CN220307125U

CN220307125U - BMS temperature difference feedback circuit

Info

Publication number: CN220307125U
Application number: CN202321968675.6U
Authority: CN
Inventors: 杨翔宇; 郭庆明; 蔡嘉仕; 徐鸿浩
Original assignee: Huizhou Desai Intelligent Storage Technology Co ltd
Current assignee: Huizhou Desai Intelligent Storage Technology Co ltd
Priority date: 2023-07-25
Filing date: 2023-07-25
Publication date: 2024-01-05
Anticipated expiration: 2033-07-25

Abstract

The utility model discloses a BMS temperature difference feedback circuit, which mainly comprises: the device comprises a thermoelectric generation module, an analog switch circuit and a switch control module; the positive pole of the thermoelectric generation module is connected with the input end of the analog switch circuit, the negative pole of the thermoelectric generation module is grounded, and the output end of the analog switch circuit is connected with one end of the switch control module. According to the utility model, the temperature difference inside and outside the battery module is increased continuously in the operation process of the battery module, the voltage generated by the temperature difference power generation module according to the temperature difference is increased, when the voltage reaches the preset voltage value, the temperature difference feedback module outputs a feedback signal, and the switch control module receives the feedback signal, so that the external refrigeration module is controlled to dissipate heat, the effect of controllably reducing the temperature difference is achieved, the timely heat dissipation of the battery module is facilitated, the safe and reliable normal operation is realized, the service life of the battery module is greatly prolonged, and the production cost is reduced.

Description

BMS temperature difference feedback circuit

Technical Field

The utility model relates to the technical field of temperature difference feedback circuits, in particular to a BMS temperature difference feedback circuit.

Background

Battery Management Systems (BMS) play a critical role in modern battery applications for monitoring, controlling and protecting battery packs. However, since the battery generates heat during the charge and discharge process, if heat cannot be dissipated in time, the battery may overheat, damage or even fire disaster may occur. In order to solve this problem, various heat dissipation techniques such as conductive heat dissipation and a driven fan have been proposed. However, these heat dissipation techniques have some limitations in practical applications. First, they typically require the reliance on external energy sources for heat dissipation, increasing the complexity and energy consumption of the system. Secondly, they often can't the inside and outside temperature difference of real-time perception group battery, can't control the heat dissipation process accurately, often can lead to the life of battery module to reduce, increase radiating energy loss, even bring certain potential safety hazard.

Disclosure of Invention

To the defect of above-mentioned prior art, this application provides a BMS difference in temperature feedback circuit, this design circuit utilizes battery module long-time operation to generate heat, and the different principle of generating voltage according to the difference in temperature, when voltage reaches the preset voltage value along with the improvement of the inside and outside difference in temperature of battery module in the analog switch circuit, after the switch control module receives the feedback signal of analog switch circuit output, enable control external refrigeration module dispels the heat, reach the effect of controllably reducing the difference in temperature, be favorable to the timely heat dissipation of battery module, thereby safe and reliable normal operating, and the security performance and the life of battery module have been improved greatly, reduce manufacturing cost.

To achieve the above object, the present application provides a BMS temperature difference feedback circuit, including: the device comprises a thermoelectric generation module, an analog switch circuit and a switch control module.

The positive electrode of the thermoelectric power generation module is connected with the input end of the analog switch circuit, the negative electrode of the thermoelectric power generation module is grounded, and the output end of the analog switch circuit is connected with one end of the switch control module.

Optionally, the analog switching circuit includes: resistor R1, resistor R3, resistor R5, and transistor Q1.

In the application, one end of a resistor R3 is connected with the positive electrode of the thermoelectric generation module, the other end of the resistor R3 is connected with one end of a resistor R5, and the other end of the resistor R5 is grounded; the other end of the resistor R3 is also connected with the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected with one end of the resistor R1, and the other end of the resistor R1 is connected with a 3.3V power supply; and the collector electrode of the triode Q1 is also connected with one end of the switch control module, and the emitter electrode of the triode Q1 is grounded.

According to the temperature difference control circuit, the difference of the resistances of the base series resistor R3 and the bias resistor R5 of the triode Q1 is utilized, so that the threshold voltage of the conduction of the triode Q1 can be set to be a value in a certain range, when the voltage of the temperature difference power generation module exceeds the threshold voltage, the triode Q1 is conducted and then a feedback signal is output to the switch control module, the voltage at one end of the switch control module is changed from a high level to a low level, the switch control module receives the feedback signal with overlarge temperature difference and drives the external refrigeration module to dissipate heat, and the effect of controllably reducing the temperature difference is achieved.

