Test protection circuit, assembly and test device of battery protection board

Abstract

The utility model provides a test protection circuit, an assembly and a test device of a battery protection board, and the test protection circuit comprises a first connection contact which is used for connecting a target power supply end of the battery protection board; the second connection contact is used for connecting a target power supply detection end of the tester; and the switch control sub-circuit is arranged between the first connection contact and the second connection contact so as to control the connection state between the target power supply end of the battery protection board and the target power supply detection end of the tester.

Description

Technical Field

[0001] The present application relates to the technical field of battery detection, and in particular to a testing device for testing protection circuits, components and battery protection boards. Background Art

[0002] After the battery protection board is mounted, it is necessary to connect the battery protection board to the corresponding tester for performance testing. In the prior art (such as the utility model patent with announcement number CN218675131 U), the utility model discloses a power consumption detection device for a lithium battery protection board and a lithium battery protection board device. Through several detection circuits in the detection device, the single string power consumption of the lithium battery protection board corresponding to each string of sampling lines is detected, and the total power consumption of the lithium battery protection board is tested, so as to determine whether there is power consumption abnormality in the battery protection board. In other words, in the prior art, the function of the battery protection board is only tested by the detection device. After the detection device is connected to the battery protection board, additional electrical energy may be introduced into the battery protection board, thereby damaging the electronic devices in the battery protection board. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a testing device for testing protection circuits, components and battery protection boards, which can realize the connection state between the tester and the battery protection board by controlling the on and off of the switch control subcircuit by setting a switch control subcircuit between the target power supply end of the battery protection board and the target power supply detection end of the tester, thereby solving the technical problem in the prior art that the transmission loop between the tester and the battery protection board cannot be cut off, and achieving the technical effect of protecting the electronic devices on the battery protection board during the test process.

[0004] In a first aspect, an embodiment of the present application provides a test protection circuit, which includes: a first connection contact for connecting a target power supply terminal of a battery protection board; a second connection contact for connecting a target power supply detection terminal of a tester; and a switch control subcircuit, which is arranged between the first connection contact and the second connection contact to control the connectivity between the target power supply terminal of the battery protection board and the target power supply detection terminal of the tester.

[0005] Optionally, the test protection circuit also includes: a microprocessor, an output pin of the microprocessor is connected to the control end of the switch control subcircuit; at least one detection contact, respectively led out from a detection pin corresponding to the microprocessor, and the detection contact is used to connect to a voltage terminal to be tested corresponding to the battery protection board; wherein, for each detection contact, the microprocessor is constructed to: control the switch control subcircuit to act according to the comparison result between the voltage value received from the detection contact and the corresponding voltage threshold range, so as to change the connectivity between the target power supply terminal and the target power supply detection terminal.

[0006] Optionally, the at least one detection contact includes at least one of the following items: a first detection contact, led out from the first detection pin of the microprocessor, for connecting to the positive power terminal of the battery protection board; a second detection contact, led out from the second detection pin of the microprocessor, for connecting to the negative power terminal of the battery protection board; a third detection contact, led out from the third detection pin of the microprocessor, for connecting to the first bus signal pin of the fuel meter of the battery protection board; a fourth detection contact, led out from the fourth detection pin of the microprocessor, for connecting to the second bus signal pin of the fuel meter of the battery protection board.

[0007] Optionally, the test protection circuit also includes: a third connection contact, used to connect to a preset power supply detection terminal of the tester; wherein, the target power supply detection terminal is one of the positive power supply detection terminal of the tester and the negative power supply detection terminal of the tester, the preset power supply detection terminal is the other of the positive power supply detection terminal of the tester and the negative power supply detection terminal of the tester, the target power supply terminal is the positive power supply terminal of the battery protection board or the negative power supply terminal of the battery protection board, and the target power supply detection terminal has the same polarity as the target power supply terminal.

[0008] Optionally, the first connecting contact and the first detecting contact or the second detecting contact are the same contact.

[0009] Optionally, the switch control subcircuit includes a first control switch and a second control switch, wherein the first connection end of the first control switch is connected to the first connection contact, the second connection end of the first control switch is connected to the second connection contact, the control end of the first control switch is connected to the first connection end of the second control switch, the second connection end of the second control switch is grounded, and the control end of the second control switch is connected to the output pin of the microprocessor.

[0010] Optionally, the switch control subcircuit further includes a first capacitor, a first resistor, a second resistor, a third resistor and a fourth resistor, wherein the first resistor and the first capacitor are connected in parallel, and the first resistor and the first capacitor are arranged between the first connection end of the first control switch and the control end of the first control switch, the second resistor is arranged between the control end of the first control switch and the first connection end of the second control switch, the third resistor is arranged between the control end of the second control switch and the output pin of the microprocessor, and the fourth resistor is arranged between the control end of the second control switch and the second connection end of the second control switch.

[0011] Optionally, the test protection circuit also includes: a first communication contact, which is led out from the communication input pin of the microprocessor and is used to connect to the communication output pin of the tester; wherein the microprocessor is constructed to: control the switch control subcircuit to act according to the communication signal received by the first communication contact to change the connectivity between the target power supply terminal and the target power supply detection terminal.

[0012] Optionally, the test protection circuit further includes: a power contact, which is led out from a power pin of the microprocessor and is used to connect a preset power supply of the tester to power the microprocessor.

[0013] Optionally, the test protection circuit further includes: a filtering subcircuit, which is arranged between the power contact and the power pin of the microprocessor to filter the power input to the power pin.

[0014] Optionally, the filtering subcircuit includes a second capacitor, a third capacitor, a diode and an inductor, one end of the second capacitor, the third capacitor and the diode are respectively connected to the power pin of the microprocessor, and the second capacitor, the third capacitor and the diode are connected in parallel, the other end of the parallel connection of the second capacitor, the third capacitor and the diode is grounded, and the inductor is arranged between the power pin of the microprocessor and the power contact.

