Power supplementing system and method applied to mobile energy storage

Abstract

The invention relates to a mobile energy storage method and system. The system comprises a triggering device, a charger and a slow charging circuit. The triggering device is electrically connected with a mains supply end and the battery pack and is used for waking up the battery pack when being triggered; the battery pack is used for identifying a charging state after being awakened and sending a charging request to the charger after the identification is passed; the charger is electrically connected with the commercial power end and is used for charging the battery pack according to the charging request; the slow charging circuit comprises a capacitor, and the slow charging circuit is connected between the charger and the battery pack and is used for charging when the battery pack carries out mains supply charging and discharging under a preset working condition so as to carry out slow charging and charging on the battery pack. According to the scheme, system functions are integrated, only the mains supply needs to be connected, other equipment does not need to be searched additionally, the battery pack can be triggered by the triggering device to supplement electricity under the preset working condition such as power shortage, and safety is good.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a power replenishment system and method for mobile energy storage. Background Art

[0002] As energy storage technology matures, there are more and more application scenarios and methods for energy storage, and mobile storage such as battery packs can be one of the many energy storage solutions. Battery packs are portable and convenient when in use, but because they are not fixed in use, they are also easy to be forgotten, resulting in serious power loss, inability to start, and difficulty in normal power replenishment.

[0003] In view of the above problems, those skilled in the art have been seeking solutions. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a device and method for mobile energy storage in view of the defects of the above-mentioned prior art.

[0005] In order to achieve the above objectives, this application is implemented through the following technical solutions: The present application provides a device for mobile energy storage, including: a trigger device, a charger, and a slow charging circuit; The trigger device is electrically connected to the mains terminal and the battery pack, and is used to wake up the battery pack when triggered; The battery pack is used to identify the charging state after being awakened, and send a charging request to the charger after the identification is passed; The charger is electrically connected to the mains terminal and is used to provide mains power to the battery pack according to the power supply request; The slow charging circuit includes a capacitor, which is arranged between the charger and the battery pack, and is used to store the current output by the charger when the battery pack is supplemented with AC power and to discharge under preset working conditions to perform slow charging for the battery pack.

[0006] Optionally, the trigger device includes: a trigger button and a switch power supply; the battery pack includes a BMS; The trigger button is connected to the switching power supply and the BMS, and is used to be closed when triggered to connect the circuit including the switching power supply and the BMS; The switching power supply is used to output a wake-up voltage to wake up the BMS after the trigger button is triggered; The BMS is used to identify the charging status of the battery pack, and send a charging request to the charger after the identification is successful.

[0007] Optionally, the battery pack includes a DCDC converter, a protection diode, and a detection point; The positive electrode of the protection diode is connected to the DCDC converter, and the negative electrode of the protection diode is connected to the BMS; The detection point is located between the anode of the protection diode and the DCDC converter.

[0008] Optionally, the battery pack further includes a plurality of battery cells; the BMS is further used to obtain parameters of the battery cells and detection points, and to determine that the battery pack charging status has been identified as passed when the parameters meet preset conditions.

[0009] Optionally, the battery pack further comprises a charging circuit; the charging circuit comprises a main circuit and a pre-charging circuit; The BMS is also used to control the main circuit and / or the pre-charging circuit to close after the self-test is completed so that the charger can output a charging current to the battery cell.

[0010] Optionally, the system also includes an energy management unit; the energy management unit is communicatively connected to the charger and the BMS, and is used to output charging start information to the charger after the battery pack charging status is identified so that the charger can charge the battery pack according to the charging request, and output charging limit information to adjust the current output by the charger.

[0011] The present application also provides a power replenishment method applied to the above system, including: In response to the triggering device being triggered, the battery pack performs a charging state identification; After the battery pack is identified, a request for charging is sent to the charger; The charger provides mains power to the battery pack according to the power supply request; The method further comprises: When the battery pack is supplemented with mains power, the charger charges in a slow charging circuit; Under a preset working condition, the slow charging circuit discharges to slowly charge the battery pack.

[0012] Optionally, in response to the triggering device being triggered, the battery pack performs charging state identification, including: Get the parameters of the battery cell and the test points; Determining whether the parameter meets a preset condition; If the condition is satisfied, it is determined that the battery pack charging status identification has passed.

