CN116125315B - Detection device and detection method for line misconnection of battery charge and discharge test equipment - Google Patents
Detection device and detection method for line misconnection of battery charge and discharge test equipment Download PDFInfo
- Publication number
- CN116125315B CN116125315B CN202211538049.3A CN202211538049A CN116125315B CN 116125315 B CN116125315 B CN 116125315B CN 202211538049 A CN202211538049 A CN 202211538049A CN 116125315 B CN116125315 B CN 116125315B
- Authority
- CN
- China
- Prior art keywords
- positive
- sampling
- switch
- negative
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 183
- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 238000005070 sampling Methods 0.000 claims abstract description 219
- 230000005856 abnormality Effects 0.000 claims abstract description 23
- 230000002159 abnormal effect Effects 0.000 claims description 51
- 230000008859 change Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 238000012546 transfer Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 20
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- 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
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
-
- 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]
- G01R31/3644—Constructional arrangements
-
- 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
-
- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
The invention relates to a detection device and a detection method for line misconnection of battery charge-discharge test equipment, wherein the detection device comprises two transfer switches and a differential sampling circuit, the number of the transfer switches is two, the transfer switches comprises a positive transfer switch and a negative transfer switch, the output end of the positive transfer switch is connected with the battery sampling input positive end of the differential sampling circuit, the first input end is a positive sampling line connecting end, the second input end is a positive power line connecting end, the output end of the negative transfer switch is connected with the battery sampling input negative end of the differential sampling circuit, the first input end is a negative sampling line connecting end, the second input end is a negative power line connecting end, the switching states of the transfer switches are controlled by a control system of the battery equipment to realize a required detection mode, and wiring abnormality judgment is carried out according to the output of the differential sampling circuit in a relevant detection mode. On the basis of not adding excessive hardware facilities, the invention can judge all common 5 wiring anomalies by a relatively simple detection method.
Description
Technical Field
The invention relates to a detection device for the line misconnection of battery charge and discharge testing equipment and a detection method for the line misconnection of the battery charge and discharge testing equipment by adopting the detection device.
Background
Along with the proposal of the national 'double carbon' target, the new energy field is rapidly developed. The lithium battery has the advantages of high power density, long service life, high response speed, good safety performance and the like as an energy storage element, and is widely popularized and applied in the field of new energy. The large lithium battery manufacturers at home and abroad expand the productivity and increase the market share, and the blowout development is truly realized in recent years. The rapid development of lithium batteries drives the downstream industry, and battery charge and discharge testing equipment is used as necessary equipment for battery research, development, testing and production and manufacturing links, provides a great amount of precious testing data for battery manufacturers, and obtains a great amount of applications.
Lithium batteries are used as energy storage elements with high power density, are improperly disposed in the production, test, transportation and use processes, and have high safety risks such as fire and explosion, so that property loss and even casualties are caused. Therefore, the lithium battery charge and discharge test equipment must have sufficient risk inspection, alarm and protection capabilities, so that safety accidents can be effectively avoided.
In the charge and discharge test process of the lithium battery, voltage monitoring and threshold protection are often required to avoid overcharge and overdischarge. In order to eliminate the influence of line voltage drop generated during high-current charge and discharge, a kelvin four-wire detection wiring mode of a sampling line (a battery voltage sampling line or a battery sampling line) and a power line (a battery device power line or a device power line) is generally adopted. Because different battery devices need to be tested, a field operator often needs to manually wire the positive and negative power lines and the positive and negative sampling lines. The four test harnesses are at risk of misconnection due to the complexity of the production site and the potential for error by the site operator. If the risk of the misconnection is not considered, the battery and the testing equipment may be damaged, and even safety accidents may occur.
Although external characteristics such as thickness and color are usually distinguished on the test wire harness, the sampling wire generally adopts a thinner signal wire harness, the power wire is a thicker wire harness, and the industry general red, positive, black and negative principles are adopted, so that the misconnection risk is effectively avoided to a certain extent. However, there are still a few cases of misconnection, and common abnormal wiring includes the following types: (1) short-circuit and open-circuit of sampling lines; (2) the positive and negative of the sampling line are reversely connected; (3) short circuit and open circuit of the power line; (4) the positive and negative of the power line are reversely connected; (5) the power line and the sampling line are respectively connected to different battery packs.
Based on the existing detection means, different technical routes can be adopted to judge different wiring anomalies. For example, the short circuit and open circuit of the sampling line can be judged through the voltage value collected by the control system of the battery charge-discharge test equipment, and the positive and negative voltage collection can be carried out through adding a direct current bias on the sampling circuit under the condition of positive and negative reverse connection, and the sampling line does not operate when the sampling value does not reach or exceed the operating range of the equipment, and prompts faults, so that the field personnel can conveniently check the fault; the determination of the short circuit breaking and reverse connection of the power line is usually performed by connecting a diode and a resistor to the power circuit and utilizing the unidirectional conduction characteristic of the diode. The 5 th abnormal connection, that is, the power line and the sampling line are connected to different battery packs respectively, makes the judgment more complicated, and generally uses the mode of injecting voltage source to detect whether the positive power line and the positive sampling line, and the negative power line and the negative sampling line form a loop or not to judge.