[0015] Optionally, the test protection circuit also includes: a second communication contact, which is connected to the communication output pin of the microprocessor and is used to connect to the communication input pin of the tester; a prompt sub-circuit, wherein the first connection end of the prompt sub-circuit is connected to the power contact, and the second connection end of the prompt sub-circuit is connected to the communication output pin of the microprocessor; wherein, for each detection contact, the microprocessor is constructed to: control the prompt sub-circuit to issue a prompt for the connectivity status between the target power terminal and the target power supply detection terminal based on the comparison result of the voltage value received from the detection contact and the corresponding voltage threshold range, and / or, report the connectivity status between the target power terminal and the target power supply detection terminal to the tester based on the comparison result of the voltage value received from the detection contact and the corresponding voltage threshold range.

[0016] Optionally, the prompt subcircuit includes a prompt light and a third control switch, wherein one end of the prompt light is connected to the power contact, the other end of the prompt light is connected to the first connection end of the third control switch, the second connection end of the third control switch is grounded, and the control end of the third control switch is connected to the communication output pin of the microprocessor, wherein when the control end of the third control switch receives a preset level signal sent by the communication output pin of the microprocessor, the third control switch performs a corresponding action to control the prompt light to turn on and off, so as to indicate the connectivity status between the target power supply end and the target power supply detection end.

[0017] Optionally, the prompt subcircuit also includes a fifth resistor and a sixth resistor, one end of the fifth resistor is connected to the communication output pin of the microprocessor, the other end of the fifth resistor is connected to the control end of the third control switch, and the sixth resistor is arranged between the control end of the third control switch and the second connection end of the third control switch.

[0018] Optionally, the test protection circuit also includes a seventh resistor and an eighth resistor, wherein the seventh resistor is arranged between the communication input pin of the microprocessor and the first communication contact, the enable pin of the microprocessor is connected to one end of the eighth resistor, and the other end of the eighth resistor is grounded.

[0019] In the second aspect, an embodiment of the present application also provides a test protection component, which includes a test protection circuit as described in the first aspect or any possible implementation scheme of the first aspect, and the test protection circuit is packaged as a component, wherein the first connection contact is brought out for connecting to the battery protection board, and the second connection contact is brought out for connecting to the tester.

[0020] In the third aspect, an embodiment of the present application also provides a test device for a battery protection board, the test device comprising: a tester, wherein a target power supply detection terminal of the tester is connected to a second connection contact; a test protection component as described in the above second aspect or any possible implementation manner of the second aspect, wherein the first connection contact of the test protection component is used to connect to the battery protection board.

[0021] The embodiment of the present application provides a test device for testing a protection circuit, a component and a battery protection board. The test protection circuit includes: a first connection contact, used to connect to a target power supply terminal of a battery protection board; a second connection contact, used to connect to a target power supply detection terminal of a tester; a switch control subcircuit, arranged between the first connection contact and the second connection contact, to control the connectivity between the target power supply terminal of the battery protection board and the target power supply detection terminal of the tester. By setting a switch control subcircuit between the target power supply terminal of the battery protection board and the target power supply detection terminal of the tester, the connectivity between the tester and the battery protection board is controlled by controlling the on and off of the switch control subcircuit, thereby solving the technical problem in the prior art that the transmission loop between the tester and the battery protection board cannot be disconnected in time, and achieving the technical effect of protecting the electronic devices on the battery protection board during the test.

[0022] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A structural schematic diagram of a test protection circuit provided in an embodiment of the present application is shown.

[0025] Figure 2 A circuit diagram of a test protection circuit provided in an embodiment of the present application is shown.

[0026] Figure 3 A circuit diagram of a battery protection board provided in an embodiment of the present application is shown.

[0027] Component Symbols:

[0028] Figure 1 In FIG. 1 , A1 is a first connection contact, A2 is a second connection contact, and 101 is a switch control subcircuit; Figure 2In the figure, U1 is a microprocessor, PB0 is an output pin of the microprocessor, P+1 is a first detection contact, PA0 is a first detection pin of the microprocessor, P-1 is a second detection contact, PA1 is a second detection pin of the microprocessor, CLK is a third detection contact, PA2 is a third detection pin of the microprocessor, DA is a fourth detection contact, PA3 is a fourth detection pin of the microprocessor, Q1 is a first control switch, Q2 is a second control switch, C1 is a first capacitor, R1 is a first resistor, R2 is a second resistor, R3 is a third resistor, R4 is a fourth resistor, and RX is a first communication contact. point, UART-RX is the communication input pin of the microprocessor, V+ is the power contact, VCC is the power pin of the microprocessor, 102 is the filtering sub-circuit, C2 is the second capacitor, C3 is the third capacitor, D1 is a diode, L1 is an inductor, TX is the second communication contact, UART-TX is the communication output pin of the microprocessor, 103 is the prompt sub-circuit, D2 is the prompt light, Q3 is the third control switch, R5 is the fifth resistor, R6 is the sixth resistor, R7 is the seventh resistor, R8 is the eighth resistor, OEZ is the enable pin of the microprocessor, and GND1 is the ground of the test protection circuit; Figure 3 In the figure, Bat+ is the positive detection terminal of the battery protection board, Bat- is the negative detection terminal of the battery protection board, GND2 is the ground terminal, C+ is the device connection terminal, R9 is the ninth resistor, C4 is the fourth capacitor, P+ is the positive power terminal of the battery protection board, P- is the negative power terminal of the battery protection board, U2 is the first protection chip, R10 is the tenth resistor, C5 is the fifth capacitor, C6 is the sixth capacitor, RS1 is the first sampling resistor, RS2 is the second sampling resistor, Q4 is the first charge and discharge control switch, R11 is the eleventh resistor, C7 is the seventh capacitor, C8 is the eighth capacitor, U3 is the second protection chip, R12 is the twelfth resistor, C9 is the ninth capacitor, C10 is the tenth capacitor, Q5 is the second charge and discharge control control switch, R13 is the thirteenth resistor, C11 is the eleventh capacitor, C12 is the twelfth capacitor, U4 is the electricity meter, R14 is the fourteenth resistor, R15 is the fifteenth resistor, C13 is the thirteenth capacitor, C14 is the fourteenth capacitor, C15 is the fifteenth capacitor, R16 is the sixteenth resistor, C16 is the sixteenth capacitor, C17 is the seventeenth capacitor, C18 is the eighteenth capacitor, R17 is the seventeenth resistor, R18 is the eighteenth resistor, R19 is the nineteenth resistor, R20 is the twentieth resistor, R21 is the twenty-first resistor, R22 is the twenty-second resistor, R23 is the twenty-third resistor, D3 is the third diode, D4 ​​is the fourth diode, C19 is the nineteenth capacitor, and C20 is the twentieth capacitor. DETAILED DESCRIPTION

[0029] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work belongs to the scope of protection of the present application.

