Power supply control system and power supply control method

Abstract

The present invention discloses a power supply control system and a power supply control method, which are related to power electronics technology, and in particular to power supply technology for data centers such as cloud technology or cloud fields. The power supply control system includes: a main battery pack, a first switch, a backup battery pack, a second switch and a power supply control module; wherein the main battery pack is connected to the load through the first switch for powering the load; the backup battery pack is connected to the load through the second switch for powering the load; the power supply control module is connected to the first switch and to the second switch, and the power supply control module is used to: after the main power is cut off, control the first switch to close, and the main battery pack supplies power to the load; or, after the main power is cut off and the main battery pack fails, control the second switch to close, and the backup battery pack supplies power to the load, and control the first switch to open, so as to disconnect the main battery pack from the load. According to this solution, the main battery pack that fails can be quickly isolated.

Description

Technical Field

[0001] The present disclosure relates to power electronics technology, and in particular to power supply technology for data centers such as cloud technology or cloud fields, and specifically to a power supply control system and a power supply control method. Background Art

[0002] The data center is the core area of ​​information integration, equipped with loads that carry storage or computing functions. In order to ensure the normal operation of the data center, the data center needs to have sufficient power supply. The uninterruptible power supply equipment of the data center usually adopts the configuration of lead-acid batteries, lithium batteries or other types of batteries, and realizes uninterrupted power supply after the mains power is cut through the battery pack. Summary of the invention

[0003] The present disclosure provides a power supply control system and a power supply control method.

[0004] According to one aspect of the present disclosure, there is provided a power supply control system, comprising: a main battery pack, a first switch, a backup battery pack, a second switch and a power supply control module;

[0005] The main battery pack is connected to the load through the first switch to supply power to the load; the backup battery pack is connected to the load through the second switch to supply power to the load;

[0006] The power supply control module is connected to the first switch and the second switch, and is used to: after the main power is cut off, control the first switch to close, so that the main battery pack can supply power to the load; or, after the main power is cut off and the main battery pack fails, control the second switch to close, so that the backup battery pack can supply power to the load, and control the first switch to open to disconnect the main battery pack from the load.

[0007] According to another aspect of the present disclosure, a power supply control method is provided, which is performed by the power supply control system as described above, and the method includes:

[0008] After the mains power is cut off, controlling the first switch to close, so that the main battery pack supplies power to the load;

[0009] Determining whether the main battery pack fails;

[0010] When the main battery pack fails, the second switch is controlled to close, so that the backup battery pack supplies power to the load, and the first switch is controlled to open to disconnect the main battery pack from the load.

[0011] The technology disclosed in the present invention solves the problem that the battery pack that currently powers the load cannot be quickly isolated when a fault occurs. With the help of the setting of the first switch and the second switch, automatic switching between the main battery pack and the backup battery pack can be achieved, thereby achieving rapid isolation of the main battery pack that has a fault.

[0012] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure.

[0014] Figure 1 is a schematic diagram of the structure of a power supply control system in an embodiment of the present disclosure;

[0015] Figure 2 is a schematic diagram of a shared backup battery pack solution in an embodiment of the present disclosure;

[0016] Figure 3 is a schematic diagram of a power supply control system in a specific embodiment of the present disclosure;

[0017] Figure 4 is a schematic diagram of a backup battery pack configuration solution provided in a specific example of the present disclosure;

[0018] Figure 5 is a schematic diagram of a DC cabinet in a specific example of the present disclosure;

[0019] Figure 6 is a schematic diagram of a PLC in a specific example of the present disclosure;

[0020] Figure 7 is a flow chart of a power supply control method in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description. "And / or" in the specification and claims represents at least one of the connected objects.

[0022] See also Figure 1 , Figure 1 is a schematic diagram of a power supply control system provided by an embodiment of the present disclosure, such as Figure 1As shown, the power supply control system 10 includes: a main battery pack 11, a first switch 12, a backup battery pack 13, a second switch 14 and a power supply control module 15.

