Battery pack, control method of battery pack, and electric energy device

Abstract

The embodiment of the application provides a battery pack, a control method of the battery pack and an electric energy equipment, and relates to the technical field of batteries.The battery pack comprises two battery groups and a control module;the two battery groups are used for connecting the same load;one battery group in the two battery groups works in a wide temperature range; and the control module is used for receiving a power supply instruction, controlling the battery group working in the wide temperature range to supply power to the load, and switching to another battery group to supply power to the load when the electric quantity of the battery group is lower than a preset threshold value.The above scheme can make the battery pack still have good charging and discharging capacity in a low-temperature environment.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack, a control method for the battery pack, and an electrical power device. Background Technology

[0002] As the main energy source for electrical equipment, the battery pack plays a crucial role in the operation of electrical equipment.

[0003] Among related technologies, lithium batteries have become the mainstream in the market due to their advantages of low cost, long lifespan, and high safety. However, in low-temperature environments, the discharge power and fast-charging performance of lithium batteries decrease significantly, especially in extremely cold environments, where they usually lack charging and discharging capabilities, seriously affecting the operation of electrical equipment. Summary of the Invention

[0004] This application provides a battery pack, a battery pack control method, and an electrical power device to solve the operation problem of electrical power devices in low-temperature environments.

[0005] In a first aspect, embodiments of this application provide a battery pack, including: two battery packs and a control module; both battery packs are used to connect to the same load; one of the two battery packs operates in a wide temperature range;

[0006] The control module is used to receive a power supply indication, control the battery pack operating in a wide temperature range to supply power to the load, and switch to another battery pack to supply power to the load when the battery pack's charge level is lower than a preset threshold.

[0007] In some embodiments, the control module is specifically used for:

[0008] When the battery pack, which operates in a wide temperature range, has a charge level below a preset threshold, a first signal is sent to an external power device. The first signal is used to instruct the external power device to supply power to the load.

[0009] Upon receiving a second signal from the external power device, the system switches to another battery pack to supply power to the load and sends a third signal to the external power device; the second signal is used to instruct the external power device to supply power to the load, and the third signal is used to instruct the external power device to stop supplying power to the load.

[0010] In some embodiments, the battery pack further includes two switching circuits, and each battery pack is connected to the load through a corresponding switching circuit;

[0011] The control module is used to control the switching circuit corresponding to the battery pack to turn on or off, so as to turn on or off the power supply path between the battery pack and the load.

[0012] In some embodiments, the switching circuit includes a first switching unit;

[0013] The first switching unit is connected to both the battery pack and the load.

[0014] When the first switching unit is in the ON state, the battery pack supplies power to the load.

[0015] In some embodiments, the first switching unit includes a first switch and a second switch;

[0016] The first terminal of the first switch is connected to the positive terminal of the battery pack, and the second terminal of the first switch is connected to the positive terminal of the load.

[0017] The first terminal of the second switch is connected to the negative terminal of the battery pack, and the second terminal of the second switch is connected to the negative terminal of the load.

[0018] In some embodiments, the switching circuit further includes a second switching unit;

[0019] The second switching unit is connected in parallel with the first switch between the battery pack and the load;

[0020] The control module is specifically used to control the second switch unit corresponding to the battery pack to conduct, pre-charge the battery pack, and after the pre-charging is completed, control the first switch unit corresponding to the battery pack to conduct, so that the battery pack supplies power to the load.

[0021] In some embodiments, the second switching unit includes a third switch connected in series and a pre-charge resistor;

[0022] The third switch is connected to the positive terminal of the battery pack, and the pre-charge resistor is connected to the positive terminal of the load.

[0023] In some embodiments, the switching circuit further includes a voltage conversion unit;

[0024] The first terminal of the voltage conversion unit is connected to the second terminal of the first switch and the pre-charge resistor, respectively, and the second terminal of the voltage conversion unit is connected to the positive terminal of the load.

[0025] The voltage conversion unit is used to convert the output voltage of the battery pack into the power supply voltage required by the load.

[0026] In some embodiments, the battery pack further includes a heating assembly connected to the battery pack operating over a wide temperature range;

[0027] The control module is also used to control the battery pack operating in a wide temperature range to supply power to the heating component, so that the heating component heats another battery pack.

[0028] In some embodiments, the control module is specifically used for:

[0029] During the process of the battery pack operating in a wide temperature range supplying power to the load, the battery pack operating in a wide temperature range is controlled to supply power to the heating component;

[0030] or,

[0031] During the process of the battery pack operating in a wide temperature range supplying power to the load, and when the ambient temperature is lower than a preset temperature, the battery pack operating in a wide temperature range is controlled to supply power to the heating component.

