Vehicle battery charging and discharging control circuit, device and vehicle

Abstract

The present disclosure relates to a vehicle battery charging and discharging control circuit, device and vehicle, and relates to the technical field of batteries. The vehicle battery charging and discharging control circuit comprises: a plurality of battery packs, the battery packs comprising a first battery pack and a second battery pack; a switching circuit for controlling the series or parallel connection between the plurality of battery packs; wherein the switching circuit comprises a double-pole double-throw switch, a first switch and a second switch; the second end of the first switch is connected to the positive electrode of the first battery pack, and the second end of the second switch is connected to the negative electrode of the second battery pack; and an electric drive device connected to the battery packs to drive the vehicle. The present disclosure can realize the series-parallel conversion between the plurality of battery packs through the control of the double-pole double-throw switch, the first switch and the second switch in the switching circuit.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a vehicle battery charging and discharging control circuit, a vehicle battery charging and discharging control device, and a vehicle. Background Technology

[0002] With the development of new energy vehicles / electric vehicles, users have placed higher demands on charging compatibility, charging speed, and low-voltage power supply methods. Performance improvements in these areas all depend on the design of the vehicle's high-voltage architecture. Therefore, it is necessary to optimize the high-voltage architecture of new energy vehicles.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this disclosure provides a vehicle battery charging and discharging control circuit, a vehicle battery charging and discharging control device, and a vehicle, which can realize series-parallel conversion between multiple battery packs.

[0005] According to a first aspect of the present disclosure, a vehicle battery charging and discharging control circuit is provided, comprising: a plurality of battery packs, the battery packs including a first battery pack and a second battery pack; a switching circuit for controlling the series or parallel connection between the plurality of battery packs; wherein the switching circuit includes a double-pole double-throw switch, a first switch and a second switch; a second terminal of the first switch is connected to the positive terminal of the first battery pack, and a second terminal of the second switch is connected to the negative terminal of the second battery pack; and an electric drive device connected to the battery packs to drive the vehicle.

[0006] In some possible embodiments of this disclosure, the double-pole double-throw switch includes a first interface, a second interface, a third interface, and a fourth interface; the first interface, the second interface, the third interface, and the fourth interface of the double-pole double-throw switch are respectively connected to the negative terminal of the first battery pack, the first terminal of the second switch, the positive terminal of the second battery pack, and the first terminal of the first switch.

[0007] In some possible embodiments of this disclosure, when the first interface of the double-pole double-throw switch is connected to the third interface, the first battery pack and the second battery pack are connected in series; or, when the first interface of the double-pole double-throw switch is connected to the second interface and the third interface is connected to the fourth interface, the first battery pack and the second battery pack are connected in parallel.

[0008] In some possible embodiments of this disclosure, the switching circuit further includes a seventh switch; when the first battery pack and the second battery pack are connected in series, the first switch, the second switch, and the seventh switch are closed, and the first battery pack and the second battery pack connected in series provide a first voltage to the electric drive device; wherein, the first terminal of the seventh switch is connected to the input terminal of the electric drive device, and the second terminal of the seventh switch is connected to the first terminal of the first switch.

[0009] In some possible embodiments of this disclosure, the switching circuit further includes a third switch and a fourth switch; when the first battery pack and the second battery pack are connected in series, the first switch, the second switch, the third switch, the fourth switch, and the seventh switch are closed, and a first charging device capable of providing a first charging voltage charges the first battery pack and the second battery pack connected in series; wherein, the first end of the third switch is connected to the first end of the seventh switch, and the second end of the third switch is connected to the output end of the first charging device; the first end of the fourth switch is connected to the first end of the second switch, and the second end of the fourth switch is connected to the output end of the first charging device; the second end of the seventh switch is connected to the first end of the first switch.

[0010] In some possible embodiments of this disclosure, when the first battery pack and the second battery pack are connected in parallel and the first battery pack fails, the second switch and the seventh switch are closed, and the second battery pack provides a second voltage to the electric drive device; wherein, the second end of the seventh switch is connected to the fourth interface of the double-pole double-throw switch.

[0011] In some possible embodiments of this disclosure, when the first battery pack and the second battery pack are connected in parallel, the first switch, the second switch, the third switch, the fourth switch, and the seventh switch are closed, and a second charging device capable of providing a second charging voltage charges the first battery pack and the second battery pack connected in parallel; wherein, the second end of the third switch is connected to the output end of the second charging device; and the second end of the fourth switch is connected to the output end of the second charging device.

[0012] In some possible embodiments of this disclosure, the switching circuit further includes a control switch; when the first battery pack and the second battery pack are connected in series, the first switch, the second switch, the third switch, the fourth switch, and the control switch are closed, and the third charging voltage provided by the third charging device is reduced to the second voltage by the electric drive device to charge the first battery pack and the second battery pack connected in parallel; wherein, the second end of the third switch is connected to the output end of the third charging device; the second end of the fourth switch is connected to the output end of the third charging device; the first end of the control switch is connected to the first or third interface of the double-pole double-throw switch, and the second end of the control switch is connected to the output end of the electric drive device.

[0013] In some possible embodiments of this disclosure, when the first battery pack and the second battery pack are connected in series, the first switch, the second switch, and the control switch are closed, and the electric drive device heats the first battery pack and the second battery pack.

[0014] In some possible embodiments of this disclosure, the electric drive device includes a first electric drive device and a second electric drive device; the control switch includes a fifth switch and a sixth switch; wherein the input terminals of the first electric drive device and the second electric drive device are both connected to the input terminals of the electric drive devices; the output terminal of the first electric drive device is connected to the second terminal of the fifth switch, and the first terminal of the fifth switch is connected to the first or third interface of the double-pole double-throw switch; the output terminal of the second electric drive device is connected to the second terminal of the sixth switch, and the first terminal of the sixth switch is connected to the first or third interface of the double-pole double-throw switch.

[0015] In some possible embodiments of this disclosure, the vehicle battery charging and discharging control circuit further includes: a filtering module, wherein the first ends of the fifth switch and the sixth switch are both connected to the first end of the filtering module, and the second end of the filtering module is connected to the first or third interface of the double-pole double-throw switch.

[0016] In some possible embodiments of this disclosure, the vehicle battery charge / discharge control circuit further includes: a first converter, the first input terminal and the second input terminal of the first converter being connected to the first terminals of a first switch and a second switch, respectively; a second converter, the first input terminal and the second input terminal of the second converter being connected to the second terminals of the first switch and the second switch, respectively; the output terminals of the first converter and the second converter are both connected to the input terminals of a load; wherein, when the first switch and the second switch are closed, a load voltage is provided to the load through at least one of the first converter and the second converter connected in parallel.

[0017] In some possible embodiments of this disclosure, the vehicle battery charging and discharging control circuit further includes: a second converter, the first input terminal and the second input terminal of the second converter being respectively connected to the first switch and the second terminal of the second switch; the output terminal of the second converter being connected to the input terminal of the load; the first interface of the double-pole double-throw switch being connected to the third interface; the first battery pack and the second battery pack being connected in series; the first switch and the second switch being disconnected; and in the non-charging state and non-driving state, the second converter being used to provide load voltage to the load.

[0018] According to a second aspect of the present disclosure, a vehicle battery charging and discharging control device is provided, including a vehicle battery charging and discharging control circuit as described in any of the first aspects above.

[0019] In some possible embodiments of this disclosure, the vehicle battery charging and discharging control device further includes: a controller connected to the switching circuit, the controller being used to control the switching circuit.

[0020] According to a third aspect of the present disclosure, a vehicle is provided, comprising: a vehicle battery charge / discharge control device as described in any of the second aspects above; the vehicle battery charge / discharge control device supplies electrical energy to the electric drive device, or charges the first battery pack and the second battery pack connected in parallel or in series.

[0021] In some possible embodiments of this disclosure, the vehicle further includes a load that obtains load voltage from the first battery pack and / or the second battery pack via a first converter and / or a second converter.

