Description:FIELD OF THE INVENTION
[001] Present invention generally relates to an energy storage unit, more particularly relates to a system and a method for controlling charging operation of the energy storage unit.

BACKGROUND OF THE INVENTION
[002] In conventional vehicle layouts, there is a single battery pack for traction purposes of the vehicle. During charging, a charging port of the charging station is connected to an inlet port of the battery pack while it resumes charging. However, in instances where multiple battery packs / traction battery / primary battery packs are present, there is a situation where one battery pack is charged first and then charging of the next battery pack resumes. This leads to a higher charging time and creates a higher charging current in the first battery pack being charged leading to an error state.
[003] Further, in the vehicles employing multiple primary / traction battery packs for propulsion purposes, during discharging of the traction batteries they do not discharge at the same rate. The reason for unequal discharge rates may be, but not limited to, a wire length, temperature, and internal resistance. Furthermore, an imbalance in charge is created between the multiple primary batteries which is undesired.
[004] In the event of charging, when the charging port is connected to the primary battery because of varying State of Charge (SOC), the battery pack with higher SOC may try to charge earlier, which would lead to higher charging current, and it is not safe. Also, there is an uneven charging of the battery packs owing to the same.
[005] The existing battery charging systems fails to adequately address the problems such as, but not limited to, higher charging current in one battery pack leading to error state, longer charging duration, higher deterioration rate of one of the battery packs.
[006] Thus, there is a need in the art for providing a system and a method for controlling charging operation of a plurality of energy storage units which addresses the aforementioned problems and limitations.