At present, no detection device capable of judging various wiring anomalies and implementing corresponding protection measures exists, and the detection conception/detection method aiming at different wiring anomalies can only realize single or partial protection functions and has certain limitations. To realize the full-coverage protection of the various wiring anomalies on the same detection device, a hardware and software detection circuit and protection logic control for detecting other anomalies are added to the existing detection device capable of judging partial detection anomalies, which obviously increases the manufacturing cost and the development workload.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a detection device for the line misconnection of battery charge-discharge testing equipment and a detection method (or detection strategy) for the line misconnection of the battery charge-discharge testing equipment by adopting the detection device, so that the existing abnormal wiring is determined by a relatively simple detection method on the basis of not increasing excessive hardware facilities.
The technical scheme of the invention is as follows: the invention discloses a detection device for line misconnection of battery charge-discharge test equipment, which can implement any detection method disclosed by the invention and comprises a change-over switch and a differential sampling circuit, wherein the number of the change-over switches is two, the change-over switch comprises a positive change-over switch and a negative change-over switch, the output end (a public contact) of the positive change-over switch is connected with the battery sampling input positive end of the differential sampling circuit, the first input end (a first static contact) is a positive sampling line connecting end and is used for connecting a positive sampling line, the second input end (a second static contact) is a positive power line connecting end and is used for connecting a positive power line, the output end (the public contact) of the negative change-over switch is connected with the battery sampling input negative end of the differential sampling circuit, the first input end (the first static contact) is a negative sampling line connecting end and is used for connecting a negative sampling line, and the second input end (the second static contact) is a negative power line connecting end and is used for connecting a negative power line.
The differential sampling circuit may be provided with a differential amplifying circuit, and various forms of circuits/chips having the function of the differential amplifying circuit may be employed, for example, an operational amplifier serving as the differential amplifying circuit.
The non-inverting input terminal of the differential amplifying circuit is preferably connected with a positive voltage source for providing bias voltage.
Further, the output of the differential sampling circuit is connected to the control system, and the control system carries out wiring abnormality judgment according to the differential sampling result output by the differential sampling circuit in the corresponding detection mode. In general, when it is determined that the wiring is abnormal, the alarm and execution device of the battery device is controlled to perform a corresponding fault alarm without turning on the main power switch of the battery device, or, when the detection is completed or the final detection result is the case of the wiring abnormality, the main power switch of the battery device is not turned on, and when the final detection result is the case of the wiring abnormality, a corresponding alarm is performed according to the detection of the subsequent step performed according to the actual need/setting program.
The change-over switch preferably adopts a single-pole double-throw relay, and the control system controls the on-off state of each relay coil to control the on-off state of the change-over switch, so that a required detection mode is realized.
The invention discloses a detection method for the line misconnection of battery charge and discharge test equipment, which adopts any detection device disclosed by the invention to detect the abnormal wiring (misconnection) of the line of the battery charge and discharge test equipment, controls the switching state of each change-over switch to realize a required detection mode through a control system of the battery equipment, and judges the abnormal wiring according to the output (differential sampling result) of a differential sampling circuit in the relevant detection mode.
Further, the method comprises the following detection steps:
step S1: the control system controls each change-over switch to enter a switch state of a first detection mode, and judges that the sampling line wiring is abnormal according to a differential sampling result of a differential sampling circuit in the first detection mode, and judges that the sampling line wiring is normal (connection is correct) when the differential sampling result corresponds to a positive value of the battery voltage; when the differential sampling result corresponds to a negative value of the battery voltage, determining that the sampling line is connected reversely (positive and negative electrodes are connected reversely); when the differential sampling result corresponds to the 0 value of the battery voltage, judging that the wiring of the sampling line is abnormal (other abnormality except the negative and positive electrode connection is reversed), wherein the switch state of the first detection mode is that the positive sampling line is switched on by the positive switch Guan Jietong (in a state that the positive sampling line is switched on), and the negative sampling line is switched on by the negative switch (in a state that the negative sampling line is switched on);
step S2: the control system controls each change-over switch to enter a switch state of a second detection mode, and judges that the power line connection is abnormal according to a differential sampling result of a differential sampling circuit in the second detection mode, and when the differential sampling result corresponds to a positive value of the battery voltage, the power line connection is judged to be normal (connection is correct); when the differential sampling result corresponds to a negative value of the battery voltage, determining that the power line is connected reversely (positive and negative poles are connected reversely); when the differential sampling result corresponds to the value 0 of the battery voltage, it is determined that the power line is abnormal in connection (other abnormality except for the negative and positive electrode connection), and the switch condition of the detection mode two is positive power line (in a state where the positive power line should be turned on) of the positive switch Guan Jietong, and negative switch turns on negative power line (in a state where the negative power line should be turned on).
Further, if it is determined that the sampling line is connected reversely, a fault alarm of the sampling line connection is performed, and after the sampling line is manually rewired, step S1 is performed again until the determination result is not the sampling line connection reversely.
Further, if it is determined that the power line is connected reversely, a fault alarm is given to the power line connected reversely, and after the power line is manually rewired, step S2 is performed again until the determination result is not that the power line is connected reversely.
Further, in the case that the determination results (or called detection results) of the step S1 and the step S2 are both normal wiring (the wiring of the sampling line is normal, the wiring of the power line is normal), the step S3 is implemented, the control system controls each switch to enter the switch state of the detection mode three to obtain the differential sampling result in the detection mode three, controls each switch to enter the switch state of the detection mode four to obtain the differential sampling result in the detection mode four, and performs comprehensive wiring abnormality determination according to the differential sampling results in the detection mode three and the detection mode four, and determines that the detection mode three and the detection mode four are normal when the differential sampling results in the detection mode three and the detection mode four are positive values corresponding to the battery voltage; when the differential sampling results in the third detection mode and the fourth detection mode are both 0 values corresponding to the battery voltage, it is determined that the power line and the sampling line are not in the same loop, and such abnormal wiring is usually that the power line and the sampling line of different battery devices are connected to the corresponding input terminals of the detection device respectively.
