Mining intrinsic safety type lithium battery BMS management device
By introducing output overvoltage and overcurrent protection modules into the protection circuit of lithium mining batteries, using optocouplers and PMOS pipe modules and timing and operational amplification modules, the rapid detection and timely protection of current and voltage are achieved, solving the problems of insensitive protection and large losses in the prior art, and improving safety.
Patent Information
- Application Number
- CN202421967545.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-08-14
AI Technical Summary
The existing lithium-ion battery protection circuit for mining is not sensitive enough, its own losses are large, and the overvoltage protection is not shut down in time, resulting in a high risk of safety accidents.
The output overvoltage protection module and the output overcurrent protection module are adopted, and the optical coupling submodule, PMOS pipe module, timing submodule and operational amplification module are respectively used to realize the rapid detection and timely protection of current and voltage, and the battery management is carried out in combination with the charge and discharge module.
It realizes timely shutdown of overcurrent and overvoltage, reduces circuit losses, improves safety, and meets the design requirements of intrinsically safe lithium batteries for mining.
Smart Images
Figure CN223168054U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of intrinsically safe lithium battery management for coal mines, and particularly relates to an intrinsically safe lithium battery BMS management device for mines. Background Art
[0002] In the application of mine lithium batteries, high requirements are placed on their own safety performance, especially in terms of self - protection. However, the existing protection circuits mainly perform physical voltage limiting on the charging and discharging of the entire battery and limit the current by connecting resistors in series. This method of protection circuit is not very able to meet the requirements of intrinsically safe design for mines. The existing protection methods may lead to safety accidents caused by overcharging or over - discharging of lithium batteries due to insufficient sensitivity of over - current protection, large self - loss, and untimely turn - off of over - voltage protection. Summary of the Invention
[0003] In order to at least partially solve the problems of insufficient sensitivity of over - current protection, large self - loss, and untimely turn - off of over - voltage protection, the utility model provides an intrinsically safe lithium battery BMS management device for mines. By setting an output over - voltage protection module, timely turn - off of the circuit during over - voltage is achieved, and by setting an output over - current protection module, the requirements of over - current protection are met and the self - loss of the circuit is reduced.
[0004] To achieve the above object, the technical solution of the utility model is as follows:
[0005] An intrinsically safe lithium battery BMS management device for mines includes: a charge - discharge module, a battery, an output over - voltage protection module, and an output over - current protection module. The output ends of the output over - voltage protection module and the output over - current protection module are electrically connected to the input end of the charge - discharge module;
[0006] The output over - voltage protection module includes an optocoupler sub - module and a PMOS tube sub - module. The output end of the PMOS tube sub - module is electrically connected to the input end of the optocoupler sub - module. When the output voltage is too high, the optocoupler sub - module works to turn off the PMOS tube sub - module for controlling the voltage;
[0007] The output over - current protection module includes a timing sub - module and an operational amplifier module. The output ends of the timing sub - module and the operational amplifier module are electrically connected to the input end of the charge - discharge module, facilitating quick identification and analysis judgment of the output current.
[0008] Further, the charge - discharge module includes a power management sub - module. The power management sub - module includes an FM8254AAV chip. The power management sub - module is serially connected to multiple batteries through VC1, VC2, VC3, and VC4 serial ports for charging the batteries. The power management sub - module is serially connected to the output over - current protection module through VC and CTL serial ports to prevent the output current from being too large.
[0009] Further, the timing sub-module and the power management sub-module are connected through the VC and CTL serial ports, and the operational amplifier module and the power management sub-module are connected through the VC serial port, enabling it to sensitively detect the magnitude of the current.
[0010] Further, the timing sub-module includes an SE555DR timer, and the operational amplifier module includes an LM358 operational amplifier.
[0011] Further, the optocoupler sub-module includes an EL357N optocoupler, and the PMOS transistor sub-module includes a PMOS transistor of model VBA2625.
