FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
The patent Rule, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
“A THEFT PREVENTION SYSTEM FOR AN ELECTRIC VEHICLE AND A METHOD
THEREOF”
MINDA CORPORATION LIMITED of E-5/2, Chakan Industrial Area, Phase- III M.I.D.C. Nanekarwadi, Tal: Khed, Dist., Pune, Maharashtra, 410-501, India
The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF THE PRSENT INVENTION
The present invention relates to a theft deterrent scheme for electric vehicle. Particularly it relates to a theft prevention system and method for protecting electric vehicle by applying electric shock from an on-board (traction) battery supply.
[001]
BACKGROUND OF THE PRESENT INVENTION
[002] Anti-theft system for any vehicle acts as a reaction that gets activated when vehicle is touched in an unauthorized manner by the intruder/thief. Generally it produces warning in terms of alarm sound or light flash etc. to reach the effect of caution, to frighten the intruder. Yet the intruder could be able to manage to remove cautions, such as the alarm and light by exercising some circuit tricks. Some technologies also make use of electricity for vehicle security purpose. It may include a safety device for the protection of vehicles, motorcycles, doors, fences, safety boxes etc. using third-party circuits, which provides electric shock to the intruder. These technologies are utilized as a safety measure from the vehicle theft for IC engine based vehicles.
[003] A general IC engine and an electric vehicle (EV) is different in many ways. Absence of high voltage batteries in IC engine vehicles leads to use of external apparatus e. g. electrodes, voltage boosters etc. for generating required voltage for provisioning electric shock to the intruders or thieves. In case of EV, high voltage traction battery having range of 60 Volt DC to 600 Volt DC is available to supply the power to the battery, motor controller and remaining units of EV. This power could be used to apply mild shock to the unauthorized intruder, trying to steal the vehicle.
[004] One of the prior art includes anti-theft device for protecting vehicle from an intruder by applying mild shock. Such device comprises of two conductors and an electric shock unit having complex and costly parts such as a high-voltage generator, a power supply as well as a starter, which lead to complex design for designing electric shock unit. The anti-theft device

is placed at the door knob in such prior art anti-theft devices.
[005] Some other prior art relates to design of safety devices for the protection of vehicles, such as motorcycles, doors, fences, safety boxes etc. using third-party circuits, which provides electric shock to the intruder. Safety devices may comprise of oscillator circuit, which takes current from normal 12 V battery. The circuit comprised of the connection of a zener diode to an integrated oscillator circuit that has output to a capacitor, a linear potentiometer, a fixing capacitor and a transistor. This transistor is connected to an oscillator coil, which in turn connects to a power transistor and is followed by a high voltage generation coil which connects a capacitor and a protective diode. Electric discharge arcs are generated from this assembly for applying shock to the person trying to steal the vehicle. However, the prior art does not exhibit usage of only internal battery for generating sufficient high voltage for generation of shock to the intruder, without the aid of external apparatus. This external apparatus increases weight and cost of the circuit.
[006] One more prior art includes violence-proof electric shock device for vehicles. The system includes voltage boosting circuit, a triggering circuit, a start-up circuit, a timing circuit, a sound alarm circuit and a metal electricity discharge body. The electric shock discharge device is arranged on the seat of the vehicle. The prior art lags use of single high voltage supply without using the voltage boosting circuit.
[007] Thus, there exists a need for the technology that solves above-mentioned problems and overcome the disadvantages or difficulties of existing prior art and/or techniques associated therewith. Particularly, there exists a need for techniques that can indicate the theft deterrence through application of shock from the inbuilt traction battery itself, which is very simple in design and avoid using very complex and costly parts. .
SUMMARY OF THE PRESENT INVENTION
[008] The present disclosure overcomes one or more shortcomings of the prior art and provides additional advantages discussed throughout the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other

embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
[009] The present disclosure presents a theft prevention system for an electric vehicle having a high voltage traction battery. It proposes an improved and efficient technique of applying a mild shock to an unauthorized user trying to steal the electric vehicle. The technique allows to provide the mild shock to the unauthorized user using an on-board high voltage traction battery, thereby eliminating the need for any other high voltage components required to provide the shock to the unauthorized user.
[010] In one non-limiting embodiment of the present disclosure, a theft prevention system
for an electric vehicle having a high voltage traction battery is disclosed. The system comprises an authenticating unit for authenticating a user accessing the vehicle, and a mild electric shock unit having a normally open switch. The mild electric shock unit is configured to apply a mild electric shock to the user when the switch is closed. The system further comprises a control unit coupled to the authentication unit and the mild electric shock unit. The control unit is configured to control open and close operation of the switch. Further, the control unit is configured to close the switch upon receiving an unauthorized user access command from the authentication unit.
[011] In another non-limiting embodiment of the present disclosure, the mild electric
shock unit comprises the high voltage traction battery and a voltage divider circuit. The voltage divider circuit consists of: high value series resistances R1 and R2 connected between a positive and negative terminal of the high voltage traction battery, and a voltage divider between the R1 and R2. Further, the high value series resistances R1 and R2 provide isolation between the high voltage traction battery and the chassis. Further, the mild electric shock unit further comprises a third resistance R3 connected to resistance R1. The one end of the switch is connected to the voltage divider point and the other end is connected to R3 in such a way that when the switch is closed the resistance R3 comes in parallel to resistance R1.
[012] In still another non-limiting embodiment of the present disclosure, the

authentication system configured to open the switch upon successfully authenticating the user.
[013] In still another non-limiting embodiment of the present disclosure, the authentication unit verifies authenticity of the user via a communication device and configured to send the unauthorized user access command upon determining that the user is unauthorized user.
[014] In still another non-limiting embodiment of the present disclosure, the communication device is a key fob.
[015] In still another non-limiting embodiment of the present disclosure, the electric vehicle is any electric automobile including but not limited to two-wheeler, three wheeler, or four wheeler.
[016] In yet another non-limiting embodiment of the present disclosure, wherein when the vehicle is two-wheeler vehicle, metal mesh is attached to at least one of vehicle body parts such as including but not limited to handle or seat of the vehicle.
[017] In still another non-limiting embodiment of the present disclosure, wherein when the vehicle is three or four-wheeler vehicle, metal mesh is attached to at least one of vehicle body parts such as including but not limited to a handle or steering, a seat, a door knob of the vehicle, so that when the user enters the vehicle and touches at least one of said vehicle parts, body of the user come across any of the resistances R1 or R2 and get connected to the chassis through R3.
[018] In yet another non-limiting embodiment of the present disclosure, wherein when the switch is opened, the mild electric shock unit pass current from the battery to the chassis ground through the resistances R1 or R2 without intervening the body of the user, and wherein when the switch is closed, the mild electric shock unit pass current from the battery to the body of the user through parallel resistances R1 and R3.

[019] In yet another non-limiting embodiment of the present disclosure, wherein the switch is a relay switch or transistorized switch or an intelligent power switch.
[020] In another non-limiting embodiment of the present disclosure, a theft prevention method for an electric vehicle having a high voltage traction battery is disclosed. The method comprises steps of: authenticating, by an authentication unit, a user access of the vehicle, and receiving, at a control unit, an unauthorized user access command from the authentication unit upon determining that user is unauthorized. The method further comprising step of closing, by the control unit, a normally open switch of a mild electric shock unit upon receiving the unauthorized user access. At last, the method comprising step of applying, by a mild electric shock unit, a mild electric shock to the user upon closure of the switch. The method furthermore discloses that the control unit controls open and close operation of the switch.
[021] In yet another non-limiting embodiment of the present disclosure, the method further comprising opening the switch upon successfully authenticating the user.
[022] In yet another non-limiting embodiment of the present disclosure, the authentication step comprises verifying authenticity of the user using a key fob, and sending the unauthorized user access command upon determining that the user is unauthorized user.
[023] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments and features will become apparent by reference to the drawings and the following detailed description.
OBJECTS OF THE INVENTION
[024] The main object of the present disclosure is to provide anti-theft solution by applying mild shock to the unauthorized intruder trying to steal the vehicle.
[025] Another object of the present disclosure is to make use of on-board high voltage

