CN111693782A - Storage battery internal resistance test and large current tolerance test device with loop resistor - Google Patents
Storage battery internal resistance test and large current tolerance test device with loop resistor Download PDFInfo
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- CN111693782A CN111693782A CN202010590588.6A CN202010590588A CN111693782A CN 111693782 A CN111693782 A CN 111693782A CN 202010590588 A CN202010590588 A CN 202010590588A CN 111693782 A CN111693782 A CN 111693782A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/386—Arrangements for measuring battery or accumulator variables using test-loads
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Abstract
The invention discloses a storage battery internal resistance test and large current tolerance test device with loop resistance, which comprises: the data acquisition module is used for acquiring charging voltage and current, external path resistance, load current and battery voltage; the double-load module is used for controlling the output current; the system control module comprises an MCU module and a logic control module; the photoelectric isolation module is used for connecting the data acquisition module and the double-load module with the system control module in an isolated manner; the data acquisition module and the double-load module are connected with the logic control module through the photoelectric isolation module, the logic control module is connected with the MCU module, and the output end of the double-load module is connected with the battery pack to be tested. The invention can accurately measure the loop resistance, improve the control precision and stability of the output current of the testing device and reduce the volume and manufacturing cost of the device.
Description
Technical Field
The invention relates to the technical field of storage battery testing, in particular to a storage battery internal resistance testing and large current tolerance testing device with loop resistance.
Background
The storage battery is widely used as a backup power supply in various industries such as telecommunications, power systems, banks and the like, the reliability and the use performance of the storage battery are critical to the power systems, the internal resistance of the storage battery is an important index for reflecting the performance of the storage battery, and the accurate measurement and calibration of the internal resistance of the storage battery become a common concern in the industry and are also important parameters for constant value management in the power industry.
The technical standard published at home and abroad, for example, the standard test method for measuring the internal resistance of the storage battery by a secondary discharge method is specified in GB/T19638.2-2005 fixed valve-controlled valve-regulated sealed lead-acid storage battery and IEC60896 fixed valve-controlled valve-regulated sealed lead-acid storage battery, and the test steps comprise 20 seconds and 4I10And 5 seconds 20I10(I10For discharge current at 10-hour discharge rate of the battery, e.g. 300Ah nominal battery, I1030A) for rapid ultra-large current amplification. For a large storage battery with a capacity of 3000Ah, 20I10The maximum value of the voltage is 6000A, and the realization of the rapid, accurate and stable control of the super-large current is difficult to realize by a secondary discharge method.
At present, the storage battery internal resistance testing device widely used in the market measures internal resistance by a rough manual control simulation secondary method or a low current method, does not meet the technical requirements of a secondary discharge method, does not form a standard, and cannot be used for calibrating batteries. Therefore, a testing device which is convenient to use, intelligent and capable of realizing the secondary discharge method in the national standard is still lacking in the internal resistance testing aspect of the valve-regulated lead-acid storage battery at home and abroad at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the storage battery internal resistance test and large current tolerance test device with the loop resistance, which can realize the accurate, automatic and rapid measurement of the internal resistance and large current tolerance test of the valve-regulated sealed lead-acid storage battery, has stable measurement result and high repeatability, and meets the requirements of GB _ T _19638.2-2005 and IEC60869-2 on the test of relevant parameters of the valve-regulated storage battery.
The technical scheme adopted by the invention is as follows:
take battery internal resistance test and heavy current of loop resistance to endure testing arrangement includes:
the data acquisition module is used for acquiring charging voltage and current, external path resistance, load current and battery voltage;
the double-load module is used for controlling the output current;
the system control module comprises an MCU module and a logic control module;
the photoelectric isolation module is used for connecting the data acquisition module and the double-load module with the system control module in an isolated manner;
the data acquisition module and the double-load module are connected with the logic control module through the photoelectric isolation module, the logic control module is connected with the MCU module, and the output end of the double-load module is connected with the battery pack to be tested.
The further technical scheme of the invention is as follows: the data acquisition module comprises a charging current acquisition module, an external path resistance prediction module, a load current acquisition module and a battery voltage acquisition module, wherein the charging voltage current acquisition module comprises a single battery voltage detector connected on a single battery in parallel and battery voltage detectors connected on two sides of the battery pack to be detected in parallel.
