DESC:FIELD OF THE INVENTION
[0001] The present invention is generally related to the field of batteries, and, more particularly, to a dual battery pack architecture system and method for improving the utilization of more than one battery for automotive and stationary storage applications in order to increase the duration of power back up for the storage application, thereby easily swapping of individual batteries is made.
BACKGROUND OF THE INVENTION
[0002] Batteries are devices that are being used for storing and providing electrical energy. They are being used for ages as they are easy to carry from one place to another that too within or without the device which requires electrical energy. The batteries are installed at one place where the device is in a fixed state and it can be further replaced from time to time. Examples of easy-to-move batteries like electric vehicles, mobile devices, laptops, etc. Examples of fixed system batteries like domestic power inverters, solar panel batteries, etc.
[0003] Multiple varieties of batteries are already available in markets such as - Li-ion, Nickle-Cadmium, Alkaline and Zinc Carbon, etc. As per the advancement of technology, there are batteries available that are rechargeable by plugging them into charging and are used for multiple requirements before the battery needs to be replaced. Some batteries are non-rechargeable or single-use, once they are fully discharged they are sent for the recycling process.
[0004] An automotive or energy storage application utilized battery swapping, but for easy swap ability, batteries have to be lightweight. However, such lightweight batteries often suffer from lower power ratings which in some cases, like in Electric Vehicles (EVs), might be insufficient to power the load independently. This leads to an architecture wherein two (or more) batteries are connected in parallel to each other to comfortably supply the power required by the load. But the high inrush current generated in parallel connected batteries, which is creating a thermal runaway situation.
[0005] US20140009106A1 discloses a battery and load equalization circuit that prevents the in-rush of current when batteries and/or loads are initially connected in parallel. Various techniques are used including charging, discharging and use of DC to DC converters to equalize charges between batteries and capacitive loads.
[0006] Conventionally, there exist various systems and methods for preventing the high inrush current when batteries are parallelly connected. However, in order to achieve the objective, a dual battery pack architecture system is used for improving the power backup by connecting two batteries in parallel to a common voltage bus through a “H-bridge” configuration with a bi-directional DC-DC converter.
[0007] In order to overcome the aforementioned drawbacks, there is a need to provide a dual battery pack architecture system that is an enhancement to the conventional system. This system is capable of increasing the duration of power back up for an automotive and stationary storage application. This system is also be extended to a multi battery system where for every additional battery connected in parallel to the Voltage bus through an H-bridge, there is one new DC-DC converter added to the system along with a new arm with switches, thereby reducing the high inrush current between the adjacent batteries.

OBJECTS OF THE INVENTION
[0008] The principal object of the present invention is to overcome the disadvantage of the prior art.
[0009] Another object of the present invention is to provide a dual battery pack architecture system that helps in improving power backup in order to provide high power for heavy load applications.
[0010] Another object of the present invention is to provide a system that makes easy swapping of at least two batteries that are connected parallelly to each other.
[0011] Another object of the present invention is to provide a system that improves the utilization of more than one battery for automotive and stationary storage applications.
[0012] Another object of the present invention is to provide a system that is also be extended to a multi-battery system where for every additional battery connected in parallel to the Voltage bus through an H-bridge, there is one new DC-DC converter added to the system along with a new arm with switches.
[0013] Another object of the present invention is to provide a system that helps in avoiding high inrush current in between the parallelly connected batteries.
SUMMARY OF THE INVENTION
[0014] The present invention relates to a system and a method for a dual battery pack architecture for preventing high inrush current in between the parallelly connected at least two batteries in order to improve power backup, thereby ensuring easy swap ability of the batteries.