Optionally, another said analog switching circuit comprises: resistor R2, resistor R4, zener diode D1 and transistor Q2.

In the application, the cathode of the voltage stabilizing diode D1 is connected with the anode of the thermoelectric generation module, the anode of the voltage stabilizing diode D1 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the base electrode of a triode Q2, and the emitter electrode of the triode Q2 is grounded; the collector of the triode Q2 is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a 3.3V power supply; and the collector electrode of the triode Q2 is also connected with one end of the switch control module.

The characteristic of zener diode D1 can also be utilized in the design circuit, when the power generation voltage of thermoelectric generation module does not surpass zener diode's steady voltage value, triode Q2's base does not pass through the electric current, then triode Q2 does not switch on, when thermoelectric generation module's power generation voltage is about 0.7V bigger than zener diode D1's steady voltage value, zener diode switches on, at this moment, triode Q2's base has the electric current to pass through, drive triode Q2 switches on, then to switch control module output feedback signal, switch control module one end department voltage becomes low level by the high level, switch control module just receives the too big feedback signal of difference in temperature, external refrigeration module of redrive dispels the heat, this design has also reached the effect of controllably reducing the difference in temperature.

Optionally, another said analog switching circuit comprises: resistor R6, resistor R7, resistor R8, and comparator U1.

In the application, a positive input end pin 3 of a comparator U1 is connected with the positive electrode of the thermoelectric generation module, a negative input end pin 2 of the comparator U1 is connected with one end of a resistor R7, and the other end of the resistor R7 is grounded; the negative input end pin 2 of the comparator U1 is also connected with one end of a resistor R8, and the other end of the resistor R8 is connected with a 3.3V power supply; the power supply positive terminal pin 4 of the comparator U1 is grounded, the power supply negative terminal pin 8 of the comparator U1 is connected with the other end of the resistor R8, and the power supply negative terminal pin 8 of the comparator U1 is connected with a 3.3V power supply; the output terminal pin 1 of the comparator U1 is connected with one end of a resistor R6, the other end of the resistor R6 is grounded, and the output terminal pin 1 of the comparator U1 is also connected with one end of the switch control module.

The voltage of the in-phase amplifying end of the comparator U1 is higher than the voltage of the anti-phase amplifying end when the power generation voltage of the thermoelectric power generation module rises to be higher than the voltage division between the R7 and the R8, the output voltage of the comparator is changed from low level to high level, then a feedback signal is output to the switch control module, the voltage at one end of the switch control module is changed from high level to low level, the switch control module receives the feedback signal with overlarge temperature difference and drives the external refrigeration module to dissipate heat, and the effect of controllably reducing the temperature difference is achieved by the design.

Alternatively, on the basis that another analog switch circuit includes a resistor R6, a resistor R7, a resistor R8, and a comparator U1, the connection position of the resistor R7 and the resistor R8 in the analog switch circuit may be changed to constitute a voltage division loop.

The positive input pin 3 of the comparator U1 is connected with one end of a resistor R7, the other end of the resistor R7 is grounded, the positive input pin 3 of the comparator U1 is also connected with one end of a resistor R8, and the other end of the resistor R8 is connected with the positive electrode of the thermoelectric generation module; the negative input end pin 2 of the comparator U1 is grounded, the positive power end pin 4 of the comparator U1 is grounded, and the negative power end pin 8 of the comparator U1 is connected with a 3.3V power supply; the output terminal pin 1 of the comparator U1 is connected with one end of a resistor R6, the other end of the resistor R6 is grounded, and the output terminal pin 1 of the comparator U1 is also connected with one end of the switch control module.

The positive and negative ends of the thermoelectric generation module are designed to be connected in parallel through two resistors, a voltage dividing loop is formed, the voltage at the positive amplifying end of the comparator U1 is changed by changing the resistance value of the resistor, the output voltage of the thermoelectric generation module can be larger than that of a power supply 3.3V, the output voltage of the comparator U1 is changed from low level to high level, then a feedback signal is output to the switch control module, the voltage at one end of the switch control module is changed from high level to low level, the switch control module receives the feedback signal with overlarge temperature difference and drives the external refrigeration module to dissipate heat, and the effect of controllably reducing the temperature difference is achieved by the design.

To achieve the above object, the present application further provides a BMS temperature difference feedback device, including:

and the battery module generates heat in the operation process.

The thermoelectric power generation module is used for generating power generation voltage according to the temperature difference inside and outside the battery module.

