Battery protection circuit, energy storage power supply and motor home

Abstract

The utility model discloses a battery protection circuit, an energy storage power supply and a motor home. The battery protection circuit is used for an energy storage power supply, the energy storage power supply comprises a battery and a control module, and the battery protection circuit comprises a voltage detection module, a voltage comparison module and a switch module. A first input end of the voltage detection module is electrically connected with a battery anode, and a second input end of the voltage detection module is electrically connected with a battery cathode; the voltage comparison module is used for outputting a first switch control signal when the battery voltage is lower than a set voltage; the input end of the switch module is electrically connected with the output end of the voltage comparison module, the output end of the switch module is electrically connected with the on-off control end of the control module, and the switch module is used for outputting a shutdown control signal to the on-off control end of the control module based on the first switch control signal, so that the control module controls the energy storage power supply to be shut down. By adopting the scheme, the problem that the performance and the service life of the battery are influenced by long-term continuous discharge of the battery is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery protection, in particular to a battery protection circuit, an energy storage power supply and a recreational vehicle. Background Art

[0002] With the development of society, RVs are becoming more and more popular and sought after. Existing RVs have added some electrical equipment on the basis of traditional cars, so RVs are usually equipped with energy storage power supplies for energy supply.

[0003] Existing energy storage power supplies typically consist of batteries and a control module. The control module controls the power supply's on and off. When the power supply is off, the battery stops outputting power. When an RV is not in use, certain electronic devices, such as alarm clocks and dashcams, may remain running, causing the battery to continuously discharge. Prolonged battery discharge can lead to power loss, impacting battery performance and lifespan. Utility Model Content

[0004] The utility model provides a battery protection circuit, an energy storage power supply and a recreational vehicle, so as to solve the problem that long-term continuous discharge of a battery affects the performance and life of the battery.

[0005] According to one aspect of the present invention, a battery protection circuit is provided for an energy storage power supply, wherein the energy storage power supply includes a battery and a control module, wherein the battery includes a positive electrode and a negative electrode, and the control module is used to control the power on and off of the energy storage power supply. The battery protection circuit includes a voltage detection module, a voltage comparison module, and a switch module;

[0006] The first input end of the voltage detection module is electrically connected to the positive electrode of the battery, and the second input end of the voltage detection module is electrically connected to the negative electrode of the battery;

[0007] The output end of the voltage detection module is electrically connected to the input end of the voltage comparison module, and the voltage comparison module is used to output a first switch control signal when the battery voltage is lower than a set voltage;

[0008] The input end of the switch module is electrically connected to the output end of the voltage comparison module, and the output end of the switch module is electrically connected to the power on / off control end of the control module. The switch module is used to output a shutdown control signal to the power on / off control end of the control module based on the first switch control signal, so that the control module controls the energy storage power supply to shut down.

[0009] In an optional embodiment of the present utility model, the voltage comparison circuit includes a Zener diode, the cathode of the Zener diode is electrically connected to the output end of the voltage detection module, the anode of the Zener diode is electrically connected to the input end of the switch module, and the Zener diode is used to cut off when the battery voltage is lower than the set voltage.

[0010] In an optional embodiment of the present utility model, the voltage detection module includes a first voltage-dividing resistor and a second voltage-dividing resistor, one end of the first voltage-dividing resistor is electrically connected to the positive electrode of the battery, the other end of the first voltage-dividing resistor is electrically connected to one end of the second voltage-dividing resistor, and the other end of the second voltage-dividing resistor is electrically connected to the negative electrode of the battery;

[0011] The cathode of the voltage-stabilizing diode is electrically connected between the first voltage-dividing resistor and the second voltage-dividing resistor.