[0013] Optionally, the parameters include battery cell charge, single cell voltage, and detection point voltage; The preset conditions include: The charge of the battery cell is a preset charge, the voltage of the single battery cell is less than a preset protection voltage, and the voltage at the detection point is not a preset voltage.

[0014] Optionally, the method further comprises: When the battery pack charging state is identified, the energy management unit outputs charging start information to the charger to enable the charger to charge the battery pack according to the charging request, and outputs charging limit information to adjust the current output by the charger.

[0015] The present application provides a method for mobile energy storage, with integrated system functions, which only requires connection to the mains power terminal without the need to find other equipment. A trigger device can be used to trigger the battery pack to replenish power under preset working conditions, such as low power, and has good safety.

[0016] In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specifically cites preferred embodiments and describes them in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a structural diagram of a mobile energy storage device provided in one embodiment of the present application.

[0019] Figure 2 It is a flowchart of a power replenishment method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] Figure 1 This is a schematic diagram of a structure for mobile energy storage provided by an embodiment of the present application. Figure 1 The present application provides a device for mobile energy storage, including: a trigger device 10, a charger 20, an energy management unit 30, and a slow charging circuit 40.

[0022] The trigger device 10 is electrically connected to the mains and the battery pack 50 , the charger 20 is electrically connected to the mains, and the energy management unit 30 is communicatively connected to the charger 20 and the battery pack 50 .

[0023] The triggering device 10 is used to wake up the battery pack 50 when being triggered.

[0024] The battery pack 50 is used to identify the charging state after being awakened, and send a charging request to the charger 20 after the identification is successful.

[0025] The charger 20 is used to recharge the battery pack 50 according to the recharge request. In this embodiment, the charger 20 is an AC-DC converter; in other embodiments, the charger 20 can be a power storage inverter (Power Conversion System, referred to as PCS). The main function of the PCS is to achieve bidirectional conversion of electric energy, which can convert DC power into AC power supply network or load use, and can also convert AC power into DC power and store it in the battery.

[0026] In one embodiment, the trigger device 10 includes: a trigger button and a switch power supply 11 .

[0027] The trigger button specifically includes a charging start button SB3 and a mobile energy storage working button SB2. The charging start button SB3 and the mobile energy storage working button SB2 are interlocking switches. Under the control of the interlocking switch, the battery pack 50 cannot be charged and discharged at the same time. The charging start button SB3 is connected between the switching power supply 11 and the battery pack 50, and the mobile energy storage working button SB2 is connected between the charger 20 and the battery pack 50.

[0028] The switching power supply 11 is also connected to the mains terminal. The switching power supply 11 may be an AC-DC converter for converting the alternating current output from the mains into direct current, and outputting a low-voltage wake-up voltage according to the direct current.

[0029] In this embodiment, after the recharging start button SB3 is triggered, the switching power supply 11 outputs a wake-up voltage to the battery pack 50, which can wake up the BMS 51 in the battery pack 50, so that the BMS 51 can identify the recharging status of the battery pack 50, and after identification, send a recharging request to the charger 20.

[0030] In this embodiment, the battery pack 50 includes a BMS 51 , a plurality of battery cells (not shown), a DCDC converter 52 , a protection diode D, a detection point Q, and a charging circuit 53 .

[0031] The anode of the protection diode D is connected to the DCDC converter 52, and the cathode of the protection diode D is connected to the BMS 51. The detection point Q is located between the anode of the protection diode D and the DCDC converter 52. The input end of the charging circuit 53 is connected to the charger 20.

[0032] One end of the power replenishment start button SB3 is connected to the switching power supply 11 , and the other end is connected between the cathode of the protection diode D and the BMS 51 . The mobile energy storage operation button SB2 is connected between the output end of the charging circuit 53 and the DCDC converter 52 .

[0033] The protection diode D is used to prevent the voltage difference of the power supply from flowing back, and is also used to determine the power replenishment status.

[0034] The power replenishment start button SB3 may be triggered manually by a user, or the emergency processing unit (not shown) in the battery pack 50 may trigger the power replenishment start button SB3 after receiving the mains voltage.

[0035] After the charging start button SB3 is triggered, the BMS 51 will also identify the charging status of the battery pack 50 to determine whether the battery pack 50 needs to be charged. Specifically, the BMS 51 obtains the parameters of the battery cell and the detection point and determines whether the parameters meet the preset conditions to identify the charging status of the battery pack 50.

