Lead-acid mobile power supply

Abstract

The utility model relates to a lead-acid mobile power supply, and relates to the technical field of mobile power supplies, and the lead-acid mobile power supply comprises a battery pack and a circuit board. A discharging circuit is arranged on the circuit board and is electrically connected with the battery pack; a signal acquisition circuit is also arranged on the circuit board and is used for acquiring a current signal of the discharging circuit; the circuit board is further provided with a main control chip, the signal acquisition circuit and the discharging circuit are electrically connected with the main control chip, and the main control chip is used for receiving current signals of the signal acquisition circuit and controlling on-off of the discharging circuit. Through the arrangement of the information acquisition circuit and the main control chip, when overcurrent of the discharge circuit is detected, the main control chip can cut off the discharge circuit in time, and overcurrent protection of the battery pack is realized.

Description

Technical Field

[0001] The present application relates to the technical field of mobile power supplies, and in particular to a lead-acid mobile power supply. Background Art

[0002] Lead-acid mobile power supply is a mobile power supply device that uses lead-acid batteries as energy storage units. It has the advantages of small size, large capacity, long life, and simple maintenance, and is widely used in power, communication, transportation, energy storage and other fields.

[0003] At present, common lead-acid mobile power supplies mainly include battery packs, battery management systems and shells. The battery pack is composed of multiple lead-acid battery cells and is the main energy storage unit of the mobile power supply. The battery management system is mainly a circuit board and corresponding circuits, which control the current and voltage output by the battery to ensure the safety and stable operation of the battery pack; it also has a charging and discharging system, which mainly installs charging and discharging interfaces on the circuit board to realize the charging of the power supply and charging of other devices. The shell is used to protect the internal battery pack and battery management system.

[0004] With respect to the above-mentioned related technologies, after the above-mentioned lead-acid mobile power supply is used for a long time, various problems will occur in the battery management system of the lead-acid mobile power supply. The most common one is the aging of electrical components or damage of some electrical components, which can easily lead to unstable power output current or even overcurrent, which greatly reduces the safety of the lead-acid mobile power supply and the equipment charged by the lead-acid mobile power supply. Utility Model Content

[0005] The present application provides a lead-acid mobile power supply, the purpose of which is to improve the overcurrent protection capability of the lead-acid mobile power supply, thereby improving the safety of the lead-acid mobile power supply.

[0006] The present application provides a lead-acid mobile power supply adopting the following technical solution:

[0007] A lead-acid mobile power source comprises a battery pack and a circuit board; a discharge circuit is arranged on the circuit board, and the discharge circuit is electrically connected to the battery pack; a signal acquisition circuit is also arranged on the circuit board, and is used to acquire a current signal of the discharge circuit; a main control chip is also arranged on the circuit board, and the signal acquisition circuit and the discharge circuit are both electrically connected to the main control chip, and the main control chip is used to receive the current signal of the signal acquisition circuit and control the on and off of the discharge circuit.

[0008] By adopting the above technical solution, the battery pack is used to store electricity, and a discharge circuit is provided on the circuit board, and the discharge circuit is electrically connected to the battery pack, so that the external device can be connected to the battery pack through the discharge circuit, so that the battery pack can charge the external device. The signal acquisition circuit and the main control chip are arranged in coordination, so that the signal acquisition circuit can collect the current signal of the discharge circuit and send the current signal to the main control chip, so that the main control chip can control the on and off of the discharge circuit according to the received current signal.

[0009] Therefore, when the battery pack is charging an external device, when an overcurrent in the discharge circuit is detected, the main control chip can cut off the discharge circuit in time to achieve overcurrent protection for the battery pack.

[0010] Optionally, the signal acquisition circuit includes a shunt resistor, a detection resistor and a detection capacitor, the detection resistor is connected in series with the detection capacitor, and the detection resistor and the detection capacitor are simultaneously connected in parallel with the shunt resistor; one end of the shunt resistor is electrically connected to the main control chip, and the other end is electrically connected to the discharge circuit.