[0015] According to an embodiment of the present invention, a dual battery pack architecture system comprising, at least two batteries connected in parallel to a common voltage bus through an H-bridge, a DC-DC converter connected to each of the at least two batteries, a first switch connected in between a first battery from the at least two batteries and a load that is connected to the system, wherein the first switch connects the first battery directly to the load when closed, a second switch connected in between the first battery and the DC-DC converter, wherein the second switch, when in closed-state, routes the first battery through the DC-DC converter to the load, a third switch connected in between a second battery from the at least two batteries and the load that is connected to the system, wherein the third switch connects the second battery directly to the load when closed, a fourth switch connected in between the second battery and the DC-DC converter, wherein the fourth switch, when in closed-state, routes the second battery through the DC-DC converter to the load, a control unit connected with the first switch, the second switch, the third switch and the fourth switch.
[0016] According to an another embodiment of the present invention, the dual battery pack architecture system further comprising, the control unit which is configured to check voltage difference between the first battery and the second battery, maintain closed status of the first switch and third switch to connect the load directly to the load, open the third switch, when voltage of the first battery is lesser than voltage of the second battery and close the fourth switch to route the second battery to the load through the DC-DC converter, Open the first switch, when voltage of the second battery is lesser than voltage of the first battery and close the second switch to route the first battery to the load through the DC-DC converter, wherein when a power demand by the load is equal to or more than a nominal power of any of the at least two batteries, the first battery and the second battery are utilized to power the load and when a power demand by the load is lesser than a nominal power or any of the at least two batteries then a closed status of the fourth switch and the second switch is utilized to simultaneously power the load and charging the first battery and the second battery respectively, wherein when there is no power demand by the load then a closed status of the fourth switch and the second switch is utilized to charge the first battery and the second battery respectively.
[0017] According to an another embodiment of the present invention, a dual battery pack architecture method comprising, detecting a voltage of a first battery is equal to a voltage of a second battery then closes a first switch and a fourth switch and opens a second and a third switch by a control unit, wherein when a voltage of a DC-DC converter is equal to the voltage of the first battery, the method may end, wherein the first switch connected in between the first battery from at least two batteries associated with an H-bridge and a load that is connected to the system and the first switch also connects the first battery directly to the load when closed, wherein the second switch, when in closed-state, routes the first battery through the DC-DC converter to the load, detecting, by the control unit, the voltage of the first battery is greater than the voltage of the second battery, also if a power demand is equal to or greater than a nominal power of the first battery then closes the second and fourth switch and opens the first and third switch, wherein when the voltage of the DC-DC converter is equal to the voltage of the second battery, the method ends.
[0018] According to an another embodiment of the present invention, the dual battery pack architecture method further comprising,detecting the power demand is equal to or greater than the nominal power of the second battery then closes the first switch and third switch, and opens the second switch and fourth switch by the control unit, wherein when the voltage of the first battery is greater than the voltage of the DC-DC converter and the voltage of the second battery, the method ends, further detecting close status of the first switch and third switch, and opens the second switch and fourth switch , wherein when the voltage of the second battery is greater than the voltage of the DC-DC converter and the voltage of the first battery, the method ends, and detecting close status of the second switch and fourth switch, and opens the first switch and third switch , wherein when the voltage of the first battery is greater than the voltage of the DC-DC converter and the voltage of the second battery, the method ends, wherein the third switch connected in between the second battery from the at least two batteries and the load that is connected to the system and the third switch connects the second battery directly to the load when closed, wherein the fourth switch connected in between the second battery and the DC-DC converter, wherein the fourth switch, when in closed-state, routes the second battery through the DC-DC converter to the load.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The accompanying drawings illustrate various embodiments of systems, methods, and embodiments of various other aspects of the disclosure. Any person with ordinary skills in the art will appreciate that the illustrated element boundaries (e.g. boxes, groups of boxes, or other shapes) in the figures represent one example of the boundaries. It may be that in some examples one element may be designed as multiple elements or that multiple elements may be designed as one element. In some examples, an element shown as an internal component of one element may be implemented as an external component in another, and vice versa. Furthermore, elements may not be drawn to scale. Non-limiting and non-exhaustive descriptions /are described with reference to the following drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating principles.