[0023] The main battery pack 11 is connected to the load F through the first switch 12 to supply power to the load F. The backup battery pack 13 is connected to the load F through the second switch 14 to supply power to the load F. The power supply control module 15 is connected to the first switch 12 and also to the second switch 14. The power supply control module 15 is used to: after the main power is cut off, control the first switch 12 to close, so that the main battery pack 11 supplies power to the load F; or, after the main power is cut off and the main battery pack 11 fails, control the second switch 14 to close, so that the backup battery pack 13 supplies power to the load F, and control the first switch 12 to open, so as to disconnect the main battery pack 11 from the load F.

[0024] Optionally, the load F may be a load in a data center for carrying functions such as storage or computing, but is not limited thereto, and may also be a load that requires uninterrupted power supply in other scenarios, such as a load in a server cluster. The single battery in the main battery pack 11 and / or the backup battery pack 13 may be a lead-acid battery, a lithium battery, or other types of batteries. The first switch 12 may be any one of the following: a circuit breaker, a disconnect switch, etc. The second switch 14 may be any one of the following: a circuit breaker, a disconnect switch, etc.

[0025] Optionally, the power supply control module 15 may be a programmable logic controller (PLC) or a direct digital controller (DDC) or other logic execution devices capable of receiving, sending and judging, which is not limited in this embodiment.

[0026] It is understandable that the above-mentioned main battery pack failure can be manifested as a single battery voltage being too low, a single battery internal resistance being too high, a single battery temperature being too high, and / or the battery pack overall voltage being too low. The prerequisite for controlling the first switch 12 to be closed includes that the main battery pack 11 is normal, that is, the main battery pack 11 supplies power to the load F only when it is normal. The prerequisite for controlling the second switch 14 to be closed includes that the backup battery pack 13 is normal, that is, the backup battery pack 13 supplies power to the load F only when it is normal.

[0027] As an optional implementation, in order to ensure uninterrupted power supply to the data center, the second switch 14 can be controlled to be closed first, and after the backup battery pack 13 supplies power to the load F, the first switch 12 can be controlled to be opened to disconnect the main battery pack 11 from the load F, thereby avoiding the expansion of the fault scope while ensuring uninterrupted power supply to the data center. For example, if a high temperature fire or other fault is not disconnected in time, it is easy to cause a major accident such as a fire.

[0028] The power supply control system 10 in the embodiment of the present disclosure, with the help of the setting of the first switch 12 and the second switch 14, can use the main battery pack 11 to supply power to the load F after the main power is cut off, and when the main battery pack 11 fails after the main power is cut off, the backup battery pack 13 can supply power to the load F, and control the first switch 12 to disconnect to disconnect the main battery pack 11 from the load F. In this way, automatic switching between the main battery pack 11 and the backup battery pack 13 can be achieved, thereby quickly isolating the main battery pack that has failed and avoiding the expansion of the fault range. Furthermore, by configuring the backup battery pack 13 in addition to the main battery pack 11, the availability of the power supply control system 10 can be increased, that is, the backup battery pack 13 can be used to supply power to the load when the main battery pack 11 fails.

[0029] Understandably, if a single load is configured with a main battery pack and a backup battery pack, then in a scenario with multiple loads, multiple backup batteries, i.e., multiple backup battery packs, need to be configured to supply power. The backup battery pack is usually used only when the main battery pack fails, and is not used under normal circumstances. Therefore, configuring multiple backup batteries may cause a waste of resources, and further make the corresponding power supply control system high in investment cost and large in area.

[0030] In order to avoid redundant backup battery packs and save resources, in this embodiment, multiple main battery packs can be selected to share the backup battery pack. The number and scale of backup battery configurations can be independently selected based on actual needs to meet customized needs.

