A smart detection circuit for a multi-cell lithium battery protection board
By designing an intelligent detection circuit for multi-string lithium battery protection boards, the detection process is automatically controlled using a timing module and a path switching module. Combined with an anomaly detection module for overvoltage or undervoltage judgment, the problem of cumbersome detection of multiple sets of lithium battery protection boards is solved, achieving automated and high-precision detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN XINDANENG ELECTRONICS CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-26
AI Technical Summary
When there are too many lithium battery protection boards to be tested, staff need to manually switch between tests, making the testing process cumbersome.
Design an intelligent detection circuit for multi-string lithium battery protection boards, including a power module, a timing module, a path switching module, a protection board detection module, and an anomaly detection module. The timing module and the path switching module automatically control the connection status between the protection board detection module and multiple sets of lithium battery protection boards, and the anomaly detection module performs overvoltage or undervoltage judgment. The signal processing module adjusts the detection time.
It enables automatic detection of multiple lithium battery protection boards, improves detection accuracy, avoids false detection, and simplifies the operation process.
Smart Images
Figure CN224287071U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery protection board detection technology, specifically an intelligent detection circuit for multi-string lithium battery protection boards. Background Technology
[0002] A lithium battery protection board is a protective integrated circuit board designed for rechargeable lithium batteries. It can detect and protect against overcharge and over-discharge. To ensure the overcharge and over-discharge detection function of the lithium battery protection board, a relevant lithium battery protection board testing device is used to perform additional overvoltage and over-discharge tests on the lithium battery protection board. However, when there are too many lithium battery protection boards to be tested, relevant personnel need to perform switching processing for the lithium battery protection boards to be tested, which is quite troublesome and therefore needs to be improved. Utility Model Content
[0003] This utility model embodiment provides an intelligent detection circuit for a multi-string lithium battery protection board to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] A smart detection circuit for a multi-string lithium battery protection board includes: a power module, a timing module, a path switching module, a protection board detection module, an anomaly detection module, and a signal processing module.
[0006] The power module is used to connect to DC power.
[0007] The timing module, connected to the power supply module and the signal processing module, is used to set the timing time and provide pulse signals at regular intervals when receiving the first control signal output by the signal processing module, and to adjust the timing time when receiving the second control signal output by the signal processing module.
[0008] The path switching module, connected to the power supply module and the timing module, is used to output the first path signal when the pulse signal is received for the first time, the second path signal when the pulse signal is received for the second time, the third path signal when the pulse signal is received for the third time, and the fourth path signal and reset control when the pulse signal is received for the fourth time.
[0009] The protection board detection module, connected to the path switching module and the anomaly detection module, is used to connect to the voltage sampling terminals of three sets of lithium battery protection boards and output the first detection signal, the second detection signal and the third detection signal respectively. When the first path signal is received, the first detection signal is transmitted to the anomaly detection module. When the second path signal is received, the second detection signal is transmitted to the anomaly detection module. When the third path signal is received, the third detection signal is transmitted to the anomaly detection module.
[0010] The anomaly detection module is used to sample the voltage of the input first detection signal, second detection signal or third detection signal and detect overvoltage or undervoltage, and to output the third control signal in the event of overvoltage or undervoltage.
[0011] The signal processing module, connected to the path switching module and the anomaly detection module, is used to provide a first control signal. When it receives a third control signal and a fourth path signal, it self-locks and outputs a second control signal.
[0012] As a further embodiment of this utility model: the power supply module includes a power interface and a first capacitor; the timing module includes a first timer, a fourth resistor, a second resistor, a third resistor, a second switching transistor, a third switching transistor, a third capacitor, and a second capacitor;
[0013] Preferably, the first end of the power interface is connected to one end of the first capacitor, the fourth and eighth ends of the first timer, and the seventh end of the first timer, one end of the second resistor, and one end of the third resistor through the fourth resistor. The other ends of the second and third resistors are respectively connected to the collectors of the second and third switching transistors. The emitter of the second switching transistor is connected to the emitter of the third switching transistor, the second and sixth ends of the first timer, and the third capacitor is connected to one end of the second capacitor, the other end of the first capacitor, the second end of the power interface, the first end of the first timer, and ground. The other end of the second capacitor is connected to the fifth end of the first timer.
[0014] As a further improvement of this utility model: the path switching module includes a first counter, a first switching transistor, and a first resistor;
[0015] Preferably, the VCC terminal of the first counter is connected to the first terminal of the power interface and the collector of the first switching transistor, the Q4 terminal of the first counter is connected to the base of the first switching transistor, and the emitter of the first switching transistor is connected to the R terminal of the first counter and connected to the ground terminal, the GND terminal and the EN terminal of the first counter through the first resistor.