[0011] By adopting the above technical solution, the signal acquisition circuit can reduce the intensity of the current signal received by the main control chip through the shunt resistor, ensuring that the current signal is within the range that the main control chip can detect. The setting of the detection capacitor can reduce interference. Therefore, the current signal of the discharge circuit can be transmitted to the main control chip through the shunt resistor, the detection resistor and the detection capacitor, and then the main control chip can detect the current in the discharge circuit.

[0012] Optionally, the signal acquisition circuit also includes a thermistor and a temperature acquisition circuit, the thermistor is electrically connected to the discharge circuit; the temperature acquisition circuit is electrically connected to the main control chip, and the temperature acquisition circuit is used to collect the temperature of the thermistor and send it to the main control chip.

[0013] By adopting the above technical solution and setting the thermistor, when the discharge circuit is overcurrent, the current passing through the thermistor increases, causing the temperature of the thermistor to increase, and at the same time, the resistance of the thermistor increases, that is, the discharge circuit can be indicated to be in an overcurrent state by increasing the temperature of the thermistor, and the thermistor can also increase its resistance to reduce the current in the discharge circuit, thereby protecting the discharge circuit.

[0014] On this basis, the temperature acquisition circuit will send the temperature of the thermistor to the main control chip, and the main control chip will cut off the discharge circuit according to the detection result to achieve overcurrent protection of the discharge circuit. Since the main control chip is not directly connected to the discharge circuit, the possibility of the main control chip being burned by the discharge circuit can be reduced.

[0015] Optionally, the discharge circuit includes a USB interface and a DC interface.

[0016] By adopting the above technical solution, the discharge circuit includes two types: a USB interface and a DC interface, thereby increasing the application scope of the lead-acid mobile power supply of the present application.

[0017] Optionally, the signal acquisition circuit includes a first acquisition circuit and a second acquisition circuit, the first acquisition circuit is electrically connected to the DC interface, and the first acquisition circuit is used to collect the current signal of the DC interface and send it to the main control chip; the second acquisition circuit is electrically connected to the USB interface, and the second acquisition circuit is used to collect the current signal of the USB interface and send it to the main control chip.

[0018] By adopting the above technical solution, the signal acquisition circuit includes a first acquisition circuit and a second acquisition circuit, the first acquisition circuit acquires the DC interface current signal to realize overcurrent detection of the DC interface, and the second acquisition circuit acquires the USB interface current signal to realize overcurrent detection of the USB interface.

[0019] Optionally, there are multiple USB interfaces and multiple DC interfaces, the first acquisition circuit is connected in series with each DC interface, and multiple DC interfaces are connected in parallel; the second acquisition circuit is connected in series with each USB interface, and multiple USB interfaces are connected in parallel.

[0020] By adopting the above technical solution, the DC interfaces are connected in parallel with each other, and each DC interface is connected in series with the first acquisition circuit, so that several DC interfaces can discharge at the same time, and the first acquisition circuit can also detect the current of several DC interfaces at the same time. The USB interfaces are connected in parallel with each other, and each USB interface is connected in series with the second acquisition circuit, so that several USB interfaces can discharge at the same time, and the second acquisition circuit can also detect the current of several USB interfaces at the same time.

[0021] Optionally, a charging circuit is also provided on the circuit board, and the charging circuit is electrically connected to the battery pack; a charging protection circuit is also provided on the circuit board, and the charging protection circuit is used to collect the current signal of the charging circuit; the charging protection circuit is electrically connected to the main control chip, and the main control chip is used to receive the current signal of the charging protection circuit and control the on and off of the charging circuit.

[0022] By adopting the above technical solution, firstly, the charging circuit is electrically connected to the battery pack, so the battery pack can be charged. Secondly, the setting of the charging protection circuit can detect the current of the charging circuit and send the current signal to the main control chip, and the main control chip is electrically connected to the charging circuit, so the main control chip can control the on and off of the charging circuit according to the received current signal.

[0023] Therefore, when overcurrent occurs, the main control chip can cut off the charging circuit in time to protect the battery pack.

[0024] Optionally, the charging protection circuit includes a pre-voltage drop detection unit, a post-voltage drop detection unit and a voltage drop resistor unit, and the voltage drop resistor unit is electrically connected to the charging circuit; the pre-voltage drop detection unit and the post-voltage drop detection unit respectively collect electrical signals at both ends of the voltage drop resistor unit and send the electrical signals to the main control chip.

