Battery charging method and system

Abstract

The invention provides a battery charging method and system, and relates to the technical field of batteries, and the battery charging system comprises an energy storage converter, a high-voltage control box and a battery module. The high-voltage control box comprises a first switching circuit; the energy storage converter is connected with the battery module through the first switching circuit; the energy storage converter is used for controlling the first switching circuit to be switched on under the condition that the battery module is in a power shortage state so as to charge the battery module through a power supply; and the power supply is connected with the energy storage converter. According to the invention, under the condition that the battery module is in the power-lacking state, the battery module is forcibly charged directly through the energy storage converter, an external charger is not needed, and the battery module does not need to be disassembled, so that the charging safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery charging method and system. Background Art

[0002] Household energy storage systems usually consist of battery systems, power conversion systems (PCS), photovoltaic panels and household loads. The battery system consists of batteries, battery management systems (BMS) and protection circuits. BMS has functions such as data acquisition, protection control and upward communication of the battery system, and is an important control part of the battery system. Batteries are usually connected to the battery management system BMS through a DC-DC converter. The DC-DC (Direct Current-Direct Current) converter converts the voltage output by the battery into the power supply voltage of the BMS to power the BMS. However, when the battery voltage is lower than the input voltage of the DC-DC converter, the DC-DC converter and the BMS are both disconnected due to insufficient power supply. In this way, the BMS cannot control the charging and discharging process of the battery, which causes the energy storage system to malfunction.

[0003] In the related art, when the battery voltage is lower than the input voltage of the DC-DC converter, the battery is usually charged by an external charging device.

[0004] However, in the above-mentioned related technologies, professionals are required to disassemble the battery and plug the charging device into the terminal inside the battery to achieve charging, while the batteries of household energy storage systems are usually high-voltage batteries, which leads to poor charging safety. Summary of the invention

[0005] In view of the problems existing in the prior art, an embodiment of the present invention provides a battery charging method and system.

[0006] The present invention provides a battery charging system, comprising an energy storage converter, a high-voltage control box and a battery module; the high-voltage control box comprises a first switch circuit; the energy storage converter is connected to the battery module via the first switch circuit;

[0007] The energy storage converter is used to control the first switch circuit to conduct when the battery module is in a power-deficient state, so as to charge the battery module through a power supply; the power supply is connected to the energy storage converter.

[0008] According to a battery charging system provided by the present invention, the high-voltage control box further includes a battery management system and a voltage conversion circuit; the battery management system is connected to the energy storage converter, and the battery management system is connected to the battery module through the voltage conversion circuit;

[0009] The energy storage converter is further configured to send a data request message to the battery management system, and control the first switch circuit to be turned on within a second preset time period if no data response message sent by the battery management system is received within a first preset time period, and detect the current voltage of the battery module when the first switch circuit is in the on state;

[0010] The energy storage converter is further used to determine that the battery module is in a power-deficient state when the current voltage of the battery module is less than the input voltage of the voltage conversion circuit.

[0011] According to a battery charging system provided by the present invention, the high-voltage control box further includes a second switch circuit, and the second switch circuit is respectively connected to the battery management system, the energy storage converter and the battery module;

[0012] The battery management system is used to control the second switch circuit to be turned on when the battery module is in a non-depleted state;

[0013] The energy storage converter is also used to charge the battery module through the power supply when the second switch circuit is turned on.

[0014] According to a battery charging system provided by the present invention, the energy storage inverter is specifically used to control the voltage input to the battery module to be greater than the input voltage of the voltage conversion circuit, and to control the current input to the battery module to be less than or equal to the rated current of the battery module, and the difference between the rated current of the battery module and the current input to the battery module is less than a preset value.

[0015] According to a battery charging system provided by the present invention, the energy storage inverter is also used to send first control information to the battery management system based on a preset period during the process of charging the battery module through the power supply when the first switching circuit is turned on, until the charging success information sent by the battery management system is received, and then stop sending the first control information to the battery management system; the first control information is used to indicate that the battery management system is prohibited from turning on the second switching circuit; the charging success information is sent by the battery management system when it is determined that the current voltage of the battery module is greater than or equal to the input voltage of the voltage conversion circuit.

