Battery arrangement, chassis and vehicle

Abstract

The application discloses a battery device, a chassis and a vehicle, wherein the controller can adjust the working parameters of the voltage conversion circuit according to the electric parameters of the first power supply end and the battery parameters of the low-voltage battery, if the voltage of the first power supply end leads to a large change in the case where the demand power changes, the voltage of the first power supply end can be adjusted by adjusting the working parameters of the voltage conversion circuit, if the charging voltage provided by the first power supply end does not match the voltage of the low-voltage battery, the working parameters of the voltage conversion circuit can be adjusted, the voltage matched with the voltage of the low-voltage battery is output to charge the low-voltage battery, and the application scenarios of the battery device are expanded and the stability of the battery device is improved.

Description

Technical Field

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

[0002] With the increasing power demands of intelligent new energy vehicles and their chassis systems, low-voltage systems need to provide 48V and 12V low-voltage power distribution. Low-voltage lithium batteries have a direct impact on vehicle performance. To improve the safety and lifespan of low-voltage lithium batteries, they are typically charged according to the lithium battery charging mapping strategy (MAP).

[0003] In related technologies, the battery pack is directly connected to the power supply terminal, and its charging current and charging voltage are affected by the electrical parameters of the power supply terminal. If a fixed current charging or a mismatched voltage charging is used, it will have a significant impact on the battery life and also pose safety hazards. Utility Model Content

[0004] In view of the above problems, this application provides a battery device, chassis and vehicle that can reduce the problem that the charging of the battery device is affected by the electrical parameters of the first power supply terminal.

[0005] The first aspect of this application provides a battery device, including:

[0006] Low-voltage batteries;

[0007] A voltage conversion circuit is connected to the low-voltage battery and the first power supply terminal.

[0008] A controller, connected to the voltage conversion circuit, is used to adjust the operating parameters of the voltage conversion circuit according to the electrical parameters of the first power supply terminal and the battery parameters of the low-voltage battery.

[0009] In the technical solution of this application embodiment, the voltage conversion circuit connects the low-voltage battery and the first power supply terminal, and can control the voltage conversion between the low-voltage battery and the first power supply terminal. The controller can adjust the operating parameters of the voltage conversion circuit according to the electrical parameters of the first power supply terminal and the battery parameters of the low-voltage battery to control the voltage of the first power supply terminal to be within a preset voltage range. If the voltage of the first power supply terminal changes significantly due to changes in the required power, the voltage of the first power supply terminal can be adjusted by adjusting the operating parameters of the voltage conversion circuit. If the charging voltage provided by the first power supply terminal does not match the voltage of the low-voltage battery, the operating parameters of the voltage conversion circuit can be adjusted to output a voltage that matches the voltage of the low-voltage battery to charge the low-voltage battery, thereby expanding the application scenarios of the battery device and improving the stability of the battery device.

[0010] In some embodiments, the battery device further includes:

[0011] The main switch circuit is connected to the low-voltage battery and the first power supply terminal, and is used to control the connection between the low-voltage battery and the first power supply terminal;

[0012] The controller is connected to the voltage conversion circuit and the main switch circuit, and is also used to adjust the operating parameters of the voltage conversion circuit and the main switch circuit according to the electrical parameters of the first power supply terminal and the battery parameters of the low-voltage battery.

[0013] In the technical solution of this application embodiment, the low-voltage battery can be connected to the first power supply terminal through a main switch circuit or through a voltage conversion circuit. During charging, if the charging voltage provided by the first power supply terminal matches the voltage of the low-voltage battery, the main switch circuit is turned on, and the first power supply terminal can directly charge the low-voltage battery. If the charging voltage provided by the first power supply terminal does not match the voltage of the low-voltage battery, the main switch circuit can be turned off, and the controller controls the voltage conversion circuit to convert the charging voltage provided by the first power supply terminal, outputting a voltage that matches the voltage of the low-voltage battery to charge the low-voltage battery. The operating parameters of the voltage conversion circuit are adjusted according to the electrical parameters of the first power supply terminal and the battery parameters of the low-voltage battery to reduce the influence of the electrical parameters of the first power supply terminal on the charging of the low-voltage battery.

[0014] In some embodiments, the controller is further configured to control the first power supply terminal to select one of the main switching circuit and the voltage conversion circuit to charge the low-voltage battery based on the electrical parameters of the first power supply terminal.

[0015] In the technical solution of this application embodiment, the controller can select one of the main switch circuit and the voltage conversion circuit to charge the low-voltage battery according to the electrical parameters of the first power supply terminal. If the charging voltage provided by the first power supply terminal matches the voltage of the low-voltage battery, the main switch circuit is turned on, and the first power supply terminal can directly charge the low-voltage battery. If the charging voltage provided by the first power supply terminal does not match the voltage of the low-voltage battery, the main switch circuit can be turned off, and the low-voltage battery is charged by the first power supply terminal through the voltage conversion circuit. This allows the battery device to be charged when different voltages are connected to the first power supply terminal, reducing the influence of the electrical parameters of the first power supply terminal on the charging of the low-voltage battery.

[0016] In some embodiments, the controller is further configured to control the switching frequency of the main switching circuit according to the electrical parameters of the first power supply terminal and the battery parameters of the low-voltage battery, so as to adjust the electrical parameters of the first power supply terminal charging the low-voltage battery through the main switching circuit.

[0017] In the technical solution of this application embodiment, the battery parameters of the first power supply terminal may include the electrical parameters, current, and charging power of the first power supply terminal, and the battery parameters of the low-voltage battery may include the voltage, SOC, and other parameters of the low-voltage battery. The controller can adjust the switching frequency of the main switch circuit according to the battery parameters of the first power supply terminal and the low-voltage battery, thereby adjusting the electrical parameters of the first power supply terminal charging the low-voltage battery through the main switch circuit, so that the charging current can be adjusted at any time according to the changes in the battery parameters of the low-voltage battery, which is beneficial to extending the life of the low-voltage battery and improving the charging safety of the battery device.

[0018] In some embodiments, the controller is further configured to control the operating parameters of the voltage conversion circuit according to the battery parameters of the low-voltage battery and the electrical parameters of the first power supply terminal, so as to adjust the electrical parameters of the first power supply terminal charging the low-voltage battery through the voltage conversion circuit.

[0019] In the technical solution of this application embodiment, the battery parameters of the first power supply terminal may include the electrical parameters, current, and charging power of the first power supply terminal. The battery parameters of the low-voltage battery include the voltage, SOC, and other parameters of the low-voltage battery. If the charging voltage provided by the first power supply terminal matches the voltage of the low-voltage battery, the main switch circuit is turned on, and the first power supply terminal can directly charge the low-voltage battery. If the charging voltage provided by the first power supply terminal does not match the voltage of the low-voltage battery, the main switch circuit can be turned off, and the low-voltage battery is charged by the first power supply terminal through the voltage conversion circuit. This allows the battery device to be charged when different voltages are applied to the first power supply terminal, reducing the influence of the electrical parameters of the first power supply terminal on the charging of the low-voltage battery. The controller can adjust the operating parameters of the voltage conversion circuit according to the battery parameters of the first power supply terminal and the low-voltage battery, thereby adjusting the electrical parameters of the first power supply terminal charging the low-voltage battery through the voltage conversion circuit. This allows the charging current to be adjusted in real time according to the changes in the battery parameters of the low-voltage battery, which is beneficial to extending the life of the low-voltage battery and improving the charging safety of the battery device.

[0020] In some embodiments, the controller is further configured to control the low-voltage battery to select one of the main switching circuit and the voltage conversion circuit to supply power to the first power supply terminal based on the electrical parameters of the first power supply terminal.

[0021] In the technical solution of this application embodiment, the voltage conversion circuit has a bidirectional voltage conversion function. For example, it can convert the electrical parameters of the first power supply terminal into a charging voltage to charge the low-voltage battery, or it can convert the voltage of the low-voltage battery into a discharging voltage to supply power to the first power supply terminal. The electrical parameters of the first power supply terminal include the required voltage. Under discharge conditions, when the difference between the required voltage of the first power supply terminal and the voltage of the low-voltage battery is small, the main switch circuit is turned on, and the low-voltage battery can directly supply its voltage to the first power supply terminal. When the difference between the required voltage of the first power supply terminal and the voltage of the low-voltage battery is large, the voltage supplied by the low-voltage battery can be stepped down or stepped up by the voltage conversion circuit, so that the voltage output by the voltage conversion circuit is consistent with the required voltage of the first power supply terminal, thereby expanding the application range of the battery device power supply.

[0022] In some embodiments, the controller is further configured to control the switching frequency of the main switching circuit according to the battery parameters of the low-voltage battery and the electrical parameters of the first power supply terminal, so as to adjust the discharge parameters of the low-voltage battery discharging to the first power supply terminal through the main switching circuit.

[0023] In the technical solution of this application embodiment, the electrical parameters of the first power supply terminal include the required voltage. Under discharge conditions, when the difference between the required voltage of the first power supply terminal and the voltage of the low-voltage battery is small, the main switch circuit is turned on, and the low-voltage battery can directly supply its voltage to the first power supply terminal. The controller can adjust the discharge current of the low-voltage battery by controlling the switching frequency of the main switch circuit, so that the discharge current can be adjusted according to the battery parameters of the low-voltage battery. This allows the discharge current to be adjusted at any time according to the changes in the battery parameters of the low-voltage battery, which can reduce the risk of over-discharge of the low-voltage battery and help extend the life of the low-voltage battery. Furthermore, the controller can also adjust the discharge current according to the electrical parameters of the first power supply terminal, which helps to improve the discharge safety of the battery device.

[0024] In some embodiments, the controller is further configured to control the operating parameters of the voltage conversion circuit according to the battery parameters of the low-voltage battery and the electrical parameters of the first power supply terminal, so as to adjust the discharge parameters of the low-voltage battery discharging to the first power supply terminal through the voltage conversion circuit.

