Protective plate supporting photovoltaic charging

Abstract

The utility model discloses a protection board supporting photovoltaic charging, which comprises a solar photovoltaic module, an asynchronous boost charging control circuit and a lithium battery protection circuit, and the output end of the solar photovoltaic module is electrically connected with the asynchronous boost charging control circuit. The output end of the asynchronous boost charging control circuit is electrically connected with the lithium battery protection circuit, and the lithium battery protection circuit is used for being electrically connected with a battery cell group and load equipment. According to the protection plate supporting photovoltaic charging, the asynchronous boost charging control circuit is arranged, so that a small-sized solar photovoltaic panel can be used for charging a battery pack, clean energy conversion and utilization are realized, and the protection plate is more environment-friendly and energy-saving.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery protection devices, and in particular to a protection board that supports photovoltaic charging. Background Technology

[0002] Rechargeable lithium-ion battery packs are the core components for storing electrical energy and are widely used in consumer electronics, drones, electric vehicles, backup power supplies, and home energy storage products, especially with the rapid development of new energy sources in the last decade. We know that rechargeable lithium-ion batteries are highly reactive, and improper use can lead to bulging, leakage, overheating, fire, or even explosion. Therefore, a high-performance lithium battery protection board is one of the core components of a lithium-ion battery pack.

[0003] There are many types of protection boards on the market now. Some have only one protection function, some have general detection accuracy, some have pure hardware protection functions, and some are combination protection boards with microcontroller and AFE front-end detection. Most of them focus on lithium battery protection.

[0004] However, existing lithium battery protection boards generally only have protection functions. Some have added charging management, but these are simple step-down charging management circuits that cannot accept a wider range of charging voltages, nor can they achieve photovoltaic charging or use clean energy sources such as solar energy. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a protection board that supports photovoltaic charging.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A protection board supporting photovoltaic charging includes: a solar photovoltaic module, an asynchronous boost charging control circuit, and a lithium battery protection circuit. The output terminal of the solar photovoltaic module is electrically connected to the asynchronous boost charging control circuit, and the output terminal of the asynchronous boost charging control circuit is electrically connected to the lithium battery protection circuit. The lithium battery protection circuit is used to electrically connect to the battery cell assembly and the load device, respectively.

[0008] In one embodiment, the asynchronous boost charging control circuit includes a boost control chip, an inductor L1, a Zener diode D4, a capacitor C15, and a capacitor C16. The first end of the inductor L1 is electrically connected to the solar photovoltaic module, and the second end of the inductor L1 is electrically connected to the SW pin of the boost control chip and the anode of the Zener diode D4. The cathode of the Zener diode D4 is filtered by capacitors C15 and C16 and then electrically connected to the VBS pin of the boost control chip.

[0009] In one of the embodiments, the asynchronous boost charging control circuit further comprises a resistor R18 and a capacitor C14, a first end of the resistor R18 is electrically connected with the solar photovoltaic module, and a second end of the resistor R18 is electrically connected with the capacitor C14 and a VIN pin of the boost control chip respectively.

[0010] In one of the embodiments, the protection board further comprises a surge protection circuit module, an input end of the surge protection circuit module is electrically connected with the asynchronous boost charging control circuit, and an output end of the surge protection circuit module is electrically connected with the lithium battery protection circuit.

[0011] The surge protection circuit module comprises a MOS tube Q3 and a triode Q4, a D pole of the MOS tube Q3 is electrically connected with the asynchronous boost charging control circuit, an S pole of the MOS tube Q3 is electrically connected with the lithium battery protection circuit, a G pole of the MOS tube Q3 is electrically connected with a collector of the triode Q4, a base of the triode Q4 is further electrically connected with the solar photovoltaic module, and an emitter of the triode Q4 is grounded.

[0012] In one of the embodiments, the lithium battery protection circuit comprises a protection control chip U1, a charge-discharge MOSFET module, a current detection circuit module, a temperature detection module and a communication module, the protection control chip U1 is electrically connected with the surge protection circuit module, the charge-discharge MOSFET module, the current detection circuit module, the temperature detection module and the communication module respectively, an input end of the charge-discharge MOSFET module is electrically connected with an output end of the surge protection circuit module, and an output end of the charge-discharge MOSFET module is used for being electrically connected with a battery cell group.

