A lithium battery charge and discharge management system with uninterrupted power supply

Abstract

The present application relates to a lithium battery charge and discharge management system with uninterrupted power supply, which includes a battery module, an input switch module, a charging control module and a power-off control module. The input switch module is connected to the power input terminal and the battery module, and the input switch module is configured to control the on or off of the power connected to the power input terminal; the charging control module is connected to the battery module, and the charging control module is used to detect the voltage of the battery module and control the charging of the battery module; the power-off control module is connected to the power input terminal and the charging control module respectively, and the power-off control module is configured to control the input switch module to turn off when the power voltage connected to the power input terminal is lower than the charging voltage set in the charging control module. The present application uses the battery module to continue to provide the working voltage when the system loses power, and can still smoothly and uninterruptedly achieve stable output when the input power fails, which has the effect of stabilizing the power supply of the equipment.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery charge and discharge management, and in particular to a lithium battery charge and discharge management system with uninterrupted power supply. Background Art

[0002] In emergency equipment in major public places, lithium batteries are used as energy storage power sources to ensure that lithium battery-assisted emergency equipment can work normally and protect people's daily life safety. Therefore, the reliability requirements for power supply in emergency equipment become particularly important.

[0003] At present, some existing emergency equipment also uses an external AC power supply to provide working voltage. When the voltage of the external AC power supply suddenly disappears, the lithium battery inside the emergency equipment starts working to provide working voltage.

[0004] With respect to the above-mentioned related technologies, when the lithium battery is started, the power supply voltage in the device will suddenly change, resulting in the defect of unstable power supply when the device is working. Summary of the invention

[0005] In order to achieve stable power supply when the device is working, the present application provides a lithium battery charge and discharge management system with uninterrupted power supply.

[0006] The present application provides a lithium battery charge and discharge management system with uninterrupted power supply, which adopts the following technical solution.

[0007] A lithium battery charge and discharge management system with uninterrupted power supply, characterized by comprising:

[0008] A battery module, wherein the battery module is used to provide an operating voltage;

[0009] An input switch module, the input switch module is connected to the power input terminal and the battery module, and the input switch module is configured to control the on or off of the power connected to the power input terminal;

[0010] A charging control module, the charging control module is connected to the battery module, and the charging control module is used to detect the voltage of the battery module and control the charging of the battery module;

[0011] A power-off control module, the power-off control module is connected to the power input terminal and the charging control module respectively, and the power-off control module is configured to control the input switch module to turn off when it is detected that the power voltage connected to the power input terminal is lower than the charging voltage set in the charging control module,

[0012] A charging switch module, the charging switch module is connected to the battery module and is grounded;

[0013] The charging control module includes a statistical unit, which is used to count the number of times the charging switch module is turned on. When the statistical number reaches a preset value, the statistical unit controls the power-off control module to enter a disabled state, and the input switch module is turned off when the power-off control module is in the disabled state; when the charging control module detects that the voltage of the battery module is lower than a preset value, the power-off control module is controlled to enter an enabled state, and the input switch module is turned on when the power-off control module is in the enabled state and the power-off control module detects a voltage higher than the charging voltage of the charging control module; the statistical unit resets the statistical number when the input switch module is turned on.

[0014] By adopting the above technical solution, when a power source is also connected to the power input end, the power source connected to the power input end is used as the main power source, and the battery module is used as the backup power source, and the power supply is switched through the input switch module. When the input voltage is greater than the charging voltage set by the charging control module, the input voltage is used to directly provide the working voltage of the device on the one hand, and to charge the battery module on the other hand. When the input voltage is lower than the charging voltage, the input voltage is disconnected by closing the input switch module, and the battery module is used to continue to provide the working voltage. When the input power is off, stable output can still be achieved smoothly and uninterruptedly.