[0012] In an optional embodiment of the present utility model, the switch module includes a first switch submodule and a second switch submodule;

[0013] The input end of the first switch submodule is electrically connected to the output end of the voltage comparison module, the output end of the first switch submodule is electrically connected to the input end of the second switch submodule, and the first switch submodule is configured to be turned off based on the first switch control signal to output the second switch control signal;

[0014] The output end of the second switch submodule is electrically connected to the power on / off control end of the control module. The second switch submodule is configured to be turned on based on the second switch control signal to output the shutdown control signal.

[0015] In an optional embodiment of the present utility model, the first switch sub-module includes a first MOS transistor, which is an NMOS transistor. The gate of the first MOS transistor is electrically connected to the output end of the voltage comparison module, the source of the first MOS transistor is electrically connected to the ground, and the drain of the first MOS transistor is electrically connected to the input end of the second switch sub-module.

[0016] In an optional embodiment of the present invention, the shutdown control signal is a low-level signal, the second switch submodule includes a first transistor and a voltage providing unit, the first transistor is an NPN transistor, and the voltage providing unit is used to provide a conduction voltage for the first transistor;

[0017] The base of the first transistor is electrically connected to the drain of the first MOS transistor, the emitter of the first transistor is electrically connected to the ground, and the collector of the first transistor is electrically connected to the power on / off control terminal of the control module.

[0018] In an optional embodiment of the present utility model, the voltage providing unit includes a third voltage-dividing resistor and a fourth voltage-dividing resistor, one end of the third voltage-dividing resistor is electrically connected to the positive electrode of the battery, the other end of the third voltage-dividing resistor is electrically connected to one end of the fourth voltage-dividing resistor, and the other end of the fourth voltage-dividing resistor is electrically connected to the negative electrode of the battery;

[0019] The base of the first transistor is electrically connected between the third voltage-dividing resistor and the fourth voltage-dividing resistor.

[0020] In an optional embodiment of the present invention, the first switch submodule further includes a current-limiting resistor, which is connected in series between the gate of the first MOS transistor and the ground.

[0021] According to another aspect of the present invention, an energy storage power supply is provided, comprising a battery and a control module, wherein the battery comprises a positive electrode and a negative electrode, and the control module is used to control the power on and off of the energy storage power supply. The energy storage power supply also comprises the battery protection circuit described in any embodiment of the present invention.

[0022] According to another aspect of the present invention, a recreational vehicle is provided, which includes the energy storage power supply described in any embodiment of the present invention.

[0023] The technical solution of the present embodiment of the utility model detects the battery voltage through a voltage detection module, then compares the battery voltage with a set voltage through a voltage comparison module. When the battery voltage falls below the set voltage, a first switch control signal is output. Then, based on the first switch control signal, the switch module outputs a shutdown control signal to the power on / off control terminal of the control module, causing the control module to control the energy storage power supply to shut down. Therefore, it is possible to control the energy storage power supply to shut down when the battery voltage falls below the set voltage, achieving automatic shutdown of the energy storage power supply, preventing the problem of battery depletion caused by prolonged discharge, and ensuring battery performance. This solves the problem of long-term continuous discharge affecting battery performance and lifespan.

[0024] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a circuit schematic diagram of an energy storage power supply used in a battery protection circuit provided according to the first embodiment of the present invention.

[0027] Among them: 1. Battery; 2. Control module; 3. Voltage detection module; 31. First voltage-dividing resistor; 32. Second voltage-dividing resistor; 4. Voltage comparison module; 41. Voltage-stabilizing diode; 5. Switch module; 51. First switch sub-module; 511. First MOS tube; 512. Current-limiting resistor; 52. Second switch sub-module; 521. First transistor; 522. Voltage providing unit; 5221. Third voltage-dividing resistor; 5222. Fourth voltage-dividing resistor. DETAILED DESCRIPTION

[0028] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] Example 1

[0031] The first embodiment of the present invention provides a battery protection circuit, such as Figure 1 As shown, this embodiment can be applied to protecting battery 1 of an energy storage power supply. The energy storage power supply includes battery 1 and control module 2. Battery 1 includes a positive electrode and a negative electrode. Control module 2 is used to control the power on and off of the energy storage power supply. Specifically, control module 2 includes a power on / off control terminal. When the power on / off control terminal of control module 2 is at a low level, control module 2 controls the power storage power supply to shut down. Preferably, control module 2 includes a switching power supply chip, and the power on / off control terminal is the COMP pin of the switching power supply chip.