SUMMARY OF THE INVENTION
[007] In one aspect, the present invention is directed to a system for controlling charging operation of a plurality of energy storage units. The system comprises a charger unit. The charger unit being electrically coupled to the plurality of energy storage units and configured to charge the plurality of energy storage units. The system further comprises a control unit. The control unit being in communication with the charger unit and the plurality of energy storage units. The control unit being configured to receive an input from the charger unit. The input being indicative of establishment of communication of the charger unit with the plurality of energy storage units. The control unit being configured to receive a data indicative of one or more state parameters from the plurality of energy storage units. The one or more state parameters being obtained from each of the energy storage unit of the plurality of energy storage units. The control unit being configured to generate a signal indicative of charging the plurality of energy storage units based on the data received from the plurality of energy storage units. The control unit being configured to communicate the signal to the charger unit for controlling the charging operation of the plurality of energy storage units.
[008] In an embodiment, the system comprises one or more Battery Management System (BMS). The one or more BMS being in communication with each of the plurality of energy storage units and configured to continuously monitor the one or more state parameters of the plurality of energy storage units.
[009] In an embodiment, the one or more BMS of each of the plurality of energy storage units being configured to send the data to the control unit.
[010] In a further embodiment, the charger unit comprises an output terminal being connected to an input terminal of the plurality of energy storage units.
[011] In a further embodiment, the control unit being configured to control charging of the plurality of energy storage units. The charging operation being one of a series charging and a parallel charging, and wherein the charging operation being parallel charging when the one or more state parameters of each of the plurality of energy storage units being within a pre-set range.
[012] In a further embodiment, the one or more of state parameters of the plurality of energy storage units comprises at least one of a State of Charge (SOC), a State of Health (SOH), temperature, operating current, operating voltage, operating power and a rate of discharge.
[013] In a further embodiment, the plurality of energy storage units being charged during the series charging in a sequential manner, wherein the sequential manner being based on the one or more state parameters of the plurality of energy storage units.
[014] In a further embodiment, the control unit being configured to receive the one or more state parameters of the plurality of energy storage units and determine an imbalance in the plurality of energy storage units. The control unit being configured to communicate the charging operation being one of series charging and parallel charging based on the determined imbalance in the plurality of energy storage units.
[015] In a further embodiment, the control unit being configured to categorize the BMS of one or more BMS of an energy storage unit having at least one of a higher deterioration of charge or a lower SOC as a master BMS, and further categorize the BMS’s of the remaining energy storage units as slave BMS’s, and wherein the control unit being configured to communicably connect with the master BMS and initiate charging operation of the energy storage unit coupled with the master BMS.
[016] In a further embodiment, the control unit being configured to turn ON charging operation of the energy storage unit of the plurality of energy storage units associated with master BMS and keep hold the charging of the plurality of energy storage units associated with slave BMS’s until the pre-set range of SOC of each of the plurality of energy storage units being reached.
[017] In a further embodiment, the SOC of the plurality of energy storage units having reached the pre-set range, the control unit being configured to remove categorization of the BMS as the master and the slave; communicatively connect with each of the one or more BMS; and initiate charging of the plurality of energy storage units in the parallel charging.
[018] In another aspect, the present invention is directed to a method for controlling charging operation of a plurality of energy storage units. The method comprises receiving, by a control unit, an input from a charger unit, the input being indicative of the establishment of a communication of the charger unit with the plurality of energy storage units. The method further comprises receiving, by the control unit, a data indicative of one or more state parameters from each of the plurality of energy storage units. The method further comprises generating, by the control unit, a signal indicative of charging the plurality of energy storage units based on the data received from the plurality of energy storage units. The method further comprises communicating, by the control unit, the signal to the charger unit for controlling the charging operation of the plurality of energy storage units.
[019] In an embodiment, the method comprises monitoring continuously the one or more state parameters of each of the plurality of energy storage units by one or more Battery Management System (BMS) and sending data to the control unit by the BMS of each of the plurality of energy storage units.
[020] In a further embodiment, the method comprises the charging operation being one of a series charging and a parallel charging, and wherein the charging operation being parallel charging when the one or more state parameters of each of the plurality of energy storage units being within a pre-set range.
[021] In a further embodiment, the method comprises series charging in a sequential manner, wherein the sequential manner being based on the one or more state parameters of the plurality of energy storage units.
[022] In a further embodiment, the method comprises receiving by the control unit the one or more state parameters of the plurality of energy storage units, and determining, by the control unit an imbalance in the plurality of energy storage units, wherein the control unit being configured to communicate the charging operation being one of series charging and parallel charging based on the determined imbalance in the plurality of energy storage units.
[023] In a further embodiment, the method comprises categorizing, by the control unit, the BMS of the one or more BMS of an energy storage unit having at least one of a higher deterioration of charge or a lower SOC as a master BMS, and further categorize the BMS’s of the remaining energy storage units as slave BMS’s, and wherein the control unit being configured to communicably connect with the master BMS and initiate charging operation of the energy storage unit coupled with the master BMS.
[024] In a further embodiment, the method comprises turning ON, by the control unit, charging operation of the energy storage unit of the plurality of energy storage units associated with master BMS, and keep hold the charging of the plurality of energy storage units associated with slave BMS’s until the pre-set range of SOC of each of the plurality of energy storage units being reached.
[025] In a further embodiment, the method comprises when the SOC of the one or more energy storage units having reached the pre-set range, the control unit being configured to remove categorization of the BMS as the master and the slave, communicatively connect with each of the one or more BMS; and initiate charging of the plurality of energy storage units in parallel charging.