[0032] In some embodiments, the battery pack operating in a wide temperature range is a sodium-ion battery pack, and the other battery pack is a lithium-ion battery pack.

[0033] In a second aspect, embodiments of this application provide a battery pack control method, applied to the battery pack described in any one of the first aspects, the method comprising:

[0034] In response to a power supply indication, the battery pack, operating over a wide temperature range, is controlled to supply power to the load.

[0035] When the charge of the battery pack operating in a wide temperature range is less than a preset threshold, the power supply is switched to another battery pack to supply power to the load.

[0036] In some embodiments, switching to another battery pack to power the load includes:

[0037] Send a first signal to an external power device, the first signal being used to instruct the external power device to supply power to the load;

[0038] Upon receiving a second signal from an external power device, the system switches to the other battery pack to supply power to the load and sends a third signal to the external power device. The second signal is used to instruct the external power device to supply power to the load, and the third signal is used to instruct the external power device to stop supplying power to the load.

[0039] In some embodiments, the method further includes:

[0040] During the process of the battery pack operating in a wide temperature range supplying power to the load, the battery pack operating in a wide temperature range is controlled to supply power to the heating component, so that the heating component heats another battery pack;

[0041] or,

[0042] During the process of the battery pack operating in a wide temperature range supplying power to the load, and when the ambient temperature is lower than a preset temperature, the battery pack operating in a wide temperature range is controlled to supply power to the heating component so that the heating component heats another battery pack.

[0043] Thirdly, embodiments of this application provide an electrical power device, the electrical power device including a load and a battery pack electrically connected to the load, the battery pack being the battery pack described in any one of the first aspects.

[0044] Fourthly, this application provides an electronic device, including: a memory and a processor;

[0045] The memory is used to store computer instructions; the processor is used to execute the computer instructions stored in the memory to implement the method of any of the second aspects.

[0046] Fifthly, this application provides a computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the method of any of the second aspects.

[0047] In a sixth aspect, this application provides a computer program product, including a computer program that, when executed by a processor, implements the method of any one of the second aspects.

[0048] This application provides a battery pack, a control method for the battery pack, and an electrical power device. The battery pack includes two battery groups and a control module. Both battery groups are used to connect to the same load. One of the battery groups operates in a wide temperature range. The control module receives a power supply indication and controls the battery group operating in the wide temperature range to supply power to the load. When the charge of the first battery group is lower than a preset threshold, the module switches to the other battery group to supply power to the load. By prioritizing the use of the first battery group operating in the wide temperature range to supply power to the load, the load can still operate normally in low-temperature environments. When the charge of the first battery group is insufficient, the module switches to the second battery group. Since the heat dissipated by the first battery group during power supply can heat the second battery group, the second battery group can also start normally to supply power to the load in low-temperature environments, thus enabling the load to continue operating in low-temperature environments. This solution not only solves the problem of poor charge and discharge capacity of lithium-ion battery packs in low-temperature environments but also extends the power supply time of the battery pack. Attached Figure Description

[0049] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 1 ;

[0050] Figure 2 A schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 2 ;

[0051] Figure 3 A schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 3 ;

[0052] Figure 4 A schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 4 ;

[0053] Figure 5 A schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 5 ;

[0054] Figure 6 A schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 6 ;

[0055] Figure 7 A schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 7 ;

[0056] Figure 8 A flowchart illustrating a battery pack control method provided in this application embodiment. Figure 1 ;

[0057] Figure 9 A schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 8 ;

[0058] Figure 10 A flowchart illustrating a battery pack control method provided in this application embodiment. Figure 2 ;

[0059] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] In the embodiments of this application, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect, without limiting their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" do not necessarily imply that they are different.

[0062] It should be noted that, in the embodiments of this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0063] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0064] As the main energy source for electrical equipment, the battery pack plays a crucial role in the operation of electrical equipment.

[0065] Lithium batteries have become the mainstream in the market due to their advantages of low cost, long life and high safety. However, in low-temperature environments, the discharge power and fast charging performance of lithium batteries decrease significantly, especially in extremely cold environments (such as below -30°C), where they usually do not have the ability to charge and discharge, which seriously affects the use of electrical equipment.

[0066] In view of this, embodiments of this application provide a battery pack, a battery pack control method, and an electrical power device to solve the problem of using electrical power devices in low-temperature environments.

