CN220894486U

CN220894486U - Battery polarity detection protection circuit and detection device

Info

Publication number: CN220894486U
Application number: CN202322768340.6U
Authority: CN
Inventors: 黄万; 陈志勇; 刘军; 张征
Original assignee: Guangdong Mic Power New Energy Co Ltd
Current assignee: Guangdong Mic Power New Energy Co Ltd
Priority date: 2023-10-16
Filing date: 2023-10-16
Publication date: 2024-05-03
Anticipated expiration: 2033-10-16

Abstract

The application provides a battery polarity detection protection circuit and a detection device, wherein the circuit mainly comprises: the system comprises a detection module, an alarm module and an analog switch module; the detection module comprises a first detection module and a second detection module; the battery presets the positive pole end and is connected with one end of first detection module, one end of alarm module, one end of second detection module and one end of analog switch module respectively, and the battery presets the negative pole end and is connected with the other end of first detection module, the other end of alarm module, the other end of second detection module and the other end of analog switch module respectively. According to the application, whether the polarity of the current output is correct or not is detected, and when the polarity of the plug-in wire of the battery module is reversed, the LED in the detection module lights up a red light and is matched with a buzzer prompt. The application can not only prevent the bad burn-out test equipment of the reverse connection of the plug-in wire, but also automatically identify the bad products with reverse polarity of the plug-in wire without adding additional working procedures, thereby greatly improving the detection efficiency and reducing the production cost.

Description

Battery polarity detection protection circuit and detection device

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a battery polarity detection protection circuit and a battery polarity detection device.

Background

After the lithium ion battery module is assembled, the input and output ends of the BMS are required to be connected with external devices by using 2 groups of plug-in wires, only 1 group of plug-in wires are required for performance test and ageing procedures, and test equipment is required to be connected during testing of the 1 group of plug-in wires; or the other 1 group of plug-in wires are required to be connected with a main control board during testing. At present, only at a finished product appearance station, whether the polarity of the positive electrode and the negative electrode of the plug-in wire terminal is correct is checked by visual inspection, and when the following two conditions occur: ① When the plug-in wires are reversely connected with the wires of the anode and the cathode, and the ② BMS welds the plug-in wires, and when the finished product test and the appearance cannot be detected, external devices can be burnt out when a client is used, so that the connection interface of the battery and the test equipment is damaged if the potential safety hazard is very large; and strong electric spark discharge is generated, the service life of the battery is seriously influenced, and even the safety of human bodies is endangered.

Disclosure of utility model

In order to overcome the defects in the prior art, the application provides a battery polarity detection protection circuit and a detection device, which are used for detecting whether the current output polarity is correct between a battery and external detection equipment, and when the polarity of a plug-in wire of a battery module is reversed, a red light is lightened in the detection circuit and a buzzer prompt is matched. The application can not only prevent the bad burn-out test equipment of the reverse connection of the plug-in wire, but also automatically identify the bad products with reverse polarity of the plug-in wire without adding additional working procedures, thereby greatly improving the detection efficiency and reducing the production cost.

In order to achieve the above object, the present application provides a battery polarity detection protection circuit, comprising:

The system comprises a detection module, an alarm module and an analog switch module; the detection module comprises a first detection module and a second detection module.

The battery presets the positive pole end and is connected with one end of first detection module, one end of alarm module, one end of second detection module and one end of analog switch module respectively, and the battery presets the negative pole end and is connected with the other end of first detection module, the other end of alarm module, the other end of second detection module and the other end of analog switch module respectively.

One end of the analog switch module is also connected with the positive electrode end of the external test equipment, and the other end of the analog switch module is also connected with the negative electrode end of the external test equipment.

In the present utility model, the first detection module includes a light emitting diode Z1, a resistor R1, and a diode D1.

Further, the negative electrode of the light emitting diode Z1 is connected with the preset positive electrode end of the battery, the positive electrode of the light emitting diode Z1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected with the preset negative electrode end of the battery.

In the utility model, the alarm module comprises a triode Q1, an alarm B1, a resistor R2, a resistor R3 and a resistor R4.

Further, the emitter of the triode Q1 is connected with the preset positive electrode end of the battery, the collector of the triode Q1 is connected with the negative electrode of the alarm B1, the positive electrode of the alarm B1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with one end of the resistor R4, the other end of the resistor R4 is connected with the base electrode of the triode Q1, the other end of the resistor R4 is further connected with one end of the resistor R3, the other end of the resistor R3 is connected with the preset positive electrode end of the battery, and the other end of the resistor R2 is further connected with the negative electrode of the diode D1.

In the present utility model, the second detection module includes: light emitting diode Z2, diode D2, resistor R5, resistor R6, and resistor R7.