[0022] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0023] The vehicle battery charging and discharging control circuit provided in this disclosure can realize one or more functions of multiple battery packs (e.g., a first battery pack and a second battery pack) through a switching circuit. It enables multiple battery packs to freely switch between series and parallel connections to adapt to charging devices providing different charging voltages, thus improving charging compatibility.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0026] Figure 1This is a flowchart illustrating a vehicle battery charging and discharging control method according to an exemplary embodiment of the present disclosure.

[0027] Figure 2 This is a schematic diagram of the structure of a vehicle battery charging and discharging control circuit according to an exemplary embodiment of the present disclosure.

[0028] Figure 3 This is a schematic diagram illustrating a dual-packet serial drive according to an exemplary embodiment of the present disclosure.

[0029] Figure 4 This is a schematic diagram of a dual-pack series DC direct charger according to an exemplary embodiment of the present disclosure.

[0030] Figure 5 This is a schematic diagram of a dual-packet parallel limp drive according to an exemplary embodiment of the present disclosure.

[0031] Figure 6 This is a schematic diagram of a dual-pack parallel DC direct charger according to an exemplary embodiment of the present disclosure.

[0032] Figure 7 This is a schematic diagram of a dual-packet parallel buck charging according to an exemplary embodiment of the present disclosure.

[0033] Figure 8 This is a schematic diagram illustrating a dual-source, single-channel low-voltage power supply according to an exemplary embodiment of the present disclosure.

[0034] Figure 9 This is a block diagram illustrating a vehicle battery charging and discharging control device according to an exemplary embodiment of the present disclosure.

[0035] Figure 10 This is a frame of a vehicle shown according to an exemplary embodiment of the present disclosure. Figure 1 .

[0036] Figure 11 This is a frame of a vehicle shown according to an exemplary embodiment of the present disclosure. Figure 2 . Detailed Implementation

[0037] Exemplary embodiments of this disclosure will be described in detail herein, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. Various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but can be changed as will become apparent upon understanding this disclosure, except for operations that must be performed in a particular order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0038] The embodiments described below, which are some of the embodiments of this disclosure, do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0039] The specific implementation methods of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. New energy vehicles have high-voltage architectures with 400V and 800V voltage platforms.

[0040] When the high-voltage architecture design adopts an 800V platform, the 800V high-voltage platform significantly increases charging power (P=UI) by increasing voltage (rather than current). The high-voltage platform can increase charging power while keeping the charging current constant, thereby shortening charging time and increasing charging speed. However, this also means that vehicles based on the 800V platform cannot be charged using the numerous 500V and 750V charging stations available on the market, resulting in reduced vehicle charging compatibility.

[0041] To address this, the industry has added boost converters to increase the charging station voltage during charging, enabling 500V and 750V charging stations to charge vehicles and improving charging compatibility. For example, the charging station's output voltage (e.g., 500V) can be boosted to the voltage required by the vehicle's battery (e.g., 800V) using a boost converter. However, the boost converter's output power is limited by the input power (charging station) and its own efficiency (e.g., 95%). For instance, a 500V charging station has a maximum output of 120kW, but after boosting, the actual usable power is 120kW × 95% = 114kW, far lower than the 350kW of an 800V charging station. This also results in the boost charging power being limited by the boost converter's power. When using high-power charging stations, the vehicle cannot fully utilize the charging station's performance, resulting in actual charging power lower than the charging station's power, reducing the charging rate and impacting the user experience.

[0042] When using a 1000V charging pile to charge a new energy vehicle on an 800V high-voltage platform, a step-down converter is required in the relevant technology; otherwise, it may not be able to charge directly or there may be safety hazards.

[0043] Currently, the high-voltage architecture of new energy vehicles is generally based on an 800V or 400V voltage platform, which remains fixed during use. For charging piles that cannot be directly charged, a corresponding boost converter (for 800V platforms) or buck converter (for 400V platforms) is used to adapt to the voltage platform, enabling fast charging at charging piles with different voltage platforms. This means that due to the existence of charging piles with different parameters on the market and the potential for different ambient temperatures during charging, additional boost / buck converters are needed to achieve charging functionality for different voltage charging piles, resulting in high costs. Furthermore, when facing charging piles with different parameters, there may be situations where the charging pile cannot fully utilize its charging capabilities, leading to slower charging speeds and a reduced user experience. In addition, in related technologies, when only one cell in the high-voltage battery pack is damaged, the entire pack cannot provide high-voltage power, causing the vehicle to become immobilized and posing a driving safety risk. On the other hand, the DC-DC (Direct Current-Direct Current) arrangement in the related technology's architecture means that when the relay is not closed, the vehicle's low-voltage load cannot use the energy of the high-voltage battery and relies solely on the vehicle's small battery. This results in a short duration for the low-voltage load, impacting the user experience. Furthermore, a single DC-DC failure can cause insufficient low-voltage power supply, potentially posing a significant driving risk.

[0044] In this disclosure, the 800V high-voltage platform or battery system typically refers to a battery pack / cell operating voltage range of 550V to 930V. The battery packs in these vehicles consist of more cells connected in series to achieve higher output voltages.

[0045] In this embodiment of the disclosure, the maximum output voltage of the 500V / 750V / 1000V charging pile is 500V / 750V / 1000V.

[0046] In this embodiment, the battery pack / battery array is a complete power system comprising multiple battery cells (cells) connected in series and parallel, and integrating a battery management system, structural components, thermal management, and safety protection components. It can be applied to electric vehicles, energy storage systems, consumer electronics, power tools, and other fields. The following embodiments use applications in electric vehicles / new energy vehicles as examples, but this disclosure is not limited to these applications.

[0047] Figure 1 This is a flowchart illustrating a control method according to an exemplary embodiment of the present disclosure. The control method provided in this embodiment can be used in vehicles, which can be new energy vehicles or new energy automobiles (pure electric / hybrid electric vehicles, i.e., pure electric vehicles / hybrid electric vehicles), such as electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs).

[0048] For example, the vehicle includes a battery pack and electrical equipment, with the battery pack electrically connected to the electrical equipment. The battery pack is the energy source for the electric vehicle and includes a first battery pack and a second battery pack, each including multiple battery cells. The first and second battery packs are connected in parallel or in series to provide battery packs with different output voltage levels. For example, when the first and second battery packs are connected in series, an 800V voltage is provided; when the first and second battery packs are connected in parallel, a 400V voltage is provided, but this disclosure is not limited to this.

[0049] For example, electrical equipment encompasses all electronic and electrical components, from driving the vehicle to providing comfort and safety, including but not limited to: electric drive units, including electric motors, that convert electrical energy supplied by the battery into mechanical energy to propel the vehicle forward; inverters that convert the DC power output from the battery into AC power suitable for use by the electric motor; DC-DC converters that reduce the voltage of the high-voltage battery to 12V for use by conventional electrical equipment in the vehicle, such as lighting, entertainment systems, and control modules; on-board chargers (OBCs) that allow the vehicle to charge directly from an external power source, converting AC power into DC power for storage in the battery; and auxiliary systems, including heating, ventilation, and air conditioning systems (HVAC), infotainment systems, navigation systems, and various sensors and controllers.

[0050] like Figure 1 As shown, the control method provided in this embodiment includes the following S110 to S130.

[0051] In S110, the connection between different interfaces of the double-pole double-throw switch is realized through the first control signal, realizing the conversion between series and parallel connection between multiple battery packs, wherein the battery pack includes a first battery pack and a second battery pack.

[0052] In S120, the opening and closing of the first and second switches are controlled by the second control signal, thereby realizing the charging and discharging control of the battery pack.

[0053] For example, the double-pole double-throw switch includes a first interface, a second interface, a third interface, and a fourth interface. The first, second, third, and fourth interfaces of the double-pole double-throw switch are respectively connected to the negative terminal of the first battery pack, the first terminal of the second switch, the positive terminal of the second battery pack, and the first terminal of the first switch. The second terminal of the first switch is connected to the positive terminal of the first battery pack, and the second terminal of the second switch is connected to the negative terminal of the second battery pack.

[0054] For example, the first end of the first switch is away from the first battery pack, and the first end of the second switch is away from the second battery pack.