power supply to apply mild shock to the unauthorized intruder, trying to steal the vehicle.
[026] Yet another object of the present disclosure is to isolate the electric shock circuit in normal condition when authentic user is touching the vehicle.
[027] Yet another object of the present disclosure is to reduce the cost for complex external
circuitry required to provide mild shock to the unauthorized intruder trying to steal the vehicle.
EFFECTS/ADVANTAGES OF THE PRESENT INVENTION
[028] The present disclosure aims to provide an anti-theft solution by applying mild shock
to the unauthorized user trying to steal the vehicle using an on-board high voltage traction battery of the electric vehicle. The present disclosure is directed towards an activation of mild electric shock circuit and apply mild electric shock to an unauthorized person tries to steal the vehicle. The present disclosure also provides isolation to the electric shock unit in normal condition when the authentic user is touching the metal mesh is attached to at least one of vehicle body parts such as including but not limited to handle or seat of the vehicle of a four wheeler electric vehicle or metal mesh is attached to at least one of vehicle body parts such as including but not limited to a handle or steering, a seat, a door knob of the vehicle, so that when the user enters the vehicle and touches at least one of said vehicle parts of a two wheeler electric vehicle. The present disclosure allows to reduce the size and weight by eliminating external voltage boosting circuit for generating high voltage, thereby reducing the cost for external circuitry as it was incurred in an IC engine based vehicle.
[029] Other related advantages of the present disclosure are reduced weight and packaging size of the proposed system.
BRIEF DESCRIPTION OF DRAWINGS:
[030] The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate exemplary embodiments and, together with the description, serve to

explain the disclosed embodiments. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system and/or methods in accordance with embodiments of the present subject matter are now described, by way of example only, and with reference to the accompanying figures, in which:
[031] FIG. 1 illustrates a block diagram showing key elements/components of a theft prevention system for an electric vehicle, according to an embodiment of the present disclosure.
[032] FIG. 2 illustrates a circuit diagram of Mild Electric Shock Unit of the theft prevention system, according to an embodiment of the present disclosure.
[033] FIG. 3 discloses a flowchart of a theft prevention method for an electric vehicle, according to an embodiment of present disclosure.
[034] It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative systems embodying the principles of the present subject matter.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
[035] Referring now to the drawings, there is shown an illustrative embodiment of the disclosure “A theft prevention system and method for an electric vehicle having a high voltage traction battery”. It is understood that the disclosure is susceptible to various modifications and alternative forms; specific embodiments thereof have been shown by way of example in the drawings and will be described in detail below. It will be appreciated as the description proceeds that the disclosure may be realized in different embodiments.
[036] In the present document, the word “exemplary” is used herein to mean “serving as an example, instance, or illustration”. Any embodiment or implementation of the present

subject matter described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.
[037] While the disclosure is susceptible to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the drawings and will be described in detail below. It should be understood, however that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.
[038] The terms “comprises”, “comprising”, “include(s)”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, system or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or system or method. In other words, one or more elements in a system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.
[039] According to an aspect of the present disclosure, a technique for theft prevention for an electric vehicle having a high voltage traction battery is disclosed. The disclosed technique allows to prevent entry of intruder/or unauthorized user into the electrical vehicle by providing a mild electric shock using an on-board high voltage traction battery of the electric vehicle. The technique discloses a control unit which controls open and close operation of a switch. The control unit configured to close the switch upon receiving an unauthorized user access command from an authentication unit.
[040] In another aspect of the present disclosure, the technique further discloses that a mild electric shock unit comprises the high voltage traction battery, a voltage divider circuit. The voltage divider circuit consists of a high value series resistances R1 and R2 connected between a positive and negative terminal of the high voltage traction battery, and a voltage divider between R1 and R2. The technique furthermore discloses a chassis of the electric vehicle connected to a voltage divider point of the voltage divider circuit. The high value

