CN219142950U

CN219142950U - Microcurrent circuit for detecting energy storage BMS (battery management system) products

Info

Publication number: CN219142950U
Application number: CN202223233544.1U
Authority: CN
Inventors: 蓝仁朗; 谢志强; 刘启辉
Original assignee: Shenzhen Rui Energy Technology Co ltd
Current assignee: Shenzhen Rui Energy Technology Co ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-06-06
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses a micro-current circuit for detecting an energy storage BMS product, which comprises the following components: the device comprises a 12V power supply, a 5V power supply circuit, a sampling resistor circuit, a 3.3V power supply circuit, a switch control circuit, an energy storage BMS protection board, a conversion circuit, a main control circuit and a touch display screen; the corresponding ends of the 12V power supply, the 5V power supply module, the sampling resistor circuit, the 3.3V power supply circuit, the switch control circuit and the energy storage BMS protection board are electrically connected in sequence; the corresponding ends of the sampling resistor circuit are electrically connected with the corresponding ends of the conversion circuit, the main control circuit and the touch display screen in sequence; the conversion circuit comprises an inverting operational amplifier circuit, an adder circuit and a follower circuit which are electrically connected in sequence. The utility model discloses a method for rapidly, accurately and batchwise testing low-power consumption micro-current on a production line in the batch production link of energy storage BMS products.

Description

Microcurrent circuit for detecting energy storage BMS (battery management system) products

Technical Field

The utility model relates to the technical field of energy storage BMS product detection, in particular to a micro-current circuit for energy storage BMS product detection.

Background

At present, requirements on energy conservation and low power consumption of electronic products are higher and higher, and manufacturers generally have strict power consumption measurement methods and regulations, so that energy conservation of products, such as energy storage, electric vehicles, unmanned aerial vehicles, mobile phones, bluetooth headphones and other electronic products with batteries, are marked at remarkable positions. However, for the energy storage BMS product, the whole power consumption of a BMS board is easy to measure, if the sleep power consumption of the board is measured, the sleep power consumption of the BMS master control singlechip is required to be known, and the master control singlechip is a core component of the energy storage BMS board, so that the sleep power consumption of the BMS master control singlechip is required to be independently tested, and therefore, an electronic equipment manufacturer needs basic test equipment to measure the sleep power consumption of the board in the product development process, thereby being beneficial to the improvement design of research and development personnel, and also being capable of judging whether the products produced by batch processing are qualified according to the size of judging the sleep power consumption. The existing BMS test is carried out by using a protection board tester, and the protection board tester can only test basic functions such as overcharge, overdischarge, overcurrent and balance, and some test instruments can not test the sleep power consumption of a BMS main board, so that some BMS board factories are not used for testing the sleep power consumption of the main board.

The method has the advantages that the power consumption of the power supply voltage consumption is calculated manually, so that the first-stage measurement is obtained, the total power consumption of the BMS protection board is obtained after addition, the voltage of each resistor on the voltage line of the power supply without the stage is measured manually by using a universal meter, the precision requirement on the voltage is high (millivolt level), the precision requirement on the universal meter is high, the price of the high-precision universal meter is high, and the testing cost is high; meanwhile, because human errors and errors caused by process welding are easily caused by manual participation in measurement, the test result is inaccurate; in addition, it is also necessary to record and calculate the power consumption of several stages of power sources and the total power consumption of the BMS protection board, which is inconvenient and has high labor cost. Meanwhile, because the electricity taking modes of the BMS protection plates are more, the combination modes of the input and output interfaces of the existing power consumption test plate cannot meet the requirements of all BMS protection plate electricity taking combination modes, and power consumption measurement cannot be performed on some power supplies. The present technology has been developed in order to achieve the above object.