[0012] Advantages of the present utility model:
[0013] (1) The present utility model is provided with an output overcurrent protection module. By using the timing sub-module and the operational amplifier module for overcurrent detection and high-speed logic devices, the detection is sensitive, and it can quickly identify, analyze, and judge the output current.
[0014] (2) The present utility model is provided with an output overvoltage protection module. By controlling the operation of the PMOS transistor sub-module through the optocoupler sub-module, the overvoltage turn-off protection is timely.
[0015] (3) The present utility model is provided with a charge and discharge module that can charge and discharge 4 batteries simultaneously. Each battery monitors its charge and discharge current and voltage separately, reducing the self-loss of the circuit. Description of the Drawings
[0016] Figure 1 It is one of the electrical schematic diagrams of a mine intrinsically safe lithium battery BMS management device provided by an embodiment of the present utility model.
[0017] Figure 2 It is the second electrical schematic diagram of a mine intrinsically safe lithium battery BMS management device provided by an embodiment of the present utility model.
[0018] Figure 3 It is the third electrical schematic diagram of a mine intrinsically safe lithium battery BMS management device provided by an embodiment of the present utility model.
[0019] Figure 4 It is the fourth electrical schematic diagram of a mine intrinsically safe lithium battery BMS management device provided by an embodiment of the present utility model.
[0020] Reference numerals in the drawings: 1 is the charge and discharge module, 2 is the output overvoltage protection module, 3 is the output overcurrent protection module, 4 is the optocoupler sub-module, 5 is the PMOS transistor sub-module, 6 is the timing sub-module, 7 is the operational amplifier module, 8 is the power management sub-module, and 9 is the battery. Specific Embodiments
[0021] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.
[0022] Embodiment 1
[0023] As Figures 1 to 4 shown, a mine intrinsically safe lithium battery BMS management device includes: a charge and discharge module 1, a battery 9, an output overvoltage protection module 2 and an output overcurrent protection module 3. The output ends of the output overvoltage protection module 2 and the output overcurrent protection module 3 are electrically connected to the input end of the charge and discharge module 1 to prevent overvoltage or overcurrent in the circuit.
[0024] The output overvoltage protection module 2 includes an optocoupler sub-module 4 and a PMOS transistor sub-module 5. The output end of the PMOS transistor sub-module 5 is electrically connected to the input end of the optocoupler sub-module 4. Specifically, the optocoupler sub-module 4 includes an EL357N optocoupler, and the PMOS transistor sub-module 5 includes a PMOS transistor of model VBA2625. During use, it is necessary to consider the harm caused to other devices due to overvoltage during discharge, especially the potential safety hazards caused by overvoltage. The present utility model adopts a combined circuit of the optocoupler sub-module 4 and the PMOS transistor sub-module 5, and utilizes the 2.5V voltage stabilization characteristic of the Tl431 voltage stabilizing power supply. When the output voltage exceeds the preset 16.8V, the EL357N optocoupler is driven to conduct, and the PMOS transistor of model VBA2625 is turned off. When it is lower than 16.8V, the system automatically turns on, meeting the design requirements of mine intrinsic safety.
[0025] The power management sub-module 8 is connected to the output overcurrent protection module 3 through the VC and CTL serial ports. The output overcurrent protection module 3 includes a timing sub-module 6 and an operational amplifier module 7. Specifically, the timing sub-module 6 includes a SE555DR timer, and the operational amplifier module 7 includes an LM358 operational amplifier.
[0026] The current output from the OUT serial port of the timing sub-module 6 is connected to the two input ends of the operational amplifier module 7 through a triode, and the output end of the operational amplifier module 7 is connected to the charge and discharge module 1. The output overcurrent protection module 3 adopts two-stage overcurrent detection, and the protection circuit is all built with logic devices, with sensitive detection and capable of quickly identifying and analyzing the output current.