[0030] In the prior art, the power of the battery protection board is detected by connecting a tester and a battery protection board, and whether the power output of the battery protection board will be disconnected when an abnormal situation such as overvoltage or undervoltage occurs during the operation of the battery protection board. When the tester is connected to the battery protection board, abnormal voltage may be introduced into the battery protection board, thereby damaging the electronic devices on the battery protection board.

[0031] In view of the above problems, the embodiments of the present application provide a test device for testing protection circuits, components and battery protection boards. By setting a switch control subcircuit between the target power supply end of the battery protection board and the target power supply detection end of the tester, the connection state between the tester and the battery protection board is controlled by controlling the on and off of the switch control subcircuit, which solves the technical problem that the transmission circuit between the tester and the battery protection board cannot be cut off in the prior art, and achieves the technical effect of protecting the electronic devices on the battery protection board during the test, which is as follows:

[0032] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a test protection circuit provided in an embodiment of the present application. Figure 1 As shown, the test protection circuit provided in the embodiment of the present application includes: a first connection contact A1, used to connect the target power supply terminal of the battery protection board; a second connection contact A2, used to connect the target power supply detection terminal of the tester; a switch control subcircuit 101, arranged between the first connection contact and the second connection contact to control the connectivity between the target power supply terminal of the battery protection board and the target power supply detection terminal of the tester.

[0033] That is to say, a switch control subcircuit is set between the target power supply terminal of the battery protection board and the target power supply detection terminal of the tester through the test protection circuit. When the switch control subcircuit is closed, a transmission loop is formed between the target power supply terminal of the battery protection board and the target power supply detection terminal of the tester, so that the tester can detect various functions of the battery protection board. When the switch control subcircuit is disconnected, a transmission loop cannot be formed between the target power supply terminal of the battery protection board and the target power supply detection terminal of the tester, so that the tester cannot detect the battery protection board.

[0034] See also Figure 2 , Figure 2 A circuit diagram of a test protection circuit provided in an embodiment of the present application. Figure 2 As shown, the test protection circuit provided in the embodiment of the present application also includes: a microprocessor U1, wherein the output pin PB0 of the microprocessor is connected to the control end of the switch control subcircuit; at least one detection contact, each of which is led out from a detection pin corresponding to the microprocessor, and each detection contact is used to connect to a voltage terminal to be tested corresponding to the battery protection board; wherein, for each detection contact, the microprocessor is constructed to: according to the comparison result of the voltage value received from the detection contact and the corresponding voltage threshold range, control the switch control subcircuit to act so as to change the connectivity between the target power supply terminal and the target power supply detection terminal.

[0035] That is to say, the detection pin of the microprocessor is led out as a detection contact, and the detection contact is used to connect a voltage terminal to be measured corresponding to the battery protection board. Furthermore, one detection pin corresponds to one detection contact and one voltage terminal to be measured.

[0036] Specifically, the microprocessor is constructed to: determine whether the voltage value detected by the detection contact belongs to the corresponding voltage threshold range; if the voltage value detected by the detection contact belongs to the corresponding voltage threshold range, the control switch control subcircuit is closed, thereby controlling the target power supply terminal and the target power supply detection terminal to be connected, so that a loop is formed between the tester and the battery protection board; if the voltage value detected by the detection contact does not belong to the corresponding voltage threshold range, the control switch control subcircuit is disconnected, thereby changing the connection state between the target power supply terminal and the target power supply detection terminal, so that the loop between the tester and the battery protection board is disconnected.

[0037] The at least one detection contact includes at least one of the following items: a first detection contact, led out from the first detection pin of the microprocessor, for connecting one of the positive power terminal and the negative power terminal of the battery protection board; a second detection contact, led out from the second detection pin of the microprocessor, for connecting the other of the positive power terminal and the negative power terminal of the battery protection board; a third detection contact, led out from the third detection pin of the microprocessor, for connecting one of the first bus signal pin and the second bus signal pin of the fuel meter of the battery protection board; a fourth detection contact, led out from the fourth detection pin of the microprocessor, for connecting the other of the first bus signal pin and the second bus signal pin of the fuel meter of the battery protection board.

[0038] That is to say, the voltage end to be measured includes at least one of the following: the positive power supply end of the battery protection board, the negative power supply end of the battery protection board, the first bus signal pin of the fuel gauge of the battery protection board, and the second bus signal pin of the fuel gauge of the battery protection board.

[0039] Among them, the first bus signal pin of the fuel gauge of the battery protection board is used for transmitting the clock signal CLOCK, and the second bus signal pin of the fuel gauge of the battery protection board is used for transmitting the data signal DATA.

[0040] Exemplarily, the first detection contact P+1 of the present application is led out from the first detection pin PA0 of the microprocessor, and is used to connect the positive power terminal of the battery protection board, the second detection contact P-1 is led out from the second detection pin PA1 of the microprocessor, and is used to connect the negative power terminal of the battery protection board, the third detection contact CLK is led out from the third detection pin PA2 of the microprocessor, and is used to connect to the first bus signal pin of the fuel meter of the battery protection board, and the fourth detection contact DA is led out from the fourth detection pin PA3 of the microprocessor, and is used to connect to the second bus signal pin of the fuel meter of the battery protection board.

[0041] The test protection circuit also includes: a third connection contact, used to connect to the preset power supply detection terminal of the tester; wherein, the target power supply detection terminal is one of the positive power supply detection terminal of the tester and the negative power supply detection terminal of the tester, the preset power supply detection terminal is the other of the positive power supply detection terminal of the tester and the negative power supply detection terminal of the tester, the target power supply terminal is the positive power supply terminal of the battery protection board or the negative power supply terminal of the battery protection board, and the target power supply detection terminal has the same polarity as the target power supply terminal.

