CN218995619U - Echelon utilization performance detection circuit of power lithium battery - Google Patents
Echelon utilization performance detection circuit of power lithium battery Download PDFInfo
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- CN218995619U CN218995619U CN202223096894.8U CN202223096894U CN218995619U CN 218995619 U CN218995619 U CN 218995619U CN 202223096894 U CN202223096894 U CN 202223096894U CN 218995619 U CN218995619 U CN 218995619U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model discloses a cascade utilization performance detection circuit of a power lithium battery, which is characterized in that a main control center completes battery detection through upper computer control, synchronously detects connection impedance of the battery, gives out single-cell voltage of the battery and impedance value of an external connection bus of the battery, an MCU chip judges whether the battery voltage and the connection impedance are normal or not through reference values, three parameters of total internal resistance of a battery pack of the power lithium battery, single-cell voltage and single-cell internal resistance of the power lithium battery can be intuitively detected through internal resistance test, single-cell voltage detection and single-cell internal resistance Chi Nazu detection, and the performance of the selected battery can be judged through the three parameters to carry out cascade classification treatment, so that the power lithium battery is fully, safely and reliably recycled, and high waste of resources is avoided.
Description
Technical Field
The utility model belongs to the technical field of battery manufacturing in the new energy automobile industry, and particularly relates to a gradient utilization performance detection circuit of a power lithium battery.
Background
The core technology of the new energy automobile industry is a battery energy storage technology; after the battery pack of the new energy automobile is used for a long time, the charge capacity of the battery pack is gradually reduced, and the battery pack is not suitable for being used as the battery pack of the automobile when the charge capacity of the battery pack is reduced to about 80% of the initial capacity; however, if the battery which is not suitable for being used as the automobile battery pack is directly scrapped, high waste of resources can be caused; under the conditions that the shell is complete and all functional elements can be normally used, the battery can be recycled in a grading way according to the performance of the battery, namely, the battery can be recycled in a grading way. Therefore, it is necessary to perform detection and analysis from the performance such as the balance, the internal resistance matching, and the battery connection reliability, so that the performance state of the power lithium battery can be determined, so that the power lithium battery can be fully, safely and reliably recycled.
In the prior art, a circuit device capable of realizing the detection of the internal resistance of a power lithium battery, the detection of the voltage of a single battery and the detection of the voltage of the single battery Chi Nazu is lacked, so that the performance of the battery is judged through three parameters of the total internal resistance of a battery pack, the voltage of the single battery and the internal resistance of the single battery.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model aims to provide a gradient utilization performance detection circuit of a power lithium battery, which can intuitively detect three parameters of the total internal resistance of a battery pack of the power lithium battery, the voltage of a single battery and the internal resistance of the single battery, so as to judge the performance of the battery and realize gradient utilization of the power lithium battery.
The technical scheme adopted by the utility model is as follows:
the echelon utilization performance detection circuit of the power lithium battery comprises a main control center, a sampling module, a battery internal resistance detection module, a battery voltage detection module and a single battery impedance detection module; the battery internal resistance detection module and the single battery impedance detection module are connected to the main control center, and the battery voltage detection module is connected to the main control center through the sampling module;
the battery internal resistance detection module is used for detecting the total internal resistance of the battery pack;
the battery voltage detection module is used for detecting the voltage of a single battery of each battery in the battery pack;
the single-battery impedance detection module is used for detecting a single battery Chi Nazu of each battery in the battery pack;
the main control center is used for receiving detection data of the battery internal resistance detection module, the battery voltage detection module and the single battery impedance detection module, and comparing and judging according to a preset reference value.
Further, the main control center adopts an MCU chip; the battery internal resistance detection module comprises a first internal resistance detection operational amplifier, a second internal resistance detection operational amplifier and a third internal resistance detection operational amplifier; the output end disc_isense of the first internal resistance detection operational amplifier is connected to a 25-pin PA2 port of the MCU chip, two input ends of the first internal resistance detection operational amplifier are connected to the output end of the second internal resistance detection operational amplifier, the input end of the second internal resistance detection operational amplifier is connected to the battery pack, and the output end of the second internal resistance detection operational amplifier is also connected to the battery pack; the third internal resistance detection operational amplifier is a comparator.