BRIEF DESCRIPTION OF THE DRAWINGS
[026] Reference will be made to embodiments of the invention, examples of which may be illustrated in accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
Figure 1 illustrates a schematic block diagram of a system for controlling charging operation of an energy storage unit, in accordance with an embodiment of the present invention.
Figure 2 illustrates a method flowchart for controlling charging operation of energy storage unit, in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION
[027] Various features and embodiments of the present invention here will be discernible from the following further description thereof, set out hereunder.
[028] Present invention generally relates to an energy storage unit, more particularly relates to a system and a method for controlling charging operation of the energy storage unit.
[029] Figures 1 illustrates a schematic block diagram of a system 100 for controlling charging operation of a plurality of energy storage units 102, in accordance with an embodiment of the present invention. The system 100 comprises a charger unit 104. In an embodiment, the charger unit 104 is communicatively coupled to the plurality of energy storage units 102 and configured to charge the plurality of energy storage units 102. In the illustrated embodiment, the charger unit 104 is coupled to the energy storage unit “1”, the energy storage unit “2” and the energy storage unit “n”, where the character “n” defined a number of energy storage unit that may be present in the system 100 or in the vehicle (not shown). The term “energy storage unit” as used herein is a battery pack having a plurality of cells (not shown) such that the battery pack can be charged through an electric energy and the stored energy can be utilized for one or more purposes like power supply to electrical and/or electronic components including, but not limited to, lighting units, horns, control units of a vehicle (not shown) and/or to drive/propel the vehicle through an electric motor (not shown).
[030] In an embodiment, the charger unit 104 comprises an output terminal (not shown) which is connected to an input terminal (not shown) of the plurality of energy storage unit 102. In some embodiments, the charger unit 104 can be, but not limited to, an off-board charger unit having a communication port capable of exchanging Controller Area Network (CAN) messages with a control unit 106 for initiating charging of the one or more energy storage units 102. In other words, a communication with the charger unit 104 is made through the CAN messages through which an electrical connection between the charger unit 104 and the one or more energy storage units 102 is detected. In some embodiments, if the CAN message is not received by the control unit 106, an alert may be provided by the control unit 106 to a user through a Human Machine Interface (HMI) (not shown).
[031] In some alternate embodiments, the control unit 106 may include a detection pin (not shown) and the charger unit 104 may include a detection pin (not shown). When the detection pins are connected, the charger unit 104 is configured to transmit a message to the control unit 106.
[032] Referring again to Figure 1, the system 100 further comprises the control unit 106. The control unit 106 is in communication with the charger unit 104 and the plurality of energy storage units 102.
[033] In some embodiments, the control unit 106 may include one or more additional components such as, but not limited to, a memory unit (not shown), an input/output module (not shown), a pre-processing module (not shown) etc. In yet another embodiment, the system 100 may include more than one of same or similar control unit(s). In another embodiment, the control unit 106 may include only a processor which may be required to process the received instructions / signals from one or more inputs device like charger unit 104 and process the same. In yet another embodiment, the control unit 106 may be in communication with an analytic module (not shown) which is configured to perform additional analysis of the communication information received from the charger unit 104.
[034] In some embodiments, the memory unit in communication with the control unit 106 is capable of storing machine executable instructions. Further, the control unit 106 is capable of executing the machine executable instructions to perform the functions described herein. The control unit 106 is in communication with components such as the pre-processing module and the analytic module. In another embodiment, the control unit 106 is embodied as a multi-core processor, a single core processor, or a combination of one or more multi-core processors and one or more single core processors. For example, the control unit 106 is embodied as one or more of various processing devices, such as a coprocessor, a microprocessor, a controller, a digital signal processor (DSP), a processing circuitry with or without an accompanying DSP, or various other processing devices including integrated circuits such as, for example, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a microcontroller unit (MCU), a hardware accelerator, a special-purpose computer chip, or the like. In yet another embodiment, the control unit 106 is configured to execute hard-coded functionality. In still another embodiment, the control unit 106 is embodied as an executor of instructions, where the instructions are specifically configured to the control unit 106 to perform the steps or operations described herein for controlling charging operation of the plurality of energy storage units 102.
[035] In some other embodiments, the control unit 106 may further be configured to communicate a signal to an ECU (EMS ECU) or a Vehicle Control Unit (VCU) of the vehicle for controlling charging operation of the plurality of storage units 102. The embodiment of the ECU or the VCU can be configured for controlling the operation of charging of the plurality of energy storage units 102 should not be meant to be limiting the scope of the present invention.
[036] As illustrated in Figure 1, the control unit 106 is in communication with the charger unit 104 and is configured to receive an input from the charger unit 104. The charger unit 104 is in communication with the plurality of energy storage units 102 through the CAN 110 and communicates to the control unit 106 through a message. In an embodiment, the input from the charger unit 104 is indicative of establishment of communication of the charger unit 104 with the plurality of energy storage units 102.
[037] The system 100 further comprises one or more Battery Management System (BMS) 108. In the illustrated embodiment of Figure 1, the BMS – 1 is associated with the energy storage unit “1”, the BMS – 2 is associated with the energy storage unit “2”, the BMS – n is associated with the energy storage unit “n”. That is to say, the BMS-1, BMS-2...., BMS-n 108 are in communication with each of the plurality of energy storage units 102 (energy storage unit “1”, energy storage unit “2”, energy storage unit “n”, respectively. The BMS 108 is configured to continuously monitor the one or more state parameters of the plurality of energy storage units 102.
[038] In an embodiment, the BMS 108 of each of the plurality of energy storage units 102 being configured to send a data to the control unit 106. The data is indicative of the one or more state parameters of each of the energy storage unit 102. Thus, the control unit 106 is configured to receive the data indicative of one or more state parameters from the plurality of energy storage units 102. The one or more state parameters is obtained from each of the energy storage unit of the plurality of energy storage units 102. In an exemplary embodiment, the one or more of state parameters of the plurality of energy storage units 102 comprises, but not limited to, at least one of a State of Charge (SOC), a State of Health (SOH), temperature, operating current, operating voltage, charging voltage, operating power, current consumed, a rate of discharge, and charging current requirements.
[039] The control unit 106 is configured to generate a signal indicative of charging the plurality of energy storage units 102 based on the data received from the plurality of energy storage units 102.
[040] The control unit 106 is further configured to communicate the signal to the charger unit 104 for controlling the charging operation of the plurality of energy storage units 102. In an embodiment, the control unit 106 is configured to control charging of the plurality of energy storage units 102. The charging operation is one of a series charging and a parallel charging. In an embodiment, the charging operation is parallel charging when the one or more state parameters of each of the plurality of energy storage units 102 being within a pre-set range. In some embodiments, the pre-set range may vary based on peak and operating facets of the plurality of energy storage units 102. In an exemplary embodiment, the plurality of energy storage units 102 can be charged during parallel charging through a junction box 112. In some embodiments, the junction box 112 is employed which essentially splits voltage / charging current provided by the charger unit 104 between the plurality of energy storage units 102 during parallel charging of the plurality of energy storage units 102.
[041] In an embodiment, the plurality of energy storage units 102 is charged during the series charging in a sequential manner. The sequential manner is based on the one or more state parameters of the plurality of energy storage units 102.