[0042] Among them, the connection contact for connecting the negative power supply detection terminal of the tester is used as the ground of the test protection circuit.

[0043] That is, if the first connection contact is used to connect the positive power terminal of the battery protection board, the second connection contact is used to connect the positive power detection terminal of the tester, so that the power output of the positive power terminal of the battery protection board flows into the positive power detection terminal of the tester through the switch control subcircuit, and the power output of the negative power detection terminal of the tester flows into the negative power terminal of the battery protection board; or, if the first connection contact is used to connect the negative power terminal of the battery protection board, the second connection contact is used to connect the negative power detection terminal of the tester, so that the power output of the positive power terminal of the battery protection board flows into the positive power detection terminal of the tester, and the power output of the negative power detection terminal of the tester flows into the negative power terminal of the battery protection board through the switch control subcircuit. Thus, a transmission loop is formed between the battery protection board and the tester by controlling the switch control subcircuit to close, and the transmission loop formed between the battery protection board and the tester is disconnected by controlling the switch control subcircuit to open.

[0044] Wherein, the first connection contact is the same contact as the first detection contact or the second detection contact. Thus, the circuit structure of the test protection circuit can be simplified, and no matter whether the first connection contact is the same contact as the first detection contact or the second detection contact, it is necessary to ensure that the polarity of the target power supply terminal connected to the first connection contact is the same as the polarity of the target power supply detection terminal connected to the second connection contact.

[0045] Exemplarily, the first connection contact A1 and the first detection contact P+1 of the present application are the same contact, which is used to connect the positive power supply terminal of the battery protection board, the second connection contact A2 is used to connect the positive power supply detection terminal of the tester, and the third connection contact GND1 is used to connect the negative power supply detection terminal of the tester. The third connection contact is used as the ground of the test protection circuit.

[0046] The switch control subcircuit 101 includes a first control switch Q1 and a second control switch Q2, wherein a first connection end of the first control switch Q1 is connected to the first connection contact A1 or the first detection contact P+1, a second connection end of the first control switch Q1 is connected to the second connection contact A2, a control end of the first control switch Q1 is connected to a first connection end of the second control switch Q2, a second connection end of the second control switch Q2 is grounded, and a control end of the second control switch Q2 is connected to an output pin PB0 of the microprocessor.

[0047] Specifically, for each detection contact, the microprocessor is configured to: determine the level signal CTRL output by the output pin of the microprocessor based on the comparison result of the voltage value collected by the detection contact and the corresponding voltage threshold range, so that the second control switch performs a corresponding action based on the level signal CTRL, thereby changing the level signal received by the control end of the second control switch, and then the second control switch performs a corresponding action to change the connectivity between the target power supply end and the target power supply detection end.

[0048] Exemplarily, the first control switch is a PMOS transistor, and the second control switch is an NMOS transistor.

[0049] Specifically, for each detection contact, the microprocessor is configured to: determine whether the voltage value collected by the detection contact belongs to the corresponding voltage threshold range; if the voltage value collected by the detection contact belongs to the corresponding voltage threshold range, the output pin of the microprocessor outputs a low-level signal, so that the second control switch is disconnected and the first control switch is closed, thereby controlling the target power supply terminal and the target power supply detection terminal to be in a connected state, so that a loop is formed between the tester and the battery protection board; if the voltage value collected by the detection contact does not belong to the corresponding voltage threshold range, the output pin of the microprocessor outputs a high-level signal, so that the second control switch is closed and the first control switch is disconnected, thereby changing the connected state between the target power supply terminal and the target power supply detection terminal, so that the loop between the tester and the battery protection board is disconnected.

[0050] The switch control subcircuit 101 also includes a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, wherein the first resistor and the first capacitor are connected in parallel and arranged between the first connection end of the first control switch and the control end of the first control switch, the second resistor is arranged between the control end of the first control switch and the first connection end of the second control switch, the third resistor is arranged between the control end of the second control switch and the output pin of the microprocessor, and the fourth resistor is arranged between the control end of the second control switch and the second connection end of the second control switch.

[0051] The first resistor and the first capacitor are connected in parallel and arranged between the first connection end and the control end of the first control switch to protect the first control switch. The second resistor, the third resistor and the fourth resistor all play a voltage dividing role to protect the second control switch.

[0052] The test protection circuit also includes: a first communication contact RX, which is connected to the communication output pin UART-RX of the microprocessor and is used to connect to the communication output pin of the tester; wherein the microprocessor is constructed to: control the switch control subcircuit to act according to the communication signal received by the first communication contact to change the connectivity between the target power supply terminal and the target power supply detection terminal.

[0053] The communication signal is sent from the tester. When the tester determines that the battery protection board has power anomalies during the detection of the battery protection board, the communication output pin of the tester sends a communication signal to the communication input pin of the microprocessor. Therefore, the microprocessor receives the communication signal and controls the switch control subcircuit to disconnect through the output pin PB0 of the microprocessor, thereby disconnecting the loop between the target power supply end and the target power supply detection end.

[0054] Exemplarily, the communication signal can be used to control the on and off of the switch control subcircuit through a level signal. If the communication signal is a low-level signal, it means that the tester informs the microprocessor that it is currently in a normal state and keeps the target power supply terminal and the target power supply detection terminal connected. When the microprocessor receives a communication signal that is a low-level signal, the output pin PB0 of the microprocessor controls the target power supply terminal and the target power supply detection terminal to be connected; if the communication signal is a high-level signal, it means that the tester informs the microprocessor that it is currently in an abnormal state and needs to disconnect the connection between the target power supply terminal and the target power supply detection terminal. When the microprocessor receives a communication signal that is a high-level signal, the output pin PB0 of the microprocessor controls the circuit between the target power supply terminal and the target power supply detection terminal to be disconnected.

[0055] The test protection circuit also includes: a power contact V+, which is led out from the power pin VCC of the microprocessor and is used to connect to a preset power supply of the tester to power the microprocessor.