[0016] As a further improvement of this utility model: the protection board detection module includes a first analog switch, a first interface, a second interface and a third interface;
[0017] Preferably, the IN1, IN2 and IN3 terminals of the first analog switch are connected to the first interface, the second interface and the third interface respectively; the CTRL1, CTRL2 and CTRL3 terminals of the first analog switch are connected to the Q0, Q1 and Q2 terminals of the first counter respectively; and the OUT1, OUT2 and OUT3 terminals of the first analog switch are connected to the anomaly detection module.
[0018] As a further embodiment of this utility model: the signal processing module includes a first diode, a fifth diode, a first logic chip, and a first inverter;
[0019] Preferably, the anode of the first diode is connected to the Q4 terminal of the first counter, the cathode of the first diode is connected to the B terminal of the first logic chip and the cathode of the fifth diode, the anode of the fifth diode is connected to the Y terminal of the first logic chip, the input terminal of the first inverter and the base of the third switch, the base of the second switch is connected to the output terminal of the first inverter, and the A terminal of the first logic chip is connected to the anomaly detection module.
[0020] As a further embodiment of this utility model: the anomaly detection module includes a fifth resistor, a sixth resistor, an overvoltage detection device, an undervoltage detection device, a second diode, a third diode, a fourth diode, a second logic chip, and a first power supply;
[0021] Preferably, one end of the fifth resistor is connected to the OUT1, OUT2 and OUT3 terminals of the first analog switch, and the other end of the fifth resistor is connected to the input terminals of the overvoltage detection device and the undervoltage detection device and grounded through the sixth resistor. The output terminals of the overvoltage detection device and the undervoltage detection device are respectively connected to the anode of the second diode and the anode of the third diode. The cathode of the second diode is connected to the cathode of the third diode, the cathode of the fourth diode and the A terminal of the second logic chip. The B terminal of the second logic chip is connected to the first power supply, and the Y terminal of the second logic chip is connected to the anode of the fourth diode and the A terminal of the first logic chip.
[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: The intelligent detection circuit for multi-string lithium battery protection boards of this utility model can automatically control the connection status between the protection board detection module and the three sets of lithium battery protection boards through a timing module and a path switching module, thereby realizing automatic detection of the three sets of lithium battery protection boards. The abnormal detection module judges the overvoltage or undervoltage of the signal transmitted by the protection board detection module. When overvoltage or undervoltage occurs and the three sets of lithium battery protection boards are re-detected, the signal processing module will adjust the timing time set by the timing module to change the detection time of the protection board detection module for a single lithium battery protection board, thereby improving the detection accuracy and avoiding false detection. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a schematic block diagram of the principle of an intelligent detection circuit for a multi-string lithium battery protection board, which is provided as an example of this utility model.
[0025] Figure 2 A circuit diagram of an intelligent detection circuit for a multi-string lithium battery protection board provided for this utility model embodiment.
[0026] Figure 3 The connection circuit diagram of the anomaly detection module provided for this utility model embodiment. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] In one embodiment, see Figure 1 A multi-string lithium battery protection board intelligent detection circuit includes: a power module 1, a timing module 2, a path switching module 3, a protection board detection module 4, an anomaly detection module 5, and a signal processing module 6.
[0029] Specifically, power module 1 is used to connect to DC power;
[0030] The timing module 2 is connected to the power supply module 1 and the signal processing module 6. It is used to set the timing time and provide pulse signals at regular intervals when receiving the first control signal output by the signal processing module 6, and to adjust the timing time when receiving the second control signal output by the signal processing module 6.
[0031] The path switching module 3 is connected to the power supply module 1 and the timing module 2. It is used to output the first path signal when the pulse signal is received for the first time, the second path signal when the pulse signal is received for the second time, the third path signal when the pulse signal is received for the third time, and the fourth path signal and reset control when the pulse signal is received for the fourth time.
[0032] The protection board detection module 4 is connected to the path switching module 3 and the anomaly detection module 5. It is used to connect to the voltage sampling terminals of the three sets of lithium battery protection boards and output the first detection signal, the second detection signal and the third detection signal respectively. When the first path signal is received, the first detection signal is transmitted to the anomaly detection module 5. When the second path signal is received, the second detection signal is transmitted to the anomaly detection module 5. When the third path signal is received, the third detection signal is transmitted to the anomaly detection module 5.
[0033] The anomaly detection module 5 is used to sample the voltage of the input first detection signal, second detection signal or third detection signal and detect overvoltage or undervoltage, and to output the third control signal in the event of overvoltage or undervoltage.