[0013] In one of the embodiments, the charge-discharge MOSFET module comprises a discharge MOS tube QD1 and a charge MOS tube QC1, an input end of the discharge MOS tube QD1 is electrically connected with an output end of the surge protection circuit module, the output end of the discharge MOS tube QD1 is connected in series with the charge MOS tube QC1, and then is used for being electrically connected with the battery cell group.

[0014] Control ends of the discharge MOS tube QD1 and the charge MOS tube QC1 are electrically connected with the protection control chip U1.

[0015] In one of the embodiments, the current detection circuit module comprises a detection resistor RS1, a resistor R12 and a resistor R13, the detection resistor RS1 is connected in series at a total negative end of the battery cell group, two ends of the detection resistor RS1 are electrically connected with one end of the resistor R12 and the resistor R13 respectively, and the other ends of the resistor R12 and the resistor R13 are electrically connected with the protection control chip U1.

[0016] In one of the embodiments, the temperature detection module is an NTC temperature sensor, which is arranged close to the battery cell group and electrically connected with the protection control chip U1.

[0017] In one of the embodiments, the communication module comprises a resistor R15, a resistor R17, a voltage stabilizing diode D2 and a voltage stabilizing diode D3. One end of the resistor R15 is electrically connected with the protection control chip U1 after voltage stabilization by the voltage stabilizing diode D3. The other end of the resistor R15 is electrically connected with an external active MCU. One end of the resistor R17 is electrically connected with the protection control chip U1 after voltage stabilization by the voltage stabilizing diode D2. The other end of the resistor R17 is electrically connected with an external master MCU.

[0018] In one of the embodiments, the lithium battery protection circuit further comprises a battery cell secondary protection circuit module, which is connected in series between the charge-discharge MOSFET module and the battery cell group.

[0019] The battery cell secondary protection circuit module comprises an integrated circuit U2, a MOS tube Q2 and a fuse F1. The control end of the MOS tube Q2 is electrically connected with the integrated circuit U2. The D pole of the MOS tube Q2 is electrically connected with the control end of the fuse F1. The integrated circuit U2 is further electrically connected with the battery cell group. The fuse F1 is connected in series between the charge-discharge MOSFET module and the battery cell group.

[0020] The advantages and beneficial effects of the present application compared with the prior art are as follows:

[0021] The present application is a protection plate supporting photovoltaic charging. By setting an asynchronous boost charging control circuit, a small solar photovoltaic panel can be used to charge a battery pack, realizing clean energy conversion and utilization, and being more environmentally friendly and energy-saving. The present application further has a secondary overcharge protection function, i.e. by setting a battery cell secondary protection circuit module, it is suitable for monitoring and protecting multiple series and parallel high-precision battery groups of rechargeable lithium ion, lithium polymer and lithium iron phosphate battery cells, and improves safety performance. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Fig. 1 is a principle block diagram of the protection plate supporting photovoltaic charging according to an embodiment of the present application;

[0023] Figure 2 Fig. 2 is a circuit diagram of the protection plate supporting photovoltaic charging shown in Fig. 1; Figure 1

[0024] Fig. 3 is a principle block diagram of the protection plate supporting photovoltaic charging according to another embodiment of the present application; and Figure 3 Figure 1 Fig. 4 is a circuit diagram of the protection plate supporting photovoltaic charging shown in Fig. 3.​ DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0026] The addition of the boost type charging management circuit can receive a wider charging voltage range, so as to make the photovoltaic charging more easily realized. At the present stage of rapid development of new energy technology, the more extensive development and utilization of solar energy and other clean energy can effectively alleviate the huge pressure of energy crisis.

[0027] Please refer to Figure 1 and Figure 3 A protection board supporting photovoltaic charging, comprising: a solar photovoltaic module 100, an asynchronous boost charging control circuit 110 and a lithium battery protection circuit, the output end of the solar photovoltaic module is electrically connected with the asynchronous boost charging control circuit, the output end of the asynchronous boost charging control circuit is electrically connected with the lithium battery protection circuit, and the lithium battery protection circuit is used for being electrically connected with the cell group and the load device respectively. Figure 3 In the Figure 3 , the lithium battery protection circuit is also connected with the load device, and is used for providing a power supply for the load device.