Disclosure of Invention

Aiming at the problems existing in the prior art, the utility model provides a micro-current circuit for detecting an energy storage BMS product.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

a microcurrent circuit for energy storage BMS product detection, comprising: the device comprises a 12V power supply, a 5V power supply circuit, a sampling resistor circuit, a 3.3V power supply circuit, a switch control circuit, an energy storage BMS protection board, a conversion circuit, a main control circuit and a touch display screen;

the corresponding ends of the 12V power supply, the 5V power supply module, the sampling resistor circuit, the 3.3V power supply circuit, the switch control circuit and the energy storage BMS protection board are electrically connected in sequence;

the corresponding ends of the sampling resistor circuit are electrically connected with the corresponding ends of the conversion circuit, the main control circuit and the touch display screen in sequence;

the conversion circuit comprises an inverting operational amplifier circuit, an adder circuit and a follower circuit which are electrically connected in sequence; the corresponding ends of the sampling resistor circuit are respectively and electrically connected with the corresponding ends of the inverting operational amplifier circuit and the adder circuit; the corresponding end of the follower circuit is also electrically connected with the corresponding end of the main control circuit.

Preferably, the main control circuit comprises an MCU singlechip.

Preferably, the 5V power supply circuit comprises a capacitor C3, a voltage stabilizing chip U4 and a capacitor C4; the 2 nd end of the voltage stabilizing chip U4 is electrically connected with one end of the capacitor C3 and the power end of the 12V power supply respectively, the 3 rd end of the voltage stabilizing chip U4 is electrically connected with one end of the capacitor C4 and the corresponding end of the sampling resistor circuit respectively, and the 1 st end of the voltage stabilizing chip U4 is grounded; the other end of the capacitor C3 is grounded, and the other end of the capacitor C4 is grounded; the chip model of the voltage stabilizing chip U4 is HT7550-1, and is used for stabilizing the 12 power supply to 5V to supply power to the circuit.

Preferably, the sampling resistor circuit includes a sampling resistor R9, and the corresponding ends of the sampling resistor R9 are electrically connected with the 3 rd end of the voltage stabilizing chip U4, the inverting operational amplifier circuit, the adder circuit, and the corresponding ends of the 3.3V power supply circuit, respectively.

Preferably, the 3.3V power supply circuit comprises a capacitor C5, a capacitor C6 and a voltage stabilizing chip U5; the 2 nd end of the voltage stabilizing chip U5 is electrically connected with one end of the capacitor C5 and the corresponding end of the sampling resistor R9 respectively, the 3 rd end of the voltage stabilizing chip U5 is electrically connected with one end of the capacitor C6 and the corresponding end of the switch control circuit respectively, and the 1 st end of the voltage stabilizing chip U5 is grounded; the other end of the capacitor C5 is grounded, and the other end of the capacitor C6 is grounded; the chip model of the voltage stabilizing chip U5 is BL9153-3.3V.

Preferably, the switch control circuit comprises a switch SW1, a resistor R10, a resistor R12, a resistor R13, a triode Q1 and a triode Q2; the E end of the triode Q1 is respectively and electrically connected with the 3 rd end of the voltage stabilizing chip U5, one end of the switch SW1 and one end of the resistor R10; the C end of triode Q1 and the other end electric connection of switch SW1, the B end of triode Q1 and the resistance R10 other end, resistance R11 one end electric connection, the resistance R11 other end and the C end electric connection of triode Q2, the B end of triode Q2 respectively with resistance R12 one end, resistance R13 one end electric connection, the E end of triode Q2 and resistance R13 other end electric connection and ground connection.

Preferably, the inverting operational amplifier circuit comprises a resistor R1, a resistor R4, a resistor R7, a capacitor C1 and an operational amplifier chip U1; the 2 nd end of the operational amplifier chip U1 is electrically connected with one end of a resistor R1, one end of a capacitor C1 and one end of a resistor R4 respectively, the 3 rd end of the operational amplifier chip U1 is grounded through a resistor R7 respectively, and the 1 st end of the operational amplifier chip U1 is electrically connected with the other end of the resistor R1, the other end of the capacitor C1 and the corresponding end of an adder circuit respectively; the other end of the resistor R4 is electrically connected with the corresponding end of the sampling resistor R9.

Preferably, the adder circuit comprises a resistor R5, a resistor R3, an operational amplifier chip U3, a resistor R2, a capacitor C2 and a resistor R8; the 6 th end of the operational amplifier chip U1 is electrically connected with one end of a resistor R5, a resistor R3, a resistor R2 and a capacitor C2 respectively, the 5 th end of the operational amplifier chip U1 is grounded through a resistor R8, the 7 th end of the operational amplifier chip U1 is electrically connected with the other end of the resistor R2, the other end of the capacitor C2 and the corresponding end of the follower circuit respectively, and the other end of the resistor R3 is correspondingly electrically connected with the corresponding end of a sampling resistor R9.