[0034] The signal processing module 6 is connected to the path switching module 3 and the anomaly detection module 5. It is used to provide a first control signal and, upon receiving a third control signal and a fourth path signal, self-locks and outputs a second control signal.
[0035] In a specific embodiment, the power module 1 can be a power circuit composed of a power interface and a capacitor, and can be connected to DC power; the timing module 2 can be a timing circuit composed of a timer, a transistor, a resistor, etc., which can set the timing time and output pulse signals at regular intervals, and the timing time can be adjusted by the signal processing module 6; the path switching module 3 can be a general switching circuit composed of a counter, a transistor, and a resistor, which can output the first path signal, the second path signal, the third path signal, and the fourth path signal sequentially according to the number of pulse signals output by the timing module 2, and perform a reset process when outputting the fourth path signal; The aforementioned protection board detection module 4 can be a protection board detection circuit composed of analog switches and interfaces, which can be connected to three sets of lithium battery protection boards and perform signal interface, and switch the signal transmission path; the aforementioned abnormal detection module 5 can be an abnormal detection circuit composed of voltage, overvoltage detection device, undervoltage detection device, logic chip, etc., which can perform voltage sampling, overvoltage and undervoltage detection on the input signal, and perform signal self-locking processing when overvoltage or undervoltage occurs; the aforementioned signal processing module 6 can be a signal processing circuit composed of logic chip, diode and inverter, which can perform logic calculation, self-locking processing and inversion processing on the input signal.
[0036] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The power module 1 includes a power interface and a first capacitor C1; the timing module 2 includes a first timer IC3, a fourth resistor R4, a second resistor R2, a third resistor R3, a second switch V2, a third switch V3, a third capacitor C3, and a second capacitor C2.
[0037] Specifically, the first end of the power interface is connected to one end of the first capacitor C1, the fourth and eighth ends of the first timer IC3, and the seventh end of the first timer IC3, one end of the second resistor R2, and one end of the third resistor R3 via the fourth resistor R4. The other ends of the second resistor R2 and the third resistor R3 are respectively connected to the collector of the second switch V2 and the collector of the third switch V3. The emitter of the second switch V2 is connected to the emitter of the third switch V3, the second and sixth ends of the first timer IC3, and the third capacitor C3 is connected to one end of the second capacitor C2, the other end of the first capacitor C1, the second end of the power interface, the first end of the first timer IC3, and the ground. The other end of the second capacitor C2 is connected to the fifth end of the first timer IC3.
[0038] In a specific embodiment, the first timer IC3 can be an NE555 chip; the timing time set by the second resistor R2 and the switching transistor is compared with the timing time set by the third resistor R3 and the third switching transistor V3, wherein both the second switching transistor V2 and the third switching transistor V3 can be NPN transistors.
[0039] Furthermore, the path switching module 3 includes a first counter IC2, a first switch V1, and a first resistor R1;
[0040] Specifically, the VCC terminal of the first counter IC2 is connected to the first terminal of the power interface and the collector of the first switching transistor V1, the Q4 terminal of the first counter IC2 is connected to the base of the first switching transistor V1, and the emitter of the first switching transistor V1 is connected to the R terminal of the first counter IC2 and connected to the ground terminal, the GND terminal and the EN terminal of the first counter IC2 through the first resistor R1.
[0041] In a specific embodiment, the first counter IC2 can be a CD4017 chip; the first switch V1 can be an NPN transistor.
[0042] Furthermore, the protection board detection module 4 includes a first analog switch IC1, a first interface, a second interface, and a third interface;
[0043] Specifically, the IN1, IN2 and IN3 terminals of the first analog switch IC1 are connected to the first interface, the second interface and the third interface respectively; the CTRL1, CTRL2 and CTRL3 terminals of the first analog switch IC1 are connected to the Q0, Q1 and Q2 terminals of the first counter IC2 respectively; and the OUT1, OUT2 and OUT3 terminals of the first analog switch IC1 are connected to the anomaly detection module 5.
[0044] In a specific embodiment, the first analog switch IC1 can be a CD4066 chip; the first interface, the second interface and the third interface are respectively connected to different voltage sampling terminals of the lithium battery circuit board so that the voltage signal output when the interface lithium battery circuit board performs voltage sampling.
[0045] Furthermore, the signal processing module 6 includes a first diode D1, a fifth diode D5, a first logic chip J1, and a first inverter INV1;
[0046] Specifically, the anode of the first diode D1 is connected to the Q4 terminal of the first counter IC2, the cathode of the first diode D1 is connected to the B terminal of the first logic chip J1 and the cathode of the fifth diode D5, the anode of the fifth diode D5 is connected to the Y terminal of the first logic chip J1, the input terminal of the first inverter INV1 and the base of the third switch V3, the base of the second switch V2 is connected to the output terminal of the first inverter INV1, and the A terminal of the first logic chip J1 is connected to the abnormal detection module 5.
