CN111413632A - Test circuit and test method for charge and discharge activation of lithium battery pack finished product - Google Patents
Test circuit and test method for charge and discharge activation of lithium battery pack finished product Download PDFInfo
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- 230000004913 activation Effects 0.000 title claims abstract description 64
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 60
- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 238000010998 test method Methods 0.000 title claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims description 36
- 238000005070 sampling Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims description 6
- 150000004706 metal oxides Chemical class 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 6
- 230000003213 activating effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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Abstract
The invention provides a test circuit and a test method for charge and discharge activation of a lithium battery pack finished product, wherein the test circuit comprises a main control circuit, a small current constant current control circuit, a linear regulation control circuit, a constant voltage constant current control circuit and a voltage current acquisition circuit; the small current constant current control circuit, the constant voltage constant current control circuit and the voltage current acquisition circuit are all connected with the main control circuit; the small current constant current control circuit is connected with the linear regulation control circuit; the voltage and current acquisition circuit is connected with the constant voltage and constant current control circuit; the constant voltage and constant current control circuit is connected with the linear regulation control circuit; and during testing, the linear regulation control circuit and the voltage and current acquisition circuit are connected with a finished lithium battery pack product. The invention has the advantages that: the small current required by charging and discharging activation can be directly enabled and controlled to be output, the response speed is high, and the function of quickly responding and activating the charging and discharging of the finished lithium battery pack can be well met.
Description
Technical Field
The invention relates to the field of lithium battery pack testing, in particular to a testing circuit and a testing method for charge and discharge activation of a finished product of a lithium battery pack.
Background
Along with the improvement of the requirement of manufacturers on production capacity and the upgrade of the design of finished lithium battery packs, the existing finished lithium battery packs generally require to test the related charge-discharge protection functions, other related indexes and the like in the production process, the total time of the whole test process needs to be controlled to be about 5 seconds, and the response time of charge-discharge activation of the finished lithium battery packs is a restriction factor influencing the whole test efficiency. At present, a method for charging and discharging finished lithium battery pack products is to output a small current to activate a constant-voltage constant-current source circuit sharing test equipment, and as the main power output charging and discharging circuit of the constant-voltage constant-current source needs to take the whole output characteristic and loading characteristic into consideration, the method cannot meet the requirement of quick small-current loading and output, and cannot meet the requirement of quick response for activating the charging and discharging functions of the finished lithium battery pack products.
Upon search, there are two patents in the prior art relating to battery activation: first, application No. 2015.05.15, application No.: the chinese patent invention 201510249730.X discloses an activation circuit and method for a mobile device battery, which can activate a battery protection board by only inserting a charger to charge the battery without disconnecting the battery and a load under any condition; however, the use environment of the activation circuit and the method is limited, and the activation circuit and the method cannot be applied to the test application of the whole index production line of the lithium battery pack finished product on the production line. Secondly, the Chinese utility model patent with the application date of 2014.03.24 and the application number of 201420133342.6 discloses a lithium battery pack charge and discharge activation device which can realize charge and discharge activation under the condition that no commercial power and special charge and discharge activation equipment are available; however, the activation device is also limited in use environment, and the device is large in overall size, so that the activation device cannot be applied to the assembly line test of the overall indexes of the finished lithium battery pack on the production line.
Disclosure of Invention
The invention aims to solve the technical problem of providing a test circuit and a test method for charge and discharge activation of a finished lithium battery pack product, and solving the problem that the prior art cannot meet the requirement of quick response activation of the charge and discharge function of the finished lithium battery pack product.
