Claims:CLAIMS
We Claim :
1. An apparatus for loading and unloading battery from the boot space under the seat in a two-wheeler, comprising:
a. battery storage compartment, said battery storage compartment configured to hold a battery;
b. said battery storage compartment, including 2 pivot pins on each side of the storage compartment and including slide-in slots, one of which is linear and the other is radial, said pivot pins configured to auto lock in an undercut groove during the operation of the vehicle;
c. said battery storage compartment including two springs mounted to resist the free fall of the battery;
d. said springs pre-tensioned in such a way that there is a positive locking when the battery reaches horizontal position.
2. The apparatus for loading and unloading battery from the boot space under the seat in a two-wheeler, as claimed in claim 1, wherein, springs are pre-tensioned in such a way that there is a positive locking when the battery reaches horizontal position, and avoids unlocking of the battery storage compartment due to any vibration during the operation of the vehicle.
3. The apparatus for loading and unloading battery from the boot space under the seat in a two-wheeler, as claimed in claim 1, wherein, two slots (one linear and another radial) along with two shafts on both sides of the battery storage compartment is configured to convert the linear motion of the battery storage compartment into rotational motion when the battery is pushed to the horizontal position and vice versa.
4. The apparatus for loading and unloading battery from the boot space under the seat in a two-wheeler, as claimed in claim 1, wherein springs are arranged with a slouch to reduce effort while moving the battery storage compartment from vertical to horizontal position and to resist free fall of battery.
5. The apparatus for loading and unloading battery from the boot space under the seat in a two-wheeler, as claimed in claim 1, wherein provision for auto air circulation is made in the battery storage compartment, allowing entry of cool air in to the battery storage compartment from front and exiting in the rear side, while riding the vehicle.
6. The apparatus for loading and unloading battery from the boot space under the seat in a two-wheeler, as claimed in claim 5, further including an inclined cooling duct with a perforated thermal absorption sheet configured to act as a filter.
7. A method of loading and unloading battery from the boot space under the seat in a two-wheeler, wherein the battery is held in a battery storage compartment and is configured to be tilted between horizontal and vertical position, utilizing 2 pivot pins on each side of the storage compartment and including slide-in slots, one of which is linear and the other is radial, wherein the entire operation is like a slouch.

Dated this the 01st of August 2021
Senthil Kumar B
Agent for the applicant
IN/PA-1549 , Description:
FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
Complete Specification
(See section 10 and rule 13)
1.Title of the Invention :

Two-Wheeler Electrical Vehicle – Battery Compartment Design for Swappable Battery

2. Applicant
Name Nationality Address
NDS ECO MOTORS PVT LTD.,

Indian

SREE BALAJI NILAYA, 9TH MAIN, CHOWDESHWARI LAYOUT, MARATHAHALLI, BANGALORE 560037

3. Preamble to the Description :
The following specification particularly describes the invention and the manner in which it is to be performed.

This specification comprises an improvement in the invention claimed in the specification of the main patent application No. 202141005371 dated 09/02/2021
4. DESCRIPTION
Field of the Invention
The present invention is related to the field of Mechanical Engineering.
Background of the invention
Vehicles using sustainable energy sources, such as electricity, are becoming more prevalent as an alternative to combustion-engine vehicles. An electric or hybrid vehicle that has at least one electric traction motor typically has a battery pack or other enclosure that contains one or more electrochemical cells that provide propulsion energy for the motor. Because the process of charging such cells usually takes some amount of time, some vehicles are designed in such a way that the battery can be swapped with another battery or removed for charging.

A battery Compartment is an enclosure to keep the battery safe and secure in an Electric vehicle (two-wheeler). As the battery compartment is directly mounted in the vehicle chassis frame, the battery compartment is non-removable and the life span is the entire life span of the vehicle. Wherein the battery compartment is located under the boot i.e. seat. The battery compartment is designed to rotate from a horizontal position to a vertical position when the battery needs to be removed or swapped from the vehicle. This functionality is required due to less availability of boot space and maximizes the space under the seat case.
Detailed Description of the invention
A battery compartment is used to enclose the battery in an electric two-wheeler. The battery is a very important part of the vehicle for its continuous operation and consumes large space in an electric vehicle. Due to this, the boot space reduces. To increase the boot space, the battery must be positioned in near-horizontal condition, but this makes the removal of battery very challenging. To remove the battery easily, the battery must be brought to a near-vertical position. This is achieved by the mechanism which will allow the battery compartment to tilt with two pivot points within the space available. The battery compartment is assisted with a slouch mechanism* which will allow smooth operation and reduces human effort.
Slouch Mechanism: - It is selectively moveable between upright position to reclined position and includes pivotally coupled frames. Here the upright position is mentioned as vertically and the reclined position as horizontal.
Main feature:
The battery compartment is having two sets of pivot points about which it rotates from the nearly horizontal position (15 degrees concerning ground surface) to the near-vertical position (75 degrees from concerning ground) during swapping of the battery and position it back to the horizontal.

