Multi-stage charge control

Abstract

Techniques for multi-stage charge control of a vehicle are provided. In one embodiment, the technique involves determining a charging stage capability of a charging source, upon determining that the charging stage capability includes a multi-stage charging, determining a first charging criterion, selecting a first charging circuit configuration based on the first charging criterion, and transmitting the selected first charging circuit configuration to the charging source. Wherein the first charging circuit configuration includes a first combination of battery cell groups of a rechargeable energy storage system of the vehicle, charging the rechargeable energy storage system via the first charging circuit configuration, determining a second charging criterion, selecting a second charging circuit configuration based on the second charging criterion, and transmitting the selected second charging circuit configuration to the rechargeable energy storage system. Wherein the second charging circuit configuration comprises a second combination of battery cell groups of the rechargeable energy storage system, and the rechargeable energy storage system is charged via the second charging circuit configuration.

Description

Technical Field

[0001] The present disclosure relates to vehicle charging, and more particularly, to optimizing a multi-stage direct current fast charging (DCFC) process. Background Art

[0002] Multi-stage DCFC charging refers to a charging process for an energy storage system that applies different currents to a battery system to balance fast charging objectives with battery protection issues. However, the multi-stage DCFC charging process generally does not involve control of the circuit configuration of the vehicle's energy storage system. Summary of the Invention

[0003] In one exemplary embodiment, a method for multi-stage charging control of a vehicle is provided. The method includes determining the charging stage capabilities of a power source, determining a first charging criterion when the determined charging stage capabilities include multi-stage charging, selecting a first charging circuit configuration based on the first charging criterion, the first charging circuit configuration including a first combination of battery cell groups of a rechargeable energy storage system of the vehicle, and charging the rechargeable energy storage system via the first charging circuit configuration.

[0004] In addition to one or more features described herein, the method further includes determining a second charging criterion, selecting a second charging circuit configuration based on the second charging criterion, the second charging circuit configuration including a second combination of battery cell groups of the rechargeable energy storage system, and charging the rechargeable energy storage system via the second charging circuit configuration.

[0005] In addition to one or more features described herein, the power source includes a charging station, another vehicle, a mobile power source, or a power grid.

[0006] In addition to one or more features described herein, the first charging criterion includes at least one of the following: available power of the power source, current charging capabilities of the battery cell groups, user charging duration limit, user charging cost limit, temperature of the rechargeable energy storage system, or accessory load of the vehicle.

[0007] In addition to one or more features described herein, the second charging criterion includes at least one of the following: update of the available power of the power source, update of the current charging capabilities of the battery cell groups, elapsed time associated with a user-entered charging duration, accumulated cost associated with a user-entered cost, update of the temperature of the rechargeable energy storage system, or update of the accessory load.

[0008] In addition to one or more features described herein, a selection of a second charging circuit configuration is performed upon occurrence of a transition event, the transition event including one of the following: a match between the charging capabilities of a first charging circuit configuration and a second charging circuit configuration, a match between the charging capabilities of the second charging circuit configuration and the available power limit or maximum power output limit of a charging power source, reducing an accessory load of the first charging circuit configuration to a power below a power threshold, raising the temperature of a rechargeable energy storage system or the battery cell group to a temperature above a temperature threshold, or an elapse of a specified duration.

[0009] In addition to one or more features described herein, the first charging circuit configuration represents a 400V parallel circuit configuration, and the second charging circuit configuration represents an 800V series circuit configuration.

[0010] In another exemplary embodiment, a system for multi-stage charging control for a vehicle is provided. The system includes a processor and a memory or storage device, the memory or storage device including algorithms or computer instructions that perform operations when executed by the processor. The operations include determining a charging stage capability of a charging power source, determining a first charging criterion when determining that the charging stage capability includes multi-stage charging, selecting a first charging circuit configuration based on the first charging criterion, the first charging circuit configuration including a first combination of battery cell groups of a rechargeable energy storage system of the vehicle, and charging the rechargeable energy storage system via the first charging circuit configuration.