[0020] Fig.1 is a schematic view of an embodiment of two batteries that are wired for parallel connection through multiple switches, according to an embodiment of a present invention;
[0021] Fig.2 is a schematic illustration of an embodiment of two batteries that are connected in parallel with the switches and an AFE (Analog front End) may be embedded within the control unit, according to an embodiment of a present invention;
[0022] Fig.3 is a tabulation view illustrating battery voltage conditions, switch conditions and DC-DC voltage output by utilizing a DC-DC buck converter, according to an embodiment of a present invention; and
[0023] Fig.4 depicting a block diagram 400 of a method for a dual battery pack architecture system, according to an embodiment of a present invention.
DETAILED DESCRIPTION
[0024] Embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings in which, like numerals represent like elements throughout the several figures, and in which example embodiments are shown. Embodiments of the claims may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The examples set forth herein are non-limiting examples and are merely examples among other possible examples.
[0025] Some embodiments of this invention, illustrating all its features, will now be discussed in detail. The words “comprising,” “having,” “containing,” and “including,” and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items or meant to be limited to only the listed item or items.
[0026] It must also be noted that as used herein and in the appended claims, the singular forms “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise. Although any systems and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present invention, the preferred systems and methods are now described.
[0027] The present invention relates to a system and a method for a dual battery pack architecture for improving the power backup by connecting two batteries in parallel to a common voltage bus through an “H-bridge” configuration with a bi-directional DC-DC converter in order to avoid the high internal surge currents between the batteries which occur due to low internal resistances of battery packs.
[0028] Fig.1 is a schematic view of an embodiment of two batteries that are wired for parallel connection through multiple switches, according to an embodiment of a present invention. The system includes at least two batteries (102, 104) connected in parallel to a common voltage bus through an H-bridge, a DC-DC converter 106 connected to each of the at least two batteries (102, 104), a first switch 108 connected in between a first battery 102 from the at least two batteries (102, 104) and a load 118 that is connected to the system 100. The first switch 108 connects the first battery directly to the load 118 when closed. The system 100 further includes a second switch 110 connected in between the first battery 102 and the DC-DC converter 106, wherein the second switch 110, when in closed-state, routes the first battery 102 through the DC-DC converter 106 to the load 118.
[0029] The system further includes a third switch 112 connected in between a second battery 104 from the at least two batteries (102, 104) and the load 118 that is connected to the system 100, wherein the third switch 112 connects the second battery 104 directly to the load 118 when closed. The system also includes a fourth switch 114 connected in between the second battery 104 and the DC-DC converter 106, wherein the fourth switch 114, when in closed-state, routes the second battery 104 through the DC-DC converter 106 to the load 118. In one embodiment, the system includes a control unit 116 connected with the first switch 108, the second switch 110, the third switch 112, and the fourth switch 114.
[0030] According to an another embodiment of the present invention, the dual battery pack architecture system 100 further comprising, the control unit 116 which is configured to check voltage difference between the first battery 102 and the second battery 104, maintain closed status of the first switch 108 and third switch 112 to connect the load 118 directly, and command opening and closing of the switches (108, 110, 112, 114). The control unit 116 opens the third switch 112, when voltage of the first battery 102 is lesser than voltage of the second battery 104 and close the fourth switch 114 to route the second battery 104 to the load 1118 through the DC-DC converter 106. The control unit 116 further opens the first switch 108, when voltage of the second battery 104 is lesser than voltage of the first battery 102 and close the second switch 110 to route the first battery 102 to the load 118 through the DC-DC converter 106.
[0031] In another embodiment, when a power demand by the load is equal to or more than a nominal power of any of the at least two batteries (102, 104), the first battery 102 and the second battery 104 are utilized to power the load 118 and when a power demand by the load 118 is lesser than a nominal power or any of the at least two batteries (102, 104) then a closed status of the fourth switch 114 and the second switch 110 is utilized to simultaneously power the load 118 and charging the first battery 102 and the second battery 104 respectively, wherein when there is no power demand by the load 118 then a closed status of the fourth switch 114 and the second switch 110 is utilized to charge the first battery 102 and the second battery 104 respectively.