[0055] For example, the connection between different interfaces of a double-pole double-throw switch is realized through a first control signal to achieve the conversion between series and parallel connections of multiple battery packs, including: controlling the first interface of the double-pole double-throw switch to connect with the third interface through the first control signal, so that the first battery pack and the second battery pack are connected in series; or, controlling the first interface of the double-pole double-throw switch to connect with the second interface and the third interface to connect with the fourth interface through the first control signal, so that the first battery pack and the second battery pack are connected in parallel.

[0056] For example, the opening and closing of the first switch and the second switch are controlled by the second control signal to achieve the charging and discharging control of the battery pack. This includes: when the first battery pack and the second battery pack are connected in series, the first switch, the second switch, and the seventh switch are controlled to close by the second control signal so that the first battery pack and the second battery pack connected in series provide a first voltage to the electric drive device. The first terminal of the seventh switch is connected to the input terminal of the electric drive device, and the second terminal of the seventh switch is connected to the first terminal of the first switch.

[0057] For example, controlling the opening and closing of the first and second switches via a second control signal to achieve charging and discharging control of the battery pack includes: when the first and second battery packs are connected in series, controlling the first, second, third, fourth, and seventh switches to close via the second control signal, so that a first charging device capable of providing a first charging voltage charges the first and second battery packs connected in series; wherein, the first end of the third switch is connected to the first end of the seventh switch, and the second end of the third switch is connected to the output end of the first charging device; the first end of the fourth switch is connected to the first end of the second switch, and the second end of the fourth switch is connected to the output end of the first charging device; the second end of the seventh switch is connected to the first end of the first switch.

[0058] For example, the opening and closing of the first and second switches are controlled by the second control signal to achieve the charging and discharging control of the battery pack, including: when the first battery pack and the second battery pack are connected in parallel, the second control signal is used to control the second switch and the seventh switch to close, so that the second battery pack provides a second voltage to the electric drive device; wherein, the first end of the seventh switch is connected to the input end of the electric drive device, and the second end of the seventh switch is connected to the fourth interface of the double-pole double-throw switch.

[0059] For example, controlling the opening and closing of the first and second switches via a second control signal to achieve charging and discharging control of the battery pack includes: when the first and second battery packs are connected in parallel, controlling the first, second, third, fourth, and seventh switches to close via the second control signal, and using a second charging device capable of providing a second charging voltage to charge the parallel first and second battery packs; wherein, the first end of the third switch is connected to the first end of the seventh switch, and the second end of the third switch is connected to the output end of the second charging device; the first end of the fourth switch is connected to the first end of the second switch, and the second end of the fourth switch is connected to the output end of the second charging device; the second end of the seventh switch is connected to the first end of the first switch.

[0060] For example, controlling the opening and closing of the first and second switches via a second control signal to control the charging and discharging of the battery pack includes: when the first and second battery packs are connected in series, controlling the first, second, third, and fourth switches and a control switch to close via the second control signal, so that the third charging voltage provided by the third charging device is reduced to a second voltage by the electric drive device, and then used to charge the first and second battery packs connected in parallel; wherein, the first end of the third switch is connected to the input end of the electric drive device, and the second end of the third switch is connected to the output end of the third charging device; the first end of the fourth switch is connected to the input end of the electric drive device and the first end of the second switch, respectively, and the second end of the fourth switch is connected to the output end of the third charging device; the first end of the control switch is connected to the first or third interface of the double-pole double-throw switch, and the second end of the control switch is connected to the output end of the electric drive device.

[0061] For example, it further includes: when the first battery pack and the second battery pack are connected in series, the first control signal controls the first switch, the second switch and the control switch to close, so as to use the electric drive device to heat the first battery pack and the second battery pack; wherein, the first end of the control switch is connected to the first interface or the third interface of the double-pole double-throw switch, and the second end of the control switch is connected to the output end of the electric drive device.

[0062] For example, it further includes: controlling the first switch and the second switch to close via the second control signal to provide load voltage to the load via at least one of the first converter and the second converter connected in parallel; wherein the first input terminal and the second input terminal of the first converter are respectively connected to the first terminal of the first switch and the second switch; the first input terminal and the second input terminal of the second converter are respectively connected to the second terminal of the first switch and the second switch; and the output terminals of the first converter and the second converter are both connected to the input terminal of the load.

[0063] For example, it further includes: when the first battery pack and the second battery pack are connected in series, the first switch and the second switch are controlled to be disconnected by the second control signal, so as to provide load voltage to the load by the second converter in the non-charging state and non-driving state; wherein the first input terminal and the second input terminal of the second converter are respectively connected to the second terminal of the first switch and the second switch; the output terminal of the second converter is connected to the input terminal of the load.

[0064] For example, a first battery pack and a second battery pack are controlled in series to provide a first voltage to the electric drive device. The first voltage is, for example, 800V, but this disclosure is not limited thereto.

[0065] For example, a first battery pack and a second battery pack are connected in series, and a first charging device capable of providing a first charging voltage is used to charge the first and second battery packs connected in series, wherein the first charging voltage is greater than or equal to a first voltage. For example, the first charging voltage is 1000V, but this disclosure is not limited thereto.

[0066] For example, in the event of a failure in the first or second battery pack, the first and second battery packs are connected in parallel, and a second voltage, less than the first voltage, is provided to the electric drive unit through the first or second battery pack that is not experiencing a failure. For example, the second voltage is 400V, but this disclosure is not limited thereto.

[0067] For example, a first battery pack and a second battery pack are controlled to be connected in parallel, and a second charging device capable of providing a second charging voltage is used to charge the first and second battery packs connected in parallel, wherein the second charging voltage is greater than or equal to a second voltage. For example, the second charging voltage is 500V or 750V, but this disclosure is not limited thereto.

[0068] For example, the first battery pack and the second battery pack are controlled to be connected in parallel. The third charging voltage provided by the third charging device is reduced to the second voltage by the electric drive device, and then the first battery pack and the second battery pack connected in parallel are charged. The third charging voltage is greater than the second voltage.

[0069] For example, the third charging voltage may be equal to or different from the second charging voltage. For example, the second charging voltage may be 500V or 750V, but this disclosure is not limited thereto.

[0070] For example, a first battery pack and a second battery pack are connected in series, and an electric drive device is used to heat the first battery pack and the second battery pack.

[0071] For example, a first battery pack and a second battery pack are controlled to be connected in series or in parallel to charge the first battery pack and the second battery pack or to drive an electric drive device. A load voltage, less than a first voltage, is provided to the load through at least one of a first converter and a second converter connected in parallel. For example, the load voltage is 48V.

[0072] For example, the first battery pack and the second battery pack are connected in series, and in the non-charging and non-driving state, the load voltage is provided to the load through the second converter.

[0073] It should be noted that the functions implemented above are respectively called dual-packet series drive, dual-packet series DC direct charging, dual-packet parallel limp-drive, dual-packet parallel DC direct charging, dual-packet parallel buck charging, dual-source single-channel low-voltage power supply, and low-voltage constant power supply. Among them, "dual pack" refers to the first battery pack and the second battery pack; "series" and "parallel" refer to the first battery pack and the second battery pack being connected in series or in parallel; "drive" refers to the first battery pack and the second battery pack being used to drive the electric drive device; "direct charging" refers to the charging pile's output voltage directly charging the first battery pack and the second battery pack; "buck charging" refers to the charging pile's output voltage being stepped down before charging the first battery pack and the second battery pack; "limp-drive" refers to driving the electric drive device through one of the first battery pack or the second battery pack; "dual-source single-channel low-voltage power supply" refers to supplying power to the low-voltage load through two parallel first converters and second converters; and "low-voltage constant power supply" refers to supplying power to the low-voltage load regardless of whether the vehicle is in a driving state, charging state, or stationary state (parking state).

[0074] In this embodiment of the disclosure, "low voltage" and "high voltage" are relative terms. For a vehicle, the voltage required to drive the electric drive device to make the vehicle run is generally higher than the voltage required by other loads on the vehicle, such as small refrigerators, air conditioners, communication devices, smart keys, etc. Therefore, the voltage that drives the vehicle is called high voltage, such as 800V or 400V, while other loads are called low voltage loads, such as 12V, 40V, etc.