Preferably, the follower circuit comprises an operational amplifier chip U2 and a resistor R6; the 3 rd end of the operational amplifier chip U2 is electrically connected with the 7 th end of the operational amplifier chip U3, the 2 nd end of the operational amplifier chip U2 is electrically connected with the 1 st end of the operational amplifier chip U2 and one end of the resistor R6 respectively, and the other end of the resistor R6 is electrically connected with the corresponding end of the MCU singlechip.

The technical scheme of the utility model has the following beneficial effects: the low-power consumption micro-current on the production line is rapidly, accurately and in batch tested in the batch production link of the energy storage BMS product, the test system is good in operation, simple in operation and small in measurement error, the batch production requirement of a factory can be met, human-computer interaction is better realized by the touch color screen, the operation of testers is facilitated, and the energy storage BMS product has a wide market application prospect.

Drawings

FIG. 1 is a schematic diagram of a circuit control diagram of the present utility model;

FIG. 2 is a schematic circuit diagram of the present utility model;

FIG. 3 is a schematic diagram of an entire test circuit according to the present utility model.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, a first feature is "on" or "to a second feature unless explicitly specified and defined otherwise

"under" may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact by another feature therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Referring to fig. 1 to 2, the present utility model provides a micro-current circuit for energy storage BMS product detection, comprising: a 12V power supply 100, a 5V power supply circuit 200, a sampling resistor circuit 300, a 3.3V power supply circuit 400, a switch control circuit 500, an energy storage BMS protection board 600, a conversion circuit 700, a main control circuit 800 and a touch display screen 900;

the corresponding ends of the 12V power supply 100, the 5V power supply module 200, the sampling resistor circuit 300, the 3.3V power supply circuit 400, the switch control circuit 500 and the energy storage BMS protection board 600 are electrically connected in sequence;

the corresponding ends of the sampling resistor circuit 300 are electrically connected with the corresponding ends of the conversion circuit 700, the main control circuit 800 and the touch display screen 900 in sequence;

the conversion circuit 700 includes an inverting operational amplifier circuit 701, an adder circuit 702, and a follower circuit 703 electrically connected in sequence; the corresponding ends of the sampling resistor circuit 300 are respectively and electrically connected with the corresponding ends of the inverting operational amplifier circuit 701 and the adder circuit 702; the corresponding end of the follower circuit 703 is also electrically connected to the corresponding end of the master circuit 800. The master control circuit 800 comprises an MCU singlechip.

The 5V power supply circuit 200 comprises a capacitor C3, a voltage stabilizing chip U4 and a capacitor C4; the 2 nd end of the voltage stabilizing chip U4 is electrically connected with one end of the capacitor C3 and the power end of the 12V power supply respectively, the 3 rd end of the voltage stabilizing chip U4 is electrically connected with one end of the capacitor C4 and the corresponding end of the sampling resistor circuit respectively, and the 1 st end of the voltage stabilizing chip U4 is grounded; the other end of the capacitor C3 is grounded, and the other end of the capacitor C4 is grounded; the chip model of the voltage stabilizing chip U4 is HT7550-1, and is used for stabilizing the 12 power supply to 5V to supply power to the circuit.

The sampling resistor circuit 300 includes a sampling resistor R9, and the corresponding ends of the sampling resistor R9 are electrically connected with the 3 rd end of the voltage stabilizing chip U4, the inverting operational amplifier circuit, the adder circuit, and the corresponding ends of the 3.3V power supply circuit, respectively.

The 3.3V power supply circuit 400 includes a capacitor C5, a capacitor C6, and a voltage stabilizing chip U5; the 2 nd end of the voltage stabilizing chip U5 is electrically connected with one end of the capacitor C5 and the corresponding end of the sampling resistor R9 respectively, the 3 rd end of the voltage stabilizing chip U5 is electrically connected with one end of the capacitor C6 and the corresponding end of the switch control circuit 500 respectively, and the 1 st end of the voltage stabilizing chip U5 is grounded; the other end of the capacitor C5 is grounded, and the other end of the capacitor C6 is grounded; the chip model of the voltage stabilizing chip U5 is BL9153-3.3V.