The invention is realized by the following steps: a test circuit for charge and discharge activation of a lithium battery pack finished product comprises a main control circuit, a low-current constant-current control circuit, a linear regulation control circuit, a constant-voltage constant-current control circuit and a voltage and current acquisition circuit;
the small current constant current control circuit, the constant voltage constant current control circuit and the voltage current acquisition circuit are all connected with the main control circuit; the small current constant current control circuit is connected with the linear regulation control circuit; the voltage and current acquisition circuit is connected with the constant voltage and constant current control circuit; the constant voltage and constant current control circuit is connected with the linear regulation control circuit;
during testing, the linear regulation control circuit and the voltage and current acquisition circuit are connected with a finished lithium battery pack product;
when the lithium battery pack charging and discharging device works, the main control circuit enables to trigger the small-current constant-current control circuit to output small current, and the linear regulation control circuit is driven by the small-current enable to carry out charging and discharging activation on a lithium battery pack finished product; or the main control circuit enables to trigger the constant-voltage constant-current control circuit to output a high level, and the linear regulation control circuit is driven to output a voltage current value through the high level;
the voltage and current acquisition circuit acquires the voltage and current values on the loop in real time; the voltage and current acquisition circuit feeds back the acquired voltage and current values to the constant-voltage and constant-current control circuit so that the constant-voltage and constant-current control circuit adjusts the voltage and current output of the linear regulation control circuit; and the voltage and current acquisition circuit provides the acquired voltage and current values for the main control circuit to carry out real-time monitoring processing.
Further, the constant voltage and constant current control circuit comprises a voltage operational amplifier, a current operational amplifier, a first diode and a second diode;
the positive input ends of the voltage operational amplifier and the current operational amplifier are connected with the main control circuit, and the negative input ends of the voltage operational amplifier and the current operational amplifier are connected with the voltage and current acquisition circuit; the output ends of the voltage operational amplifier and the current operational amplifier are connected with the linear regulation control circuit; the first diode is connected in parallel at the output end of the current operational amplifier, and the second diode is connected in parallel at the output end of the voltage operational amplifier.
Further, the linear regulation control circuit comprises a first MOS tube and a first resistor;
the G pole of the first MOS tube is connected with the constant-voltage constant-current control circuit, and the D pole of the first MOS tube is connected with a first power supply; the S pole of the first MOS tube is respectively connected with the positive voltage sampling end of the voltage and current acquisition circuit and the positive voltage output end of the small current constant current control circuit; one end of the first resistor is connected with the negative voltage sampling end of the voltage and current acquisition circuit, the positive current sampling end of the voltage and current acquisition circuit and the negative voltage output end of the small current constant current control circuit respectively, and the other end of the first resistor is connected with the ground and the negative current sampling end of the voltage and current acquisition circuit respectively.
Further, the voltage and current acquisition circuit comprises a voltage acquisition operational amplifier and a current acquisition operational amplifier;
the input end of the voltage acquisition operational amplifier is connected with the two voltage output ends of the linear regulation control circuit, and the output ends of the voltage acquisition operational amplifier are respectively connected with the main control circuit and the constant voltage and constant current control circuit;
the input end of the current acquisition operational amplifier is connected with the two current acquisition ends of the linear regulation control circuit, and the output end of the current acquisition operational amplifier is respectively connected with the main control circuit and the constant voltage and constant current control circuit.
Further, the small current constant current control circuit comprises a first optical coupler, a second MOS (metal oxide semiconductor) transistor, a third MOS transistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor;
the end C of the first optical coupler is connected with a first power supply through the second resistor, the end A of the first optical coupler is connected with a second power supply through the fifth resistor, and the end K of the first optical coupler is connected with the pole D of the second MOS tube; the G pole of the second MOS tube is connected with the main control circuit, and the S pole of the second MOS tube is grounded;
the A end of the second optical coupler is connected with a second power supply through the sixth resistor, and the K end of the second optical coupler is connected with the D pole of the third MOS tube; the G pole of the third MOS tube is connected with the main control circuit, and the S pole of the third MOS tube is grounded;
the end E of the second optocoupler is connected with the negative voltage output end of the linear regulation control circuit through the third resistor; and a positive voltage output end of the linear regulation control circuit is respectively connected with the end E of the first optical coupler and the end A of the second optical coupler through the fourth resistor.
Further, the second resistor and the third resistor are both adjustable resistors.
Further, the main control circuit adopts a TMS320F28377S chip.