Further, the disc_pwm signal output end of the MCU chip is connected to the output end of the second internal resistance detection operational amplifier through a control signal unit;
the control signal unit comprises a pre-bias triode.
Further, two input ends of the first internal resistance detection operational amplifier are connected to a connection point of an output end of the second internal resistance detection operational amplifier and the control signal unit through the current sampling unit, so that the first internal resistance detection operational amplifier forms a current signal feedback unit;
the current sampling unit comprises a plurality of current sampling resistors which are arranged in parallel.
Further, the output end of the second internal resistance detection operational amplifier is connected to the battery pack through a discharge load resistor; the discharging load resistor comprises two power resistors.
Further, the output end of the second internal resistance detection operational amplifier is connected with two discharge switches, one of the discharge switches is connected between the connection point of the output end of the second internal resistance detection operational amplifier and the control signal unit and the discharge load resistor, and the other discharge switch is connected between the connection point of the output end of the second internal resistance detection operational amplifier and the control signal unit and the current sampling unit.
Further, the sampling module comprises one or more ADC analog-to-digital converters, and each battery in the battery pack is connected to one sampling signal input port of each ADC analog-to-digital converter through a battery voltage detection module;
the signal control pins of the MCU chip are respectively connected to the signal control ports of each ADC analog-to-digital converter.
Still further, the battery voltage detection module comprises a plurality of groups of battery voltage detection circuits, and each group of battery voltage detection circuits is respectively provided with a plurality of battery voltage sampling units;
each battery voltage sampling unit comprises a first voltage sampling amplifier, a second voltage sampling amplifier and a third voltage sampling amplifier; the non-inverting input end of the first voltage sample amplifier and the non-inverting input end of the second voltage sample amplifier of each battery voltage sampling unit are connected to the single battery; the inverting input end and the output end of the first voltage sampling amplifier are connected to the inverting input end of the third voltage sampling amplifier; the inverting input end and the output end of the second voltage sampling amplifier are connected to the non-inverting input end of the third voltage sampling amplifier;
the first voltage sampling amplifier, the second voltage sampling amplifier and the third voltage sampling amplifier of each battery voltage sampling unit all adopt SGM8274 low-power-consumption operational amplifiers.
Still further, the single-battery impedance detection module includes a plurality of groups of single-battery impedance detection circuits, each group of single-battery impedance detection circuits is respectively provided with a plurality of single-battery impedance sampling units, each single-battery impedance sampling unit respectively includes a transistor BCX56 and a semiconductor triode, the base electrode of the semiconductor triode MJD42C is connected to the collector electrode of the transistor BCX56, and the emitter and collector electrodes of the semiconductor triode MJD42C are connected to the battery circuit; the base electrode of the transistor BCX56 is connected to the performance test ports DISC_1-24 of the MCU chip; the emitter of transistor BCX56 is grounded.
Finally, the main control center is also connected with a display terminal, an operation terminal and a communication module;
the display terminal adopts a display screen and is used for displaying system parameters;
the operation terminal adopts an operation key for inputting detection parameters and control instructions;
the communication module adopts CAN/RS485 communication and is used for communication connection with the user terminal.
The beneficial effects of the utility model are as follows:
the utility model provides a echelon utilization performance detection circuit of power lithium cell, the main control center accomplishes the battery through the upper computer control and detects the connection impedance of battery in step, give battery single-section voltage and battery external connection winding displacement impedance value, MCU chip judges battery voltage and connection impedance through consulting the benchmark value whether normal, through internal resistance test, single-section voltage detection and single-section Chi Nazu detection, can directly perceivedly detect the battery package total internal resistance of power lithium cell, single-section battery voltage and single-section battery internal resistance three parameters, judge through three parameters and select the battery performance, carry out the classification processing of stepping, realize the echelon utilization of power lithium cell, thereby fully, safe, reliably recycle power lithium cell, avoid the high waste of resource.