[0032] The battery protection circuit includes a voltage detection module 3, a voltage comparison module 4, and a switch module 5; the first input end of the voltage detection module 3 is electrically connected to the positive electrode of the battery, and the second input end of the voltage detection module 3 is electrically connected to the negative electrode of the battery; wherein, the voltage detection module 3 refers to a module capable of detecting the battery voltage. Since the voltage detection module 3 is electrically connected to both the positive and negative electrodes of the battery, it can detect the battery voltage.

[0033] The output end of the voltage detection module 3 is electrically connected to the input end of the voltage comparison module 4. The voltage comparison module 4 is used to output a first switch control signal when the battery voltage is lower than the set voltage. The first switch control signal refers to an electrical signal indicating that the battery voltage is lower than the set voltage. The voltage comparison module 4 refers to a module that can compare the battery voltage with the set voltage and output different electrical signals based on the comparison result.

[0034] The input end of the switch module 5 is electrically connected to the output end of the voltage comparison module 4, and the output end of the switch module 5 is electrically connected to the power on / off control end of the control module 2. The switch module 5 is configured to output a shutdown control signal to the power on / off control end of the control module 2 based on the first switch control signal, so that the control module 2 controls the energy storage power supply to shut down. The switch module 5 is a module that can be turned on and off based on the received electrical signal to output different electrical signals to the power on / off control end of the control module 2.

[0035] In the above solution, voltage detection module 3 detects the battery voltage, then compares the battery voltage with a set voltage through voltage comparison module 4. When the battery voltage falls below the set voltage, a first switch control signal is output. Then, based on the first switch control signal, switch module 5 outputs a shutdown control signal to the power-on / off control terminal of control module 2, causing control module 2 to shut down the energy storage power supply. This allows the energy storage power supply to be shut down when the battery voltage falls below the set voltage, achieving automatic shutdown of the energy storage power supply. This prevents battery 1 from being depleted due to prolonged discharge, thereby ensuring the performance of battery 1. This solves the problem of battery 1's performance and life being affected by prolonged discharge.

[0036] In an optional embodiment of the present invention, as Figure 1 As shown, the voltage comparison circuit includes a Zener diode 41, the cathode of the Zener diode 41 is electrically connected to the output end of the voltage detection module 3, and the anode of the Zener diode 41 is electrically connected to the input end of the switch module 5. The Zener diode 41 is used to cut off when the battery voltage is lower than the set voltage.

[0037] The Zener diode 41 is a voltage-stabilizing diode that exploits the reverse breakdown state of a PN junction, where the current can vary over a wide range while the voltage remains essentially constant. The Zener diode 41 is a semiconductor device that maintains a very high resistance up to a critical reverse breakdown voltage. At this critical breakdown point, the reverse resistance decreases to a very low value. Therefore, by properly configuring the Zener diode 41, it can be cut off when the battery voltage is below a set voltage and break down when the battery voltage is greater than or equal to the set voltage.

[0038] In an optional embodiment of the present utility model, the voltage detection module 3 includes a first voltage-dividing resistor 31 and a second voltage-dividing resistor 32, one end of the first voltage-dividing resistor 31 is electrically connected to the positive pole of the battery, the other end of the first voltage-dividing resistor 31 is electrically connected to one end of the second voltage-dividing resistor 32, and the other end of the second voltage-dividing resistor 32 is electrically connected to the negative pole of the battery; the cathode of the voltage-regulating diode 41 is electrically connected between the first voltage-dividing resistor 31 and the second voltage-dividing resistor 32.