[0011] In addition to one or more features described herein, the operations further include determining a second charging criterion, selecting a second charging circuit configuration based on the second charging criterion, the second charging circuit configuration including a second combination of battery cell groups of the rechargeable energy storage system, and charging the rechargeable energy storage system via the second charging circuit configuration.

[0012] In addition to one or more features described herein, the charging power source includes a charging station, another vehicle, a mobile power source, or a power grid.

[0013] In addition to one or more features described herein, the first charging criterion includes at least one of the following: available power of the charging power source, current charging capability of the battery cell group, user charging duration limit, user charging cost limit, temperature of the rechargeable energy storage system, or accessory load of the vehicle.

[0014] In addition to one or more features described herein, the second charging criterion includes at least one of the following: an update of the available power of the charging power source, an update of the current charging capability of the battery cell group, an elapse of time associated with a user-input charging duration, an accumulated cost associated with a user-input cost, an update of the temperature of the rechargeable energy storage system, or an update of the accessory load.

[0015] In addition to one or more features described herein, selection of a second charging circuit configuration is performed upon occurrence of a transition event, the transition event including one of the following: a match between the charging capabilities of a first charging circuit configuration and a second charging circuit configuration, a match between the charging capabilities of the second charging circuit configuration and the available power limit or maximum power output limit of a power source, reduction of an accessory load of the first charging circuit configuration to a power below a power threshold, elevation of the temperature of a rechargeable energy storage system or the battery cell group to a temperature above a temperature threshold, or elapse of a specified duration.

[0016] In addition to one or more features described herein, the first charging circuit configuration represents a 400V parallel circuit configuration and the second charging circuit configuration represents an 800V series circuit configuration.

[0017] In yet another exemplary embodiment, a computer-readable storage medium for multi-stage charging control of a vehicle is provided, the computer-readable storage medium having computer-readable program code embodied therewith. The computer-readable program code is executable by one or more computer processors to perform operations including: determining a charging stage capability of a power source, determining a first charging criterion when determining that the charging stage capability includes multi-stage charging, selecting a first charging circuit configuration based on the first charging criterion, the first charging circuit configuration including a first combination of battery cells of a rechargeable energy storage system of the vehicle, and charging the rechargeable energy storage system via the first charging circuit configuration.

[0018] In addition to one or more features described herein, the operations further include determining a second charging criterion, selecting a second charging circuit configuration based on the second charging criterion, the second charging circuit configuration including a second combination of battery cells of the rechargeable energy storage system, and charging the rechargeable energy storage system via the second charging circuit configuration.

[0019] In addition to one or more features described herein, the first charging criterion includes at least one of the following: available power of the power source, current charging capability of the battery cell group, user charging duration limit, user charging cost limit, temperature of the rechargeable energy storage system, or accessory load of the vehicle.

[0020] In addition to one or more features described herein, the second charging criterion includes at least one of the following: an update of the available power of the power source, an update of the current charging capability of the battery cell group, elapse of time associated with a user-entered charging duration, cumulative cost associated with a user-entered cost, an update of the temperature of the rechargeable energy storage system, or an update of the accessory load.

[0021] In addition to one or more features described herein, selection of a second charging circuit configuration is performed upon occurrence of a transition event, the transition event including one of the following: a match between the charging capabilities of a first charging circuit configuration and a second charging circuit configuration, a match between the charging capabilities of the second charging circuit configuration and an available power limit or a maximum power output limit of a charging source, reduction of an accessory load of the first charging circuit configuration to a power below a power threshold, elevation of the temperature of a rechargeable energy storage system or the battery cell group to above a temperature threshold, or elapse of a specified duration.

[0022] In addition to one or more features described herein, the first charging circuit configuration represents a 400V parallel circuit configuration, the second charging circuit configuration represents an 800V series circuit configuration, and the charging source includes a charging station, another vehicle, a mobile power source, or a power grid.