Further, the positive electrode of the diode D2 is connected with the preset positive electrode end of the battery, the negative electrode of the diode D2 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with the positive electrode of the light emitting diode Z2, the negative electrode of the light emitting diode Z2 is connected with the preset negative electrode end of the battery, the negative electrode of the diode D2 is also connected with one end of the resistor R6, the other end of the resistor R6 is connected with one end of the resistor R7, and the other end of the resistor R7 is connected with the preset negative electrode end of the battery.

In the utility model, the analog switch module comprises a relay switch K1, a relay switch K2, a diode D3 and a piezoresistor R8.

Further, a pin 1 of the relay switch K1 is connected with a cathode of the diode D3, an anode of the diode D3 is connected with a preset cathode end of the battery, a pin 1 of the relay switch K2 is connected with one end of the piezoresistor R8, and the other end of the piezoresistor R8 is connected with the preset cathode end of the battery.

The preset positive electrode end of the battery is respectively connected with a pin 2 of the relay switch K1 and a pin 2 of the relay switch K2; the positive electrode end of the external test equipment is respectively connected with the pin 3 of the relay switch K1 and the pin 3 of the relay switch K2; the preset negative electrode end of the battery is respectively connected with a pin 5 of the relay switch K1 and a pin 5 of the relay switch K2.

In order to achieve the above object, the present application further provides a detection device, which at least includes the polarity detection protection circuit as described above.

Compared with the prior art, the application has the beneficial effects that:

According to the battery polarity detection protection circuit and the detection device, whether the current output polarity is correct or not is detected, when the polarity is correct, the current can turn on a green light when passing through the second detection module, and meanwhile, the relay switch is attracted, the battery pack is communicated with the test equipment, and normal input and output can be realized; when polarity is wrong, the current can light the red light when passing through first detection module to alarm device can buzzing suggestion, and the relay does not inhale simultaneously, and the circuit between group battery and the test equipment is not led to, prevents that the reverse current output of group battery from leading to equipment damage to equipment. The application can not only prevent the bad burn-out test equipment of the reverse connection of the plug-in wire, but also automatically identify the bad products with reverse polarity of the plug-in wire without adding additional working procedures, thereby greatly improving the detection efficiency and reducing the production cost. In addition, the detection test is not carried out when the battery and the connecting equipment end are not output, and the energy consumption is low on the basis of low cost.

Drawings

Fig. 1 is a schematic diagram of a battery polarity detection protection circuit according to an embodiment of the application.

Fig. 2 is a circuit configuration diagram of a battery polarity detection protection circuit according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions will be clearly and completely described below in connection with the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Embodiment one:

as shown in fig. 1, in order to solve the above technical problem, the present utility model provides a battery polarity detection protection circuit, including:

It should be noted that, the battery polarity detection protection circuit of the present utility model mainly comprises a detection module with normal polarity, a detection module with abnormal polarity, an alarm module and an analog switch module, when the polarity is detected to be normal, the alarm module is not started, and the relay module in the analog switch module is kept to be attracted unchanged; when the polarity is abnormal, the alarm module can start a buzzing prompt, and the relay module in the analog switch module can be switched to be not in attraction, so that the battery and the test equipment interface and the circuit are protected in time.

The battery preset positive terminal is respectively connected with one end of the first detection module, one end of the alarm module, one end of the second detection module and one end of the analog switch module, and the battery preset negative terminal is respectively connected with the other end of the first detection module, the other end of the alarm module, the other end of the second detection module and the other end of the analog switch module.

It should be noted that, the preset positive terminal and the preset negative terminal of the battery are set according to the factory product of the plug-in wire of the battery before the test is performed, if the detection module displays normal, the preset positive terminal of the battery is the positive terminal of the battery; otherwise, if the detection module shows abnormality, the preset positive end of the battery is the negative end of the battery, that is, the battery product belongs to defective products, defective products are reduced from flowing into the market, and the safety risk is greatly reduced.

Preferably, the type of the light emitting diode Z1 is selected as a red indicator light LED1, the rated voltage is 2V, and the maximum continuous reverse voltage is 5V. The resistance value of the selection resistor R1 is 10kΩ; according to ohm's law, when LED1 is on, the current through the LED is about (36V-2V)/10kΩ=3.4 mA. And, the model of the diode D1 is selected to be 1N4148, the maximum reverse voltage is 100V, and the maximum reverse leakage current is 10 μa.

The negative electrode of the LED1 is connected to the positive electrode of the battery, the positive electrode of the LED1 is connected to one end of the R1, the other end of the R1 is connected to the negative electrode of the D1, and the positive electrode of the D1 is connected to the negative electrode of the battery.

Then, the anode of the LED1 is connected to the cathode of the battery, and the cathode of the LED1 is connected to the anode of the battery through the current limiting resistor R1. The resistance of R1 ensures that the current of LED1 is within the nominal range when turned on in reverse. Thus, when the polarity is connected, the LED1 is not conducted, meanwhile, the D1 is not conducted, the leakage current is small, and the LED is not damaged; when the polarity is reversed, the LED1 is turned on to emit red light.