[0075] The control method provided in this disclosure can execute any one or more of the above eight functions, that is, it can implement any one control function, such as dual-packet series drive, dual-packet series DC direct charging, dual-packet parallel limp-drive, dual-packet parallel DC direct charging, dual-packet parallel buck charging, dual-source low-voltage power supply, or low-voltage constant power supply; it can also implement any two of these control functions, for example, it can implement both dual-packet series drive and dual-packet parallel limp-drive; it can also implement any three, four, five, six, or seven of these control functions; or it can implement all eight of the above control functions. Which control function is used at a specific time or in a specific scenario can be comprehensively determined based on the vehicle's state, the type and parameters of the charging pile, the ambient temperature, user needs, etc., and this disclosure does not limit this.

[0076] It is understood that this disclosure does not limit the execution order of the above 8 functions, and the execution order can be determined according to the actual application scenario.

[0077] Furthermore, this disclosure provides a vehicle battery charging and discharging control circuit, comprising: multiple battery packs, the battery packs including a first battery pack and a second battery pack; a switching circuit for controlling the series or parallel connection between the multiple battery packs; wherein the switching circuit includes a double-pole double-throw switch, a first switch and a second switch; the second terminal of the first switch is connected to the positive terminal of the first battery pack, and the second terminal of the second switch is connected to the negative terminal of the second battery pack; and an electric drive device connected to the battery packs to drive the vehicle.

[0078] For example, the double-pole double-throw switch includes a first interface, a second interface, a third interface, and a fourth interface; the first interface, the second interface, the third interface, and the fourth interface of the double-pole double-throw switch are respectively connected to the negative terminal of the first battery pack, the first terminal of the second switch, the positive terminal of the second battery pack, and the first terminal of the first switch.

[0079] For example, when the first interface of the double-pole double-throw switch is connected to the third interface, the first battery pack and the second battery pack are connected in series; or, when the first interface of the double-pole double-throw switch is connected to the second interface and the third interface is connected to the fourth interface, the first battery pack and the second battery pack are connected in parallel.

[0080] For example, the switching circuit further includes a seventh switch; when the first battery pack and the second battery pack are connected in series, the first switch, the second switch and the seventh switch are closed, and the first battery pack and the second battery pack connected in series provide a first voltage to the electric drive device; wherein, the first end of the seventh switch is connected to the input end of the electric drive device, and the second end of the seventh switch is connected to the first end of the first switch.

[0081] For example, the switching circuit further includes a third switch and a fourth switch; when the first battery pack and the second battery pack are connected in series, the first switch, the second switch, the third switch, the fourth switch, and the seventh switch are closed, and a first charging device capable of providing a first charging voltage charges the first battery pack and the second battery pack connected in series; wherein, the first end of the third switch is connected to the first end of the seventh switch, and the second end of the third switch is connected to the output end of the first charging device; the first end of the fourth switch is connected to the first end of the second switch, and the second end of the fourth switch is connected to the output end of the first charging device; the second end of the seventh switch is connected to the first end of the first switch.

[0082] For example, when the first battery pack and the second battery pack are connected in parallel and the first battery pack fails, the second switch and the seventh switch are closed, and the second battery pack provides a second voltage to the electric drive device; wherein, the second end of the seventh switch is connected to the fourth interface of the double-pole double-throw switch.

[0083] For example, when the first battery pack and the second battery pack are connected in parallel, the first switch, the second switch, the third switch, the fourth switch, and the seventh switch are closed, and the second charging device that can provide the second charging voltage charges the first battery pack and the second battery pack connected in parallel; wherein, the second end of the third switch is connected to the output end of the second charging device; and the second end of the fourth switch is connected to the output end of the second charging device.

[0084] For example, the switching circuit further includes a control switch; when the first battery pack and the second battery pack are connected in series, the first switch, the second switch, the third switch, the fourth switch, and the control switch are closed, and the third charging voltage provided by the third charging device is reduced to the second voltage by the electric drive device to charge the first battery pack and the second battery pack connected in parallel; wherein, the second end of the third switch is connected to the output end of the third charging device; the second end of the fourth switch is connected to the output end of the third charging device; the first end of the control switch is connected to the first or third interface of the double-pole double-throw switch, and the second end of the control switch is connected to the output end of the electric drive device.

[0085] For example, when the first battery pack and the second battery pack are connected in series, the first switch, the second switch, and the control switch are closed, and the electric drive device heats the first battery pack and the second battery pack.

[0086] For example, the electric drive device includes a first electric drive device and a second electric drive device; the control switch includes a fifth switch and a sixth switch; wherein, the input terminals of the first electric drive device and the second electric drive device are both connected to the input terminals of the electric drive devices; the output terminal of the first electric drive device is connected to the second terminal of the fifth switch, and the first terminal of the fifth switch is connected to the first or third interface of the double-pole double-throw switch; the output terminal of the second electric drive device is connected to the second terminal of the sixth switch, and the first terminal of the sixth switch is connected to the first or third interface of the double-pole double-throw switch.

[0087] For example, it also includes a filtering module, wherein the first ends of the fifth switch and the sixth switch are both connected to the first end of the filtering module, and the second end of the filtering module is connected to the first or third interface of the double-pole double-throw switch.

[0088] For example, it further includes: a first converter, the first input terminal and the second input terminal of the first converter being connected to the first terminals of the first switch and the second switch, respectively; a second converter, the first input terminal and the second input terminal of the second converter being connected to the second terminals of the first switch and the second switch, respectively; the output terminals of the first converter and the second converter are both connected to the input terminals of the load; wherein the first switch and the second switch are closed to provide a load voltage to the load through at least one of the first converter and the second converter connected in parallel.

[0089] For example, it also includes: a second converter, the first input terminal and the second input terminal of the second converter being connected to the second terminals of the first switch and the second switch, respectively; the output terminal of the second converter being connected to the input terminal of the load; the first interface of the double-pole double-throw switch being connected to the third interface; the first battery pack and the second battery pack being connected in series; the first switch and the second switch being disconnected; and in the non-charging state and non-driving state, the second converter being used to provide load voltage to the load.

[0090] Wherein, the first charging voltage is greater than or equal to the first voltage, the second voltage is less than the first voltage, the second charging voltage is greater than or equal to the second voltage, the third charging voltage is greater than the second voltage, and the load voltage is less than the first voltage.

[0091] For example, it also includes: a third connector, the inner positive interface of the third connector being connected to the second end of the third switch, the inner negative interface of the third connector being connected to the second end of the fourth switch, and the outer interface of the third connector being connected to the output end of the first charging device, the second charging device, or the third charging device.

[0092] For example, it also includes: a second connector, the inner positive interface of the second connector being connected to the first end of the third switch and the first end of the seventh switch respectively, the inner negative interface of the second connector being connected to the first end of the fourth switch and the first end of the second switch respectively, and the outer interface of the second connector being connected to the input end of the electric drive device.

[0093] For example, the electric drive device used in the embodiments of this disclosure can be a dual electric drive, that is, it can be used to drive two wheels of a vehicle. For example, a first electric drive device and a second electric drive device can drive one of the two rear wheels of the vehicle, respectively. By using a dual electric drive, greater driving force can be provided, and more electrical energy can be stored and released during the battery self-heating process, thereby improving the heating effect. However, this disclosure is not limited to this. In other embodiments, a single electric drive can also be used, that is, one electric drive device drives one wheel of the vehicle, and the vehicle may include multiple electric drive devices.

[0094] For example, the first electric drive device and the second electric drive device respectively include a first motor and a second motor, and the neutral point lead of the first motor and the second motor respectively serve as the output terminals of the first electric drive device and the second electric drive device.

[0095] For example, the vehicle battery charging and discharging control circuit further includes: a first connector, the second ends of the fifth switch and the sixth switch are respectively connected to the first inner interface and the second inner interface of the first connector, and the first outer interface and the second outer interface of the first connector are respectively connected to the output terminals of the first electric drive device and the second electric drive device.

[0096] For example, the vehicle battery charging and discharging control circuit further includes: a fourth connector, wherein the positive outputs of the first converter and the second converter are connected in parallel to the inner positive interface of the fourth connector; the negative outputs of the first converter and the second converter are connected in parallel to the inner negative interface of the fourth connector; and the outer positive interface and the outer negative interface of the fourth connector are respectively connected to the positive input terminal and the negative input terminal of the load.