[0016] According to a battery charging system provided by the present invention, the energy storage inverter is also used to control the first switch circuit to disconnect and send second control information to the battery management system when receiving the charging success information sent by the battery management system; the second control information is used to indicate that the battery management system is allowed to turn on the second switch circuit.

[0017] The present invention further provides a battery charging method, which is applied to the energy storage converter in the battery charging system described in any of the above embodiments; the method comprises:

[0018] When it is determined that the battery module is in a power-deficient state, the first switch circuit is controlled to be turned on so as to charge the battery module through the power supply.

[0019] The present invention also provides an energy storage converter, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, any of the above-mentioned battery charging methods is implemented.

[0020] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the battery charging method described in any one of the above is implemented.

[0021] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the battery charging method described above is implemented.

[0022] The present invention provides a battery charging method and system, the battery charging system includes an energy storage converter, a high-voltage control box and a battery module, the high-voltage control box includes a first switch circuit, and the energy storage converter controls the first switch circuit to be turned on when the battery module is in a power-deficient state, so that the power supply is connected to the battery module through the energy storage converter, thereby charging the battery module. It can be seen that the present invention directly forces the battery module to be charged through the energy storage converter when the battery module is in a power-deficient state, without the need for an external charger, and without the need to disassemble the battery module, thereby improving the safety of charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the topological structure of a household energy storage system in the related art;

[0025] Figure 2 It is one of the structural schematic diagrams of the battery charging system provided by the embodiment of the present invention;

[0026] Figure 3 This is a second structural schematic diagram of a battery charging system provided by an embodiment of the present invention;

[0027] Figure 4 This is a third structural diagram of a battery charging system provided by an embodiment of the present invention;

[0028] Figure 5 This is one of the flowcharts of the battery charging method provided by an embodiment of the present invention;

[0029] Figure 6 This is a second flow chart of a battery charging method provided by an embodiment of the present invention;

[0030] Figure 7 This is a third flow chart of a battery charging method provided by an embodiment of the present invention;

[0031] Figure 8 This is a fourth flow chart of the battery charging method provided by an embodiment of the present invention;

[0032] Fig. 9 is a schematic structural diagram of a battery charging device provided by an embodiment of the present invention;

[0033] Fig.10 It is a schematic diagram of the physical structure of the energy storage converter provided by the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0035] Typical household energy storage system topology is as follows: Figure 1As shown, it includes a high-voltage control box and one or more battery packs. Among them, the high-voltage control box includes a BMS, a DC-DC converter, a main positive relay and a main negative relay. The main function of the BMS is to collect the status information of each battery pack and control the on and off of the main positive relay or the main negative relay based on the status information of each battery pack. The power supply source of the BMS is the 12V or 24V voltage converted by the battery pack through the DC-DC converter. The input voltage range of the DC-DC converter is generally a wide voltage of more than one hundred to several hundred volts. Such an architecture will bring a problem. The DC-DC converter and the BMS always need to be powered by the battery pack. When the battery pack itself has little power and is always in a static or non-charging state, the battery pack voltage will slowly decrease until it is lower than the lower limit of the input voltage of the DC-DC converter. At this time, the DC-DC converter and the BMS are in a power-off state, the main positive relay and the main negative relay are in a disconnected state, and the battery pack cannot be charged through the PCS. It can only be started when the battery pack voltage is raised to above the lower limit of the input voltage of the DC-DC converter through an external adapter or power supply, and the main positive relay or the main negative relay is controlled to close, and the system returns to normal.

[0036] However, when charging the battery via an external adapter or power supply, professionals are required to disassemble the battery and plug the external adapter or power supply into the terminals inside the battery to achieve charging. The batteries in household energy storage systems are usually high-voltage batteries, which results in poor charging safety.