Further, in the case that the determination result in the step S1 is that the connection is normal (the connection of the sampling line is normal) and the determination result in the step S2 is that the connection is abnormal (the connection of the power line is abnormal), implementing the step S3, controlling the switches to enter the switch state of the detection mode three by the control system to obtain the differential sampling result in the detection mode three, controlling the switches to enter the switch state of the detection mode four to obtain the differential sampling result in the detection mode four, performing the comprehensive connection abnormality determination according to the differential sampling results in the detection mode three and the detection mode four, and determining that the connection of the positive power line is abnormal (including the three cases of disconnection, unconnected and misconnection to the negative electrode of the battery) and the connection of the negative power line is normal when the differential sampling result in the detection mode three is a 0 value corresponding to the battery voltage and the differential sampling result in the detection mode four is a positive value corresponding to the battery voltage; when the differential sampling result in the third detection mode is a positive value corresponding to the battery voltage and the differential sampling result in the fourth detection mode is a 0 value corresponding to the battery voltage, determining that the positive power line is normally connected and the negative power line is abnormally connected (including three cases of disconnection, unconnected and misconnection to the positive electrode of the battery); when the differential sampling result in the detection mode three and the differential sampling result in the detection mode four are both 0 values corresponding to the battery voltage, it is determined that both the positive and negative power lines are abnormal in wiring (including both the case of disconnection and disconnection).
Further, in the case that the determination result in the step S1 is abnormal in connection (abnormal in connection of the sampling line) and the determination result in the step S2 is normal in connection (normal in connection of the power line), implementing the step S3, controlling the switches by the control system to enter the switch state of the detection mode three to obtain the differential sampling result in the detection mode three, controlling the switches to enter the switch state of the detection mode four to obtain the differential sampling result in the detection mode four, performing comprehensive connection abnormality determination according to the differential sampling results in the detection mode three and the detection mode four, and determining that the connection of the positive sampling line is abnormal (including the case of disconnection, unconnected and misconnection to the negative electrode of the battery) and the connection of the negative sampling line is normal when the differential sampling result in the detection mode three is positive value corresponding to the battery voltage and the differential sampling result in the detection mode four is 0 value corresponding to the battery voltage; when the differential sampling result in the third detection mode is 0 value corresponding to the battery voltage and the differential sampling result in the fourth detection mode is a positive value corresponding to the battery voltage, the positive sampling line is judged to be normal in wiring and the negative sampling line is judged to be abnormal in wiring (including three situations of disconnection, unconnected and misconnection to the positive electrode of the battery); when the differential sampling result in the detection mode three and the differential sampling result in the detection mode four are both 0 values corresponding to the battery voltage, it is determined that both the positive and negative sampling lines are abnormal in wiring (including both the case of disconnection and disconnection).
The third detection mode has a switching state of switching on the Guan Jietong positive power line (in a state where the positive power line should be turned on) and a negative switching state of switching on the negative sampling line (in a state where the negative sampling line should be turned on); the switch condition of the detection mode four is positive sampling line (in a state where the positive sampling line should be turned on) of positive switch Guan Jietong, and negative switch turns on negative power line (in a state where the negative power line should be turned on).
The beneficial effects of the invention are as follows: through setting up two change over switches of positive pole side and negative pole side, can realize four kinds of different detection modes through changing the state of change over switch under control system's control, according to the output of differential sampling circuit under relevant detection mode, can judge whether there is wiring unusual and the kind of wiring unusual. On the basis of the existing detection equipment, the invention does not need to add excessive facilities, has simple hardware constitution and simple and convenient data analysis, and has high validity and reliability of the judgment result, and can not generate false alarm or missing alarm phenomenon generally.
Drawings
FIG. 1 is a schematic diagram of a detection device according to the present invention;
FIG. 2 is a schematic diagram of a differential sampling circuit according to the present invention
FIG. 3 is a schematic diagram of a switch state (for example, normal wiring) of a detection mode one;
FIG. 4 is a schematic diagram of a wiring circuit for detecting abnormal wiring-positive and negative reversal of the sampling line in the test mode;
FIG. 5 is a schematic diagram of a wiring circuit for a detection mode in which the wiring is abnormal-the wire is open/unconnected as sampled;
FIG. 6 is a schematic diagram of a wiring circuit for a negative sample line open/unconnected state in a test mode;
FIG. 7 is a schematic diagram of wiring lines for the detection mode in which the wiring is abnormal-both positive and negative sampling lines are open/unconnected;
FIG. 8 is a schematic diagram of a wiring circuit in a detection mode in which both positive and negative sampling lines are connected to the positive electrode of the battery;
FIG. 9 is a schematic diagram of a wiring circuit for connecting positive and negative sampling lines to the negative electrode of a battery in a detection mode;
FIG. 10 is a schematic diagram of the switch state (for example, normal wiring) of the detection mode two;
FIG. 11 is a schematic diagram of a wiring circuit for detecting abnormal wiring-power line positive and negative reverse connection state in mode two;
FIG. 12 is a schematic diagram of a wiring circuit for detecting an abnormal wiring-positive power line unconnected (or open) condition in mode two;
FIG. 13 is a schematic diagram of a wiring circuit for detecting an abnormal wiring-negative power line unconnected (or open) condition in mode two;
FIG. 14 is a schematic diagram of a wiring circuit for detecting an abnormal wiring-positive and negative power lines unconnected (or broken) condition in mode two;
FIG. 15 is a schematic diagram of a wiring circuit for detecting abnormal wiring in mode two, where both positive and negative power lines are connected to the positive electrode of the battery;
FIG. 16 is a schematic diagram of a wiring circuit for detecting abnormal wiring in mode two, where both positive and negative power lines are connected to the negative electrode of the battery;
FIG. 17 is a schematic diagram of the wiring lines for detecting abnormal wiring in the third mode, in which positive and negative power lines are connected to different battery states, respectively;
fig. 18 is a schematic diagram of the state of the switch in the detection mode three (taking normal wiring as an example);
fig. 19 is a schematic diagram of the switch state (taking normal wiring as an example) of the detection mode four;
FIG. 20 is a schematic diagram of a detection procedure employed in the present invention.