[0097] For example, one or more of the first switch, second switch, third switch, fourth switch, control switch (including fifth switch and sixth switch), and seventh switch in the embodiments of this disclosure may be a relay.

[0098] In this disclosure, "connection" includes direct connection and indirect connection. That is, if it is described as "A and B are connected", then A and B can be directly connected without any other components in between; or they can be indirectly connected with other components between A and B; it includes wireless connection and wired connection; it can be a communication connection or a circuit connection.

[0099] The following is combined with Figure 2 An example is given of the vehicle battery charging and discharging control circuit provided in the embodiments of this disclosure. Figure 2 The vehicle battery charging and discharging control circuit shown is a high-voltage architecture capable of switching between series and parallel connections of dual battery packs. For example, it can be used as a high-voltage architecture for new energy vehicles capable of switching between series and parallel connections of dual battery packs. Exemplarily, this vehicle battery charging and discharging control circuit 100 can also be referred to as REESS (Renewable Energy and Energy Storage System).

[0100] Figure 2 This is an overview of the high-voltage architecture topology provided in the embodiments of this disclosure, and the figure includes the main components of the high-voltage architecture provided in the embodiments of this disclosure. Figure 2 As shown, the vehicle battery charging and discharging control circuit 100 mainly includes: battery pack 1 (first battery pack), battery pack 2 (second battery pack), main positive relay K1 (first switch), main negative relay K2 (second switch), double-pole double-throw switch (DPDT), charging circuit positive relay K3 (third switch), charging circuit negative relay K4 (fourth switch), buck charging circuit (circuit containing relays S1 (fifth switch) and S2 (sixth switch)), charging mode control relay S3 (seventh switch), DC-DC 1 (first converter), and DC-DC 2 (second converter). Other necessary fuses and other components in the circuit architecture are not listed. Figure 2 The bid was successful.

[0101] The step-down charging circuit starts from the neutral point lead of the dual motor (i.e., the two output terminals of the dual electric drive 200), connects to the battery pack (referring to the connection of the first connector HV_Pg1, which is a high-voltage connector), passes through relays S1 and S2 and the filter module, and then goes to the series port of the DPDT (first interface P1 or third interface P3). This circuit also supports the dual-pack pulse low-frequency self-heating function.

[0102] like Figure 2 As shown, the double-pole double-throw switch 110 includes four interfaces: the first interface P1 and the third interface P3 are series interfaces, and the second interface P2 and the fourth interface P4 are parallel interfaces. The series interface P1 of the double-pole double-throw switch 110 is directly connected to the negative terminal of battery pack 1, and the series interface P3 is directly connected to the positive terminal of battery pack 2. The parallel interface P2 of the double-pole double-throw switch is connected to the side of the main negative relay K2 furthest from battery pack 2, and the parallel interface P4 of the double-pole double-throw switch is connected to the side of the main positive relay K1 furthest from battery pack 1.

[0103] The positive terminal of battery pack 1 is connected to one end of the main positive relay K1, and the negative terminal of battery pack 1 is connected to the series interface P1 of the double-pole double-throw switch 110. The positive terminal of battery pack 2 is connected to the series interface P3 of the double-pole double-throw switch 110, and the negative terminal of battery pack 2 is connected to one end of the main negative relay K2. One end of the step-down charging circuit relays S1 and S2 is connected to the inside of the high-voltage connector HV_Pg1 (first connector), and the other end is connected to one side of the filter module 130. The other side of the filter module 130 is connected to the series interface P1 or P3 of the double-pole double-throw switch 110.

[0104] One end of the charging mode control relay S3 is connected to the end of the main positive relay K1 that is furthest from the battery pack 1; the other end of the charging mode control relay S3 is connected to the inside of the high voltage connector HV_Pg2 (second connector) and is also connected to one end of the charging circuit positive relay K3.

[0105] The other end of the positive relay K3 in the charging circuit is connected to the positive terminal inside the high-voltage connector HV_Pg3 (third connector). One end of the negative relay K4 in the charging circuit is connected to the side of the main negative relay K2 away from battery pack 2; the other end of the negative relay K4 in the charging circuit is connected to the negative terminal inside the high-voltage connector HV_Pg3.

[0106] The positive input terminal (I1+) of DC-DC 1 is connected to the end of the main positive relay K1 furthest from battery pack 1; the negative input terminal (I1-) of DC-DC 1 is connected to the end of the main negative relay K2 furthest from battery pack 2. The positive input terminal (I2+) of D2-DC 2 is connected to the positive terminal of battery pack 1; the negative input terminal (I2-) of D2-DC 2 is connected to the negative terminal of battery pack 2. The positive output terminal (O1+) of DC-DC 1 and the positive output terminal (O2+) of D2-DC 2 are connected in parallel to the positive terminal of the inner side of the low-voltage connector LV_Pg1 (fourth connector) (taking +48V as an example); the negative output terminal (O1-) of DC-DC 1 and the negative output terminal (O2-) of D2-DC 2 are connected in parallel to the negative terminal of the inner side of the low-voltage connector LV_Pg1 (taking GND, i.e., ground, as an example).

[0107] For example, the outer interface of the high-voltage connector HV_Pg1 is connected to the two motor neutral interfaces of the dual electric drive 200. The outer interface of the high-voltage connector HV_Pg2 is connected to the DC input interface of the dual electric drive 200. The outer interface of the high-voltage connector HV_Pg3 is connected to the charging port 300 interface. The outer interface of the low-voltage connector HV_Pg3 is connected to the low-voltage load 400 interface.

[0108] For example, the charging port 300 can be provided by any one of the first charging device, the second charging device, and the third charging device, that is, it can be the output terminal of any one of the charging devices.

[0109] For example, the low-voltage system of an electric vehicle (e.g., 12V / 48V) needs to power various high-power functions, such as: Sentry mode: real-time monitoring of the vehicle's surroundings (e.g., cameras, sensors), requiring continuous low-power operation; In-vehicle remote communication: 5G networking, OTA upgrades, etc., require the communication module to be constantly on; Smart key system: keyless entry via wireless communication (e.g., BLE, NFC), requiring continuous power; Other smart devices: such as in-vehicle refrigerators, air purifiers, and vehicle infotainment system standby. Traditional 12V lead-acid batteries have limited capacity (typically around 50Ah), only supporting short periods of low-voltage power supply. If the vehicle remains stationary for an extended period (e.g., after parking), the small battery may deplete, leading to functional failure (e.g., inability to start the vehicle).

[0110] Regarding low-voltage power supply requirements, with the increasing number of functions and scenarios requiring low-voltage power (sentinel mode, in-vehicle remote communication, smart keys, etc.), the demand for low-voltage power supply in vehicles is growing, and traditional small battery power supply can no longer meet current low-voltage power needs. Therefore, in addition to controlling low-voltage power consumption, the industry also provides low-voltage power supply by increasing the capacity of small batteries or statically supplying high voltage to the entire vehicle. However, the former leads to an increase in the cost of small batteries, while the latter poses potential high-voltage safety risks. For example, statically supplying high voltage to the entire vehicle, such as continuing to provide 800V after parking, allows the DC-DC converter 1 configured outside the first switch K1 and the second switch K2 to continue supplying power to low-voltage loads. However, this poses high-voltage safety risks to the vehicle. For example, there is a collision risk; in the event of a collision or malfunction, the high-voltage system may experience a short circuit or fire.

[0111] This embodiment of the present disclosure adds an additional DC-DC 2 inside the first switch K1 and the second switch K2. In this way, even if K1 and K2 are disconnected after the machine is stopped, power can still be supplied to the low-voltage load, while reducing safety risks.

[0112] For example, DC-DC 1 and DC-DC 2 can be configured simultaneously inside and outside the first switch K1 and the second switch K2 to achieve a parallel redundancy design. The two DC-DCs can serve as backups for each other. When one DC-DC fails due to overheating, short circuit, or aging, the other DC-DC can immediately take over the power supply, preventing power outages in the low-voltage system. Redundancy configuration improves power supply continuity, and automatic switching in the event of a single DC-DC failure ensures uninterrupted system operation.