[0027] The charge and discharge module 1 includes a power management sub-module 8, and the power management sub-module 8 includes an FM8254AAV chip. The power management sub-module 8 is serially connected to four batteries 9 through VC1, VC2, VC3, and VC4 serial ports respectively, facilitating the charging and discharging of the batteries 9. The timing sub-module 6 is serially connected to the power management sub-module 8 through the VC and CTL serial ports, and the operational amplifier module 7 is serially connected to the power management sub-module 8 through the VC serial port. The present utility model adopts a dedicated charge and discharge integrated circuit of FM8544. The battery 9 is a lithium iron phosphate battery. Through the charge and discharge module 1, 4 batteries 9 can be charged and discharged simultaneously. The charging and discharging current and voltage of each battery 9 are monitored separately. For a single battery 9, when the overcharge maximum voltage is higher than 4.35V, it is turned off; when it is lower than 4.15V, it is turned on; when the minimum voltage is lower than 2.7V, the output is turned off; when it is greater than 3.0V, the output is turned on. It can fully achieve the balanced discharge and charge of the current of each battery 9. Specifically, the power management sub-module 8 controls the current output of the power supply. The current is respectively connected to the battery 9 through the VC1, VC2, VC3, and VC4 serial ports for charging the battery 9.
[0028] Preferably, the present utility model also sets a charging overvoltage and overcurrent protection module. Considering the application scenario problems during the charging process, to avoid safety hazards such as equipment damage or fire caused by overcharging, in the circuit design of the input voltage, the protection point of the overvoltage protection circuit involves 17V. When it exceeds 17V, the thyristor is turned off to automatically close the charging circuit by the system.
[0029] Embodiment 2
[0030] During actual application, the charge and discharge module 1 manages the battery 9, achieving the balanced discharge and charge of the current of each battery 9 and reducing the loss brought by the circuit itself. The charging overvoltage and overcurrent protection module adopts a three-stage overvoltage protection circuit to control and protect the voltage. When the voltage is greater than 17V, the thyristor is turned off to automatically close the charging circuit by the system.
[0031] When the circuit outputs, an output overvoltage protection module 2 and an output overcurrent protection module 3 are set to detect the current and voltage of the circuit, ensuring that it will not be damaged due to overcurrent or overvoltage.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.
Claims
1. A intrinsically safe lithium battery BMS management device for mine use, characterized in that, Including: A charge and discharge module (1), a battery (9), an output overvoltage protection module (2), and an output overcurrent protection module (3). The output ends of the output overvoltage protection module (2) and the output overcurrent protection module (3) are electrically connected to the input end of the charge and discharge module (1). The output overvoltage protection module (2) includes an optocoupler sub-module (4) and a PMOS transistor sub-module (5). The output end of the PMOS transistor sub-module (5) is electrically connected to the input end of the optocoupler sub-module (4). The output overcurrent protection module (3) includes a timing sub-module (6) and an operational amplifier module (7). The output ends of the timing sub-module (6) and the operational amplifier module (7) are electrically connected to the input end of the charge and discharge module (1).
2. The intrinsically safe lithium battery BMS management device for mine use according to claim 1, characterized in that, The charge and discharge module (1) includes a power management sub-module (8). The power management sub-module (8) includes an FM8254AAV chip. The power management sub-module (8) is serially connected to multiple batteries (9) through VC1, VC2, VC3, and VC4 serial ports respectively. The power management sub-module (8) is serially connected to the output overcurrent protection module (3) through VC and CTL serial ports.
3. The intrinsically safe lithium battery BMS management device for mine use according to claim 2, wherein The timing sub-module (6) is serially connected to the power management sub-module (8) through VC and CTL serial ports. The operational amplifier module (7) is serially connected to the power management sub-module (8) through the VC serial port.
4. The intrinsically safe lithium battery BMS management device for mine use according to claim 1, characterized in that, The timing sub-module (6) includes a SE555DR timer. The operational amplifier module (7) includes an LM358 operational amplifier.
5. The intrinsically safe lithium battery BMS management device for mine use according to claim 1, characterized in that, The optocoupler sub-module (4) includes an EL357N optocoupler. The PMOS transistor sub-module (5) includes a VBA2625 type PMOS transistor.