The further technical scheme of the invention is as follows: the double-load module comprises a first load current control module and a second load current control module, and the first load current control module and the second load current control module are connected in parallel; the first load current control module comprises a first load controller, n groups of step-by-step on/off controllers, 2n-1A load resistance circuit, wherein n is more than or equal to 1; the load resistance circuit comprises a load resistor and a relay which are connected in series; the first load controller is connected with n groups of step-by-step on/off controllers, and the n groups of step-by-step on/off controllers are connected with 2n-1The relay control end of the load resistance circuit is connected; 2 is describedn-1The load resistance circuits are connected in parallel; the second load current control module comprises a second load controller, m groups of step-by-step on/off controllers, and 2m-1A load resistance circuit, wherein m is more than or equal to 1, the second load controller is connected with m groups of step-by-step on/off controllers, and the m groups of step-by-step on/off controllers are connected with 2m-1And the relay control end of the load resistance circuit is connected.
The further technical scheme of the invention is as follows: the external path resistance prediction module comprises a prediction resistor, a current detector, a prediction switch, a voltage detector and a shunt group, the prediction resistor, the current detector and the prediction switch are connected in series and then connected in parallel with the double-load module, and the current detector is connected in series inside a shunt of the shunt group; the voltage detector is arranged on the outer path resistance prediction module in parallel, and the output end of the shunt group is an anode wiring position.
The further technical scheme of the invention is as follows: the shunt group comprises a first shunt, a second shunt and a third shunt, wherein the first shunt is connected with a first current detector in series, the second shunt is connected with a second current detector in series, and the third shunt is connected with a third current detector in series.
Furthermore, the detection ranges of the first current detector, the second current detector and the third current detector are 0-1200A, 500-: within 300AH, 300AH-800AH, 800-3000 AH.
The further technical scheme of the invention is as follows: further comprising: the communication control module is used for communicating the MCU module with the upper computer; the MCU module is connected with the communication control module through the photoelectric isolation module.
The further technical scheme of the invention is as follows: further comprising: the voltage-limiting constant-current charging module is used for performing charging control on the battery pack to be tested; and the voltage-limiting constant-current charging module is connected in parallel at two ends of the battery to be tested.
Furthermore, the voltage-limiting constant-current charging module comprises a voltage converter, a charging switch, a charging current divider and a charging current detector, wherein the output end of the voltage converter is sequentially connected with the charging switch and the charging current divider, and the charging current divider is connected with the charging current detector in parallel.
The invention has the beneficial effects that:
1. the invention is composed of a duobinary coding resistor and a load controller which are connected in parallel, the discharge current of the storage battery is controlled by controlling the resistance values of two binary coding resistors, the loop resistance can be accurately measured, and 20-second 4I is realized by the precise control of the dynamic load105 seconds 20I10And a smooth discharge of 30I10Resistant big electricityFlow testing;
2. on one hand, the load controller improves the dynamic response speed of the testing device through loop resistance prediction and feedforward load control; the control precision and the stability of the output current of the testing device are improved.
3. The combination of the low-current relays is utilized to complete high-current control, and the relays which are quickly and sequentially closed/disconnected one by one prevent the relays from being adhered due to hysteresis current generated when the super-large current is disconnected, so that the function of the high-current relays is achieved, and the size and the manufacturing cost of the device are greatly reduced.
Drawings
FIG. 1 is a structural diagram of a device for testing the internal resistance of a storage battery with a loop resistor and testing the high-current tolerance, which is provided by the invention;
FIG. 2 is a schematic circuit diagram of a testing apparatus according to the present invention;
FIG. 3 is a discharge characteristic curve diagram of a secondary discharge internal resistance measurement method according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a first load current control module according to the present invention;
FIG. 5 is a timing diagram of the control current for a rapid sequential one-by-one relay closing according to the present invention
FIG. 6 is a schematic diagram of the control current for rapidly sequentially closing the relays one by one in accordance with the present invention;
FIG. 7 is a timing diagram of a rapid sequential one-by-one switching off of relay control currents in accordance with the teachings of the present invention;
fig. 8 is a schematic diagram of the control current of the relay which is switched off one by one in a rapid sequence according to the invention.