Drawings
FIG. 1 is a schematic diagram of a cascade utilization performance detection circuit of a power lithium battery according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an MCU chip of a master control center of a cascade utilization performance detection circuit of a power lithium battery according to an embodiment of the present utility model;
fig. 3 to fig. 4 are schematic diagrams of auxiliary connection circuits of a cascade utilization performance detection circuit of a power lithium battery according to an embodiment of the present utility model;
fig. 5 is a schematic diagram of a battery internal resistance detection module of a cascade utilization performance detection circuit of a power lithium battery according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a sampling module of a testing circuit for testing the cascade utilization performance of a lithium battery according to an embodiment of the utility model;
FIG. 7 is a schematic diagram of a battery voltage detection module of a cascade utilization performance detection circuit of a lithium-ion power battery according to an embodiment of the present utility model;
fig. 8 is a schematic diagram of a single battery impedance detection module of a cascade utilization performance detection circuit of a power lithium battery according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art without the inventive effort, are intended to be within the scope of the present utility model.
As shown in fig. 1 to 8, the utility model provides a gradient utilization performance detection circuit of a power lithium battery, and the overall planning scheme is as follows: the method comprises the steps of setting a main control center, a sampling module, a battery internal resistance detection module, a battery voltage detection module and a single battery impedance detection module; the battery internal resistance detection module and the single battery impedance detection module are connected to the main control center, and the battery voltage detection module is connected to the main control center through the sampling module;
the battery internal resistance detection module is used for detecting the total internal resistance of the battery pack;
the battery voltage detection module is used for detecting the voltage of a single battery of each battery in the battery pack;
the single-battery impedance detection module is used for detecting a single battery Chi Nazu of each battery in the battery pack;
the main control center is used for receiving detection data of the battery internal resistance detection module, the battery voltage detection module and the single battery impedance detection module, and comparing and judging according to a preset reference value.
The main control center can be separately provided with the MCU chip and then is connected to the upper computer of the user terminal in a communication way, or the corresponding functional module is directly arranged by the control chip of the upper computer.
The main control center completes battery detection through upper computer control, synchronously detects the connection impedance of the battery, gives out the single-section voltage of the battery and the impedance value of the external connection flat cable of the battery, and the MCU chip judges whether the battery voltage and the connection impedance are normal or not through reference values, and through internal resistance test, single-section voltage detection and single-section Chi Nazu detection, three parameters of the total internal resistance of a battery pack of the power lithium battery, single-section voltage and single-section internal resistance of the power lithium battery can be intuitively detected, the performance of the selected battery is judged and selected through the three parameters, and grading and classification treatment is carried out, so that the cascade utilization of the power lithium battery is realized, and therefore, the power lithium battery is fully, safely and reliably recycled, and the high waste of resources is avoided.
Further, the main control center adopts an MCU chip; the battery internal resistance detection module comprises a first internal resistance detection operational amplifier, a second internal resistance detection operational amplifier and a third internal resistance detection operational amplifier; the output end disc_isense of the first internal resistance detection operational amplifier is connected to a 25-pin PA2 port of the MCU chip, two input ends of the first internal resistance detection operational amplifier are connected to the output end of the second internal resistance detection operational amplifier, the input end of the second internal resistance detection operational amplifier is connected to the battery pack, and the output end of the second internal resistance detection operational amplifier is also connected to the battery pack; the third internal resistance detection operational amplifier is a comparator.
Further, the disc_pwm signal output end of the MCU chip is connected to the output end of the second internal resistance detection operational amplifier through a control signal unit;
the control signal unit comprises a pre-bias triode.
Further, two input ends of the first internal resistance detection operational amplifier are connected to a connection point of an output end of the second internal resistance detection operational amplifier and the control signal unit through the current sampling unit, so that the first internal resistance detection operational amplifier forms a current signal feedback unit;
the current sampling unit comprises a plurality of current sampling resistors which are arranged in parallel.