[0023] The above and other features and advantages of the present disclosure, as well as other features and advantages, are apparent from the following detailed description when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, advantages, and details appear only by way of example in the following detailed description, which refers to the accompanying drawings, in which:

[0025] Figure 1 A vehicle according to one embodiment is shown;

[0026] Figure 2 A computing environment according to one embodiment is shown;

[0027] Figure 3 A flowchart of a method for charging an energy storage system via a first charging circuit configuration according to one embodiment is shown; and

[0028] Figure 4 A flowchart of a method for charging an energy storage system via a second charging circuit configuration according to one embodiment is shown. DETAILED DESCRIPTION

[0029] The following description is merely exemplary in nature and is not intended to limit the present disclosure, its application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features. As used herein, the term "module" may refer to one or more algorithms, instruction sets, software applications, or other computer-readable program code that can be executed by a processor to perform the functions, operations, or processes described herein.

[0030] Embodiments of the present disclosure improve multi-stage DCFC technology by providing a charging control module that constructs or reconstructs a charging circuit configuration of a rechargeable energy storage system (RESS). In one embodiment, the charging control module connects battery cell groups of the RESS in series or in parallel to provide a first charging circuit configuration based on charging criteria. The RESS is then charged via the first charging circuit. Additionally, the charging control module may switch to a second charging circuit configuration based on updated charging criteria. The RESS may then be charged via the second charging circuit configuration.

[0031] One benefit of the disclosed embodiments is to increase the charging speed by using an appropriate charging circuit configuration to regulate the system temperature in colder climates. Additionally, embodiments of the present disclosure may use an appropriate charging circuit configuration to optimize charging according to user preferences.

[0032] Figure 1 Vehicle 100 according to one embodiment is shown. Vehicle 100 includes a body 102 that may support a charging port 104, a power system 106, a sensor system 108, a controlled plug 114, and a propulsion system 120, a controller 140, and other systems of vehicle 100 described herein.

[0033] In one embodiment, vehicle 100 is an electric vehicle (EV) or a hybrid electric vehicle (HEV). In the illustrated embodiment, vehicle 100 is an HEV that is partially powered by power system 106, which includes a plurality of interconnected battery cells. Power system 106 is a rechargeable energy storage system (RESS) that may be charged via a charging port 104 connected to a power source (e.g., the power grid, a charging station, another vehicle, a mobile power source, etc.).

[0034] Power system 106 may be electrically coupled to at least one electric motor assembly of propulsion system 120. In one embodiment, power system 106 is electrically coupled to a direct current (DC) converter unit 110 (e.g., a DC-DC converter) and an inverter unit 112 (e.g., a traction power inverter unit). Inverter unit 112 may include a plurality of inverters that convert a DC signal from power system 106 into a three-phase alternating current (AC) signal to drive the electric motors of propulsion system 120. Power system 106 may also be electrically coupled to vehicle electronic systems, such as an audio system, a display system, a navigation system, a temperature control system, etc.

[0035] The sensor system 108 includes various sensors disposed on or integrated with various components of the vehicle 100. In one embodiment, the sensor system 108 is communicatively coupled to the controller 140 to transmit measurements of the power system 106 to the controller 140. The sensor system 108 may include current sensors, voltage sensors, temperature sensors, etc.

[0036] The controlled contact 114 may be coupled to the power system 106 and the controller 140. In one embodiment, the controlled plug 114 may be connected to the plug of the battery unit of the power system 106 to form various charging circuit configurations.

[0037] The propulsion system 120 may include an internal combustion engine (ICE) system 122 and at least one electric motor assembly (e.g., a first electric motor 124 and a second electric motor 126). Each component of the propulsion system 120 may be configured to drive at least one wheel 130 of the vehicle 100 via a driveline coupled to a front half shaft or a rear half shaft, the front half shaft or the rear half shaft being coupled to a corresponding front set of wheels 130 and a rear set of wheels 130.