[042] In an embodiment, the control unit 106 is configured to receive the one or more state parameters of the plurality of energy storage units 102 and determine an imbalance in the plurality of energy storage units 102. Further, the control unit 106 is configured to communicate the charging operation being one of series charging and parallel charging based on the determined imbalance in the plurality of energy storage units. The term ‘imbalance’ in the plurality of energy storage units 102 is relating to varying State of Charges (SOCs). In an event of charge imbalances between the plurality of energy storage units 102, during discharging cycle there may be a situation where the energy storage unit 102 having a higher SOC only discharges instead of distribution amongst the other energy storage units 102, leading to faster degradation or quality deterioration of the energy storage unit 102 having the higher SOC.
[043] In an embodiment, the control unit 106 is configured to categorize the BMS 108 of the one or more BMS 108 of an energy storage unit 102 having at least one of a higher deterioration of charge or a lower SOC as a master BMS. Further, the control unit 106 is configured to categorize the BMS’s 108 of the remaining energy storage units 102 as slave BMS’s. The control unit 106 is configured to communicably connect with the master BMS and initiate charging operation of the energy storage unit 102 coupled with the master BMS. However, the configuration of assigning master and slave in one or more BMSs 108 are not limited to the SOC and rate of deterioration of charge. In an aspect, the operating temperature of the plurality of energy storage units 102 is parameters wherein, in conjunction with varying SOC, the energy storage unit 102 having the highest temperature is subscribed to be the last one to charge.
[044] In an embodiment, the control unit 106 is configured to turn ON charging operation of the energy storage unit 102 of the plurality of energy storage units 102 associated with master BMS 108 and keep hold the charging of the plurality of energy storage units 102 associated with slave BMS’s 108 until the pre-set range of SOC of each of the plurality of energy storage units 102 being reached.
[045] In an embodiment, when the SOC of the one or more energy storage units 102 have reached the pre-set range, the control unit 106 is configured to remove categorization of the BMS as the master and the slave, communicatively connect with each of the one or more BMS, and initiate charging of the plurality of energy storage units in the parallel charging.
[046] Figure 2 illustrates a method flowchart for controlling charging operation of the energy storage unit, in accordance with an embodiment of the present invention. The method 200 starts at a step 202. At a step 204, the method 200 comprises receiving, by the control unit 106, an input from the charger unit 104. The input is indicative of the establishment of a communication of the charger unit 104 with the plurality of energy storage units 102.
[047] At a step 206, the method 200 comprises receiving, by the control unit 106, a data indicative of the one or more state parameters from each of the plurality of energy storage units 102.
[048] At a step 208, the method 200 comprises generating, by the control unit 106, a signal indicative of charging the plurality of energy storage units 102 based on the data received from the plurality of energy storage units 102.
[049] At a step 210, the method 200 comprises communicating, by the control unit 106, the signal to the charger unit 104 for controlling the charging operation of the plurality of energy storage units 102.
[050] The method 200 further comprises monitoring continuously one or more state parameters of each of the plurality of energy storage units 102 by one or more BMS 108 and sending data to the control unit 106 by the BMS 108 of each of the plurality of energy storage units 102. The data is indicative of the one or more state parameters of each of the energy storage unit. In an embodiment, the method 200 comprises deciding by the control unit whether a series charging should be done or parallel charging should be done. The term ‘series charging’ is defined as a charging method where one energy storage unit is charged first and then the following energy storage unit is charged. The term ‘parallel charging’ is defined as a charging method where multiple energy storage units are charged in parallel using the junction box 112.
[051] The method 200 comprises the charging operation being one of a series charging and a parallel charging, and wherein the charging operation being parallel charging when the one or more state parameters of each of the plurality of energy storage units 102 is within a pre-set range.
[052] The method 200 comprises receiving by the control unit 106 the one or more state parameters of the plurality of energy storage units 102, and determining, by the control unit 106 an imbalance in the plurality of energy storage units 102. The control unit 106 is configured to communicate the charging operation being one of series charging and parallel charging based on the determined imbalance in the plurality of energy storage units 102.
[053] The method 200 comprises categorizing, by the control unit 106 the BMS 108 of one or more BMS 108 of an energy storage unit having a higher deterioration of charge or a lower SOC as a master BMS, and further categorize the BMS’s 108 of the remaining energy storage units as slave BMS’s, and wherein the control unit 106 being configured to communicably connect with the master BMS and initiate charging operation of the energy storage unit coupled with the master BMS. In an embodiment, the method 200 comprises turning ON, by the control unit 106, an energy storage unit having a lower SOC for charging and to keeping hold the charging of an energy storage unit having a higher SOC.
[054] In an embodiment, the method 200 comprises when the SOC of the one or more energy storage units 102 have reached the pre-set range, the control unit 102 is configured to remove categorization of the BMS as the master and the slave, communicatively connect with each of the one or more BMS, and initiate charging of the plurality of energy storage units in parallel charging.
[055] In an embodiment, for charge balancing, if the energy storage units 102 have imbalance, the control unit 106 will detect the energy storage unit 102 with a lower SOC to turn ON and start charging while the energy storage unit 102 with higher SOC will wait. When both the energy storage units 102 are within a, for instance, 5% band of SOC, the control unit 106 send a signal to the charger unit 104 to enter a parallel charging.
[056] In case of master - slave architecture, the BMS 108 of the energy storage unit 102 having a higher deterioration of charge or a lower SOC presumes the role of master (dynamically) where it communicates via the CAN with the charger unit about its current and charge requirements. The control unit 106 monitors the charging of the energy storage unit associated with master BMS. Once the SOC of the storage unit associated with master BMS is consistent (5% tolerance) with the slave BMS, the control unit 106 initiates parallel charging so that all the energy storage units are charged at the same rate.
[057] In some embodiment, if an energy storage unit-1 requires 5 Ampere and the energy storage unit-2 requires 10 Ampere and SOC of both energy storage units-1 and 2 are same, then the control unit 106 demands 10 ampere current in parallel charging where each of the energy storage unit gets 5 Ampere. However, in conventional methods, the control unit 106 would have demanded 15 Ampere, where the junction box would split it in 7.5 Ampere and 7.5 Ampere and the energy storage unit – 1 would be over charged. Therefore, the functionality of the control unit 106 in controlling the charging isn’t merely limited to aspects of SOC, but also monitoring and consequent controlling with reference to operating current and operating voltage of the plurality of energy storage units 102 is ensured.
[058] Advantageously, the system disclosed in the present disclosure control the charging aspect in the plurality of energy storage units (battery packs), to accordingly optimise the discharging rate of the battery pack to evade any charge imbalance between the battery packs. That is to say, in the present invention the charging state itself balances the charge imbalances between the multiple energy storage units (battery packs), the issue of charge imbalances does not percolate in the future discharging cycles. Further, since parallel charging is achieved, the charging efficiency is improved.
[059] The present invention provides the technical advantage of improved vehicle performance as the charge imbalances between the energy storage units (battery packs) are reduced. The traction function would thereby be more effective.
[060] The system and method disclosed in the present disclosure provides an improved performance of the vehicle, improved durability or cycle life of the battery packs, improved ergonomics, better handling of the vehicle and traction characteristics of the vehicle, market attractiveness, and improved safety. Further, a warning/ alert for user is provided when the plug/pin connection is made with no current supply. That is to say, the user is alerted in case charger is plugged-in but no charge flows.
[061] The present invention improves and optimises battery life and charging, cell imbalances are reduced, control over current coming into each energy storage unit is better.
[062] The disclosed system and method may find its application in two-wheeler vehicles, three-wheeler vehicles, and any electrical equipment with rechargeable energy storage units. Further, the system and method may also be applicable onto a charging station where the charging station would determine which energy storage unit should be charged first.
[063] Present invention optimises charging time in parallel connection through the control unit which communicates with the charger unit and flexibility of usage with swappable batteries is achieved.
[064] While the present invention has been described with respect to certain embodiments, it will be apparent to those skilled in the art that various changes and modification may be made without departing from the scope of the invention as defined in the following claims.