series resistances R1 and R2 provide isolation between the high voltage traction battery and the chassis. The mild electric shock unit comprises a third resistance R3 connected to R1. The technique discloses that one end of the switch is connected to the voltage divider point and the other end to R3 in such a way that when the switch is closed the resistance R3 comes in parallel to resistance R1
[041] According to another aspect of the present disclosure, the above technique allows
to provide an anti-theft solution by applying mild shock to the unauthorized user, who is trying to steal the vehicle, using an on-board high voltage traction battery of the electric vehicle. This is achieved by attaching patches of conductive thin metal wire mesh across a steering wheel or seat or door knob or alike. These mesh structures will be alternately connected to positive terminal and chassis ground of the electric vehicle. Whenever any human being touches any of the two terminals standing on the chassis, the circuit will get completed through the body, and a mild electric current, which is not hazardous and life threatening will flow through the body of the intruder or unauthorized user. In normal circumstances, when the vehicle user touches the components of an electric vehicle, in general, e.g. steering wheel, seat, door etc., these terminals will not be connected to any of the theft deterrent circuitry as discussed in detail below, electric vehicle was handled by an authenticated and authorized user. Hence, the electric shock circuit is not activated due to open state of a normally open switch. The technique illustrates the activation of mild electric shock circuit by the closure of switch, when authorized user goes away from the electric vehicle rendering it sensitive for the threat of theft and apply mild electric shock to an unauthorized person who touches the specified parts of the electric vehicle as mentioned above.
[042] In the following detailed description of the embodiments of the disclosure, reference is made to the accompanying drawings that form a part thereof and are shown by way of illustration of specific embodiments in which the disclosure may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the disclosure, and it is to be understood that other embodiments may be utilized and that changes may be made without departing from the scope of the present disclosure. The following description is, therefore, not to be taken in a limiting sense.

[043] FIG. 1 shows a block diagram of an environment 100 indicating an interaction between various components of a theft prevention system 101 for an electric vehicle having a high voltage traction battery according to an embodiment of the present disclosure.
[044] In an exemplary embodiment, the theft prevention system 101 comprises an authentication unit 102, a control unit 104 and a mild electric shock unit 106. In an exemplary embodiment, the system 101 may reside inside an electric vehicle (not shown). In another exemplary embodiment, the electric vehicle may refer to any one of two-wheeler vehicles, three-wheeler vehicles, or four-wheeler vehicles etc. Further, the authentication unit 102 is configured to authenticate a user accessing the electric vehicle. The authentication unit 102 verifies authenticity of the user accessing the vehicle via a communication device. In an exemplary embodiment, the communication device may refer to key fob or mobile device or alike. For example, if a user is accessing the vehicle through the stipulated authorized key fob, then the user may be considered as authorized user. In another case, if a user accessing the vehicle without the key fob and tries to access the vehicle, the authentication unit 102 may provide a unique code on registered mobile device of the owner of the vehicle. Then the owner of the vehicle may provide the code and the authentication unit 102 may allow the owner to access the vehicle upon the successful authentication of the owner. However, the description is not limited thereto.
[045] Further, the authentication unit 102 is configured to send the unauthorized user access command upon determining that the user is unauthorized user. For example, if a user is accessing the vehicle by any other unauthorized means other than using the stipulated authorized key fob and authentication means, then the authentication unit 102 may send an unauthorized access command to the control unit 104. In an embodiment, the control unit 104 may be communicably coupled to the authentication unit 102 and the mild electric shock unit 106. Upon receiving the unauthorized access command from the authentication unit, the control unit may control the operation of the mild electronic shock unit to apply a mild electric shock to the user.

[046] In another exemplary embodiment, the system 100 may comprise a memory (not shown) which may be communicatively coupled to the control unit 104 or authentication unit 102 or mild electric shock unit 106 to serve the purpose of the invention. In a non-limiting example, memory may be an external memory chip, as a part of system 100 component or an inbuilt EEPROM memory, within control unit 104. In an embodiment, the memory may be a computer-readable medium known in the art including, for example, volatile memory, such as static random access memory (SRAM) and dynamic random access memory (DRAM), and/or synchronous dynamic random-access memory (SDRAM) and/or non-volatile memory, such as read only memory (ROM), erasable programmable ROM, flash memories, hard disks, optical disks, and magnetic tapes.
[047] In an embodiment, the data/information may be stored within the memory in the form of various data structures. As also indicated in earlier paragraphs, the information is the related to authentication codes, user data, etc. The memory may also store other data such as temporary data and temporary files, generated by the various units 102-106 for performing the various functions of the system 100.
[048] While the components 102-106 are illustrated and described herein with respect to theft prevention system 100 may form essential components to carry out the present disclosure, it may be worth noted that the theft prevention system 100 may comprise other/additional components as well which are not shown for the sake of brevity and are used in conjunction with the illustrated components to implement present disclosure.
[049] The detailed explanation of the mild electric shock unit 106 of the theft prevention system 100 for an electric vehicle is provided in FIG. 2.
[050] FIG. 2 shows a circuit diagram of a mild electric shock unit 200 (mild electric shock unit 106 of FIG. 1) of a theft prevention system for an electric vehicle having a high voltage traction battery, in accordance with an embodiment of the present voltage disclosure.