[0113] For example, if dual backup is not considered, it is also possible to include only the inner DC-DC 2, which can also achieve low-voltage constant power supply.

[0114] For example, only the outer DC-DC 1 may be included. The high-voltage architecture configures DC-DC 1 outside of K1 and K2. After the high voltage is applied to the vehicle (K1 and K2 are closed), power can be drawn from the high-voltage battery (first battery pack and / or second battery pack) through DC-DC 1 to power the low-voltage load.

[0115] This disclosed embodiment can achieve single / dual-packet switching and voltage platform switching through the combination of DPDT, K1, and K2 switch states, thus satisfying drive and charge / discharge functions. The following is in conjunction with... Figures 3 to 8 It displays different functions, the corresponding component statuses under different functions, and the corresponding usage scenarios.

[0116] It is understood that the first control signal and / or the second control signal in the embodiments of this disclosure may include one or more control signals issued by the controller or control device. Each control signal is used to control the closing or opening of the corresponding switch or relay. By combining the closing or opening of multiple switches or relays, any function among dual-packet series drive, dual-packet series DC direct charging, dual-packet parallel limp drive, dual-packet parallel DC direct charging, dual-packet parallel buck charging, dual-source low-voltage power supply, and low-voltage constant power supply can be realized.

[0117] Figure 3 This is a schematic diagram illustrating a dual-packet serial drive according to an exemplary embodiment of the present disclosure. Figure 3 As shown, this example uses the dual-packet series 800V drive function. This function is used when the vehicle is in normal driving mode, operating at an 800V voltage platform, and the dual electric drive system is running normally. In this function, the DPDT is in series, meaning the first interface P1 and the third interface P3 are connected, and the battery operates in series mode; K1 and K2 are closed, S3 is closed, S1 and S2 are open, and K3 and K4 are open, with the current flow as follows: Figure 3 As indicated by the middle arrow.

[0118] For example, in Figure 3 In this system, both DC-DC 1 and DC-DC 2 receive low-voltage power from an 800V voltage platform.

[0119] Figure 4 This is a schematic diagram illustrating a dual-pack series DC direct charging according to an exemplary embodiment of this disclosure. Figure 4As shown, this example uses a dual-pack series-connected 1000V charging pile for DC direct charging. This function is used when a vehicle is charged using a 1000V charging pile, and the vehicle is operating at an 800V voltage platform, with the 1000V charging pile directly providing DC charging. Under this function, the DPDT is in series, K1 and K2 are closed, the battery operates in series mode, K3 and K4 are closed, S3 is closed, and S1 and S2 are open. The current flow is as follows: Figure 4 As indicated by the middle arrow.

[0120] For example, in Figure 4 In this system, both DC-DC 1 and DC-DC 2 receive low-voltage power from an 800V voltage platform.

[0121] Figure 5 This is a schematic diagram illustrating a dual-packet parallel limp drive according to an exemplary embodiment of this disclosure. Figure 5 As shown, this function is used when either battery pack 1 or battery pack 2 fails (e.g., single-cell thermal runaway). The system closes K1 (for battery pack 2 failure) or K2 (for battery pack 1 failure), and the DPDT switches to parallel operation. The vehicle operates on a 400V voltage platform, with the unfailed battery pack supplying power to the external high-voltage system independently, achieving limp-drive. Compared to previous architectures that could only stop in the same situation, the architecture provided in this disclosure supports brief limp-drive, allowing the vehicle to escape risk and protecting user safety.

[0122] Figure 5 Taking a battery pack 1 malfunction as an example, under this function, the DPDT is in parallel connection, that is, the first interface P1 is connected to the second interface P2, and the third interface P3 is connected to the fourth interface P4; K1 is open, K2 is closed, the battery works in parallel mode, S3 is closed, S1 and S2 are open, K3 and K4 are open, and the current flow is as follows. Figure 5 As indicated by the middle arrow.

[0123] For example, in Figure 5 In this circuit, DC-DC 1 receives low-voltage power from the 400V battery pack 2. DC-DC 2 is not operational.

[0124] Figure 6 This is a schematic diagram of a dual-pack parallel DC direct charging system according to an exemplary embodiment of this disclosure. This function is used when a vehicle is charged using a 750V or 500V charging station. The vehicle is operating at a 400V voltage platform, and the 750V or 500V charging station can directly perform DC charging. In this function, the DPDT is in parallel connection, K1 and K2 are closed, the battery operates in parallel mode, K3 and K4 are closed, S3 is closed, and S1 and S2 are open. The current flow is as follows: Figure 6 As indicated by the middle arrow.

[0125] For example, in Figure 6In this circuit, DC-DC 1 and DC-DC 2 obtain low-voltage power from 400V battery pack 2 and battery pack 1, respectively.

[0126] According to the above Figures 3 to 6 Functionally, the high-voltage architecture designed in this embodiment utilizes two relays (K1 and K2) and one double-pole double-throw switch to enable series-parallel switching of the two battery packs. This facilitates vehicle voltage platform switching, meeting charging and discharging requirements under different voltage platforms and improving charging compatibility. Simultaneously, the dual-pack parallel limp-drive function allows the user to limp-drive the vehicle to escape hazardous scenarios in the event of a single battery pack failure, enhancing user safety.

[0127] Figure 7 This is a schematic diagram of a dual-pack parallel buck charging system according to an exemplary embodiment of this disclosure. The application scenario for this function is when a vehicle is charged using a 750V or 500V charging station. With the vehicle operating at a 400V voltage platform, the 750V or 500V charging station performs buck charging through a buck charging circuit, increasing the charging rate without requiring an additional buck converter, thus reducing costs.

[0128] One scenario for improving charging speed mentioned above involves using a 750V, 180kW charging pile. Current industry solutions typically involve 800V platform vehicles using a 120kW boost charger, with a charging time of approximately 36 minutes. Using the architecture provided in this disclosure, through dual-packet parallel connection and buck charging, the charging time is reduced to 24 minutes, a reduction of 12 minutes, providing users with a better charging experience. Specifically, while maintaining the charging power of the charging pile, reducing the charging voltage increases the charging current, thereby fully utilizing the charging pile's power and increasing charging speed.

[0129] like Figure 7 As shown, under this function, the DPDT is in parallel connection, K1 and K2 are closed, the battery operates in parallel mode, K3 and K4 are closed, S3 is open, S1 and S2 are closed, and the current flow is as follows. Figure 7 As indicated by the middle arrow.

[0130] For example, the dual electric drive 200 in this embodiment includes a first motor and a second motor, an upper arm switch and a lower arm switch, and an energy storage element (e.g., a capacitor). By controlling the conduction duration of the upper arm switch and the lower arm switch in the dual electric drive, the 750V charging voltage output by the charging pile can be reduced to 400V, thereby controlling the magnitude of the charging current.

[0131] This disclosure embodiment can also achieve dual-pack series pulse self-heating through dual electric drive. This function is used in scenarios such as low-temperature vehicle start-up, before or during low-temperature charging, to heat the power battery (including the first and second battery packs). For example, an ambient temperature sensor can be used to detect the ambient temperature; when the detected ambient temperature is below a temperature threshold, it is determined that a low-temperature environment is present, and self-heating is activated. The magnitude of this temperature threshold can be set according to the actual scenario, and this disclosure does not limit it.

[0132] In this function, the DPDT is in series, K1 and K2 are closed, the battery operates in series mode, and S1 and S2 are closed. During charging, K3 and K4 are closed, and S3 is open. During non-charging, K3 and K4 are open, and S3 is closed. The current flow direction changes and is complex, so it is not shown here. For example, the energy storage elements in the dual electric drive 200 can alternately charge and discharge battery pack 1 and battery pack 2. This alternation cycle can be determined by a control signal sent by a controller or control device, thereby achieving self-heating. For instance, first, battery pack 1 is connected to the dual electric drive, allowing battery pack 1 to discharge while the dual electric drive stores energy (or a single electric drive can store energy, but the dual electric drive stores more energy); then, battery pack 2 is connected to the dual electric drive, and the dual electric drive charges battery pack 2. This alternation is repeated to achieve self-heating. The dual electric drive has upper and lower arm switches, which control the energy storage and release of the dual electric drive.