[0047] In a specific embodiment, the first logic chip J1 can be an AND gate chip, which can perform self-locking processing in conjunction with the first diode D1 and the fifth diode D5; the first inverter INV1 can be a NOT gate chip.
[0048] Furthermore, the anomaly detection module 5 includes a fifth resistor R5, a sixth resistor R6, an overvoltage detection device, an undervoltage detection device, a second diode D2, a third diode D3, a fourth diode D4, a second logic chip J2, and a first power supply VCC1;
[0049] Specifically, one end of the fifth resistor R5 is connected to the OUT1, OUT2 and OUT3 terminals of the first analog switch IC1, and the other end of the fifth resistor R5 is connected to the input terminals of the overvoltage detection device and the undervoltage detection device and grounded through the sixth resistor R6. The output terminals of the overvoltage detection device and the undervoltage detection device are respectively connected to the anode of the second diode D2 and the anode of the third diode D3. The cathode of the second diode D2 is connected to the cathode of the third diode D3, the cathode of the fourth diode D4 and the A terminal of the second logic chip J2. The B terminal of the second logic chip J2 is connected to the first power supply VCC1, and the Y terminal of the second logic chip J2 is connected to the anode of the fourth diode D4 and the A terminal of the first logic chip J1.
[0050] In a specific embodiment, both the overvoltage detection device and the undervoltage detection device can be composed of a comparator, a reference power supply, and a resistor. Overvoltage detection and undervoltage detection are achieved by setting the overvoltage threshold and undervoltage threshold through the reference power supply. The second logic chip J2 can be an AND gate chip, which works with the first power supply VCC1, the second diode D2, the third diode D3, and the fourth diode D4 to perform high-level self-locking processing.
[0051] In this embodiment of an intelligent detection circuit for a multi-string lithium battery protection board, DC power is supplied through a power interface. A first capacitor C1 performs filtering. The first, second, and third interfaces are connected to the voltage sampling terminals of three sets of lithium battery protection boards, respectively. The first inverter INV1 outputs a high-level signal, i.e., a first control signal, controlling the second switch V2 to conduct. Simultaneously, the first timer IC3 is powered on and, in conjunction with the fourth resistor R4, the second resistor R2, the second switch V2, the second capacitor C2, and the third capacitor C3, outputs a pulse signal within a timing period. The first counter IC2 receives the pulse signal for the first time and outputs a first path signal from its Q0 terminal, triggering the connection of the IN1 and OUT1 terminals of the first analog switch IC1. This transmits the first detection signal from the first interface to the anomaly detection module 5. Similarly, after the timing period ends, the first timer IC3 provides a second pulse signal, triggering the IN2 and OUT2 terminals of the first analog switch IC1 to conduct, thus connecting the lithium battery protection board connected to the second interface. The second detection signal provided by the voltage sampling terminal is transmitted to the anomaly detection module 5. The first timer IC3 provides a pulse signal for the third time. The IN3 and OUT3 terminals of the first analog switch IC1 are turned on, and the third detection signal provided by the voltage sampling terminal of the lithium battery protection board connected to the third interface is transmitted to the anomaly detection module 5. The voltage is divided by the fifth resistor R5 and the sixth resistor R6. The overvoltage detection device and the undervoltage detection device perform overvoltage detection and undervoltage detection respectively. When the input signal is overvoltage or undervoltage, the second logic chip J2 outputs a high level, which is the third control signal. When the first timer IC3 outputs a pulse signal for the fourth time, the first switch V1 is turned on and the first counter IC2 is reset. At this time, the signal connected to the first interface will be retransmitted. At the same time, the first logic chip J1, together with the first diode D1 and the fifth diode D5, self-locks and outputs a high-level signal, which is the second control signal, triggering the third switch V3 to turn on, thereby adjusting the timing time and changing the transmission duration of the signal received by the first interface, the second interface, or the third interface.