[0039] The first voltage-dividing resistor 31 and the second voltage-dividing resistor 32 can achieve voltage division to detect the battery voltage. The voltage reaching the Zener diode 41 is the voltage value of the battery 1 after the voltage is divided by the first voltage-dividing resistor 31 and the second voltage-dividing resistor 32. Specifically, when the battery voltage is a preset voltage, the voltage reaching the Zener diode 41 after the preset voltage is divided by the first voltage-dividing resistor 31 and the second voltage-dividing resistor 32 is the critical reverse breakdown voltage of the Zener diode 41. This ensures that the Zener diode 41 is cut off when the battery voltage is less than the preset voltage, and breaks down and conducts when the battery voltage is greater than or equal to the preset voltage.

[0040] In an optional embodiment of the present invention, as Figure 1As shown, the switch module 5 includes a first switch submodule 51 and a second switch submodule 52. The input terminal of the first switch submodule 51 serves as the input terminal of the switch module 5 and is electrically connected to the output terminal of the voltage comparison module 4. When the voltage comparison module 4 includes a Zener diode 41, the input terminal of the first switch submodule 51 is electrically connected to the anode of the Zener diode 41. The output terminal of the first switch submodule 51 is electrically connected to the input terminal of the second switch submodule 52. The first switch submodule 51 is configured to shut down based on a first switch control signal and output a second switch control signal, which is an electrical signal instructing the first switch submodule 51 to shut down. The output terminal of the second switch submodule 52 is electrically connected to the power-on / off control terminal of the control module 2. The second switch submodule 52 is configured to turn on based on the second switch control signal and output a shutdown control signal. Therefore, when the battery voltage falls below a set value, the voltage comparison module 4 outputs the first switch control signal to shut down the first switch submodule 51. At this time, the second switch submodule 52 turns on to output a shutdown control signal, shutting down the energy storage power supply.

[0041] Based on the above embodiment, the first switch submodule 51 includes a first MOS transistor 511, which is an NMOS transistor. The gate of the first MOS transistor 511 is electrically connected to the output terminal of the voltage comparison module 4. When the voltage comparison module 4 includes a Zener diode 41, the gate of the first MOS transistor 511 is electrically connected to the anode of the Zener diode 41. The source of the first MOS transistor 511 is electrically connected to ground, and the drain of the first MOS transistor 511 is electrically connected to the input terminal of the second switch submodule 52. Therefore, when the Zener diode 41 is cut off, the first MOS transistor 511 is turned off. When the Zener diode 41 breaks down and turns on, the first MOS transistor 511 is turned on. Thus, the first MOS transistor 511 can be turned on and off according to the on and off conditions of the Zener diode 41.

[0042] In an optional embodiment of the present invention, as Figure 1 As shown, the first switch submodule 51 further includes a current-limiting resistor 512, which is connected in series between the gate of the first MOS transistor 511 and ground. Connecting the resistor in series with the gate of the first MOS transistor 511 can effectively limit the drive current and eliminate oscillation signals, making the cutoff of the first MOS transistor 511 more reliable.

[0043] In an optional embodiment of the present utility model, the shutdown control signal is a low-level signal, and the second switch sub-module 52 includes a first transistor 521 and a voltage providing unit 522. The first transistor 521 is an NPN transistor, and the voltage providing unit 522 is used to provide a conduction voltage for the first transistor 521; the base of the first transistor 521 is electrically connected to the drain of the first MOS tube 511, the emitter of the first transistor 521 is electrically connected to the ground, and the collector of the first transistor 521 is electrically connected to the power on / off control terminal of the control module 2.