Further, the output end of the second internal resistance detection operational amplifier is connected to the battery pack through a discharge load resistor; the discharging load resistor comprises two power resistors.
Further, the output end of the second internal resistance detection operational amplifier is connected with two discharge switches, one of which is connected between the connection point of the output end of the second internal resistance detection operational amplifier and the control signal unit and the discharge load resistor, and the other of which is connected between the connection point of the output end of the second internal resistance detection operational amplifier and the control signal unit and the current sampling unit.
Further, the sampling module comprises one or more ADC analog-to-digital converters, and each battery in the battery pack is connected to one sampling signal input port of each ADC analog-to-digital converter through the battery voltage detection module;
the signal control pins of the MCU chip are respectively connected to the signal control ports of each ADC analog-to-digital converter.
Still further, the battery voltage detection module comprises a plurality of groups of battery voltage detection circuits, and each group of battery voltage detection circuits is respectively provided with a plurality of battery voltage sampling units;
each battery voltage sampling unit comprises a first voltage sampling amplifier, a second voltage sampling amplifier and a third voltage sampling amplifier; the non-inverting input end of the first voltage sample amplifier and the non-inverting input end of the second voltage sample amplifier of each battery voltage sampling unit are connected to the single battery; the inverting input end and the output end of the first voltage sampling amplifier are connected to the inverting input end of the third voltage sampling amplifier; the inverting input end and the output end of the second voltage sampling amplifier are connected to the non-inverting input end of the third voltage sampling amplifier;
the first voltage sampling amplifier, the second voltage sampling amplifier and the third voltage sampling amplifier of each battery voltage sampling unit all adopt SGM8274 low-power-consumption operational amplifiers.
Still further, the single battery impedance detection module includes a plurality of groups of single battery impedance detection circuits, each group of single battery impedance detection circuits is respectively provided with a plurality of single battery impedance sampling units, each single battery impedance sampling unit includes a transistor BCX56 and a semiconductor transistor, the base electrode of the semiconductor transistor MJD42C is connected to the collector electrode of the transistor BCX56, and the emitter and collector electrodes of the semiconductor transistor MJD42C are connected to the battery circuit; the base electrode of the transistor BCX56 is connected to the performance test ports DISC_1-24 of the MCU chip; the emitter of transistor BCX56 is grounded.
Finally, the main control center is also connected with a display terminal, an operation terminal and a communication module;
the display terminal adopts a display screen and is used for displaying system parameters;
the operation terminal adopts an operation key for inputting detection parameters and control instructions;
the communication module adopts CAN/RS485 communication and is used for communication connection with the user terminal.
In the first embodiment, the master control center is provided with an MCU chip.
The battery pack is provided with four battery packs, each battery pack is provided with six single batteries BAT 1-BAT 24, the battery pack is provided with twenty-four single batteries, and the batteries are connected in series through a diode interval to form a battery loop.
The battery internal resistance detection module is provided with a first internal resistance detection operational amplifier U37-A, a second internal resistance detection operational amplifier U37-B and a third internal resistance detection operational amplifier U37-C, wherein the first internal resistance detection operational amplifier U37-A, the second internal resistance detection operational amplifier U37-B and the third internal resistance detection operational amplifier U37-C all adopt SGM8270-2XMS8G/TR low-noise operational amplifiers;
the output end disc_isense of the first internal resistance detection operational amplifier is connected to a 25-pin PA2 port of the MCU chip, two input ends of the first internal resistance detection operational amplifier are connected to the output end of the second internal resistance detection operational amplifier, the input end of the second internal resistance detection operational amplifier is connected to the battery pack, and the output end of the second internal resistance detection operational amplifier is also connected to the battery pack; the third internal resistance detection operational amplifier is a comparator. The disc_pwm signal output end of the MCU chip is connected to the output end of the second internal resistance detection operational amplifier through a control signal unit.