Detailed Description
The technical scheme provided by the invention has the following general idea:
the invention designs a device capable of measuring internal resistance by a secondary discharge method, which consists of a duobinary coded resistor and a load controller which are connected in parallel, and the internal resistance value of the valve-controlled lead-acid storage battery is estimated by controlling the resistance values of two binary coded resistors to control the discharge current of the valve-controlled lead-acid storage battery. On one hand, the load controller improves the dynamic response speed of the testing device through loop resistance prediction and feedforward load control; on the other hand, the control precision and the stability of the output current of the testing device are improved through current feedback control. Experimental results show that the static and dynamic output response of the designed internal resistance testing device of the valve-controlled lead-acid storage battery completely meets the requirements of relevant domestic and foreign testing standards, and the internal resistance detection of the storage battery can be effectively realized.
The invention designs a device capable of measuring internal resistance by a secondary discharge method in GB/T19638.2 fixed valve-controlled sealed lead-acid battery and IEC60896 fixed valve-controlled sealed lead-acid battery standards. The design of the invention also completes the 3-minute 30I specified in GB/T19638.2-2005 fixed valve-controlled sealed lead-acid battery and IEC60896 fixed valve-controlled sealed lead-acid battery10And (5) carrying out a high-current resistance test.
Referring to fig. 1 and fig. 2, wherein fig. 1 is a structural diagram of a device for testing internal resistance of a storage battery with a loop resistor and testing high-current tolerance according to the present invention; FIG. 2 is a schematic circuit diagram of a testing apparatus according to the present invention;
as shown in fig. 1 and fig. 2, the apparatus for testing internal resistance and large current tolerance of a battery with a loop resistor according to the present invention includes:
the data acquisition module is used for acquiring charging voltage and current, external path resistance, load current and battery voltage;
the double-load module is used for controlling the output current;
the system control module comprises an MCU module and a logic control module;
the photoelectric isolation module is used for connecting the data acquisition module and the double-load module with the system control module in an isolated manner;
the data acquisition module and the double-load module are connected with the logic control module through the photoelectric isolation module, the logic control module is connected with the MCU module, and the output end of the double-load module is connected with the battery pack to be tested.
The device comprises an MCU module in charge of a center, a communication control module communicated with an upper computer, a charge-discharge current acquisition module (V5, mV4) after photoelectric isolation of a large-scale control chip, an external path (a tested battery and a connecting cable) resistance prediction module (A, V5), a load current acquisition module (mV1/mV2/mV3) and a single battery voltage acquisition module (V1, V2 and V3); the parallel double-LOAD module is controlled by the transition relay sets 1 and 2, the LOAD1 and the LOAD 2; the data acquisition module comprises an A/D converter and a voltage and current detector group, and is connected with the system control module through the photoelectric isolation module.
In the embodiment of the invention, the principle of the secondary discharge internal resistance measurement method is as follows:
1) first, a discharge characteristic curve U ═ f (i) is designed, see fig. 3, where (U) is shown1,I1) For charging the accumulator with current I1＝4I10～6I10Terminal voltage and current values after 20 seconds of discharge; (U)2,I2) For charging the accumulator with current I2＝20I10Terminal voltage and current value after 5S of discharge;
2) calculating the internal resistance of the storage battery according to the following formula:
Ri＝(V1-V2)/(I2-I1)；
the capacity of the fixed valve-regulated sealed lead-acid battery is 20 AH-3000 AH, and the second current 20I of internal resistance is measured by the standard secondary discharge method10The device is provided with an external path resistance prediction circuit and a double parallel loop current control load, and the current control load is designed by 40A-6000A and the time length is only 5S, so that the rapid dynamic response speed, high precision and stable current control of the testing device are realized.
In the embodiment of the invention, the data acquisition module comprises a charging current acquisition module, an external path resistance prediction module, a load current acquisition module and a battery voltage acquisition module, wherein the charging voltage current acquisition module comprises a single battery voltage detector connected in parallel on a single battery and battery voltage detectors connected in parallel on two sides of a battery pack to be tested.
The device simultaneously collects the discharge current and the voltages of all the single batteries after primary discharge and secondary discharge, and ensures that the current value and the voltage value are at the same time point. And ensuring the conformity of the calculated internal resistance Ri (V1-V2)/(I2-I1) to the internal resistance measured by a secondary discharge method in the GB/T19638.2 fixed valve-controlled sealed lead-acid battery and IEC60896 fixed valve-controlled sealed lead-acid battery standards.