[0015] Optionally, it also includes a charging switch module, which is connected to the battery module and grounded; the charging switch module is configured to control the conduction or disconnection of the circuit where the battery module is located; the charging control module is configured to control the charging switch module to be turned on when the power-off control module controls the input switch module to be turned off; the charging control module is also configured to control the charging switch module to be turned off when the power-off control module controls the input switch module to be turned on.

[0016] By adopting the above technical solution, the charging switch module is used to achieve low on-resistance of the battery module during discharge, and when the input voltage is greater than the charging voltage, the charging switch module is turned off to reduce frequent floating charging of the battery module by the input power supply, thereby improving the service life of the battery module.

[0017] Optionally, a DC conversion module is further included, wherein the DC conversion module is connected to the input switch module and the battery module, and the DC conversion module is configured to convert the voltage received by the input switch module or the voltage output by the battery module.

[0018] By adopting the above technical solution, a DC conversion module is used to convert the connected power supply voltage or the voltage output by the battery module to obtain different output voltages.

[0019] Optionally, the charging control module includes a statistical unit, which is used to count the number of times the charging switch module is turned on. The statistical unit is configured to control the input switch module to be continuously turned off through the power-off control module when the statistical number reaches a preset value, and to continuously discharge the battery module by controlling the charging switch module to be continuously turned on.

[0020] By adopting the above technical solution, the statistical unit is used to count the number of times the charging switch module is turned on, so as to obtain the number of times the battery module is used. After the battery module is used multiple times, the input switch module is continuously turned off, and the charging switch module is continuously turned on, so that the battery module is deeply discharged, thereby activating the activity of the battery module and improving the service life of the battery module.

[0021] Optionally, the statistical unit controls the power-off control module to enter a disabled state when the statistical number reaches a preset value, and the input switch module is turned off when the power-off control module is in the disabled state; the charging control module controls the power-off control module to enter an enabled state when it detects that the voltage of the battery module is lower than a preset value, and the input switch module is turned on when the power-off control module is in the enabled state and the power-off control module detects a voltage higher than the voltage of the battery module; the statistical unit resets the statistical number when the input switch module is turned on.

[0022] By adopting the above technical solution, when the statistical unit is used to perform deep discharge on the battery module, the power-off control module is controlled to be in a disabled state to maintain the shutdown state of the input switch module, thereby ensuring that the battery module can continue to perform deep discharge. And after the deep discharge, the statistical number is reset to achieve interval deep discharge of the battery module.

[0023] Optionally, the charging switch module is an NMOS tube.

[0024] Optionally, the power-off control module includes a filtering unit, and the filtering unit is used to stabilize the voltage connected to the power input terminal.

[0025] By adopting the above technical solution, the filter unit provided in the power-off control module is used to stabilize the voltage connected to the power input terminal, so as to reduce the problem of large errors in input voltage detection caused by frequent fluctuations in the input power voltage.

[0026] Optionally, the input switch module is a PMOS tube.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The input voltage is disconnected by turning off the input switch module, and the battery module is used to continue to provide the working voltage. When the input power fails, the stable output can be achieved smoothly and uninterruptedly, thereby stabilizing the power supply of the equipment.

[0029] 2. It can deeply discharge the battery module, so as to activate the activity of the battery module under long-term floating charge and improve the service life of the battery module.

[0030] 3. It can stabilize the voltage connected to the power input terminal to reduce the problem of large errors in input voltage detection caused by frequent fluctuations in the input power voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a module composition diagram of a lithium battery charge and discharge management system with uninterrupted power supply according to an embodiment of the present application.

[0032] Figure 2 It is a circuit module schematic diagram of a lithium battery charge and discharge management system with uninterrupted power supply according to an embodiment of the present application.

[0033] Explanation of the accompanying drawings: 1. Battery module; 2. Input switch module; 3. Charging control module; 31. Statistics unit; 4. Power-off control module; 41. Filter unit; 5. Charging switch module; 6. DC conversion module. DETAILED DESCRIPTION

[0034] The present application is further described in detail below in conjunction with the accompanying drawings.