In the figure, thick lines connected with the battery are main power lines (power lines for short) of the battery device, positive and negative main power lines are connected with main output contactors K3 and K4, and thin lines connected with the battery are positive and negative sampling lines.
Detailed Description
The invention improves the software and hardware on the basis of the prior art, can judge whether the wiring is normal or not and the specific type of abnormal (or called fault) wiring according to the corresponding detection result (the voltage output of the differential sampling circuit), and the working flow/detection mode can be seen in fig. 20.
The detection device mainly comprises a control system, an ADC sampling circuit (sampling circuit for short) and two switching switches K1 and K2 (see figure 1), wherein the control system can adopt a control system of battery charging and discharging equipment (battery equipment for short) or equipment for simplifying the system structure, and can be independently arranged if necessary, and can be in a proper form such as an MCU control system, the control system is connected with a battery charging and discharging equipment fault alarming and executing device (alarming device for short or alarming and executing device for short), the alarming and executing device is controlled to carry out corresponding alarming or charging and discharging actions according to the detection result, the ADC sampling circuit can adopt a differential sampling circuit, a differential amplifier is arranged, the switching switch is a single-pole double-throw (SPDT) relay or other forms of single-pole double-throw switching device suitable for electric control, two inputs (or called front ends or input ends, for example, static contact connecting terminals) and one output (called rear ends or output ends, for example, movable contact/common contact connecting terminals) are arranged, two inputs of a positive pole side switching switch K1 are respectively connected with a battery (positive pole side switching switch) and a negative pole power line (sampling line) respectively connected with a positive pole power line (sampling line) and a negative pole power line (sampling line) of the battery) are connected with a negative pole power line (sampling line) respectively), the output is connected with the input negative terminal of the differential sampling circuit (or battery sampling input negative terminal), and four connection modes, namely four detection modes, are formed according to the combination of different switch states of the two change-over switches.
Four detection modes are (see fig. 3-19):
detection mode one: positive sampling line Guan Jietong is switched on (output end is communicated with input end connected with positive sampling line and is disconnected with input end connected with positive power line), negative switching switch is connected with negative sampling line (output end is communicated with input end connected with negative sampling line and is disconnected with input end connected with negative power line):
detection mode two: positive power line Guan Jietong is switched on (output end is communicated with input end connected with positive power line and is disconnected with input end connected with positive sampling line), negative change-over switch is switched on negative power line (output end is communicated with input end connected with negative power line and is disconnected with input end connected with negative sampling line):
detection mode three: positive power line Guan Jietong is switched on (output end is communicated with input end connected with positive power line and is disconnected with input end connected with positive sampling line), negative change-over switch is connected with negative sampling line (output end is communicated with input end connected with negative sampling line and is disconnected with input end connected with negative power line):
detection mode four: positive sampling line (output end is connected with input end of positive sampling line and is disconnected with input end of positive power line), negative transfer switch is connected with negative power line (output end is connected with input end of negative power line and is disconnected with input end of negative sampling line).
Any of the four detection modes described above may be implemented by the control system appropriately controlling the state of each of the switches. For example, when the selector switch adopts a single-pole double-throw electromagnetic relay, a common contact can be connected with a differential sampling circuit, a normally closed contact is connected with a corresponding sampling line, a normally open contact is connected with a corresponding power line, and when relay coils KM1 and KM2 of the two selector switches are not powered, the common contact of the two selector switches K1 and K2 is connected with the normally closed contact, so that the detection mode I is adopted; when the two relay coils KM1 and KM2 are electrically operated, the common contact of the two change-over switches K1 and K2 is connected with the normally open contact, and the detection mode II is adopted; when the relay coil KM1 is electrified and the relay coil KM2 is not electrified, the public contact of the positive change-over switch K1 is connected with the normally open contact, and the public contact of the negative change-over switch K2 is connected with the normally closed contact, so that the detection mode III is adopted; when the relay coil KM2 is electrified and the relay coil KM1 is not electrified, the public contact of the positive change-over switch K1 is connected with the normally closed contact, and the public contact of the negative change-over switch K2 is connected with the normally open contact, so that the detection mode is the fourth mode.
Main output contactors K3 and K4 are arranged on positive and negative main power lines (main power lines of positive and negative electrodes of the battery respectively), coils KM3 and KM4 of the contactors K3 and K4 are controlled by a control system of the battery, and when no fault is detected, the device is attracted under the control of the control system to start normally.