The double-load module comprises a first load current control module and a second load current control module, and the first load current control module and the second load current control module are connected in parallel; the first load current control module comprises a first load controller, n groups of step-by-step on/off controllers, 2n-1A load resistance circuit, wherein n is more than or equal to 1; the load resistance circuit comprises a load resistor and a relay which are connected in series; the first load controller is connected with n groups of step-by-step on/off controllers, and the n groups of step-by-step on/off controllers are connected with 2n-1The relay control end of the load resistance circuit is connected; 2n-1The load resistance circuits are connected in parallel; the second load current control module comprises a second load controller, m groups of step-by-step on/off controllers, 2m-1A load resistance circuit, wherein m is greater than or equal to 1, the second load controller is connected with m groups of step-by-step on/off controllers, and the m groups of step-by-step on/off controllers are connected with 2m-1And the relay control end of the load resistance circuit is connected.
The first load current control module of the device is composed of load resistors which can generate iA, 2iA, 4iA and … … 2n-1iA currents and can be freely controlled in parallel in n paths, and the second load module is composed of load resistors which can generate iA, 2iA, 4iA and … … 2m-1iA currents and can be freely controlled in parallel in m paths. Each step discharge LOAD resistance RK (K is 1,2,3, … … m, n) of the first LOAD current control module LOAD1 and the second LOAD current control module LOAD2 is composed of 2K-1 resistors r and a control relay, the relay is composed of K-1 step LOAD modules which are rapidly and sequentially turned on/off one by one as shown in fig. 4 and fig. 5, a small current relay (one application example is equal to or less than 70A) is used for combining to complete large current control of 2K-1iA, and the K-1 relays which are rapidly and sequentially turned on/off one by one prevent the relay from being stuck due to hysteresis current generated by di/dt when a super large current (one application example is equal to or more than 9000A) is turned off, so that the function of the large current relay is achieved, and the volume and the manufacturing cost of the device are reduced.
In the embodiment of the invention, the external path resistance prediction module comprises a prediction resistor, a current detector, a prediction switch, a voltage detector and a shunt group, wherein the prediction resistor, the current detector and the prediction switch are connected in series and then are connected in parallel with the dual-load module, and the current detector is connected in series inside a shunt of the shunt group; the voltage detector is arranged on the outer path resistance prediction module in parallel, and the output end of the shunt group is an anode wiring position.
The shunt group can be provided with a plurality of groups as required, and the preferred shunts are provided with three groups, namely the shunt group comprises a first shunt, a second shunt and a third shunt, wherein the first shunt is connected with a first current detector in series, the second shunt is connected with a second current detector in series, and the third shunt is connected with a third current detector in series.
The current detection modules are connected with the SHUNT SHUNT1, the SHUNT SHUNT2 and the SHUNT SHUNT3 in series in a circuit of the battery pack to be detected, cross over detection points of the SHUNT and are connected with the system control module, and the current detection modules are mV1, mV2 and mV3 and are used for detecting currents in different current ranges and improving detection accuracy. Preferably, the device of the present invention covers batteries of all capacities, 20I10The discharge current is 40A-6000A, 30I10The discharge current is 60A-9000A, in order to improve the measurement accuracy, three-stage discharge current detection is adopted, three SHUNTs SHUNT1, SHUNT2 and SHUNT3 are used for carrying out graded detection, the three SHUNTs SHUNT1, SHUNT2 and SHUNT3 respectively correspond to 0-1200A, 500-10000A and 2000-10000A, and are correspondingly connected with tested battery packs in different capacity ranges: within 300AH, 300AH-800AH, 800-3000 AH.
In order to realize the communication of system control module and host computer, still include: the communication control module is used for communicating the MCU module with the upper computer; the MCU module is connected with the communication control module through the photoelectric isolation module. The system control module uploads the data to an upper computer through the communication control module and the RS485 and can be used for setting a preset instruction or drawing a current-voltage characteristic curve graph.
Another embodiment of the present invention is that the apparatus further comprises: the voltage-limiting constant-current charging module is used for performing charging control on the battery pack to be tested; the voltage-limiting constant-current charging module is connected in parallel at two ends of the battery to be tested. The voltage-limiting constant-current charging module can be used for repeatedly testing after full charge, and more accurate results can be obtained through multiple measurements.
The voltage-limiting constant-current charging module comprises a voltage converter, a charging switch, a charging current divider and a charging current detector, wherein the output end of the voltage converter is sequentially connected with the charging switch and the charging current divider, and the charging current detector is connected to the charging current divider in parallel. The device is provided with a charging device, can charge the battery to be tested, and keeps the requirement of measuring the internal resistance on the charge capacity of the battery by a secondary discharge method in the standard.