[0031] Optionally, in the embodiment of the present disclosure, if Figure 2 As shown, the main battery pack 11 may include M sub-main battery packs 111, the first switch 12 includes M first sub-switches 121, the second switch 14 includes M second sub-switches 141, and the load F includes M sub-loads F1. M is an integer greater than 1. It can be understood that based on Figure 2 In the content, M is equal to 3, but this embodiment is not limited to this. M can also be equal to other values, such as 5 or 10, etc. The value of M can be selected and set based on user needs.

[0032] Among them, the M sub-main battery packs 111 are connected to the M sub-loads F1 through the M first sub-switches 121, that is, each sub-main battery pack 111 is connected to a sub-load F1 through a first sub-switch 121, and there is a one-to-one correspondence between the three. The backup battery pack 13 is connected to the M sub-loads F1 through the M second sub-switches 141, that is, the backup battery pack 13 is connected to a sub-load F1 through a second sub-switch 141, and there is a one-to-one correspondence between the second sub-switch 141 and the sub-load F1.

[0033] In this way, the M sub-main battery packs can share the backup battery pack, thereby avoiding redundant backup battery packs and saving resources.

[0034] In one embodiment, if Figure 3 As shown, taking the power supply control system with two high-voltage direct currents as an example, when the mains supply is normal, when the incoming switch S and switches Q1 to Q8 are closed, the mains can rectify the AC power into DC power for the load after passing through the rectifier module, and charge the main / backup battery packs. Each high-voltage direct current is configured with a main battery pack, that is, the two high-voltage direct currents are respectively configured with a main battery pack 31-1 and a main battery pack 31-2, and a backup battery pack 32 is configured for the two high-voltage direct currents. When the main battery pack 31-1 fails, the circuit breaker B1 of the backup battery pack 32 can be closed, and the backup battery pack 32 can supply power to the load, and the circuit breaker A1 of the main battery pack 31-1 can be disconnected to isolate the faulty main battery pack 31-1, so as to achieve uninterrupted power supply and avoid the expansion of the fault range. And / or, when the main battery pack 31-2 fails, the circuit breaker B2 of the backup battery pack 32 can be closed, and the backup battery pack 32 can supply power to the load, and the circuit breaker A2 of the main battery pack 31-2 can be disconnected to isolate the faulty main battery pack 31-2 to achieve uninterrupted power supply and avoid expanding the scope of the fault.

[0035] In the embodiment of the present disclosure, when M sub-main battery packs share a backup battery pack, when the city power is cut off, according to the energy supply capacity of the backup battery packs, power can be supplied to all the faulty sub-main battery packs; or when the power supply capacity of the backup battery packs is exceeded, power can be supplied to some of the faulty sub-main battery packs.

[0036] Optionally, the power supply control module 15 in this embodiment is respectively connected to M first sub-switches 121, and is also respectively connected to M second sub-switches 141. The power supply control module 15 can be used to: obtain the status information of the M sub-main battery packs 111, and when N sub-main battery packs 111 among the M sub-main battery packs 111 fail, and the N is less than or equal to the maximum number of power supply loads of the backup battery pack 13 obtained in advance, respectively control the N second sub-switches 141 corresponding to the N sub-loads F1 corresponding to the N sub-main battery packs 111 to close, so that the backup battery pack 13 supplies power to the N sub-loads F1, and respectively control the N first sub-switches 121 corresponding to the N sub-loads F1 to open, so as to disconnect the failed N sub-main batteries 111 from the corresponding sub-loads F1, thereby avoiding the expansion of the fault range. N is an integer greater than 1, and N is less than or equal to M. In this way, it can be ensured that the multiple sub-loads F1 corresponding to the multiple sub-main battery groups 111 that have failed are powered normally, thereby achieving uninterrupted power supply.

[0037] For example, assuming that the maximum number of loads that the backup battery group 13 can supply power to is three, that is, the power supply capacity of the backup battery group 13 can supply power to three sub-loads F1, then after two sub-main battery groups 111 fail, the backup battery group 13 can be used to supply power to the two sub-loads F1 corresponding to the two sub-main battery groups 111.