[0036] Among them, the parameters include battery cell charge, single cell voltage, and detection point voltage.

[0037] The preset conditions are: the battery cell charge is the preset charge, the single cell voltage is less than the preset protection voltage, and the detection point voltage is not the preset voltage. In this embodiment, the preset charge is SOC=0%, the preset protection voltage is the third-level protection value set by BMS 51, and the preset voltage is 12V; when BMS 51 determines that the parameters meet the following conditions at the same time: 1. The battery cell SOC=0%; 2. The single cell minimum voltage of the battery cell ≤ the third-level protection value set by BMS 51; 3. If the 12V voltage is not detected at the detection point Q, it can be determined that the energy storage device needs to be recharged. At this time, BMS 51 performs self-test, and during the self-test, the single cell voltage, total pressure, and pressure difference of the battery pack 50 are no longer tested or the detection threshold is amplified.

[0038] The charging circuit 53 includes a main circuit and a pre-charging circuit. The main circuit includes a first switch K1, and the pre-charging circuit includes a second switch K2 and a resistor R. The BMS 51 is also used to control the main circuit and / or the pre-charging circuit to be closed after the self-test is completed so that the charger 20 outputs a charging current to the battery cell. Specifically, after the self-test is completed, the BMS 51 performs a startup operation: insulation detection, closing the pre-charging circuit, closing the main circuit, and disconnecting the pre-charging circuit. Then, the battery pack 50 is connected to the charger 20 and starts to charge the battery pack 50.

[0039] The energy management unit 30 is connected to the charger 20 and the BMS 51 in communication, and is used to output charging start information to the charger 20 after the battery pack 50 charging state is identified, so that the charger 20 can charge the battery pack 50 according to the charging request, and output charging limit information to adjust the current output by the charger 20. Specifically, the energy management unit 30 sends a start command to the charger 20, and the charger 20 charges the battery pack 50 by reading the voltage and current of the battery pack 50; in this process, since the battery cell is seriously depleted, the energy management unit 30 or the BMS 51 performs current limiting charging control on the current output by the charger 20 to avoid excessive charging current causing heating of the battery cell or greater voltage difference. When the battery pack 50 meets the charging stop conditions, such as the battery voltage reaches the cut-off voltage, the battery charge reaches the cut-off SOC, or the user turns off the charging button, the charging work stops.

[0040] Optionally, the slow charging circuit 40 includes a capacitor, and the slow charging circuit 40 is connected between the charger 20 and the battery pack 50, and is used to charge the battery pack 50 when it is supplemented with AC power and to discharge it under preset working conditions to perform slow charging for the battery pack 50.

[0041] In one embodiment, the slow charging circuit 40 may include at least two capacitors in parallel, a capacitor switch connected in series with the capacitor, and a capacitor management system (not shown in the figure). At least two capacitors in parallel can constitute a large-capacitance capacitor. When the battery is supplemented with AC power, the charger 20 outputs current, and the slow charging circuit 40 also starts charging. At this time, at least two capacitors in parallel store charge; when the charger 20 stops supplementing the battery pack 50, it also stops charging the slow charging circuit 40. When the vehicle is in a preset working condition, the vehicle controller sends power consumption information to the capacitor management system, and the capacitor management system controls the on and off of at least one capacitor switch and then controls at least one capacitor to discharge to the battery pack 50.

[0042] The preset working conditions described in this embodiment can be: when the charging start button SB3 is damaged, the BMS 51 cannot be awakened by the switch power supply 11, the battery cell is seriously depleted, the mains power cannot be received temporarily and the battery is in a depleted state, and the connected mains power is peak-valley power. Based on the above preset working conditions, the slow charging circuit 40 of this embodiment can control the capacitor to discharge to the BMS 51 to wake up the BMS 51 when the charging start button SB3 is damaged and the BMS 51 cannot be awakened by the switch power supply 11; or, when the battery cell is seriously depleted, control the capacitor to discharge to the cell to pre-charge the battery pack 50 to avoid excessive charging current output by the charger 20 causing abnormality of the cell; or, when the mains power cannot be received temporarily and the battery is in a depleted state, control most or all capacitors to discharge to the battery pack 50 so that the vehicle has a short endurance until the vehicle is connected to a rechargeable mains power; or, when the connected mains power is peak power, due to the high electricity price during peak hours, control most or all capacitors to discharge to the battery pack 50 so that the vehicle has a short endurance to avoid peak hours.