[0037] In view of this, the present invention proposes a battery charging system, which includes an energy storage inverter, a high-voltage control box and a battery module. The high-voltage control box includes a first switch circuit. When the battery module is in a power-deficient state, the energy storage inverter controls the first switch circuit to be turned on, so that the power supply is connected to the battery module through the energy storage inverter, thereby charging the battery module. It can be seen that when the battery module is in a power-deficient state, the present invention directly forces the battery module to be charged through the energy storage inverter, without the need for an external charger, and without the need to disassemble the battery module, thereby improving the safety of charging.

[0038] Combine the following Figure 2-Figure 4 A battery charging system of the present invention is described.

[0039] Figure 2 FIG. 1 is one of the structural diagrams of the battery charging system provided by an embodiment of the present invention. Figure 2 As shown, the battery charging system includes an energy storage inverter 201, a high-voltage control box 202 and a battery module 203; the high-voltage control box 202 includes a first switch circuit 2021; the energy storage inverter 201 is connected to the battery module 203 through the first switch circuit 2021.

[0040] The energy storage converter 201 is used to control the first switch circuit 2021 to conduct when the battery module 203 is in a power-deficient state, so as to charge the battery module 203 through a power supply; the power supply is connected to the energy storage converter 201.

[0041] Among them, the household energy storage system mainly stores the excess electricity generated by the solar panels in the battery module 203, so that the family can use it at any time. When the sunlight is normal during the day, the solar panels generate more energy, and the battery module 203 can store it to ensure electricity at night or on rainy days. At the same time, if there is a sudden suspension of household electricity, such as computer drawings cannot be saved in time, the fresh food in the refrigerator melts and may deteriorate, etc., the household energy storage system can maintain the continuity of electricity in this case.

[0042] The energy storage inverter 201 is a device connected between the battery system and the power grid, or between the battery system and the solar panel to realize bidirectional conversion of electric energy. It can control the charging and discharging process of the battery, perform AC / DC conversion, and directly supply power to AC loads without a power grid.

[0043] The first switch circuit 2021 may include a first positive relay and a first negative relay, such as Figure 2 As shown, the first end of the first positive relay is connected to the positive terminal of the battery of the energy storage inverter 201, the second end of the first positive relay is connected to the positive electrode of the battery module 203, the control end of the first positive relay is connected to the energy storage inverter 201, the first end of the first negative relay is connected to the negative terminal of the battery of the energy storage inverter 201, the second end of the first negative relay is connected to the negative electrode of the battery module 203, and the control end of the first negative relay is connected to the energy storage inverter 201.

[0044] For example, from Figure 1 It can be seen that the battery module 203 needs to power the BMS through the DC-DC converter, and can also power other loads. When the battery module 203 itself has less power, or is always in a static or non-charging state, the voltage of the battery module 203 will slowly decrease until it is lower than the lower limit of the input voltage of the DC-DC converter. In this case, the battery module 203 is considered to be in a power-deficient state. When the battery module 203 is in a power-deficient state, the energy storage converter 201 controls the first switch circuit 2021 to be turned on, so that the power supply is connected to the battery module 203 after passing through the energy storage converter 201 and the first switch circuit 2021 in turn, and the battery module 203 is forced to charge, so that the voltage of the battery module 203 is higher than the lower limit of the input voltage of the DC-DC converter, and then the DC-DC converter is used to normally power the BMS to ensure the normal operation of the entire system. Among them, the power supply can be a solar panel or a power grid.

[0045] The battery charging system provided by the present invention includes an energy storage inverter, a high-voltage control box and a battery module. The high-voltage control box includes a first switch circuit. When the battery module is in a power-deficient state, the energy storage inverter controls the first switch circuit to be turned on, so that the power supply is connected to the battery module through the energy storage inverter, thereby charging the battery module. It can be seen that when the battery module is in a power-deficient state, the present invention directly forces the battery module to be charged through the energy storage inverter, without the need for an external charger, and without the need to disassemble the battery module, thereby improving the safety of charging.