The differential sampling circuit performs analog differential sampling on the voltages from the two switches, and accurately converts the voltages into analog signals which can be identified by the control system.
The differential sampling circuit has the negative voltage acquisition capability, and can enable the control system to identify when the wire bundles (collectively called the sampling wires and the power wires) are reversely connected.
Fig. 2 shows an embodiment of a differential sampling circuit based on the TI company (Texas Instruments) isolation op-amp AMC 1200. Wherein the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are voltage dividing resistors for sampling corresponding battery voltages (voltages accessed through corresponding switching switches), which function to reduce high voltages to within an input range of the isolation operational amplifier; u1 is an isolated operational amplifier AMC1200 with a fixed voltage gain 8, which functions to transmit the divided voltage in the form of isolated and fixed amplification factor with the signal; the first capacitor C1 and the second capacitor C2 are decoupling capacitors for isolating the power input of the operational amplifier; the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 have equal resistance values, and form a differential amplifying circuit (differential circuit) together with the operational amplifier U2B, wherein the differential amplifying circuit is input from two ends and output from one end, the differential signal is input from the isolation operational amplifier, and the voltage signal can be identified by the control system MCU; VCC and GND1 are power supply sources and power supply reference ground of a battery side, VCC is usually +5V, and power is supplied to the signal input side of the AMC 1200; AVCC and AGND are analog power supply and reference ground of the control system side and supply power for the AMC1200 signal output side; 1.25Vref is the voltage source with the voltage value of +1.25V, provides bias voltage for output signals, and enables a control system to accurately identify when negative voltage signals are collected.
As known from the circuit principle, the output voltage V of such a differential sampling circuit o The relation with the input voltage (the voltage value between the positive end of the battery sampling input and the negative end of the battery sampling input) Vin is that
When other differential sampling circuits are used, the input-output relationship should be relevant. Whether the output differential sampling result corresponds to the positive and negative electrode voltages or 0 value of the battery can be judged according to the input-output relation of the differential sampling circuit and the characteristics of the battery (or the battery pack).
The battery charge-discharge equipment control system is a main control system of the equipment, is responsible for all scheduling of the whole equipment, performs sampling control on the battery after the battery is connected, switches different switch states, and judges different fault conditions of the wrong connection of the line based on related results in each switch state (detection mode). After the control system recognizes that a fault exists, the main contactors K3 and K4 are kept to be disconnected, and information such as fault types and the like is displayed on a control screen so as to be processed in time by field personnel.
The working process or the detection method for judging the line misconnection is described below by taking the embodiment shown in the drawings as an example:
step S1 (or first step): voltage is not applied to the two single-pole double-throw relay coils KM1 and KM2, and at the moment, contacts of the two relays K1 and K2 are respectively connected with positive and negative voltage sampling lines, so that the detection mode I is adopted.
Fig. 3-9 show various possible connection states/connection modes (including normal and abnormal connection conditions) of the sampling lines according to the first detection mode, and the fault determination and treatment modes are shown in table 1 according to different detection results in the first detection mode.
TABLE 1 failure determination and handling method for detection mode one
Step S2 (or second step): and applying voltage to the coils KM1 and KM2 of the two single-pole double-throw relays, wherein contacts K1 and K2 of the two relays are connected with a positive power line and a negative power line respectively, and the two single-pole double-throw relays are in a second detection mode.
Fig. 10-16 show various possible power line connection states/connection modes (including normal and abnormal power line connection conditions) related to the second detection mode, and fault determination and processing modes are shown in table 2 according to different detection results in the second detection mode.
TABLE 2 failure determination and processing method relating to detection mode two
In step S1, if it is determined that the sampling line is connected reversely, the detection in step S1 is performed again after manual correction.
In step S2, if it is determined that the power line is connected reversely, the power line is corrected manually, and the detection in step S2 is performed again.
The order of implementing steps S1 and S2 is not limited. Step S1 may be performed first based on convenience in operation or common operation habits.
After steps S1 and S2 are performed, the results of steps S1 and S2 are combined, and four cases are respectively:
1) The result of the step S1 is abnormal (excluding the reverse connection of the sampling line), and the result of the step S2 is normal;
2) The result of the step S1 is normal, and the result of the step S2 is abnormal (after the reverse connection of the power line is eliminated);
3) The results of the steps S1 and S2 are normal;
4) The results of steps S1 and S2 are both abnormal (excluding the reverse connection of the sampling line and the power line).
Under the above cases 1, 2 and 3, the step S3 can be skipped to make further determination; in case 4, the connection fault of the sampling line and the connection fault of the power harness should be reported, and the field personnel is reminded to carry out the test again after overhauling.
Fig. 17 shows a case where the power line and the sampling line are connected to different battery packs, respectively, and the result determination in the steps S1 and S2 is not performed with abnormal wiring which is misconnected to the different battery packs, and such abnormal wiring cannot be determined only according to the results in the steps S1 and S2. Step 3 can be adopted to judge the abnormal connection of the different battery packs and further detect the abnormal results of the steps S1 and S2. However, step S3 may not be performed in a case where abnormality of the wiring across the different battery packs is not involved/detection of abnormality of the wiring across the different battery packs is not required or in a case where further recognition/resolution of the abnormal results of steps S1, S2 is not required.