[0032] The bidirectional DC-DC converter 106 may be of buck-boost (Step down & step-up capability) type. The two individual small batteries (102, 104) may be connected to the voltage bus through the H-Bridge and DC-DC converter setup 106. Further, the Control Unit (CU) 116 may be a microcontroller that senses the battery voltages, commands the opening and closing of the switches (108, 110, 112, 114) and the output voltage of the DC-DC converter 106.
[0033] Fig.2 is a schematic illustration of an embodiment of two batteries that are connected in parallel with the switches and an AFE (Analog front End) may be embedded within the control unit, according to an embodiment of a present invention. In one embodiment of the present invention, among the absence of direct communication channels/capability in the battery pack and DC-DC converter 106, an AFE may be embedded within the control unit 116, which then measures and communicates the voltages across the batteries (102,104) and the DC-DC converter 106 to the microcontroller 116.
[0034] In accordance with an embodiment of the present invention, at least two Lithium-ion batteries (102, 104) may be linked in parallel across a load/charger in this design (in particular, the load is a motor controller). Moreover, through a series of switches and a DC-DC buck/boost converter 106, the battery's negative terminals may be connected to a negative potential (which may or may not be the same as ground), and the positive terminals may be connected to the positive terminal of the load.
[0035] Particularly, a first switch 108 links with the first battery 102 directly to the load 118, whereas the second switch 110 sends the first Battery 102 to the load 118 via the DC-DC converter 106. Similarly, the fourth switch 114 links the second battery 104 directly to the load 118, whereas the third switch 112 routes the second battery 104 to the load 118 via the DC-DC converter 106. The first 108, second 110, third 112, and fourth switches 114 are switches that connect with a central microprocessor 116 (the Control unit). To avoid direct contact between the batteries (102, 104) and high inter-battery surge currents, second 110 and third switches 112 are never closed at the same time.
[0036] The power delivery from each of the load's two batteries (102, 104) may be controlled by switches each of the four switches (108, 110, 112, 114). The microcontroller, often known as the CU, regulates the operation of the switches (108, 110, 112, 114). The battery (102, 104) and bus voltages are also continuously measured by the CU 116. The first 108 and fourth switch 114 may be open when the voltage of both batteries (102, 104) is the same, allowing both batteries (102, 104) to be connected directly to the load 118. The CU 116 may control switching in two ways if the voltage difference between the two batteries (102, 104) exceeds a specified value.
[0037] When the voltage of first battery 102 falls below that of second battery 104, and the difference between the two batteries (102, 104) exceeds the pre-set value, fourth switch 114 opens, third switch closes 112, and second switch 110 remains open, routing the second battery 104 through the DC-DC converter 106, operating in buck mode and steps down its voltage to that of first battery 102 before feeding it to the load line 118.
[0038] Alternatively, the system may route the battery through the DC-DC converter 106 at a lower voltage (which would then operate in boost mode). Routing the higher/lower voltage battery through the DC-DC converter 106 is to get the voltages of both batteries (102, 104) to the same level in the shortest amount of time possible, avoiding the losses associated with a second voltage step-up/down. Particularly, the Parallel Pack operation is
VBattery1 < VBattery 2 and
Power demand > or = rated discharge power of 1 battery
[0039] In accordance with an embodiment of the present invention, when the voltage of second battery 104 goes below that of first battery 102 and the difference between the two exceeds a pre-set amount, fourth switch 114 remains closed, first switch 108 opens, second switch closes 110, and third switch 112 remains open, routing first battery 102 via the DC-DC buck converter 106. This assures battery (102, 104) compatibility with no redundancies for ease of use. Parallel Pack operation is:
VBattery1 > VBattery2 and
Power demand > or = rated discharge power of 1 battery