[0046] In one embodiment, Figure 3 FIG. 2 is a second structural diagram of a battery charging system provided by an embodiment of the present invention. Figure 3 As shown, the high-voltage control box 202 also includes a battery management system 2022 and a voltage conversion circuit 2023; the battery management system 2022 is connected to the energy storage inverter 201, and the battery management system 2022 is connected to the battery module 203 through the voltage conversion circuit 2023.

[0047] The energy storage inverter 201 is also used to send a data request message to the battery management system 2022, and when no data response message sent by the battery management system 2022 is received within a first preset time period, control the first switch circuit 2021 to be turned on within a second preset time period, and detect the current voltage of the battery module 203 when the first switch circuit 2021 is in the on state.

[0048] The energy storage converter 201 is further used to determine that the battery module 203 is in a power-deficient state when the current voltage of the battery module 203 is less than the input voltage of the voltage conversion circuit 2023 .

[0049] The voltage conversion circuit 2023 may be a DC-DC converter.

[0050] Among them, the first preset time length and the second preset time length can be set based on demand. The second preset time length can be considered as the time when the energy storage inverter 201 can detect the current voltage of the battery module 203, that is, the energy storage inverter 201 controls the first switch circuit 2021 to be turned on, and after the energy storage inverter 201 detects the current voltage of the battery module 203, it controls the first switch circuit 2021 to be turned off.

[0051] For example, generally speaking, when the battery module 203 is left idle for a long time, if it is found that the battery module 203 cannot be charged or discharged normally, it means that the battery module 203 may be in a low-power state; or, when the current power of the battery module 203 cannot supply power to the BMS, it also means that the battery module 203 is in a low-power state. The present invention can start the battery low-power detection function of the PCS through the interaction between the energy storage converter 201 PCS and the BMS.

[0052] Specifically, the user can input a battery low power detection instruction on the human-computer interaction interface of the PCS. When the PCS receives the battery low power detection instruction input by the user, it sends a data request message to the BMS. If the BMS is in normal working state, the BMS will return a data response message to the PCS when receiving the data request message sent by the PCS. Therefore, when the PCS does not receive the data response message sent by the BMS within the first preset time period, it is considered that the BMS is in a power-off state, and it is determined that the BMS cannot realize the charging process of the battery module 203 through the PCS; at this time, the energy storage inverter 201 controls the first switch circuit 2021 to be turned on through the dry contact, that is, controls the first positive relay and the first negative relay to be turned on, detects the current voltage of the battery module 203 through the voltage detection circuit inside the energy storage inverter 201, and controls the first switch circuit 2021 to be disconnected when the current voltage of the battery module 203 is detected. When it is determined that the current voltage of the battery module 203 is less than the input voltage of the voltage conversion circuit 2023, it means that the battery module 203 cannot normally supply power to the voltage conversion circuit 2023 at this time, so it is determined that the battery module 203 is in a low-power state and the battery forced charging function needs to be started.

[0053] It should be noted that before controlling the first switch circuit 2021 to be turned on, the energy storage inverter 201 can also control the power circuit inside the energy storage inverter 201 to be disconnected, so as to avoid the problem that after the first switch circuit 2021 is turned on, the power circuit generates a charge and discharge process on the battery module 203, causing the current voltage of the battery module 203 to be inaccurate; after starting the battery forced charging function, the energy storage inverter 201 reopens the internal power circuit. After turning on the internal power circuit, the battery module 203 can be charged through the power supply.

[0054] It should be noted that when the energy storage inverter 201 receives the data response message sent by the battery management system 2022 within the first preset time period, it means that the battery management system 2022 is in normal working state. At this time, there is no need to detect the low-power state of the battery module 203.

[0055] In this embodiment, the interaction between the PCS and the BMS can be used to automatically detect whether the battery module 203 is in a low-power state, thereby improving the accuracy and efficiency of low-power state detection.

[0056] In one embodiment, Figure 4 FIG. 3 is a structural diagram of a battery charging system provided by an embodiment of the present invention. Figure 4 As shown, the high-voltage control box 202 further includes a second switch circuit 2024, and the second switch circuit 2024 is connected to the battery management system 2022, the energy storage inverter 201 and the battery module 203 respectively.