Step S3 (or third step) comprises the following two steps (or sub-steps):
step S31: applying voltage to a single-pole double-throw relay coil KM1 at the positive electrode side, applying no voltage to a single-pole double-throw relay coil KM2 at the negative electrode side, wherein a contact of a relay K1 is connected with a positive power line, a contact of the relay K2 is connected with a negative sampling line, and recording a detection result in a detection mode III;
step S32: and applying voltage to the single-pole double-throw relay coil KM2 at the negative electrode side, wherein the single-pole double-throw relay coil KM1 at the positive electrode side does not apply voltage, at the moment, a contact of the relay K1 is connected with a positive sampling line, a contact of the relay K2 is connected with a negative power line, and the single-pole double-throw relay coil is in a detection mode IV and records a detection result in the detection mode IV.
The order of implementing steps S31 and S32 is not limited.
And combining the detection results of the steps S1 and S2, and determining and processing the faults according to different detection results of the step S3, wherein the fault determination and processing modes are shown in a table 3.
TABLE 3 failure determination method for detection modes III and IV
Since open circuit and unconnected are equivalent, the two faults cannot be resolved from the above detection results, and should be usually checked manually. Since the possibility of disconnection of the power line is small, when it is determined that the power line is disconnected/disconnected as a result, the disconnection fault can be alerted as a result of the disconnection.
In practice, part of the detection content can be selected according to actual needs to achieve the required detection purpose. For example, in the case where connection of different wire harnesses to different devices does not occur, or in the case where the probability of occurrence of such a case is so small that no special detection is required or other processing means are provided for this case, the detection and determination concerning abnormality of the wiring of the power line and the sampling line to the different battery packs, respectively, may not be performed; for another example, in the case that another detection/processing method is provided for a specific type of abnormal wiring after abnormal wiring is found, no further detection of abnormal wiring is required.
Compared with the existing detection device which can only detect partial wiring abnormality, the invention can effectively detect all 5 wiring faults frequently encountered when the battery is tested by using the charge-discharge test equipment, greatly reduces potential safety hazards caused by misconnection, does not increase devices, circuits, devices and the like, can utilize the data processing capacity and control mode of the existing control system to analyze, judge and control the detection result, and adopts corresponding countermeasures, such as not starting the equipment and alarming, when the wiring abnormality is detected, the invention avoids the potential safety hazards caused by the wiring abnormality, has low cost and is easy to realize.
The term input (or input) and output (or output) of the switch in this specification is merely descriptive convenience, so as to separate two ends of the switch, and does not represent that the switch has unidirectional properties.
The preferred and optional technical means disclosed in the invention may be combined arbitrarily to form a plurality of different technical schemes, except for the specific description and the further limitation that one preferred or optional technical means is another technical means.
Claims (10)
1. The utility model provides a detection device of battery charge-discharge test equipment circuit misconnection, its characterized in that includes change over switch and differential sampling circuit, the change over switch is single-pole double-throw switch, and quantity is two, including positive change over switch and negative change over switch, and the output of positive change over switch inserts differential sampling circuit's battery sampling input positive terminal, and positive change over switch's first input is positive sampling line link, and positive change over switch's second input is positive power line link, and differential sampling circuit's battery sampling input negative terminal is inserted to negative change over switch's output terminal, and negative change over switch's first input is negative sampling line link, and negative change over switch's second input is negative power line link.
2. The device for detecting the misconnection of the circuit of the battery charge and discharge testing equipment according to claim 1, wherein the differential sampling circuit is provided with a differential amplifying circuit, and the non-inverting input end of the differential amplifying circuit is connected with a positive voltage source for providing bias voltage.
3. The device for detecting line misconnection of battery charge-discharge test equipment according to claim 1 or 2, wherein the output of the differential sampling circuit is connected to the control system, and the control system makes a wiring abnormality judgment according to the differential sampling result output by the differential sampling circuit in the corresponding detection mode.
4. The device for detecting the misconnection of the circuit of the battery charge and discharge test equipment according to claim 3, wherein the change-over switch adopts a single-pole double-throw relay, and the control system controls the on-off state of each relay coil to control the on-off state of the change-over switch so as to realize a required detection mode.
5. The detection method for the line misconnection of the battery charge and discharge test equipment is characterized in that the detection device is adopted to detect the line connection abnormality of the battery charge and discharge test equipment, the control system of the battery equipment controls the switching state of each change-over switch to realize a required detection mode, and the judgment of the line connection abnormality is carried out according to the output of a differential sampling circuit in the relevant detection mode.
6. The method for detecting the misconnection of the circuit of the battery charge and discharge test equipment according to claim 5, comprising the following detection steps:
step S1: the control system controls each change-over switch to enter a switch state of a first detection mode, and judges that the sampling line is connected abnormally according to a differential sampling result of a differential sampling circuit in the first detection mode, and judges that the sampling line is connected normally when the differential sampling result corresponds to a positive value of the battery voltage; when the differential sampling result corresponds to a negative value of the battery voltage, determining that the sampling line is reversely connected; when the differential sampling result corresponds to the 0 value of the battery voltage, judging that the wiring of the sampling line is abnormal, wherein the switch state of the first detection mode is that the positive sampling line is switched on by the tangent Guan Jietong, and the negative sampling line is switched on by the negative switching switch;
step S2: the control system controls each change-over switch to enter a switch state of a second detection mode, power line wiring abnormality judgment is carried out according to a differential sampling result of a differential sampling circuit in the second detection mode, and when the differential sampling result corresponds to a positive value of battery voltage, the power line wiring is judged to be normal; when the differential sampling result corresponds to a negative value of the battery voltage, determining that the power line is reversely connected; when the differential sampling result corresponds to the value 0 of the battery voltage, the power line connection abnormality is judged, the switch condition of the second detection mode is that the positive power line is switched off by the tangent Guan Jietong, and the negative power line is switched on by the negative change-over switch.