The invention is realized by the following steps: a test method for charge and discharge activation of a finished product of a lithium battery pack needs to use the test circuit; the test method comprises the following steps:
when a charging activation test is carried out, an enabling charging activation control signal is sent to the low-current constant-current control circuit through the main control circuit; after receiving an enabling charging activation control signal, the small-current constant-current control circuit enables a second MOS tube in the small-current constant-current control circuit to be controlled to be conducted, and then a first optical coupler in the small-current constant-current control circuit is triggered to be conducted, so that a first power supply VCC is directly loaded to two ends of a lithium battery pack finished product through a second resistor of the small-current constant-current control circuit to be charged and activated;
when a discharge activation test is carried out, an enabling discharge activation control signal is sent to the low-current constant-current control circuit through the main control circuit; and after receiving the enabling discharge activation control signal, the small-current constant-current control circuit enables to control the conduction of a third MOS (metal oxide semiconductor) tube in the small-current constant-current control circuit, and further triggers the conduction of a second optical coupler in the small-current constant-current control circuit, so that two ends of a finished lithium battery pack are directly connected to a third resistor of the small-current constant-current control circuit for discharge activation.
Further, the test method further comprises:
when overcurrent protection test is carried out after activation, a voltage output value V is set through the main control circuitsetAnd the current output value IsetWill VsetAnd IsetThe signal is output to the constant voltage and constant current control circuit; the constant voltage and constant current control circuit receives VsetAnd IsetAfter the signal is sent, enabling to output a high level to drive a first MOS tube in the linear regulation control circuit to be conducted, thereby outputting a voltage current value;
the voltage and current acquisition circuit acquires voltage VFB and current IFB in a loop; the voltage and current acquisition circuit feeds back acquired voltage VFB and IFB current signals to the constant-voltage and constant-current control circuit in real time so that the constant-voltage and constant-current control circuit adjusts and drives the conduction degree of a first MOS (metal oxide semiconductor) tube in the linear regulation control circuit, and the linear regulation control circuit stably outputs a required voltage and current value; and the voltage and current acquisition circuit feeds back acquired voltage VFB and current IFB signals to the main control circuit in real time so as to supply the main control circuit to perform real-time monitoring processing.
The invention has the following advantages: two groups of circuits, namely a small current constant-current control circuit and a constant voltage constant-current control circuit, are designed to be used in a combined mode, the two groups of circuits of the constant voltage constant-current control circuit are started when the protection function of a finished lithium battery product is tested, and the small current constant-current control circuit is started when the charge and discharge function of the finished lithium battery product is tested; the small current constant current control circuit can directly enable the control output of the small current required by charging and discharging activation, so that the response speed is high, and the function of quickly responding and activating the charging and discharging of the finished lithium battery pack can be well met. Meanwhile, after the lithium battery pack finished product is activated, the protection function can be directly tested through the constant-voltage constant-current control circuit, so that the lithium battery pack is very convenient to use.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic circuit block diagram of a test circuit for charge and discharge activation of a lithium battery pack finished product according to the present invention.
Fig. 2 is a circuit configuration diagram of the main control circuit of the present invention.
Fig. 3 is a circuit configuration diagram of the constant voltage and constant current control circuit and the linear regulation control circuit of the present invention.
Fig. 4 is a circuit configuration diagram of the voltage current collecting circuit of the present invention.
Fig. 5 is a circuit configuration diagram of the small current constant current control circuit of the present invention.
Detailed Description
Referring to fig. 1 to 5, in a preferred embodiment of a test circuit 100 for charge and discharge activation of a lithium battery pack finished product according to the present invention, the test circuit 100 includes a main control circuit 1, a small current constant current control circuit 2, a linear regulation control circuit 3, a constant voltage constant current control circuit 4, and a voltage current acquisition circuit 5;
the small current constant current control circuit 2, the constant voltage constant current control circuit 4 and the voltage current acquisition circuit 5 are all connected with the main control circuit 1; the small current constant current control circuit 2 is connected with the linear regulation control circuit 3; the voltage and current acquisition circuit 5 is connected with the constant voltage and constant current control circuit 4; the constant voltage and constant current control circuit 4 is connected with the linear regulation control circuit 3;
during testing, the linear regulation control circuit 3 and the voltage and current acquisition circuit 5 are connected with the lithium battery pack finished product 200;
when the lithium battery pack finished product 200 works, the main control circuit 1 enables and triggers the low-current constant-current control circuit 2 to output low current, and the linear regulation control circuit 3 is driven by the low-current enable to carry out charging and discharging activation on the lithium battery pack finished product 200; or the main control circuit 1 enables to trigger the constant voltage and constant current control circuit 4 to output high level, and the linear regulation control circuit 3 is driven to output voltage and current values through high level enabling;
the voltage and current acquisition circuit 5 acquires the voltage and current value on the loop in real time; the voltage and current acquisition circuit 5 feeds back the acquired voltage and current values to the constant voltage and constant current control circuit 4 so that the constant voltage and constant current control circuit 4 can adjust the voltage and current output of the linear regulation control circuit 3; the voltage and current acquisition circuit 5 provides the acquired voltage and current values for the main control circuit 1 to perform real-time monitoring processing, and during specific implementation, the main control circuit 1 performs processing such as collection, monitoring and display on the received voltage and current values. The main control circuit is realized by adopting a TMS320F28377S chip.