The embodiment of the invention provides the internal resistance level of the fixed valve-regulated sealed lead-acid storage battery and 30I required by the internal resistance level test of the fixed valve-regulated sealed lead-acid storage battery, which completely meet the IEC60896-2 and GB/T19638.2-2005 standards10The high-current resistance testing device realizes internal resistance testing of the lead-acid storage battery and realizes 4I in 20 seconds in the testing process105 seconds 20I10And 3 minutes 30I10The discharge speed reaches a specified large-current discharge value quickly and smoothly, especially for a large-capacity battery with the discharge speed of 100-3000 ampere hours. Using 20 sec 4I10And 5 seconds 20I10And calculating the internal resistance value of each battery according to the voltage difference and the current difference measured by the two-time discharging. 3 minutes 30I10And constant current discharge is used for detecting the large current tolerance of the storage battery.
The current control module of the device consists of two LOAD current control modules LOAD1 and LOAD2, wherein the first LOAD current control module regulates the LOAD resistance to be about 90-95% of the required discharge current value according to the predicted loop resistance value and the battery pack voltage, the first LOAD current control module LOADs once without dynamic adjustment, and the second LOAD current control module dynamically finely adjusts the discharge current to realize 20 s 4I105 seconds 20I10And 3 minutes 30I10The method has the advantages that the short-circuit current and the internal resistance of the fixed valve-controlled sealed lead-acid storage battery can be accurately, automatically and quickly measured due to stable discharge, the measurement result is stable, and the accuracy is high;
a first load current control module including generating iA, 2iA, 4iA, … … 2n-1The n paths of the iA current can be formed by load resistors controlled in parallel, and one embodiment example comprises the following steps: sequentially generate 0.5A, 1A, 2A、……216-116 paths of 0.5A (16384A) current can freely control the parallel load resistance; a second load current control module including generating iA, 2iA, 4iA, … … 2m-1The m paths of the iA current can be formed by load resistors controlled in parallel, and one embodiment example comprises the following steps: in turn, 0.5A, 1A, 2A, … … 214-1And 14 paths of 0.5A (4096A) current can freely control the parallel load resistance.
The current ampere multiple generated is only a preferred embodiment, and the invention does not exclude that other parallel load resistors with the resistance value being multiple multiples or the difference value of adjacent resistors being less than or equal to one time of smaller resistance value form a specific load resistor of the current control module;
fig. 4-8 are schematic diagrams of embodiments of each load current control step of the apparatus of the present invention. Each step of discharging LOAD resistor R of the first current control module LOAD1 and the second current control module LOAD2K(K is 1,2,3, … … m, n) is 2K-1A resistor r and a control relay, wherein the relay is composed of k-1 step load modules which are rapidly turned on/off one by one in sequence and are shown in figures 6 and 8, and 2 steps are combined and completed by using low-current relays (one application example is less than or equal to 70A)k-1The high-current control of iA, k-1 relays which are closed/disconnected one by one in a rapid sequence prevent the relay from being adhered due to hysteresis current generated by di/dt when a super-large current (one application example is equal to or larger than 9000A) is disconnected, so that the function of the high-current relay is achieved, and the device volume and the manufacturing cost are reduced.
The system control module consisting of the MUC, the large-scale logic control chip and the photoelectric isolation can receive preset instructions sent to the system control module by the control computer through the RS485 interface and can also operate according to the set instructions. The system control module composed of MUC, large-scale logic control chip and photoelectric isolation controls the first current control module to be 2I10-40I10(A) The current is discharged instantly, the voltage, the connection resistance and the current of a battery monomer/module are measured by a battery detection module, and the impedance of each part is calculated, so that the impedance of the whole discharge loop is predicted and evaluated; the system control module then controls the first current controlThe system module adjusts the load to be about 90% -95% of the required discharge current value according to the predicted loop resistance value and the battery pack voltage, the load is loaded once without dynamic adjustment, the second current control module performs dynamic fine adjustment on the discharge current, and 20-second 4I is achieved10(first Point (U)1,I1)， U1、I1Voltage and current values of the nth cell at the end of 20 seconds of discharge) and 20I for 5 seconds10(second Point (U)2,I2)，U2、I2Voltage and current values of the nth cell at the end of 20 seconds discharge) was measured using a two-point voltage (U)1,U2) And the current value is calculated to obtain the internal resistance (R)in). The following were obtained:
Rin＝(U1-U2)/(I2-I1)(Ω)；
if the test needs to be repeated, the voltage-limiting constant-current charging module is used for charging the battery to be tested between BAT + and BAT-, and the test is repeated after the battery is fully charged.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.