[0038] Furthermore, the power supply control module 15 in this embodiment is also used for: when the N is greater than the maximum number of power supply loads of the backup battery group 13 obtained in advance, selecting the first sub-load from the N sub-loads F1, and controlling the second sub-switch 141 corresponding to the first sub-load to close, so that the backup battery group 13 supplies power to the first sub-load, and controlling the N first sub-switches 121 corresponding to the N sub-loads F1 to open respectively, so as to disconnect the failed N sub-main battery groups 111 from the corresponding multiple sub-loads F1, thereby avoiding the expansion of the fault scope.

[0039] Among them, the first sub-load may be the sub-load F1 corresponding to at least one of the N sub-main battery groups 111 that fail the earliest. For example, assuming that the maximum number of power supply loads of the backup battery group 13 is three, that is, the power supply capacity of the backup battery group 13 can supply power to three sub-loads F1, then in the case of failure of five sub-main battery groups 111, the backup battery group 13 can be used to supply power to the three sub-loads F1 corresponding to the first three sub-main battery groups 111 that fail in sequence based on the time of the failure. For the sub-loads F1 corresponding to the last two sub-main battery groups 111 that fail, the backup battery group 13 is not put into use, that is, the backup battery group 13 is not used to supply power to these two sub-loads F1. In this way, the sub-loads F1 corresponding to the sub-main battery groups 111 that fail can be supplied in sequence within the power supply capacity of the backup battery group 13 to ensure uninterrupted power supply.

[0040] Alternatively, the first sub-load mentioned above can be at least one sub-load F1 with the highest power supply priority among the N sub-loads F1 corresponding to the N sub-main battery packs 111 that have failed. For example, assuming that the maximum number of power supply loads of the backup battery pack 13 is three, that is, the power supply capacity of the backup battery pack 13 can supply power to three sub-loads F1, then in the case of failure of five sub-main battery packs 111, the three sub-loads F1 with the highest power supply priority can be selected based on the power supply priorities of the five sub-loads F1 corresponding to the five sub-main battery packs 111, and the backup battery pack 13 can be used to supply power to the three sub-loads F1 with the highest power supply priority. For the other two sub-loads F1, the backup battery pack 13 is not put into use, that is, the backup battery pack 13 is not used to power the two sub-loads F1. In this way, within the power supply capacity of the backup battery pack 13, priority can be given to powering the sub-loads F1 with higher priority, thereby achieving priority to ensure uninterrupted power supply to important sub-loads F1.

[0041] In the embodiment of the present disclosure, in order to confirm whether the main battery pack fails, the power supply control system 10 may further include a collection module, which is connected to the M sub-main battery packs 111 and also connected to the power supply control module 15. The collection module is used to collect status information of the M sub-main battery packs 111 and transmit the status information to the power supply control module 15.

[0042] It is understandable that, in the case where the main battery group 11 includes M sub-main battery groups 111, the above-mentioned acquisition module needs to collect the status information of each sub-main battery group 111 respectively, so that the power supply control module 15 can determine the sub-main battery group 111 that has a fault among the M sub-main battery groups 111, and control the backup battery group 13 to supply power to the sub-load F1 corresponding to the sub-main battery group 111 that has a fault.

[0043] Optionally, the collected status information may include at least one of the following: single-cell battery voltage, single-cell battery internal resistance, single-cell battery temperature, and battery pack voltage.

[0044] Further, the power supply control module 15 is further configured to: determine that a corresponding sub-main battery pack 111 fails when each sub-main battery pack 111 of the N sub-main battery packs 111 satisfies any of the following conditions:

[0045] The voltage of a single battery is lower than a first threshold;

[0046] The internal resistance of a single battery is higher than a second threshold;

[0047] The temperature of a single battery cell is higher than the third threshold;

[0048] The battery pack voltage is lower than a fourth threshold.