[051] In an exemplary embodiment as shown in Fig. 2, the mild electric shock unit 200 illustrates an isolation circuit 202 which comprises the high voltage traction battery, a voltage divider circuit, and a chassis. The voltage divider circuit may comprise a high value series resistances R1 and R2 connected between a positive terminal and a negative terminal of the high voltage traction battery. In a given embodiment, the voltage of the high voltage traction battery may be 60 volt DC to 600 volt DC, the values of the high value series resistances R1 and R2 each may be enumerated as 0.3 MΩ. Further, as shown in the figure, the voltage divider circuit may comprise a voltage divider between R1 and R2 and the voltage divider may comprise a voltage divider point. Furthermore, the chassis of the electric vehicle is connected to a voltage divider point of the voltage divider circuit.
[052] The mild electric shock unit 106 may further comprises a normally open switch “S”. The mild electric shock unit 106 may be configured to apply a mild electric shock to the user upon closing the switch. The switch may refer to any one of a relay switch or a transistorized switch or an intelligent power switch or alike. The control unit 104 may be configured to control open and close operation of a switch. In an embodiment, the control unit 104 may be configured to close the switch upon receiving an authorized user access command from the authentication unit 102. However, the description is not limited thereto.
[053] In a condition when the switch is opened, the mild electric shock unit 200 passes current from the high voltage traction battery to the chassis ground through the resistances R1 or R2 without intervening the body of the user.
[054] For more illustrative purposes, referring back to paragraph [044], based upon the determination that the user accessing the vehicle is an authorized user, the isolation circuit protects the vehicle owner or user from the shock. The isolation circuit is used to restrict the current through the human body far below hazardous level. For example, an authorized user touches a positive terminal will reduce the effective resistance from chassis to the positive terminal. The current through the user’s body will be restricted by R1. Similarly, if the authorized user touches a negative terminal, effective resistance from chassis to negative terminal will be reduced and R2 will restrict the current through the user’s body, thus

mitigating shock hazard. In an exemplary embodiment, it may be worth noted that in the isolation network/circuit 202 the resistance R1 and R2 both act like current limiters mitigating shock hazard. However, the description is not limited thereto.
[055] In another exemplary embodiment of the present disclosure, the mild electric shock unit 200 may further comprise a third resistance R3 connected to resistance R1. In the above examples where the values of each of the resistances R1 and R2 may be enumerated as 0.3 MΩ, value of the resistance R3 may be enumerated as 6 MΩ. In another embodiment, the figure 2 illustrates that one end of the switch is connected to the voltage divider point and the other end is connected to R3 in such a way that when the switch is closed, the resistance R3 comes in parallel to resistance R1. In another exemplary embodiment, when the switch is closed, the mild electric shock unit 200 passes the current from the high voltage traction battery to the body of the user through the parallel resistances R1 and R3. For example, referring back to paragraph [045] upon receiving an unauthorized user command from the authentication unit 102, the control unit 104 closes the switch for applying a mild shock. Therefore, when an intruder’s body or unauthorized user’s body simultaneously touches both positive terminal and the chassis, a resistance R3 is switched in across R2 for a very small amount of time (around a second) such that a controlled current less than the safe threshold of 2 mA passes through the intruder’s body or unauthorized user’s body. This will apply a sudden mild shock which is sustainable by the intruder’s body or unauthorized user’s body and thus deterring him from stealing the vehicle by driving away.
[056] In an exemplary embodiment of the present disclosure, the electric vehicle may be any electric automobile including but not limited to two-wheeler, three wheeler or four wheeler. Further, when the vehicle is a two-wheeler vehicle, metal mesh may be attached to at least one of vehicle body parts such as including but not limited to handle or seat of the vehicle. In another exemplary embodiment, when the vehicle is three or four-wheeler vehicle, metal mesh may attached to at least one of vehicle body parts such as including but not limited to a handle or steering, a seat, a door knob of the vehicle, so that when the user enters the vehicle and touches at least one of the above-mentioned vehicle body parts, body of the user come across any of the resistances R1 or R2 and get connected to the chassis through R3.