[0052] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A smart detection circuit for a multi-cell lithium battery protection board, characterized in that, The intelligent detection circuit of the multi-string lithium battery protection board includes: a power module, a timing module, a path switching module, a protection board detection module, an anomaly detection module, and a signal processing module. The power module is used to connect to DC power. The timing module is connected to the power supply module and the signal processing module. It is used to set the timing time and provide pulse signals at regular intervals when receiving the first control signal output by the signal processing module, and to adjust the timing time when receiving the second control signal output by the signal processing module. The path switching module is connected to the power supply module and the timing module. It is used to output a first path signal when a pulse signal is received for the first time, output a second path signal when a pulse signal is received for the second time, output a third path signal when a pulse signal is received for the third time, and output a fourth path signal and perform reset control when a pulse signal is received for the fourth time. The protection board detection module is connected to the path switching module and the anomaly detection module. It is used to connect to the voltage sampling terminals of the three sets of lithium battery protection boards and output the first detection signal, the second detection signal and the third detection signal respectively. When the first path signal is received, the first detection signal is transmitted to the anomaly detection module. When the second path signal is received, the second detection signal is transmitted to the anomaly detection module. When the third path signal is received, the third detection signal is transmitted to the anomaly detection module. The anomaly detection module is used to perform voltage sampling and overvoltage or undervoltage detection on the input first detection signal, second detection signal or third detection signal, and to self-lock and output the third control signal when there is overvoltage or undervoltage. The signal processing module is connected to the path switching module and the anomaly detection module, and is used to provide a first control signal. When it receives a third control signal and a fourth path signal, it self-locks and outputs a second control signal.
2. The intelligent detection circuit for a multi-cell lithium battery protection board according to claim 1, characterized in that, The power module includes a power interface and a first capacitor; the timing module includes a first timer, a fourth resistor, a second resistor, a third resistor, a second switching transistor, a third switching transistor, a third capacitor, and a second capacitor. The first end of the power interface is connected to one end of the first capacitor, the fourth and eighth ends of the first timer, and the seventh end of the first timer, one end of the second resistor, and one end of the third resistor through the fourth resistor. The other ends of the second and third resistors are respectively connected to the collectors of the second and third switching transistors. The emitter of the second switching transistor is connected to the emitter of the third switching transistor, the second and sixth ends of the first timer, and the third capacitor is connected to one end of the second capacitor, the other end of the first capacitor, the second end of the power interface, the first end of the first timer, and ground. The other end of the second capacitor is connected to the fifth end of the first timer.
3. The intelligent detection circuit for a multi-cell lithium battery protection board according to claim 2, characterized in that, The path switching module includes a first counter, a first switching transistor, and a first resistor; The VCC terminal of the first counter is connected to the first terminal of the power interface and the collector of the first switching transistor. The Q4 terminal of the first counter is connected to the base of the first switching transistor. The emitter of the first switching transistor is connected to the R terminal of the first counter and connected to the ground terminal, the GND terminal of the first counter, and the EN terminal through the first resistor.
4. The intelligent detection circuit for a multi-cell lithium battery protection board according to claim 3, characterized in that, The protection board detection module includes a first analog switch, a first interface, a second interface, and a third interface; The IN1, IN2 and IN3 terminals of the first analog switch are connected to the first interface, the second interface and the third interface respectively. The CTRL1, CTRL2 and CTRL3 terminals of the first analog switch are connected to the Q0, Q1 and Q2 terminals of the first counter respectively. The OUT1, OUT2 and OUT3 terminals of the first analog switch are connected to the anomaly detection module.
5. The intelligent detection circuit for a multi-cell lithium battery protection board according to claim 4, characterized in that, The signal processing module includes a first diode, a fifth diode, a first logic chip, and a first inverter; The anode of the first diode is connected to the Q4 terminal of the first counter, the cathode of the first diode is connected to the B terminal of the first logic chip and the cathode of the fifth diode, the anode of the fifth diode is connected to the Y terminal of the first logic chip, the input terminal of the first inverter and the base of the third switch, the base of the second switch is connected to the output terminal of the first inverter, and the A terminal of the first logic chip is connected to the anomaly detection module.
6. The intelligent detection circuit for a multi-cell lithium battery protection board according to claim 5, characterized in that, The anomaly detection module includes a fifth resistor, a sixth resistor, an overvoltage detection device, an undervoltage detection device, a second diode, a third diode, a fourth diode, a second logic chip, and a first power supply. One end of the fifth resistor is connected to the OUT1, OUT2 and OUT3 terminals of the first analog switch. The other end of the fifth resistor is connected to the input terminals of the overvoltage detection device and the undervoltage detection device and grounded through the sixth resistor. The output terminals of the overvoltage detection device and the undervoltage detection device are respectively connected to the anode of the second diode and the anode of the third diode. The cathode of the second diode is connected to the cathode of the third diode, the cathode of the fourth diode and the A terminal of the second logic chip. The B terminal of the second logic chip is connected to the first power supply. The Y terminal of the second logic chip is connected to the anode of the fourth diode and the A terminal of the first logic chip.