metering calibration of the cell charge and discharge test apparatus by being discharged by the power supply module when the discharge current full-scale metering calibration mode is selected, when the discharge voltage full-scale metering calibration mode is selected, controlling the second path to be switched on to be discharged by the power supply module to execute discharge voltage full-scale metering calibration of the cell charge and discharge test equipment, when the charging current full-range metering calibration mode is selected, controlling the connection of the third path to execute the charging current full-range metering calibration of the battery cell charging and discharging test equipment, when the charging voltage full-range metering calibration mode is selected, controlling the fourth path to be connected to execute charging voltage full-range metering calibration of the battery cell charging and discharging test equipment;
wherein the first path comprises a contactor KM1, a first main relay (1), a first intermediate relay KA1, a shunt (4) and a first voltage measuring instrument (5), wherein:
one end of the contactor KM1 is connected with the power supply module, and the other end of the contactor KM1 is connected with a live wire and a zero wire;
one end of a series path formed by the first main relay (1) and the shunt (4) in series is connected to the positive pole of the power supply module, and the other end of the series path is connected to the positive pole interface terminal of the metering calibration device;
the first intermediate relay KA1 is connected in series with the first voltage measuring instrument (5) and then connected in parallel with the shunt (4);
the negative electrode of the power supply module is connected to a negative electrode interface terminal of the metering calibration device;
wherein the second path includes a discharge resistor R Put A second voltage measuring instrument (6), the contactor KM1, a second intermediate relay KA2 and a third intermediate relay KA3, wherein:
the discharge resistor R Put One end of a series path formed by the second intermediate relay KA2 in series is connected with the positive electrode of the power supply module, and the other end of the series path is connected with the positive electrode interface terminal;
one end of a series path formed by the second voltage measuring instrument (6) and the third intermediate relay KA3 in series is connected with the positive electrode interface terminal, and the other end of the series path is connected with the negative electrode interface terminal;
wherein the third circuit comprises a third main relay (3), the shunt (4), the first intermediate relay KA1 and the first voltage meter (5), wherein:
one end of a series path formed by connecting the third main relay (3) and the current divider (4) in series is connected with the positive electrode interface terminal, and the other end of the series path is connected with the negative electrode interface terminal;
wherein the fourth path comprises the second voltage measuring instrument (6) and a charging resistor R Charging device A second main relay (2), the third intermediate relay KA3 and a fourth intermediate relay KA4, wherein:
the charging resistor R Charging device One end of a series path formed by the fourth intermediate relay KA4 in series is connected with the positive electrode interface terminal, and the other end of the series path is connected with the negative electrode interface terminal;
one end of a series passage formed by the second voltage measuring instrument (6) and the third intermediate relay KA3 in series is connected with the positive electrode interface terminal, and the other end of the series passage is connected with the negative electrode interface terminal;
one end of the second main relay (2) is connected with the positive electrode interface terminal, and the other end of the second main relay is connected with the negative electrode interface terminal.
2. The metrological calibration device of claim 1, further comprising an alarm circuit,
the control circuit is also used for controlling the alarm circuit to give an alarm when at least two metering calibration modes are simultaneously selected.
3. The metrological calibration device of claim 1, wherein the control circuit is a single chip or a field programmable gate array circuit.
4. The metrological calibration device of claim 1, wherein the first voltage measuring instrument (5) and the second voltage measuring instrument (6) are one of a high precision millivoltmeter, a high precision multimeter, and a high precision internal resistance meter.
5. The metering calibration device of claim 1 wherein the mode selection circuit is a mode selection button or a mode selection knob.
6. The metering calibration device of claim 1, wherein the discharging current or the charging current is transmitted by the copper guide bars in a path through which the discharging current or the charging current flows.
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