[0040] Both batteries power the load 118 in both aforementioned scenarios. However, it's possible that the load's 118 power requirement is substantially lower than the power/current discharge capabilities of a single battery. This opens the possibility of allowing the higher voltage battery to charge the lower voltage battery by sending some current into it. In this case, the CU 116 not only controls the switches (108, 110, 112, 114) to route the higher voltage battery via the DC-DC buck converter, but it also regulates the DC-DC buck converter's output voltage to be slightly greater than that of the lower voltage battery. The control unit 116 may be set up to compute the voltage drop between the output terminal of the DC-DC buck converter 106 and the lower voltage battery (based on voltage readings from the load 118 and the lower voltage battery), and then set the required voltage at the DC-DC controller's 106 output so that the output current from the higher voltage battery may be split proportionally between the load and the lower voltage battery. The Parallel Pack operation with Power demand < rated discharge power of first battery 102:
VBattery2 > VBattery1 ; or
VBattery1 > VBattery2
[0041] The charging of lower voltage battery under no load conditions may also be part of the mode of operation, in which case the entire discharge power from the high voltage battery is used to charge lower voltage battery alone. The CU 116 guarantees that the DC-DC converter's 106 output voltage is set so that current flow into the lower voltage battery is within the battery's safe limits. When the voltage differential between the two batteries (102, 104) reaches a predefined threshold, the charging activity will come to an end (which can also be zero). Parallel Pack operation under no load and unequal battery voltages:
VBattery2 > VBattery1 ; or
VBattery1 > VBattery2
[0042] The bidirectional DC-DC converter 106 may be chosen to provide regenerative braking in this architecture 100. Even when in regen braking, the CU 116 monitors the battery (102, 104) voltages and controls the DC converter's 106 output voltage so that the regenerative current is split proportionally between the at least two batteries (102, 104). This ensures that the lower-voltage battery receives more current, allowing it to charge faster and match its voltage/state of charge with the higher-voltage battery. As a result, the CU's 116 primary goal will always be to match the voltages of the two batteries (102, 104) in order to avoid voltage steps up and down.
[0043] Furthermore, by simply attaching an external battery in lieu of the Load 118, it is possible to charge external batteries in other electric vehicles or use a fully charged battery from another EV to charge one of these batteries in this architecture 100. This way, if the external EV's battery has a lower voltage than any of the two batteries (102, 104) in this architecture 100, it may be charged, and if the external EV's battery has a higher voltage than these batteries (102, 104), it may also charge any or both of the batteries (102, 104) connected in parallel. To enable such a feature, however, the system must include more complex safety features that ensure the standalone battery (102, 104) communicates its maximum permissible full charge voltage and maximum permissible charging current to the microcontroller 116, which may then calculate the ideal DC-DC Buck converter 106 output voltage value. The buck converter 106 may be changed with a buck-boost converter to ensure that batteries (102, 104) with voltages higher than the battery pair (102, 104) may also be charged, giving the system 100 more flexibility.
[0044] The Voltage Bus may have a maximum voltage of 58V. The Voltage Bus must have a minimum voltage of 40V. The temperature ranges from 0 to 60 degrees Celsius. Discharge. The Voltage Bus current limit might be 52x2 = 104 A. Benchmarking data may be used to determine the state of power of batteries (102, 104) at various SoCs.
[0045] Fig.3 is a tabulation view illustrating battery voltage conditions, switch conditions and DC-DC voltage output by utilizing a DC-DC buck converter 106, according to an embodiment of a present invention. In particular, the battery with higher voltage is routed through the DC-DC buck converter 106. Alternatively, the present invention may employ a DC-DC boost converter 106 for operations.
[0046] Fig.4 depicting a block diagram 400 of a method for a dual battery pack architecture system 100, according to an embodiment of a present invention. The operation of a system utilizing a DC-DC buck converter 106, where the battery (102,104) with greater voltage is routed through the DC-DC buck converter 106 in one embodiment of the present invention.
[0047] At step 1 of the operation, when voltage of a first battery 102 is equal to the voltage of the second battery 104, then the first switch 108 and the fourth switch 114 closes. Particularly, the second 110 and third switch 112 opens, as shown in block 402.
[0048] In an embodiment of the present invention, when the voltage of the DC-DC converter 106 is equal to the voltage of the first battery 102, the method may end.