7. The method for detecting the wrong connection of the circuit of the battery charge and discharge testing equipment according to claim 6, wherein in the case of judging that the sampling line is connected reversely, a fault alarm of the connection reversely of the sampling line is carried out, and after the sampling line is manually rewired, the step S1 is carried out again until the judging result is not the connection reversely of the sampling line; and (2) when the power line connection is judged to be reversed, performing fault alarm of the power line connection, and after the power line is manually rewired, re-implementing the step (S2) until the judgment result is not the power line connection reversal.
8. The method for detecting the line misconnection of the battery charge and discharge test equipment according to claim 7, wherein in the case that the judging results of the step S1 and the step S2 are both normal in connection, the step S3 is implemented, the control system controls each switch to enter a switch state of a detecting mode three to obtain a differential sampling result in the detecting mode three, controls each switch to enter a switch state of a detecting mode four to obtain a differential sampling result in the detecting mode four, and performs comprehensive connection abnormality judgment according to the differential sampling results in the detecting mode three and the detecting mode four, and when the differential sampling results in the detecting mode three and the detecting mode four are both positive values corresponding to battery voltage, the judgment is normal; when the differential sampling results in the detection mode III and the detection mode IV are both 0 values corresponding to the battery voltage, judging that the power line and the sampling line are not in the same loop, wherein the switch state of the detection mode III is that the positive power line is switched on by the positive switch Guan Jietong, and the negative switch is switched on by the negative sampling line; the switch status of the detection mode four is positive sampling line of positive switch Guan Jietong, and negative switch turns on negative power line.
9. The method for detecting the line misconnection of the battery charge and discharge test equipment according to claim 7, wherein in the case that the judgment result of the step S1 is that the connection is normal and the judgment result of the step S2 is that the connection is abnormal, implementing the step S3, the control system controls each switch to enter a switch state of a detection mode three to obtain a differential sampling result in the detection mode three, controls each switch to enter a switch state of a detection mode four to obtain a differential sampling result in the detection mode three, and performs comprehensive connection abnormality judgment according to the differential sampling results in the detection mode three and the detection mode four, and when the differential sampling result in the detection mode three is a 0 value corresponding to the battery voltage and the differential sampling result in the detection mode four is a positive value corresponding to the battery voltage, determining that the connection of a positive power line is abnormal and the connection of a negative power line is normal; when the differential sampling result in the third detection mode is a positive value corresponding to the battery voltage and the differential sampling result in the fourth detection mode is a 0 value corresponding to the battery voltage, judging that the positive power line is normal in wiring and the negative power line is abnormal in wiring; when the differential sampling result in the third detection mode and the differential sampling result in the fourth detection mode are both 0 values corresponding to the battery voltage, judging that the connection of the positive power line and the negative power line is abnormal, wherein the switch state of the third detection mode is that the positive power line is switched on by the positive switch Guan Jietong, and the negative switch is switched on by the negative switch; the switch status of the detection mode four is positive sampling line of positive switch Guan Jietong, and negative switch turns on negative power line.
10. The method for detecting the line misconnection of the battery charge and discharge test equipment according to claim 7, wherein when the judging result of the step S1 is abnormal in connection and the judging result of the step S2 is normal in connection, the step S3 is implemented, the control system controls each switch to enter a switch state of a detecting mode three to obtain a differential sampling result in the detecting mode three, controls each switch to enter a switch state of a detecting mode four to obtain a differential sampling result in the detecting mode three, and carries out comprehensive connection abnormality judgment according to the differential sampling results in the detecting mode three and the detecting mode four, and when the differential sampling result in the detecting mode three is a positive value corresponding to the battery voltage and the differential sampling result in the detecting mode four is a 0 value corresponding to the battery voltage, the positive sampling line is judged to be abnormal in connection and the negative sampling line is judged to be normal in connection; when the differential sampling result in the third detection mode is a value corresponding to 0 value of the battery voltage and the differential sampling result in the fourth detection mode is a positive value corresponding to the battery voltage, judging that the positive sampling line is normal in wiring and the negative sampling line is abnormal in wiring; when the differential sampling result in the third detection mode and the differential sampling result in the fourth detection mode are both 0 values corresponding to the battery voltage, the positive sampling line and the negative sampling line are judged to be abnormal in wiring, the switch state of the third detection mode is that the positive power line is switched on by the positive switch Guan Jietong, and the negative switch is switched on by the negative sampling line; the switch status of the detection mode four is positive sampling line of positive switch Guan Jietong, and negative switch turns on negative power line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211538049.3A CN116125315B (en) | 2022-12-02 | 2022-12-02 | Detection device and detection method for line misconnection of battery charge and discharge test equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211538049.3A CN116125315B (en) | 2022-12-02 | 2022-12-02 | Detection device and detection method for line misconnection of battery charge and discharge test equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116125315A CN116125315A (en) | 2023-05-16 |