[0025] In the technical solution of this application embodiment, the electrical parameters of the first power supply terminal include the required voltage. When the difference between the required voltage of the first power supply terminal and the voltage of the low-voltage battery is large, the voltage provided by the low-voltage battery can be stepped down or stepped up by a voltage conversion circuit, so that the voltage output by the voltage conversion circuit is consistent with the required voltage of the first power supply terminal, thereby expanding the application range of the battery device. Furthermore, the operating parameters of the voltage conversion circuit can be adjusted according to the battery parameters of the low-voltage battery, so that the discharge power of the first power supply terminal needs to be adjusted according to the battery parameters of the low-voltage battery. In this way, the risk of over-discharge of the low-voltage battery can be reduced, which is beneficial to extending the life of the low-voltage battery. In addition, the controller can also adjust the discharge current according to the electrical parameters of the first power supply terminal, which is beneficial to improving the discharge safety of the battery device.

[0026] In some embodiments, the voltage conversion circuit includes a first switching transistor, a second switching transistor, and a first inductor; the first end of the first switching transistor is connected to the positive terminal of the first power supply terminal, the second end of the first switching transistor and the first end of the second switching transistor are both connected to the first end of the first inductor, the second end of the first inductor and the first end of the second capacitor are both connected to the positive terminal of the low-voltage battery, and the second end of the second switching transistor is grounded.

[0027] In some embodiments, the voltage conversion circuit further includes a second capacitor, the first terminal of which is connected to the positive terminal of the low-voltage battery, and the second terminal of which is grounded.

[0028] In some embodiments, the voltage conversion circuit further includes a first diode, the anode of which is connected to the second terminal of the second switching transistor, and the cathode of which is connected to the first terminal of the second switching transistor.

[0029] In some embodiments, the battery device includes a buffer capacitor, the two ends of which are respectively connected to the positive and negative terminals of the first power supply terminal.

[0030] In some embodiments, the battery device further includes:

[0031] The control circuit is connected to the low-voltage battery;

[0032] An energy storage circuit is connected to both the low-voltage battery and the control circuit.

[0033] The control circuit is controlled by the controller to control the low-voltage battery and the energy storage circuit to charge each other.

[0034] In the technical solution of this application embodiment, by setting an energy storage circuit to be connected to the low-voltage battery and the control circuit respectively, the control circuit controls the low-voltage battery and the energy storage circuit to charge each other, and the low-voltage 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.

[0035] In some embodiments, the battery device further includes:

[0036] A control switch is connected between the control circuit and the low-voltage battery and is controlled by the controller to control the connection between the control circuit and the low-voltage battery.

[0037] In some embodiments, the energy storage circuit includes at least a portion of the energy storage devices in the voltage conversion circuit.

[0038] In the technical solution of this application embodiment, by reusing at least a portion of the energy storage devices in the voltage conversion circuit, it is possible to eliminate the need for additional energy storage devices, thereby saving the cost of the battery device. The low-voltage battery and at least a portion of the energy storage devices in the voltage conversion circuit are mutually charged by the control circuit. The low-voltage 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.

[0039] In some embodiments, the voltage conversion circuit is connected to the control circuit, and the voltage conversion circuit is used to perform voltage conversion processing on the input voltage.

[0040] In some embodiments, the control circuit is further configured to be controlled by the controller to convert the DC power provided by the low-voltage battery into AC power and output it to the voltage conversion circuit.

[0041] In the technical solution of this application embodiment, the control circuit can convert the DC power provided by the low-voltage battery into AC power and output it to the voltage conversion circuit, thereby providing AC power to the outside. Furthermore, by reusing at least a portion of the energy storage devices in the voltage conversion circuit, the cost of the battery device can be saved. The control circuit controls the low-voltage battery and at least a portion of the energy storage devices in the voltage conversion circuit to charge each other. Pulse self-heating can be used to heat the low-voltage battery, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0042] In some embodiments, the voltage conversion circuit is further configured to be controlled by the controller to convert the AC power provided by the control circuit into voltage and then output it to the first power supply terminal.

[0043] In the technical solution of this application embodiment, the control circuit can convert the DC power provided by the low-voltage battery into AC power and output it to the voltage conversion circuit, thereby providing AC power to the outside world. The voltage conversion circuit performs voltage conversion on the AC power provided by the control circuit. Furthermore, by reusing at least a portion of the energy storage devices in the voltage conversion circuit, the cost of the battery device can be saved. The control circuit controls the low-voltage battery and at least a portion of the energy storage devices in the voltage conversion circuit to charge each other. Pulse self-heating can be used to heat the low-voltage battery, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0044] 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;

[0045] 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.

[0046] In the technical solution of this application embodiment, 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. By controlling the switching state of the first half-bridge and the second half-bridge, the DC power provided by the low-voltage battery can charge the energy storage circuit. Then, by controlling the switching state of the first half-bridge and the second half-bridge, the energy storage circuit can charge the low-voltage battery. This allows the low-voltage battery to 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.

[0047] In some embodiments, the voltage conversion circuit includes a first transformer;

[0048] 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.

[0049] 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 device. The low-voltage battery and the winding of the first transformer are mutually charged by the control circuit. The low-voltage 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.

[0050] In some embodiments, the voltage conversion circuit includes an energy storage inductor;

[0051] 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.

[0052] 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 device. The low-voltage battery and the energy storage inductor are mutually charged by the control circuit. The low-voltage 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.

[0053] In some embodiments, the energy storage circuit includes:

[0054] 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 low-voltage battery charges each other through the control circuit and the energy storage inductor.

[0055] 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 low-voltage battery and the energy storage inductor to charge each other. The low-voltage 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.

[0056] In some embodiments, the energy storage circuit further includes an energy storage switch, which is connected in series with the energy storage inductor.

[0057] 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 low-voltage battery. When the low-voltage battery does not need self-heating, the energy storage switch is controlled to be turned off. When the voltage conversion circuit is working, the control circuit can also control the low-voltage battery and the energy storage inductor to charge each other. The low-voltage 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.

[0058] In some embodiments, the low-voltage 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;

[0059] The battery device also includes:

[0060] The control circuit, controlled by the controller, is used to control the first battery pack and the second battery pack to charge each other through the energy storage circuit.

[0061] In the technical solution of this application embodiment, by controlling the state of the control circuit, during the low-voltage battery discharge stage, the first battery pack charges and stores energy in the energy storage circuit via the control circuit. Then, during the low-voltage battery charging stage, the energy storage circuit charges the second battery pack via the control circuit. Then, by controlling the state of the control circuit, during the low-voltage battery discharge stage, the second battery pack charges and stores energy in the energy storage circuit via the control circuit. During the low-voltage battery charging stage, the energy storage circuit charges the first battery pack via the control circuit. This allows the first and second battery packs in the low-voltage battery to charge each other via the energy storage circuit, thereby heating the low-voltage battery using pulse self-heating instead of heating film heating or coolant heating. This simplifies the battery device and facilitates the arrangement and simplification of the battery system.

[0062] In some embodiments, the control circuit includes a first half-bridge;

[0063] 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.

[0064] In the technical solution of this application embodiment, by controlling the state of the first half-bridge, during the low-voltage battery discharge stage, the first battery pack charges and stores energy in the energy storage circuit through the first half-bridge. Then, during the low-voltage 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 low-voltage battery discharge stage, the second battery pack charges and stores energy in the energy storage circuit through the first half-bridge. During the low-voltage 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 low-voltage battery to charge each other through the energy storage circuit, thereby heating the low-voltage 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 battery system.

[0065] In some embodiments, the voltage conversion circuit includes a first transformer;

[0066] 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.

[0067] In the technical solution of this application embodiment, the winding of the first transformer in the voltage conversion circuit is reused as the energy storage device in the energy storage circuit. The first end of the winding of the first transformer in the voltage conversion circuit is connected to the midpoint of the first half-bridge, and the second end of the winding of the first transformer in the voltage conversion circuit is connected to the common node of the first battery pack and the second battery pack. In the self-heating mode, the low-voltage battery is in alternating discharge and charging conditions. During the low-voltage battery discharge stage, by controlling the state of the first half-bridge, the first battery pack charges and stores energy through the first half-bridge to the winding of the first transformer in the voltage conversion circuit. Then, during the low-voltage battery charging stage, the energy is stored by the winding of the first transformer in the voltage conversion circuit. The windings of the first transformer charge the second battery pack via the first half-bridge. Then, the state of the first half-bridge is controlled. During the low-voltage battery discharge phase, the second battery pack charges and stores energy through the windings of the first transformer in the voltage conversion circuit via the first half-bridge. During the low-voltage battery charging phase, the windings of the first transformer in the voltage conversion circuit charge the first battery pack via the first half-bridge. This allows the first and second battery packs in the low-voltage battery to charge each other through the windings of the first transformer in the voltage conversion circuit. This uses pulse self-heating to heat the low-voltage battery, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0068] In some embodiments, the voltage conversion circuit includes an energy storage inductor;

[0069] 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.

[0070] 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 low-voltage battery discharge stage, 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 low-voltage battery charging stage, 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 low-voltage battery discharge stage, 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 low-voltage battery charging stage, 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 low-voltage battery to charge each other through the energy storage inductor in the voltage conversion circuit. This uses pulse self-heating to heat the low-voltage battery, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0071] In some embodiments, the energy storage circuit includes:

[0072] 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 low-voltage battery charges each other through the control circuit and the energy storage inductor.

[0073] 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 low-voltage battery to charge each other through the energy storage inductor, thereby heating the low-voltage 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 battery system.

[0074] In some embodiments, the energy storage circuit further includes an energy storage switch, which is connected in series with the energy storage inductor.

[0075] 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 low-voltage battery. When the low-voltage battery does not need self-heating, 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 low-voltage battery are controlled to charge each other through the energy storage inductor, thereby heating the low-voltage 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 battery system.

[0076] In some embodiments, the control circuit further includes a first half-bridge and a second half-bridge;

[0077] 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.

[0078] In the technical solution of this application embodiment, the control circuit further includes a first half-bridge and a second half-bridge. 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 first battery pack and the second battery pack in the low-voltage battery are controlled to charge each other with the energy storage circuit through the first half-bridge and the second half-bridge, thereby heating the low-voltage 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 battery system.