[057] FIG. 3 discloses a flowchart of a theft prevention method for an electric vehicle having a high voltage traction battery, according to an embodiment of present disclosure. The method starts at block 302 by authenticating a user access of the vehicle. The vehicle may be any electric automobile including but not limited to two-wheeler, three-wheeler, or four-wheeler. The authentication step may be performed by verifying authenticity of the user using a key fob. In an embodiment of the present disclosure, the authentication unit 102 of figure 1 verifies authenticity of the user accessing the vehicle via any other a communication device other than the key fob.
[058] At block 304, the method may comprise step of receiving, at a control unit, an unauthorized user access command from the authentication unit upon determining that user is unauthorized. For example, if a user is accessing the vehicle by any other unauthorized means other than the key fob and authentication means, then the authentication unit 102 may send an unauthorized access command to the control unit 104.
[059] At block 306, the method may comprise step of closing, by the control unit, a normally open switch of a mild electric shock to the user upon closure of the switch. At block 308, the method may comprise step of applying, by a mild electric shock unit, a mild electric shock to the user upon closure of the switch. In an embodiment, the one end of the switch is connected to the voltage divider point and the other end is connected to R3 in such a way that when the switch is closed the resistance R3 comes in parallel to resistance R1. In another exemplary embodiment, when the switch is closed, the mild electric shock unit 200 passes the current from the high voltage traction battery to the body of the user through the parallel resistances R1 and R3. For example, referring back to paragraph [045] upon receiving an unauthorized user command from the authentication unit 102, the control unit 104 closes the switch for applying a mild shock. Therefore, when an intruder’s body or unauthorized user’s body simultaneously touches both positive terminal and the chassis, a much smaller resistance R3 is switched in across R2 for a very small amount of time (around a second) such that a controlled current less than the safe threshold of 2 mA passes through the intruder’s body or unauthorized user’s body. This will apply a sudden shock which is sustainable by the intruder’s body or unauthorized user’s body and thus deterring him from stealing the vehicle by driving away.

[060] In an exemplary embodiment, the method may further comprise step of opening the switch upon successfully authenticating the user. When the switch is opened, the mild electric shock unit 200 passes current from the high voltage traction battery to the chassis ground through the resistances R1 or R2 without intervening the body of the user. Thus, based upon the determination that user accessing the vehicle is an authorized user the isolation circuit protects the vehicle owner or user from the shock. The isolation circuit is used to restrict the current through the human body far below hazardous level.
[061] The above illustrated steps provide an anti-theft solution by applying mild shock to
the unauthorized user trying to steal the vehicle using an on-board high voltage traction battery of the electric vehicle. The method illustrates the activation of electric shock circuit and apply mild electric shock to an unauthorized person who touches the stipulated parts of the electric vehicle. The method also provide isolation to the electric shock unit in normal condition when the authentic user is touching the stipulated parts of the electric vehicle.
[062] The illustrated steps are set out to explain the exemplary embodiments shown, and it should be anticipated that ongoing technological development will change the manner in which particular functions are performed. These examples are presented herein for purposes of illustration, and not limitation. Further, the boundaries of the functional building blocks have been arbitrarily defined herein for the convenience of the description. Alternative boundaries can be defined so long as the specified functions and relationships thereof are appropriately performed.
[063] Furthermore, one or more computer-readable storage media may be utilized in implementing embodiments consistent with the present disclosure. A computer-readable storage medium refers to any type of physical memory on which information or data readable by a processor may be stored. Thus, a computer-readable storage medium may store instructions for execution by one or more processors, including instructions for causing the processor(s) to perform steps or stages consistent with the embodiments described herein. The term “computer- readable medium” should be understood to include tangible items and

exclude carrier waves and transient signals, i.e., are non-transitory. Examples include random access memory (RAM), read-only memory (ROM), volatile memory, nonvolatile memory, hard drives, CD ROMs, DVDs, flash drives, disks, and any other known physical storage media.
[064] Suitable processors include, by way of example, a general-purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine.
[065] Those of skill would further appreciate that the various illustrative blocks, units, modules and algorithm steps described in connection with the aspects disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
[066] While the present disclosure has been described by way of example and in terms of the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
[067] Reference Numerals:

100 System
102 Authentication Unit
104 Control Unit
106 Mild Electric Shock Unit
200 Mild Electric Shock Unit Circuit Diagram
202 Isolation Circuit
300 Method Flowchart
302-308 Method steps

WE CLAIM:
1. A theft prevention system for an electric vehicle having a high voltage traction battery, the
system comprising:
an authentication unit for authenticating a user accessing the vehicle;
a mild electric shock unit having a normally open switch, wherein the mild electric shock unit is configured to apply a mild electric shock to the user when the switch is closed; and
a control unit coupled to the authentication unit and the mild electric shock unit, the control unit configured to control open and close operation of the switch, wherein the control unit configured to close the switch upon receiving an unauthorized user access command from the authentication unit,
wherein the mild electric shock unit comprises:
the high voltage traction battery;
a voltage divider circuit, the voltage divider circuit consists of: a high value series resistances R1 and R2 connected between a positive and negative terminal of the high voltage traction battery, and a voltage divider between R1 and R2, wherein a chassis of the vehicle is connected to a voltage divider point of the voltage divider circuit, wherein the high value series resistances R1 and R2 provide isolation between the high voltage traction battery and the chassis; and
a third resistance R3 connected to resistance R1,
wherein one end of the switch is connected to the voltage divider point and the other end is connected to R3 in such a way that when the switch is closed the resistance R3 comes in parallel to resistance R1, wherein R3 is much less than resistance R2.
2. The system as claimed in claim 1, wherein the authentication unit configured to open the switch upon successfully authenticating the user, wherein the authentication unit verifies authenticity of the user via a communication device and configured to send the unauthorized user access command upon determining that the user is unauthorized user.
3. The system as claimed in claim 2, wherein the communication device is a key fob.

4. The system as claimed in claim 1, wherein the electric vehicle is any electric automobile including but not limited to two wheeler, three wheeler or four wheeler.
5. The system as claimed in clam 4, wherein when the vehicle is two-wheeler vehicle, metal mesh is attached to at least one of vehicle body parts such as including but not limited to handle or seat of the vehicle,
wherein when the vehicle is three or four-wheeler vehicle, metal mesh is attached to at least one of vehicle body parts such as including but not limited to a handle or steering, a seat, a door knob of the vehicle, so that when the user enters the vehicle and touches at least one of said vehicle parts, body of the user come across any of the resistances R1 or R2 and get connected to the chassis through R3.
6. The system as claimed in claim 1, wherein when the switch is opened, the mild electric shock
unit pass current from the battery to the chassis ground through the resistances R1 or R2 without
intervening the body of the user, and
wherein when the switch is closed, the mild electric shock unit pass current from the battery to the body of the user through parallel resistances R1 and R3.
7. The system as claimed in claim 1, wherein the switch is a relay switch or transistorized switch or an intelligent power switch.
8. A theft prevention method for an electric vehicle having a high voltage traction battery, the method comprising:
authenticating, by an authentication unit, a user access of the vehicle;
receiving, at a control unit, an unauthorized user access command from the authentication unit upon determining that user is unauthorized;
closing, by the control unit, a normally open switch of a mild electric shock unit upon receiving the unauthorized user access;
applying, by a mild electric shock unit, a mild electric shock to the user upon closure of the switch,
wherein the control unit controls open and close operation of the switch.

9. The method as claimed in claim 8, further comprising opening the switch upon successfully
authenticating the user.
10. The method as claimed in claim 8, wherein the authentication step comprises:
verifying authenticity of the user using a key fob;
sending the unauthorized user access command upon determining that the user is unauthorized user.