[0035] The present application embodiment discloses a lithium battery charge and discharge management system with uninterrupted power supply. Figure 1 and Figure 2 The uninterruptible power supply lithium battery charge and discharge management system includes a battery module 1, an input switch module 2, a charging control module 3, a power-off control module 4, a charging switch module 5 and a DC conversion module 6.

[0036] The input switch module 2 is connected to the power input terminal and is also connected to the DC conversion module 6. After the external input power supply voltage is turned on by the input switch module 2, the DC conversion module 6 performs voltage conversion and outputs the working voltage, thereby supplying power to the inside of the device. The battery module 1 is connected to the connection node between the input switch module 2 and the DC conversion module 6, and is also connected to the charging switch module 5, and the charging switch module 5 is grounded. When the charging switch module 5 is turned on, the electric energy output by the battery module 1 is supplied after passing through the DC conversion module 6. The power-off control module 4 is connected to the power input terminal and is also connected to the input switch module 2. The power-off control module 4 detects the input power supply voltage on the one hand and controls the on and off of the input switch module 2 on the other hand. The charging control module 3 is simultaneously connected to the power-off control module 4, the battery module 1 and the charging switch module 5. The charging control module 3 detects the voltage value of the battery module 1, and the charging control module 3 can also control the on or off of the charging switch module 5.

[0037] After the power input terminal is connected to the power supply, the power failure detection module detects the connected power supply voltage. When the detected power supply voltage is lower than the minimum charging voltage set in the charging control module 3, the power failure control module 4 controls the input switch module 2 to turn off, and the charging control module 3 controls the charging switch module 5 to turn on. At this time, the external input power supply voltage can no longer provide electrical energy, and the output working voltage is provided by the battery module 1.

[0038] When the detected power supply voltage is higher than or equal to the minimum charging voltage set in the charging control module 3, the power-off control module 4 controls the input switch module 2 to be turned on. At this time, the external input power supply voltage is output through the DC conversion module 6 on the one hand, and can also charge the battery module 1 on the other hand.

[0039] In this embodiment, the charging switch module 5 is an NMOS tube, and the input switch module 2 is a PMOS tube.

[0040] Therefore, when the detected power supply voltage is higher than or equal to the minimum charging voltage set in the charging control module 3, the voltage value of the battery module 1 is detected by the charging control module 3. When the power supply voltage is greater than the voltage value of the battery module 1, the charging switch module 5 is turned on, and the external power supply charges the battery module 1. When the power supply voltage is lower than or equal to the voltage of the battery module 1, the charging switch module 5 is turned off, and the power supply voltage only provides the working voltage, and the battery module 1 is not charged.

[0041] In this embodiment, the charging control module 3 includes a statistical unit 31, which is used to count the number of times the battery module 1 is turned on. Since the battery module 1 needs to turn on the charging switch module 5 during the charging and discharging process, the total number of times the battery module 1 is charged and discharged can be obtained by counting the number of times the charging switch module 5 is turned on. In this embodiment, the battery module 1 uses a lithium battery, and the activity of the lithium battery will decrease after multiple floating charges and discharges.

[0042] When the statistical unit 31 counts the number of times the charging switch module 5 is turned on to reach a preset value, the power-off control module 4 controls the input switch module 2 to be continuously turned off, and controls the charging switch module 5 to be continuously turned on, so as to continuously discharge the battery module 1, so as to achieve a deep discharge effect and improve the activity of the lithium battery.

[0043] Specifically, when the statistical number of times of the statistical unit 31 reaches a preset value, the power-off control module 4 is controlled to enter the disabled state. In the disabled state, the input switch module 2 is in the off state. And regardless of the voltage of the input power supply, the input switch module 2 is always in the off state, thereby ensuring that the battery module 1 can continue to discharge.