[0057] The battery management system 2022 is used to control the second switch circuit 2024 to be turned on when the battery module 203 is in a non-depleted state and the current voltage of the battery module 203 is less than a preset voltage.

[0058] The energy storage converter 201 is also used to charge the battery module 203 through the power supply when the second switch circuit 2024 is turned on.

[0059] The second switch circuit 2024 includes a second positive relay and a second negative relay. Figure 4 As shown, the first end of the second positive relay is connected to the positive terminal of the battery of the energy storage inverter 201, the second end of the second positive relay is connected to the positive electrode of the battery module 203, the control end of the second positive relay is connected to the battery management system 2022, the first end of the second negative relay is connected to the negative terminal of the battery of the energy storage inverter 201, the second end of the second negative relay is connected to the negative electrode of the battery module 203, and the control end of the second negative relay is connected to the battery management system 2022; the preset voltage can be the rated voltage of the battery module 203, etc.

[0060] For example, when the battery module 203 is in a non-depleted state, that is, when the battery module 203 can supply power to the BMS normally, if the BMS detects that the voltage of the battery module 203 is less than the preset voltage, the second switch circuit 2024 is controlled to be turned on. When the second switch circuit 2024 is turned on, the power supply is connected to the battery module 203 through the energy storage converter 201 and the second switch circuit 2024 in sequence, so that the battery module 203 can be charged. That is to say, when the battery module 203 is in a non-depleted state, the battery module 203 is connected to the PCS through the second positive relay and the second negative relay to form a loop; when the battery module 203 is in a depleted state, the PCS controls the first positive relay and the first negative relay to close, and forces the battery module 203 to be charged. Among them, the second positive relay and the second negative relay are both main relays, and the first positive relay and the first negative relay are both standby relays.

[0061] In this embodiment, when the battery module 203 is in a non-depleted state, the battery module 203 is connected to the PCS through the second positive relay and the second negative relay to form a loop, thereby realizing a normal charging process of the battery module 203 .

[0062] In one embodiment, the energy storage inverter 201 is specifically used to control the voltage input to the battery module 203 to be greater than the input voltage of the voltage conversion circuit 2023, and to control the current input to the battery module 203 to be less than or equal to the rated current of the battery module 203, and the difference between the rated current of the battery module 203 and the current input to the battery module 203 is less than a preset value.

[0063] For example, when the energy storage converter 201 controls the first positive relay and the first negative relay to be turned on through the dry contact, it is necessary to simultaneously control the voltage V input to the battery module 203. p is greater than the input voltage V of the voltage conversion circuit 2023 in , for example, V p For a value higher than V in The voltage of several tens of volts is controlled to be less than or equal to the rated current of the battery module 203. At this time, the voltage V p will be clamped by the battery module 203 to the voltage V b , the PCS charges the battery module 203 through the circuit of the first positive relay and the first negative relay.

[0064] In this embodiment, when charging the battery module 203 through the circuit of the first positive relay and the first negative relay, it is necessary to control the voltage and current input to the battery module 203 to meet certain conditions to ensure reliable charging of the battery module 203.

[0065] In one embodiment, the energy storage inverter 201 is also used to send first control information to the battery management system 2022 based on a preset period during the process of charging the battery module 203 through the power supply when the first switching circuit 2021 is turned on, until the charging success information sent by the battery management system 2022 is received, and then stop sending the first control information to the battery management system 2022; the first control information is used to indicate that the battery management system 2022 is prohibited from turning on the second switching circuit 2024; the charging success information is sent by the battery management system 2022 when it is determined that the current voltage of the battery module 203 is greater than or equal to the input voltage of the voltage conversion circuit 2023.