The switch control circuit 500 includes a switch SW1, a resistor R10, a resistor R12, a resistor R13, a triode Q1, and a triode Q2; the E end of the triode Q1 is respectively and electrically connected with the 3 rd end of the voltage stabilizing chip U5, one end of the switch SW1 and one end of the resistor R10; the C end of triode Q1 and the other end electric connection of switch SW1, the B end of triode Q1 and the resistance R10 other end, resistance R11 one end electric connection, the resistance R11 other end and the C end electric connection of triode Q2, the B end of triode Q2 respectively with resistance R12 one end, resistance R13 one end electric connection, the E end of triode Q2 and resistance R13 other end electric connection and ground connection, the resistance R12 other end and MCU-PIN2 end electric connection.

The inverting operational amplifier circuit 701 comprises a resistor R1, a resistor R4, a resistor R7, a capacitor C1 and an operational amplifier chip U1; the 2 nd end of the operational amplifier chip U1 is electrically connected with one end of a resistor R1, one end of a capacitor C1 and one end of a resistor R4 respectively, the 3 rd end of the operational amplifier chip U1 is grounded through a resistor R7 respectively, and the 1 st end of the operational amplifier chip U1 is electrically connected with the other end of the resistor R1, the other end of the capacitor C1 and the corresponding end of an adder circuit respectively; the other end of the resistor R4 is electrically connected with the corresponding end of the sampling resistor R9.

The adder circuit 702 comprises a resistor R5, a resistor R3, an operational amplifier chip U3, a resistor R2, a capacitor C2 and a resistor R8; the 6 th end of the operational amplifier chip U1 is electrically connected with one end of a resistor R5, a resistor R3, a resistor R2 and a capacitor C2 respectively, the 5 th end of the operational amplifier chip U1 is grounded through a resistor R8, the 7 th end of the operational amplifier chip U1 is electrically connected with the other end of the resistor R2, the other end of the capacitor C2 and the corresponding end of the follower circuit respectively, and the other end of the resistor R3 is correspondingly electrically connected with the corresponding end of a sampling resistor R9.

The follower circuit 703 includes an operational amplifier chip U2, a resistor R6; the 3 rd end of the operational amplifier chip U2 is electrically connected with the 7 th end of the operational amplifier chip U3, the 2 nd end of the operational amplifier chip U2 is electrically connected with the 1 st end of the operational amplifier chip U2 and one end of the resistor R6 respectively, and the other end of the resistor R6 is electrically connected with the corresponding end of the MCU singlechip.

The working principle of the utility model is as follows:

during testing, the energy storage BMS protection plate 600 is fixed on the clamp, the tested energy storage BMS protection plate 600 is powered by the test needle of the clamp, voltage signals on the resistance circuit 200 are sent to the singlechip for processing through the conversion circuit 300, the current of the whole machine is calculated according to the voltage signals, and the current is displayed through the touch display screen 900, so that whether a product is qualified or not is judged.

As can be seen from fig. 2, the +12v dc voltage is first stabilized by the voltage stabilizing chip U4-HT7750-1 to output +5v voltage, then is connected to the sampling resistor R9, and then is converted into +3.3v by the voltage stabilizing chip U5-BL9153-3.3 to supply power to the energy storage BMS protection board 600. The function of the test conversion circuit 700 is mainly to solve the voltage difference between the two points A, B, and the influence of the conversion circuit on the sampling circuit and the tested product is reduced as much as possible by utilizing the characteristics of high input impedance and low output impedance of the integrated operational amplifier IC. The voltage of the point A is amplified in an inverting way by the operational amplifier chip U1-LM358 and then is sent to the point C on the left side of the resistor R5, the adding of the voltage of the point B and the voltage of the point C is realized by the next stage, the sum of the voltages is reversely processed by the resistor R6 and then is output to the singlechip MUC-ADC for AD sampling after the sum of the voltages is processed by the operational amplifier chip U2, and the voltage drop on the resistor R9 is sent to the singlechip VA-VB=Vout, so that the voltage drop value on the sampling resistor R9 is calculated.