[0025] By adopting the above technical solution, the voltage-dropping resistor unit in the charging protection circuit is electrically connected to the charging circuit, and the voltage-dropping detection unit and the voltage-dropping detection unit can both send the detected electrical signals to the main control chip, and the main control chip can then judge the state of the discharge circuit based on the two electrical signals. When the charging circuit is overcurrent, the electrical signals on both sides of the voltage-dropping resistor unit suddenly change, so the main control chip can control the charging circuit to disconnect based on the detection results, thereby realizing overcurrent protection during the battery pack charging process.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. This application uses the information collection circuit and the main control chip to set up. When the discharge circuit is detected to be overcurrent, the main control chip can cut off the discharge circuit in time to achieve overcurrent protection of the battery pack.

[0028] 2. This application implements charging protection of the battery pack by setting up a charging protection circuit and a main control chip. When an overcurrent is detected in the charging circuit, the main control chip can cut off the charging circuit in time to achieve charging protection for the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the lead-acid mobile power supply of Example 1 of the present application.

[0030] Figure 2 It is a schematic diagram of the overall internal structure of the lead-acid mobile power supply of Example 1 of the present application.

[0031] Figure 3 It is a connection block diagram between the charging circuit, battery pack, discharge circuit, charging protection circuit, signal acquisition circuit and main control chip of Example 1 of the present application.

[0032] Figure 4 It is a connection block diagram of the discharge circuit, the first acquisition circuit and the main control chip of Example 1 of the present application.

[0033] Figure 5 It is a connection block diagram of the main control chip and the second acquisition circuit in Example 1 of the present application.

[0034] Figure 6 It is a connection block diagram of the charging protection circuit, charging circuit, battery pack and main control chip of Example 1 of the present application.

[0035] In the figure, 1. battery pack; 11. shell; 111. hand ring; 112. buffer pad; 12. LED board; 2. circuit board; 21. interactive hardware; 211. hardware switch; 212. charging indicator light; 213. charging interface; 214. discharge interface; 215. power indicator light; 216. LED switch; 3. discharge circuit; 31. USB interface; 32. DC interface; 4. signal acquisition circuit; 41. shunt resistor; 42. detection resistor; 43. detection capacitor; 44. first acquisition circuit; 45. second acquisition circuit; 5. main control chip; 6. charging circuit; 7. charging protection circuit; 71. pre-voltage reduction detection unit; 72. post-voltage reduction detection unit; 73. voltage reduction resistor unit. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.

[0037] Embodiment 1:

[0038] A lead-acid mobile power supply, referring to Figure 1 and Figure 2 , including a battery pack 1, a housing 11 is provided outside the battery pack 1, a circuit board 2 is provided inside the housing 11, an interactive hardware 21 is welded on the circuit board 2, the interactive hardware 21 includes a hardware switch 211, a charging indicator light 212, a charging interface 213, a plurality of discharge interfaces 214 and a plurality of power indicator lights 215, and the interactive hardware 21 is electrically connected to the circuit on the circuit board 2. A plurality of clearance grooves are provided through the protective housing 11, and the clearance grooves are arranged one by one with the interactive hardware 21, and the interactive hardware 21 is plugged and matched with the corresponding clearance grooves.

[0039] Therefore, the hardware switch 211 can control the opening and closing of the battery pack 1; the charging interface 213 can charge the battery pack 1, and the charging indicator light 212 can indicate the charging status of the battery pack 1; the discharge interface 214 can charge other devices, thereby realizing the discharge function of the battery pack 1; the setting of several power indicator lights 215 can display the power status of the battery pack 1.

[0040] Reference Figure 1 and Figure 2 The housing 11 is also provided with an LED board 12, which is electrically connected to the circuit board 2, and the circuit board 2 is provided with an LED switch 216, which is electrically connected to the circuit board 2. Therefore, the LED board 12 can be turned on and off by the LED switch 216, and the LED board 12 can be used for lighting and can also be used for displaying the status of the lead-acid mobile power supply.