[0056] That is, the preset power supply of the tester is used to power the microprocessor, and the preset power supply can be set to 5V.

[0057] The test protection circuit further includes: a filtering subcircuit 102, which is arranged between the power contact V+ and the power pin VCC of the microprocessor to filter the power input to the power pin.

[0058] That is to say, the electric energy output by the preset power supply of the tester is filtered by the filtering subcircuit, so that the power received by the microprocessor is more stable.

[0059] The filtering subcircuit 102 includes a second capacitor C2, a third capacitor C3, a diode D1 and an inductor L1, one end of the second capacitor, the third capacitor and the diode being connected in parallel is connected to the power pin of the microprocessor, the other end of the second capacitor, the third capacitor and the diode being connected in parallel is grounded, and the inductor is arranged between the power pin of the microprocessor and the power contact.

[0060] The diode may be configured as a bidirectional breakdown diode, and the electric energy of the preset power supply may be filtered through the second capacitor, the third capacitor, the diode and the inductor.

[0061] The test protection circuit also includes: a second communication contact TX, which is connected to the communication output pin UART-TX of the microprocessor and is used to connect to the communication input pin of the tester; a prompt sub-circuit 103, wherein the first connection end of the prompt sub-circuit is connected to the power contact, and the second connection end of the prompt sub-circuit is connected to the communication output pin of the microprocessor; wherein, for each detection contact, the microprocessor is constructed to: according to the comparison result of the voltage value received from the detection contact and the corresponding voltage threshold range, control the prompt sub-circuit to issue a prompt for the connectivity status between the target power terminal and the target power supply detection terminal, and / or, according to the comparison result of the voltage value received from the detection contact and the corresponding voltage threshold range, report the connectivity status between the target power terminal and the target power supply detection terminal to the tester.

[0062] That is to say, for each detection contact, the microprocessor is constructed to: determine whether the voltage value received by the detection contact belongs to the corresponding voltage threshold range; if the voltage value received by the detection contact belongs to the corresponding voltage threshold range, the communication output pin UART-TX of the microprocessor outputs a first level signal, so that the prompt subcircuit sends a prompt about the connection of the loop between the target power supply terminal and the target power supply detection terminal according to the first level signal, and the tester receives the first level signal, so that the tester determines that the loop between the target power supply terminal and the target power supply detection terminal is connected; if the voltage value received by the detection contact does not belong to the corresponding voltage threshold range, the communication output pin UART-TX of the microprocessor outputs a second level signal, so that the prompt subcircuit sends a prompt about the disconnection of the loop between the target power supply terminal and the target power supply detection terminal according to the second level signal, and the tester receives the second level signal, so that the tester determines that the loop between the target power supply terminal and the target power supply detection terminal is disconnected.

[0063] Specifically, the prompt subcircuit 103 includes a prompt light D2 and a third control switch Q3, wherein one end of the prompt light is connected to the power contact, the other end of the prompt light is connected to the first connection end of the third control switch, the second connection end of the third control switch is grounded, and the control end of the third control switch is connected to the communication output pin of the microprocessor, wherein when the control end of the third control switch receives a preset level signal sent by the communication output pin of the microprocessor, the third control switch performs a corresponding action to control the on and off of the prompt light to indicate the connectivity status between the target power supply end and the target power supply detection end.

[0064] Wherein, for each detection contact, the microprocessor is constructed as follows: if the voltage value received by the detection contact belongs to the corresponding voltage threshold range, the communication output pin UART-TX of the microprocessor outputs a first level signal, so that the prompt subcircuit sends a prompt about the connection of the loop between the target power supply terminal and the target power supply detection terminal according to the first level signal, and the tester receives the first level signal, so that the tester determines that the loop between the target power supply terminal and the target power supply detection terminal is connected; if the voltage value received by the detection contact does not belong to the corresponding voltage threshold range, the communication output pin UART-TX of the microprocessor outputs a second level signal, so that the prompt subcircuit sends a prompt about the disconnection of the loop between the target power supply terminal and the target power supply detection terminal according to the second level signal, and the tester receives the second level signal, so that the tester determines that the loop between the target power supply terminal and the target power supply detection terminal is disconnected.

[0065] The first level signal is one of a high level signal and a low level signal, the second level signal is the other of the high level signal and the low level signal, and the preset level signal is the first level signal or the second level signal. Thus, by controlling the opening or closing of the third control switch, the prompt light is turned on or off, thereby prompting that the loop between the target power supply terminal and the target power supply detection terminal is turned on or off.

[0066] Exemplarily, the third control switch is an NPN transistor. Further, when the control end of the third control switch receives a high-level signal from the communication output pin of the microprocessor, the third control switch is closed, and the prompt light is controlled to light up, so as to indicate that the circuit between the target power supply terminal and the target power supply detection terminal is one of on and off; when the control end of the third control switch receives a low-level signal from the communication output pin of the microprocessor, the third control switch is disconnected, and the prompt light is controlled to turn off, so as to indicate that the circuit between the target power supply terminal and the target power supply detection terminal is the other of on and off.

[0067] Furthermore, the tester can determine the number of times the switch control subcircuit is disconnected by periodically reading the signal sent by the second communication contact, thereby facilitating optimization of the battery protection board.

[0068] The prompt subcircuit 103 also includes a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor is connected to the communication output pin of the microprocessor, the other end of the fifth resistor is connected to the control end of the third control switch, and the sixth resistor is arranged between the control end of the third control switch and the second connection end of the third control switch.

[0069] The fifth resistor and the sixth resistor play a voltage dividing role, thereby protecting the third control switch.

[0070] The test protection circuit also includes a seventh resistor R7 and an eighth resistor R8, wherein the seventh resistor is arranged between the communication input pin of the microprocessor and the first communication contact, the enable pin of the microprocessor is connected to one end of the eighth resistor, and the other end of the eighth resistor is grounded.