List of Reference Numerals and Characters:
100: System
102: Plurality of energy storage units
104: Charger unit
106: Control unit
108: Battery Management System (BMS)
110: CAN
112: Junction box
200: Method
202: Start
204: Step
206: Step
208: Step
210: Step
212: Stop
, Claims:1. A system (100) for controlling charging operation of a plurality of energy storage units (102), the system (100) comprising:
a charger unit (104), the charger unit (104) being electrically coupled to the plurality of energy storage units (102) and configured to charge the plurality of energy storage units (102); and
a control unit (106), the control unit (106) being in communication with the charger unit (104) and the plurality of energy storage units (102), the control unit (106) being configured to:
receive an input from the charger unit (104), the input being indicative of establishment of communication of the charger unit (104) with the plurality of energy storage units (102),
receive a data indicative of one or more state parameters from the plurality of energy storage units (102), the one or more state parameters being obtained from each of the energy storage unit of the plurality of energy storage units (102),
generate a signal indicative of charging the plurality of energy storage units (102) based on the data received from the plurality of energy storage units (102), and
communicate the signal to the charger unit (104) for controlling the charging operation of the plurality of energy storage units (102).
2. The system (100) as claimed in claim 1, comprising one or more Battery Management System (BMS) (108), the one or more BMS (108) being in communication with each of the plurality of energy storage units (102), and configured to continuously monitor the one or more state parameters of the plurality of energy storage units (102).