In the present embodiment, please refer to fig. 3, wherein the constant voltage and constant current control circuit 4 includes a voltage operational amplifier N1A, a current operational amplifier N1B, a first diode D1 and a second diode D2;
the positive input ends of the voltage operational amplifier N1A and the current operational amplifier N1B are connected with the main control circuit 1; the negative input ends of the voltage operational amplifier N1A and the current operational amplifier N1B are connected with the voltage and current acquisition circuit 5; the output ends of the voltage operational amplifier N1A and the current operational amplifier N1B are connected with the linear regulation control circuit 3; the first diode D1 is connected in parallel at the output end of the current operational amplifier N1B, and the second diode D2 is connected in parallel at the output end of the voltage operational amplifier N1A. The voltage operational amplifier N1A and the current operational amplifier N1B can be realized by adopting an ADA4522-2 operational amplifier.
In the constant-voltage constant-current control circuit 4, two input ends of the voltage operational amplifier N1A are respectively provided with a resistor R7 and a resistor R9, and an output end of the voltage operational amplifier N1A is provided with a resistor R8; two input ends of the current operational amplifier N1B are respectively provided with a resistor R1 and a resistor R3, and an output end of the current operational amplifier N1B is provided with a resistor R2; the resistor R7, the resistor R9, the resistor R1 and the resistor R3 mainly play a matching role, and the resistor R8 and the resistor R2 mainly play a driving role. Wherein, the first diode D1 mainly plays a role of accelerating the turn-off and protection resistor R2, and the second diode D2 mainly plays a role of accelerating the turn-off and protection resistor R8.
When the constant voltage and constant current control circuit 4 works, when the constant voltage and constant current control circuit 4 receives the V set and output by the main control circuit 1setAnd IsetWhen the signal is sent, the voltage operational amplifier N1A and the current operational amplifier N1B are enabled to output high level to the linear regulation control circuit 3. When the constant voltage and constant current control circuit 4 receives the voltage VFB and current IFB signals fed back by the voltage and current acquisition circuit 5, the voltage operational amplifier N1A and the current operational amplifier N1B are enabled to adjust the output high level.
In the present embodiment, please refer to fig. 3, wherein the linear regulation control circuit 3 includes a first MOS transistor Q1 and a first resistor R6;
the G pole of the first MOS transistor Q1 is connected with the constant-voltage constant-current control circuit 4, and the D pole of the first MOS transistor Q1 is connected with a first power supply VCC; the S pole of the first MOS tube Q1 is respectively connected with the positive voltage sampling end of the voltage and current acquisition circuit 5 and the positive voltage output end of the small current constant current control circuit 2; one end of the first resistor R6 is connected to the negative voltage sampling end of the voltage and current collecting circuit 5, the positive current sampling end of the voltage and current collecting circuit 5, and the negative voltage output end of the small current constant current control circuit 2, and the other end of the first resistor R6 is connected to the ground GND and the negative current sampling end of the voltage and current collecting circuit 5. The third resistor R6 is mainly used for sampling.
When the linear regulation control circuit 3 works, the output end PV +/PV-of the linear regulation control circuit 3 needs to be connected to the finished lithium battery product 200, so that the voltage output by the linear regulation control circuit 3 is loaded on the finished lithium battery product 200 for activation or testing; when the linear regulation control circuit 3 receives the high level output by the constant voltage and constant current control circuit 4, the first MOS transistor Q1 is driven to be turned on, so as to output a voltage current value. Meanwhile, the first MOS transistor Q1 is driven to adjust the conduction degree according to the high level of the output regulated by the constant voltage and constant current control circuit 4, so as to realize stable output of the required voltage and current values.