[0071] Among them, the seventh resistor is used to protect the microprocessor, and the voltage at the first communication contact impacts the microprocessor. The eighth resistor is connected between the enable pin OEZ of the microprocessor and the ground GND1 of the test protection circuit. Since the third connection contact is connected to the negative power supply detection terminal of the tester, although the voltage value of the negative power supply detection terminal of the tester may be small, the eighth resistor is also needed to protect the microprocessor. In addition, the enable pin of the microprocessor determines that the microprocessor is connected to the tester by detecting the voltage value of the third connection contact, so that the microprocessor starts to work.

[0072] Based on the same application concept, a test protection component corresponding to the test protection circuit provided in the above embodiment is also provided in the embodiment of the present application. Since the principle of solving the problem by the test protection component in the embodiment of the present application is similar to that of the test protection circuit in the above embodiment of the present application, the implementation of the test protection component can refer to the implementation, and the repeated parts will not be repeated.

[0073] A test protection component is also provided in an embodiment of the present application, and the test protection component includes the test protection circuit described in any of the above embodiments, and the test protection circuit is packaged as a component, wherein the first connection contact is brought out to be connected to the battery protection board outside the package, and the second connection contact is brought out to be connected to the tester outside the package.

[0074] A test device for a battery protection board is also provided in an embodiment of the present application, and the test device includes: a tester, wherein a target power supply detection terminal of the tester is connected to a second connection contact; and a test protection component as described in any of the above embodiments, wherein the first connection contact of the test protection component is used to connect to the battery protection board.

[0075] For example, see Figure 3 , the present application embodiment also provides a circuit diagram of a battery protection board, such as Figure 3 As shown, the detection positive terminal Bat+ of the battery protection board is connected to the positive electrode of the battery, the detection negative terminal Bat- of the battery protection board is connected to the negative electrode of the battery, and the detection negative terminal Bat- of the battery protection board is connected to the ground terminal GND2. The device connection terminal C+ is led out from the detection positive terminal, so that the device using the battery power can determine the voltage of the battery through the device connection terminal, wherein the ninth resistor R9 and the fourth capacitor C4 are connected in parallel and arranged between the detection positive terminal Bat+ and the device connection terminal C+, which plays a role in protecting the device.

[0076] The positive power terminal P+ of the battery protection board is led out from the positive detection terminal of the battery protection board, and the transmission line between the positive power terminal P+ of the battery protection board and the positive detection terminal of the battery protection board is used as the first power transmission line, and the transmission line between the negative power terminal P- of the battery protection board and the negative detection terminal of the battery protection board is used as the second power transmission line, and the negative power terminal P- of the battery protection board is connected to the ground of the test protection circuit.

[0077] Exemplarily, the first detection contact P+1 is connected to the positive power terminal P+ of the battery protection board, and the second detection contact P-1 is connected to the negative power terminal P- of the battery protection board.

[0078] The power pin VDD of the first protection chip U2 is connected to the positive detection terminal of the battery protection board, the ground pin VSS of the first protection chip U2 is connected to the ground terminal GND2, the tenth resistor R10 is set between the power pin VDD of the first protection chip U2 and the positive detection terminal of the battery protection board, the fifth capacitor C5 is set between the power pin VDD of the first protection chip U2 and the ground pin VSS of the first protection chip U2, and the sixth capacitor C6 is set between the power pin VDD of the first protection chip U2 and the first detection pin CS of the first protection chip U2 to play a filtering role.

[0079] The first sampling resistor RS1 and the second sampling resistor RS2 are connected in parallel and arranged on the second power transmission line. One end of the first sampling resistor RS1 and the second sampling resistor RS2 connected in parallel is connected to the detection negative terminal of the battery protection board. The other end of the first sampling resistor RS1 and the second sampling resistor RS2 connected in parallel is connected to the first detection pin CS of the first protection chip U2. One end of the first charge and discharge control switch Q4 is connected to the other end of the first sampling resistor RS1 and the second sampling resistor RS2 connected in parallel. The first protection chip is configured to determine the current flowing through the second power transmission line by detecting the voltage value of the two ends of the first sampling resistor RS1 and the second sampling resistor RS2 connected in parallel, so as to control the on and off of the first charge and discharge control switch Q4, thereby protecting the battery.

[0080] The discharge control pin DO of the first protection chip U2 is connected to the discharge control end of the first charge and discharge control switch Q4, and the charge control pin CO of the first protection chip U2 is connected to the charge control end of the first charge and discharge control switch Q4. The first protection chip is configured to determine the direction of the current flowing through the second power transmission line according to the positive and negative voltage values ​​at both ends of the first sampling resistor RS1 and the second sampling resistor RS2 connected in parallel, so as to determine whether the battery is currently charged or discharged. If the battery is charged, the first charge and discharge control switch Q4 is controlled to operate through the charge control pin CO, and if the battery is discharged, the first charge and discharge control switch Q4 is controlled to operate through the discharge control pin DO. The seventh capacitor C7 and the eighth capacitor C8 are connected in series and connected in parallel with the first charge and discharge control switch Q4 to play a filtering role.

[0081] The second detection pin VM of the first protection chip U2 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the other end of the first charge and discharge control switch Q4. The first protection chip is configured to control the on and off of the first charge and discharge control switch Q4 according to the voltage detected by the second detection pin VM.

[0082] The working principle of the second protection chip U3 is the same as that of the first protection chip, which will not be repeated here. The power pin VDD of the second protection chip U3 is connected to the positive detection terminal of the battery protection board, the ground pin VSS of the second protection chip U3 is connected to the ground terminal GND2, the twelfth resistor R12 is set between the power pin VDD of the second protection chip U3 and the positive detection terminal of the battery protection board, the ninth capacitor C9 is set between the power pin VDD of the second protection chip U3 and the ground pin VSS of the second protection chip U3, and the tenth capacitor C10 is set between the power pin VDD of the second protection chip U3 and the first detection pin CS of the second protection chip U3, which plays a filtering role.

[0083] One end of the second charge and discharge control switch Q5 is connected to the other end of the first charge and discharge control switch Q4, and one end of the second charge and discharge control switch Q5 is connected to the negative power supply terminal P- of the battery protection board. The discharge control pin DO of the second protection chip U3 is connected to the discharge control end of the second charge and discharge control switch Q5, and the charge control pin CO of the second protection chip U3 is connected to the charge control end of the second charge and discharge control switch Q5. The second detection pin VM of the second protection chip U3 is connected to one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected to the other end of the second charge and discharge control switch Q5. The eleventh capacitor C11 and the twelfth capacitor C12 are connected in series and connected in parallel with the second charge and discharge control switch Q5 to play a filtering role.