[0041] Reference Figure 1 and Figure 2A hand ring 111 is provided on one side of the protective shell 11, and a buffer pad 112 is provided on the other side. This facilitates the movement and placement of the lead-acid mobile power supply.

[0042] Reference Figure 3 The circuit board 2 is provided with a charging circuit 6, a charging protection circuit 7, a discharging circuit 3, a signal acquisition circuit 4 and a main control chip 5. The charging circuit 6 is electrically connected to the battery pack 1, and a charging interface 213 is provided in the charging circuit 6, so that the battery pack 1 can be charged through the charging interface 213. The discharging circuit 3 is electrically connected to the battery pack 1, and a discharging interface 214 is provided in the discharging circuit 3, so that an external device can be charged through the discharging interface 214.

[0043] Reference Figure 3 The charging protection circuit 7 is electrically connected to the charging circuit 6, and both the charging protection circuit 7 and the charging circuit 6 are electrically connected to the main control chip 5. The charging protection circuit 7 detects the current in the charging circuit 6 and sends the current signal to the main control chip 5. The main control chip 5 is electrically connected to the charging circuit 6, so the main control chip 5 can control the on and off of the charging circuit 6 according to the current signal sent by the charging protection circuit 7, thereby performing overcurrent protection on the charging process of the battery pack 1.

[0044] Reference Figure 3 The signal acquisition circuit 4 is electrically connected to the discharge circuit 3, and both the signal acquisition circuit 4 and the discharge circuit 3 are electrically connected to the main control chip 5. The signal acquisition circuit 4 detects the circuit in the discharge circuit 3 and sends the current signal to the main control chip 5. The main control chip 5 is electrically connected to the discharge circuit 3, so the main control chip 5 can control the on and off of the discharge circuit 3 according to the current signal sent by the signal acquisition circuit 4, thereby performing overcurrent protection on the discharge process of the battery pack 1.

[0045] Reference Figure 4 and Figure 5 The discharge interface 214 in the discharge circuit 3 of the present application includes a USB interface 31 and a DC interface 32 , so that the lead-acid mobile power supply of the present application can charge devices of the USB interface 31 and devices of the DC interface 32 .

[0046] Reference Figure 4 and Figure 5, there are several DC interfaces 32, several DC interfaces 32 are connected in series with the discharge circuit 3, and several DC interfaces 32 are connected in parallel. There are several USB interfaces 31, several USB interfaces 31 are connected in series with the discharge circuit 3, and several USB interfaces 31 are connected in parallel. In order to ensure the discharge voltage of the USB, a boost circuit can be set between the discharge circuit 3 and the USB interface 31. Therefore, several DC interfaces 32 and several USB interfaces 31 are connected in parallel, and the DC interface and the USB interface are also in a parallel state, so the lead-acid mobile power supply can charge multiple devices at the same time.

[0047] Reference Figure 4 and Figure 5 The signal acquisition circuit 4 includes a first acquisition circuit 44 and a second acquisition circuit 45. The two ends of the first acquisition circuit 44 are electrically connected to the DC interface 32 and the main control chip 5, respectively. Each DC interface 32 is electrically connected to the first acquisition circuit 44, and several DC interfaces 32 are connected in parallel. The two ends of the second acquisition circuit 45 are electrically connected to the USB interface 31 and the main control chip 5, respectively. Each USB interface 31 is electrically connected to the first acquisition circuit 44, and several USB interfaces 31 are connected in parallel. Therefore, the first acquisition circuit 44 can detect the discharge current of each DC interface 32, and similarly, the second acquisition circuit 45 can detect the current of each USB interface 31.

[0048] Reference Figure 4 and Figure 5 , the first acquisition circuit 44 and the second acquisition circuit 45 have the same composition. This embodiment is described with the first acquisition circuit 44. The first acquisition circuit 44 includes a shunt resistor 41, a detection resistor 42 and a detection capacitor 43, the detection resistor 42 is connected in series with the detection capacitor 43, and the circuit in which the detection resistor 42 and the detection capacitor 43 are connected in series is connected in parallel with the shunt resistor 41, one end of the shunt resistor 41 is electrically connected to the pin corresponding to the main control chip 5, and the other end is electrically connected to the DC interface 32; wherein a ground terminal is provided between the detection resistor 42 and the detection capacitor 43.