[0079] In some embodiments, the energy storage circuit further includes:

[0080] Energy storage inductor, wherein the energy storage inductor is a common-mode inductor;

[0081] The control circuit also includes a first half-bridge and a second half-bridge;

[0082] The first end of the common-mode inductor is connected to the midpoint of the first half-bridge, the second end of the common-mode inductor is connected to the midpoint of the second half-bridge, and the third and fourth ends of the common-mode inductor are connected to the common node of the first battery pack and the second battery pack.

[0083] In the technical solution of this application embodiment, the control circuit further includes a first half-bridge and a second half-bridge. By setting the first end of the common-mode inductor to be connected to the midpoint of the first half-bridge, the second end of the common-mode inductor to be connected to the midpoint of the second half-bridge, and the third and fourth ends of the common-mode inductor to be connected to the common node of the first battery pack and the second battery pack, the first battery pack and the second battery pack in the low-voltage battery are controlled to charge each other through the first half-bridge and the second half-bridge, thereby heating the low-voltage 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 battery system.

[0084] In some embodiments, the voltage conversion circuit further includes:

[0085] The first rectifier-inverter unit is connected to the first transformer and is used to convert the AC power output by the first transformer into DC power.

[0086] In the technical solution of this application embodiment, a first rectifier-inverter unit is set in the secondary winding of the first transformer. The first rectifier-inverter unit converts the AC power output from the first transformer into DC power and outputs it to the first power supply terminal. If the charging voltage provided by the first power supply terminal matches the voltage of the low-voltage battery, the main switch circuit is turned on, and the first power supply terminal can directly charge the low-voltage battery. If the charging voltage provided by the first power supply terminal does not match the voltage of the low-voltage battery, the main switch circuit can be turned off, and the low-voltage battery is charged by the first power supply terminal through the voltage conversion circuit. This allows the battery device to be charged when different voltages are connected to the first power supply terminal, reducing the influence of the electrical parameters of the first power supply terminal on the charging of the low-voltage battery.

[0087] In some embodiments, a second rectifier-inverter unit is connected between the first rectifier-inverter unit and the first power supply terminal to convert the direct current into alternating current and output it to the first power supply terminal.

[0088] In the technical solution of this application embodiment, by setting a first rectifier-inverter unit and a second rectifier-inverter unit on the secondary winding of the first transformer, the first rectifier-inverter unit can convert the AC power output by the first transformer into DC power, and the second rectifier-inverter unit can convert the DC power into AC power and output it to the first power supply terminal, so that the first power supply terminal provides AC power to the outside, which is beneficial to maintaining the voltage stability of the first power supply terminal.

[0089] 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.

[0090] 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 operates in a balancing mode. The controller can control the bridge arm in the control circuit to operate in a corresponding switching state, allowing the battery pack with higher charge level to charge the battery pack with lower charge level, thereby achieving charge balance between the first and second battery packs. Furthermore, after the bridge arm in the control circuit is in an open state and remains stationary for a first preset time, the controller again detects the charge difference between the first and second battery packs. If the charge difference 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 charge difference 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.

[0091] In some embodiments, the controller is further configured to control the low-voltage battery and the energy storage circuit to charge each other in a first self-heating mode.

[0092] In the technical solution of this application embodiment, when the temperature of the low-voltage battery is low, the battery device can be controlled to work in the first self-heating mode, and the low-voltage battery and the energy storage circuit can be controlled to charge each other so that the low-voltage battery can be self-heated. The low-voltage battery is charged by pulse self-heating, which not only reduces the cost, but also has a smaller 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 battery system.

[0093] In some embodiments, the controller is further configured to control the first battery pack and the second battery pack to charge each other in a second self-heating mode.

[0094] In the technical solution of this application embodiment, when the temperature of the low-voltage battery is less than the first preset temperature threshold, the controller can operate in the second self-heating mode, so that the low-voltage battery can be connected to the energy storage circuit through the control circuit, and the first battery pack and the second battery pack can be controlled to alternately output pulse current to charge the low-voltage battery by pulse self-heating. This not only reduces the cost, but also has a smaller 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 structure of the battery device simpler and facilitating the layout and simplification of the battery system.

[0095] In some embodiments, the controller is further configured to, in AC charging mode, control the voltage conversion circuit to convert the AC power from the first power supply terminal to DC power and charge the low-voltage battery.

[0096] In the technical solution of this application embodiment, when AC power is connected to the first power supply terminal, AC and DC conversion can be realized through the voltage conversion circuit. The voltage conversion circuit converts the AC power provided by the first power supply terminal into DC power to charge the low-voltage battery, so that the AC charging pile can directly charge the battery device, which facilitates the independent charging of the battery device in the vehicle and expands the application of the battery device in new energy vehicles and fuel vehicles.

[0097] In some embodiments, the controller is further configured to, in AC power supply mode, control the voltage conversion circuit to convert the DC power supplied by the low-voltage battery into AC power to supply power to the first power supply terminal.

[0098] In the technical solution of this application embodiment, when the AC load is connected to the first power supply terminal, the controller operates in AC power supply mode. The voltage conversion circuit converts the DC power output from the low-voltage battery into AC power output to the first power supply terminal, so that the low-voltage battery can realize AC power supply for the vehicle through the voltage conversion circuit. This can reduce the hidden danger of the power battery pack in the new energy vehicle providing AC power to the vehicle interior and affecting the vehicle's power output. It can also provide AC power to the vehicle in the fuel vehicle, expanding the application of battery devices in both new energy vehicles and fuel vehicles.

[0099] A second aspect of this application provides a chassis including a battery device as described in any of the preceding embodiments.

[0100] A third aspect of this application provides a vehicle that includes a battery device as described in any of the above embodiments; or includes a chassis as described in the above embodiments.

[0101] In the technical solution of this application embodiment, a battery device is installed in the vehicle. The controller can adjust the operating parameters of the voltage conversion circuit according to the electrical parameters of the first power supply terminal and the battery parameters of the low-voltage battery. If the voltage of the first power supply terminal changes significantly due to changes in the required power, the voltage of the first power supply terminal can be adjusted by adjusting the operating parameters of the voltage conversion circuit. If the charging voltage provided by the first power supply terminal does not match the voltage of the low-voltage battery, the operating parameters of the voltage conversion circuit can be adjusted to output a voltage that matches the voltage of the low-voltage battery to charge the low-voltage battery, thereby expanding the application scenarios of the battery device and improving the stability of the battery device.

[0102] 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, the following are specific embodiments of this application. Attached Figure Description

[0103] 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:

[0104] Figure 1 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0105] Figure 2 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0106] Figure 3 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0107] Figure 4 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0108] Figure 5 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0109] Figure 6 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0110] Figure 7 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0111] Figure 8 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0112] Figure 9 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0113] Figure 10 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0114] Figure 11 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0115] Figure 12 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0116] Figure 13 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0117] Figure 14 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0118] Figure 15 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0119] Figure 16 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0120] Figure 17 This is a schematic diagram of one possible structure of the battery device provided in the embodiments of this application;

[0121] Figure 18 This is a schematic diagram of one structure of the battery device provided in the embodiments of this application. Detailed Implementation

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] In the description of the embodiments of this application, the term "multiple frames" refers to two or more (including two).

[0128] 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.

[0129] In related technologies, the battery pack is directly connected to the power supply terminal, and its charging current and charging voltage are affected by the electrical parameters of the power supply terminal. If a fixed current charging or a mismatched voltage charging is used, it will have a significant impact on the battery life and also pose safety hazards.

[0130] This application provides a battery device, see [link to relevant documentation]. Figure 1As shown, the battery device in this embodiment includes: a low-voltage battery 100, a voltage conversion circuit 400, and a controller 700. The voltage conversion circuit 400 is connected to the low-voltage battery 100 and the first power supply terminal 610. The voltage conversion circuit 400 converts the output voltage of the low-voltage battery 100 into a power supply voltage and outputs it through the first power supply terminal 610, or converts the voltage input to the first power supply terminal 610 into a charging voltage to charge the low-voltage battery 100. The controller 700 is connected to the voltage conversion circuit 400 and is used to adjust the operating parameters of the voltage conversion circuit 400 according to the electrical parameters of the first power supply terminal 610 and the battery parameters of the low-voltage battery 100.

[0131] In this embodiment, the voltage conversion circuit 400 is connected to the low-voltage battery 100 and the first power supply terminal 610. The controller 700 can adjust the operating parameters of the voltage conversion circuit 400 according to the electrical parameters of the first power supply terminal 610 and the battery parameters of the low-voltage battery 100. If the voltage of the first power supply terminal 610 changes significantly due to changes in the required power, the voltage of the first power supply terminal 610 can be adjusted by adjusting the operating parameters of the voltage conversion circuit 400. If the charging voltage provided by the first power supply terminal 610 does not match the voltage of the low-voltage battery 100, the operating parameters of the voltage conversion circuit 400 can be adjusted to output a voltage that matches the voltage of the low-voltage battery 100 to charge the low-voltage battery 100, thereby expanding the application scenarios of the battery device and improving the stability of the battery device.

[0132] In some embodiments, the voltage conversion circuit 400 may include at least one of a half-bridge, a transformer, and an energy storage device. The half-bridge can realize the conversion between DC and AC, or the half-bridge can be combined with the energy storage device to realize voltage conversion. The half-bridge can also be combined with the transformer to realize the step-up and step-down regulation of the low-voltage battery 100.

[0133] In this embodiment, the electrical parameters of the first power supply terminal 610 include voltage and current. By integrating the low-voltage battery 100 and the voltage conversion circuit 400 into the battery device, the overall installation and adjustment of the battery device can be facilitated without the need for additional peripheral circuits or devices based on the application scenario. This has the advantages of simple installation and structure. For example, when the battery device is installed in a vehicle, the low-voltage battery 100 needs to be charged according to the charging MAP of the lithium battery. Otherwise, it will affect the battery life and may even generate lithium dendrites in severe cases, posing a safety hazard. Traditional generators cannot achieve real-time adjustment according to the charging MAP, and the output current closed-loop cycle of the DC-DC converter is relatively long, posing a risk of overcharging. By integrating the voltage conversion circuit 400 into the battery device, the charging voltage and charging current of the low-voltage battery 100 can be adaptively adjusted according to the electrical parameters of the first power supply terminal 610.