The main structure of the control signal unit adopts a Q53 pre-bias triode DTC114T.
The two input ends of the first internal resistance detection operational amplifier are connected to the connection point of the output end of the second internal resistance detection operational amplifier and the control signal unit through the current sampling unit, so that the first internal resistance detection operational amplifier forms a current signal feedback unit;
the current sampling unit is provided with a plurality of parallel current sampling resistors R265, R321, R322 and R320.
The output end of the second internal resistance detection operational amplifier is connected to the battery pack through a discharge load resistor; the discharging load resistor is provided with two power resistors P4 and P5, and the two power resistors P4 and P5 are connected with 5R/100W power resistors.
The output end of the second internal resistance detection operational amplifier is connected with two discharging switches Q37N-MOS and Q52N-MOS, one discharging switch is connected between the connection point of the output end of the second internal resistance detection operational amplifier and the control signal unit and the discharging load resistor, and the other discharging switch is connected between the connection point of the output end of the second internal resistance detection operational amplifier and the control signal unit and the current sampling unit.
The battery voltage detection module is provided with twenty-four single-battery voltage detection units, and each single-battery voltage detection unit is connected to one single battery respectively.
The sampling module is provided with a first ADC analog-to-digital converter U19 TLC25781, a second ADC analog-to-digital converter U20 TLC25781 and a third ADC analog-to-digital converter U21 TLC25781, wherein the total number of the ADC analog-to-digital converters is three, and eight signal input ports of each ADC analog-to-digital converter are respectively connected to eight single batteries of the battery pack; therefore, the voltage of the single battery of twenty-four single batteries of the four battery packs in the battery pack can be detected through three ADC analog-digital converters.
Twenty-four batteries BAT1 to BAT24 in the battery pack are respectively connected to twenty-four sampling signal input ports CELL11 to CELL24 of the three ADC analog-to-digital converters through battery voltage detection modules.
The signal control pins START 1-START 3, FS 1-FS 3 and ADC_INT13 of the MCU chip are respectively connected to the signal control port of each ADC analog-digital converter.
The battery voltage detection module is provided with four groups of battery voltage detection circuits, each group of battery voltage detection circuits is provided with six battery voltage sampling units respectively, twenty-four battery voltage sampling units are totally arranged, and the twenty-four battery voltage sampling units are connected to three ADC analog-to-digital converters through twenty-four sampling signal input ports CELL 11-CELL 24.
As shown, a first battery voltage sampling unit of a first battery BAT1 is provided with a first voltage sampling amplifier U1-a, a second voltage sampling amplifier U1-B, and a third voltage sampling amplifier U1-C; the non-inverting input end of the first voltage sample amplifier U1-A and the non-inverting input end of the second voltage sample amplifier U1-B of the first battery voltage sampling unit are connected to the single battery; the inverting input end and the output end of the first voltage sampling amplifier U1-A are connected to the inverting input end of the third voltage sampling amplifier U1-C; the inverting input end and the output end of the second voltage sampling amplifier U1-B are connected to the non-inverting input end of the third voltage sampling amplifier U1-C; similarly, twenty-four batteries BAT1 to BAT25 each have the same structure as the first battery voltage sampling unit of the first battery BAT 1.
The first voltage sampling amplifier, the second voltage sampling amplifier and the third voltage sampling amplifier of all the battery voltage sampling units adopt SGM8274 low-power-consumption operational amplifiers.
The single-battery impedance detection module is provided with four groups of single-battery impedance detection circuits, and each group of single-battery impedance detection circuits is provided with six single-battery impedance sampling units respectively;
the first single-battery impedance sampling unit of the first battery BAT1 is provided with a first transistor Q46 and a first semiconductor transistor Q42, the base electrode of the first semiconductor transistor is connected to the collector electrode of the first transistor, and the emitter electrode and the collector electrode of the first semiconductor transistor are connected to a battery loop; the base electrode of the first transistor is connected to a performance test port disc_1 of the MCU chip; the emitter of the first transistor is grounded.