[0133] For example, under the architecture provided in this disclosure embodiment, this function can achieve a battery temperature rise rate of approximately 1.5°C / min (affected by battery type, harness allowable current, etc.). It can quickly raise the battery temperature, improving battery performance in low-temperature scenarios.

[0134] According to the above Figure 7 The description of the dual-pack series pulse self-heating function, combined with the aforementioned voltage platform switching function, can improve the charging rate when using charging piles with different voltages and power (such as the aforementioned 750V, 180kW charging pile), improve battery performance in low-temperature environments, achieve full-scenario battery charging and discharging capabilities, and enhance user experience.

[0135] For low-voltage power supply, this embodiment of the present disclosure achieves dual-source low-voltage power supply and low-voltage constant power supply by placing two DC-DC converters separately inside and outside the circuit, eliminating the need for reverse pre-charging of small batteries. The following examples illustrate this. Figure 8 For example.

[0136] Figure 8 This is a schematic diagram illustrating a dual-source, single-channel low-voltage power supply according to an exemplary embodiment of this disclosure. For example... Figure 8As shown, this example uses a dual-source, single-channel low-voltage 48V power supply. This function is used during normal vehicle operation or charging (regardless of the specific charging type, i.e., any of the above circuits can be used). The high-voltage lines of the two DC-DC converters are connected to the inner side (near the battery pack side) and the outer side (near the load side) of relays K1 and K2, respectively, while the low-voltage lines are connected together and output to the outside. When one DC-DC converter fails and cannot operate, the other DC-DC converter can continue to provide low-voltage power, thus achieving dual-source backup.

[0137] Figure 8 This demonstrates the current flow of the two DC-DC low-voltage power distribution units under normal vehicle driving conditions. At this time, the DPDT is in series, K1 and K2 are closed, the battery is working in series mode, K3 and K4 are open, S3 is closed, and S1 and S2 are open.

[0138] In this embodiment of the disclosure, the low-voltage constant power supply function is mainly for the scenario of a vehicle parking under high voltage, in which the DPDT is in series and relays K1 and K2 are disconnected. According to Figure 8 It can be observed that since the high-voltage line of DC-DC 2 is connected to the inside of relays K1 and K2, that is, the positive terminal of battery pack 1 and the negative terminal of battery pack 2, when the two battery packs are connected in series to form a large battery pack, DC-DC 2 can draw power from the entire large battery pack to supply power to low-voltage loads. This function enables the low voltage to remain in sentinel mode for an extended period when the vehicle is not using high voltage, allowing loads such as small refrigerators to be powered for extended periods without the need for small batteries to provide low-voltage power. This reduces the performance and capacity requirements of small capacitors, thereby lowering costs.

[0139] On the one hand, the high-voltage architecture designed in this embodiment uses two relays and one double-pole double-throw switch to achieve series-parallel switching of the two battery packs, thereby realizing the vehicle voltage platform switching function, meeting the charging and discharging functions under different voltage platforms, and improving charging compatibility. On the other hand, the high-voltage architecture designed in this embodiment supports pulse low-frequency self-heating and buck charging. Combined with the voltage platform switching function, it can improve charging efficiency in all scenarios and enhance user experience. Through buck charging and pulse self-heating circuits, combined with the voltage platform switching function, the battery charging and discharging capabilities can be improved in low-temperature and different voltage platform charging pile scenarios, enhancing the user charging experience. In addition, the high-voltage architecture designed in this embodiment uses two DC-DC converters that can adapt to different voltage platforms, arranged separately inside and outside, to achieve dual-source low-voltage power supply and low-voltage constant power supply functions. This can improve the redundancy of low-voltage power supply, enhance vehicle safety, and reduce the capacity requirements of small batteries, thus reducing costs. The high-voltage architecture designed in this embodiment satisfies both the high-voltage safety redundancy and low-voltage safety redundancy of the vehicle, and can also improve the charging experience of the vehicle in different scenarios. In some embodiments, the dual-pack parallel limp-drive function enables the user to limp-drive the vehicle to escape a risky scenario in the event of a single battery pack failure, thereby achieving high-voltage redundancy in the vehicle and improving the safety of the user's vehicle use.

[0140] Furthermore, this disclosure also provides a vehicle battery charging and discharging control device, including the vehicle battery charging and discharging control circuit as described in any of the above embodiments.

[0141] For example, it also includes: a controller connected to the switching circuit, the controller being used to control the switching circuit.

[0142] Furthermore, this disclosure also provides a vehicle, including: a vehicle battery charging and discharging control device as described in any of the above embodiments; the vehicle battery charging and discharging control device supplies electrical energy to the electric drive device, or charges the first battery pack and the second battery pack connected in parallel or in series.

[0143] For example, it also includes: a load, which obtains load voltage from the first battery pack and / or the second battery pack via a first converter and / or a second converter.

[0144] Figure 9 This is a block diagram illustrating a vehicle battery charging and discharging control device according to an exemplary embodiment of this disclosure. Figure 9 As shown, the vehicle battery charging and discharging control device includes a battery pack 501 and a controller 503. The battery pack 501 can supply power to the electrical device 502. The battery pack 501 includes, for example, the first battery pack and the second battery pack described above.

[0145] like Figure 9As shown, the vehicle battery charging and discharging control device may also include a controller 503. The controller 503 is connected to a switching circuit, and the controller is used to control the switching circuit to connect the first battery pack and the second battery pack in parallel or in series; and to provide a first voltage to the electric drive device by the series-connected first battery pack and the second battery pack; or to charge the series-connected first battery pack and the second battery pack by a first charging device capable of providing the first charging voltage; or, in the event of a failure of the first battery pack or the second battery pack, to provide a second voltage to the electric drive device by the parallel-connected first battery pack or the second battery pack that has not failed; or, to charge the parallel-connected first battery pack and the second battery pack by a second charging device capable of providing the second charging voltage; or, to charge the parallel-connected first battery pack and the second battery pack by a third charging voltage provided by a third charging device after being reduced to the second voltage by the electric drive device; or, to heat the series-connected first battery pack and the second battery pack by the electric drive device; or, to charge or drive the electric drive device by the series-connected first battery pack and the second battery pack, and to provide a load voltage to the load by at least one of the parallel-connected first converter and the second converter; or, in a non-charging and non-driving state, to provide a load voltage to the load by the second converter and the series-connected first battery pack and the second battery pack.

[0146] It is understandable that the aforementioned controller can be integrated into the vehicle controller or communicate with other controllers such as the vehicle controller to obtain relevant information and data in order to achieve the above functions.

[0147] Figure 10 This is a frame of a vehicle shown according to an exemplary embodiment of the present disclosure. Figure 1 .like Figure 10 As shown, the vehicle may include a vehicle battery charge / discharge control device 901 and an electrical device 502. For example, the electrical device 502 may include the aforementioned electric drive unit. The vehicle battery charge / discharge control device 901 supplies electrical energy to the electric drive unit, or charges the first battery pack and the second battery pack connected in parallel or series.

[0148] For example, the electrical equipment 502 may also include a load that obtains load voltage from the first battery pack and / or the second battery pack via a first converter and / or a second converter.

[0149] It should be noted that the acquisition, storage, use, and processing of information or data in this disclosed technical solution comply with the relevant provisions of national laws and regulations.

[0150] The specific manner in which the controller executes in the above embodiments has been described in detail in the embodiments related to the method, and will not be elaborated here.

[0151] Figure 11 This is a frame of a vehicle 1000 shown according to an exemplary embodiment. Figure 2 For example, vehicle 1000 can be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles. Vehicle 1000 can be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0152] Reference Figure 11 The vehicle 1000 may include various subsystems, such as an infotainment system 1010, a perception system 1020, a decision control system 1030, a drive system 1040, a computing platform 1050, and a battery management system 1060. The vehicle 1000 may also include more or fewer subsystems, and each subsystem may include multiple components. Furthermore, each subsystem and component of the vehicle 1000 can be interconnected via wired or wireless means.