[0134] In some embodiments, the voltage conversion circuit 400 includes at least one half-bridge. The operating parameters of the voltage conversion circuit 400 include the switching duty cycle of the half-bridge. The controller 700 can control the buck-boost ratio of the voltage conversion circuit 400 by controlling the switching duty cycle of the half-bridge, and can also control the rectification and inversion operating states of the half-bridge.

[0135] In some embodiments, the voltage conversion circuit 400 includes at least one half-bridge and an inductor. The midpoint of the half-bridge is connected to the positive terminal of the low-voltage battery 100 via the inductor. By controlling the switching duty cycle of the half-bridge, the step-up / step-down ratio of the voltage conversion circuit 400 can be controlled.

[0136] In some embodiments, the voltage conversion circuit 400 includes at least one half-bridge and a transformer, with one winding of the half-bridge and the transformer connected in series. By controlling the switching duty cycle of the half-bridge, the step-up / step-down ratio of the voltage conversion circuit 400 can be controlled.

[0137] In some embodiments, see Figure 2 As shown, the battery device in this embodiment further includes: a main switch circuit 710, which is connected to the low-voltage battery 100 and the first power supply terminal 610, and is used to control the connection relationship between the low-voltage battery 100 and the first power supply terminal 610; and a controller 700, which is connected to the voltage conversion circuit 400 and the main switch circuit 710, and is used to adjust the operating parameters of the voltage conversion circuit 400 and the main switch circuit 710 according to the electrical parameters of the first power supply terminal 610 and the battery parameters of the low-voltage battery 100.

[0138] In this embodiment, the low-voltage battery 100 can be connected to the first power supply terminal 610 via a main switch circuit 710 or via a voltage conversion circuit 400. During charging, if the charging voltage provided by the first power supply terminal 610 matches the voltage of the low-voltage battery 100, the main switch circuit 710 is turned on, and the first power supply terminal 610 can directly charge the low-voltage battery 100. If the charging voltage provided by the first power supply terminal 610 does not match the voltage of the low-voltage battery 100, the main switch circuit 710 can be turned off, and the controller 700 controls the voltage conversion circuit 400 to convert the charging voltage provided by the first power supply terminal 610, outputting a voltage that matches the voltage of the low-voltage battery 100 for charging. The controller 700 also adjusts the operating parameters of the voltage conversion circuit 400 according to the electrical parameters of the first power supply terminal 610 and the battery parameters of the low-voltage battery 100, reducing the influence of the voltage of the first power supply terminal 610 on the charging of the low-voltage battery 100.

[0139] In some embodiments, the electrical parameters of the first power supply terminal 610 include at least one of the charging voltage, charging current, and charging power of the first power supply terminal 610.

[0140] In some embodiments, the first power supply terminal 610 is connected to DC power. If the voltage of the DC power matches the voltage of the low-voltage battery 100, the low-voltage battery 100 can be directly charged by the main switch circuit 710.

[0141] In some embodiments, the AC power connected to the first power supply terminal 610 can be converted into DC power by the voltage conversion circuit 400. The voltage of the DC power is matched to that of the low-voltage battery 100 to charge the low-voltage battery 100.

[0142] In some embodiments, the voltage matched to the voltage of the low-voltage battery 100 may be a first preset voltage, which may be determined based on the battery parameters of the low-voltage battery 100. For example, the first preset voltage may be 1.1 to 1.2 times the nominal voltage of the low-voltage battery 100.

[0143] In some embodiments, the battery parameters of the low-voltage battery 100 include at least one of the following: battery model, battery voltage, battery capacity, internal resistance, state of charge (SOC), and state of health (SOH).

[0144] In some embodiments, the controller 700 is further configured to control the first power supply terminal 610 to select one of the power supply circuits of the main switch circuit 710 and the voltage conversion circuit 400 to charge the low-voltage battery 100 based on the voltage of the first power supply terminal 610.

[0145] In this embodiment, the controller 700 can select one of the main switch circuit 710 and the voltage conversion circuit 400 to charge the low-voltage battery 100 based on the voltage of the first power supply terminal 610. If the charging voltage provided by the first power supply terminal 610 matches the voltage of the low-voltage battery 100, the main switch circuit 710 is turned on, and the first power supply terminal 610 can directly charge the low-voltage battery 100. If the charging voltage provided by the first power supply terminal 610 does not match the voltage of the low-voltage battery 100, the main switch circuit 710 can be turned off, and the low-voltage battery 100 is charged by the first power supply terminal 610 through the voltage conversion circuit 400. This allows the battery device to be charged when different voltages are applied to the first power supply terminal 610, reducing the influence of the voltage of the first power supply terminal 610 on the charging of the low-voltage battery 100.

[0146] In some embodiments, the controller 700 is further configured to control the switching frequency of the main switch circuit 710 according to the electrical parameters of the first power supply terminal 610 and the battery parameters of the low-voltage battery 100, so as to adjust the electrical parameters of the first power supply terminal 610 charging the low-voltage battery 100 through the main switch circuit 710.

[0147] In this embodiment, the electrical parameters of the first power supply terminal 610 may include the voltage, current, and charging power of the first power supply terminal 610, and the battery parameters of the low-voltage battery 100 may include the voltage, SOC, and other parameters of the low-voltage battery 100. The controller 700 can adjust the switching frequency of the main switch circuit 710 according to the battery parameters of the first power supply terminal 610 and the low-voltage battery 100, thereby adjusting the electrical parameters of the first power supply terminal 610 charging the low-voltage battery 100 through the main switch circuit 710. This allows the charging current to be adjusted at any time according to the changes in the battery parameters of the low-voltage battery 100, which is beneficial to extending the life of the low-voltage battery 100 and improving the charging safety of the battery device.

[0148] In some embodiments, the controller 700 is further configured to control the operating parameters of the voltage conversion circuit 400 according to the battery parameters of the low-voltage battery 100 and the electrical parameters of the first power supply terminal 610, so as to adjust the electrical parameters of the first power supply terminal 610 charging the low-voltage battery 100 through the voltage conversion circuit 400.

[0149] In this embodiment, the electrical parameters of the first power supply terminal 610 may include the voltage, current, and charging power of the first power supply terminal 610, and the battery parameters of the low-voltage battery 100 may include the voltage, SOC, and other parameters of the low-voltage battery 100. If the charging voltage provided by the first power supply terminal 610 matches the voltage of the low-voltage battery 100, the main switch circuit 710 is turned on, and the first power supply terminal 610 can directly charge the low-voltage battery 100. If the charging voltage provided by the first power supply terminal 610 does not match the voltage of the low-voltage battery 100, the main switch circuit 710 can be turned off, and the low-voltage battery 100 is charged by the first power supply terminal 610 through the voltage conversion circuit 400. This allows the battery device to be charged when different voltages are connected to the first power supply terminal 610, reducing the influence of the voltage of the first power supply terminal 610 on the charging of the low-voltage battery 100. The controller 700 can adjust the operating parameters of the voltage conversion circuit 400 according to the battery parameters of the first power supply terminal 610 and the low-voltage battery 100, thereby adjusting the electrical parameters of the first power supply terminal 610 charging the low-voltage battery 100 through the voltage conversion circuit 400. This allows the charging current to be adjusted in real time according to the changes in the battery parameters of the low-voltage battery 100, which is beneficial to extending the life of the low-voltage battery 100 and improving the charging safety of the battery device.

[0150] In some embodiments, the controller 700 is further configured to control the low-voltage battery 100 to select one of the power supply circuits of the main switch circuit 710 and the voltage conversion circuit 400 to supply power to the first power supply terminal 610 according to the electrical parameters of the first power supply terminal 610.

[0151] In this embodiment, the voltage conversion circuit 400 has a bidirectional voltage conversion function. For example, it can convert the voltage of the first power supply terminal 610 into a charging voltage to charge the low-voltage battery 100, or it can convert the voltage of the low-voltage battery 100 into a discharging voltage to supply power to the first power supply terminal 610. The electrical parameters of the first power supply terminal 610 include the required voltage. Under discharge conditions, when the difference between the required voltage of the first power supply terminal 610 and the voltage of the low-voltage battery 100 is small, the main switch circuit 710 is turned on, and the low-voltage battery 100 can directly supply its voltage to the first power supply terminal 610. When the difference between the required voltage of the first power supply terminal 610 and the voltage of the low-voltage battery 100 is large, the voltage conversion circuit 400 can step down or step up the voltage supplied by the low-voltage battery 100, so that the voltage output by the voltage conversion circuit 400 is consistent with the required voltage of the first power supply terminal 610, thereby expanding the application range of the battery device.

[0152] In some embodiments, the controller 700 is further configured to control the switching frequency of the main switch circuit 710 according to the battery parameters of the low-voltage battery 100 and the electrical parameters of the first power supply terminal 610, so as to adjust the discharge parameters of the low-voltage battery 100 discharging to the first power supply terminal 610 through the main switch circuit 710.

[0153] In this embodiment, the electrical parameters of the first power supply terminal 610 include the required voltage. Under discharge conditions, when the difference between the required voltage of the first power supply terminal 610 and the voltage of the low-voltage battery 100 is small, the main switch circuit 710 is turned on, and the low-voltage battery 100 can directly supply its voltage to the first power supply terminal 610. The controller 700 can adjust the discharge current of the low-voltage battery 100 by controlling the switching frequency of the main switch circuit 710, so that the discharge current can be adjusted according to the battery parameters of the low-voltage battery 100. This allows the discharge current to be adjusted at any time according to the changes in the battery parameters of the low-voltage battery 100, which can reduce the risk of over-discharge of the low-voltage battery 100 and help extend the life of the low-voltage battery 100. Furthermore, the controller 700 can also adjust the discharge current according to the electrical parameters of the first power supply terminal 610, which helps to improve the discharge safety of the battery device.