[0049] Among them, the above-mentioned first threshold, second threshold, third threshold and fourth threshold can be pre-set based on actual needs, so that when the voltage of a single battery is too low, the internal resistance of a single battery is too high, the temperature of a single battery is too high or the battery pack voltage is too low, the corresponding sub-main battery pack 111 is switched and powered by the backup battery pack 13.

[0050] Optionally, the backup battery pack configuration scheme provided in the specific example of the present disclosure can be as follows: Figure 4 As shown. Among them, the main battery pack 11 and the backup battery pack 13 are respectively connected to the main disconnect switch (i.e. the above-mentioned first switch 12) and the backup disconnect switch (i.e. the above-mentioned second switch 14) in the battery switch cabinet 40, and the outputs of the main disconnect switch and the backup disconnect switch are connected in parallel to power the load F, and at the same time, the status information of the main disconnect switch and the backup disconnect switch, i.e. the closed / open status information, is transmitted to the PLC 15 (i.e. the above-mentioned power supply control module 15). Battery monitoring can obtain the voltage, internal resistance, temperature, etc. of a single battery in the main / backup battery pack through the acquisition module, as well as the voltage and current of the entire battery pack, and transmit the obtained information to the PLC 15. The PLC 15 can send the closed / open control signal to the main / backup disconnect switch based on the received information such as the main disconnect switch status, the backup disconnect switch status, the main battery pack status, and the backup battery pack status. At the same time, the above-mentioned information and signals can be uploaded to the monitoring host 41 for real-time display and alarm.

[0051] In the specific example of the present disclosure, the main / backup battery pack and the sectionalizer can be connected through a DC cabinet, that is, the DC cabinet is used as a connecting device between the main / backup battery pack and the sectionalizer. Figure 5As shown, it is a schematic diagram of a DC cabinet in a specific example of the present disclosure. The DC cabinet may include two incoming lines L and a signal line S, the two incoming lines L are respectively connected to the main battery pack and the backup battery pack, and the signal line S is used to access the signal for controlling the main / backup disconnect switch. In addition, the DC cabinet can also be selected as other equipment such as high-voltage DC and UPS.

[0052] like Figure 6 As shown, it is a schematic diagram of the PLC in a specific example of the present disclosure. The PLC is a logic judgment module and may include a signal receiving and sending terminal T, a communication interface D, etc. Further, the optional conditions for the PLC to control the disconnection of the main disconnect switch may be: the temperature of a single battery in the main battery pack is too high, the internal resistance is too high, or the voltage is too low, or the voltage of the entire main battery pack is too low. The optional conditions for the PLC to control the opening and closing of the standby disconnect switch may be: the main battery pack battery fails, the standby battery pack batteries are all normal, and the power supply capacity of the standby battery pack is exceeded.

[0053] In addition, the present disclosure also provides a power supply control method executed by the above power supply control system, such as Figure 7 As shown, Figure 7 is a flow chart of a power supply control method provided by an embodiment of the present disclosure, the method comprising:

[0054] Step 71: After the city power is cut off, controlling the first switch to close, so that the main battery pack supplies power to the load;

[0055] Step 72: Determine whether the main battery pack fails;

[0056] Step 73: When the main battery pack fails, the second switch is controlled to be closed, the backup battery pack supplies power to the load, and the first switch is controlled to be opened.

[0057] The power supply control method provided by the embodiment of the present disclosure can realize automatic switching between the main battery pack and the backup battery pack, thereby realizing rapid isolation of the main battery pack that has a fault, and avoiding the expansion of the fault range. Furthermore, by configuring a backup battery pack in addition to the main battery pack, the availability of the power supply control system can be increased, that is, the backup battery pack can be used to power the load when the main battery pack fails.