[0049] Therefore, the main control chip 5 can collect the current signal in the DC interface 32 in real time. When overcurrent occurs, the main control chip 5 compares the current signal with the maximum value set by itself. When the maximum value is exceeded, it indicates that the discharge circuit 3 is overcurrent. At this time, the discharge circuit 3 is cut off by the main control chip 5.

[0050] Reference Figure 4 and Figure 5 The two ends of the hardware switch 211 are electrically connected to the battery pack 1 and the main control chip 5 respectively. The closing of the hardware switch 211 is used to send a signal to the main control chip 5, that is, the main control chip 5 detects the enable signal of the hardware switch 211. Then the main control chip 5 can enable the software master switch, and the battery pack 1 can output current through the DC interface 32.

[0051] When the DC interface 32 is detected to be overcurrent or the battery pack 1 is too low, the software master switch is disabled, and the software master switch is always in a disabled state regardless of whether the hardware switch 211 is enabled. In the overcurrent state, the state of the hardware switch 211 is changed, and then the hardware switch 211 is closed again. The main control chip 5 detects the enable signal of the hardware switch 211 and can then re-enable the software master switch. In the state where the battery pack 1 is too low in power and the battery pack 1 is charged, the software master switch can be re-enabled.

[0052] Reference Figure 3 and Figure 6 The charging protection circuit 7 includes a pre-voltage drop detection unit 71, a post-voltage drop detection unit 72, and a voltage drop resistor unit 73. The voltage drop resistor unit 73 is composed of a plurality of resistors connected in parallel. Both ends of the voltage drop resistor unit 73 are electrically connected to the charging circuit 6 and the battery pack 1, respectively. Therefore, the charging current will flow through the voltage drop resistor unit 73.

[0053] Reference Figure 6 , the pre-step-down detection unit 71 and the post-step-down detection unit 72 are electrically connected to the two ends of the step-down resistor unit 73 respectively, the pre-step-down detection unit 71 and the post-step-down detection unit 72 are both composed of two resistors in series, and the output end of the pre-step-down detection unit 71 and the output end of the post-step-down detection unit 72 are both electrically connected to the corresponding pins of the main control chip 5, and the output ends of the pre-step-down detection unit 71 and the post-step-down detection unit 72 are both located between the corresponding two resistors. The two resistors in the pre-step-down detection unit 71 and the post-step-down detection unit 72 are used for voltage division to prevent the voltage connected to the pins of the main control chip 5 from being too large.

[0054] Therefore, firstly, the voltage value on the voltage-dropping resistor unit 73 can be determined through the detection result between the two pins of the main control chip 5. When overcurrent occurs, the voltage of the voltage-dropping resistor unit 73 increases, that is, the voltage difference detected by the two pins of the main control chip 5 changes suddenly, indicating that the main control chip 5 is in an overcurrent state at this time, and the main control chip 5 can cut off the charging circuit 6.

[0055] Secondly, during the charging process, the detection result between the two pins of the main control chip 5 is used to determine whether the battery pack 1 is fully charged. Specifically, when the voltage of the pin connected to the pre-voltage reduction detection unit 71 is higher than the voltage of the pin connected to the post-voltage reduction detection unit 72, it indicates that the battery pack 1 is in a charging state; when the two voltages are the same or slightly different, it indicates that the battery pack 1 is fully charged; and when the two voltages are not detected, it indicates that the battery pack 1 is not charged.

[0056] The implementation principle of the embodiment of the present application is: after the corresponding control program is burned into the main control chip 5, the current monitoring of the lead-acid mobile power supply during the discharge process can be realized through the setting of the signal acquisition circuit 4, and the charging protection circuit 7 can monitor the current during the charging process of the lead-acid mobile power supply. Therefore, the overcurrent protection of the lead-acid mobile battery can be realized through the cooperation of the signal acquisition circuit 4 and the charging protection circuit 7.