[0154] In some embodiments, the controller 700 is further configured to control the operating parameters of the voltage conversion circuit 400 according to the battery parameters of the low-voltage battery 100 and the electrical parameters of the first power supply terminal 610, so as to adjust the discharge parameters of the low-voltage battery 100 discharging to the first power supply terminal 610 through the voltage conversion circuit 400.

[0155] In this embodiment, the electrical parameters of the first power supply terminal 610 include the required voltage. When the difference between the required voltage of the first power supply terminal 610 and the voltage of the low-voltage battery 100 is large, the voltage conversion circuit 400 can step down or step up the voltage provided by the low-voltage battery 100 to control the voltage of the first power supply terminal 610 to remain within a preset voltage range. This ensures that the voltage output by the voltage conversion circuit 400 matches the required voltage of the first power supply terminal 610, expanding the application range of the battery device. Furthermore, the operating parameters of the voltage conversion circuit 400 can be adjusted according to the battery parameters of the low-voltage battery 100, so that the discharge power of the first power supply terminal 610 needs to be adjusted according to the battery parameters. This reduces the risk of over-discharge of the low-voltage battery 100, which helps to extend the life of the low-voltage battery 100. In addition, the controller 700 can also adjust the discharge current according to the electrical parameters of the first power supply terminal 610, which helps to improve the discharge safety of the battery device.

[0156] In some embodiments, see Figure 2 As shown, a buffer capacitor C1 is provided between the positive terminal V+ and the negative terminal GND of the first power supply terminal 610. The buffer capacitor C1 serves as an energy storage element and can be used to absorb the inrush current of the first power supply terminal 610.

[0157] In some embodiments, see Figure 2 As shown, the voltage conversion circuit 400 includes a first switch Q1, a second switch Q2, and a first inductor L1; the first terminal of the first switch Q1 is connected to the positive terminal V+ of the first power supply terminal 610, the second terminal of the first switch Q1 and the first terminal of the second switch Q2 are both connected to the first terminal of the first inductor L1, the second terminal of the first inductor L1 is connected to the positive terminal of the low-voltage battery 100, and the second terminal of the second switch Q2 is grounded.

[0158] In this embodiment, the second switch Q2 is turned on, and the low-voltage battery 100 charges the first inductor L1. The induced electromotive force in the first inductor L1 is opposite in direction to the voltage of the low-voltage battery 100. When the second switch Q2 is turned off, the first switch Q1 is turned on, and the first inductor L1 freewheels, with the current direction still towards the first power supply terminal 610. The voltage of the first inductor L1 is equivalent to V1. At this time, the output voltage of the voltage conversion circuit 400 is Vout = Vb + V1, where Vb is the output voltage of the low-voltage battery 100. Taking the on-time of the second switch Q2 as Ton and the duty cycle as D, the output voltage of the voltage conversion circuit 400 is Vout = Vb *

[0159] (1 / (1-D)).

[0160] In some embodiments, see Figure 2As shown, the voltage conversion circuit 400 also includes a second capacitor C2. The first terminal of the second capacitor C2 is connected to the positive terminal of the low-voltage battery 100, and the second terminal of the second capacitor C2 is grounded. In this embodiment, the two terminals of the second capacitor C2 are connected to the positive and negative terminals of the low-voltage battery 100, respectively. This allows for pre-charging of the voltage across the low-voltage battery 100 during the charging and discharging process, reducing safety hazards during the initial charging and discharging of the battery device.

[0161] In some embodiments, see Figure 2 As shown, the voltage conversion circuit 400 also includes a first diode D1, the anode of the first diode D1 is connected to the second terminal of the second switching transistor Q2, and the cathode of the first diode D1 is connected to the first terminal of the second switching transistor Q2.

[0162] In this embodiment, the first switch Q1, the second switch Q2, the buffer capacitor C1, the second capacitor C2, the first inductor L1, and the first diode D1 constitute a BUCK circuit. This allows for easy replacement of the low-voltage battery 100 because the BUCK circuit adjusts the input and output voltages. When the state of charge (SOC) is very low, the BUCK circuit reduces the charging current. If the output current of the DC-DC converter is too high, the BUCK circuit reduces the current, preventing the battery from being unable to withstand the large current. If the SOC of the low-voltage battery 100 is already very high, approaching its rated voltage and close to the external open-circuit voltage, the first switch K1 closes, and the current is still very small.

[0163] In some embodiments, combined with Figure 2 In boost mode, the first switch Q1 is turned off, and the output voltage of the low-voltage battery 100 is boosted through the first inductor L1, the first switch Q1, and the second switch Q2, and then discharged to the first power supply terminal 610.

[0164] In some embodiments, see Figure 2 As shown, the voltage conversion circuit 400 also includes a first current sensor CT1, which is connected between the first inductor L1 and the positive terminal of the low-voltage battery 100. The first current sensor CT1 is used to detect the current at the positive terminal of the low-voltage battery 100 and send the detection result to the controller 700. The controller 700 adjusts the operating parameters of the voltage conversion circuit 400 according to the detection result.

[0165] In some embodiments, a second current sensor CT2 is also provided at the negative terminal of the low-voltage battery 100 to detect the current at the positive terminal of the low-voltage battery 100 and send the detection result to the controller 700. The controller 700 adjusts the state of the low-voltage battery 100 according to the detection result.

[0166] In some embodiments, see Figure 2As shown, the main switch circuit 710 includes a first switch K1. The switching state of the first switch K1 is controlled by the controller 700. The first switch K1 can be a bidirectional switch composed of top-to-top MOS transistors.

[0167] In some embodiments, see Figure 3 As shown, the battery device also includes: a control circuit 300 and an energy storage circuit 200. The control circuit 300 is connected to the low-voltage battery 100. The energy storage circuit 200 is connected to both the low-voltage battery 100 and the control circuit 300. The control circuit 300 is controlled by the controller 700 to control the low-voltage battery 100 and the energy storage circuit 200 to charge each other.

[0168] In this embodiment, by connecting the energy storage circuit 200 to both the low-voltage battery 100 and the control circuit 300, and having the control circuit 300 control the mutual charging between the low-voltage battery 100 and the energy storage circuit 200, the low-voltage battery 100 can be heated using a pulse self-heating method. For example, when the battery device is used in a vehicle, it may not provide sufficient power at low temperatures. Heating the low-voltage battery 100 using an external PTC requires an additional temperature control structure, resulting in complex structure, uneven heating, and slow heating speed. By integrating the control circuit 300 and the energy storage circuit 200 into the battery device, self-heating of the battery device can replace heating film heating or coolant heating, making the battery device simpler and enabling independent self-heating control without the need for an additional temperature control structure. This facilitates the layout and simplification of the vehicle battery system.

[0169] In some embodiments, see Figure 4 As shown, the battery device also includes a control switch 630, which is connected between the control circuit 300 and the low-voltage battery 100. The control switch 630 is controlled by the controller 700 to control the connection between the control circuit 300 and the low-voltage battery 100.

[0170] In some embodiments, see Figure 4 As shown, the control circuit 300 also includes a control switch 630, which is connected to the low-voltage battery 100 and the control circuit 300. The switching state of the control switch 630 is controlled by the controller 700, which can control the connection relationship between the low-voltage battery 100 and the control circuit 300.

[0171] In this embodiment, when the temperature of the low-voltage battery 100 is less than the first preset temperature threshold, the controller 700 can control the control switch 630 to be turned on, and the control circuit 300 operates in self-heating mode. This allows the low-voltage battery 100 to charge each other with the energy storage circuit 200 through pulse self-heating, thereby achieving the self-heating effect of the low-voltage battery 100. During charging or discharging, the control switch 630 is turned off.

[0172] In some embodiments, the first preset temperature threshold may be 0 degrees Celsius.

[0173] In some embodiments, if the temperature of the low-voltage battery 100 is within the operating temperature range, the control switch 630 is in the off state during the charging or discharging process of the low-voltage battery 100.

[0174] In some embodiments, combined with Figure 5 As shown, the energy storage circuit 200 includes at least a portion of the energy storage devices in the voltage conversion circuit 400.

[0175] In this embodiment, by reusing at least a portion of the energy storage devices in the voltage conversion circuit 400, it is possible to eliminate the need for additional energy storage devices, thereby saving the cost of the battery device. The control circuit 300 controls the low-voltage battery and at least a portion of the energy storage devices in the voltage conversion circuit to charge each other. The low-voltage 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.

[0176] In some embodiments, combined with Figure 5 As shown, the voltage conversion circuit 400 is connected to the control circuit 300, and the voltage conversion circuit 400 is used to perform voltage conversion processing on the input voltage.

[0177] In some embodiments, the control circuit 300 is also controlled by the controller 700 to convert the DC power provided by the low-voltage battery 100 into AC power and output it to the voltage conversion circuit 400.

[0178] In this embodiment, the control circuit 300 can convert the DC power provided by the low-voltage battery 100 into AC power and output it to the voltage conversion circuit 400, thereby providing AC power to the outside world. Furthermore, by reusing at least a portion of the energy storage devices in the voltage conversion circuit 400, the cost of the battery device can be saved. The control circuit 300 controls the low-voltage battery 100 and at least a portion of the energy storage devices in the voltage conversion circuit 400 to charge each other. Pulse self-heating can be used to heat the low-voltage battery 100, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0179] In some embodiments, combined with Figure 5 As shown, the voltage conversion circuit 400 is also used by the controller 700 to convert the AC power provided by the control circuit 300 into voltage and output it to the first power supply terminal 610.

[0180] In the technical solution of this application embodiment, the control circuit 300 can convert the DC power provided by the low-voltage battery 100 into AC power and output it to the voltage conversion circuit 400, thereby providing AC power to the outside world. The voltage conversion circuit 400 performs voltage conversion on the AC power provided by the control circuit 300. Furthermore, the cost of the battery device can be saved by reusing at least a portion of the energy storage devices in the voltage conversion circuit 400. The control circuit 300 controls the low-voltage battery 100 and at least a portion of the energy storage devices in the voltage conversion circuit 400 to charge each other. Pulse self-heating can be used to heat the low-voltage battery 100, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0181] In some embodiments, see Figure 6 As shown, 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 is connected to the midpoint of the first half-bridge 310, and the second end of the energy storage circuit is connected to the midpoint of the second half-bridge 320.