[0066] For example, when the first switch circuit 2021 is turned on, during the process of charging the battery module 203 through the power supply, the PCS sends the first control information for instructing the BMS to prohibit the BMS from turning on the second switch circuit 2024 based on a preset period, so as to prevent the BMS from performing the turning-on action of the second switch circuit 2024 when it can work normally, causing the first switch circuit 2021 and the second switch circuit 2024 to be turned on at the same time; after a period of charging, if the voltage detection circuit inside the PCS detects that the current voltage of the battery module 203 is greater than or equal to the input voltage of the voltage conversion circuit 2023, the voltage conversion circuit 2023 It can be powered on normally and the BMS starts normally. At this time, the PCS still sends the first control information to the BMS to instruct the BMS to prohibit the BMS from turning on the second switch circuit 2024 until the BMS starts normally. When the BMS detects that the current voltage of the battery module 203 is greater than or equal to the input voltage of the voltage conversion circuit 2023, for example, when the BMS detects that the current voltage of the battery module 203 is greater than 1.2 times the input voltage of the voltage conversion circuit 2023, it sends a charging success message to the PCS. When the PCS receives the charging success message sent by the BMS, it determines that the BMS can work normally, and stops sending the first control information to the BMS.

[0067] It should be noted that, when the PCS sends the first control information to the BMS, it may also send a data request message to the BMS, so as to determine whether the BMS is able to work normally by whether a data response message sent by the BMS is received.

[0068] In this embodiment, when the first switch circuit 2021 is turned on, during the process of charging the battery module 203 through the power supply, the PCS sends the first control information for instructing the BMS to prohibit the BMS from turning on the second switch circuit 2024 based on a preset period, and stops sending the first control information to the BMS when receiving the charging success information sent by the BMS, so as to prevent the BMS from performing the turning-on action on the second switch circuit 2024 when it can work normally, causing the first switch circuit 2021 and the second switch circuit 2024 to be turned on at the same time.

[0069] In one embodiment, the energy storage inverter 201 is also used to control the first switch circuit 2021 to disconnect and send second control information to the battery management system 2022 when receiving the charging success information sent by the battery management system 2022; the second control information is used to indicate that the battery management system 2022 is allowed to turn on the second switch circuit 2024.

[0070] For example, when the PCS receives the charging success information sent by the BMS, it believes that the BMS is able to work normally. At this time, the PCS controls the first positive relay and the first negative relay to be disconnected through the dry contact, and sends the second control information to the BMS to indicate that the BMS is allowed to turn on the second switch circuit 2024, so that the entire battery charging system returns to the normal charging process controlled by the BMS.

[0071] Figure 5 FIG. 1 is one of the flow charts of the battery charging method provided by an embodiment of the present invention. Figure 5 As shown, the energy storage converter used in the battery charging system of any of the above embodiments, the battery charging method comprises the following steps:

[0072] Step 501: When it is determined that the battery module is in a power-deficient state, control the first switch circuit to be turned on to charge the battery module through a power supply.

[0073] In the battery charging method provided by the present invention, when the battery module is in a power-deficient state, the energy storage converter controls the first switch circuit to be turned on, so that the power supply is connected to the battery module through the energy storage converter, thereby charging the battery module. It can be seen that when the battery module is in a power-deficient state, the present invention directly forces the battery module to be charged through the energy storage converter, without the need for an external charger, and without the need to disassemble the battery module, thereby improving the safety of charging.

[0074] In one embodiment, Figure 6 FIG. 2 is a flow chart of a battery charging method according to an embodiment of the present invention. Figure 6 As shown, before the above step 501, the battery charging method further includes the following steps:

[0075] Step 502: Send a data request message to the battery management system, and if no data response message is received from the battery management system within a first preset time period, control the first switch circuit to be turned on within a second preset time period, and detect the current voltage of the battery module when the first switch circuit is in the on state.

[0076] Step 503: When the current voltage of the battery module is less than the input voltage of the voltage conversion circuit, determine that the battery module is in a power-deficient state.

[0077] In one embodiment, the energy storage inverter is specifically used to control the voltage input to the battery module to be greater than the input voltage of the voltage conversion circuit, and to control the current input to the battery module to be less than or equal to the rated current of the battery module, and the difference between the rated current of the battery module and the current input to the battery module is less than a preset value.