3. The system (100) as claimed in claim 2, wherein the one or more BMS (108) of each of the plurality of energy storage units (102) being configured to send the data to the control unit (106).

4. The system (100) as claimed in claim 1, wherein the charger unit (104) comprises an output terminal being connected to an input terminal of the plurality of energy storage units (102).

5. The system (100) as claimed in claim 1, wherein the control unit (106) being configured to control charging of the plurality of energy storage units (102), the charging operation being one of a series charging and a parallel charging, and wherein the charging operation being parallel charging when the one or more state parameters of each of the plurality of energy storage units (102) being within a pre-set range.

6. The system (100) as claimed in claim 1, wherein the one or more of state parameters of the plurality of energy storage units (102) comprises at least one of a State of Charge (SOC), a State of Health (SOH), temperature, operating current, operating voltage, operating power and a rate of discharge.

7. The system (100) as claimed in claim 5, wherein the plurality of energy storage units (102) being charged during the series charging in a sequential manner, wherein the sequential manner being based on the one or more state parameters of the plurality of energy storage units (102).

8. The system (100) as claimed in claim 7, wherein the control unit (106) being configured to receive the one or more state parameters of the plurality of energy storage units (102) and determine an imbalance in the plurality of energy storage units (102), wherein the control unit (106) being configured to communicate the charging operation being one of series charging and parallel charging based on the determined imbalance in the plurality of energy storage units (102).