[0028] It should be noted that the solar photovoltaic module is used for converting solar energy into electric energy; the asynchronous boost charging control circuit is used for raising and stabilizing the fluctuating voltage generated by the photovoltaic module with light intensity change to a set fixed voltage value during the charging process, and charging the cell group; and the lithium battery protection circuit is used for protecting the normal work of the cell group. In this way, by setting the asynchronous boost charging control circuit, the small solar photovoltaic panel can be used for charging the battery pack, realizing clean energy conversion and utilization, and being more environmentally friendly and energy-saving.

[0029] Please refer to Figure 2The asynchronous boost charging control circuit 110 comprises a boost control chip, an inductor L1, a voltage stabilizing diode D4, a capacitor C15 and a capacitor C16. The first end of the inductor L1 is electrically connected with the solar photovoltaic module. The second end of the inductor L1 is electrically connected with the SW pin of the boost control chip and the anode of the voltage stabilizing diode D4 respectively. The cathode of the voltage stabilizing diode D4 is electrically connected with the VBS pin of the boost control chip after being filtered by the capacitor C15 and the capacitor C16. Further, the asynchronous boost charging control circuit further comprises a resistor R18 and a capacitor C14. The first end of the resistor R18 is electrically connected with the solar photovoltaic module. The second end of the resistor R18 is electrically connected with the capacitor C14 and the VIN pin of the boost control chip respectively. It should be noted that the inductor L1 is used to realize the function of rectification, and the voltage stabilizing diode D4 is used to stabilize the voltage input to the boost control chip U3. In this way, the asynchronous boost charging control circuit adopts the trickle, constant current and constant voltage charging mode to complete a charging cycle in one complete period. The circuit has perfect lithium battery charging protection function. When the input overvoltage, output overvoltage and over-temperature state occur, the boost charging state will be immediately closed. When the cell voltage is lower than the set value, the output undervoltage protection function is turned on. The charging current can be adjusted according to the actual demand of the resistor configuration.

[0030] In another embodiment, the protection board further comprises a surge protection circuit module 120. The input end of the surge protection circuit module is electrically connected with the asynchronous boost charging control circuit. The output end of the surge protection circuit module is electrically connected with the lithium battery protection circuit. In this way, by setting the surge protection circuit module, when the motor or heavy load is suddenly disconnected, a relatively high surge voltage can be prevented from exceeding the withstand voltage of the integrated circuit and burning out the integrated circuit, thereby playing a protection role.

[0031] The surge protection circuit module comprises a MOS tube Q3 and a triode Q4. The D pole of the MOS tube Q3 is electrically connected with the asynchronous boost charging control circuit. The S pole of the MOS tube Q3 is electrically connected with the lithium battery protection circuit. The G pole of the MOS tube Q3 is electrically connected with the collector of the triode Q4. The base of the triode Q4 is also electrically connected with the solar photovoltaic module. The emitter of the triode Q4 is grounded.

[0032] It should be noted that the lithium battery protection circuit includes a protection control chip U1, a charge-discharge MOSFET module 200, a current detection circuit module 210, a temperature detection module 220, and a communication module 230. The protection control chip U1 is electrically connected to the anti-surge protection circuit module, the charge-discharge MOSFET module, the current detection circuit module, the temperature detection module, and the communication module, respectively. The input end of the charge-discharge MOSFET module is electrically connected to the output end of the anti-surge protection circuit module. The output end of the charge-discharge MOSFET module is used for electrical connection with the battery cell group.

[0033] Further, the charge-discharge MOSFET module includes a discharge MOS tube QD1 and a charge MOS tube QC1. The input end of the discharge MOS tube QD1 is electrically connected to the output end of the anti-surge protection circuit module. The output end of the discharge MOS tube QD1 is connected in series with the charge MOS tube QC1, and then used for electrical connection with the battery cell group.

[0034] The control ends of the discharge MOS tube QD1 and the charge MOS tube QC1 are electrically connected to the protection control chip U1. In this way, by setting the discharge MOS tube QD1 and the charge MOS tube QC1, the battery cell information can be collected by the first protection integrated circuit U1, and the conduction or cutoff of the MOSFET can be controlled through logical operation to achieve protection of the battery cell.