[0044] To ensure that the battery module 1 will not be over-discharged, when the charging control module 3 detects that the voltage of the battery module 1 gradually decreases to below the preset value, the charging control module 3 controls the power-off control module 4 to enter the enabled state. In the enabled state and when the voltage detected by the power-off control module 4 is higher than the charging voltage set by the charging control module 3, the input switch module 2 is in the on state, and the power supply voltage provides the working voltage on the one hand and charges the battery module 1 on the other hand. The statistical unit 31 resets the statistical number when the input switch module 2 is turned on, so as to repeat the statistical number later, thereby realizing the intermittent deep charging and discharging of the battery module 1.

[0045] In this embodiment, the power-off control module 4 includes a filter unit 41 , and the filter unit 41 is used to stabilize the voltage connected to the power input terminal.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A lithium battery charge and discharge management system with uninterrupted power supply, characterized in that: include: A battery module (1), the battery module (1) being used to provide an operating voltage; An input switch module (2), the input switch module (2) being connected to the power input terminal and the battery module (1), the input switch module (2) being configured to control the on or off of the power source connected to the power input terminal; A charging control module (3), the charging control module (3) being connected to the battery module (1), the charging control module (3) being used to detect the voltage of the battery module (1) and control the charging of the battery module (1); A power-off control module (4), the power-off control module (4) being connected to the power input terminal and the charging control module (3) respectively, the power-off control module (4) being configured to control the input switch module (2) to turn off when it is detected that the power voltage connected to the power input terminal is lower than the charging voltage set in the charging control module (3), A charging switch module (5), the charging switch module (5) being connected to the battery module (1), and the charging switch module (5) being grounded; The charging control module (3) comprises a statistical unit (31), the statistical unit (31) being used to count the number of times the charging switch module (5) is turned on; when the statistical number reaches a preset value, the statistical unit (31) controls the power-off control module (4) to enter a disabled state, and the input switch module (2) is turned off when the power-off control module (4) is in the disabled state; when the charging control module (3) detects that the voltage of the battery module (1) is lower than a preset value, the power-off control module (4) is controlled to enter an enabled state, and the input switch module (2) is turned on when the power-off control module (4) is in the enabled state and the voltage detected by the power-off control module (4) is higher than the charging voltage of the charging control module (3); and the statistical unit (31) resets the statistical number when the input switch module (2) is turned on.

2. The uninterruptible power supply lithium battery charge and discharge management system according to claim 1, characterized in that: The charging switch module (5) is configured to control the conduction or disconnection of the circuit where the battery module (1) is located; the charging control module (3) is configured to control the charging switch module (5) to be turned on when the power-off control module (4) controls the input switch module (2) to be turned off; the charging control module (3) is also configured to control the charging switch module (5) to be turned off when the power-off control module (4) controls the input switch module (2) to be turned on.

3. The uninterruptible power supply lithium battery charge and discharge management system according to claim 2, characterized in that: It also comprises a DC conversion module (6), which is connected to the input switch module (2) and the battery module (1), and is configured to convert the voltage received by the input switch module (2) or the voltage output by the battery module (1).

4. The uninterruptible power supply lithium battery charge and discharge management system according to claim 2, characterized in that: The statistical unit (31) is configured to control the input switch module (2) to be continuously turned off through the power-off control module (4) when the statistical number of times reaches a preset value, and to control the charging switch module (5) to be continuously turned on to continuously discharge the battery module (1).

5. The uninterruptible power supply lithium battery charge and discharge management system according to claim 2, characterized in that: The charging switch module (5) is an NMOS tube.

6. The uninterruptible power supply lithium battery charge and discharge management system according to claim 1, characterized in that: The power-off control module (4) comprises a filter unit (41), and the filter unit (41) is used to stabilize the voltage connected to the power input terminal.

7. The uninterruptible power supply lithium battery charge and discharge management system according to claim 1, characterized in that: The input switch module (2) is a PMOS tube.

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