[0153] In some embodiments, the infotainment system 1010 may include a communication system, an entertainment system, and a navigation system, etc.

[0154] The perception system 1020 may include several types of sensors for sensing information about the environment surrounding the vehicle 1000. For example, the perception system 1020 may include a global positioning system (which may be a GPS system, a BeiDou system, or another positioning system), an inertial measurement unit (IMU), a lidar, a millimeter-wave radar, an ultrasonic radar, and a camera device.

[0155] The decision control system 1030 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0156] The drive system 1040 may include components that provide powered motion to the vehicle 1000. In one embodiment, the drive system 1040 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of internal combustion engines, electric motors, and compressed air engines. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0157] Some or all of the functions of the vehicle 1000 are controlled by a computing platform 1050. The computing platform 1050 may include at least one processor 1051 and a memory 1052, the processor 1051 being able to execute instructions 1053 stored in the memory 1052.

[0158] The processor 1051 can be any conventional processor, such as a commercially available CPU. The processor may also include, for example, a Graphic Processing Unit (GPU), a Field Programmable Gate Array (FPGA), a System on Chip (SOC), an Application Specific Integrated Circuit (ASIC), or a combination thereof.

[0159] The memory 1052 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0160] In addition to instruction 1053, memory 1052 can also store data, such as road maps, route information, vehicle position, direction, speed, and other data. The data stored in memory 1052 can be used by computing platform 1050.

[0161] In this embodiment of the disclosure, processor 1051 may execute instruction 1053 to complete all or part of the steps of the above method.

[0162] In this embodiment of the disclosure, the battery management system 1060 is provided with a vehicle battery charging and discharging control device provided in this embodiment of the disclosure to control the vehicle battery pack 501.

[0163] In some embodiments of this disclosure, a non-transitory computer-readable storage medium is provided, which, when the instructions in the storage medium are executed by the processor of an electronic device, enables the electronic device to perform the control method described above.

[0164] In some embodiments of this disclosure, a computer program product is provided, including a computer program that, when executed by a processor, implements the control method described above.

[0165] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0166] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A vehicle battery charge-discharge control circuit characterized by comprising: include: Multiple battery packs, the battery packs including a first battery pack and a second battery pack; A switching circuit is provided for controlling the series or parallel connection of multiple battery packs; wherein the switching circuit includes a double-pole double-throw switch, a first switch, and a second switch; the second terminal of the first switch is connected to the positive terminal of the first battery pack, and the second terminal of the second switch is connected to the negative terminal of the second battery pack. An electric drive unit is connected to the battery pack to drive the vehicle.

2. The circuit of claim 1, wherein, The double-pole double-throw switch includes a first interface, a second interface, a third interface, and a fourth interface; The first, second, third, and fourth interfaces of the double-pole double-throw switch are respectively connected to the negative terminal of the first battery pack, the first terminal of the second switch, the positive terminal of the second battery pack, and the first terminal of the first switch.

3. The circuit of claim 2, wherein, When the first and third interfaces of the double-pole double-throw switch are connected, the first battery pack and the second battery pack are connected in series; or... When the first interface of the double-pole double-throw switch is connected to the second interface, and when the third interface is connected to the fourth interface, the first battery pack and the second battery pack are connected in parallel.

4. The circuit of claim 3, wherein, The switching circuit also includes a seventh switch; When the first battery pack and the second battery pack are connected in series, the first switch, the second switch and the seventh switch are closed, and the first battery pack and the second battery pack connected in series provide a first voltage to the electric drive device; The first end of the seventh switch is connected to the input end of the electric drive device, and the second end of the seventh switch is connected to the first end of the first switch.

5. The circuit of claim 4, wherein, The switching circuit also includes a third switch and a fourth switch; When the first battery pack and the second battery pack are connected in series, the first switch, the second switch, the third switch, the fourth switch and the seventh switch are closed, and the first charging device that can provide the first charging voltage charges the first battery pack and the second battery pack connected in series. Wherein, the first end of the third switch is connected to the first end of the seventh switch, and the second end of the third switch is connected to the output end of the first charging device; the first end of the fourth switch is connected to the first end of the second switch, and the second end of the fourth switch is connected to the output end of the first charging device; the second end of the seventh switch is connected to the first end of the first switch.

6. The circuit of claim 4, wherein, When the first battery pack and the second battery pack are connected in parallel, and the first battery pack fails, the second switch and the seventh switch are closed, and the second battery pack provides a second voltage to the electric drive device; The second end of the seventh switch is connected to the fourth interface of the double-pole double-throw switch.

7. The circuit of claim 5, wherein, When the first battery pack and the second battery pack are connected in parallel, the first switch, the second switch, the third switch, the fourth switch and the seventh switch are closed, and the second charging device that can provide the second charging voltage charges the first battery pack and the second battery pack connected in parallel. The second end of the third switch is connected to the output end of the second charging device; the second end of the fourth switch is connected to the output end of the second charging device.

8. The circuit of claim 5, wherein, The switching circuit also includes a control switch; When the first battery pack and the second battery pack are connected in series, the first switch, the second switch, the third switch, the fourth switch and the control switch are closed. The third charging voltage provided by the third charging device is reduced to the second voltage by the electric drive device and then charges the first battery pack and the second battery pack connected in parallel. The second end of the third switch is connected to the output end of the third charging device; the second end of the fourth switch is connected to the output end of the third charging device; the first end of the control switch is connected to the first or third interface of the double-pole double-throw switch, and the second end of the control switch is connected to the output end of the electric drive device.

9. The circuit of claim 8, wherein, When the first battery pack and the second battery pack are connected in series, the first switch, the second switch, and the control switch are closed, and the electric drive device heats the first battery pack and the second battery pack.

10. The circuit of claim 8 or 9, characterized in that, The electric drive device includes a first electric drive device and a second electric drive device; the control switch includes a fifth switch and a sixth switch; Wherein, the input terminal of the first electric drive device and the input terminal of the second electric drive device are both connected to the input terminal of the electric drive device; The output end of the first electric drive device is connected to the second end of the fifth switch, and the first end of the fifth switch is connected to the first or third interface of the double-pole double-throw switch. The output terminal of the second electric drive device is connected to the second terminal of the sixth switch, and the first terminal of the sixth switch is connected to the first or third interface of the double-pole double-throw switch.

11. The circuit of claim 10, wherein, Also includes: A filtering module, wherein the first ends of the fifth switch and the sixth switch are both connected to the first end of the filtering module, and the second end of the filtering module is connected to the first or third interface of the double-pole double-throw switch.

12. The circuit of any one of claims 1 to 11, wherein, Also includes: A first converter, wherein the first input terminal and the second input terminal of the first converter are respectively connected to the first terminal of the first switch and the second switch; The second converter has its first and second input terminals connected to the first switch and the second terminal of the second switch, respectively; the output terminals of both the first and second converters are connected to the input terminals of the load. Wherein, the first switch and the second switch are closed to provide load voltage to the load through at least one of the first converter and the second converter connected in parallel.

13. The circuit of any one of claims 1 to 11, wherein, Also includes: The second converter has its first input terminal and second input terminal connected to the first switch and the second terminal of the second switch, respectively. The output of the second converter is connected to the input of the load; The first and third interfaces of the double-pole double-throw switch are connected, and the first and second battery packs are connected in series. When the first switch and the second switch are off, in the non-charging and non-driving state, the second converter is used to provide load voltage to the load.

14. A vehicle battery charge-discharge control device characterized by comprising: Includes the vehicle battery charging and discharging control circuit as described in any one of claims 1 to 13.

15. The vehicle battery charge and discharge control device according to claim 14, characterized by Also includes: A controller is connected to the switching circuit and is used to control the switching circuit.

16. A vehicle characterized by comprising: include: The vehicle battery charging and discharging control device as described in claim 14 or 15; The vehicle battery charging and discharging control device supplies electrical energy to the electric drive unit, or charges the first battery pack and the second battery pack connected in parallel or in series.

17. The vehicle of claim 16, wherein, Also includes: The load obtains load voltage from the first battery pack and / or the second battery pack through a first converter and / or a second converter.

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