[0067] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be implemented independently or in combination with each other. The same or similar concepts or processes may not be described again in some embodiments.

[0068] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 1 ,like Figure 1 As shown, the battery pack includes a housing, battery pack 1 and battery pack 2 disposed inside the housing, and a control module 3. Battery pack 1 and battery pack 2 are both connected to the same load outside the battery pack.

[0069] The control module 3 is connected to the battery pack 1 and the battery pack 2 respectively, and is used to control the two battery packs to supply power to the load.

[0070] In some embodiments, one of the battery packs 1 and 2 is a battery pack that operates in a wide temperature range (e.g., -40°C to +65°C), while the other battery pack has a relatively narrow operating temperature range (e.g., -10°C to +45°C).

[0071] It should be understood that the operating temperature range of a battery pack refers to the battery pack's ability to charge and discharge normally at any temperature within that temperature range. For ease of description, the battery pack operating in a wide temperature range will be referred to as the first battery pack, and the other battery pack will be referred to as the second battery pack.

[0072] In some embodiments, the first battery pack may be a sodium-ion battery pack, the second battery pack may be a lithium-ion battery pack, and the control module of the battery pack may be a battery management system (BMS) of the battery pack.

[0073] To address the issue of poor usability of current lithium battery packs in low-temperature environments, the control module of the battery pack in this embodiment controls the first battery pack to supply power to the external load upon receiving a power supply signal to supply power to the load. Since the first battery pack operates over a wide temperature range, it still possesses good charging and discharging capabilities even in extremely cold environments, enabling it to supply power to the external load and ensure its normal operation.

[0074] In some embodiments, while the first battery pack is supplying power to the load, the control module can also monitor the power level of the first battery pack in real time. When the power level of the first battery pack falls below a preset threshold, the control module can switch from the first battery pack to the second battery pack to supply power to the external load. Since the first battery pack generates heat and dissipates it to the outside during the power supply process, causing the temperature of the entire battery pack to rise (i.e., heating the second battery pack), when switching to the second battery pack to supply power to the external load, even if the external environment is still in a low-temperature environment, the second battery pack can still start normally and supply power to the external load so that the external load can work normally.

[0075] The battery pack provided in this application prioritizes the use of a first battery pack operating over a wide temperature range to power the load, enabling the load to continue operating normally in low-temperature environments. When the first battery pack's charge is insufficient, it switches to a second battery pack. Since the heat dissipated by the first battery pack during power supply can heat the second battery pack, it can also start normally and supply power to the load in low-temperature environments, thus allowing the load to continue operating in low-temperature conditions. This solution not only solves the problem of poor charge and discharge capacity of lithium-ion battery packs in low-temperature environments but also extends the power supply time of the battery pack.

[0076] Figure 2A schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 2 ,like Figure 2 As shown, the battery pack also includes two switching circuits, and each battery pack is connected to the load through a corresponding switching circuit.

[0077] After receiving the power supply signal, the control module can control the switching circuit corresponding to the first battery pack to turn on, so as to connect the power supply path between the first battery pack and the load, so that the first battery pack can supply power to the load.

[0078] When the control module detects that the power level of the first battery pack is lower than a preset threshold, it can control the switching circuit corresponding to the second battery pack to turn on, so as to open the power supply path between the second battery pack and the load, and control the switching circuit corresponding to the first battery pack to turn off, so as to close the power supply path between the first battery pack and the load, thereby switching the battery pack that supplies power to the load from the first battery pack to the second battery pack.

[0079] In some embodiments, when the first battery pack supplies power to an external load, the first battery pack is in a high-voltage output state. At this time, the second battery pack is not working. When switching to the second battery pack, if the power supply path between the second battery pack and the load is directly connected, the voltage of the first battery pack and the second battery pack are inconsistent, which may cause the first battery pack to reverse charge the second battery pack, resulting in a safety problem for the battery pack.

[0080] To avoid the aforementioned problems and improve battery pack safety, the control module can send a first signal to an external power source when it detects that the charge level of the first battery pack is below a preset threshold. This signal instructs the external power source to temporarily supply power to the load. For example, if the battery pack corresponds to a vehicle, the external power source could be the vehicle's engine. When the control module detects that the charge level of the first battery pack is below the preset threshold, it can send a first signal to the engine, instructing the engine to temporarily supply power to the vehicle's overall load.