[0038] In one embodiment, the controller 140 is configured to control the controlled plug 114 to generate various charging circuit configurations. The controller 140 is further discussed in Figure 2 . Techniques for optimizing charging via charging circuit configurations are discussed in Figure 3 and Figure 4 .

[0039] Figure 2 A computing environment 200 is shown in accordance with one embodiment. In the illustrated embodiment, the computing environment 200 includes a controller 140, a network 230, a power source 240, and a charging circuit configuration 250.

[0040] In one embodiment, the controller 140 includes a processor 202 that obtains instructions and data from a memory 204 or a storage device 208 via a bus 222. Not all components of the controller 140 are shown. The controller 140 is generally under the control of an operating system (OS) suitable for executing or supporting the functions or processes disclosed herein. The processor 202 is a programmable logic device that performs instruction, logical, and mathematical processing, and may represent one or more CPUs. The processor may execute one or more algorithms, instruction sets, or applications in the memory 204 or the storage device 208 to perform the functions or processes described herein.

[0041] The memory 204 and the storage device 208 can represent a hard disk drive, a solid state drive, a flash memory device, an optical medium, etc. The storage device 208 can also include a structured storage device (e.g., a database). Additionally, the memory 204 and the storage device 208 can be considered to include memories physically located elsewhere. For example, the memory 204 and the storage device 208 can be physically located on another computer communicatively coupled to the controller 140 via the bus 222 or the network 230.

[0042] The controller 140 can be connected to other computers (e.g., controllers, distributed databases, servers, or network hosts), a power source 240, or a charging circuit configuration 250 via the network interface 220 and the network 230. Examples of the network 230 include a Controller Area Network (CAN), a Transmission Control Protocol (TCP) bus, a charging cable, an electrical bus, a physical transmission cable, an optical transmission fiber, a wireless transmission medium, a router, a firewall, a switch, a gateway computer, an edge server, a local area network, a wide area network, a wireless network, etc. The network interface 220 can be any type of network communication device that allows the controller 140 to communicate with other components of the computer and computing environment 200 via the network 230.

[0043] In the illustrated embodiment, the memory 204 includes a Charge Control Module (CCM) 206. In one embodiment, the CCM 206 represents one or more algorithms, instruction sets, software applications, or other computer-readable program codes that can be executed by the processor 202 to perform the functions, operations, or processes described herein.

[0044] In one embodiment, the CCM 206 determines the ability of the power source 240 to perform multi-stage charging and determines the available power of the power source 240. The CCM 206 can store data of these characteristics of the power source 240 in the storage device 208 as charging data 210. Additionally, the CCM 206 can receive user input indicating a charging duration or a charging cost limit and store the data of the user input in the storage device 208 as user input data 212.

[0045] The CCM 206 can also determine the characteristics of the RESS, such as the average temperature of the RESS or the ability to accept current. Thereafter, the CCM 206 operates the controlled plug 114 to generate a charging circuit configuration 250 that optimizes the charging of the RESS based on the above-mentioned characteristics and data.

[0046] In the illustrated embodiment, the charging circuit configuration 250 includes a controlled plug 114, a battery cell group 252 1-N and corresponding battery cell group plugs 254 1-N . The controlled plug 114 can be connected to the battery cell group plugs 2541-N The controlled contact 114 may also include a plurality of circuit elements and circuit paths that connect the battery cell groups 252 in various combinations. 1-N 1-N To generate corresponding charging circuit configurations. For example, the CCM 206 may control the controlled plug 114 to connect the first battery cell group (e.g., battery cell group 2521) and the second battery cell group (e.g., battery cell group 2522) in series or in parallel. Thus, one charging circuit configuration 250 may include a first battery cell group and a second battery cell group connected in series, and another charging circuit configuration 250 may include a first battery cell group and a second battery cell group connected in parallel.