In the present embodiment, please refer to fig. 4, wherein the voltage and current collecting circuit 5 includes a voltage collecting operational amplifier N2A and a current collecting operational amplifier N2B;
the input end of the voltage acquisition operational amplifier N2A is connected with the two voltage output ends of the linear regulation control circuit 3, and the output end of the voltage acquisition operational amplifier N2A is respectively connected with the main control circuit 1 and the constant voltage and constant current control circuit 4;
the input end of the current collecting operational amplifier N2B is connected with the two current collecting ends of the linear adjusting control circuit 3, and the output end of the current collecting operational amplifier N2B is respectively connected with the main control circuit 1 and the constant voltage and constant current control circuit 4. The voltage acquisition operational amplifier N2A and the current acquisition operational amplifier N2B can be realized by adopting an ADA4522-2 operational amplifier.
In the voltage and current acquisition circuit 5, a resistor R16 is arranged at the negative input end of the voltage acquisition operational amplifier N2A, a resistor R13 and a resistor R14 are arranged at the positive input end of the voltage acquisition operational amplifier N2A in parallel, and one end of the resistor R13 is grounded to GND; the negative input end of the current collecting operational amplifier N2B is provided with a resistor R23, the positive input end of the voltage collecting operational amplifier N2B is provided with a resistor R20 and a resistor R19 in parallel, and one end of the resistor R19 is grounded GND; the output end of the voltage acquisition operational amplifier N2A is provided with a resistor R15, and a resistor R18 is arranged between the output end and the negative input end of the voltage acquisition operational amplifier N2A; the output end of the current collecting operational amplifier N2B is provided with a resistor R22, and a resistor R26 is arranged between the output end and the negative input end of the current collecting operational amplifier N2B; the resistor R13, the resistor R14, the resistor R16, the resistor R19, the resistor R20 and the resistor R23 mainly play a matching role, and the resistor R15, the resistor R18, the resistor R22 and the resistor R26 mainly play a driving role.
When the voltage and current acquisition circuit 5 works, the voltage output by the linear regulation control circuit 3 can be acquired through the voltage acquisition operational amplifier N2A, and the current of the first resistor R6 in the linear regulation control circuit 3 can be acquired through the current acquisition operational amplifier N2B; and feeding back the collected voltage VFB and current IFB signals to the main control circuit 1 and the constant voltage and constant current control circuit 4 respectively.
In this embodiment, please refer to fig. 5, wherein the small-current constant-current control circuit 2 includes a first optical coupler U1, a second optical coupler U2, a second MOS transistor Q2, a third MOS transistor Q3, a second resistor R4, a third resistor R21, a fourth resistor R12, a fifth resistor R5, and a sixth resistor R17;
the end C of the first optical coupler U1 is connected with a first power supply VCC through the second resistor R4, the end A of the first optical coupler U1 is connected with a second power supply VDD through the fifth resistor R5, and the end K of the first optical coupler U1 is connected with the pole D of the second MOS transistor Q2; the G pole of the second MOS tube Q2 is connected with the main control circuit 1, and the S pole of the second MOS tube Q2 is grounded GND;
an end A of the second optical coupler U2 is connected with a second power supply VDD through the sixth resistor R17, and an end K of the second optical coupler U2 is connected with an electrode D of the third MOS transistor Q3; the G pole of the third MOS tube Q3 is connected with the main control circuit 1, and the S pole of the third MOS tube Q3 is grounded GND;
the end E of the second optical coupler U2 is connected with the negative voltage output end of the linear regulation control circuit 3 through the third resistor R21; and a positive voltage output end of the linear regulation control circuit 3 is respectively connected with an end E of the first optical coupler U1 and an end A of the second optical coupler U2 through the fourth resistor R12. The second resistor R4 and the third resistor R21 are both adjustable resistors, and different resistance values can be selected according to actual test requirements during specific implementation so as to control the magnitude of the output current; the second resistor R4, the third resistor R21 and the fourth resistor R12 all play a role in constant current; the fifth resistor R5 and the sixth resistor R17 mainly play a role in limiting current.