All transistors use BCX56 and all semiconductor transistors use MJD42C.
The bases of twenty-four transistors BCX56 are connected to performance test ports disc_1-disc_24 of the MCU chip.
The echelon utilization performance detection circuit of the power lithium battery can meet the requirement of 1-24S LiPo\LiFe\LiHV, and mainly realizes balance degree analysis of battery pack performance, internal resistance matching degree analysis and battery connection reliability analysis. The battery analysis core mainly comprises a battery analysis core, information display and user operation interaction. The battery analysis core mainly realizes the analysis of the performance of the battery pack and mainly comprises the analysis of balance degree, internal resistance matching degree, battery connection reliability and the like; the information display module is mainly used for finishing the display of user setting information, the display of battery analysis results, the display of external environments and the like; the user operation may accept a touch operation and an upper computer operation.
1> test of internal resistance of battery: the product circuit detects that the battery is qualified in self-checking after being connected, enters a standby state, and can start the battery internal resistance detection circuit to finish the detection of the battery internal resistance through the control of an operation key or an upper computer, the data of the battery internal resistance test result is displayed on a display screen, the MCU can judge whether the battery internal resistance is normal or not through a reference value, and the judgment result can be displayed on the screen.
2> battery cell testing:
the product circuit detects that the battery is qualified after self-checking after being connected, and then enters a standby state, and through the control of an operation key or an upper computer, the battery single-battery voltage detection circuit can be started to finish battery detection, in the test process, the connection impedance of the battery can be synchronously detected, the single-battery voltage and the external connection flat cable impedance value of the battery are given, the test result data are displayed on a display screen, the MCU can judge whether the battery voltage and the connection impedance are normal or not through a reference value, and the judgment result can be given and displayed on the screen.
Different reference parameter values can be set for the product, and the performance of the selected battery is judged by three parameters, namely an internal resistance test, a single-battery voltage detection value, a single-battery voltage Chi Nazu value and the like, and the grading and classification treatment is carried out, so that the gradient utilization of the battery is completed.
The power supply filter capacitor is close to the IC; the analog sampling portion is as short as possible with few vias. The digital signal is less stringent between the op-amp and ADC sampling. The heat generating part needs to be separated from the signal part, so that the influence of heat on the ADC is avoided.
The impedance detection module part of the circuit of the single battery generates heat, is far away from the ADC and needs to be thermally isolated.
The utility model is not limited to the above-described alternative embodiments, and any person who may derive other various forms of products in the light of the present utility model, however, any changes in shape or structure thereof, all falling within the technical solutions defined in the scope of the claims of the present utility model, fall within the scope of protection of the present utility model.
Claims (10)
1. The utility model provides a echelon utilization performance detection circuit of power lithium cell which characterized in that: the device comprises a main control center, a sampling module, a battery internal resistance detection module, a battery voltage detection module and a single battery impedance detection module; the battery internal resistance detection module and the single battery impedance detection module are connected to the main control center, and the battery voltage detection module is connected to the main control center through the sampling module;
the battery internal resistance detection module is used for detecting the total internal resistance of the battery pack;
the battery voltage detection module is used for detecting the voltage of a single battery of each battery in the battery pack;
the single-battery impedance detection module is used for detecting a single battery Chi Nazu of each battery in the battery pack;
the main control center is used for receiving detection data of the battery internal resistance detection module, the battery voltage detection module and the single battery impedance detection module, and comparing and judging according to a preset reference value.
2. The cascade utilization performance detection circuit of a power lithium battery according to claim 1, wherein: the main control center adopts an MCU chip; the battery internal resistance detection module comprises a first internal resistance detection operational amplifier, a second internal resistance detection operational amplifier and a third internal resistance detection operational amplifier; the output end disc_isense of the first internal resistance detection operational amplifier is connected to a 25-pin PA2 port of the MCU chip, two input ends of the first internal resistance detection operational amplifier are connected to the output end of the second internal resistance detection operational amplifier, the input end of the second internal resistance detection operational amplifier is connected to the battery pack, and the output end of the second internal resistance detection operational amplifier is also connected to the battery pack; the third internal resistance detection operational amplifier is a comparator.