[0044] The voltage providing unit 522 is a unit that can provide a voltage that turns on the first transistor 521. Under the action of the voltage providing unit 522, if the first MOS transistor 511 is turned off, the turn-on voltage provided by the voltage providing unit 522 can turn on the first MOS transistor 511. At this time, the collector of the first transistor 521 outputs a low-level signal to the power-on / off control terminal of the control module 2, so that the level of the power-on / off control terminal of the control module 2 is pulled low, thereby causing the energy storage power supply to automatically shut down.

[0045] Based on the above embodiment, the voltage providing unit 522 includes a third voltage-dividing resistor 5221 and a fourth voltage-dividing resistor 5222, one end of the third voltage-dividing resistor 5221 is electrically connected to the positive electrode of the battery, the other end of the third voltage-dividing resistor 5221 is electrically connected to one end of the fourth voltage-dividing resistor 5222, and the other end of the fourth voltage-dividing resistor 5222 is electrically connected to the negative electrode of the battery; the base of the first transistor 521 is electrically connected between the third voltage-dividing resistor 5221 and the fourth voltage-dividing resistor 5222.

[0046] Among them, since the third voltage-dividing resistor 5221 and the fourth voltage-dividing resistor 5222 are connected in series between the positive electrode and the negative electrode of the battery, and the base of the first transistor 521 is electrically connected between the third voltage-dividing resistor 5221 and the fourth voltage-dividing resistor 5222, the voltage-dividing effect of the third voltage-dividing resistor 5221 and the fourth voltage-dividing resistor 5222 can provide a conduction voltage for the base of the first transistor 521, thereby providing a conduction condition for the first transistor 521.

[0047] The following is a specific example illustrating the principles of the present invention: The battery protection circuit detects the battery voltage by dividing the voltage between a first voltage-dividing resistor 31 and a second voltage-dividing resistor 32. When the battery voltage is lower than a set voltage, the voltage-stabilizing diode 41 is cut off, and the first MOS transistor 511 is turned off, thereby turning on the first transistor 521. The voltage level at the power-on / off control terminal of the control module 2 is pulled low, causing the energy storage power supply to automatically shut down. When the battery voltage is higher than or equal to the set voltage, the voltage-stabilizing diode 41 breaks down and turns on, turning on the first MOS transistor 511, thereby turning off the first transistor 521. The voltage level at the power-on / off control terminal of the control module 2 is not affected by the battery protection circuit, and the energy storage power supply operates normally. The present invention detects the battery voltage through resistor voltage division and then uses a voltage-stabilizing diode 41 with an appropriate voltage-stabilizing value to set the low-voltage protection value of the battery 1. This effectively protects the battery 1 from over-discharge and thus ensures the performance of the battery 1. At the same time, the first transistor 521 is used to lower the power level of the power on / off control terminal of the control module 2 to realize automatic shutdown of the energy storage power supply, thereby reducing power loss, shortening the power-on time of electronic components, and extending the service life of the equipment.

[0048] Example 2

[0049] The second embodiment of the present invention provides an energy storage power supply, such as Figure 1 As shown, the energy storage power supply includes a battery 1 and a control module 2. Battery 1 includes a positive electrode and a negative electrode. Control module 2 is used to control the power supply on and off. Specifically, control module 2 includes a power on / off control terminal. When the power on / off control terminal of control module 2 is at a low level, control module 2 controls the power supply to shut down. Preferably, control module 2 includes a switching power supply chip, and the power on / off control terminal is the COMP pin of the switching power supply chip.

[0050] Example 3

[0051] A third embodiment of the present invention provides a recreational vehicle, which includes the energy storage power supply according to any embodiment of the present invention.

[0052] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this utility model can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this utility model can be achieved. This is not limited herein.