[0182] In this embodiment, the first end of the energy storage circuit is connected to the midpoint of the first half-bridge 310, and the second end of the energy storage circuit 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 low-voltage battery 100 can charge the energy storage circuit. Then, by controlling the switching states of the first half-bridge 310 and the second half-bridge 320, the energy storage circuit can charge the low-voltage battery 100, thereby using pulse self-heating to heat the low-voltage battery 100, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0183] In some embodiments, see Figure 7 As shown, the voltage conversion circuit 400 includes a first transformer T1; the energy storage circuit 200 includes the 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 is connected to the midpoint of the half-bridge of the second half-bridge 320.

[0184] 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 in the voltage conversion circuit 400, there is no need to set up additional energy storage devices, saving the cost of the battery device. The low-voltage battery 100 and the winding of the first transformer are mutually charged by the control circuit 300. The low-voltage 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.

[0185] In some embodiments, see Figure 7 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.

[0186] 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.

[0187] In some embodiments, see Figure 7 As shown, the first transformer T1 in the voltage conversion circuit 400 can be connected to the second power supply terminal 620 to provide AC power to the second power supply terminal 620.

[0188] In some embodiments, the first transformer T1 and the second power supply terminal 620 may also be provided with a rectifier-inverter circuit, which can convert the AC power output from the first transformer T1 into DC power output to the second power supply terminal 620.

[0189] In some embodiments, the first transformer T1 and the second power supply terminal 620 may also be provided with at least two stages of rectifier-inverter circuits. The first stage rectifier-inverter circuit can convert the AC power output by the first transformer T1 into DC power, and the second stage rectifier-inverter circuit can convert the DC power output by the first stage rectifier-inverter circuit into AC power, thereby providing AC power to the second power supply terminal 620 and isolating the first transformer T1 and the second power supply terminal 620.

[0190] In some embodiments, see Figure 8As 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.

[0191] In this embodiment, 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 device. The low-voltage battery 100 and the energy storage inductor L4 are mutually charged by the control circuit 300. The low-voltage 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.

[0192] In some embodiments, see Figure 9 As shown, the energy storage circuit includes: the energy storage circuit 200 includes: an energy storage inductor L3, the energy storage inductor L3 is 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 low-voltage battery 100 charges each other with the energy storage inductor L3 through the control circuit 300.

[0193] 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 low-voltage battery 100 and the energy storage inductor to charge each other. The low-voltage 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.

[0194] In some embodiments, see Figure 10 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.

[0195] In this embodiment, an additional energy storage switch K3 and an energy storage inductor L3 are provided in the energy storage circuit 200. By controlling the connection state of the energy storage inductor K3 through the energy storage switch K3, the impact of the low-voltage battery 100 on the voltage conversion circuit 400 and the low-voltage battery 100 when the low-voltage battery 100 is self-heating can be reduced. When the low-voltage battery 100 does not need to be self-heated, the energy storage switch K3 can be turned off. When the voltage conversion circuit 400 is working, the control circuit 300 can also control the low-voltage battery 100 and the energy storage inductor L3 to charge each other. The low-voltage 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.

[0196] In some embodiments, see Figure 10As shown, the first half-bridge 310 includes a ninth switch Q9 and a tenth switch Q10, which are connected in series to form a half-bridge circuit.

[0197] In some embodiments, see Figure 10 As shown, the second half-bridge 320 includes an eleventh switch Q11 and a twelfth switch Q12, which are connected in series to form a half-bridge circuit.

[0198] In some embodiments, see Figure 11 As shown, the low-voltage battery 100 includes a first battery pack B1 and a second battery pack B2, with the first battery pack B1 and the second battery pack B2 connected in series.

[0199] The battery device also includes a control circuit 300, which is controlled by the controller 700 and can control the first battery pack and the second battery pack to charge each other through the energy storage circuit. For example, the control circuit 300 can control the first battery pack B1 to output a pulse current to charge the second battery pack B2, or control the second battery pack B2 to output a pulse current to charge the first battery pack B1.

[0200] In this embodiment, the low-voltage battery 100 includes a first battery pack B1 and a second battery pack B2 connected in series. The controller 700 can control the state of the control circuit 300 so that during the low-voltage battery discharge phase, the first battery pack charges and stores energy in the energy storage circuit via the control circuit 300. Then, during the low-voltage battery charging phase, the energy storage circuit charges the second battery pack via the control circuit 300. Then, during the low-voltage battery discharge phase, the second battery pack charges and stores energy in the energy storage circuit via the control circuit 300. During the low-voltage battery charging phase, the energy storage circuit charges the first battery pack via the control circuit 300. This allows the first and second battery packs in the low-voltage battery to charge each other via the energy storage circuit, thereby heating the low-voltage battery using pulse self-heating instead of heating film heating or coolant heating. This simplifies the battery device and facilitates the arrangement and simplification of the battery system.

[0201] 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.

[0202] In this embodiment, the low-voltage 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 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. During the discharge phase of the low-voltage 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 low-voltage battery 100, the first transformer... The primary winding of device T1 charges the second battery pack B2 via the first half-bridge 310. Then, the state of the first half-bridge 310 is controlled. During the discharge phase of the low-voltage 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 low-voltage 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 low-voltage battery 100 to charge each other via the energy storage circuit 200. Thus, the low-voltage 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 battery system.

[0203] 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.

[0204] 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 low-voltage 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 low-voltage 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. Battery pack B2 is charged, and then the state of the first half-bridge 310 is controlled. During the discharge phase of the low-voltage battery 100, the second battery pack 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 phase of the low-voltage battery 100, the energy storage inductor L4 in the voltage conversion circuit 400 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 low-voltage battery 100 to charge each other through the energy storage inductor L4 in the voltage conversion circuit 400. This uses pulse self-heating to heat the low-voltage battery 100, replacing heating film heating or coolant heating, making the battery device simpler and facilitating the layout and simplification of the battery system.

[0205] 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 low-voltage battery 100 charges each other with the energy storage inductor L3 through the control circuit 300.

[0206] 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 low-voltage battery 100 to charge each other through the energy storage inductor L3, thereby heating the low-voltage 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 battery system.

[0207] In some embodiments, see Figure 14 As shown, the control switch 630 includes a two-way switch K2, which is connected between the control circuit 300 and the positive terminal of the low-voltage battery 100.

[0208] In some embodiments, see Figure 15As shown, the energy storage circuit 200 also includes an energy storage switch K3, which is connected in series with the energy storage inductor L3.

[0209] 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 low-voltage battery 100. When the low-voltage 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 low-voltage battery 100 are controlled to charge each other through the energy storage inductor L3, thereby heating the low-voltage 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 battery system.

[0210] In some embodiments, the energy storage switch K3 can be a bidirectional switch.

[0211] In some embodiments, the energy storage inductor L3 can be a common-mode inductor.

[0212] In some embodiments, see Figure 16 As shown, the control circuit 300 also includes a first half-bridge 310 and a second half-bridge 320; 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.

[0213] In this embodiment, the control circuit 300 further includes a first half-bridge 310 and a second half-bridge 320. By setting the first end of the energy storage circuit 200 to be connected to the midpoint of the first half-bridge 310 and the second end of the energy storage circuit 200 to be connected to the midpoint of the second half-bridge 320, the first battery pack B1 and the second battery pack B2 in the low-voltage battery 100 are controlled to charge each other with the energy storage circuit 200 through the first half-bridge 310 and the second half-bridge 320. This allows the low-voltage battery 100 to 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.

[0214] In some embodiments, see Figure 16 As shown, the control circuit 300 also includes a first half-bridge 310 and a second half-bridge 320; 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.

[0215] In this embodiment, the control circuit 300 further includes a first half-bridge 310 and a second half-bridge 320. By setting the first end of the energy storage inductor L3 to be connected to the midpoint of the first half-bridge 310 and the second end of the energy storage inductor L3 to be connected to the midpoint of the second half-bridge 320, the first battery pack B1 and the second battery pack B2 in the low-voltage battery 100 are controlled to charge each other with the energy storage inductor L3 through the first half-bridge 310 and the second half-bridge 320. This allows the low-voltage battery 100 to 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.

[0216] In some embodiments, see Figure 17 As shown, the energy storage circuit 200 further includes an energy storage inductor L3, which is a common-mode inductor; the control circuit 300 further includes a first half-bridge 310 and a second half-bridge 320. The first end of the common-mode inductor is connected to the midpoint of the first half-bridge 310, the second end of the common-mode inductor is connected to the midpoint of the second half-bridge 320, and the third and fourth ends of the common-mode inductor are connected to the common node of the first battery pack B1 and the second battery pack B2.

[0217] In this embodiment, the control circuit 300 further includes a first half-bridge 310 and a second half-bridge 320. By setting the first end of the common-mode inductor to be connected to the midpoint of the first half-bridge 310, the second end of the common-mode inductor to be connected to the midpoint of the second half-bridge 320, and the third and fourth ends of the common-mode inductor to be connected to the common node of the first battery pack B1 and the second battery pack B2, the first battery pack B1 and the second battery pack B2 in the low-voltage battery 100 are controlled to charge each other through the first half-bridge 310 and the second half-bridge 320, thereby heating the low-voltage 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 battery system.

[0218] In some embodiments, see Figure 17 As shown, the main switch circuit 710 includes a battery positive switch K1, which is connected between the positive terminal of the low-voltage battery and the positive terminal of the first power supply terminal 610610.

[0219] In some embodiments, see Figure 18 As shown, the voltage conversion circuit 400 further includes: a first rectifier-inverter unit 510, which is connected to the first transformer T1 and is used to convert the AC power output by the first transformer into DC power.