[0043] Figure 2 This is a flow chart of a method for replenishing electricity provided by an embodiment of the present application. Please also refer to Figure 1 and Figure 2 The present application also provides a power replenishment method applied to the above system, including: S1, in response to the triggering device 10 being triggered, the battery pack 50 identifies the charging state; S2, the battery pack 50 sends a request for charging to the charger 20 after passing the recognition; S3, the charger 20 provides the battery pack 50 with mains power according to the power supply request; The method also includes: S4, when the battery pack 50 is supplemented with mains electricity, the charger 20 charges the slow charging circuit 40; S5. Under the preset working condition, the slow charging circuit 40 discharges to slowly charge the battery pack 50.

[0044] Optionally, S1, in response to the triggering device 10 being triggered, the battery pack 50 performs a charging state identification, including: Get the parameters of the battery cell and the test points; Determine whether the parameters meet the preset conditions; If the condition is satisfied, it is determined that the battery pack 50 charging status identification has passed.

[0045] Optionally, the parameters include battery cell charge, single cell voltage, and detection point voltage; The pre-conditions include: The charge of the battery cell is the preset charge, the voltage of the single battery cell is less than the preset protection voltage, and the voltage at the detection point is not the preset voltage.

[0046] In this embodiment, after the recharging start button SB3 is triggered, BMS 51 will also identify the recharging state of the battery pack 50 to determine whether the battery pack 50 needs to be recharged. Specifically, BMS 51 obtains the parameters of the battery cell and the detection point, and determines whether the parameters meet the preset conditions to identify the recharging state of the battery pack 50. The preset conditions are: the battery cell charge is the preset charge, the single cell voltage is less than the preset protection voltage, and the detection point voltage is not the preset voltage. In this embodiment, the preset charge is SOC=0%, the preset protection voltage is the third-level protection value set by BMS 51, and the preset voltage is 12V; when BMS 51 determines that the parameters meet the conditions at the same time: 1. The SOC of the battery cell=0%; 2. The single cell minimum voltage of the battery cell ≤ the third-level protection value set by BMS 51; 3. Failure to detect 12V voltage at the detection point Q, it can be determined that the energy storage device needs to be recharged. At this time, BMS 51 performs self-test, and during the self-test, the single cell voltage, total pressure, and pressure difference of the battery pack 50 are no longer tested or the detection threshold is amplified.

[0047] Optionally, the method further comprises: When the battery pack 50 passes the charging state recognition, the energy management unit 30 outputs charging start information to the charger 20 to enable the charger 20 to charge the battery pack 50 according to the charging request, and outputs charging limit information to adjust the current output by the charger 20.

[0048] The energy management unit 30 sends a start command to the charger 20, and the charger 20 charges the battery pack 50 by reading the voltage and current of the battery pack 50. In this process, since the battery cell is seriously depleted, the energy management unit 30 or the BMS 51 performs current limiting charging control on the current output by the charger 20 to avoid excessive charging current causing heating of the battery cell or greater voltage difference. If the battery pack 50 meets the conditions for stopping the charging, such as the battery voltage reaches the cut-off voltage, the battery charge reaches the cut-off SOC, or the user turns off the charging button, the charging work stops.

[0049] When the vehicle is in the following preset working conditions, the slow charging circuit 40 is controlled to recharge the battery pack 50 according to the specific situation of the vehicle: when the recharging start button SB3 is damaged, the BMS 51 cannot be awakened by the switching power supply 11, the battery cell is seriously low on power, the AC power cannot be received temporarily and the battery is in a low-power state, and the connected AC power is peak-valley power. Based on the above-mentioned preset working conditions, the slow charging circuit 40 of the present embodiment can control the capacitor to discharge to the BMS 51 to wake up the BMS 51 when the charging start button SB3 is damaged and the BMS 51 cannot be woken up by the switching power supply 11; or, when the battery cell is seriously depleted, control the capacitor to discharge to the cell to pre-charge the battery pack 50 to avoid excessive charging current output by the charger 20 causing cell abnormality; or, when the AC power cannot be received temporarily and the battery is in a depleted state, control most or all of the capacitors to discharge to the battery pack 50 to allow the vehicle to have a short endurance until the vehicle is connected to a rechargeable AC power source; or, when the connected AC power is peak power, due to the high electricity price during peak power consumption, control most or all of the capacitors to discharge to the battery pack 50 to allow the vehicle to have a short endurance to avoid peak power consumption.