[0058] Optionally, the main battery pack includes M sub-main battery packs, the first switch includes M first sub-switches, the second switch includes M second sub-switches, and the load includes M sub-loads; M is an integer greater than 1; the M sub-main battery packs are respectively connected to the M sub-loads through the M first sub-switches, and the backup battery packs are respectively connected to the M sub-loads through the M second sub-switches;

[0059] The step 72 may include:

[0060] Acquire status information of the M sub-main battery packs, and determine whether the M sub-main battery packs fail according to the status information;

[0061] The step 73 may include:

[0062] When the status information indicates that N sub-main battery packs among the M sub-main battery packs are faulty, and N is less than or equal to the maximum number of power supply loads of the backup battery pack obtained in advance, the N second sub-switches corresponding to the N sub-loads corresponding to the N sub-main battery packs are respectively controlled to be closed, and the backup battery pack supplies power to the N sub-loads, and the N first sub-switches corresponding to the N sub-loads are respectively controlled to be opened; N is an integer greater than 1, and N is less than or equal to M.

[0063] Furthermore, the step 73 may also include:

[0064] When N is greater than the maximum number of loads powered by the backup battery pack obtained in advance, a first sub-load is selected from the N sub-loads, and a second sub-switch corresponding to the first sub-load is controlled to be closed, the backup battery pack supplies power to the first sub-load, and the N first sub-switches corresponding to the N sub-loads are respectively controlled to be opened;

[0065] The first sub-load is a sub-load corresponding to at least one sub-main battery pack that fails earliest among the N sub-main battery packs, or the first sub-load is at least one sub-load with the highest power supply priority among the N sub-loads.

[0066] Optionally, the status information includes at least one of the following: single-cell battery voltage, single-cell battery internal resistance, single-cell battery temperature, and battery pack voltage.

[0067] Furthermore, the power supply control method further includes:

[0068] When each of the N sub-main battery packs meets any one of the following conditions, it is determined that each sub-main battery pack fails:

[0069] The voltage of a single battery is lower than a first threshold;

[0070] The internal resistance of a single battery is higher than a second threshold;

[0071] The temperature of a single battery cell is higher than the third threshold;

[0072] The battery pack voltage is lower than a fourth threshold.

[0073] Among them, the above-mentioned first threshold, second threshold, third threshold and fourth threshold can be pre-set based on actual needs, so that when the voltage of a single battery is too low, the internal resistance of a single battery is too high, the temperature of a single battery is too high or the battery pack voltage is too low, the corresponding sub-main battery pack is switched and the backup battery pack supplies power to the load.

[0074] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A power supply control system, comprising: A main battery pack, a first switch, a backup battery pack, a second switch and a power supply control module; The main battery pack is connected to the load through the first switch to supply power to the load; the backup battery pack is connected to the load through the second switch to supply power to the load; The power supply control module is connected to the first switch and the second switch, and is used to: after the mains power is cut off, control the first switch to close, so that the main battery pack supplies power to the load; or, after the mains power is cut off and the main battery pack fails, control the second switch to close, so that the backup battery pack supplies power to the load, and control the first switch to open; The main battery pack includes M sub-main battery packs, the first switch includes M first sub-switches, the second switch includes M second sub-switches, and the load includes M sub-loads; M is an integer greater than 1; The M sub-main battery packs are connected to the M sub-loads through the M first sub-switches respectively, and the backup battery packs are connected to the M sub-loads through the M second sub-switches respectively; The power supply control module is respectively connected to the M first sub-switches, and is respectively connected to the M second sub-switches. The power supply control module is specifically used to: obtain status information of the M sub-main battery packs, and when the status information indicates that N sub-main battery packs among the M sub-main battery packs are faulty, and N is less than or equal to the maximum number of power supply loads of the backup battery pack obtained in advance, respectively control the N second sub-switches corresponding to the N sub-loads corresponding to the N sub-main battery packs to be closed, so that the backup battery pack supplies power to the N sub-loads, and respectively control the N first sub-switches corresponding to the N sub-loads to be opened; N is an integer greater than 1, and N is less than or equal to M.