[0081] After the external power device supplies power to the load, it sends a second signal to the control module. Upon receiving the second signal, the control module controls the switching circuit corresponding to the first battery pack to turn off, thus cutting off the power supply path between the first battery pack and the load. Then, it controls the switching circuit corresponding to the second battery pack to turn on, thus connecting the power supply path between the second battery pack and the load. While the control module is controlling the switching circuit corresponding to the second battery pack to turn on, it can send a third signal to the external power device to instruct it to stop supplying power to the load.

[0082] In the above scheme, during the switching from the first battery pack to the second battery pack, the load is temporarily powered by an external power device. This avoids the problem of the high-voltage battery pack recharging the low-voltage battery pack due to the voltage inconsistency between the first and second battery packs, thereby improving the safety of the battery pack.

[0083] Based on the above embodiments, the specific configuration of the switching circuit will be further explained below with reference to several accompanying drawings.

[0084] Figure 3 This is a schematic diagram of a battery pack structure provided in an embodiment of this application, such as... Figure 3 As shown, the switching circuit also includes a first switching unit.

[0085] The first switching unit is connected to both the battery pack and the load; when the first switching unit is in the ON state, the battery pack supplies power to the load. It should be understood that the switching circuits corresponding to the first battery pack and the second battery pack have the same structure.

[0086] In some embodiments, taking the first battery pack as an example, such as Figure 3 As shown, the first switching unit includes a first switch and a second switch.

[0087] The first terminal of the first switch is connected to the positive terminal of the first battery pack, and the second terminal of the switch is connected to the positive terminal of the load; the first terminal of the second switch is connected to the negative terminal of the battery pack, and the second terminal of the second switch is connected to the negative terminal of the load.

[0088] When the control module controls the first battery pack to supply power to the load, it can control the first switch and the second switch to be turned on, thereby establishing a power supply path between the first battery pack and the load. When switching from the first battery pack to the second battery pack, the control module can control the first switch and / or the second switch to be turned off, thereby cutting off the power supply path between the first battery pack and the load.

[0089] The first switch and the second switch can be relays, contactors, or electronic switches; this application does not impose any restrictions on them.

[0090] In some embodiments, such as Figure 4 As shown, the switching circuit further includes a second switching unit, which is connected in parallel with the first switch between the battery pack and the load. The second switching unit is used to precharge the battery pack.

[0091] When the control module receives a power supply signal, it controls the second switch unit and the second switch in the corresponding switching circuit of the first battery pack to conduct, forming a pre-charge circuit for the first battery pack. This pre-charges the first battery pack, reducing the impact of the large current generated at the moment the circuit is turned on on the components in the battery pack and improving the safety of the battery pack. After the first battery pack is pre-charged, the control module controls the first switch corresponding to the first battery pack to conduct and the second switch unit to turn off, completing the high-voltage power supply to the first battery pack so that it can supply power to the load.

[0092] When switching to the second battery pack, the control module controls the first and second switches corresponding to the first battery pack to turn off, and controls the second switch unit and the second switch corresponding to the second battery pack to turn on to form a pre-charge circuit for the first battery pack, pre-charging the second battery pack. After the second battery pack is pre-charged, the control module controls the first switch corresponding to the second battery pack to turn on and the second switch unit to turn off, completing the high-voltage power supply of the second battery pack and switching to the second battery pack to supply power to the load.

[0093] In some embodiments, such as Figure 5 As shown, the second switching unit includes a third switch connected in series and a pre-charge resistor. The control module can control the switching on and off of the second switching unit by controlling the conduction or cutoff of the third switch. The pre-charge resistor can be a wire-wound resistor, a metal oxide film resistor, an adjustable resistor, etc., and this embodiment does not limit its application to this type.

[0094] In some embodiments, such as Figure 6 As shown, the switching circuit also includes a voltage conversion unit. The first terminal of the voltage conversion unit is connected to the second terminal of the first switch and the pre-charge resistor, respectively. The second terminal of the voltage conversion unit is connected to the positive terminal of the load.

[0095] The voltage conversion unit is used to convert the output voltage of the battery pack into the supply voltage required by the load. For example, the voltage conversion unit can be a DC / DC voltage converter. The voltage conversion unit can convert the voltage when the output voltage of the battery pack is inconsistent with the voltage required by the load, thereby improving the stability of the battery pack.

[0096] In some embodiments, the switching circuit may further include a circuit protection unit and a circuit monitoring unit. The circuit protection unit is disposed between the positive terminal of the battery pack and the positive terminal of the load, and is used to provide safety protection for the load or battery pack. For example, the circuit protection unit can be a device with a fuse function. When the current in the switching circuit is too high, the circuit protection unit will automatically fuse to reduce the risk of fire caused by high current.