[0035] Further, the current detection circuit module includes a detection resistor RS1, a resistor R12, and a resistor R13. The detection resistor RS1 is connected in series at the total negative end of the battery cell group. The two ends of the detection resistor RS1 are electrically connected to one end of the resistor R12 and the resistor R13, respectively. The other ends of the resistor R12 and the resistor R13 are electrically connected to the protection control chip U1. In this way, by setting the detection resistor RS1, the resistor R12, and the resistor R13, the voltage drop across the current detection resistor RS1 can be collected by the integrated circuit U1, and the working current value on the main circuit can be obtained through logical operation.

[0036] Please refer to Figure 2 The temperature detection module is an NTC temperature sensor. The NTC temperature sensor is arranged close to the battery cell group, and the NTC temperature sensor is electrically connected to the protection control chip U1. In this way, by setting the NTC temperature sensor, the voltage drop across the negative temperature coefficient thermistor NTC1 can be collected by the integrated circuit U1, and the temperature value on the battery cell can be obtained through logical operation.

[0037] Please refer to Figure 2The communication module comprises a resistor R15, a resistor R17, a voltage stabilizing diode D2 and a voltage stabilizing diode D3, one end of the resistor R15 is electrically connected with the protection control chip U1 after voltage stabilization of the voltage stabilizing diode D3, the other end of the resistor R15 is electrically connected with an external active MCU, one end of the resistor R17 is electrically connected with the protection control chip U1 after voltage stabilization of the voltage stabilizing diode D2, and the other end of the resistor R17 is electrically connected with the external master MCU. In this way, the integrated circuit U1 supports reporting battery voltage, current, temperature and other information to the master MCU through the IIC communication mode, and also supports the master MCU controlling the conduction or cut-off of the main loop MOSFET through the IIC communication command mode, thereby providing a friendly interface for the development of intelligent devices.

[0038] It should be further explained that the lithium battery protection circuit further comprises a battery cell secondary protection circuit module 300 connected in series between the charge-discharge MOSFET module and the battery cell group.

[0039] The battery cell secondary protection circuit module comprises an integrated circuit U2, a MOS tube Q2 and a fuse F1, the control end of the MOS tube Q2 is electrically connected with the integrated circuit U2, the D pole of the MOS tube Q2 is electrically connected with the control end of the fuse F1, the integrated circuit U2 is further electrically connected with the battery cell group, and the fuse F1 is connected in series between the charge-discharge MOSFET module and the battery cell group. In this way, when the battery cell is secondarily overcharged and lasts for more than a few seconds, the secondary protection integrated circuit U2 will send a control signal to turn on the MOSFET of Q2, and the three-terminal fuse F1 will be permanently fused, thereby disconnecting the main loop and playing a protection role. The utility model also has a secondary overcharge protection function, that is, by arranging the battery cell secondary protection circuit module, it is applicable to the monitoring and protection of multi-string and high-precision battery groups of rechargeable lithium ion, lithium polymer and lithium iron phosphate battery cells, and the safety performance is improved. The protection board also selects a high-precision protection IC to provide conventional overcharge, overdischarge, charge-discharge overcurrent, charge-discharge overtemperature protection and equalization functions.

[0040] Meanwhile, the protection board technology increases an asynchronous boost charging controller circuit, a small solar photovoltaic panel can be used to charge the battery pack, clean energy conversion and utilization are realized, and the protection board is more environmentally friendly and energy-saving.