2. The system according to claim 1, wherein: The power supply control module is further specifically configured to: when N is greater than the maximum number of loads powered by the backup battery pack obtained in advance, select a first sub-load from the N sub-loads, control the second sub-switch corresponding to the first sub-load to close, so that the backup battery pack supplies power to the first sub-load, and respectively control the N first sub-switches corresponding to the N sub-loads to open; The first sub-load is a sub-load corresponding to at least one sub-main battery pack that fails earliest among the N sub-main battery packs, or the first sub-load is at least one sub-load with the highest power supply priority among the N sub-loads.

3. The system according to claim 1, further comprising: Acquisition module; The acquisition module is connected to the M sub-main battery packs and the power supply control module; the acquisition module is used to: acquire status information of the M sub-main battery packs and transmit the status information to the power supply control module.

4. The system according to claim 3, wherein: The state information includes at least one of the following: single-cell battery voltage, single-cell battery internal resistance, single-cell battery temperature, and battery pack voltage; The power supply control module is further used to determine that each of the N sub-main battery packs fails when each of the N sub-main battery packs meets any of the following conditions: The voltage of a single battery is lower than a first threshold; The internal resistance of a single battery is higher than a second threshold; The temperature of a single battery cell is higher than the third threshold; The battery pack voltage is lower than a fourth threshold.

5. A power supply control method, executed by the power supply control system according to any one of claims 1 to 4, comprising: After the mains power is cut off, controlling the first switch to close, so that the main battery pack supplies power to the load; Determining whether the main battery pack fails; When the main battery pack fails, the second switch is controlled to be closed, the backup battery pack supplies power to the load, and the first switch is controlled to be opened; The main battery pack includes M sub-main battery packs, the first switch includes M first sub-switches, the second switch includes M second sub-switches, and the load includes M sub-loads; M is an integer greater than 1; the M sub-main battery packs are respectively connected to the M sub-loads through the M first sub-switches, and the backup battery packs are respectively connected to the M sub-loads through the M second sub-switches; Wherein, the determining whether the main battery pack fails includes: Acquire status information of the M sub-main battery packs, and determine whether the M sub-main battery packs fail according to the status information; Wherein, when the main battery pack fails, controlling the second switch to close, so that the backup battery pack supplies power to the load, and controlling the first switch to open, comprises: When the status information indicates that N sub-main battery packs among the M sub-main battery packs are faulty, and N is less than or equal to the maximum number of power supply loads of the backup battery pack obtained in advance, the N second sub-switches corresponding to the N sub-loads corresponding to the N sub-main battery packs are respectively controlled to be closed, and the backup battery pack supplies power to the N sub-loads, and the N first sub-switches corresponding to the N sub-loads are respectively controlled to be opened; N is an integer greater than 1, and N is less than or equal to M.

6. The method according to claim 5, wherein: When the main battery pack fails, the second switch is controlled to be closed, the backup battery pack supplies power to the load, and the first switch is controlled to be disconnected, further comprising: When N is greater than the maximum number of loads powered by the backup battery pack obtained in advance, a first sub-load is selected from the N sub-loads, and a second sub-switch corresponding to the first sub-load is controlled to be closed, the backup battery pack supplies power to the first sub-load, and the N first sub-switches corresponding to the N sub-loads are respectively controlled to be opened; The first sub-load is a sub-load corresponding to at least one sub-main battery pack that fails earliest among the N sub-main battery packs, or the first sub-load is at least one sub-load with the highest power supply priority among the N sub-loads.

7. The method according to claim 5, wherein: The state information includes at least one of the following: single-cell battery voltage, single-cell battery internal resistance, single-cell battery temperature, and battery pack voltage; The method further comprises: When each of the N sub-main battery packs meets any one of the following conditions, it is determined that each sub-main battery pack fails: The voltage of a single battery is lower than a first threshold; The internal resistance of a single battery is higher than a second threshold; The temperature of a single battery cell is higher than the third threshold; The battery pack voltage is lower than a fourth threshold.

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