[0057] Embodiment 2:

[0058] A lead-acid mobile power supply, the difference between this embodiment and embodiment 1 is that: the signal acquisition circuit 4 includes a thermistor and a temperature acquisition circuit, the thermistor is connected to the discharge circuit 3; or one end of the thermistor is electrically connected to the discharge interface 214, and the other end is grounded. When overcurrent occurs, the temperature of the thermistor will rise. The temperature acquisition circuit is electrically connected to the main control chip 5, and the temperature acquisition circuit acquires the temperature signal of the thermistor through the temperature sensor and converts it into an electrical signal and sends it to the main control chip 5.

[0059] The implementation principle of the embodiment of the present application is: after the corresponding control program is burned into the main control chip 5, the current monitoring in the discharge circuit 3 is realized by temperature detection.

[0060] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A lead-acid mobile power supply, characterized in that: It comprises a battery pack (1) and a circuit board (2); A discharge circuit (3) is provided on the circuit board (2), and the discharge circuit (3) is electrically connected to the battery pack (1); The circuit board (2) is also provided with a signal acquisition circuit (4) for acquiring the current signal of the discharge circuit (3); A main control chip (5) is also provided on the circuit board (2); the signal acquisition circuit (4) and the discharge circuit (3) are both electrically connected to the main control chip (5); the main control chip (5) is used to receive the current signal of the signal acquisition circuit (4) and control the on / off of the discharge circuit (3).

2. A lead-acid mobile power source according to claim 1, characterized in that: The signal acquisition circuit (4) comprises a shunt resistor (41), a detection resistor (42) and a detection capacitor (43), wherein the detection resistor (42) and the detection capacitor (43) are connected in series, and the detection resistor (42) and the detection capacitor (43) are simultaneously connected in parallel with the shunt resistor (41); One end of the shunt resistor (41) is electrically connected to the main control chip (5), and the other end is electrically connected to the discharge circuit (3).

3. A lead-acid mobile power supply according to claim 1, characterized in that: The signal acquisition circuit (4) further comprises a thermistor and a temperature acquisition circuit, wherein the thermistor is electrically connected to the discharge circuit (3); The temperature acquisition circuit is electrically connected to the main control chip (5), and the temperature acquisition circuit is used to acquire the temperature of the thermistor and send it to the main control chip (5).

4. A lead-acid mobile power source according to claim 1, characterized in that: The discharge circuit (3) comprises a USB interface (31) and a DC interface (32).

5. A lead-acid mobile power source according to claim 4, characterized in that: The signal acquisition circuit (4) comprises a first acquisition circuit (44) and a second acquisition circuit (45); the first acquisition circuit (44) is electrically connected to the DC interface (32); the first acquisition circuit (44) is used to acquire the current signal of the DC interface (32) and send it to the main control chip (5); The second acquisition circuit (45) is electrically connected to the USB interface (31), and the second acquisition circuit (45) is used to acquire the current signal of the USB interface (31) and send it to the main control chip (5).

6. A lead-acid mobile power source according to claim 5, characterized in that: A plurality of the USB interfaces (31) and the DC interfaces (32) are provided, the first acquisition circuit (44) is connected in series with each of the DC interfaces (32), and a plurality of the DC interfaces (32) are connected in parallel; The second acquisition circuit (45) is connected in series with each of the USB interfaces (31), and a plurality of the USB interfaces (31) are connected in parallel.

7. A lead-acid mobile power source according to claim 1, characterized in that: The circuit board (2) is also provided with a charging circuit (6), and the charging circuit (6) is electrically connected to the battery pack (1); The circuit board (2) is also provided with a charging protection circuit (7), and the charging protection circuit (7) is used to collect the current signal of the charging circuit (6); The charging protection circuit (7) is electrically connected to the main control chip (5), and the main control chip (5) is used to receive the current signal of the charging protection circuit (7) and control the on and off of the charging circuit (6).

8. A lead-acid mobile power source according to claim 7, characterized in that: The charging protection circuit (7) comprises a pre-voltage reduction detection unit (71), a post-voltage reduction detection unit (72) and a voltage reduction resistor unit (73), and the voltage reduction resistor unit (73) is electrically connected to the charging circuit (6); The pre-voltage reduction detection unit (71) and the post-voltage reduction detection unit (72) respectively collect electrical signals at both ends of the voltage reduction resistor unit (73), and send the electrical signals to the main control chip (5).

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