9. The system (100) as claimed in claim 7, wherein the control unit (106) being configured to categorize the BMS (108) of one or more BMS (108) of an energy storage unit having at least one of a higher deterioration of charge or a lower SOC as a master BMS, and further categorize the BMS’s (108) of the remaining energy storage units as slave BMS’s, and wherein the control unit (106) being configured to communicably connect with the master BMS and initiate charging operation of the energy storage unit coupled with the master BMS.

10. The system (100) as claimed in claim 9, wherein the control unit (106) being configured to turn ON charging operation of the energy storage unit of the plurality of energy storage units (102) associated with master BMS (108), and keep hold the charging of the plurality of energy storage units (102) associated with slave BMS’s (108) until the pre-set range of SOC of each of the plurality of energy storage units (102) being reached.

11. The system (100) as claimed in claim 9, wherein when the SOC of the plurality of energy storage units (102) having reached the pre-set range, the control unit (106) being configured to:
remove categorization of the BMS (108) as the master and the slave;
communicatively connect with each of the one or more BMS; and
initiate charging of the plurality of energy storage units in the parallel charging.

12. A method (200) for controlling charging operation of a plurality of energy storage units (102), the method (200) comprising:
receiving (204), by a control unit (106), an input from a charger unit (104), the input being indicative of the establishment of a communication of the charger unit (104) with the plurality of energy storage units (102);
receiving (206), by the control unit (106), a data indicative of one or more state parameters from each of the plurality of energy storage units (102);
generating (208), by the control unit (106), a signal indicative of charging the plurality of energy storage units (102) based on the data received from the plurality of energy storage units (102); and
communicating (210), by the control unit (106), the signal to the charger unit (104) for controlling the charging operation of the plurality of energy storage units (102).

13. The method (200) as claimed in claim 12, comprising monitoring continuously the one or more state parameters of each of the plurality of energy storage units (102) by one or more Battery Management System (BMS) (108), and sending data to the control unit (106) by the BMS (108) of each of the plurality of energy storage units (102), the data being indicative of the one or more state parameters of each of the energy storage units (102).

14. The method (200) as claimed in claim 12, comprising the charging operation being one of a series charging and a parallel charging, and wherein the charging operation being parallel charging when the one or more state parameters of each of the plurality of energy storage units (102) being within a pre-set range.

15. The method (200) as claimed in claim 14, wherein the one or more state parameters of the plurality of energy storage units (102) comprises at least one of a State of Charge (SOC), a State of Health (SOH), temperature, operating current, operating voltage, operating power and a rate of discharge.

16. The method (200) as claimed in claim 14, comprising series charging in a sequential manner, wherein the sequential manner being based on the one or more state parameters of the plurality of energy storage units (102).

17. The method (200) as claimed in claim 12, comprising receiving (206) by the control unit (106) the one or more state parameters of the plurality of energy storage units (102), and determining, by the control unit (106) an imbalance in the plurality of energy storage units (102), wherein the control unit (106) being configured to communicate (208) the charging operation being one of series charging and parallel charging based on the determined imbalance in the plurality of energy storage units (102).

18. The method (200) as claimed in claim 12, comprising categorizing, by the control unit (106) the BMS (108) of the one or more BMS (108) of an energy storage unit (102) having at least one of a higher deterioration of charge or a lower SOC as a master BMS, and further categorize the BMS’s (108) of the remaining energy storage units as slave BMS’s, and wherein the control unit (106) being configured to communicably connect with the master BMS and initiate charging operation of the energy storage unit coupled with the master BMS.

19. The method (200) as claimed in claim 12, comprising turning ON, by the control unit (106), charging operation of the energy storage unit of the plurality of energy storage units (102) associated with master BMS (108), and keep hold the charging of the plurality of energy storage units (102) associated with slave BMS’s (108) until the pre-set range of SOC of each of the plurality of energy storage units (102) being reached.

20. The method (200) as claimed in claim 18 comprising when the SOC of the one or more energy storage units (102) having reached the pre-set range, the control unit being configured to:

remove categorization of the BMS as the master and the slave;
communicatively connect with each of the one or more BMS; and
initiate charging of the plurality of energy storage units in parallel charging.