Preferably, R2 may employ a metal film resistance of 1kΩ; r3 can adopt a metal film resistor of 10k omega; r4 may employ a metal film resistance of 100deg.C.

Wherein, R2 is connected in series with the buzzer, plays the current limiting effect, and 1kΩ can restrict the electric current in several milliamperes scope. R3 provides stable base bias voltage, and 10kΩ can play a good role in bias. R4 is used to limit the base current to prevent damage to the transistor, and 100deg.C can be limited to 1-2mA. In addition, the three materials select common metal film resistor, the power level is 0.25W, and the precision is +/-5% so as to meet the use requirement.

The triode Q1 is an NPN triode, the emitter is connected with the positive electrode of the battery, and the collector is connected with the negative electrode of the buzzer B1. The positive pole of the buzzer B1 is connected to the base electrode of the Q1 through a resistor R2. The base electrode of Q1 is connected to the positive electrode of the battery through R4 and R3. The other end of R2 is also connected to the cathode of the first detection module diode D1.

Then, when the battery polarity is connected: d1 is turned off reversely, Q1 is also in the off state, and the buzzer does not sound. When the polarity of the battery is reversed: the base electrode of the Q1 is connected to the negative electrode through the R2 and the D1 to form forward bias, the Q1 is conducted, and the buzzer sounds.

That is, the alarm module can send out an alarm when the battery is connected reversely, so as to remind the user that the polarity is connected reversely. Wherein R3 provides stable bias of the base of Q1, and R4 is used for current limiting protection of the base of Q1.

Through the linkage with the first detection module, the buzzer alarm function when the polarity is abnormal can be realized.

When the positive electrode of the battery is connected to the circuit, the positive electrode of the diode D2 is connected to the positive electrode of the battery, and the current can be conducted through the diode D2. After the D2 diode is conducted, current passes through the R5 resistor, so that the anode of the light-emitting diode Z2 is connected, and the Z2 light-emitting diode is lightened.

Meanwhile, the current passes through the cathode of the D2 diode and the R6 resistor, and then returns to the cathode of the battery through the R7 resistor. And the R6 and R7 resistors form a current loop, so that the D2 diode and the Z2 light-emitting diode can work normally.

When the battery cathode is connected to the circuit, the D2 diode cannot be conducted, and the Z2 light-emitting diode cannot be lightened.

Therefore, when the battery is being connected, the Z2 light emitting diode is lightened to indicate that the polarity of the battery is correct; when the battery is reversely connected, Z2 is not bright, and the polarity of the battery is wrong.

Preferably, the light emitting diode Z2 is selected to be a green dome indicator lamp LED2 rated at approximately 2.1V. The selection resistor R5 is a metal film resistor of 10kΩ. Diode D2 is selected to be a 1N4148 signal diode with a maximum reverse voltage of 100V.

The positive electrode of D2 is connected to the positive electrode of the battery, the negative electrode is connected to the positive electrode of LED2 through R5, and the negative electrode of LED2 is connected to the negative electrode of the battery. D2 negative electrode is also connected to battery negative electrode through R6, R7. R6 and R7 are bias stabilization resistors.

Then, when the battery positive polarity connection timing: d2 is turned on and LED2 lights up, indicating that the battery polarity is normal. When the battery is connected in reverse: d2 is turned off in reverse, LED2 is not lit, indicating that the battery polarity is abnormal.

Thus, the battery polarity can be detected by the on/off of the LED 2. R5 current limiting protects the LEDs. D2 prevents reverse high voltage damage.

Preferably, the selection relay may be Songle SRD-05VDC-SL-C, operating voltage 5VDC, contact rating 1A 125VAC. Diode D3 is selected to be 1N4148, with a maximum reverse voltage of 100V. The piezoresistor R8 is selected as a carbon film resistor with the resistance value of 10kΩ.

When the polarity is normal, D3 and R8 are turned on, and the coils K1 and K2 are energized to attract the contacts. When the polarities are reversed, the coils D3 and R8 are not conducted, the coils K1 and K2 are not electrified, and the contact is disconnected.

The function of the protection circuit is realized through the conduction of the actuation state control circuit of the relay.

In summary, an embodiment pair of the battery polarity detection protection circuit provided by the utility model is used for detecting whether the output polarity of the current is correct, when the polarity is correct, the current can turn on a green light when passing through the second detection module, and meanwhile, the relay switch is attracted, the battery pack is communicated with the test equipment, and the input and output can be normally carried out; when polarity is wrong, the current can light the red light when passing through first detection module to alarm device can buzzing suggestion, and the relay does not inhale simultaneously, and the circuit between group battery and the test equipment is not led to, prevents that the reverse current output of group battery from leading to equipment damage to equipment.