[0097] A circuit monitoring unit can be installed between the negative terminal of the battery pack and the positive terminal of the load to monitor parameters such as voltage, temperature, and current of the battery pack. For example, the circuit monitoring unit can be a High Voltage Safety Unit (HVSU). The circuit monitoring unit can send the collected information to the control module or the control unit of the electrical equipment containing the battery pack, so that it can perform corresponding control based on the received information.

[0098] In some embodiments, the energy density of the first battery pack operating over a wide temperature range is typically low. Limited by the size of the battery pack, the capacity of the first battery pack is usually not very high, meaning its power supply time is short. To avoid the problem that the heat emitted by the first battery pack is insufficient to heat the second battery pack to a suitable temperature when the first battery pack's capacity is below a preset threshold, thus preventing the second battery pack from starting up when switching to power, a heating component for heating the second battery pack is also provided in the battery pack. This heating component can be located on the surface of the second battery pack and / or inside the second battery pack.

[0099] In some embodiments, such as Figure 7 As shown, a heating component is disposed on the surface of the second battery pack and is connected to the first battery pack. While the first battery pack is supplying power to the load, the control module can also control the switch in the path between the first battery pack and the heating component to conduct, so that the first battery pack supplies power to the heating component, causing the heating component to heat up and thus heat the second battery pack. This solution, by using a heating component, can quickly heat the second battery pack, avoiding the problem of insufficient heating of the second battery pack due to the short power supply time of the first battery pack.

[0100] In some embodiments, since the first battery pack supplies high voltage power to the load, while the heating component typically requires low voltage, the first battery pack can be connected to the heating component via a corresponding voltage conversion unit to avoid the impact of high voltage on the heating component. When supplying power to the heating component, the control module can control the voltage conversion unit to step down the supply voltage from the first battery pack to the heating component's operating voltage, thereby preventing damage to the heating component caused by high voltage.

[0101] In some embodiments, since the charging and discharging capacity of the second battery pack is reduced in cold environments and normal in normal temperature environments, when the second battery pack is heated by the heating component, the control module can also obtain the ambient temperature. When the ambient temperature is lower than the preset temperature, the control module controls the first battery pack to supply power to the heating component, thereby reducing the power consumption of the first battery pack in non-cold environments and increasing the power supply time of the first battery pack.

[0102] Based on the above embodiments, this application also provides a battery pack control method, which applies to the battery pack shown in any of the above embodiments.

[0103] Figure 8 This is a flowchart illustrating a battery pack control method provided in an embodiment of this application, as shown below. Figure 8 As shown, it includes the following steps:

[0104] S801, in response to a power supply indication, controls the battery pack operating in a wide temperature range to supply power to the load.

[0105] The execution entity in this application embodiment can be the control module of the battery pack, such as the BMS of the battery pack.

[0106] In some embodiments, when the control module receives a power supply signal that requires power to an external load, it can turn on the switching circuit between the first battery pack (i.e., the battery pack operating in a wide temperature range) and the load so that the first battery pack supplies power to the load.

[0107] S802. When the battery pack's charge is less than a preset threshold, switch to another battery pack to supply power to the load.

[0108] In some embodiments, while the first battery pack is supplying power to the load, the control module can also monitor the power level of the first battery pack in real time. When the power level of the first battery pack is lower than a preset threshold, the control module can turn off the switching circuit between the first battery pack and the load, and turn on the switching circuit between the second battery pack and the load, switching from the first battery pack to the second battery pack to supply power to the external load.

[0109] In some embodiments, to prevent the first battery pack from recharging the second battery pack, the control module can send a first signal to an external power device when it detects that the power of the first battery pack is lower than a preset threshold, instructing the external power device to temporarily supply power to the load.

[0110] After the external power device supplies power to the load, it sends a second signal to the control module. Upon receiving the second signal, the control module controls the switching circuit corresponding to the first battery pack to turn off, thus cutting off the power supply path between the first battery pack and the load. Then, it controls the switching circuit corresponding to the second battery pack to turn on, thus connecting the power supply path between the second battery pack and the load. While the control module is controlling the switching circuit corresponding to the second battery pack to turn on, it can send a third signal to the external power device to instruct it to stop supplying power to the load.

[0111] In some embodiments, when the control module receives a power supply signal that requires power to an external load, it can control the second switching unit in the switching circuit corresponding to the first battery pack to precharge the first battery pack. After the precharging is completed, the control module turns on the first switching unit between the first battery pack and the load and turns off the second switching unit so that the first battery pack can supply power to the load.