[0078] In one embodiment, Figure 7 FIG. 3 is a flow chart of a battery charging method provided by an embodiment of the present invention. Figure 7 As shown, the battery charging method also includes the following steps:

[0079] Step 504: When the first switch circuit is turned on, during the process of charging the battery module through the power supply, first control information is sent to the battery management system based on a preset period until the charging success information sent by the battery management system is received, and then the first control information is stopped from being sent to the battery management system; the first control information is used to indicate that the battery management system is prohibited from turning on the second switch circuit; the charging success information is sent by the battery management system when it is determined that the current voltage of the battery module is greater than or equal to the input voltage of the voltage conversion circuit.

[0080] In one embodiment, Figure 8 FIG. 4 is a flow chart of a battery charging method provided by an embodiment of the present invention. Figure 8 As shown, after step 504, the battery charging method further includes the following steps:

[0081] Step 505: upon receiving the charging success information sent by the battery management system, control the first switch circuit to be disconnected, and send second control information to the battery management system; the second control information is used to indicate that the battery management system is allowed to turn on the second switch circuit.

[0082] The battery charging device provided by the present invention is described below. The battery charging device described below and the battery charging method described above can be referred to each other.

[0083] Fig. 9 is a schematic diagram of the structure of a battery charging device provided by an embodiment of the present invention. Fig. 9 As shown, the battery charging device 900 includes a first control unit 901; wherein:

[0084] The first control unit 901 is used to control the first switch circuit to be turned on when it is determined that the battery module is in a power-deficient state, so as to charge the battery module through the power supply.

[0085] Based on any of the above embodiments, the battery charging device 900 further includes:

[0086] A first sending unit, used to send a data request message to the battery management system;

[0087] A second control unit is used to control the first switch circuit to be turned on within a second preset time period if no data response message sent by the battery management system is received within a first preset time period, and to detect the current voltage of the battery module when the first switch circuit is in the turned-on state;

[0088] The determination unit is used to determine that the battery module is in a power-deficient state when the current voltage of the battery module is less than the input voltage of the voltage conversion circuit.

[0089] Based on any of the foregoing embodiments, the first control unit 901 is specifically configured to:

[0090] The voltage input to the battery module is controlled to be greater than the input voltage of the voltage conversion circuit, and the current input to the battery module is controlled to be less than or equal to the rated current of the battery module, and the difference between the rated current of the battery module and the current input to the battery module is less than a preset value.

[0091] Based on any of the above embodiments, the battery charging device 900 further includes:

[0092] A second sending unit is used to send first control information to the battery management system based on a preset period during the process of charging the battery module through the power supply when the first switch circuit is turned on, until the charging success information sent by the battery management system is received, and then stop sending the first control information to the battery management system; the first control information is used to indicate that the battery management system is prohibited from turning on the second switch circuit; the charging success information is sent by the battery management system when it is determined that the current voltage of the battery module is greater than or equal to the input voltage of the voltage conversion circuit.

[0093] Based on any of the above embodiments, the battery charging device 900 further includes:

[0094] A third control unit is used to control the first switch circuit to disconnect and send second control information to the battery management system when receiving the charging success information sent by the battery management system; the second control information is used to indicate that the battery management system is allowed to turn on the second switch circuit.

[0095] Fig.10 is a schematic diagram of the physical structure of the energy storage converter provided by an embodiment of the present invention, such as Fig.10As shown, the energy storage converter may include: a processor 1010, a communication interface 1020, a memory 1030 and a communication bus 1040, wherein the processor 1010, the communication interface 1020 and the memory 1030 communicate with each other through the communication bus 1040. The processor 1010 may call the logic instructions in the memory 1030 to execute the battery charging method, which includes: when it is determined that the battery module is in a power-deficient state, controlling the first switch circuit to be turned on to charge the battery module through the power supply.

[0096] In addition, the logic instructions in the above-mentioned memory 1030 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk.

[0097] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the battery charging method provided by the above methods. The method includes: when it is determined that the battery module is in a low-power state, controlling the first switch circuit to be turned on to charge the battery module through a power supply.

[0098] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the battery charging method provided by the above-mentioned methods. The method includes: when it is determined that the battery module is in a low-power state, controlling the first switch circuit to be turned on to charge the battery module through a power supply.