[0049] At step 2, when voltage of the first battery 102 is greater than the voltage of the second battery 104, also if the power demand is equal to or greater than the nominal power of the first battery 102, then the second 110 and fourth 114 switch closes. And, first 108 and third switch 112 opens, as shown in block 404.
[0050] In an embodiment of the present invention, when the voltage of the DC-DC converter 106 is equal to the voltage of the second battery 104, the method ends.
[0051] Additionally, when voltage of the first battery 102 is lesser than the voltage of the second battery 104, then the method 400 moves to step 3. Furthermore, if the power demand is not equal to or lesser than the nominal power of the first battery 102 the method moves to step 4.
[0052] At step 3, when the power demand is equal to or greater than the nominal power of the second battery 104, then the first switch 108 and third switch 112 closes. And, second switch 110 and fourth switch 114 opens, as shown in block 406.
[0053] In an embodiment of the present invention, when the voltage of the DC-DC converter 106 is equal to the voltage of the first battery 102, the method 100 ends. Additionally, when the power demand is not equal to or lesser than the nominal power of the second battery 104, the method moves to step 5.
[0054] At step 4, the first switch 108 and third switch 112 closes and the second switch 110 and fourth switch 114 opens. Further, when the voltage of the second battery 104 is greater than the voltage of the DC-DC converter 106 and the voltage of the first battery 102, the method 100 ends
[0055] At step 5, the second switch 110 and fourth switch 114 is to be closed while the first switch 108 and third switch 110 opens, as shown in block 408. Further, when the voltage of the first battery 102 is greater than the voltage of the DC-DC converter 106 and the voltage of the second battery 104, the method ends.
[0056] This technique may be used in any system that requires multiple electric energy sources or that wants to split a large electrical energy source into two smaller ones. As long as homogeneity is maintained between the different units, this system may use any combination of electric energy storage technologies, such as ultracapacitors, lead acid batteries, and lithium-ion batteries.
[0057] To ensure that the system is extremely reliable when it is implemented, extensive testing may be required. Furthermore, operational concerns arising from the shifting of batteries with vastly different voltages may be thoroughly handled. Alternatively, the power losses caused by a DC-DC converter 106 that result in heat production may be recovered by a fan/cooling member, which may require some power.
[0058] Advantageously, the present invention intents to expand the utility of several batteries in vehicle and stationary storage applications, ensures that there is always more power available on demand for heavy load applications. Moreover, provide individual battery switching extremely simple. Further, ensures that the range of an EV and duration of power back up for a stationary storage application is also kept high.
[0059] Moreover, although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the invention as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one will readily appreciate from the disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
,CLAIMS:We Claim,
1. A dual battery pack architecture system comprising:
at least two batteries (102,104) connected in parallel to a common voltage bus associated with an H-bridge;
a DC-DC converter 106 connected to each of the at least two batteries (102,104);
a first switch 108 connected in between a first battery102 from the at least two batteries (102,104) and a load 118 that is connected to the system100, wherein the first switch 108 connects the first battery 102 directly to the load 118 when closed;
a second switch110 connected in between the first battery 102 and the DC-DC converter 106, wherein the second switch 110, when in closed-state, routes the first battery 102 through the DC-DC converter 106 to the load 118;
a third switch 112 connected in between a second battery 104 from the at least two batteries (102,104) and the load 118 that is connected to the system 100, wherein the third switch112 connects the second battery 104 directly to the load 118 when closed;
a fourth switch 114 connected in between the second battery 104 and the DC-DC converter 106, wherein the fourth switch 114, when in closed-state, routes the second battery 104 through the DC-DC converter 106 to the load 118;
a control unit 116, connected the first switch 108, the second switch 110, the third switch 112, and the fourth switch 114 , wherein the control unit 116 is configured to:
check voltage difference between the first battery 102 and the second battery 104;
maintain closed status of the first switch 108 and third switch 112 to connect the load 118 directly;
open the third switch 112 , when voltage of the first battery 102 is lesser than voltage of the second battery 104 and close the fourth switch 114 to route the second battery 104 to the load 118 through the DC-DC converter 106;
open the first switch 108, when voltage of the second battery 104 is lesser than voltage of the first battery 102 and close the second switch 110 to route the first battery 102 to the load through the DC-DC converter 106.