[0220] In this embodiment, a first rectifier-inverter unit is set on the secondary winding of the first transformer. The first rectifier-inverter unit converts the AC power output from the first transformer into DC power and outputs it to the first power supply terminal. If the charging voltage provided by the first power supply terminal matches the voltage of the low-voltage battery, the main switch circuit is turned on, and the first power supply terminal can directly charge the low-voltage battery. If the charging voltage provided by the first power supply terminal does not match the voltage of the low-voltage battery, the main switch circuit can be turned off, and the low-voltage battery is charged by the first power supply terminal through the voltage conversion circuit 400. This allows the battery device to be charged when different voltages are connected to the first power supply terminal, reducing the influence of the electrical parameters of the first power supply terminal on the charging of the low-voltage battery.

[0221] In some embodiments, see Figure 18 As shown, the voltage conversion circuit 400 further includes a second rectifier-inverter unit 520, which is connected between the first rectifier-inverter unit 510 and the first power supply terminal. The second rectifier-inverter unit converts DC power into AC power and outputs it to the first power supply terminal.

[0222] In this embodiment of the application, by setting a first rectifier-inverter unit 510 and a second rectifier-inverter unit 520 on the secondary winding of the first transformer T1, the first rectifier-inverter unit 510 can convert the AC power output from the first transformer T1 into DC power, and the second rectifier-inverter unit 520 can convert the DC power into AC power and output it to the first power supply terminal, so that the first power supply terminal provides AC power to the outside, which is beneficial to maintaining the voltage stability of the first power supply terminal.

[0223] In some embodiments, see Figure 18 As shown, the first rectifier-inverter unit 510 includes a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, and an eighth switch Q8, which together form a full-bridge topology circuit.

[0224] In some embodiments, see Figure 18 As shown, the second rectifier-inverter unit 520 includes a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4, which together form a full-bridge topology circuit.

[0225] 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.

[0226] 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 operates in a balancing mode. The controller 700 can control the bridge arm in the control circuit 300 to operate in a corresponding switching state, allowing the battery pack with higher charge level in the first battery pack B1 and the second battery pack B2 to charge the battery pack with lower charge level, thereby achieving charge balancing between the first battery pack B1 and the second battery pack B2. Furthermore, after the bridge arm in the control circuit 300 is in an open state and remains stationary for a first preset time, 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 and the second battery pack 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 charge level of the first battery pack B1.

[0227] In some embodiments, the first battery pack B1 and the second battery pack B2 have the same voltage.

[0228] In some embodiments, the first battery pack B1 and the second battery pack B2 have the same rated capacity.

[0229] In some embodiments, the controller 700 is also configured to control the low-voltage battery and the energy storage circuit to charge each other in self-heating mode.

[0230] In this embodiment, when the temperature of the low-voltage battery is low, the battery device can be controlled to operate in a self-heating mode, and the low-voltage battery and the energy storage circuit can be controlled to charge each other so that the low-voltage battery can be self-heated. The low-voltage battery is charged by pulse self-heating, which not only reduces the cost, but also has a smaller 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 battery system.

[0231] In some embodiments, the controller 700 is further configured to operate in a self-heating mode when the temperature of the low-voltage battery 100 is less than a first preset temperature threshold, and control the first battery pack B1 and the second battery pack B2 to alternately generate pulse currents through the energy storage circuit 200 so as to enable the low-voltage battery 100 to self-heat.

[0232] In this embodiment, when the temperature of the low-voltage battery 100 is lower than the first preset temperature threshold, the controller 700 can control the circuit 300 to operate in self-heating mode. This allows the low-voltage battery 100 to be charged by the first battery pack B1 and the second battery pack B2 alternately outputting pulse current through the control circuit 300. This not only reduces costs but also minimizes the total voltage and current ripple during pulse heating, making heating safer. It also replaces heating film heating or coolant heating, simplifying the battery device and facilitating the layout and simplification of the battery system.

[0233] In some embodiments, when the temperature of the low-voltage battery 100 is lower than a first preset temperature threshold, the controller 700 operates in pulse heating mode. The controller 700 controls the main switch circuit 710 to be in the off state, first controlling the ninth switch Q9 to be turned on and the tenth switch Q10 to be turned off, so that the first battery pack B1 charges the energy storage circuit 200. Then, the controller controls the ninth switch Q9 to be turned off and the tenth switch Q10 to be turned on, so that the energy storage circuit 200 freewheels to charge the second battery pack B2. This cycle is repeated multiple times to achieve self-heating of the second battery pack B2. After multiple cycles, the controller 700 controls the second battery pack B2 to charge the first battery pack B1 through the energy storage circuit 200. Since the body diodes integrated by the ninth switch Q9 and the tenth switch Q10 generate a large amount of heat, the current and heat are shared by the diodes of the ninth switch Q9 and the tenth switch Q10 connected in antiparallel.

[0234] 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.

[0235] 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 level threshold, the controller 700 can control the circuit 300 to operate in a corresponding switching state, causing the battery pack with higher charge level in the first battery pack B1 and the second battery pack B2 to charge 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 the control circuit 300 is disconnected and left idle for a first preset time, 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 level 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 level threshold. This second preset charge level threshold is less than the first preset charge level threshold, and the second preset charge level threshold can be set to be less than 1% of the charge level of the first battery pack B1.

[0236] In some embodiments, when the difference in charge level between the first battery pack B1 and the second battery pack B2 is greater than a first preset charge level threshold, the controller 700 operates in a balancing mode, causing the battery pack with higher charge level to charge the battery pack with lower charge level between the first battery pack B1 and the second battery pack B2. For example, in combination with... Figure 5 As shown, when the first battery pack B1 has a high charge level, the controller 700 first controls the ninth switch Q9 to turn on and the tenth switch Q10 to turn off, so that the first battery pack B1 charges the energy storage circuit 200. Then, the controller controls the ninth switch Q9 to turn off and the tenth switch Q10 to turn on, so that the energy storage circuit 200 continues to charge the second battery pack B2. This cycle continues until the charge difference between the first battery pack B1 and the second battery pack B2 is less than the second preset charge threshold.

[0237] In some embodiments, the controller 700 is also configured to control the first battery pack B1 and the second battery pack B2 to charge each other in a second self-heating mode.

[0238] In this embodiment, when the temperature of the low-voltage battery 100 is lower than the first preset temperature threshold, the controller 700 can operate in the second self-heating mode, thereby enabling the low-voltage battery 100 to be connected to the energy storage circuit 200 via the control circuit 300. The first battery pack B1 and the second battery pack B2 are controlled to alternately output pulse currents to charge the low-voltage battery 100 using pulse self-heating. This not only reduces costs but also minimizes the total voltage and current ripple during pulse heating, making heating safer. It also replaces heating film heating or coolant heating, simplifying the structure of the battery device and facilitating the layout and simplification of the battery system.

[0239] In some embodiments, the controller 700 is further configured to control the voltage conversion circuit 400 to convert the AC power of the first power supply terminal 610 into DC power in AC charging mode and to charge the low-voltage battery 100.

[0240] In this embodiment of the application, when AC power is connected to the first power supply terminal 610, the voltage conversion circuit 400 can realize the conversion between AC and DC power. The voltage conversion circuit 400 converts the AC power provided by the first power supply terminal 610 into DC power to charge the low-voltage battery 100, so that the AC charging pile can directly charge the battery device, which facilitates the independent charging of the battery device in the vehicle and expands the application of the battery device in new energy vehicles and fuel vehicles.

[0241] In some embodiments, the controller 700 is further configured to control the voltage conversion circuit 400 to convert the DC power supplied by the low-voltage battery 100 into AC power in AC power supply mode to supply power to the first power supply terminal 610.

[0242] In this embodiment, when an AC load is connected to the first power supply terminal 610, the controller 700 operates in AC power supply mode. The voltage conversion circuit 400 converts the DC power output from the low-voltage battery 100 into AC power and outputs it to the first power supply terminal 610. This allows the low-voltage battery 100 to provide AC power to the vehicle through the voltage conversion circuit 400. This reduces the potential for the power battery pack in new energy vehicles to provide AC power to the vehicle's interior, which could affect the vehicle's power output. It can also provide AC power to fuel vehicles, thus expanding the application of battery devices in both new energy vehicles and fuel vehicles.

[0243] In some embodiments, the voltages at both ends of the first battery pack B1 and the second battery pack B2 are the same.

[0244] In some embodiments, the output voltage range of the first battery pack B1 and the second battery pack B2 is 12V-72V.

[0245] In some embodiments, the first battery pack B1 includes a 12V lithium-ion battery or sodium-ion battery, or other rechargeable battery.

[0246] In some embodiments, the first battery pack B1 includes a 24V lithium-ion battery or sodium-ion battery, or other rechargeable battery.

[0247] In some embodiments, the first battery pack B1 includes a 48V lithium-ion battery or sodium-ion battery, or other rechargeable batteries.

[0248] In some embodiments, the first battery pack B1 includes a 72V lithium-ion battery or sodium-ion battery, or other rechargeable battery.

[0249] In this embodiment, the battery device 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 100V.

[0250] In some embodiments, the second battery pack B2 includes a 12V lithium-ion battery or sodium-ion battery, or other rechargeable batteries.

[0251] In some embodiments, the second battery pack B2 includes a 24V lithium-ion battery or sodium-ion battery, or other rechargeable battery.

[0252] 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.

[0253] 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 100V.

[0254] This application provides a chassis that includes a battery device as described in any of the above embodiments.

[0255] This application provides a vehicle including a battery device as described in any of the above embodiments.

[0256] This application provides a vehicle including the chassis described in the above embodiments.

[0257] In this embodiment, the vehicle is equipped with the battery device described in any of the above embodiments. The controller 700 can adjust the operating parameters of the voltage conversion circuit 400 according to the electrical parameters of the first power supply terminal 610 and the battery parameters of the low-voltage battery. If the voltage of the first power supply terminal 610 changes significantly due to changes in the required power, the voltage of the first power supply terminal 610 can be adjusted by adjusting the operating parameters of the voltage conversion circuit 400. If the charging voltage provided by the first power supply terminal 610 does not match the voltage of the low-voltage battery 100, the operating parameters of the voltage conversion circuit 400 can be adjusted to output a voltage that matches the voltage of the low-voltage battery 100 to charge the low-voltage battery 100, thereby expanding the application scenarios of the battery device and improving the stability of the battery device.