Embodiment two:

In order to solve the above technical problems, the present utility model further provides a detection device, and the circuit structure of the battery protection board at least includes the battery polarity detection protection circuit.

Preferably, the battery polarity detection protection circuit in the first embodiment is designed as a detection device for detecting the polarity of the battery pack. The detection device can be designed as follows:

And packaging the detection protection circuit with an insulating shell to form an independent detection module, and exposing the detection terminal. The detection terminal is designed into a socket or a clamp which is matched with batteries with different specifications. A display unit comprising an indicator light and an LCD screen can be added to display the detection result in real time. And an alarm unit comprising a buzzer and a vibration unit is added, and an alarm is sent out when an error is detected. Control buttons are added to manually control the detection process. And a power supply module is added to provide the detection circuit and the display and alarm module with the required working voltage.

Finally, all the components are installed in a plastic chassis, and detection terminals, buttons, a display screen and the like are exposed on the chassis through openings. Different models can be designed and different types of batteries can be adapted.

In summary, the detection device according to the second embodiment is an application embodiment of the first embodiment, and the detection device obtained according to the above design can be used by a user conveniently, quickly detect the polarity of the battery pack, ensure correct use, avoid equipment damage, and have low production cost. The specific circuit structure implementation process and principle are described in detail in the first embodiment, and are not described in detail in this embodiment.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.

Claims

1. A battery polarity detection protection circuit, comprising:

The system comprises a detection module, an alarm module and an analog switch module; the detection module comprises a first detection module and a second detection module;

The battery preset positive electrode end is respectively connected with one end of the first detection module, one end of the alarm module, one end of the second detection module and one end of the analog switch module, and the battery preset negative electrode end is respectively connected with the other end of the first detection module, the other end of the alarm module, the other end of the second detection module and the other end of the analog switch module;

2. The battery polarity detection protection circuit of claim 1 wherein,

The first detection module comprises a light emitting diode Z1, a resistor R1 and a diode D1.

3. A battery polarity detection protection circuit according to claim 2, wherein,

The negative electrode of the light emitting diode Z1 is connected with the preset positive electrode end of the battery, the positive electrode of the light emitting diode Z1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected with the preset negative electrode end of the battery.

4. A battery polarity detection protection circuit according to claim 3, wherein,

The alarm module comprises a triode Q1, an alarm B1, a resistor R2, a resistor R3 and a resistor R4.

5. The battery polarity detection protection circuit of claim 4 wherein,

The emitter of triode Q1 with anodal end is connected in advance to the battery, and triode Q1's collecting electrode is connected with alarm B1's negative pole, and alarm B1's positive pole is connected with resistance R2's one end, and resistance R2's the other end is connected with resistance R4's one end, and resistance R4's the other end is connected with triode Q1's base, resistance R4's the other end still is connected with resistance R3's one end, resistance R3's the other end with anodal end is connected in advance to the battery, resistance R2's the other end still with diode D1's negative pole is connected.

6. The battery polarity detection protection circuit of claim 5 wherein,

The second detection module includes: light emitting diode Z2, diode D2, resistor R5, resistor R6, and resistor R7.

7. The battery polarity detection protection circuit of claim 6 wherein,

The positive pole of diode D2 with the battery presets anodal end and is connected, diode D2's negative pole and resistance R5's one end is connected, and resistance R5's the other end is connected with the positive pole of emitting diode Z2, emitting diode Z2's negative pole with the battery presets the negative pole end and is connected, diode D2's negative pole still is connected with resistance R6's one end, and resistance R6's the other end is connected with resistance R7's one end, resistance R7's the other end with the battery presets the negative pole end and is connected.

8. The battery polarity detection protection circuit of claim 7 wherein,

The analog switch module comprises a relay switch K1, a relay switch K2, a diode D3 and a piezoresistor R8.

9. The battery polarity detection protection circuit of claim 8 wherein,

The pin 1 of the relay switch K1 is connected with the cathode of the diode D3, the anode of the diode D3 is connected with the preset cathode end of the battery, the pin 1 of the relay switch K2 is connected with one end of the piezoresistor R8, and the other end of the piezoresistor R8 is connected with the preset cathode end of the battery;

The preset positive electrode end of the battery is respectively connected with a pin 2 of the relay switch K1 and a pin 2 of the relay switch K2;

The positive electrode end of the external test equipment is respectively connected with the pin 3 of the relay switch K1 and the pin 3 of the relay switch K2;

the preset negative electrode end of the battery is respectively connected with a pin 5 of the relay switch K1 and a pin 5 of the relay switch K2.

10. A detection device, characterized in that the detection device at least comprises a polarity detection protection circuit according to any one of claims 1 to 9.