And the temperature difference feedback module is electrically connected with the temperature difference power generation module and is used for outputting a feedback signal when the power generation voltage reaches a preset voltage value.

And the switch control module is electrically connected with the temperature difference feedback module and is used for receiving the feedback signal so as to control the external refrigeration module to dissipate heat and realize controllable temperature difference reduction.

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

the BMS temperature difference feedback circuit provided by the utility model is mainly characterized in that: the thermoelectric power generation module generates voltage output in the operation process of the battery module by utilizing thermoelectric effect. The analog switch circuit connects the thermoelectric generation module with the switch control module, so that the MCU can sense the output voltage of the thermoelectric generation module in real time. When the output voltage of the thermoelectric generation module reaches a preset voltage value, the thermoelectric feedback module outputs a feedback signal. After receiving the feedback signal, the switch control module enables control to control the external refrigeration module to dissipate heat. The temperature difference feedback mechanism enables the BMS system to intelligently adjust the heat dissipation effect according to the actual temperature difference, and achieves more accurate and efficient heat dissipation control. Through using this kind of BMS difference in temperature feedback circuit technical scheme, can in time reduce battery module's temperature, effectively protect the safety of group battery to prolong its life. In addition, the scheme can dynamically adjust according to the actual temperature difference, so that the waste of energy sources can be avoided, the production cost is reduced, and the overall performance and reliability of the system are improved.

Drawings

Fig. 1 is a schematic structural diagram of a BMS temperature difference feedback circuit according to the present utility model.

Fig. 2 is a schematic circuit diagram of a BMS temperature difference feedback circuit according to a first embodiment of the present utility model.

Fig. 3 is a schematic circuit diagram of a BMS temperature difference feedback circuit according to a second embodiment of the present utility model.

Fig. 4 is a schematic circuit diagram of a BMS temperature difference feedback circuit according to a third embodiment of the present utility model.

Fig. 5 is a schematic circuit diagram of another BMS temperature difference feedback circuit according to a third embodiment of the present utility model.

Fig. 6 is a schematic diagram of a BMS temperature difference feedback device according to a fourth embodiment of the present utility model.

Detailed Description

For the purposes, technical solutions and advantages of the embodiments of the present application to be more apparent, 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 embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Embodiment one:

as shown in fig. 1, the present utility model provides a BMS temperature difference feedback circuit, which mainly includes: the device comprises a thermoelectric generation module, an analog switch circuit and a switch control module.

Preferably, the thermoelectric generation module may be a thermoelectric generation sheet, a thermoelectric generation plate or the like, which is not limited thereto.

Preferably, the switch control module may be a relay switch circuit, or may be a single chip microcomputer chip with a control function, for example, an MCU control module, where one end of the switch control module may be an mcu_detect pin, which is not limited thereto.

As shown in fig. 2, optionally, the analog switching circuit includes: resistor R1, resistor R3, resistor R5, and transistor Q1.

Preferably, the resistance of the resistor R1 may be 500 to 1000 ohms, the resistance of the resistor R3 may be 1000 to 2000 ohms, the resistance of the resistor R5 may be 500 to 1000 ohms, and the transistor Q1 may be selected as a transistor of SS8050 type, which is not limited thereto.

The circuit principle of the first embodiment is as follows: the difference of the resistance values of the base electrode series resistor R3 and the bias resistor R5 of the triode Q1 is utilized, so that the threshold voltage of the conduction of the triode Q1 can be set to be a value in a certain range, when the voltage of the thermoelectric generation module exceeds the threshold voltage, the triode Q1 is conducted, then a feedback signal is output to the switch control module, the voltage at one end of the switch control module is changed from a high level to a low level, the switch control module receives the feedback signal with overlarge temperature difference, and the external refrigeration module is controlled to conduct controllable heat dissipation.

In summary, in the analog switch circuit, the analog switch is formed by utilizing the difference of the resistance values of the base series resistor R3 and the bias resistor R5 of the triode Q1, and the design achieves the effect of controllably outputting a feedback signal to the switch control module.

Embodiment two:

as shown in fig. 3, in another BMS temperature difference feedback circuit provided by the present utility model, the analog switch circuit includes: resistor R2, resistor R4, zener diode D1 and transistor Q2.

Preferably, the resistance of the resistor R2 may be 500-1000 ohms, the resistance of the resistor R4 may be 500-1000 ohms, the zener diode D1 may be a zener diode of model LM7805, and the triode Q2 may be a triode of model SS8050, which are not limited thereto.