[0112] In some embodiments, when switching to the second battery pack for power supply, the control module can control the second switching unit in the switching circuit corresponding to the second battery pack to precharge the second battery pack. After the precharging is completed, the control module turns on the first switching unit between the second battery pack and the load and turns off the second switching unit so that the second battery pack can supply power to the load.

[0113] In some embodiments, while the first battery pack is supplying power to the load, the control module can also control the switch in the path between the first battery pack and the heating component located at the second battery pack to be turned on, so that the first battery pack supplies power to the heating component, thereby causing the heating component to heat up and heat the second battery pack.

[0114] In some embodiments, when the first battery pack is supplying power to the load and the temperature of the external environment is lower than a preset temperature, the control module can also control the switch in the path between the first battery pack and the heating component located at the second battery pack to be turned on, so that the first battery pack supplies power to the heating component, thereby causing the heating component to heat up and heat the second battery pack.

[0115] Based on the above embodiments, combined with Figure 9 and Figure 10 The present application will be described with reference to a specific embodiment of the battery pack and the battery pack control method.

[0116] like Figure 9 As shown, the battery pack includes a sodium-ion battery pack and a lithium-ion battery pack, which are connected to a load via a switching circuit, respectively.

[0117] The switching circuit corresponding to the sodium-ion battery pack includes a main positive relay K1, a main negative relay K3, a precharge relay K5, a precharge resistor R1, a dual electronically controlled fuse FU1, an HVSU, and a voltage converter DC / DC (optional).

[0118] The switching circuit corresponding to the lithium-ion battery pack includes a main positive relay K2, a main negative relay K4, a pre-charge relay K6, a pre-charge resistor R2, a dual electronically controlled fuse FU2, and HVSU.

[0119] like Figure 10 As shown, the control method for the battery pack includes the following steps:

[0120] S1 and BMS receive the power supply signal.

[0121] S2 and BMS control the main negative relay K3 and pre-charge relay K5 to close, thus opening the pre-charge circuit of the sodium-ion battery pack and pre-charging the sodium-ion battery.

[0122] S3. BMS determines whether pre-charging is complete. If so, proceed with step S4.

[0123] Pre-charging completion can be achieved when the pre-charging time reaches a preset duration, or when the current in the pre-charging circuit reaches a preset current.

[0124] S4, BMS controls the main positive relay K1 to close and the pre-charge relay K5 to open, completing the high-voltage power-on of the sodium-ion battery pack.

[0125] S5, the sodium-ion battery pack begins to supply power to the load.

[0126] S6. The BMS monitors whether the charge of the sodium-ion battery pack is less than a preset threshold (e.g., 15%). If so, the steps shown in S7 can be executed.

[0127] S7 and BMS send a start signal to the engine so that the engine can supply power to the load.

[0128] When S8 and BMS receive the indication signal sent by the engine, they control the main positive relay K1 and the main negative relay K3 to open, and the main negative relay K4 and the pre-charge relay K6 to close, thus opening the pre-charge circuit of the lithium-ion battery pack and pre-charging the lithium-ion battery.

[0129] S9. BMS determines whether pre-charging is complete. If so, it executes the steps shown in S10.

[0130] S10 and BMS control the main positive relay K2 to close and the pre-charge relay K6 to open, completing the high-voltage power-on of the lithium-ion battery pack.

[0131] S11, BMS sends a stop signal to the engine to stop the engine from supplying power to the load.

[0132] S12, The lithium-ion battery pack supplies power to the load.

[0133] The battery pack control method provided in this application embodiment initiates pre-charging of the sodium-ion battery pack when the BMS receives a power supply signal. After pre-charging, the high-voltage circuit of the sodium-ion battery pack is connected. When the BMS detects that the sodium-ion battery pack's charge level is not lower than a set value E0 (e.g., 15% SOC), the sodium-ion battery pack is used to supply power to the entire load. Conversely, if the charge level is lower, the engine is started, the sodium-ion battery pack power supply circuit is disconnected, the lithium-ion battery pack power supply circuit is connected, and then the engine is turned off, completing the switch from sodium-ion battery pack power supply to lithium-ion battery pack power supply. This allows the battery pack to maintain output capability even in low-temperature environments, enabling it to supply power to electrical equipment and ensuring its normal operation.

[0134] This application also provides an electrical power device, which may include the battery pack shown in any of the above embodiments. The electrical power device may be a vehicle, a ship, or an aircraft; this application does not impose any limitations on this.

[0135] This application also provides an electronic device that can be used as a control module in any of the above embodiments.