In the small-current constant-current control circuit 2, a resistor R10 is connected to the G pole of the second MOS transistor Q2, and a resistor R11 is connected between the G pole and the S pole of the second MOS transistor Q2; a resistor R24 is connected to the G pole of the third MOS transistor Q3, and a resistor R25 is connected between the G pole and the S pole of the third MOS transistor Q3; the resistor R10, the resistor R11, the resistor R24, and the resistor R25 all function as a driver. The first optical coupler U1 and the second optical coupler U2 both adopt AQY212S optical couplers.
When the small-current constant-current control circuit 2 works, when the small-current constant-current control circuit 2 receives an enable charging activation control signal sent by the main control circuit 1, the enable control circuit enables the conduction of a second MOS transistor Q2 in the small-current constant-current control circuit 2, and further triggers the conduction of a first optical coupler U1, so that a first power supply VCC is directly loaded to two ends of a lithium battery pack finished product 200 through a second resistor R4 of the small-current constant-current control circuit 2 for charging activation. When the small-current constant-current control circuit 2 receives an enable discharge activation control signal sent by the main control circuit 1, enabling to control the conduction of a third MOS transistor Q3 in the small-current constant-current control circuit 2, and further triggering the conduction of a second optical coupler U2, so that two ends of a lithium battery pack finished product 200 are directly connected to a third resistor R21 of the small-current constant-current control circuit 2 for discharge activation.
The invention also provides a test method for the charge and discharge activation of the finished product of the lithium battery pack, wherein the test circuit 100 is required to be used in the test method; the test method comprises the following steps:
when a charging activation test is carried out, an enabling charging activation control signal CHG-COM is sent to the low-current constant-current control circuit 2 through the main control circuit 1; after the small-current constant-current control circuit 2 receives an enable charging activation control signal CHG-COM, enabling to control a second MOS tube Q2 in the small-current constant-current control circuit 2 to be conducted, and further triggering a first optical coupler U1 in the small-current constant-current control circuit 2 to be conducted, so that a first power supply VCC is directly loaded to two ends of a lithium battery pack finished product 200 through a second resistor R4 of the small-current constant-current control circuit 2 to be charged and activated; of course, in practical implementation, the magnitude of the output current can be controlled by selecting the resistance value of the second resistor R4;
when a discharge activation test is carried out, an enable discharge activation control signal DIG-COM is sent to the low-current constant-current control circuit 2 through the main control circuit 1; after the small-current constant-current control circuit 2 receives an enable discharge activation control signal DIG-COM, enabling to control a third MOS tube Q3 in the small-current constant-current control circuit 2 to be conducted, further triggering a second optocoupler U2 in the small-current constant-current control circuit 2 to be conducted, and enabling two ends of a lithium battery pack finished product 200 to be directly connected to a third resistor R21 of the small-current constant-current control circuit 2 to be subjected to discharge activation; of course, in practical implementation, the magnitude of the output current can be controlled by selecting the resistance value of the third resistor R21.
In this embodiment, the test method further includes:
when overcurrent protection test is carried out after activation, a voltage output value V is set through the main control circuit 1setAnd the current output value IsetV can be set according to actual output requirementssetAnd IsetWill VsetAnd IsetThe signal is output to the constant voltage and constant current control circuit 4; the constant voltage and constant current control circuit 4 receives VsetAnd IsetAfter the signal, enabling to output a high level to drive a first MOS tube Q1 in the linear regulation control circuit 3 to be conducted, thereby outputting a voltage current value;
the voltage and current acquisition circuit 5 acquires voltage VFB and current IFB in a loop; the voltage and current acquisition circuit 5 feeds back the acquired current signals of the voltage VFB and the IFB to the constant voltage and constant current control circuit 4 in real time, so that the constant voltage and constant current control circuit 4 adjusts and drives the conduction degree of a first MOS transistor Q1 in the linear regulation control circuit 3, and the linear regulation control circuit 3 stably outputs a required voltage and current value; the voltage and current acquisition circuit 5 feeds back the acquired voltage VFB and current IFB signals to the main control circuit 1 in real time, so that the main control circuit 1 performs real-time monitoring processing (specifically, processing such as collection, monitoring and display can be performed).