The circuit principle of the second embodiment is as follows: in the design circuit, the characteristics of a voltage stabilizing diode D1 are utilized, when the power generation voltage of the thermoelectric power generation module does not exceed the voltage stabilizing value of the voltage stabilizing diode, the base electrode of a triode Q2 does not pass current, the triode Q2 is not conducted, when the power generation voltage of the thermoelectric power generation module is about 0.7V larger than the voltage stabilizing value of the voltage stabilizing diode D1, the voltage stabilizing diode is conducted, at the moment, the base electrode of the triode Q2 passes current to drive the triode Q2 to conduct, then a feedback signal is output to a switch control module, the voltage at one end of the switch control module is changed from high level to low level, the switch control module receives the feedback signal with overlarge temperature difference, and then the external refrigeration module is controlled to conduct controllable heat dissipation,

in summary, the analog switch circuit adopts the zener diode D1 to form the analog switch, and the design also achieves the effect of controllably outputting the feedback signal to the switch control module.

Embodiment III:

as shown in fig. 4, in another BMS temperature difference feedback circuit according to the present utility model, the analog switching circuit includes: resistor R6, resistor R7, resistor R8, and comparator U1.

Preferably, the resistance of the resistor R6 may be 5000-10000 ohms, the resistance of the resistor R7 may be 500-1000 ohms, the resistance of the resistor R8 may be 500-1000 ohms, and the comparator U1 may be an operational amplifier of model LM358, which is not limited thereto.

The circuit principle of the third embodiment is as follows: the circuit design can also adopt a comparator and utilize the characteristics of the comparator, when the power generation voltage of the thermoelectric power generation module rises to be larger than the voltage division between R7 and R8, the in-phase amplification end of the comparator U1 is higher than the voltage of the anti-phase amplification end, the output voltage of the comparator is changed from low level to high level, then a feedback signal is output to the switch control module, the voltage at one end of the switch control module is changed from high level to low level, the switch control module receives the feedback signal with overlarge temperature difference, and the external refrigeration module is controlled to controllably dissipate heat.

In summary, the analog switch circuit adopts the comparator U1 to form an analog switch, and the design also achieves the effect of controllably outputting a feedback signal to the switch control module.

As shown in fig. 5, alternatively, on the basis that another analog switch circuit includes a resistor R6, a resistor R7, a resistor R8 and a comparator U1, the connection position of the resistor R7 and the resistor R8 in the analog switch circuit may be changed to form a voltage division loop.

The circuit design principle of this alternative embodiment is: the two ends of the positive electrode and the negative electrode of the thermoelectric generation module are designed to be connected in parallel to form a voltage dividing loop, the voltage at the positive amplifying end of the comparator U1 is changed by changing the resistance value of the resistor, so that the output voltage of the thermoelectric generation module can be larger than the power supply 3.3V, the output voltage of the comparator U1 is changed from low level to high level, then a feedback signal is output to the switch control module, the voltage at one end of the switch control module is changed from high level to low level, the switch control module receives the feedback signal with overlarge temperature difference, and then the external refrigeration module is driven to controllably dissipate heat.

In summary, the utility model designs the analog switch by utilizing the difference of the resistance values of the base series resistor R3 and the bias resistor R5 of the triode Q1 in the analog switch circuit, the analog switch is formed by adopting the voltage stabilizing diode D1 and the voltage stabilizing characteristic thereof, the analog switch is formed by adopting the comparator U1 and the high-low level signal of the output voltage thereof, the effect of controllably outputting a feedback signal to the switch control module is achieved by the design, and the switch control module can control the external refrigeration module to dissipate heat after receiving the feedback signal. The temperature difference feedback mechanism enables the BMS system to intelligently adjust the heat dissipation effect according to the actual temperature difference, achieves more accurate and efficient heat dissipation control, effectively protects the safety of the battery pack, and prolongs the service life of the battery pack.

Embodiment four:

as shown in fig. 6, the present utility model further provides a BMS temperature difference feedback device, which mainly includes:

battery module, thermoelectric generation module, difference in temperature feedback module and switch control module.

Preferably, the thermoelectric generation module may be selected as a thermoelectric generation sheet, the thermoelectric feedback module may be selected as an analog switch circuit composed of different circuit elements, and the thermoelectric feedback signal, for example, a zener diode with model LM7805, is output when the condition is met, which is not limited thereto.

The temperature difference power generation module, the temperature difference feedback module and the switch control module are respectively and electrically connected one by one.