[0099] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0100] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery charging system, characterized in that: It includes an energy storage converter, a high-voltage control box and a battery module; the high-voltage control box includes a first switch circuit; the energy storage converter is connected to the battery module through the first switch circuit; The energy storage converter is used to control the first switch circuit to conduct when the battery module is in a power-deficient state, so as to charge the battery module through a power supply; the power supply is connected to the energy storage converter.

2. The battery charging system according to claim 1, characterized in that: The high-voltage control box also includes a battery management system and a voltage conversion circuit; the battery management system is connected to the energy storage converter, and the battery management system is connected to the battery module through the voltage conversion circuit; The energy storage converter is further configured to send a data request message to the battery management system, and control the first switch circuit to be turned on within a second preset time period if no data response message sent by the battery management system is received within a first preset time period, and detect the current voltage of the battery module when the first switch circuit is in the on state; The energy storage converter is further used to determine that the battery module is in a power-deficient state when the current voltage of the battery module is less than the input voltage of the voltage conversion circuit.

3. The battery charging system according to claim 2, characterized in that: The high-voltage control box also includes a second switch circuit, which is connected to the battery management system, the energy storage converter and the battery module respectively; The battery management system is used to control the second switch circuit to be turned on when the battery module is in a non-depleted state; The energy storage converter is also used to charge the battery module through the power supply when the second switch circuit is turned on.

4. The battery charging system according to claim 2, characterized in that: The energy storage inverter is specifically used to control the voltage input to the battery module to be greater than the input voltage of the voltage conversion circuit, and to control the current input to the battery module to be less than or equal to the rated current of the battery module, and the difference between the rated current of the battery module and the current input to the battery module is less than a preset value.

5. The battery charging system according to claim 3, characterized in that: The energy storage converter is further configured to, when the first switch circuit is turned on, send first control information to the battery management system based on a preset period during the process of charging the battery module through the power supply, and stop sending the first control information to the battery management system when receiving charging success information sent by the battery management system; The first control information is used to instruct the battery management system to prohibit turning on the second switch circuit; The charging success information is sent by the battery management system when it is determined that the current voltage of the battery module is greater than or equal to the input voltage of the voltage conversion circuit.

6. The battery charging system according to claim 5, characterized in that: The energy storage converter is further configured to control the first switch circuit to disconnect and send second control information to the battery management system when receiving the charging success information sent by the battery management system; The second control information is used to indicate that the battery management system is allowed to turn on the second switch circuit.

7. A battery charging method, characterized in that: An energy storage converter used in a battery charging system according to any one of claims 1 to 6; the method comprising: When it is determined that the battery module is in a power-deficient state, the first switch circuit is controlled to be turned on so as to charge the battery module through the power supply.

8. The battery charging method according to claim 7, characterized in that: The step of determining that the battery module is in a power-deficient state includes: Sending a data request message to a battery management system, and if no data response message sent by the battery management system is received within a first preset time period, controlling the first switch circuit to be turned on within a second preset time period, and detecting the current voltage of the battery module when the first switch circuit is in the turned-on state; When the current voltage of the battery module is less than the input voltage of the voltage conversion circuit, it is determined that the battery module is in a power-deficient state.

9. The battery charging method according to claim 7, characterized in that: The method further comprises: When the first switch circuit is turned on, during the process of charging the battery module through the power supply, first control information is sent to the battery management system based on a preset period until the charging success information sent by the battery management system is received, and then the first control information is stopped from being sent to the battery management system; the first control information is used to indicate that the battery management system is prohibited from turning on the second switch circuit; the charging success information is sent by the battery management system when it is determined that the current voltage of the battery module is greater than or equal to the input voltage of the voltage conversion circuit.

10. The battery charging method according to claim 9, characterized in that: The method further comprises: When receiving the charging success information sent by the battery management system, the first switch circuit is controlled to be disconnected, and second control information is sent to the battery management system; the second control information is used to indicate that the battery management system is allowed to turn on the second switch circuit.

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