2. The dual battery pack architecture system 100 as claimed in claim 1, wherein when a power demand by the load 118 is equal to or more than a nominal power of any of the at least two batteries (102,104), the first battery 102 and the second battery 104 are utilized to power the load 118.
3. The dual battery pack architecture system 100 as claimed in claim 1, wherein when a power demand by the load 118 is lesser than a nominal power or any of the at least two batteries (102,104), then a closed status of the fourth switch 114 is utilized to simultaneously power the load 118 and charging the first battery 102.
4. The dual battery pack architecture system 100 as claimed in claim 1, wherein when a power demand by the load 118 is lesser than a nominal power or any of the at least two batteries (102,104) then a closed status of the second switch 110 is utilized to simultaneously power the load 118 charging the second battery 104.
5. The dual battery pack architecture system 100 as claimed in claim 1, wherein when there is no power demand by the load 118 then a closed status of the fourth switch 114 is utilized to charge the first battery 102.
6. The dual battery pack architecture system 100 as claimed in claim 1, wherein when there is no power demand by the load 118 then a closed status of the second switch 110 is utilized to charge the second battery 104.
7. A method 400 for dual battery pack architecture comprising:
detecting, by a control unit 116, a voltage of a first battery 102 is equal to a voltage of a second battery 104, then closes a first switch 108 and a fourth switch 114 and opens a second 110 and a third 112 switch, wherein when a voltage of a DC-DC converter 106 is equal to the voltage of the first battery 102, the method may end;
detecting, by the control unit 116, the voltage of the first battery 102 is greater than the voltage of the second battery 104, also if a power demand is equal to or greater than a nominal power of the first battery 102 then closes the second 110 and fourth switch 114 and opens the first 108 and third switch 112, wherein when the voltage of the DC-DC converter 106 is equal to the voltage of the second battery 104, the method ends;
detecting, by the control unit 116, the power demand is equal to or greater than the nominal power of the second battery 104, then closes the first switch 108 and third switch 112, and opens the second 110 switch and fourth switch 114, wherein when the voltage of the first battery 102 is greater than the voltage of the DC-DC converter 106 and the voltage of the second battery 104, the method ends;
detecting, by the control unit 116, close status of the first switch and third switch, and opens the second switch and fourth switch , wherein when the voltage of the second battery 104 is greater than the voltage of the DC-DC converter 106 and the voltage of the first battery 102, the method 100 ends; and
detecting, by the control unit 116, close status of the second switch 110 and fourth switch 114,and opens the first switch 108 and third switch 110, wherein when the voltage of the first battery 102 is greater than the voltage of the DC-DC converter 106 and the voltage of the second battery 104, the method ends.
8. The method 400 as claimed in claim 7, wherein the first switch 108 connected in between the first battery 102 from at least two batteries (102,104) and a load 118 that is connected to the system 100, wherein the first switch 108 connects the first battery 102 directly to the load 118 when closed.
9. The method 400 as claimed in claim 7, wherein the second switch 110 connected in between the first battery 102 and the DC-DC converter 106, wherein the second switch 110, when in closed-state, routes the first battery102 through the DC-DC converter 106 to the load 118.
10. The method 400 as claimed in claim 7, wherein the third switch 112 connected in between the second battery 104 from the at least two batteries (102,104) and the load 118 that is connected to the system 100, wherein the third switch 112 connects the second battery 104 directly to the load 118 when closed.
11. The method 400 as claimed in claim 7, wherein the fourth switch 114 connected in between the second battery 104 and the DC-DC converter 106, wherein the fourth switch 114, when in closed-state, routes the second battery 104 through the DC-DC converter 106 to the load 118.
12. The method 400 as claimed in claim 7, wherein the at least two batteries (102,104) are connected in parallel to a common voltage bus associated with an H-bridge and the DC-DC converter 106.