Preferably, the device is applicable to battery modules in various electronic device scenes, such as lithium battery modules in automobiles or household appliances, and the like, without being limited thereto.

Preferably, the lithium battery module generates a large amount of heat during the operation for a long time, and the temperature emitted by the heat is higher and higher, and the thermoelectric power generation module generates voltage output according to the temperature difference between the inside and the outside of the battery module during the operation of the battery module by using thermoelectric effect. Generating a power generation voltage. The temperature difference feedback module is electrically connected with the temperature difference power generation module, and outputs a feedback signal when the power generation voltage reaches a preset voltage value. At this time, the switch control module receives the feedback signal, so as to control the external refrigeration module to dissipate heat, and controllably reduce the temperature difference.

Preferably, the output voltage of the thermoelectric generation module can also be used for providing an input power supply for the external refrigeration module, and the thermoelectric generation module is not limited to the input power supply.

In summary, the BMS temperature difference feedback device provided in the fourth embodiment can dynamically adjust according to the actual temperature difference, so that the waste of energy sources can be avoided, the production cost is reduced, and the overall performance and reliability of the system are improved.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solution of the present utility model, and not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that the technical solutions described in the foregoing embodiments may be modified or some of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A BMS temperature difference feedback circuit, comprising:

the device comprises a thermoelectric generation module, an analog switch circuit and a switch control module;

the positive pole of the thermoelectric generation module is connected with the input end of the analog switch circuit, the negative pole of the thermoelectric generation module is grounded, and the output end of the analog switch circuit is connected with one end of the switch control module.

2. The BMS temperature difference feedback circuit according to claim 1, wherein said analog switching circuit comprises: resistor R1, resistor R3, resistor R5, and transistor Q1.

3. The BMS temperature difference feedback circuit according to claim 2, wherein,

one end of a resistor R3 is connected with the positive electrode of the temperature difference power generation module, the other end of the resistor R3 is connected with one end of a resistor R5, and the other end of the resistor R5 is grounded;

the other end of the resistor R3 is also connected with the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected with one end of the resistor R1, and the other end of the resistor R1 is connected with a 3.3V power supply;

and the collector electrode of the triode Q1 is also connected with one end of the switch control module, and the emitter electrode of the triode Q1 is grounded.

4. The BMS temperature difference feedback circuit according to claim 1, wherein the other one of said analog switch circuits comprises: resistor R2, resistor R4, zener diode D1 and transistor Q2.

5. The BMS temperature difference feedback circuit according to claim 4, wherein,

the negative electrode of the voltage stabilizing diode D1 is connected with the positive electrode of the thermoelectric generation module, the positive electrode of the voltage stabilizing diode D1 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the base electrode of a triode Q2, and the emitter electrode of the triode Q2 is grounded;

the collector of the triode Q2 is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a 3.3V power supply;

and the collector electrode of the triode Q2 is also connected with one end of the switch control module.

6. The BMS temperature difference feedback circuit according to claim 1, wherein the other one of said analog switch circuits comprises: resistor R6, resistor R7, resistor R8, and comparator U1.

7. The BMS temperature difference feedback circuit according to claim 6, wherein,

the positive input end pin 3 of the comparator U1 is connected with the positive electrode of the thermoelectric generation module, the negative input end pin 2 of the comparator U1 is connected with one end of the resistor R7, and the other end of the resistor R7 is grounded;

the negative input end pin 2 of the comparator U1 is also connected with one end of a resistor R8, and the other end of the resistor R8 is connected with a 3.3V power supply;

the power supply positive terminal pin 4 of the comparator U1 is grounded, the power supply negative terminal pin 8 of the comparator U1 is connected with the other end of the resistor R8, and the power supply negative terminal pin 8 of the comparator U1 is connected with a 3.3V power supply;

the output terminal pin 1 of the comparator U1 is connected with one end of a resistor R6, the other end of the resistor R6 is grounded, and the output terminal pin 1 of the comparator U1 is also connected with one end of the switch control module.

8. The BMS temperature difference feedback circuit according to claim 6, wherein,

the positive input pin 3 of the comparator U1 is connected with one end of a resistor R7, the other end of the resistor R7 is grounded, the positive input pin 3 of the comparator U1 is also connected with one end of a resistor R8, and the other end of the resistor R8 is connected with the positive electrode of the thermoelectric generation module;

the negative input end pin 2 of the comparator U1 is grounded, the positive power end pin 4 of the comparator U1 is grounded, and the negative power end pin 8 of the comparator U1 is connected with a 3.3V power supply;