[0047] In this way, the CCM 206 may also generate charging circuit configurations including any number of battery cell groups 252 1-N or combinations thereof. The battery cell groups 252 1-N may output a given voltage output that may be aggregated or maintained via the charging circuit configuration. Although embodiments of the present disclosure may describe combinations of a first battery cell group and a second battery cell group, any combination of N battery cell groups may be used.

[0048] Continuing with the previous example, each battery cell group may output 400V. Thus, a charging circuit configuration 250 having a first and a second battery group connected in series may output 800V, while a charging circuit configuration 250 having a first and a second battery group connected in parallel may output 400V. Additionally, the voltage output of the charging circuit configuration 250 may scale with the number of connected battery cell groups (e.g., 1200V for 3 battery cell groups connected in series, 1600V for 4 battery cell groups connected in series, etc.). The operation of the CCM 206 is further described herein Figures 3 - 4 below.

[0049] Figure 3 FIG. 300 shows a flow chart of a method 300 for charging an energy storage system via a first charging circuit configuration according to an embodiment. Method 300 begins at block 302.

[0050] At block 304, a charge control module (CCM) 206 determines the charging stage capabilities of the charge source 240. In one embodiment, the charge source 240 includes a charging station, another vehicle, a mobile power source, the power grid, etc. The CCM 206 may use a handshaking process to establish a connection with the charge source 240 and negotiate charging parameters (e.g., available power, power level capabilities, maximum power capabilities, power rate / cost, voltage transfer limits, current transfer limits, etc.).

[0051] At block 306, the CCM 206 determines whether the charging stage capability includes multi-stage charging. When it is determined that the charging stage capability does not include multi-stage charging, method 300 proceeds to block 308, where the CCM 206 charges the rechargeable energy storage system (RESS) of the vehicle 100 via a single-stage DCFC session. Then, method 300 proceeds to block 316, where method 300 ends. However, returning to block 306, when it is determined that the charging stage capability includes multi-stage charging, method 300 proceeds to block 310.

[0052] At block 310, the CCM 206 determines a first charging criterion. In one embodiment, the first charging criterion includes at least one of the following: the available power of the power source 240, the current charging capability of the battery cell group 252 1-N , the user charging duration limit, the user charging cost limit, the temperature of the RESS of the vehicle 100, or the accessory load of the vehicle 100.

[0053] At block 312, the CCM 206 selects a first charging circuit configuration based on the first charging criterion. In one embodiment, the CCM 206 limits the selection of the first charging circuit configuration to a combination of battery cell groups 252 that can be supported by the available power from the power source 240 1-N . For example, assuming the current available power of the power source (e.g., available voltage supply) is 500V, the CCM 206 can select a parallel charging circuit configuration that can accept 400V instead of a series charging circuit configuration that can accept 800V.

[0054] In one embodiment, when the user inputs a charging duration limit, the CCM 206 can select a series charging circuit configuration to quickly recharge the vehicle 100 during a specific duration. When the user inputs a charging cost limit, the CCM 206 can identify the power rate / cost of the power source 240 and select a series or parallel charging circuit configuration to maximize the amount of power supplied by the power source 240 while staying below the charging cost limit.

[0055] In one embodiment, the charging capability of the battery cell group 252 1-N is affected by the temperature of the battery cell group 252 1-N . For example, when the RESS including a single battery cell group 252 1-N is in a cold environment, the single battery cell group 252 1-N may be less able to accept power. In this case, the CCM 206 can select a parallel-connected charging circuit configuration 250 to operate at a lower voltage while generating heat to heat the battery cell group 252 1-N to the temperature of the battery cell group 252 1-NTemperatures that can accept a greater amount of electricity. For example, the use of a parallel charging circuit configuration can generate heat along the circuit path of the controlled plug 114 (which can be connected to a heat sink or a liquid cooling system), through each battery cell of the battery cell group 252 1-N or in the liquid cooling system at the charging port 104.