[0136] Figure 11 This is a schematic diagram of the structure of the electronic device 110 provided in the embodiments of this application, as shown below. Figure 5 As shown, it includes:

[0137] Processor 1101.

[0138] Memory 1102 is used to store executable instructions for the terminal device.

[0139] Specifically, the program may include program code, which includes computer operation instructions. Memory 1102 may include high-speed RAM, and may also include non-volatile memory, such as at least one disk storage device.

[0140] The processor 1101 is used to execute computer execution instructions stored in the memory 1102 to implement the technical solution of the API gateway production verification method embodiment described in the foregoing method embodiment.

[0141] The processor 1101 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0142] Optionally, the electronic device 110 may also include a communication interface 1103, through which it can communicate and interact with external devices, such as user terminals (e.g., mobile phones, tablets). In specific implementations, if the communication interface 1103, memory 1102, and processor 1101 are implemented independently, then the communication interface 1103, memory 1102, and processor 1101 can be interconnected via a bus to complete communication between them.

[0143] A bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc., but this does not mean there is only one bus or one type of bus.

[0144] Optionally, in a specific implementation, if the communication interface 1103, memory 1102 and processor 1101 are integrated on a single chip, then the communication interface 1103, memory 1102 and processor 1101 can communicate through an internal interface.

[0145] This application also provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the technical solution of the above-described battery pack control method embodiment. Its implementation principle and technical effect are similar, and will not be repeated here.

[0146] In one possible implementation, a computer-readable medium may include random access memory (RAM), read-only memory (ROM), compact discread-only memory (CD-ROM) or other optical disc storage, disk storage or other magnetic storage devices, or any other medium targeted to carry or to store the required program code in the form of instructions or data structures, and accessible by a computer. Furthermore, any connection is appropriately referred to as a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. As used herein, disks and optical discs include optical discs, laser discs, optical discs, Digital Versatile Discs (DVDs), floppy disks, and Blu-ray discs, where disks typically reproduce data magnetically, while optical discs optically reproduce data using lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0147] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the technical solution of the above-described battery pack control method embodiment. Its implementation principle and technical effects are similar, and will not be repeated here.

[0148] In the specific implementation of the aforementioned terminal device or server, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly manifested as execution by a hardware processor, or execution by a combination of hardware and software modules within the processor.

[0149] Those skilled in the art will understand that all or part of the steps in any of the above method embodiments can be implemented by hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium, and when the program is executed, all or part of the steps in the above method embodiments are performed.

[0150] If the technical solution of this application is implemented in software form and sold or used as a product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the technical solution of this application can be embodied in the form of a software product, which is stored in a storage medium and includes a computer program or several instructions. This computer software product causes a computer device (which may be a personal computer, server, network device, or similar electronic device) to execute all or part of the steps of the method described in the embodiments of this application.

[0151] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0152] It should be further noted that although the steps in the flowchart are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0153] It should be understood that the above-described device embodiments are merely illustrative, and the device of this application can also be implemented in other ways. For example, the division of units / modules in the above embodiments is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units, modules, or components may be combined, or integrated into another system, or some features may be ignored or not executed.

[0154] Furthermore, unless otherwise specified, the functional units / modules in the various embodiments of this application can be integrated into one unit / module, or each unit / module can exist physically separately, or two or more units / modules can be integrated together. The integrated units / modules described above can be implemented in hardware or as software program modules.

[0155] When integrated units / modules are implemented in hardware, the hardware can be digital circuits, analog circuits, etc. The physical implementation of the hardware structure includes, but is not limited to, transistors, memristors, etc. Unless otherwise specified, the processor can be any suitable hardware processor, such as a CPU, GPU, FPGA, DSP, and ASIC, etc. Unless otherwise specified, the storage unit can be any suitable magnetic or magneto-optical storage medium, such as Resistive Random Access Memory (RRAM), Dynamic Random Access Memory (DRAM), Static Random Access Memory (SRAM), Enhanced Dynamic Random Access Memory (EDRAM), High-Bandwidth Memory (HBM), Hybrid Memory Cube (HMC), etc.

[0156] If the integrated unit / module is implemented as a software program module and sold or used as an independent product, it can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned memory includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0157] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, include: Two battery packs and a control module; both battery packs are used to connect to the same load; one of the two battery packs operates in a wide temperature range; The control module is used to receive a power supply indication, control the battery pack operating in a wide temperature range to supply power to the load, and switch to another battery pack to supply power to the load when the battery pack's charge level is lower than a preset threshold.

2. The battery pack according to claim 1, characterized in that, The control module is specifically used for: When the battery pack, which operates in a wide temperature range, has a charge level below a preset threshold, a first signal is sent to an external power device. The first signal is used to instruct the external power device to supply power to the load. Upon receiving a second signal from the external power device, the system switches to another battery pack to supply power to the load and sends a third signal to the external power device; the second signal is used to instruct the external power device to supply power to the load, and the third signal is used to instruct the external power device to stop supplying power to the load.

3. The battery pack according to claim 2, characterized in that, The battery pack also includes two switching circuits, and each battery pack is connected to the load through a corresponding switching circuit. The control module is used to control the switching circuit corresponding to the battery pack to turn on or off, so as to turn on or off the power supply path between the battery pack and the load.

4. The battery pack according to claim 3, characterized in that, The switching circuit includes a first switching unit; The first switching unit is connected to both the battery pack and the load. When the first switching unit is in the ON state, the battery pack supplies power to the load.

5. The battery pack according to claim 4, characterized in that, The first switching unit includes a first switch and a second switch; The first terminal of the first switch is connected to the positive terminal of the battery pack, and the second terminal of the first switch is connected to the positive terminal of the load. The first terminal of the second switch is connected to the negative terminal of the battery pack, and the second terminal of the second switch is connected to the negative terminal of the load.

6. The battery pack according to claim 5, characterized in that, The switching circuit also includes a second switching unit; The second switching unit is connected in parallel with the first switch between the battery pack and the load; The control module is specifically used to control the second switch unit corresponding to the battery pack to conduct, pre-charge the battery pack, and after the pre-charging is completed, control the first switch unit corresponding to the battery pack to conduct, so that the battery pack supplies power to the load.

7. The battery pack according to claim 6, characterized in that, The second switching unit includes a third switch connected in series and a pre-charge resistor; The third switch is connected to the positive terminal of the battery pack, and the pre-charge resistor is connected to the positive terminal of the load.

8. The battery pack according to claim 7, characterized in that, The switching circuit also includes a voltage conversion unit; The first terminal of the voltage conversion unit is connected to the second terminal of the first switch and the pre-charge resistor, respectively, and the second terminal of the voltage conversion unit is connected to the positive terminal of the load. The voltage conversion unit is used to convert the output voltage of the battery pack into the power supply voltage required by the load.

9. The battery pack according to any one of claims 1-8, characterized in that, The battery pack also includes a heating assembly connected to the battery pack which operates over a wide temperature range; The control module is also used to control the battery pack operating in a wide temperature range to supply power to the heating component, so that the heating component heats another battery pack.

10. The battery pack according to claim 9, characterized in that, The control module is specifically used for: During the process of the battery pack operating in a wide temperature range supplying power to the load, the battery pack operating in a wide temperature range is controlled to supply power to the heating component; or, During the process of the battery pack operating in a wide temperature range supplying power to the load, and when the ambient temperature is lower than a preset temperature, the battery pack operating in a wide temperature range is controlled to supply power to the heating component.

11. The battery pack according to any one of claims 1-8, characterized in that, The battery pack operating in a wide temperature range is a sodium-ion battery pack, and the other battery pack is a lithium-ion battery pack.

12. A method for controlling a battery pack, characterized in that, Applied to a battery pack as described in any one of claims 1 to 11, the method comprises: In response to a power supply indication, the battery pack, which operates over a wide temperature range, is controlled to supply power to the load. When the charge of the battery pack operating in a wide temperature range is less than a preset threshold, the power supply is switched to another battery pack to supply power to the load.

13. The method according to claim 12, characterized in that, The switching to another battery pack to supply power to the load includes: Send a first signal to an external power device, the first signal being used to instruct the external power device to supply power to the load; Upon receiving a second signal from an external power device, the system switches to the other battery pack to supply power to the load and sends a third signal to the external power device. The second signal is used to instruct the external power device to supply power to the load, and the third signal is used to instruct the external power device to stop supplying power to the load.

14. The method according to claim 13, characterized in that, The method further includes: During the process of the battery pack operating in a wide temperature range supplying power to the load, the battery pack operating in a wide temperature range is controlled to supply power to the heating component so that the heating component heats another battery pack. or, During the process of the battery pack operating in a wide temperature range supplying power to the load, and when the ambient temperature is lower than a preset temperature, the battery pack operating in a wide temperature range is controlled to supply power to the heating component so that the heating component heats another battery pack.

15. An electrical energy device, characterized in that, The electrical power equipment includes a battery pack as described in any one of claims 1 to 11.

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