When the measured energy storage BMS protection board 600 is to be measured, an instruction is sent out by touching the color screen of the display screen 900, after the MCU_PIN2 outputs a high level and passes through the resistor R2, the B electrode of the triode Q2 is extremely high, the triode Q2 is conducted, the B electrode of the triode Q1 is pulled to a low level, the triode Q1 is conducted, the measured energy storage BMS protection 600 board is connected into a test for starting the test, or the switch SW1 can be directly and manually turned off for testing; when the measured energy storage BMS protection board 600 is to be disconnected, an instruction is sent out through the color screen of the touch display screen 900, after the MCU_PIN2 outputs low level and passes through the resistor R2, the B of the triode Q2 is extremely low level, the triode Q2 is cut off, the B of the triode Q1 is extremely high level, the triode Q1 is also cut off, at the moment, the measured energy storage BMS protection board 600 is disconnected, or the switch SW1 can be directly and manually disconnected.

The entire test circuit simulation is shown in fig. 3: the working principle is as follows:

assuming that the actual whole current of the energy storage BMS protection board 600 is IC, the current on the sampling resistor R9 is IL, and I0 is the current value on the sampling resistor R9 when the BMS board is not enabled, i.e. the current of the intermediate loop when the switch SW1 or the triode Q1 is turned off. I0 is mainly determined by the static working current and static leakage current of the voltage stabilizing chip U5, the capacitor C6 and related components in the following circuit in FIG. 2, and when external factors such as temperature are stable, the change of the current value is very tiny and can be ignored. The singlechip converts the voltage value acquired by the sampling resistor R9 into a complete machine current value IC of the BMS product to be tested;

let V0 be the voltage value across resistor R9 from I0 when SW1 or Q1 is turned off in fig. 3, that is, the initial value of VX, namely: i0 Let VO/R1 (1) set the measured energy storage BMS board as linear load, as in fig. 3, after SW1 or Q1 is closed, flow through BMS

The relation between the protection board product current IC and the voltage VX at two ends of R9 is as follows:

IC＝aVX+b (2)

let the relation between the current IL at R9 and the voltage VX across R9 be: il=a 'vx+b' (3)

When the switch SW1 or Q1 shown in FIG. 3 is closed, there is IL=IC+I0 (4)

When K is closed, after the test circuit is connected to the tested energy storage BMS board product, the voltage increase value at the two ends of the resistor R9 is the product of the whole product current IC and the R9 resistance.

From the formulae (1) to (4), IC=IL-IO=VX/R1+b' -VO/R1 (5)

Comparing formula (2) with formula (5), we can obtain: a=a=1/r1b=b' =1/R1 (6)

The combined type (1) to the formula (6) can be obtained; IC=IL-IO=VX/R1+1/R1-VO/R1 (7)

Assuming that the dormant power consumption current of the energy storage BMS protection board is IC ', the current on the sampling resistor R9 is IL', the current on the sampling resistor R9 is the current value when the energy storage BMS protection board is not connected, and the energy storage BMS protection board enters into dormant state by touching a color screen of the display screen to send instructions or a reset key on the BMS main board, and then the testing steps from the above (1) to the formula (7) are sequentially carried out,

in summary, the sleep power consumption current of the BMS board is obtained by the association formulas (1) to (7):

IC＇＝IL＇-IO＇＝VX＇/R1+1/R1-VO＇/R1。

the foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. Micro-current circuit that energy storage BMS product detected, characterized in that includes: the device comprises a 12V power supply, a 5V power supply circuit, a sampling resistor circuit, a 3.3V power supply circuit, a switch control circuit, an energy storage BMS protection board, a conversion circuit, a main control circuit and a touch display screen;

2. The micro-current circuit for detecting the energy storage BMS product according to claim 1, wherein the main control circuit comprises an MCU singlechip.

3. The micro-current circuit for detecting the energy storage BMS product according to claim 1, wherein the 5V power supply circuit comprises a capacitor C3, a voltage stabilizing chip U4 and a capacitor C4; the 2 nd end of the voltage stabilizing chip U4 is electrically connected with one end of the capacitor C3 and the power end of the 12V power supply respectively, the 3 rd end of the voltage stabilizing chip U4 is electrically connected with one end of the capacitor C4 and the corresponding end of the sampling resistor circuit respectively, and the 1 st end of the voltage stabilizing chip U4 is grounded; the other end of the capacitor C3 is grounded, and the other end of the capacitor C4 is grounded; the chip model of the voltage stabilizing chip U4 is HT7550-1, and is used for stabilizing the 12 power supply to 5V to supply power to the circuit.