[0056] The CCM 206 can also consider the accessory load of the vehicle 100. In one embodiment, when the battery cell group 252 1-N has a low ability to accept electricity, the accessory load connected to the series charging circuit configuration can use the electricity provided by the power source to the series charging circuit configuration, thereby reducing the electricity available for recharging the connected battery cell group. In this case, the CCM 206 can select a parallel charging circuit configuration to prevent the power used by the accessory load (connected in parallel to the battery cell group 252 1-N ) from reducing the power available to the battery cell group 252 1-N compared to the series charging circuit configuration.

[0057] At block 314, the CCM 206 charges the energy storage system via the first charging circuit configuration. The method 300 ends at block 316.

[0058] Figure 4 FIG. shows a flowchart of a method 400 for charging an energy storage system via a second charging circuit configuration according to an embodiment. The method 400 begins at block 402.

[0059] At block 404, the CCM 206 determines a second charging criterion. In one embodiment, the second charging criterion includes at least one of the following: an update of the available power of the power source 240, an update of the current charging ability of the battery cell group 252 1-N , the passage of time associated with a user-input charging duration, the cumulative cost associated with a user-input cost, an update of the temperature of the RESS of the vehicle 100, or an update of the accessory load of the vehicle 100.

[0060] In one embodiment, the CCM 206 generates a message notifying the user of the passage of time or the cumulative cost. The CCM 206 can transmit the message to the display of the vehicle 100 or a user device connected to the vehicle 100.

[0061] At block 406, the CCM 206 selects a second charging circuit configuration based on the second charging criterion. A process similar to the process described in Figure 3 can be used to select the second charging circuit configuration.

[0062] In one embodiment, the selection of the second charging circuit configuration is made when a transition event occurs. Examples of transition events include: a match between the charging capabilities of the first and second charging circuit configurations, a match between the charging capabilities of the second charging circuit configuration and the available power limit or maximum power output limit of the power source 240 (e.g., when another vehicle disconnects or connects to the power source 240, the available power limit can increase or decrease to match the charging capabilities of the second charging circuit configuration), a reduction of the accessory load of the first charging circuit configuration to a power below a power threshold, an increase in the temperature of the RESS or battery cell group 252 1-N to a temperature above a temperature threshold, the elapse of a specified duration, etc.

[0063] At block 408, the CCM 206 charges the energy storage system via the second charging circuit. In one embodiment, the first and second charging circuit configurations include different combinations of the battery cell group 252 1-N such that the selection of the second charging circuit configuration represents a switch to a different recharge capability of the vehicle 100 during a single charging session (or during multiple subsequent charging sessions).

[0064] The power source 240 may need to start a new charging session to switch to a second charging circuit configuration different from the first charging circuit configuration. In such a case, in one embodiment, the CCM 206 generates a message instructing the user to re-initiate the session (i.e., disconnect and reconnect the charging cable from the charging port 104). The CCM 206 can transmit the message to the display of the vehicle 100 or to a user device coupled to the vehicle 100.

[0065] The CCM 206 automatically restarts the billing session. In one embodiment, the vehicle 100 can restart the session by temporarily reducing the voltage via the control pilot communication line. For example, the charging port 104 can include multiple pins for communicating with the power source 240. One of the pins can be dedicated to the control pilot signal, which can cause the power source 240 to reset the session when the voltage drops below a reset threshold.

[0066] In another embodiment, the CCM 206 can reduce the power demand from the power source 240 to 0 A to cause the power source 240 to stop the charging session. Thereafter, the CCM 206 can increase the power demand to match the requirements of the second charging circuit configuration. Method 400 ends at block 410.

[0067] The terms "a" and "an" do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced items. Unless the context clearly dictates otherwise, the term "or" means "and / or". References to "aspects" throughout the specification mean that the particular elements (e.g., features, structures, steps, or properties) described in connection with that aspect are included in at least one aspect described herein, and may or may not be present in other aspects. Additionally, it should be understood that the described elements may be combined in any suitable manner in the various aspects.

[0068] When an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, no intervening elements are present.

[0069] Unless otherwise stated herein, all test standards are the latest standards in effect as of the filing date of this application, or, if priority is claimed, the filing date of the earliest priority application in which the test standard appears.