[0053] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A battery protection circuit for an energy storage power supply, wherein the energy storage power supply comprises a battery and a control module, wherein the battery comprises a positive electrode and a negative electrode, and the control module is used to control the power on and off of the energy storage power supply, characterized in that: The battery protection circuit includes a voltage detection module, a voltage comparison module, and a switch module; The first input end of the voltage detection module is electrically connected to the positive electrode of the battery, and the second input end of the voltage detection module is electrically connected to the negative electrode of the battery; The output end of the voltage detection module is electrically connected to the input end of the voltage comparison module, and the voltage comparison module is used to output a first switch control signal when the battery voltage is lower than a set voltage; The input end of the switch module is electrically connected to the output end of the voltage comparison module, and the output end of the switch module is electrically connected to the power on / off control end of the control module. The switch module is used to output a shutdown control signal to the power on / off control end of the control module based on the first switch control signal, so that the control module controls the energy storage power supply to shut down.

2. The battery protection circuit according to claim 1, characterized in that: The voltage comparison module includes a zener diode, the cathode of the zener diode is electrically connected to the output end of the voltage detection module, the anode of the zener diode is electrically connected to the input end of the switch module, and the zener diode is used to cut off when the battery voltage is lower than the set voltage.

3. The battery protection circuit according to claim 2, characterized in that: The voltage detection module includes a first voltage-dividing resistor and a second voltage-dividing resistor, one end of the first voltage-dividing resistor is electrically connected to the positive electrode of the battery, the other end of the first voltage-dividing resistor is electrically connected to one end of the second voltage-dividing resistor, and the other end of the second voltage-dividing resistor is electrically connected to the negative electrode of the battery; The cathode of the voltage-stabilizing diode is electrically connected between the first voltage-dividing resistor and the second voltage-dividing resistor.

4. The battery protection circuit according to any one of claims 1 to 3, characterized in that: The switch module includes a first switch submodule and a second switch submodule; The input end of the first switch submodule is electrically connected to the output end of the voltage comparison module, the output end of the first switch submodule is electrically connected to the input end of the second switch submodule, and the first switch submodule is configured to be turned off based on the first switch control signal to output the second switch control signal; The output end of the second switch submodule is electrically connected to the power on / off control end of the control module. The second switch submodule is configured to be turned on based on the second switch control signal to output the shutdown control signal.

5. The battery protection circuit according to claim 4, characterized in that: The first switch submodule includes a first MOS transistor, which is an NMOS transistor. The gate of the first MOS transistor is electrically connected to the output end of the voltage comparison module, the source of the first MOS transistor is electrically connected to the ground, and the drain of the first MOS transistor is electrically connected to the input end of the second switch submodule.

6. The battery protection circuit according to claim 5, characterized in that: The shutdown control signal is a low-level signal, the second switch submodule includes a first transistor and a voltage providing unit, the first transistor is an NPN transistor, and the voltage providing unit is used to provide a conduction voltage for the first transistor; The base of the first transistor is electrically connected to the drain of the first MOS transistor, the emitter of the first transistor is electrically connected to the ground, and the collector of the first transistor is electrically connected to the power on / off control terminal of the control module.

7. The battery protection circuit according to claim 6, characterized in that: The voltage providing unit includes a third voltage-dividing resistor and a fourth voltage-dividing resistor, one end of the third voltage-dividing resistor is electrically connected to the positive electrode of the battery, the other end of the third voltage-dividing resistor is electrically connected to one end of the fourth voltage-dividing resistor, and the other end of the fourth voltage-dividing resistor is electrically connected to the negative electrode of the battery; The base of the first transistor is electrically connected between the third voltage-dividing resistor and the fourth voltage-dividing resistor.

8. The battery protection circuit according to claim 5, characterized in that: The first switch submodule further includes a current-limiting resistor, which is connected in series between the gate of the first MOS transistor and the ground.

9. An energy storage power supply, comprising a battery and a control module, wherein the battery comprises a positive electrode and a negative electrode, and the control module is used to control the power on and off of the energy storage power supply, characterized in that: It also includes the battery protection circuit according to any one of claims 1 to 8.

10. A recreational vehicle, characterized in that: Including the energy storage power supply described in claim 9.

Images