Claims (9)
1. Take circuit resistance's battery internal resistance test and heavy current to endure testing arrangement, its characterized in that includes:
the data acquisition module is used for acquiring charging voltage and current, external path resistance, load current and battery voltage;
the double-load module is used for controlling the output current;
the system control module comprises an MCU module and a logic control module;
the photoelectric isolation module is used for connecting the data acquisition module and the double-load module with the system control module in an isolated manner;
the data acquisition module and the double-load module are connected with the logic control module through the photoelectric isolation module, the logic control module is connected with the MCU module, and the output end of the double-load module is connected with the battery pack to be tested.
2. The apparatus for testing internal resistance and large current tolerance of storage battery with loop resistor according to claim 1, wherein the data collection module comprises a charging current collection module, an external path resistance prediction module, a load current collection module and a battery voltage collection module, and the charging voltage current collection module comprises a single battery voltage detector connected in parallel to a single battery and battery voltage detectors connected in parallel to two sides of the battery pack to be tested.
3. The device for testing the internal resistance and the large-current tolerance of the storage battery with the loop resistance according to claim 1, wherein the double-load module comprises a first load current control module and a second load current control module, and the first load current control module and the second load current control module are connected in parallel; the first load current control module comprises a first load controller, n groups of step-by-step on/off controllers, 2n-1A load resistance circuit, wherein n is more than or equal to 1; the load resistance circuit comprises a load resistor and a relay which are connected in series; the first load controller is connected with n groups of step-by-step on/off controllers, and the n groups of step-by-step on/off controllers are connected with 2n-1The relay control end of the load resistance circuit is connected; 2 is describedn-1The load resistance circuits are connected in parallel; the second load current control module comprises a second load controllerController, m-group step-by-step on/off controller, 2m-1A load resistance circuit, wherein m is more than or equal to 1, the second load controller is connected with m groups of step-by-step on/off controllers, and the m groups of step-by-step on/off controllers are connected with 2m-1And the relay control end of the load resistance circuit is connected.
4. The device for testing the internal resistance of the storage battery with the loop resistance and the large-current tolerance of the storage battery with the loop resistance as claimed in claim 1, wherein the external path resistance prediction module comprises a prediction resistance, a current detector, a prediction switch, a voltage detector and a shunt group, the prediction resistance, the current detector and the prediction switch are connected in series and then connected in parallel with the dual-load module, and the current detector is connected in series inside a shunt of the shunt group; the voltage detector is arranged on the outer path resistance prediction module in parallel, and the output end of the shunt group is an anode wiring position.
5. The apparatus for testing internal resistance and high current endurance of battery with loop resistance according to claim 1, wherein the set of current dividers comprises a first current divider, a second current divider and a third current divider, wherein the first current divider is connected in series with the first current detector, the second current divider is connected in series with the second current detector, and the third current divider is connected in series with the third current detector.
6. The apparatus for testing the internal resistance and the large current tolerance of the battery with the loop resistor as claimed in claim 5, wherein the detection ranges of the first current detector, the second current detector and the third current detector are 0-1200A, 500-2500A and 2000-10000A, and the apparatus is correspondingly connected to the battery packs to be tested with different capacity ranges: within 300AH, 300AH-800AH, 800-3000 AH.
7. The apparatus for testing the internal resistance of a battery and testing the high-current withstand voltage according to claim 1, further comprising: the communication control module is used for communicating the MCU module with the upper computer; the MCU module is connected with the communication control module through the photoelectric isolation module.
8. The apparatus for testing the internal resistance of a battery and testing the high-current withstand voltage according to claim 1, further comprising: the voltage-limiting constant-current charging module is used for performing charging control on the battery pack to be tested; and the voltage-limiting constant-current charging module is connected in parallel at two ends of the battery to be tested.
9. The device for testing the internal resistance and the large current tolerance of the storage battery with the loop resistor as claimed in claim 8, wherein the voltage-limiting constant-current charging module comprises a voltage converter, a charging switch, a charging shunt and a charging current detector, wherein the output end of the voltage converter is sequentially connected with the charging switch and the charging shunt, and the charging current detector is connected in parallel with the charging shunt.
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| CN115420196A (en) * | 2022-08-30 | 2022-12-02 | 天津大学 | Universal three-dimensional object measuring method and device |
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