[0041] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A protective panel supporting photovoltaic charging, characterized in that, The application relates to a solar photovoltaic module, an asynchronous boost charging control circuit and a lithium battery protection circuit, wherein the output end of the solar photovoltaic module is electrically connected with the asynchronous boost charging control circuit, the output end of the asynchronous boost charging control circuit is electrically connected with the lithium battery protection circuit, and the lithium battery protection circuit is electrically connected with a battery cell group and a load device respectively. The asynchronous boost charging control circuit comprises a boost control chip, an inductor L1, a voltage stabilizing diode D4, a capacitor C15 and a capacitor C16; the first end of the inductor L1 is electrically connected with the solar photovoltaic module; the second end of the inductor L1 is electrically connected with the SW pin of the boost control chip and the anode of the voltage stabilizing diode D4 respectively; the cathode of the voltage stabilizing diode D4 is electrically connected with the VBS pin of the boost control chip after being filtered by the capacitor C15 and the capacitor C16. The protection board further comprises a surge protection circuit module, the input end of the surge protection circuit module is electrically connected with the asynchronous boost charging control circuit, and the output end of the surge protection circuit module is electrically connected with the lithium battery protection circuit. The lithium battery protection circuit comprises a protection control chip U1, a charge-discharge MOSFET module, a current detection circuit module, a temperature detection module and a communication module; the protection control chip U1 is electrically connected with the surge protection circuit module, the charge-discharge MOSFET module, the current detection circuit module, the temperature detection module and the communication module respectively; the input end of the charge-discharge MOSFET module is electrically connected with the output end of the surge protection circuit module; and the output end of the charge-discharge MOSFET module is electrically connected with the battery cell group. The asynchronous boost charging control circuit further comprises a resistor R18 and a capacitor C14; the first end of the resistor R18 is electrically connected with the solar photovoltaic module; and the second end of the resistor R18 is electrically connected with the capacitor C14 and the VIN pin of the boost control chip respectively.

2. The protective panel supporting photovoltaic charging according to claim 1, characterized in that, The surge protection circuit module comprises a MOS tube Q3 and a triode Q4; the D pole of the MOS tube Q3 is electrically connected with the asynchronous boost charging control circuit; the S pole of the MOS tube Q3 is electrically connected with the lithium battery protection circuit; the G pole of the MOS tube Q3 is electrically connected with the collector of the triode Q4; the base of the triode Q4 is further electrically connected with the solar photovoltaic module; and the emitter of the triode Q4 is grounded.

3. The protective panel supporting photovoltaic charging according to claim 1, characterized in that, The charge-discharge MOSFET module comprises a discharge MOS tube QD1 and a charge MOS tube QC1; the input end of the discharge MOS tube QD1 is electrically connected with the output end of the surge protection circuit module; the output end of the discharge MOS tube QD1 is connected with the charge MOS tube QC1 in series and then is electrically connected with the battery cell group, 4. The solar-charge-enabled protective panel of claim 1, wherein, The control ends of the discharge MOS tube QD1 and the charge MOS tube QC1 are electrically connected with the protection control chip U1. ​ 5. The solar-charge-enabled protective panel of claim 1, wherein, The current detection circuit module comprises a detection resistor RS1, a resistor R12 and a resistor R13, the detection resistor RS1 is connected in series at the total negative end of the battery cell group, two ends of the detection resistor RS1 are respectively electrically connected with one end of the resistor R12 and one end of the resistor R13, and the other end of the resistor R12 and the other end of the resistor R13 are electrically connected with the protection control chip U1.

6. The protective panel supporting photovoltaic charging of claim 1, wherein, The temperature detection module is an NTC temperature sensor, the NTC temperature sensor is arranged close to the battery cell group, and the NTC temperature sensor is electrically connected with the protection control chip U1.

7. The protective panel supporting photovoltaic charging of claim 1, wherein, The communication module comprises a resistor R15, a resistor R17, a voltage stabilizing diode D2 and a voltage stabilizing diode D3, one end of the resistor R15 is electrically connected with the protection control chip U1 after voltage stabilization of the voltage stabilizing diode D3, the other end of the resistor R15 is used for electrical connection with an external main MCU, one end of the resistor R17 is electrically connected with the protection control chip U1 after voltage stabilization of the voltage stabilizing diode D2, and the other end of the resistor R17 is used for electrical connection with an external main control MCU.

8. The solar-charge-enabled protective panel of claim 1, wherein, The lithium battery protection circuit further comprises a battery cell secondary protection circuit module, the battery cell secondary protection circuit module is connected in series between the charge-discharge MOSFET module and the battery cell group. The battery cell secondary protection circuit module comprises an integrated circuit U2, a MOS tube Q2 and a fuse F1, a control end of the MOS tube Q2 is electrically connected with the integrated circuit U2, a D pole of the MOS tube Q2 is electrically connected with a control end of the fuse F1, the integrated circuit U2 is further electrically connected with the battery cell group, and the fuse F1 is connected in series between the charge-discharge MOSFET module and the battery cell group.

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