[0084] The voltage sampling pin SNS of the fuel gauge U4 is connected to one end of the fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to the first power transmission line to collect the voltage value of the first power transmission line. The power pin BAT of the fuel gauge U4 is connected to one end of the fifteenth resistor R15, and the other end of the fifteenth resistor R15 is connected to the first power transmission line to power the fuel gauge. One end of the thirteenth capacitor C13 is connected to the voltage sampling pin SNS of the fuel gauge U4, the other end of the thirteenth capacitor C13 is connected to the ground terminal, one end of the fourteenth capacitor C14 is connected to the power pin BAT of the fuel gauge U4, and the other end of the fourteenth capacitor C14 is connected to the ground terminal. The enable pin UE of the fuel gauge U4 is connected to one end of the fifteenth capacitor C15, the other end of the fifteenth capacitor C15 is connected to the ground terminal, one end of the fifteenth capacitor C15 is connected to one end of the sixteenth resistor R16, and the other end of the sixteenth resistor is connected to the discharge control pin DO of the second protection chip U3. The fuel meter is configured to determine whether the battery is in a normal charging state or discharging state based on the signal DO1 of the discharge control pin DO of the second protection chip U3 collected by the enable pin CE, so that when it is in a normal charging state or discharging state, the fuel meter starts working, and when it is in an abnormal charging state or discharging state, the fuel meter does not work.

[0085] The sixteenth capacitor C16 is connected in parallel between the first acquisition pin SRP and the second acquisition pin SRN of the fuel gauge, the first acquisition pin SRP of the fuel gauge is connected to one end of the seventeenth capacitor C17, the other end of the seventeenth capacitor C17 is connected to the ground, one end of the seventeenth capacitor C17 is connected to one end of the seventeenth resistor R17, the other end of the seventeenth resistor R17 is connected to the ground, the second acquisition pin SRN of the fuel gauge is connected to one end of the eighteenth capacitor C18, the other end of the eighteenth capacitor C18 is connected to the ground, one end of the eighteenth capacitor C18 is connected to one end of the eighteenth resistor R18, the other end of the eighteenth resistor R18 is connected to the other end of the first sampling resistor RS1 and the second sampling resistor RS2 connected in parallel. The fuel gauge is configured to calculate the charging or discharging amount of the battery according to the voltage values ​​collected by the first acquisition pin SRP and the second acquisition pin SRN respectively and the resistance values ​​corresponding to the first sampling resistor RS1 and the second sampling resistor RS2 respectively.

[0086] The first bus signal pin SCL of the fuel meter U4 is connected to one end of the nineteenth resistor R19, the other end of the nineteenth resistor R19 is connected to one end of the twentieth resistor R20, the other end of the twentieth resistor R20 is used to connect to the third detection contact CLK, the second bus signal pin SDA of the fuel meter U4 is connected to one end of the twenty-first resistor R21, the other end of the twenty-first resistor R21 is connected to one end of the twenty-second resistor R22, the other end of the twenty-second resistor R22 is used to connect to the fourth detection contact DA.

[0087] The temperature detection pin TS of the fuel gauge U4 is connected to one end of the twenty-third resistor R23, and the other end of the twenty-third resistor R23 is connected to the ground terminal. The fuel gauge determines whether the battery has an overtemperature condition by determining the change in the voltage value of one end of the twenty-third resistor R23, so that it can report to the tester when the temperature is too high. Among them, the first communication pin scl is led out from the connection line between the other end of the nineteenth resistor R19 and one end of the twentieth resistor R20, and the second communication pin sda is led out from the connection line between the other end of the twenty-first resistor R21 and one end of the twenty-second resistor R22. The first communication pin and the second communication pin are both used to connect to the tester, so as to determine the charge or discharge capacity of the battery and the temperature of the battery through the first communication pin and the second communication pin.

[0088] The ground pin VSS of the fuel gauge U4 is connected to the ground terminal, one end of the third diode D3 is connected to the first communication pin scl, the other end of the third diode D3 is connected between the negative power supply terminal P- of the battery protection board and the second charge and discharge control switch Q5, one end of the fourth diode D4 is connected to the second communication pin sda, the other end of the fourth diode D4 is connected between the negative power supply terminal P- of the battery protection board and the second charge and discharge control switch Q5, the third diode D3 and the fourth diode D4 can protect the fuel gauge U4 from being damaged by the voltage spike introduced by the wire.

[0089] One end of the nineteenth capacitor C19 and the twentieth capacitor C20 connected in series is connected to the first power transmission line, and the other end of the nineteenth capacitor C19 and the twentieth capacitor C20 connected in series is connected to the negative power terminal P- of the battery protection board to play a filtering role.

[0090] Therefore, the present application adds a test protection circuit between the battery protection board and the tester, so that when the test protection circuit determines that the voltage value of any voltage terminal to be tested on the battery protection board is abnormal, it controls the transmission loop between the battery protection board and the tester to be disconnected, thereby protecting the electronic devices on the battery protection board.

[0091] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0092] It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0093] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A test protection circuit, characterized in that: The test protection circuit comprises: A first connection contact, used to connect to a target power supply terminal of a battery protection board; The second connection contact is used to connect to the target power supply detection terminal of the tester; The switch control subcircuit is arranged between the first connection contact and the second connection contact to control the connection state between the target power supply terminal of the battery protection board and the target power supply detection terminal of the tester.

2. The test protection circuit according to claim 1, characterized in that: The test protection circuit also includes: A microprocessor, wherein an output pin of the microprocessor is connected to a control terminal of the switch control subcircuit; At least one detection contact is respectively led out from a detection pin corresponding to the microprocessor, and the detection contact is used to connect a voltage terminal to be measured corresponding to the battery protection board; Among them, for each detection contact, the microprocessor is constructed to: control the switch control subcircuit to act according to the comparison result of the voltage value received from the detection contact and the corresponding voltage threshold range, so as to change the connectivity state between the target power supply terminal and the target power supply detection terminal.