In summary, the invention has the following advantages: two groups of circuits, namely a small current constant-current control circuit and a constant voltage constant-current control circuit, are designed to be used in a combined mode, the two groups of circuits of the constant voltage constant-current control circuit are started when the protection function of a finished lithium battery product is tested, and the small current constant-current control circuit is started when the charge and discharge function of the finished lithium battery product is tested; the small current constant current control circuit can directly enable the control output of the small current required by charging and discharging activation, so that the response speed is high, and the function of quickly responding and activating the charging and discharging of the finished lithium battery pack can be well met. Meanwhile, after the lithium battery pack finished product is activated, the protection function can be directly tested through the constant-voltage constant-current control circuit, so that the lithium battery pack is very convenient to use.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (9)
1. The utility model provides a test circuit that lithium cell group finished product charge and discharge activation which characterized in that: the device comprises a main control circuit, a small current constant current control circuit, a linear regulation control circuit, a constant voltage constant current control circuit and a voltage current acquisition circuit;
the small current constant current control circuit, the constant voltage constant current control circuit and the voltage current acquisition circuit are all connected with the main control circuit; the small current constant current control circuit is connected with the linear regulation control circuit; the voltage and current acquisition circuit is connected with the constant voltage and constant current control circuit; the constant voltage and constant current control circuit is connected with the linear regulation control circuit;
during testing, the linear regulation control circuit and the voltage and current acquisition circuit are connected with a finished lithium battery pack product;
when the lithium battery pack charging and discharging device works, the main control circuit enables to trigger the small-current constant-current control circuit to output small current, and the linear regulation control circuit is driven by the small-current enable to carry out charging and discharging activation on a lithium battery pack finished product; or the main control circuit enables to trigger the constant-voltage constant-current control circuit to output a high level, and the linear regulation control circuit is driven to output a voltage current value through the high level;
the voltage and current acquisition circuit acquires the voltage and current values on the loop in real time; the voltage and current acquisition circuit feeds back the acquired voltage and current values to the constant-voltage and constant-current control circuit so that the constant-voltage and constant-current control circuit adjusts the voltage and current output of the linear regulation control circuit; and the voltage and current acquisition circuit provides the acquired voltage and current values for the main control circuit to carry out real-time monitoring processing.
2. The test circuit for charging and discharging electrical activation of a lithium battery pack finished product according to claim 1, wherein: the constant voltage and constant current control circuit comprises a voltage operational amplifier, a current operational amplifier, a first diode and a second diode;
the positive input ends of the voltage operational amplifier and the current operational amplifier are connected with the main control circuit, and the negative input ends of the voltage operational amplifier and the current operational amplifier are connected with the voltage and current acquisition circuit; the output ends of the voltage operational amplifier and the current operational amplifier are connected with the linear regulation control circuit; the first diode is connected in parallel at the output end of the current operational amplifier, and the second diode is connected in parallel at the output end of the voltage operational amplifier.
3. The test circuit for charging and discharging electrical activation of a lithium battery pack finished product according to claim 1, wherein: the linear regulation control circuit comprises a first MOS tube and a first resistor;
the G pole of the first MOS tube is connected with the constant-voltage constant-current control circuit, and the D pole of the first MOS tube is connected with a first power supply; the S pole of the first MOS tube is respectively connected with the positive voltage sampling end of the voltage and current acquisition circuit and the positive voltage output end of the small current constant current control circuit; one end of the first resistor is connected with the negative voltage sampling end of the voltage and current acquisition circuit, the positive current sampling end of the voltage and current acquisition circuit and the negative voltage output end of the small current constant current control circuit respectively, and the other end of the first resistor is connected with the ground and the negative current sampling end of the voltage and current acquisition circuit respectively.