[0050] The solution of the present application integrates system functions and only needs to be connected to the AC power supply. There is no need to find other equipment. The trigger device is used to trigger the battery pack to replenish power when it is low on power. In addition to replenishing power with the AC power, slow-charging capacitors can also be used to assist in replenishing power, which is beneficial to the vehicle's endurance.

[0051] Obviously, those skilled in the art can make various changes and modifications to the invention without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these changes and variations. The technical features of the above-described embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A power replenishment system for mobile energy storage, characterized in that: include: Trigger device, charger, slow charging circuit; The trigger device is electrically connected to the mains terminal and the battery pack, and is used to wake up the battery pack when triggered, wherein the battery pack is used to identify the charging state after being awakened, and send a charging request to the charger after the identification is successful; The charger is electrically connected to the mains terminal and is used to provide mains power to the battery pack according to the power supply request; The slow charging circuit includes a capacitor, which is connected between the charger and the battery pack and is used to store the current output by the charger when the battery pack is recharged with AC power, and to discharge the current under preset working conditions to slowly charge the battery pack.

2. The system according to claim 1, characterized in that The trigger device includes: a trigger button and a switch power supply; the battery pack includes a BMS; The trigger button is connected to the switching power supply and the BMS, and is used to be closed when triggered to connect the switching power supply and the BMS; The switching power supply is used to output a wake-up voltage to wake up the BMS after the trigger button is triggered; The BMS is used to identify the charging status of the battery pack, and send a charging request to the charger after the identification is successful.

3. The system according to claim 2, characterized in that The battery pack also includes a DCDC converter and a protection diode; An anode of the protection diode is connected to the DCDC converter, and a cathode of the protection diode is connected to the BMS.

4. The system according to claim 3, characterized in that The battery pack also includes multiple battery cells; the BMS is also used to obtain parameters of the battery cells and detection points, and determine that the battery pack charging status identification has passed when the parameters meet preset conditions, wherein the detection point is located between the positive electrode of the protection diode and the DCDC converter.

5. The system according to claim 4, characterized in that The battery pack also includes a charging circuit; the charging circuit includes a main circuit and a pre-charging circuit; The BMS is also used to control the main circuit and / or the pre-charging circuit to close after the self-test is completed so that the charger can output a charging current to the battery cell.

6. The system according to claim 4, characterized in that The system also includes an energy management unit; the energy management unit is communicatively connected to the charger and the BMS, and is used to output charging start information to the charger after the battery pack charging status is identified, so that the charger can charge the battery pack according to the charging request, and output charging limit information to adjust the current output by the charger.

7. A power replenishment method applied to the system according to any one of claims 1 to 6, characterized in that: include: In response to the triggering device being triggered, the battery pack performs a charging state identification; After the battery pack is identified, a request for charging is sent to the charger; The charger provides mains power to the battery pack according to the power supply request; The method further comprises: When the battery pack is supplemented with mains power, the charger charges in a slow charging circuit; Under a preset working condition, the slow charging circuit discharges to slowly charge the battery pack.

8. The method according to claim 7, characterized in that In response to the triggering device being triggered, the battery pack performs charging state identification, including: Get the parameters of the battery cell and the test points; Determining whether the parameter meets a preset condition; If the condition is satisfied, it is determined that the battery pack charging status identification has passed.

9. The method according to claim 8, characterized in that The parameters include the charge of the battery cell, the voltage of the single battery cell, and the voltage of the detection point; The preset conditions include: The charge of the battery cell is a preset charge, the voltage of the single battery cell is less than a preset protection voltage, and the voltage at the detection point is not a preset voltage.

10. The method according to claim 7, characterized in that The method further comprises: When the battery pack charging state is identified, the energy management unit outputs charging start information to the charger to enable the charger to charge the battery pack according to the charging request, and outputs charging limit information to adjust the current output by the charger.

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