[0258] In some embodiments, the vehicle includes a power battery pack. The low-voltage battery 100 includes a first battery pack B1 and a second battery pack B2 connected in series. The low-voltage battery 100 can provide AC power to the vehicle through a voltage conversion circuit 400, reducing the potential for the power battery pack to provide AC power to the vehicle and affecting the vehicle's power output. This allows the low-voltage battery 100 and the power battery pack to respectively supply power to the vehicle's electrical load and power load.

[0259] With the battery device in this embodiment, the controller 700 can control the first battery pack B1 and the second battery pack B2 to alternately output pulse current, and charge the low-voltage battery 100 by pulse self-heating. This not only reduces costs, but also reduces the total voltage and current ripple during the pulse heating process, 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 battery system.

[0260] In some embodiments, the energy storage circuit 200 may include one or more inductors, or may reuse the inductors of a transformer or motor winding in the vehicle.

[0261] In some embodiments, the controller 700 is also configured to control the voltage conversion circuit 400 to output AC power to the first power supply terminal 610 when an AC load is connected to the first power supply terminal 610.

[0262] In this embodiment, the vehicle can be a new energy vehicle or a fuel vehicle. By installing the battery device from any of the above embodiments in the vehicle chassis, when an AC load is connected to the first power supply terminal 610, the controller 700 controls the voltage conversion circuit 400 to convert the DC power output from the low-voltage battery 100 into low-voltage AC power. This allows the low-voltage battery 100 to provide AC power to the vehicle through the voltage conversion circuit 400. In new energy vehicles, this reduces the potential for the power battery pack to supply AC power to the vehicle's interior, thus reducing the risk of the power battery pack affecting the vehicle's power output. The low-voltage battery 100 and the power battery pack respectively supply power to the vehicle's electrical load and power load. In fuel vehicles, this provides AC power to the fuel vehicle.

[0263] 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.

[0264] 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.

[0265] 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.

[0266] 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.

[0267] 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.

[0268] 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. A battery device, characterized in that, include: Low-voltage batteries; A voltage conversion circuit is connected to the low-voltage battery and the first power supply terminal. A controller, connected to the voltage conversion circuit, is used to adjust the operating parameters of the voltage conversion circuit according to the electrical parameters of the first power supply terminal and the battery parameters of the low-voltage battery.

2. The battery device according to claim 1, characterized in that, The battery device also includes: The main switch circuit is connected to the low-voltage battery and the first power supply terminal, and is used to control the connection between the low-voltage battery and the first power supply terminal; The controller is connected to the voltage conversion circuit and the main switch circuit, and is also used to adjust the operating parameters of the voltage conversion circuit and the main switch circuit according to the electrical parameters of the first power supply terminal and the battery parameters of the low-voltage battery.

3. The battery device according to claim 2, characterized in that, The controller is also configured to control the first power supply terminal to select one of the main switching circuit and the voltage conversion circuit to charge the low-voltage battery based on the electrical parameters of the first power supply terminal.

4. The battery device according to claim 2, characterized in that, The controller is also used to control the switching frequency of the main switching circuit according to the electrical parameters of the first power supply terminal and the battery parameters of the low-voltage battery, so as to adjust the electrical parameters of the first power supply terminal charging the low-voltage battery through the main switching circuit.

5. The battery device according to claim 2, characterized in that, The controller is also used to control the operating parameters of the voltage conversion circuit according to the battery parameters of the low-voltage battery and the electrical parameters of the first power supply terminal, so as to adjust the electrical parameters of the first power supply terminal charging the low-voltage battery through the voltage conversion circuit.

6. The battery device according to claim 2, characterized in that, The controller is also configured to control the low-voltage battery to select one of the main switching circuit and the voltage conversion circuit to supply power to the first power supply terminal based on the electrical parameters of the first power supply terminal.

7. The battery device according to claim 2, characterized in that, The controller is also used to control the switching frequency of the main switching circuit according to the battery parameters of the low-voltage battery and the electrical parameters of the first power supply terminal, so as to adjust the discharge parameters of the low-voltage battery discharging to the first power supply terminal through the main switching circuit.

8. The battery device according to claim 1, characterized in that, The controller is also used to control the operating parameters of the voltage conversion circuit according to the battery parameters of the low-voltage battery and the electrical parameters of the first power supply terminal, so as to adjust the discharge parameters of the low-voltage battery discharging to the first power supply terminal through the voltage conversion circuit.

9. The battery device according to claim 1, characterized in that, The voltage conversion circuit includes a first switching transistor, a second switching transistor, and a first inductor. The first end of the first switching transistor is connected to the positive terminal of the first power supply terminal. The second end of the first switching transistor and the first end of the second switching transistor are both connected to the first end of the first inductor. The second end of the first inductor is also connected to the positive terminal of the low-voltage battery. The second end of the second switching transistor is also connected to the positive terminal of the low-voltage battery.

10. The battery device according to claim 1, characterized in that, The voltage conversion circuit includes a second capacitor, the first end of which is connected to the positive terminal of the low-voltage battery, and the second end of which is grounded.

11. The battery device according to claim 9, characterized in that, The voltage conversion circuit further includes a first diode, the anode of which is connected to the second terminal of the second switching transistor, and the cathode of which is connected to the first terminal of the second switching transistor.

12. The battery device according to claim 1, characterized in that, The battery device includes a buffer capacitor, the two ends of which are respectively connected to the positive and negative terminals of the first power supply terminal.

13. The battery device according to any one of claims 1-12, characterized in that, The battery device also includes: The control circuit is connected to the low-voltage battery; An energy storage circuit is connected to both the low-voltage battery and the control circuit. The control circuit is controlled by the controller to control the low-voltage battery and the energy storage circuit to charge each other.

14. The battery device according to claim 13, characterized in that, The battery device also includes: A control switch is connected between the control circuit and the low-voltage battery, and is controlled by the controller to control the connection relationship between the control circuit and the low-voltage battery.

15. The battery device according to claim 13, characterized in that, The energy storage circuit includes at least a portion of the energy storage devices in the voltage conversion circuit.

16. The battery device according to claim 13, characterized in that, The voltage conversion circuit is connected to the control circuit, and the voltage conversion circuit is used to perform voltage conversion processing on the input voltage.

17. The battery device according to claim 16, characterized in that, The control circuit is also used to be controlled by the controller to convert the DC power provided by the low-voltage battery into AC power and output it to the voltage conversion circuit.

18. The battery device according to claim 17, characterized in that, The voltage conversion circuit is also controlled by the controller to convert the input AC power into voltage and output it to the first power supply terminal.

19. The battery device according to claim 13, 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.

20. The battery device according to claim 19, 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.

21. The battery device according to claim 19, 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.

22. The battery device according to claim 19, 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 low-voltage battery charges each other through the control circuit and the energy storage inductor.

23. The battery device according to claim 22, characterized in that, The energy storage circuit also includes an energy storage switch, which is connected in series with the energy storage inductor.

24. The battery device according to claim 13, characterized in that, The low-voltage 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. The battery device also includes: The control circuit, controlled by the controller, is used to control the first battery pack and the second battery pack to charge each other through the energy storage circuit.

25. The battery device according to claim 24, characterized in that, The control circuit includes a first half-bridge; 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.

26. The battery device according to claim 25, 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.

27. The battery device according to claim 25, 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.

28. The battery device according to claim 25, 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 low-voltage battery charges each other through the control circuit and the energy storage inductor.

29. The battery device according to claim 28, characterized in that, The energy storage circuit also includes an energy storage switch, which is connected in series with the energy storage inductor.

30. The battery device according to claim 24, characterized in that, The control circuit also includes a first half-bridge and a second half-bridge; 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.

31. The battery device according to claim 24, characterized in that, The energy storage circuit also includes: Energy storage inductor, wherein the energy storage inductor is a common-mode inductor; The control circuit also includes a first half-bridge and a second half-bridge; The first end of the common-mode inductor is connected to the midpoint of the first half-bridge, the second end of the common-mode inductor is connected to the midpoint of the second half-bridge, and the third and fourth ends of the common-mode inductor are connected to the common node of the first battery pack and the second battery pack.

32. The battery device according to claim 20 or 26, characterized in that, The voltage conversion circuit further includes: The first rectifier-inverter unit is connected to the first transformer and is used to convert the AC power output by the first transformer into DC power.

33. The battery device according to claim 32, characterized in that, The voltage conversion circuit further includes a second rectifier-inverter unit, connected between the first rectifier-inverter unit and the first power supply terminal, which converts the DC power into AC power and outputs it to the first power supply terminal.

34. The battery device according to claim 24, characterized in that, The controller is also used to control the first battery pack and the second battery pack to perform power balancing through the control circuit in the equalization mode, so as to reduce the power difference between the first battery pack and the second battery pack.

35. The battery device according to claim 13, characterized in that, The controller is also used to control the low-voltage battery and the energy storage circuit to charge each other in the first self-heating mode.

36. The battery device according to claim 24, characterized in that, The controller is also used to control the first battery pack and the second battery pack to charge each other in the second self-heating mode.

37. The battery device according to any one of claims 1-12, characterized in that, The controller is also configured to, in AC charging mode, control the voltage conversion circuit to convert the AC power from the first power supply terminal into DC power and charge the low-voltage battery.

38. The battery device according to any one of claims 1-12, characterized in that, The controller is also configured to, in AC power supply mode, control the voltage conversion circuit to convert the DC power supplied by the low-voltage battery into AC power to supply power to the first power supply terminal.

39. A chassis, characterized in that, The chassis includes the battery device as described in any one of claims 1 to 38.

40. A vehicle, characterized in that, The vehicle includes a battery device as described in any one of claims 1 to 38; or includes a chassis as described in claim 39.

Images