4. The test circuit for charging and discharging electrical activation of a lithium battery pack finished product according to claim 1, wherein: the voltage and current acquisition circuit comprises a voltage acquisition operational amplifier and a current acquisition operational amplifier;
the input end of the voltage acquisition operational amplifier is connected with the two voltage output ends of the linear regulation control circuit, and the output ends of the voltage acquisition operational amplifier are respectively connected with the main control circuit and the constant voltage and constant current control circuit;
the input end of the current acquisition operational amplifier is connected with the two current acquisition ends of the linear regulation control circuit, and the output end of the current acquisition operational amplifier is respectively connected with the main control circuit and the constant voltage and constant current control circuit.
5. The test circuit for charging and discharging electrical activation of a lithium battery pack finished product according to claim 1, wherein: the small current constant current control circuit comprises a first optical coupler, a second MOS (metal oxide semiconductor) tube, a third MOS tube, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor;
the end C of the first optical coupler is connected with a first power supply through the second resistor, the end A of the first optical coupler is connected with a second power supply through the fifth resistor, and the end K of the first optical coupler is connected with the pole D of the second MOS tube; the G pole of the second MOS tube is connected with the main control circuit, and the S pole of the second MOS tube is grounded;
the A end of the second optical coupler is connected with a second power supply through the sixth resistor, and the K end of the second optical coupler is connected with the D pole of the third MOS tube; the G pole of the third MOS tube is connected with the main control circuit, and the S pole of the third MOS tube is grounded;
the end E of the second optocoupler is connected with the negative voltage output end of the linear regulation control circuit through the third resistor; and a positive voltage output end of the linear regulation control circuit is respectively connected with the end E of the first optical coupler and the end A of the second optical coupler through the fourth resistor.
6. The test circuit for charging and discharging electrical activation of a lithium battery pack finished product according to claim 5, wherein: the second resistor and the third resistor are both adjustable resistors.
7. The test circuit for charging and discharging electrical activation of a lithium battery pack finished product according to claim 1, wherein: the main control circuit adopts a TMS320F28377S chip.
8. A test method for charge and discharge activation of a finished lithium battery pack is characterized by comprising the following steps: the test method requires the use of a test circuit according to any of claims 1 to 7; the test method comprises the following steps:
when a charging activation test is carried out, an enabling charging activation control signal is sent to the low-current constant-current control circuit through the main control circuit; after receiving an enabling charging activation control signal, the small-current constant-current control circuit enables a second MOS tube in the small-current constant-current control circuit to be controlled to be conducted, and then a first optical coupler in the small-current constant-current control circuit is triggered to be conducted, so that a first power supply VCC is directly loaded to two ends of a lithium battery pack finished product through a second resistor of the small-current constant-current control circuit to be charged and activated;
when a discharge activation test is carried out, an enabling discharge activation control signal is sent to the low-current constant-current control circuit through the main control circuit; and after receiving the enabling discharge activation control signal, the small-current constant-current control circuit enables to control the conduction of a third MOS (metal oxide semiconductor) tube in the small-current constant-current control circuit, and further triggers the conduction of a second optical coupler in the small-current constant-current control circuit, so that two ends of a finished lithium battery pack are directly connected to a third resistor of the small-current constant-current control circuit for discharge activation.
9. The method for testing charge and discharge activity of a lithium battery pack finished product according to claim 8, wherein the method comprises the following steps: the test method further comprises the following steps:
when overcurrent protection test is carried out after activation, a voltage output value V is set through the main control circuitsetAnd the current output value IsetWill VsetAnd IsetThe signal is output to the constant voltage and constant current control circuit; the constant voltage and constant current control circuit receives VsetAnd IsetAfter the signal is sent, enabling to output a high level to drive a first MOS tube in the linear regulation control circuit to be conducted, thereby outputting a voltage current value;
the voltage and current acquisition circuit acquires voltage VFB and current IFB in a loop; the voltage and current acquisition circuit feeds back acquired voltage VFB and IFB current signals to the constant-voltage and constant-current control circuit in real time so that the constant-voltage and constant-current control circuit adjusts and drives the conduction degree of a first MOS (metal oxide semiconductor) tube in the linear regulation control circuit, and the linear regulation control circuit stably outputs a required voltage and current value; and the voltage and current acquisition circuit feeds back acquired voltage VFB and current IFB signals to the main control circuit in real time so as to supply the main control circuit to perform real-time monitoring processing.
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