3. The cascade utilization performance detection circuit of a power lithium battery according to claim 2, wherein: the disc_pwm signal output end of the MCU chip is connected to the output end of the second internal resistance detection operational amplifier through a control signal unit;
the control signal unit comprises a pre-bias triode.
4. The cascade utilization performance detection circuit of a power lithium battery according to claim 3, wherein: the two input ends of the first internal resistance detection operational amplifier are connected to the connection point of the output end of the second internal resistance detection operational amplifier and the control signal unit through the current sampling unit, so that the first internal resistance detection operational amplifier forms a current signal feedback unit;
the current sampling unit comprises a plurality of current sampling resistors which are arranged in parallel.
5. The cascade utilization performance detection circuit of a power lithium battery according to claim 3, wherein: the output end of the second internal resistance detection operational amplifier is connected to the battery pack through a discharge load resistor; the discharging load resistor comprises two power resistors.
6. The cascade utilization performance detection circuit of a power lithium battery according to claim 3, wherein: the output end of the second internal resistance detection operational amplifier is connected with two discharge switches, one of which is connected between the connection point of the output end of the second internal resistance detection operational amplifier and the control signal unit and the discharge load resistor, and the other of which is connected between the connection point of the output end of the second internal resistance detection operational amplifier and the control signal unit and the current sampling unit.
7. The cascade utilization performance detection circuit of a power lithium battery according to claim 2, wherein: the sampling module comprises one or more ADC analog-to-digital converters, and each battery in the battery pack is connected to a sampling signal input port of each ADC analog-to-digital converter through a battery voltage detection module;
the signal control pins of the MCU chip are respectively connected to the signal control ports of each ADC analog-to-digital converter.
8. The cascade utilization performance detection circuit of a power lithium battery according to claim 1, wherein: the battery voltage detection module comprises a plurality of groups of battery voltage detection circuits, and each group of battery voltage detection circuits is provided with a plurality of battery voltage sampling units respectively;
each battery voltage sampling unit comprises a first voltage sampling amplifier, a second voltage sampling amplifier and a third voltage sampling amplifier; the non-inverting input end of the first voltage sample amplifier and the non-inverting input end of the second voltage sample amplifier of each battery voltage sampling unit are connected to the single battery; the inverting input end and the output end of the first voltage sampling amplifier are connected to the inverting input end of the third voltage sampling amplifier; the inverting input end and the output end of the second voltage sampling amplifier are connected to the non-inverting input end of the third voltage sampling amplifier;
the first voltage sampling amplifier, the second voltage sampling amplifier and the third voltage sampling amplifier of each battery voltage sampling unit all adopt SGM8274 low-power-consumption operational amplifiers.
9. The cascade utilization performance detection circuit of a power lithium battery according to claim 1, wherein: the single-battery impedance detection module comprises a plurality of groups of single-battery impedance detection circuits, each group of single-battery impedance detection circuits is provided with a plurality of single-battery impedance sampling units, each single-battery impedance sampling unit comprises a transistor BCX56 and a semiconductor triode, the base electrode of the semiconductor triode MJD42C is connected to the collector electrode of the transistor BCX56, and the emitter and the collector electrode of the semiconductor triode MJD42C are connected to a battery loop; the base electrode of the transistor BCX56 is connected to the performance test ports DISC_1-24 of the MCU chip; the emitter of transistor BCX56 is grounded.
10. The cascade utilization performance detection circuit of a power lithium battery according to claim 1, wherein: the main control center is also connected with a display terminal, an operation terminal and a communication module;
the display terminal adopts a display screen and is used for displaying system parameters;
the operation terminal adopts an operation key for inputting detection parameters and control instructions;
the communication module adopts CAN/RS485 communication and is used for communication connection with the user terminal.
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