4. The micro-current circuit for detecting the energy storage BMS product according to claim 3, wherein the sampling resistor circuit comprises a sampling resistor R9, and the corresponding end of the sampling resistor R9 is electrically connected with the corresponding ends of the 3 rd end of the voltage stabilizing chip U4, the inverting operational amplifier circuit, the adder circuit and the 3.3V power supply circuit respectively.

5. The micro-current circuit for energy storage BMS product detection according to claim 4, wherein said 3.3V power supply circuit comprises a capacitor C5, a capacitor C6, a voltage stabilizing chip U5; the 2 nd end of the voltage stabilizing chip U5 is electrically connected with one end of the capacitor C5 and the corresponding end of the sampling resistor R9 respectively, the 3 rd end of the voltage stabilizing chip U5 is electrically connected with one end of the capacitor C6 and the corresponding end of the switch control circuit respectively, and the 1 st end of the voltage stabilizing chip U5 is grounded; the other end of the capacitor C5 is grounded, and the other end of the capacitor C6 is grounded; the chip model of the voltage stabilizing chip U5 is BL9153-3.3V.

6. The micro-current circuit for energy storage BMS product detection according to claim 5, wherein said switch control circuit comprises a switch SW1, a resistor R10, a resistor R12, a resistor R13, a transistor Q1, a transistor Q2; the E end of the triode Q1 is respectively and electrically connected with the 3 rd end of the voltage stabilizing chip U5, one end of the switch SW1 and one end of the resistor R10; the C end of triode Q1 and the other end electric connection of switch SW1, the B end of triode Q1 and the resistance R10 other end, resistance R11 one end electric connection, the resistance R11 other end and the C end electric connection of triode Q2, the B end of triode Q2 respectively with resistance R12 one end, resistance R13 one end electric connection, the E end of triode Q2 and resistance R13 other end electric connection and ground connection.

7. The micro-current circuit for energy storage BMS product detection according to claim 6, wherein said inverting operational amplifier circuit comprises a resistor R1, a resistor R4, a resistor R7, a capacitor C1, an operational amplifier chip U1; the 2 nd end of the operational amplifier chip U1 is electrically connected with one end of a resistor R1, one end of a capacitor C1 and one end of a resistor R4 respectively, the 3 rd end of the operational amplifier chip U1 is grounded through a resistor R7 respectively, and the 1 st end of the operational amplifier chip U1 is electrically connected with the other end of the resistor R1, the other end of the capacitor C1 and the corresponding end of an adder circuit respectively; the other end of the resistor R4 is electrically connected with the corresponding end of the sampling resistor R9.

8. The micro-current circuit for energy storage BMS product detection according to claim 7, wherein said adder circuit comprises a resistor R5, a resistor R3, an operational amplifier chip U3, a resistor R2, a capacitor C2, a resistor R8; the 6 th end of the operational amplifier chip U1 is electrically connected with one end of a resistor R5, a resistor R3, a resistor R2 and a capacitor C2 respectively, the 5 th end of the operational amplifier chip U1 is grounded through a resistor R8, the 7 th end of the operational amplifier chip U1 is electrically connected with the other end of the resistor R2, the other end of the capacitor C2 and the corresponding end of the follower circuit respectively, and the other end of the resistor R3 is correspondingly electrically connected with the corresponding end of a sampling resistor R9.

9. The micro-current circuit for energy storage BMS product detection according to claim 8, wherein said follower circuit comprises an operational amplifier chip U2, a resistor R6; the 3 rd end of the operational amplifier chip U2 is electrically connected with the 7 th end of the operational amplifier chip U3, the 2 nd end of the operational amplifier chip U2 is electrically connected with the 1 st end of the operational amplifier chip U2 and one end of the resistor R6 respectively, and the other end of the resistor R6 is electrically connected with the corresponding end of the MCU singlechip.