[0070] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0071] Although the foregoing disclosure has been described with reference to exemplary embodiments, those skilled in the art will understand that various changes can be made and equivalents can be substituted for its elements without departing from its scope. Additionally, many modifications can be made to adapt a particular situation or material to the teachings of the disclosure without departing from its basic scope. Therefore, it is intended that this disclosure not be limited to the particular embodiments disclosed, but rather will include all embodiments falling within its scope.

Claims

1. A system for multi-stage charging control of a vehicle, comprising: processor; as well as a memory or storage device including an algorithm or computer instructions that, when executed by the processor, performs operations comprising: Determine the charging stage capabilities of the charging source; Upon determining that the charging stage capability includes multi-stage charging, determining a first charging criterion; selecting a first charging circuit configuration based on a first charging criterion, wherein the first charging circuit configuration includes a first combination of battery cell groups of a rechargeable energy storage system of the vehicle; and A rechargeable energy storage system is charged via a first charging circuit configuration.

2. The system of claim 1, wherein the operations further comprise: determining a second charging criterion; selecting a second charging circuit configuration based on a second charging criterion, wherein the second charging circuit configuration includes a second combination of battery cell groups of the rechargeable energy storage system; as well as The rechargeable energy storage system is charged via a second charging circuit configuration.

3. The system of claim 1, wherein the charging source comprises a charging station, another vehicle, a mobile power source, or an electrical grid.

4. The system of claim 1 , wherein the first charging criterion comprises at least one of: available power of a charging source, a current charging capability of the battery cell group, a user charging duration limit, a user charging cost limit, a temperature of the rechargeable energy storage system, or an accessory load of the vehicle.

5. The system of claim 2, wherein the second charging criterion comprises at least one of: an update of available power from a charging source, an update of a current charging capability of the battery cell group, an elapsed time associated with a user-input charging duration, an accumulated cost associated with a user-input cost, an update of a temperature of a rechargeable energy storage system, or an update of an accessory load.

6. The system of claim 2, wherein selection of the second charging circuit configuration is performed upon occurrence of a transition event, wherein the transition event comprises one of: a match between a charging capability of the first charging circuit configuration and a charging capability of the second charging circuit configuration, a match between the charging capability of the second charging circuit configuration and an available power limit or a maximum power output limit of a charging source, a decrease in an accessory load of the first charging circuit configuration to a power below a power threshold, an increase in temperature of the rechargeable energy storage system or the battery cell group to above a temperature threshold, or the passage of a specified duration.

7. The system of claim 2, wherein the first charging circuit configuration represents a 400V parallel circuit configuration, and wherein the second charging circuit configuration represents an 800V series circuit configuration.

8. A computer readable storage medium having computer readable program code embodied therewith, the computer readable program code being executable by one or more computer processors to perform operations for multi-stage charging control of a vehicle, the operations comprising: Determine the charging stage capabilities of the charging source; Upon determining that the charging stage capability includes multi-stage charging, determining a first charging criterion; selecting a first charging circuit configuration based on a first charging criterion, wherein the first charging circuit configuration includes a first combination of battery cell groups of a rechargeable energy storage system of the vehicle; as well as A rechargeable energy storage system is charged via a first charging circuit configuration.

9. The computer-readable storage medium of claim 8, the operations further comprising: determining a second charging criterion; selecting a second charging circuit configuration based on a second charging criterion, wherein the second charging circuit configuration includes a second combination of battery cell groups of the rechargeable energy storage system; as well as The rechargeable energy storage system is charged via a second charging circuit configuration.

10. The computer-readable storage medium of claim 9, wherein the second charging criterion comprises at least one of: an update of available power from a charging source, an update of a current charging capability of the battery cell group, an elapsed time associated with a user-input charging duration, an accumulated cost associated with a user-input cost, an update of a temperature of a rechargeable energy storage system, or an update of an accessory load.

Images