| CN116125315B true CN116125315B (en) | 2024-02-02 |
Family
ID=86303542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211538049.3A Active CN116125315B (en) | 2022-12-02 | 2022-12-02 | Detection device and detection method for line misconnection of battery charge and discharge test equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116125315B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202758054U (en) * | 2012-08-29 | 2013-02-27 | 微宏动力系统（湖州）有限公司 | Battery pack charging detection system |
| CN104076285A (en) * | 2013-03-27 | 2014-10-01 | 深圳市海洋王照明工程有限公司 | Battery charging and discharging test fixture |
| CN104793169A (en) * | 2015-04-30 | 2015-07-22 | 重庆长安汽车股份有限公司 | Fault injection device for new energy automobile battery management system tests |
| CN108631011A (en) * | 2017-03-24 | 2018-10-09 | 中兴通讯股份有限公司 | A kind of battery connecting apparatus |
| WO2018230115A1 (en) * | 2017-06-14 | 2018-12-20 | 三洋電機株式会社 | Battery pack, method for detecting abnormality in battery pack, method for controlling charging of battery pack, and charging control programming for battery pack |
| CN109188295A (en) * | 2018-09-06 | 2019-01-11 | 广州锦红源电子科技有限公司 | Battery cell failure simulator |
| CN209992650U (en) * | 2019-03-22 | 2020-01-24 | 杭州协能科技股份有限公司 | Battery wire harness detection circuit |
| CN111934306A (en) * | 2020-08-20 | 2020-11-13 | 浙江树人学院（浙江树人大学） | Battery sampling line misconnection protection circuit and method in BMS system |
| CN212540653U (en) * | 2020-05-09 | 2021-02-12 | 威马汽车科技集团有限公司 | Power battery package sampling loop detection device |
| CN114839459A (en) * | 2022-04-15 | 2022-08-02 | 广东恒翼能科技有限公司 | Battery charging and discharging equipment precision and line order calibration frock |
-
2022
- 2022-12-02 CN CN202211538049.3A patent/CN116125315B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202758054U (en) * | 2012-08-29 | 2013-02-27 | 微宏动力系统（湖州）有限公司 | Battery pack charging detection system |
| CN104076285A (en) * | 2013-03-27 | 2014-10-01 | 深圳市海洋王照明工程有限公司 | Battery charging and discharging test fixture |
| CN104793169A (en) * | 2015-04-30 | 2015-07-22 | 重庆长安汽车股份有限公司 | Fault injection device for new energy automobile battery management system tests |
| CN108631011A (en) * | 2017-03-24 | 2018-10-09 | 中兴通讯股份有限公司 | A kind of battery connecting apparatus |
| WO2018230115A1 (en) * | 2017-06-14 | 2018-12-20 | 三洋電機株式会社 | Battery pack, method for detecting abnormality in battery pack, method for controlling charging of battery pack, and charging control programming for battery pack |
| CN109188295A (en) * | 2018-09-06 | 2019-01-11 | 广州锦红源电子科技有限公司 | Battery cell failure simulator |
| CN209992650U (en) * | 2019-03-22 | 2020-01-24 | 杭州协能科技股份有限公司 | Battery wire harness detection circuit |
| CN212540653U (en) * | 2020-05-09 | 2021-02-12 | 威马汽车科技集团有限公司 | Power battery package sampling loop detection device |
| CN111934306A (en) * | 2020-08-20 | 2020-11-13 | 浙江树人学院（浙江树人大学） | Battery sampling line misconnection protection circuit and method in BMS system |
| CN114839459A (en) * | 2022-04-15 | 2022-08-02 | 广东恒翼能科技有限公司 | Battery charging and discharging equipment precision and line order calibration frock |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116125315A (en) | 2023-05-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104391241A (en) | High-voltage relay state detection circuit of power battery and method thereof | |
| CN110907853B (en) | Load state detection circuit and method | |
| CN109739211B (en) | Diagnosis system for load circuit and electric vehicle | |
| CN204575757U (en) | Charger output characteristics automatic detection device | |
| CN105676091A (en) | Battery pack insulation detection apparatus and insulation detection method thereof | |
| CN104777377B (en) | Lead-acid battery charger output characteristics detecting system and its detection method | |
| CN217467117U (en) | Battery detection device and battery detection system | |
| CN102023271A (en) | Spare power automatic switching logic test method for verifying automatic switching modes of high voltage side buscouple switch | |
| CN208969217U (en) | Lead-acid batteries run detection system | |
| CN114137427B (en) | Method for automatically checking capacity of single storage battery in storage battery pack | |
| CN104655907A (en) | Assembled-battery voltage detection device | |
| CN116125315B (en) | Detection device and detection method for line misconnection of battery charge and discharge test equipment | |
| CN100413141C (en) | Galvanic battery with detection unit | |
| CN111999663A (en) | Battery connecting wire breakage detection device | |
| CN111509310A (en) | Method and device for online testing performance of storage battery of direct current system of transformer substation | |
| CN216956276U (en) | Device for judging state of multi-path high-voltage fuse and contactor | |
| CN108303656B (en) | Battery pack charge-discharge testing device | |
| CN107783029B (en) | Test system and test method for PCBA (printed circuit board assembly) | |
| CN102095951B (en) | Spare power automatic switching logic test method for checking automatic switching mode of low-pressure side section switch | |
| CN208589506U (en) | A kind of electric automobile power battery charge and discharge electric detection means | |
| CN102087527B (en) | Backup auto-switching logic testing method for checking changeover manner of power transmission line | |
| CN212540657U (en) | Automatic detection charging device and system for battery | |
| CN211741541U (en) | High-voltage load test box | |
| CN210835055U (en) | Switching operation guiding device | |
| CN111313493A (en) | Self-healing type direct-current power supply protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |