Energy storage device, chassis, and vehicle

Abstract

The application discloses an energy storage device, a chassis and a vehicle, wherein the energy storage battery comprises a first battery pack and a second battery pack connected in series, a control circuit is connected with a common node of the first battery pack and the second battery pack and an energy storage circuit, and a controller can control the control circuit, so that the first battery pack and the second battery pack are charged with each other through the energy storage circuit, the energy storage battery is heated in a pulse self-heating mode, the cost is reduced, the heating film heating or the cooling liquid heating is replaced, the energy storage device is simpler, and the arrangement and simplification of the energy storage device are facilitated.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to an energy storage device, chassis, and vehicle. Background Technology

[0002] With the increasing power demands of intelligent vehicles and chassis systems, current low-voltage systems in both gasoline and electric vehicles typically only provide 48V and 12V low-voltage power distribution, failing to provide AC power to AC loads within the vehicle. Furthermore, current outdoor power supplies usually only provide DC power and cannot offer AC power to users; they also suffer from poor performance in low-temperature conditions.

[0003] In related technologies, the battery heating solutions in vehicle power supplies or outdoor power supplies typically use external heaters to heat the battery, which results in a poor user experience and poor low-temperature performance of the battery. Utility Model Content

[0004] In view of the above problems, this application provides an energy storage device, chassis and vehicle, and aims to provide an energy storage device with self-heating function.

[0005] The first aspect of this application provides an energy storage device, including:

[0006] The energy storage battery includes a first battery pack and a second battery pack, wherein the first battery pack and the second battery pack are connected in series.

[0007] Energy storage circuit;

[0008] The control circuit is connected to the common node and energy storage circuit of the first battery pack and the second battery pack.

[0009] The control circuit is controlled by the controller to control the first battery pack and the second battery pack to charge each other through the energy storage circuit.

[0010] In the technical solution of this application embodiment, the energy storage battery includes a first battery pack and a second battery pack connected in series. The controller can control the energy transmission direction between the first battery pack, the second battery pack and the first power supply terminal. It can control the first battery pack and the second battery pack to charge each other through the energy storage inductor and heat the energy storage battery by pulse self-heating. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0011] In some embodiments, the energy storage device further includes:

[0012] A voltage conversion circuit is connected to the energy storage battery and the first power supply terminal respectively, and is used to control the voltage conversion between the energy storage battery and the first power supply terminal;

[0013] The control circuit includes at least one half-bridge in the voltage conversion circuit.

[0014] In the technical solution of this application embodiment, a voltage conversion circuit is disposed between the control circuit and the first power supply terminal. It controls the voltage conversion between the energy storage battery and the first power supply terminal. The voltage conversion circuit can boost the DC power supplied by the energy storage battery and output it to the first power supply terminal, providing AC power to the first power supply terminal. The control circuit includes at least one half-bridge in the voltage conversion circuit. In self-heating mode, the controller can control at least one half-bridge in the voltage conversion circuit, enabling the energy storage circuit and the energy storage battery to charge each other. This uses pulse self-heating to heat the energy storage battery, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0015] In some embodiments, the voltage conversion circuit is further configured to convert the DC power supplied by the energy storage battery into AC power and output it to the first power supply terminal.

[0016] In the technical solution of this application embodiment, the control circuit can alternately output pulse current from its first and second battery packs when the energy storage battery is at a low temperature, using pulse self-heating to heat the energy storage battery. Furthermore, the voltage conversion circuit is used to convert the DC power provided by the energy storage battery into AC power and output it to the first power supply terminal, facilitating the provision of AC power to vehicles. It can also serve as a portable power source to provide AC power to users in outdoor, low-temperature environments, reducing costs and replacing heating film heating or coolant heating, making the energy storage device simpler and facilitating its layout and simplification.

[0017] In some embodiments, the voltage conversion circuit includes:

[0018] A boost unit, connected to the energy storage battery, is used to convert the DC power output from the energy storage battery into AC power, and then boost the voltage before outputting it to at least one of the half-bridges.

[0019] In the technical solution of this application embodiment, the boost unit is connected to the energy storage battery. The transformer turns ratio in the boost unit can be adjusted according to the voltage of the energy storage battery and the required voltage. The boost unit can boost the output voltage of the energy storage battery to obtain AC output, so that the energy storage battery can provide the required AC power to the outside through the first power supply terminal, which is convenient for providing AC power to vehicles and also convenient for providing AC power to users in outdoor, low-temperature and other environments. Furthermore, by setting the common node of the first battery pack and the second battery pack to be connected to the energy storage circuit through the second switching unit, the first battery pack and the second battery pack can alternately output pulse current when the energy storage battery is in a low-temperature condition, and heat the energy storage battery by pulse self-heating. This not only reduces costs, but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0020] In some embodiments, the voltage conversion circuit includes:

[0021] A rectifier unit, connected between the boost unit and the control circuit, is used to convert the AC power output by the boost unit into DC power and output it to at least one of the half-bridges.

[0022] In the technical solution of this application embodiment, the boost unit is connected to the energy storage battery. The transformer turns ratio in the boost unit can be adjusted according to the voltage of the energy storage battery and the required voltage. The boost unit can boost the output voltage of the energy storage battery to obtain AC output. Then, the rectifier unit rectifies the high-voltage AC to obtain the corresponding DC output to the control circuit. Thus, the energy storage battery provides the required AC power to the outside through the first power supply terminal, which is convenient for providing AC power to vehicles and for providing AC power to users in outdoor, low-temperature, and other environments. Furthermore, by setting the potential midpoint of the energy storage battery to be connected to the first power supply terminal through the second switch unit, the inductor in the control circuit can be shared. When the energy storage battery is in a low-temperature condition, its first battery pack and second battery pack alternately output pulse current to heat the energy storage battery by pulse self-heating. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0023] In some embodiments, the control circuit is further configured to convert the electrical energy supplied by the first power supply terminal into a charging current to charge the energy storage battery.

[0024] In some embodiments, the control circuit includes:

[0025] The first half-bridge has its AC side connected to the first power supply terminal via the energy storage circuit.

[0026] In the technical solution of this application embodiment, the voltage conversion circuit can be set between the energy storage battery and the first power supply terminal. The voltage conversion circuit can be used to control the voltage conversion between the energy storage battery and the first power supply terminal. The voltage conversion circuit can boost the DC power provided by the energy storage battery and output it to the first power supply terminal. The AC side of the first half-bridge is connected to the first power supply terminal through the energy storage circuit. The first half-bridge in the voltage conversion circuit can control the mutual charging between the energy storage battery and the energy storage circuit, thereby using pulse self-heating to heat the energy storage battery, replacing heating film heating or coolant heating, making the structure of the battery device simpler and facilitating the layout and simplification of the battery system.

[0027] In some embodiments, the control circuit includes the first half-bridge; the control circuit further includes:

[0028] The first switching unit is connected between the energy storage battery and the DC side of the first half-bridge, and is used to control the connection status between the energy storage battery and the DC side of the first half-bridge.

[0029] The second switching unit is connected between the common node of the first battery pack and the second battery pack and the first power supply terminal;

[0030] The first switching unit, the second switching unit, and the first half-bridge are controlled by a controller to control the first battery pack and the second battery pack to charge each other through the energy storage circuit.

[0031] In the technical solution of this application embodiment, the control circuit includes a first half-bridge in the voltage conversion circuit. The first half-bridge in the voltage conversion circuit is multiplexed by the control circuit. The energy storage battery includes a first battery pack and a second battery pack connected in series. The controller can control the energy transmission direction between the first battery pack, the second battery pack and the first power supply terminal, so that the energy storage battery can be AC ​​powered to the outside through the first switching unit and the control circuit. The energy storage battery can also be charged by the first power supply terminal through the control circuit and the first switching unit. Furthermore, the first battery pack and the second battery pack can be controlled to charge each other through the energy storage circuit. The energy storage battery is heated by pulse self-heating, which not only reduces the cost, but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0032] In some embodiments, the control circuit further includes:

[0033] The second half-bridge is connected in parallel with the first half-bridge.

[0034] In some embodiments, the boost unit includes: a first switching transistor, a second switching transistor, and a first transformer;

[0035] The first end of the primary winding of the first transformer is connected to the negative terminal of the energy storage battery via the first switching transistor, the second end of the primary winding of the first transformer is connected to the negative terminal of the energy storage battery via the second switching transistor, and the center tap of the primary winding of the first transformer is connected to the positive terminal of the energy storage battery.

[0036] In the technical solution of this application embodiment, a first switching transistor, a second switching transistor, and a first transformer constitute a boost unit. The boost unit boosts the low-voltage DC power output from the energy storage battery. The turns ratio of the first transformer can be adjusted according to the voltage of the energy storage battery and the required voltage. The boost unit can boost the output voltage of the energy storage battery to obtain AC power output. Then, the rectifier unit rectifies the high-voltage AC power to obtain the corresponding DC power output to the control circuit. Thus, the energy storage battery provides high-voltage AC power to the outside through the first power supply terminal. Furthermore, by setting the potential midpoint of the energy storage battery to be connected to the first power supply terminal through the second switching unit, the energy storage inductor can be shared. When the energy storage battery is in a low-temperature condition, its first battery pack and second battery pack alternately output pulse current to heat the energy storage battery in a pulse self-heating manner. This facilitates the provision of AC power to vehicles and can also be used as a portable power source to provide AC power to users in outdoor, low-temperature environments. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0037] In some embodiments, the energy storage device further includes: a first energy storage capacitor unit, the two ends of which are respectively connected to the DC positive bus and the DC negative bus of the control circuit.

[0038] In the technical solution of this application embodiment, the output current of the energy storage battery can be output to the DC side of the control circuit through the first switching unit to charge the first energy storage capacitor unit. The DC current on its DC side is converted into AC current by the control circuit and output to the first power supply terminal to provide AC power. Furthermore, by setting the potential midpoint of the energy storage battery to be connected to the first power supply terminal through the second switching unit, the energy storage inductor can be shared. When the energy storage battery is in a low temperature condition, its first battery pack and second battery pack alternately output pulse current to heat the energy storage battery in a pulse self-heating manner. This facilitates the provision of AC power to the vehicle and can also be used as a portable power source to provide AC power to users in outdoor, low-temperature environments. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0039] In some embodiments, the energy storage device further includes: a second energy storage capacitor unit, the two ends of which are respectively connected to the first end and the second end of the first power supply terminal.

[0040] In some embodiments, the energy storage device further includes a battery management circuit connected between the energy storage battery and a first DC power supply terminal, for managing the DC charging and discharging process of the energy storage battery.

[0041] In the technical solution of this application embodiment, the battery management circuit is controlled by the controller. When a DC load is connected to the DC first power supply terminal, the controller can control the battery management circuit to enable the energy storage battery to provide DC power to the DC first power supply terminal. When DC power is connected to the DC first power supply terminal, the controller can control the battery management circuit to enable the DC first power supply terminal to charge the energy storage battery through the battery management circuit.

[0042] In some embodiments, the first switching unit includes:

[0043] The first bus switch is connected between the DC positive bus of the control circuit and the positive terminal of the energy storage battery, and is controlled by the controller to turn on or off.

[0044] The second bus switch is connected between the DC side negative bus of the control circuit and the negative terminal of the energy storage battery, and is controlled by the controller to turn on or off.

[0045] In some embodiments, the energy storage circuit includes at least a portion of the energy storage devices in the voltage conversion circuit.

[0046] In some embodiments, the control circuit includes: a first half-bridge and a second half-bridge, wherein the first half-bridge and the second half-bridge are connected in parallel;

[0047] The first end of the energy storage circuit is connected to the midpoint of the first half-bridge, and the second end of the energy storage circuit is connected to the midpoint of the second half-bridge.

[0048] In the technical solution of this application embodiment, by setting the first end of the energy storage circuit to be connected to the midpoint of the first half-bridge and the second end of the energy storage circuit to be connected to the midpoint of the second half-bridge, the energy storage battery and the energy storage circuit can be mutually charged by the control circuit. The energy storage battery can be heated by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0049] In some embodiments, the voltage conversion circuit includes a first transformer;

[0050] The energy storage circuit includes the winding of the first transformer, the first end of the primary winding of the first transformer is connected to the midpoint of the first half-bridge, and the second end of the primary winding of the first transformer is connected to the midpoint of the second half-bridge.

[0051] In the technical solution of this application embodiment, the first transformer in the voltage conversion circuit can perform voltage conversion processing on the input voltage. By reusing the winding of the first transformer in the voltage conversion circuit, there is no need to set up additional energy storage devices, saving the cost of the battery power supply architecture. The energy storage battery and the winding of the first transformer are mutually charged by the control circuit. The energy storage battery can be heated by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0052] In some embodiments, the voltage conversion circuit includes an energy storage inductor;

[0053] The energy storage circuit includes the energy storage inductor, with a first end connected to the midpoint of the first half-bridge and a second end connected to the midpoint of the second half-bridge.

[0054] In the technical solution of this application embodiment, by reusing the energy storage inductor in the voltage conversion circuit, there is no need to set up additional energy storage devices, saving the cost of the battery power supply architecture. The energy storage battery and the energy storage inductor are mutually charged by the control circuit. The energy storage battery can be heated by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0055] In some embodiments, the energy storage circuit includes:

[0056] An energy storage inductor is connected to the control circuit. The first end of the energy storage inductor is connected to the midpoint of the first half-bridge, and the second end of the energy storage inductor is connected to the midpoint of the second half-bridge. The energy storage battery charges the energy storage inductor through the control circuit.

[0057] In the technical solution of this application embodiment, by additionally setting an energy storage inductor, the impact on the voltage conversion circuit can be reduced. Even when the voltage conversion circuit is working, the control circuit can control the energy storage battery and the energy storage inductor to charge each other. The energy storage battery can be heated by pulse self-heating instead of heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0058] In some embodiments, the energy storage circuit further includes an energy storage switch, which is connected in series with the energy storage inductor.

[0059] In the technical solution of this application embodiment, an additional energy storage inductor and energy storage switch are provided in the energy storage circuit. The connection state of the energy storage inductor is controlled by the energy storage switch, which can reduce the impact of the energy storage inductor on the voltage conversion circuit and the energy storage battery. When the energy storage battery does not need to be self-heated, the energy storage switch is controlled to be turned off. When the voltage conversion circuit is working, the control circuit can also control the energy storage battery and the energy storage inductor to charge each other. Pulse self-heating can be used to heat the energy storage battery, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0060] In the technical solution of this application embodiment, by controlling the state of the first half-bridge, during the energy storage battery discharge stage, the first battery pack charges and stores energy in the energy storage circuit through the first half-bridge. Then, during the energy storage battery charging stage, the energy storage circuit charges the second battery pack through the first half-bridge. Then, by controlling the state of the first half-bridge, during the energy storage battery discharge stage, the second battery pack charges and stores energy in the energy storage circuit through the first half-bridge. During the energy storage battery charging stage, the energy storage circuit charges the first battery pack through the first half-bridge. This allows the first battery pack and the second battery pack in the energy storage battery to charge each other through the energy storage circuit, thereby heating the energy storage battery by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0061] In some embodiments, the voltage conversion circuit includes a first transformer;

[0062] The energy storage circuit includes the winding of the first transformer. The first end of the primary winding of the first transformer is connected to the midpoint of the half-bridge of the first half-bridge, and the second end of the primary winding of the first transformer is connected to the common node of the first battery pack and the second battery pack.

[0063] In the technical solution of this application embodiment, the energy storage battery includes a first battery pack and a second battery pack connected in series. A first transformer in the multiplexed voltage conversion circuit is used as the energy storage device in the energy storage circuit. The first end of the primary winding of the first transformer is connected to the midpoint of the half-bridge of the first half-bridge, and the second end of the primary winding of the first transformer is connected to the common node of the first battery pack and the second battery pack. During the discharge phase of the energy storage battery, by controlling the state of the first half-bridge, the first battery pack charges and stores energy through the primary winding of the first transformer via the first half-bridge. Then, during the charging phase of the energy storage battery, the primary winding of the first transformer charges the second battery pack via the first half-bridge. Then, by controlling the state of the first half-bridge, during the discharge phase of the energy storage battery, the second battery pack charges and stores energy through the energy storage circuit via the first half-bridge. During the charging phase of the energy storage battery, the energy storage circuit charges the first battery pack via the first half-bridge. Thus, the first battery pack and the second battery pack in the energy storage battery charge each other through the energy storage circuit. The energy storage battery is heated by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0064] In some embodiments, the voltage conversion circuit includes an energy storage inductor;

[0065] The energy storage circuit includes the energy storage inductor, the first end of which is connected to the midpoint of the first half-bridge, and the second end of which is connected to the common node of the first battery pack and the second battery pack.

[0066] In the technical solution of this application embodiment, the energy storage inductor in the voltage conversion circuit is reused as the energy storage device in the energy storage circuit. The first end of the energy storage inductor in the voltage conversion circuit is connected to the midpoint of the first half-bridge, and the second end of the energy storage inductor in the voltage conversion circuit is connected to the common node of the first battery pack and the second battery pack. During the energy storage battery discharge phase, by controlling the state of the first half-bridge, the first battery pack charges and stores energy through the energy storage inductor in the voltage conversion circuit via the first half-bridge. Then, during the energy storage battery charging phase, the energy storage inductor in the voltage conversion circuit charges and stores energy through the first half-bridge to the second battery pack. The battery pack is charged, and then the state of the first half-bridge is controlled. During the discharge phase of the energy storage battery, the second battery pack charges and stores energy through the energy storage inductor in the voltage conversion circuit via the first half-bridge. During the charging phase of the energy storage battery, the energy storage inductor in the voltage conversion circuit charges the first battery pack through the first half-bridge. This allows the first and second battery packs in the energy storage battery to charge each other through the energy storage inductor in the voltage conversion circuit. Thus, the energy storage battery is heated by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0067] In some embodiments, the energy storage circuit includes:

[0068] An energy storage inductor is connected to the control circuit. The first end of the energy storage inductor is connected to the midpoint of the first half-bridge, and the second end of the energy storage inductor is connected to the common node of the first battery pack and the second battery pack. The energy storage battery charges each other through the control circuit and the energy storage inductor.

[0069] In the technical solution of this application embodiment, by additionally setting an energy storage inductor, the impact on the voltage conversion circuit can be reduced. Even when the voltage conversion circuit is working, the control circuit can control the first battery pack and the second battery pack in the energy storage battery to charge each other through the energy storage inductor, thereby heating the energy storage battery by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0070] In some embodiments, the energy storage circuit further includes an energy storage switch, which is connected in series with the energy storage inductor.

[0071] In the technical solution of this application embodiment, an additional energy storage inductor and energy storage switch are provided in the energy storage circuit. The connection state of the energy storage inductor is controlled by the energy storage switch, which can reduce the impact of the energy storage inductor on the voltage conversion circuit and the energy storage battery. When the energy storage battery does not need to be self-heated, the energy storage switch is controlled to be turned off. When the voltage conversion circuit is working, the first battery pack and the second battery pack in the energy storage battery are controlled to charge each other through the energy storage inductor, thereby heating the energy storage battery by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0072] In some embodiments, the energy storage device further includes a second power supply terminal connected to the energy storage battery, and a battery management circuit disposed between the second power supply terminal and the energy storage battery;

[0073] The energy storage device is also used to control the energy storage battery to output DC power to the second power supply terminal via the battery management circuit in DC power supply mode.

[0074] In the technical solution of this application embodiment, the second power supply terminal is connected to the positive and negative terminals of the energy storage battery. When the energy storage battery needs to provide DC power to the outside, the battery power supply architecture works in DC power supply mode, controlling the energy storage battery to output DC power to the second power supply terminal through the battery management circuit.

[0075] In some embodiments, the battery management circuit and the control circuit are controlled by the same controller.

[0076] In the technical solution of this application embodiment, the control circuit and the battery management circuit include the same controller. By deeply integrating the control motherboard of the battery management circuit and the control circuit of the self-heating function, the battery management circuit and the control circuit of the self-heating function can share the same main control chip (i.e., controller). The controller integrates the functions of managing the charging and discharging process of the battery and the self-heating control, thereby reducing the volume occupied by the power system inside the vehicle.

[0077] In some embodiments, the controller is further configured to, in self-heating mode, control the first battery pack and the second battery pack to alternately generate pulse currents through the energy storage circuit so as to charge the first battery pack and the second battery pack to each other.

[0078] In the technical solution of this application embodiment, when the temperature of the energy storage battery is lower than the first preset temperature threshold, the controller can operate in self-heating mode to control the second switching unit to conduct. By controlling the duty cycle of the first switching unit, the inductor in the energy storage battery reuse control circuit is made to alternately output pulse current from the first battery pack and the second battery pack to heat the energy storage battery by pulse self-heating. This not only reduces costs, but also reduces the total voltage and current ripple during pulse heating, making heating safer. It also replaces heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0079] In some embodiments, the controller is further configured to control the energy storage battery to output AC power to the first power supply terminal via the control circuit in a first AC power supply mode.

[0080] In the technical solution of this application embodiment, when the required voltage of the AC load is low, the controller can also operate in the first AC power supply mode. The control circuit converts the DC power provided by the energy storage battery into corresponding AC power and outputs it to the first power supply terminal, without the need for a voltage conversion circuit to boost the DC power provided by the energy storage battery. Furthermore, by setting the midpoint of the energy storage battery's potential to be connected to the first power supply terminal via the second switching unit, the energy storage inductor can be shared. When the energy storage battery is in a low-temperature condition, its first and second battery packs alternately output pulse currents to heat the energy storage battery using pulse self-heating. This facilitates the provision of AC power to the vehicle and can also serve as a portable power source to provide AC power to users in outdoor, low-temperature environments. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating its layout and simplification.

[0081] In some embodiments, the controller is further configured to control the energy storage battery to output AC power to the first power supply terminal via the voltage conversion circuit and the control circuit in a second AC power supply mode.

[0082] In the technical solution of this application embodiment, when the AC load is connected to the first power supply terminal, the controller controls the boost unit to convert the DC power output from the energy storage battery into high-voltage AC power. Then, the high-voltage DC power is rectified by the rectifier unit to obtain the DC side of the high-voltage DC power output control circuit. The control circuit converts the high-voltage DC power into corresponding AC power and outputs it to the first power supply terminal. This allows the energy storage battery to achieve AC power supply through the boost unit, rectifier unit, and control circuit. Furthermore, by setting the midpoint of the energy storage battery's potential to be connected to the first power supply terminal through the second switch unit, the energy storage inductor can be shared. When the energy storage battery is in a low-temperature condition, its first battery pack and second battery pack alternately output pulse current to heat the energy storage battery using pulse self-heating. This facilitates the provision of AC power to the vehicle and can also be used as a portable power source to provide AC power to users in outdoor, low-temperature, and other environments. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating its layout and simplification.

[0083] In some embodiments, the controller is further configured to, in charging mode, control the control circuit to convert the AC power from the first power supply terminal into DC power and charge the energy storage battery.

[0084] In the technical solution of this application embodiment, when AC power is connected to the first power supply terminal, the AC power is converted into corresponding DC power through the control circuit and output to both ends of the energy storage battery through the first switching unit to charge the energy storage battery. This allows the AC charging pile to directly charge the energy storage battery through the control circuit and the first switching unit, realizing independent charging of the energy storage battery and improving the charging efficiency of the energy storage battery.

[0085] In some embodiments, the controller is further configured to control the first battery pack and the second battery pack to perform power balancing via the control circuit in a balancing mode, so as to reduce the power difference between the first battery pack and the second battery pack.

[0086] In the technical solution of this application embodiment, when the difference in charge level between the first battery pack and the second battery pack is greater than a first preset charge threshold, the controller can control the second switching unit to conduct. By controlling the duty cycle of the first switching unit, the inductor in the energy storage battery reuse control circuit charges the battery pack with higher charge level to the battery pack with lower charge level, thereby achieving charge balance between the first and second battery packs. Furthermore, after a first preset rest period, the controller again detects the difference in charge level between the first and second battery packs. If the difference in charge level is still greater than the first preset charge threshold, the controller again selects the battery pack with higher charge level to charge the battery pack with lower charge level until the difference in charge level between the first and second battery packs is less than a second preset charge threshold. This second preset charge threshold is less than the first preset charge threshold, and the second preset charge threshold can be set to be less than 1% of the first battery pack's charge level.

[0087] A second aspect of this application provides a chassis including a battery-powered architecture as described in any of the foregoing embodiments.

[0088] In the technical solution of this application embodiment, by integrating the energy storage device described in any of the above embodiments into the vehicle chassis, the chassis can supply power to the functional load and / or drive load in the vehicle. The control circuit is connected to the common node of the first battery pack and the second battery pack and the energy storage circuit. The controller can control the control circuit so that the first battery pack and the second battery pack charge each other through the energy storage circuit. The energy storage battery is heated by pulse self-heating, which not only reduces the cost, but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0089] A third aspect of this application provides a vehicle that includes an energy storage device as described in any of the above embodiments; or includes a chassis as described in the above embodiments.

[0090] In the technical solution of this application embodiment, the vehicle can be an electric vehicle or a fuel vehicle. By setting an energy storage device on the vehicle, and by setting a control circuit to connect the common node and energy storage circuit of the first battery pack and the second battery pack, the first battery pack and the second battery pack can charge each other through the energy storage inductor. The energy storage battery is heated by pulse self-heating, which not only reduces the cost, but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0091] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0092] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0093] Figure 1 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0094] Figure 2 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0095] Figure 3 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0096] Figure 4 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0097] Figure 5 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0098] Figure 6 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0099] Figure 7 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0100] Figure 8 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0101] Figure 9 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0102] Figure 10 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0103] Figure 11 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0104] Figure 12 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0105] Figure 13A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0106] Figure 14 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0107] Figure 15 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0108] Figure 16 A schematic diagram of one possible battery power supply architecture provided in an embodiment of this application;

[0109] Figure 17 This is a schematic diagram of one possible battery power supply architecture provided in an embodiment of this application. Detailed Implementation

[0110] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0111] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0112] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0113] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The phrase "second connection port" at various locations in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0114] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0115] In the description of the embodiments of this application, the term "multiple frames" refers to two or more (including two).

[0116] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0117] In related technologies, the battery heating solutions in vehicle power supplies or outdoor power supplies typically use external heaters to heat the battery, which results in problems such as large size, poor user experience, and poor low-temperature performance of the battery.

[0118] To address the aforementioned technical problems, this application provides an energy storage device, see [link to relevant documentation]. Figure 1 As shown, the energy storage device in this embodiment includes: an energy storage battery 100, a control circuit 300, and an energy storage circuit 200. The energy storage circuit 200 includes a first battery pack B1 and a second battery pack B2, which are connected in series. The control circuit 300 is connected to the energy storage battery 100, and the common node of the first battery pack B1 and the second battery pack B2 is connected to the energy storage circuit 200 via the control circuit 300. The control circuit 300 is controlled by a controller 700 to control the first battery pack B1 and the second battery pack B2 to charge each other via the energy storage circuit 200.

[0119] In this embodiment, the control circuit 300 is connected to the common node of the first battery pack B1 and the second battery pack B2 and the energy storage circuit 200. The controller 700 can control the control circuit 300 so that the first battery pack B1 and the second battery pack B2 charge each other through the energy storage circuit 200 and heat the energy storage battery 100 by pulse self-heating. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0120] In some embodiments, combined with Figure 1As shown, the energy storage circuit 200 includes an energy storage device between the control circuit 300 and the first power supply terminal 610. The energy storage device connected to the first power supply terminal 610 can be reused to charge the energy storage battery 100, thereby realizing pulse self-heating of the energy storage battery 100. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0121] In some embodiments, see Figure 2 As shown, the energy storage device also includes a voltage conversion circuit 400, which is connected to the energy storage battery 100 and the first power supply terminal 610 respectively. The voltage conversion circuit 400 is used to control the voltage conversion between the energy storage battery 100 and the first power supply terminal 610. The control circuit 300 includes at least one half-bridge in the voltage conversion circuit.

[0122] In this embodiment, the voltage conversion circuit 400 and the control circuit 300 connect to the energy storage battery 100. The voltage conversion circuit 400 boosts the DC power supplied by the energy storage battery 100 and outputs it to the control circuit 300, which then provides AC power to the first power supply terminal 610. Alternatively, in self-heating mode, the energy storage circuit 200 can be charged, and then the control circuit 300 controls the energy storage inductor to charge the energy storage battery 100. This pulse self-heating method replaces heating film heating or coolant heating, simplifying the battery device and facilitating the layout and streamlining of the battery system.

[0123] In some embodiments, combined with Figure 2 As shown, the voltage conversion circuit 400 is also used to convert the DC power provided by the energy storage battery 100 into AC power and output it to the first power supply terminal 610.

[0124] In this embodiment, the control circuit 300 can alternately output pulse currents from its first battery pack B1 and second battery pack B2 when the energy storage battery 100 is in a low-temperature condition, using pulse self-heating to heat the energy storage battery 100. Furthermore, the control circuit 300 can convert the DC power provided by the voltage converter 400 into AC power and output it to the first power supply terminal 610, facilitating the provision of AC power to vehicles. It can also serve as a portable power source to provide AC power to users in outdoor, low-temperature environments, reducing costs and replacing heating film heating or coolant heating, thus simplifying the energy storage device and promoting its layout and conciseness.

[0125] In some embodiments, the energy storage device can be applied to the low-voltage power distribution system of a vehicle to provide low-voltage AC power to the vehicle and meet the AC load power demand of the vehicle. The output voltage of its first power supply terminal 610 can be 220V AC power.

[0126] In some embodiments, the energy storage device can be an independent portable power source, conveniently providing AC power to users in outdoor, low-temperature environments. Furthermore, in this energy storage device, by setting the midpoint of the energy storage battery 100's potential to be connected to the first power supply terminal 610 via the second switching unit 432, the inductors in the control circuit 300 can be shared. When the energy storage battery 100 is in a low-temperature condition, its first battery pack B1 and second battery pack B2 alternately output pulse currents to charge each other using pulse self-heating. This not only reduces costs but also results in lower total voltage and current ripple during pulse heating, making heating safer. It also replaces heating film heating or coolant heating, making the energy storage device simpler and smaller, which is beneficial for expanding the application scenarios of the energy storage device outdoors.

[0127] In some embodiments, see Figure 3 As shown, the voltage conversion circuit 400 further includes a boost unit 410, which is connected to the energy storage battery 100. The boost unit 410 is used to boost the DC power output from the energy storage battery 100 to obtain AC power output to at least one half-bridge in the voltage conversion circuit 400.

[0128] In this embodiment, the boost unit 410 is connected to the energy storage battery 100. The transformer turns ratio in the boost unit 410 can be adjusted according to the voltage of the energy storage battery 100 and the required voltage. The boost unit 410 can boost the output voltage of the energy storage battery 100 to obtain AC power output to at least one half-bridge in the voltage conversion circuit 400, so that the energy storage battery 100 can provide high-voltage AC power to the outside through the first power supply terminal 610, which is convenient for providing AC power to vehicles and also convenient for providing AC power to users in outdoor, low-temperature and other environments.

[0129] In some embodiments, see Figure 3 As shown, the voltage conversion circuit 400 further includes a rectifier unit 420, which is connected between the boost unit 410 and the control circuit 300, and is used to convert the high-voltage AC power output by the boost unit 410 into DC power and output it to at least one half-bridge in the voltage conversion circuit 400.

[0130] In this embodiment, the boost unit 410 is connected to the energy storage battery 100. The transformer turns ratio in the boost unit 410 can be adjusted according to the voltage of the energy storage battery 100 and the required voltage. The boost unit 410 can boost the output voltage of the energy storage battery 100 to obtain AC output. Then, the rectifier unit 420 rectifies the high-voltage AC to obtain the corresponding DC output to the control circuit 300. Furthermore, by setting the midpoint of the potential of the energy storage battery 100 to be connected to the first power supply terminal 610 through the second switch unit 432, the inductors in the control circuit 300 can be shared. When the energy storage battery 100 is in a low-temperature condition, its first battery group B1 and second battery group B2 alternately output pulse current to charge each other by pulse self-heating. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0131] In some embodiments, combined with Figure 1 As shown, the voltage conversion circuit 400 is also used to convert the electrical energy provided by the first power supply terminal 610 into a charging current to charge the energy storage battery 100.

[0132] In this embodiment, the control circuit 300 can convert the electrical energy provided by the first power supply terminal 610 into a charging current to charge the energy storage battery 100, thereby achieving the charging purpose of the energy storage battery 100. Furthermore, by reusing at least a portion of the energy storage devices between the first power supply terminal 610 and the control circuit 300, the cost of the battery power supply architecture can be saved. The control circuit 300 controls the energy storage battery 100 and at least a portion of the energy storage devices to charge each other. Pulse self-heating can be used to heat the energy storage battery 100, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0133] In some embodiments, see Figure 4 As shown, the voltage conversion circuit 400 includes a first half-bridge 310, the AC side of which is connected to the first power supply terminal 610 via an energy storage circuit 200.

[0134] In this embodiment, the energy storage battery 100 includes a first battery pack B1 and a second battery pack B2 connected in series. The AC side of the first half-bridge 310 is connected to the first power supply terminal 610 via the energy storage circuit 200. The first half-bridge 310 can control the first battery pack B1 and the second battery pack B2 to charge each other via the energy storage circuit 200. The energy storage battery 100 can be heated by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0135] In some embodiments, see Figure 4As shown, the voltage conversion circuit 400 includes: a first half-bridge 310, a first switching unit 431, and a second switching unit 432. The AC side of the first half-bridge 310 is connected to the first power supply terminal 610 via the energy storage circuit 200. The first switching unit 431 is connected between the energy storage battery 100 and the DC side of the first half-bridge 310, and is used to control the connection state between the energy storage battery 100 and the DC side of the first half-bridge 310. The second switching unit 432 is connected between the common node of the first battery pack B1 and the second battery pack B2 and the first power supply terminal 610. The first switching unit 431, the second switching unit 432, and the first half-bridge 310 are controlled by the controller 700 to control the first battery pack B1 and the second battery pack B2 to charge each other via the energy storage circuit 200.

[0136] In this embodiment, the energy storage battery 100 includes a first battery pack B1 and a second battery pack B2 connected in series. The controller 700 controls the operation of the first switching unit 431, the second switching unit 432, and the control circuit 300 to control the charging and discharging process of the energy storage battery 100, or to control the pulse self-heating process of the energy storage battery 100. For example, when an AC load is connected to the first power supply terminal 610, the control circuit 300 can convert the DC power provided by the energy storage battery 100 into AC power and output it to the first power supply terminal 610. The energy storage battery 100 can then provide AC power to an external source through the control circuit 300. When a charging gun is connected to the first power supply terminal 610, the energy storage battery 100 can also be charged from the first power supply terminal 610 via the control circuit 300 and the first switching unit 431. Furthermore, by setting the midpoint of the potential of the energy storage battery 100 to be connected to the first power supply terminal 610 via the second switch unit 432, the energy storage circuit 200 can reuse the energy storage device connected to the first power supply terminal 610. When the energy storage battery 100 is in a low temperature condition, its first battery pack B1 and second battery pack B2 alternately output pulse current through the energy storage device, and the first battery pack B1 and the second battery pack B2 charge each other, thereby heating the energy storage battery 100 by pulse self-heating. This not only reduces costs, but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0137] In some embodiments, see Figure 5 As shown, the voltage conversion circuit 400 also includes a second half-bridge 320, which is connected in parallel with the first half-bridge 310.

[0138] In this embodiment, the first half-bridge 310 and the second half-bridge 320 form a full-bridge inverter circuit. The full-bridge inverter circuit is controlled by the controller 700 and can realize voltage conversion between the energy storage battery 100 and the first power supply terminal 610, as well as voltage conversion between the voltage conversion circuit and the first power supply terminal 610.

[0139] In some embodiments, see Figure 5 As shown, the first half-bridge 310 includes a ninth switch Q9 and a tenth switch Q10, and the common node of the ninth switch Q9 and the tenth switch Q10 serves as the midpoint of the first half-bridge 310.

[0140] In some embodiments, see Figure 5 As shown, the second half-bridge 320 includes an eleventh switch Q11 and a twelfth switch Q12, and the common node of the eleventh switch Q11 and the twelfth switch Q12 serves as the midpoint of the second half-bridge 320.

[0141] In some embodiments, see Figure 5 As shown, the second switching unit 432 includes a self-heating control switch K21, which can connect the common node of the first battery pack B1 and the second battery pack B2 to the first power supply terminal 610, thereby reusing the energy storage device of the first power supply terminal 610.

[0142] In some embodiments, when the temperature of the energy storage battery 100 is low, the controller 700 operates in a self-heating mode. By controlling the switching states of the first half-bridge 310, the first switching unit 431, and the second switching unit 432, the energy storage device between the first power supply terminal 610 and the control circuit can be reused. At this time, the equivalent circuit of the energy storage device is as follows: Figure 6 As shown, by controlling the first half-bridge 310, the first battery pack B1 and the second battery pack B2 can alternately output pulse current to charge each other by pulse self-heating. This not only reduces costs, but also reduces the total voltage and current ripple during pulse heating, making heating safer. It also replaces heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0143] In some embodiments, see Figure 5 As shown, the rectifier unit 420 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 form a diode rectifier bridge to rectify the AC power output from the boost unit 410 and output the corresponding DC power to the positive DC bus and the negative DC bus of the control circuit 300.

[0144] In some embodiments, see Figure 5As shown, the boost unit 410 includes: a first switch Q1, a second switch Q2, and a first transformer T1; the first end of the primary winding of the first transformer T1 is connected to the negative terminal of the energy storage battery 100 via the first switch Q1, the second end of the primary winding of the first transformer T1 is connected to the negative terminal of the energy storage battery 100 via the second switch Q2, and the middle tap of the primary winding of the first transformer T1 is connected to the positive terminal of the energy storage battery 100.

[0145] In this embodiment, the first switch Q1, the second switch Q2, and the first transformer T1 form a boost unit 410. The boost unit 410 boosts the low-voltage DC power output from the energy storage battery 100. The turns ratio of the first transformer T1 can be adjusted according to the voltage of the energy storage battery 100 and the required voltage. The boost unit 410 can boost the output voltage of the energy storage battery 100 to obtain AC power output. Then, the rectifier unit 420 rectifies the high-voltage AC power to obtain the corresponding DC power output to the control circuit 300. Thus, the energy storage battery 100 provides high-voltage AC power to the outside world through the first power supply terminal 610. Furthermore, by setting the midpoint of the potential of the energy storage battery 100 to be connected to the first power supply terminal 610 via the second switch unit 432, the energy storage inductor L1 can be shared. When the energy storage battery 100 is in a low temperature condition, its first battery pack B1 and second battery pack B2 alternately output pulse current to charge each other by pulse self-heating. This facilitates providing AC power to vehicles in low temperature conditions and can also be used as a portable power source to provide AC power to users in outdoor and low temperature environments. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0146] In some embodiments, the first battery pack B1 and the second battery pack B2 have the same output voltage, and the midpoint of the potential of the energy storage battery 100 can be the common node of the first battery pack B1 and the second battery pack B2.

[0147] In some embodiments, the first switch Q1 and the second switch Q2 can be N-type MOSFETs.

[0148] In some embodiments, when the energy storage device operates in heating mode, the first switch Q1 and the second switch Q2 are turned off. Since the midpoint of the potential of the energy storage battery 100 is connected to the first power supply terminal 610 via the second switch unit 432, and then connected to the energy storage battery 100 via the first power supply terminal 610, the energy storage inductor L1 in the control circuit 300, and the first switch unit 431, the controller 700 controls the switching states of the first switch unit 431 and the second switch unit 432, resulting in the following... Figure 6The equivalent circuit shown reuses the energy storage inductor L1 between the first power supply terminal 610 and the control circuit 300, which allows the first battery pack B1 and the second battery pack B2 to alternately output pulse current and charge each other by pulse self-heating. This facilitates providing AC power to vehicles under low-temperature conditions and can also serve as a portable power source to provide AC power to users in outdoor and low-temperature environments. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating its layout and simplification.

[0149] In some embodiments, a heating control button or heating control switch may be provided on the energy storage device. When the ambient temperature is low, the user can send a corresponding instruction to the controller through the heating control button or heating control switch to control the energy storage device to perform self-heating. When the temperature of the energy storage battery reaches the operating temperature threshold range, the controller 700 controls the energy storage battery to output AC power to the first power supply terminal 610 through the boost unit 410, rectifier unit 420, and control circuit 300, thereby supplying power to the external AC load.

[0150] In some embodiments, a temperature sensor can be installed near the energy storage battery 100 in the energy storage device. When the temperature of the energy storage battery 100 is lower than a first preset temperature threshold, the controller 700 is activated and operates in a self-heating mode. The controller 700 controls the first battery pack B1 and the second battery pack B2 of the energy storage battery 100 to alternately output pulse currents to charge each other by pulse self-heating, thereby mitigating the problem of reduced discharge capacity of the energy storage battery 100 at low temperatures.

[0151] In some embodiments, see Figure 5 As shown, the control circuit 300 further includes a first energy storage capacitor unit C1, the two ends of which are respectively connected to the DC positive bus and the DC negative bus of the control circuit 300.

[0152] In this embodiment, the two ends of the first energy storage capacitor unit C1 are respectively connected to the positive DC bus and the negative DC bus of the control circuit 300. The first energy storage capacitor unit C1 can absorb the inrush current of the positive DC bus and the negative DC bus. The output current of the energy storage battery 100 can be output to the DC side of the control circuit 300 through the first switching unit 431 to charge the first energy storage capacitor unit C1. The control circuit 300 converts the DC power on its DC side into AC power and outputs it to the first power supply terminal 610 to provide AC power to the outside. Furthermore, by setting the energy storage capacitor... The midpoint of the potential of the battery 100 is connected to the first power supply terminal 610 via the second switching unit 432. They can share the energy storage inductor L1. When the energy storage battery 100 is in a low temperature condition, its first battery pack B1 and second battery pack B2 alternately output pulse current to charge each other by pulse self-heating. This makes it convenient to provide AC power to vehicles in low temperature conditions. It can also be used as a portable power source to provide AC power to users in outdoor and low temperature environments. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0153] In some embodiments, the first energy storage capacitor unit C1 includes one or more capacitors, and the two ends of the one or more capacitors are respectively connected to the DC positive bus and the DC negative bus of the control circuit 300.

[0154] In some embodiments, see Figure 5 As shown, the energy storage device also includes a second energy storage capacitor unit C2, the two ends of which are respectively connected to the first end and the second end of the first power supply terminal 610.

[0155] In this embodiment, the second energy storage capacitor unit C2 is connected in parallel with the first power supply terminal 610. By filtering the current of the first power supply terminal 610, the inrush current of the first power supply terminal 610 can be absorbed, thereby reducing the risk of sudden changes in the voltage or current of the first power supply terminal 610.

[0156] In some embodiments, the second energy storage capacitor unit C2 includes one or more capacitors, the two ends of which are respectively connected to the first end and the second end of the first power supply terminal 610.

[0157] In some embodiments, see Figure 7As shown, the energy storage device between the control circuit 300 and the first power supply terminal 610 may include a noise suppression inductor L2 and a buffer capacitor C3. The noise suppression inductor L2 and the buffer capacitor C3 form an LC filter circuit, which helps maintain the voltage stability of the first power supply terminal 610 and reduces the mutual influence between the voltage conversion circuit 400 and the first power supply terminal 610. The noise suppression inductor L2 and the buffer capacitor C3 of the control circuit 300 can form a PFC circuit. The PFC circuit can dynamically adjust the input current waveform to make it in phase with the voltage, significantly improving the power factor and reducing harmonics in the circuit.

[0158] In some embodiments, see Figure 5 As shown, the first switching unit 431 includes a first bus switch K11 and a second bus switch K12. The first bus switch K11 is connected between the positive DC bus of the control circuit 300 and the positive terminal of the energy storage battery 100. The first bus switch K11 is controlled by the controller 700 to turn on or off. The second bus switch K12 is connected between the negative DC bus of the control circuit 300 and the negative terminal of the energy storage battery 100. The second bus switch K12 is controlled by the controller 700 to turn on or off.

[0159] In some embodiments, the energy storage circuit includes at least a portion of the energy storage device in the voltage conversion circuit.

[0160] In some embodiments, as shown in Figure 8, the control circuit 300 includes a first half-bridge 310 and a second half-bridge 320, which are connected in parallel; the first end of the energy storage circuit 200 is connected to the midpoint of the first half-bridge 310, and the second end of the energy storage circuit 200 is connected to the midpoint of the second half-bridge 320.

[0161] In this embodiment, the first end of the energy storage circuit 200 is connected to the midpoint of the first half-bridge 310, and the second end of the energy storage circuit 200 is connected to the midpoint of the second half-bridge 320. By controlling the switching states of the first half-bridge 310 and the second half-bridge 320, the DC power provided by the energy storage battery 100 can charge the energy storage circuit 200. Then, by controlling the switching states of the first half-bridge 310 and the second half-bridge 320, the energy storage circuit 200 can charge the energy storage battery 100. This allows the energy storage battery 100 to be heated using a pulse self-heating method, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0162] In some embodiments, see Figure 8As shown, the voltage conversion circuit 400 includes a first transformer T1; the energy storage circuit 200 includes a winding of the first transformer T1, the first end of the primary winding of the first transformer T1 is connected to the midpoint of the half-bridge of the first half-bridge 310, and the second end of the primary winding of the first transformer T1 is connected to the midpoint of the half-bridge of the second half-bridge 320.

[0163] In this embodiment, the first transformer T1 in the voltage conversion circuit 400 can perform voltage conversion processing on the input voltage. By reusing the winding of the first transformer T1 in the voltage conversion circuit 400, there is no need to set up additional energy storage devices, saving the cost of the battery power supply architecture. The control circuit 300 controls the energy storage battery 100 and the winding of the first transformer T1 to charge each other. The energy storage battery 100 can be heated by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0164] In some embodiments, see Figure 8 As shown, the control circuit 300 also includes diodes D11, D12, D13, and D14. Diode D11 is connected in reverse parallel with the ninth switch Q9, diode D12 is connected in reverse parallel with the tenth switch, diode D13 is connected in reverse parallel with the eleventh switch Q11, and diode D14 is connected in reverse parallel with the twelfth switch Q12.

[0165] In this embodiment, the ninth switch Q9, the tenth switch Q10, the eleventh switch Q11, and the twelfth switch Q12 can be N-type IGBTs or N-type MOSFETs. By placing corresponding diodes between the source and drain of the ninth switch Q9, the tenth switch Q10, the eleventh switch Q11, and the twelfth switch Q12, with the cathode of the diode connected to the drain and the anode of the diode connected to the source, the risk of backflow that may occur during low-current freewheeling can be reduced.

[0166] In some embodiments, see Figure 9 As shown, the voltage conversion circuit 400 includes an energy storage inductor L4; the energy storage circuit 200 includes an energy storage inductor L4, the first end of the energy storage inductor L4 is connected to the midpoint of the first half-bridge 310, and the second end of the energy storage inductor L4 is connected to the midpoint of the second half-bridge 320.

[0167] In this embodiment, the energy storage inductor L4 in the voltage conversion circuit 400 can be connected to its internal transformer or switching transistor. By reusing the energy storage inductor L4 in the voltage conversion circuit 400, there is no need to set up additional energy storage devices, saving the cost of the battery power supply architecture. The control circuit 300 controls the energy storage battery 100 and the energy storage inductor L4 to charge each other. The energy storage battery 100 can be heated by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0168] In some embodiments, see Figure 10 As shown, the energy storage circuit 200 includes: an energy storage inductor L3 connected to the control circuit 300; the first end of the energy storage inductor L3 is connected to the midpoint of the first half-bridge 310; and the second end of the energy storage inductor L3 is connected to the midpoint of the second half-bridge 320. The energy storage battery 100 charges the energy storage inductor L3 through the control circuit 300.

[0169] In this embodiment, by additionally setting the energy storage inductor L3, the impact on the voltage conversion circuit 400 can be reduced. Even when the voltage conversion circuit 400 is working, the control circuit 300 can control the energy storage battery 100 and the energy storage inductor L3 to charge each other. The energy storage battery 100 can be heated by pulse self-heating instead of heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0170] In some embodiments, see Figure 11 As shown, the energy storage circuit 200 also includes an energy storage switch K3, which is connected in series with the energy storage inductor L3.

[0171] In this embodiment, an additional energy storage inductor L3 and an energy storage switch K3 are provided in the energy storage circuit 200. The connection state of the energy storage inductor L3 is controlled by the energy storage switch K3, which can reduce the impact of the energy storage inductor L3 on the voltage conversion circuit 400 and the energy storage battery 100. When the energy storage battery 100 does not need to be self-heated, the energy storage switch K3 is turned off. When the voltage conversion circuit 400 is working, the control circuit 300 can also control the energy storage battery 100 and the energy storage inductor L3 to charge each other. The energy storage battery 100 can be heated by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0172] In some embodiments, see Figure 12 As shown, the control circuit 300 includes a first half-bridge 310; the first end of the energy storage circuit 200 is connected to the midpoint of the first half-bridge 310, and the second end of the energy storage circuit 200 is connected to the common node of the first battery pack B1 and the second battery pack B2.

[0173] In this embodiment, by controlling the state of the first half-bridge 310, during the discharge phase of the energy storage battery 100, the first battery pack B1 charges and stores energy in the energy storage circuit 200 via the first half-bridge 310. Then, during the charging phase of the energy storage battery 100, the energy storage circuit 200 charges the second battery pack B2 via the first half-bridge 310. Then, by controlling the state of the first half-bridge 310, during the discharge phase of the energy storage battery 100, the second battery pack B2 charges and stores energy in the energy storage circuit 200 via the first half-bridge 310. During the charging phase of the energy storage battery 100, the energy storage circuit 200 charges the first battery pack B1 via the first half-bridge 310. This allows the first battery pack B1 and the second battery pack B2 within the energy storage battery 100 to charge each other via the energy storage circuit 200, thereby heating the energy storage battery 100 using pulse self-heating, replacing heating film heating or coolant heating. This simplifies the battery device and facilitates the layout and simplification of the low-voltage power distribution system.

[0174] In some embodiments, see Figure 12 As shown, the voltage conversion circuit 400 includes a first transformer T1; the energy storage circuit 200 includes a winding of the first transformer T1, the first end of the primary winding of the first transformer T1 is connected to the midpoint of the half-bridge of the first half-bridge 310, and the second end of the primary winding of the first transformer T1 is connected to the common node of the first battery pack B1 and the second battery pack B2.

[0175] In this embodiment, the energy storage battery 100 includes a first battery pack B1 and a second battery pack B2 connected in series. A first transformer T1 in the multiplexed voltage conversion circuit 400 serves as the energy storage device in the energy storage circuit 200. The first end of the primary winding of the first transformer T1 is connected to the midpoint of the first half-bridge 310, and the second end of the primary winding of the first transformer T1 is connected to the common node of the first battery pack B1 and the second battery pack B2. During the discharge phase of the energy storage battery 100, by controlling the state of the first half-bridge 310, the first battery pack B1 charges and stores energy in the primary winding of the first transformer T1 via the first half-bridge 310. Then, during the charging phase of the energy storage battery 100, the first transformer... The primary winding of T1 charges the second battery pack B2 via the first half-bridge 310, and then controls the state of the first half-bridge 310. During the discharge phase of the energy storage battery 100, the second battery pack B2 charges and stores energy in the energy storage circuit 200 via the first half-bridge 310. During the charging phase of the energy storage battery 100, the energy storage circuit 200 charges the first battery pack B1 via the first half-bridge 310. This allows the first battery pack B1 and the second battery pack B2 in the energy storage battery 100 to charge each other via the energy storage circuit 200, thereby heating the energy storage battery 100 by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0176] In some embodiments, see Figure 13 As shown, the voltage conversion circuit 400 includes an energy storage inductor L4; the energy storage circuit 200 includes an energy storage inductor L4, the first end of the energy storage inductor L4 is connected to the midpoint of the first half-bridge 310, and the second end of the energy storage inductor L4 is connected to the common node of the first battery pack B1 and the second battery pack B2.

[0177] In this embodiment, the energy storage inductor L4 in the voltage conversion circuit 400 is reused as the energy storage device in the energy storage circuit 200. The first end of the energy storage inductor L4 in the voltage conversion circuit 400 is connected to the midpoint of the first half-bridge 310, and the second end of the energy storage inductor L4 in the voltage conversion circuit 400 is connected to the common node of the first battery pack B1 and the second battery pack B2. During the discharge phase of the energy storage battery 100, by controlling the state of the first half-bridge 310, the first battery pack B1 charges and stores energy in the energy storage inductor L4 in the voltage conversion circuit 400 through the first half-bridge 310. Then, during the charging phase of the energy storage battery 100, the energy storage inductor L4 in the voltage conversion circuit 400 charges and stores energy in the second battery pack B2 through the first half-bridge 310. Group B2 is charged, and then the state of the first half-bridge 310 is controlled. During the discharge stage of the energy storage battery 100, the second battery group B2 charges and stores energy through the energy storage inductor L4 in the voltage conversion circuit 400 via the first half-bridge 310. During the charging stage of the energy storage battery 100, the energy storage inductor L4 in the voltage conversion circuit 400 charges the first battery group B1 via the first half-bridge 310. This allows the first battery group B1 and the second battery group B2 in the energy storage battery 100 to charge each other through the energy storage inductor L4 in the voltage conversion circuit 400. Thus, the energy storage battery 100 is heated by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0178] In some embodiments, see Figure 14 As shown, the energy storage circuit 200 includes: an energy storage inductor L3 connected to the control circuit 300; the first end of the energy storage inductor L3 is connected to the midpoint of the first half-bridge 310; and the second end of the energy storage inductor L3 is connected to the common node of the first battery pack B1 and the second battery pack B2; the energy storage battery 100 charges the energy storage inductor L3 through the control circuit 300.

[0179] In this embodiment, by additionally setting the energy storage inductor L3, the impact on the voltage conversion circuit 400 can be reduced. Even when the voltage conversion circuit 400 is working, the control circuit 300 can control the first battery pack B1 and the second battery pack B2 in the energy storage battery 100 to charge each other through the energy storage inductor L3, thereby heating the energy storage battery 100 by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0180] In some embodiments, see Figure 15 As shown, the energy storage circuit 200 also includes an energy storage switch K3, which is connected in series with the energy storage inductor L3.

[0181] In this embodiment, an additional energy storage inductor L3 and an energy storage switch K3 are provided in the energy storage circuit 200. The connection state of the energy storage inductor L3 is controlled by the energy storage switch K3, which can reduce the impact of the energy storage inductor L3 on the voltage conversion circuit 400 and the energy storage battery 100. When the energy storage battery 100 does not need self-heating, the energy storage switch K3 is turned off. When the voltage conversion circuit 400 is working, the first battery pack B1 and the second battery pack B2 in the energy storage battery 100 are controlled to charge each other through the energy storage inductor L3, thereby heating the energy storage battery 100 by pulse self-heating, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0182] In some embodiments, see Figure 16 As shown, the energy storage switch K3 can be a bidirectional switch.

[0183] In some embodiments, see Figure 16 As shown, the energy storage inductor L3 can be a common-mode inductor.

[0184] In some embodiments, see Figure 17 As shown, the battery power supply architecture also includes a second power supply terminal 620 connected to the energy storage battery 100, and a battery management circuit disposed between the second power supply terminal 620 and the energy storage battery 100; the battery power supply architecture is also used to control the energy storage battery 100 to output DC power to the second power supply terminal 620 through the battery management circuit 630 in DC power supply mode.

[0185] In this embodiment, the second power supply terminal 620 is connected to the positive and negative terminals of the energy storage battery 100. When the energy storage battery 100 needs to provide DC power to the outside, the battery power supply architecture operates in DC power supply mode, controlling the energy storage battery 100 to output DC power to the second power supply terminal 620 through the battery management circuit 630.

[0186] In some embodiments, the battery management circuit 630 and the control circuit 300 are controlled by the same controller.

[0187] In this embodiment, the control circuit 300 and the battery management circuit 630 include the same controller. By deeply integrating the control motherboard of the battery management circuit 630 and the self-heating function control circuit 300, the battery management circuit 630 and the self-heating function control circuit can share the same main control chip (i.e., controller). The controller integrates the functions of managing the battery charging and discharging process and self-heating control, thereby reducing the volume occupied by the power system inside the vehicle.

[0188] In some embodiments, the controller 700 is further configured to control the first battery pack B1 and the second battery pack B2 to alternately generate pulse currents via the energy storage circuit 200 in a self-heating mode, so as to enable the energy storage battery 100 to self-heat.

[0189] In this embodiment, when the temperature of the energy storage battery 100 is lower than the first preset temperature threshold, the controller 700 can operate in a self-heating mode to control the second switching unit 432 to turn on. The equivalent circuit diagram is shown below. Figure 6 As shown, by controlling the duty cycle of the first switching unit 431, the first battery pack B1 and the second battery pack B2 alternately generate pulse currents through the energy storage circuit 200. The first battery pack B1 and the second battery pack B2 charge each other by means of pulse self-heating. This not only reduces costs, but also reduces the total voltage and current ripple during the pulse heating process, making the heating safer. It also replaces heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0190] In some embodiments, the controller 700 is further configured to control the first battery pack B1 and the second battery pack B2 to alternately generate pulse currents via transformers in a bidirectional transformer circuit in a self-heating mode, so as to enable the energy storage battery 100 to self-heat.

[0191] In this embodiment, when the temperature of the energy storage battery 100 is lower than the first preset temperature threshold, the controller 700 can operate in a self-heating mode to control the second switching unit 432 to turn on. The equivalent circuit diagram is shown below. Figure 6 As shown, by controlling the duty cycle of the first switching unit 431, the energy storage circuit 200 reuses the inductor in the control circuit 300 or the transformer in the bidirectional transformer circuit. The first battery pack B1 and the second battery pack B2 alternately output pulse current to charge each other by pulse self-heating. This not only reduces costs, but also reduces the total voltage and current ripple during pulse heating, making heating safer. It also replaces heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the low-voltage power distribution system.

[0192] In some embodiments, the range of the first preset temperature threshold can be 0-15 degrees Celsius.

[0193] In some embodiments, when the temperature of the energy storage battery 100 is lower than a first preset temperature threshold, the controller 700 can operate in a self-heating mode. A half-bridge consisting of the third switch Q3, the fourth switch Q4, and the energy storage inductor L1 is connected to the midpoint of the potential of the energy storage battery 100 via the seventh switch Q7. The seventh switch Q7 and the eighth switch Q8 are connected to the half-bridge bus. A pulse oscillation circuit is formed by the first part of the energy storage battery 100 (i.e., the first battery pack B1), the second part of the energy storage battery 100 (i.e., the second battery pack B2), the third switch Q3, the fourth switch Q4, and the energy storage inductor L1. Its equivalent circuit is as follows: Figure 4 As shown, the third switch Q3 and the fourth switch Q4 switch alternately, and the pulse current superimposed on the low temperature and high internal resistance rapidly self-heats the battery. The excess energy circulates among the first part of the energy storage battery, the energy storage inductor L1, and the second part of the energy storage battery. Apart from the heat loss due to internal resistance, inductor impedance, and switch losses, there is almost no further energy loss. The heating efficiency is very high, and the temperature rise rate is also relatively high.

[0194] In some embodiments, combined with Figure 1 As shown, the controller 700 is also used in the first AC power supply mode to control the energy storage battery 100 to output AC power to the first power supply terminal 610 via the control circuit 300.

[0195] In this embodiment, when the required voltage of the AC load is low, the controller 700 can also operate in the first AC power supply mode. The control circuit 300 converts the DC power provided by the energy storage battery 100 into corresponding AC power and outputs it to the first power supply terminal 610, without the need for a voltage conversion circuit to boost the DC power provided by the energy storage battery 100. Furthermore, by setting the midpoint of the potential of the energy storage battery 100 to be connected to the first power supply terminal 610 via the second switching unit 432, the energy storage inductor can be shared. When the energy storage battery is in a low-temperature condition, its first battery pack B1 and second battery pack B2 alternately output pulse current to heat the energy storage battery through pulse self-heating. This facilitates the provision of AC power to the vehicle and can also be used as a portable power source to provide AC power to users in outdoor, low-temperature environments. This not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating its layout and simplification.

[0196] In some embodiments, combined with Figure 2 As shown, the controller 700 is also used in the second AC power supply mode to control the energy storage battery 100 to output AC power to the first power supply terminal 610 via the voltage conversion circuit 400 and the control circuit 300.

[0197] In this embodiment, the controller 700 operates in a second AC power supply mode. The controller 700 controls the boost unit 410 to convert the DC power output from the energy storage battery 100 into high-voltage AC power. This AC power is then rectified by the rectifier unit 420 to obtain the DC side of the high-voltage DC power output control circuit 300. The control circuit 300 then converts the high-voltage DC power into corresponding AC power and outputs it to the first power supply terminal 610. This allows the energy storage battery 100 to achieve AC power supply through the boost unit 410, the rectifier unit 420, and the control circuit 300. Furthermore, by setting the energy storage battery 100... The midpoint of the potential is connected to the first power supply terminal 610 via the second switching unit 432. They can share the energy storage inductor L1. When the energy storage battery 100 is in a low temperature condition, its first battery pack B1 and second battery pack B2 alternately output pulse current to charge each other by pulse self-heating. This makes it convenient to provide AC power to the vehicle in low temperature conditions. It can also be used as a portable power source to provide AC power to users in outdoor, low temperature and other environments. This not only reduces costs, but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0198] In some embodiments, combined with Figure 4 As shown, the controller 700 can also operate in the second AC power supply mode. The seventh switch Q7, the eighth switch Q8, and the ninth switch Q9 are turned off. The energy of the energy storage battery 100 is used to form a push-pull circuit through the first switch Q1, the second switch Q2, and the first transformer T1. By adjusting the duty cycle of the first switch Q1 and the second switch Q2, combined with the push-pull transformer, 220Vac high-frequency AC power is obtained. This AC power is rectified into pulsating DC power by the diode rectifier bridge and the capacitor. This DC power is then converted into power frequency AC power by the control circuit 300 to supply power to the vehicle's AC load.

[0199] In some embodiments, the controller 700 is further configured to, in charging mode, control the control circuit 300 to convert the AC power of the first power supply terminal 610 into DC power and charge the energy storage battery 100.

[0200] In this embodiment, when AC power is connected to the first power supply terminal 610, the AC power is converted into corresponding DC power by the control circuit 300 and output to both ends of the energy storage battery 100 via the first switching unit 431 to charge the energy storage battery 100. This allows the AC charging pile to directly charge the energy storage battery 100 via the control circuit 300 and the first switching unit 431, realizing independent charging of the energy storage battery 100 and improving the charging efficiency of the energy storage battery 100.

[0201] In some embodiments, the controller 700 is further configured to control the first battery pack B1 and the second battery pack B2 to perform power balancing via the control circuit 300 in a balancing mode, so as to reduce the power difference between the first battery pack B1 and the second battery pack B2.

[0202] In this embodiment, when the difference in charge level between the first battery pack B1 and the second battery pack B2 exceeds a first preset charge threshold, the controller 700 can control the second switching unit 432 to conduct. By controlling the duty cycle of the first switching unit 431, the inductor in the energy storage battery 100 multiplexing control circuit 300 is used to charge the battery pack with higher charge level from the first battery pack B1 to the battery pack with lower charge level, thereby achieving charge balance between the first battery pack B1 and the second battery pack B2. Furthermore, after a first preset rest period, the controller 700 again detects the difference in charge level between the first battery pack B1 and the second battery pack B2. If the difference in charge level between the first battery pack B1 and the second battery pack B2 is still greater than the first preset charge threshold, the controller again selects the battery pack with higher charge level to charge the battery pack with lower charge level until the difference in charge level between the first battery pack B1 and the second battery pack B2 is less than a second preset charge threshold. This second preset charge threshold is less than the first preset charge threshold, and the second preset charge threshold can be set to be less than 1% of the first battery pack B1.

[0203] In some embodiments, the energy storage battery 100 may be a sodium-ion battery, a lithium-ion battery, or a combination of sodium-ion batteries and lithium-ion batteries.

[0204] In some embodiments, the voltages at both ends of the first battery pack B1 and the second battery pack B2 are the same.

[0205] In some embodiments, the output voltage range of the first battery pack B1 and the second battery pack B2 is 12V-72V.

[0206] In some embodiments, the first battery pack B1 includes a 12V lithium-ion battery or sodium-ion battery, or other rechargeable battery.

[0207] In some embodiments, the first battery pack B1 includes a 24V lithium-ion battery or sodium-ion battery, or other rechargeable battery.

[0208] In some embodiments, the first battery pack B1 includes a 48V lithium-ion battery or sodium-ion battery, or other rechargeable battery.

[0209] In some embodiments, the first battery pack B1 includes a 72V lithium-ion battery or sodium-ion battery, or other rechargeable battery.

[0210] In this embodiment, the vehicle low-voltage battery architecture in this application embodiment can be applied to new energy vehicles or fuel vehicles, wherein the output voltage of the first battery pack B1 and the second battery pack B2 does not exceed 72V.

[0211] In some embodiments, the second battery pack B2 includes a 12V lithium-ion battery or sodium-ion battery, or other rechargeable batteries.

[0212] In some embodiments, the second battery pack B2 includes a 24V lithium-ion battery or sodium-ion battery, or other rechargeable battery.

[0213] In some embodiments, the second battery pack B2 includes a 48V lithium-ion battery or sodium-ion battery, or other rechargeable battery, and the output voltage of the second battery pack B2 is 48V.

[0214] In some embodiments, the second battery pack B2 includes a 72V lithium-ion battery or sodium-ion battery, or other rechargeable battery, and the output voltage of the second battery pack B2 does not exceed 72V.

[0215] This application provides a chassis including a battery-powered architecture as described in any of the above embodiments.

[0216] In this embodiment, by integrating the energy storage device described in any of the above embodiments into the vehicle chassis, the chassis can supply power to the functional loads and / or drive loads within the vehicle. The control circuit 300 is connected to the common node of the first battery pack B1 and the second battery pack B2 and the energy storage circuit 200. The controller 700 can control the control circuit 300 so that the first battery pack B1 and the second battery pack B2 charge each other through the energy storage circuit 200. The energy storage battery is heated by pulse self-heating, which not only reduces costs but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0217] This application provides a vehicle that includes an energy storage device as described in any of the above embodiments.

[0218] This application provides a vehicle including a chassis as described in the above embodiments.

[0219] In this embodiment, the vehicle can be an electric vehicle or a fuel vehicle. By setting an energy storage device on the vehicle, the control circuit 300 can be connected to the common node of the first battery pack B1 and the second battery pack B2 and the energy storage circuit 200. The controller 700 can control the control circuit 300 so that the first battery pack B1 and the second battery pack B2 can charge each other through the energy storage circuit 200. The energy storage battery is heated by pulse self-heating, which not only reduces the cost, but also helps to replace heating film heating or coolant heating, making the energy storage device simpler and facilitating the layout and simplification of the energy storage device.

[0220] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0221] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0222] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0223] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0224] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0225] 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An energy storage device, characterized in that, include: The energy storage battery includes a first battery pack and a second battery pack, wherein the first battery pack and the second battery pack are connected in series. Energy storage circuit; The control circuit is connected to the common node and energy storage circuit of the first battery pack and the second battery pack. The control circuit is controlled by the controller to control the first battery pack and the second battery pack to charge each other through the energy storage circuit.

2. The energy storage device according to claim 1, characterized in that, The energy storage device also includes: A voltage conversion circuit is connected to the energy storage battery and the first power supply terminal respectively, and is used to control the voltage conversion between the energy storage battery and the first power supply terminal; The control circuit includes at least one half-bridge in the voltage conversion circuit.

3. The energy storage device according to claim 2, characterized in that, The voltage conversion circuit is also used to convert the DC power provided by the energy storage battery into AC power and output it to the first power supply terminal.

4. The energy storage device according to claim 3, characterized in that, The voltage conversion circuit includes: A boost unit, connected to the energy storage battery, is used to convert the DC power output from the energy storage battery into AC power, and then boost the voltage before outputting it to at least one of the half-bridges.

5. The energy storage device according to claim 4, characterized in that, The voltage conversion circuit includes: A rectifier unit, connected between the boost unit and the control circuit, is used to convert the AC power output by the boost unit into DC power and output it to at least one of the half-bridges.

6. The energy storage device according to claim 2, characterized in that, The voltage conversion circuit is also used to convert the electrical energy provided by the first power supply terminal into a charging current to charge the energy storage battery.

7. The energy storage device according to claim 2, characterized in that, The voltage conversion circuit includes: The first half-bridge has its AC side connected to the first power supply terminal via the energy storage circuit.

8. The energy storage device according to claim 7, characterized in that, The control circuit includes the first half-bridge; The control circuit also includes: The first switching unit is connected between the energy storage battery and the DC side of the first half-bridge, and is used to control the connection status between the energy storage battery and the DC side of the first half-bridge. The second switching unit is connected between the common node of the first battery pack and the second battery pack and the first power supply terminal; The first switching unit, the second switching unit, and the first half-bridge are controlled by a controller to control the first battery pack and the second battery pack to charge each other through the energy storage circuit.

9. The energy storage device according to claim 7 or 8, characterized in that, The voltage conversion circuit further includes: The second half-bridge is connected in parallel with the first half-bridge.

10. The energy storage device according to claim 4, characterized in that, The boost unit includes: a first switching transistor, a second switching transistor, and a first transformer; The first end of the primary winding of the first transformer is connected to the negative terminal of the energy storage battery via the first switching transistor, the second end of the primary winding of the first transformer is connected to the negative terminal of the energy storage battery via the second switching transistor, and the center tap of the primary winding of the first transformer is connected to the positive terminal of the energy storage battery.

11. The energy storage device according to claim 7 or 8, characterized in that, The control circuit includes a first energy storage capacitor unit, the two ends of which are respectively connected to the DC positive bus and the DC negative bus of the control circuit.

12. The energy storage device according to claim 7 or 8, characterized in that, The control circuit further includes a second energy storage capacitor unit, the two ends of which are respectively connected to the first end and the second end of the first power supply terminal.

13. The energy storage device according to claim 8, characterized in that, The first switching unit includes: The first bus switch is connected between the DC positive bus of the control circuit and the positive terminal of the energy storage battery, and is controlled by the controller to turn on or off. The second bus switch is connected between the DC side negative bus of the control circuit and the negative terminal of the energy storage battery, and is controlled by the controller to turn on or off.

14. The energy storage device according to any one of claims 2-8, characterized in that, The energy storage circuit includes at least a portion of the energy storage devices in the voltage conversion circuit.

15. The energy storage device according to claim 14, characterized in that, The control circuit includes a first half-bridge and a second half-bridge, which are connected in parallel. The first end of the energy storage circuit is connected to the midpoint of the first half-bridge, and the second end of the energy storage circuit is connected to the midpoint of the second half-bridge.

16. The energy storage device according to claim 15, characterized in that, The voltage conversion circuit includes a first transformer; The energy storage circuit includes the winding of the first transformer, the first end of the primary winding of the first transformer is connected to the midpoint of the first half-bridge, and the second end of the primary winding of the first transformer is connected to the midpoint of the second half-bridge.

17. The energy storage device according to claim 15, characterized in that, The voltage conversion circuit includes an energy storage inductor; The energy storage circuit includes the energy storage inductor, with a first end connected to the midpoint of the first half-bridge and a second end connected to the midpoint of the second half-bridge.

18. The energy storage device according to claim 15, characterized in that, The energy storage circuit includes: An energy storage inductor is connected to the control circuit. The first end of the energy storage inductor is connected to the midpoint of the first half-bridge, and the second end of the energy storage inductor is connected to the midpoint of the second half-bridge. The energy storage battery charges the energy storage inductor through the control circuit.

19. The energy storage device according to claim 18, characterized in that, The energy storage circuit also includes an energy storage switch, which is connected in series with the energy storage inductor.

20. The energy storage device according to claim 7 or 8, characterized in that, The first end of the energy storage circuit is connected to the midpoint of the first half-bridge, and the second end of the energy storage circuit is connected to the common node of the first battery pack and the second battery pack.

21. The energy storage device according to claim 20, characterized in that, The voltage conversion circuit includes a first transformer; The energy storage circuit includes the winding of the first transformer. The first end of the primary winding of the first transformer is connected to the midpoint of the half-bridge of the first half-bridge, and the second end of the primary winding of the first transformer is connected to the common node of the first battery pack and the second battery pack.

22. The energy storage device according to claim 20, characterized in that, The voltage conversion circuit includes an energy storage inductor; The energy storage circuit includes the energy storage inductor, the first end of which is connected to the midpoint of the first half-bridge, and the second end of which is connected to the common node of the first battery pack and the second battery pack.

23. The energy storage device according to claim 20, characterized in that, The energy storage circuit includes: An energy storage inductor is connected to the control circuit. The first end of the energy storage inductor is connected to the midpoint of the first half-bridge, and the second end of the energy storage inductor is connected to the common node of the first battery pack and the second battery pack. The energy storage battery charges each other through the control circuit and the energy storage inductor.

24. The energy storage device according to claim 23, characterized in that, The energy storage circuit also includes an energy storage switch, which is connected in series with the energy storage inductor.

25. The energy storage device according to any one of claims 1-8, characterized in that, The energy storage device further includes a second power supply terminal connected to the energy storage battery, and a battery management circuit disposed between the second power supply terminal and the energy storage battery; The energy storage device is also used to control the energy storage battery to output DC power to the second power supply terminal via the battery management circuit in DC power supply mode.

26. The energy storage device according to claim 25, characterized in that, The battery management circuit and the control circuit are controlled by the same controller.

27. The energy storage device according to any one of claims 1-8, characterized in that, The controller is also configured to, in self-heating mode, control the first battery pack and the second battery pack to alternately generate pulse currents through the energy storage circuit so that the first battery pack and the second battery pack charge each other.

28. The energy storage device according to any one of claims 1-8, characterized in that, The controller is also used to control the energy storage battery to output AC power to the first power supply terminal via the control circuit in the first AC power supply mode.

29. The energy storage device according to any one of claims 2-4, characterized in that, The controller is also used to control the energy storage battery to output AC power to the first power supply terminal via the voltage conversion circuit and the control circuit in the second AC power supply mode.

30. The energy storage device according to any one of claims 1-6, characterized in that, The controller is also configured to, in charging mode, control the control circuit to convert the AC power at the first power supply terminal into DC power and charge the energy storage battery.

31. The energy storage device according to any one of claims 1-8, characterized in that, The controller is also used to control the first battery pack and the second battery pack to charge each other via the energy storage circuit in the equalization mode, so as to reduce the difference in charge between the first battery pack and the second battery pack.

32. A chassis, characterized in that, The chassis includes an energy storage device as described in any one of claims 1 to 31.

33. A vehicle, characterized in that, The vehicle includes an energy storage device as described in any one of claims 1 to 31; or includes a chassis as described in claim 32.

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