3. The test protection circuit according to claim 2, characterized in that: The at least one detection contact includes at least one of the following: A first detection contact, which is led out from the first detection pin of the microprocessor and is used to connect to the positive power terminal of the battery protection board; A second detection contact, which is led out from the second detection pin of the microprocessor and is used to connect to the negative power terminal of the battery protection board; A third detection contact, led out from the third detection pin of the microprocessor, and used to connect to the first bus signal pin of the fuel meter of the battery protection board; The fourth detection contact is led out from the fourth detection pin of the microprocessor and is used to connect to the second bus signal pin of the fuel meter of the battery protection board.

4. The test protection circuit according to claim 3, characterized in that: The test protection circuit also includes: The third connection contact is used to connect the preset power supply detection terminal of the tester; Among them, the target power supply detection terminal is one of the positive power supply detection terminal and the negative power supply detection terminal of the tester, the preset power supply detection terminal is the other of the positive power supply detection terminal and the negative power supply detection terminal of the tester, the target power supply terminal is the positive power supply terminal of the battery protection board or the negative power supply terminal of the battery protection board, and the target power supply detection terminal has the same polarity as the target power supply terminal.

5. The test protection circuit according to claim 4, characterized in that: The first connecting contact and the first detecting contact or the second detecting contact are the same contact.

6. The test protection circuit according to claim 2, characterized in that: The switch control subcircuit includes a first control switch and a second control switch, The first connection end of the first control switch is connected to the first connection contact, the second connection end of the first control switch is connected to the second connection contact, the control end of the first control switch is connected to the first connection end of the second control switch, the second connection end of the second control switch is grounded, and the control end of the second control switch is connected to the output pin of the microprocessor.

7. The test protection circuit according to claim 6, characterized in that: The switch control subcircuit further includes a first capacitor, a first resistor, a second resistor, a third resistor and a fourth resistor. Among them, the first resistor and the first capacitor are connected in parallel, and the first resistor and the first capacitor are arranged between the first connection end of the first control switch and the control end of the first control switch, the second resistor is arranged between the control end of the first control switch and the first connection end of the second control switch, the third resistor is arranged between the control end of the second control switch and the output pin of the microprocessor, and the fourth resistor is arranged between the control end of the second control switch and the second connection end of the second control switch.

8. The test protection circuit according to claim 2, characterized in that: The test protection circuit also includes: A first communication contact, led out from the communication input pin of the microprocessor, for connecting to the communication output pin of the tester; Wherein, the microprocessor is constructed to: control the switch control subcircuit to act according to the communication signal received by the first communication contact, so as to change the connectivity state between the target power supply terminal and the target power supply detection terminal.

9. The test protection circuit according to claim 2, characterized in that: The test protection circuit also includes: The power contact is led out from the power pin of the microprocessor and is used to connect to a preset power supply of the tester to power the microprocessor.

10. The test protection circuit according to claim 9, characterized in that: The test protection circuit also includes: The filtering subcircuit is arranged between the power contact and the power pin of the microprocessor to filter the power input to the power pin.

11. The test protection circuit according to claim 10, characterized in that: The filtering subcircuit includes a second capacitor, a third capacitor, a diode and an inductor. One end of the second capacitor, the third capacitor and the diode are respectively connected to the power pin of the microprocessor, and the second capacitor, the third capacitor and the diode are connected in parallel, the other ends of the second capacitor, the third capacitor and the diode are grounded, and the inductor is arranged between the power pin of the microprocessor and the power contact.

12. The test protection circuit according to claim 9, characterized in that: The test protection circuit also includes: A second communication contact, led out from the communication output pin of the microprocessor, for connecting to the communication input pin of the tester; a prompt subcircuit, wherein a first connection end of the prompt subcircuit is connected to the power contact, and a second connection end of the prompt subcircuit is connected to a communication output pin of the microprocessor; Among them, for each detection contact, the microprocessor is constructed to: control the prompt subcircuit to issue a prompt for the connectivity status between the target power terminal and the target power supply detection terminal based on the comparison result of the voltage value received from the detection contact and the corresponding voltage threshold range, and / or, report the connectivity status between the target power terminal and the target power supply detection terminal to the tester based on the comparison result of the voltage value received from the detection contact and the corresponding voltage threshold range.

13. The test protection circuit according to claim 12, characterized in that: The prompt subcircuit includes a prompt light and a third control switch. One end of the warning light is connected to the power contact, the other end of the warning light is connected to the first connection end of the third control switch, the second connection end of the third control switch is grounded, and the control end of the third control switch is connected to the communication output pin of the microprocessor. When the control end of the third control switch receives a preset level signal from the communication output pin of the microprocessor, the third control switch performs a corresponding action to control the on and off of the prompt light to indicate the connectivity status between the target power supply end and the target power supply detection end.

14. The test protection circuit according to claim 13, characterized in that: The prompt subcircuit also includes a fifth resistor and a sixth resistor, One end of the fifth resistor is connected to the communication output pin of the microprocessor, the other end of the fifth resistor is connected to the control end of the third control switch, and the sixth resistor is arranged between the control end of the third control switch and the second connection end of the third control switch.

15. The test protection circuit according to claim 8, characterized in that: The test protection circuit further includes a seventh resistor and an eighth resistor, The seventh resistor is arranged between the communication input pin of the microprocessor and the first communication contact, the enable pin of the microprocessor is connected to one end of the eighth resistor, and the other end of the eighth resistor is grounded.

16. A test protection component, characterized in that: The test protection component comprises a test protection circuit as claimed in any one of claims 1 to 15, wherein the test protection circuit is packaged as a component. The first connection contact is led out for connection with the battery protection board, and the second connection contact is led out for connection with the tester.

17. A battery protection board testing device, characterized in that: The testing device comprises: A tester, wherein a target power supply detection terminal of the tester is connected to the second connection contact; The test protection assembly as claimed in claim 16, wherein: The first connection contact of the test protection component is used to connect to the battery protection board.

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