Locking is provided in the battery compartment in horizontal condition for keeping the battery in a safe condition while the vehicle is in operation.
Spring-loaded for ease of lifting and closing the battery compartment.
This invention discloses a novel method of allowing the battery compartment to tilt in an electrical vehicle for easy swapping of the battery (in existing vehicles, the battery compartment is stationary and welded to the chassis which decreases the boot space availability and it also doesn’t allow for battery swapping).
This invention is also a novel apparatus for easy swapping of the battery to tilt the battery from vertical position to horizontal position and vice versa. The linear motion is getting converted into rotational motion when the battery is pushed to the horizontal position by providing two slots (one linear and one radial) with two shafts on both sides of the battery compartment.

Two springs have been mounted to resist the free fall of the battery due to gravity and it reduces human effort by preloading the springs.
The mechanism also has a feature to position the battery compartment in a firm position to avoid rotation during vehicle movements. The springs are pre-tensioned in such a way that there is a positive locking when the battery reaches a horizontal position, which avoids unlocking of the battery compartment due to any vibration during the operation of the vehicle which in turn helps the battery compartment to keep in the same position. The battery compartment will lock automatically when it reaches the horizontal position. It can’t be removed without unlocking and applying the force. This is provided to keep the battery compartment in a firm position.
Figure 2 in the annexed drawings shows the position of the battery compartment during the operation of the vehicle. In this position, the battery compartment is in locked condition to avoid vibrations of the battery.

Figure 4 in the annexed drawings shows the position of the battery compartment in the vertical position, in which the battery will be removed or replaced.
Working Principle:
The battery compartment has 2 pivot pins on each side in which slide-in slots are provided. When the battery compartment is in vertical condition for the removal or replacement of the battery, the position of the two pivots/Pinpoints (point A) and (Point B)] is as shown in figure 5 (a). In this position, the two springs (spring C and Spring D) are in the stretched condition. Due to the stretching of the spring, it becomes easy for the user to push the battery to a horizontal position with little effort. As the Pivot/pin A is pushed downward to point A1, Pivot/pin B will slide in the curved slot in the upward direction to B1 to bring the battery to the horizontal position as shown in figure 5(b). But the challenge to bring the battery down to a horizontal position is the space constraint. The mechanism is designed in such a way that the linear motion is getting converted to rotational motion. When the pivot/pin A is coming down in the vertical direction in the linear slot, the linear motion is getting converted into rotational motion with the movement of pivot/pin B in the curved slot. Once it reaches the horizontal position, the pivot/pin A and B points are pushed to final positions A2 and B2 in the horizontal direction in both the slots on both sides of the battery compartment simultaneously as shown in figure 5 (c). The final position will lead to positive locking of the battery compartment as an undercut groove is provided at the end position. This avoids the rotation of the battery compartment while the vehicle is in operating condition. The battery compartment is also locked in the axial direction with the help of a lock mechanism, this also acts as a safety system by locking the battery to the chassis.
Fig 6 (a) The configuration in the vehicle assembly shows the battery compartment in the vertical position. In this configuration, the initial positions of the spring and pins in the linear slot and the curved slot is shown.

Fig 6 (b) The configuration in the vehicle assembly shows the battery compartment in the horizontal position.
Fig 6 (c) The configuration in the vehicle assembly shows the battery compartment in the horizontal final position. In this configuration, the pivot pins sit in an undercut grove. This undercut provides positive locking to keep the battery compartment firmly. The battery compartment is also locked Unless the lock is removed, the battery compartment can’t be removed.
A cooling duct with a perforated thermal absorption sheet as a filter is placed inside the perforated duct which absorbs the heat when the air hits. The cool air enters the battery storage compartment when the vehicle is moving. The cooling duct is placed inclined to the battery storage compartment which will allow the air to pass inside the battery storage compartment through the holes provided on the front side of the battery storage compartment and collect the dust and water by gravity as shown in the figure 8a and 8b.

Because of the cooling duct placed in the battery compartment, the air circulation arrangement is made in the battery compartment which allows the cool air to pass through the surrounding of the battery and take the heat out of the battery. As the battery pack is provided with fins for efficient cooling of the battery. The Fins also acts as stiffeners providing extra support to the battery pack which avoids dent and shock to the battery pack.
The battery case is designed with the profile of fins on the outer surface as shown in Figures 10 which has a higher thickness on the inside and a larger surface on the outside, due to this the battery case is stiffer and prevents damage. With a larger surface area of fins, the heat transfer is very effective.
Top and bottom covers are designed with a step all around which will take the load even during the drop and less load on the screws as shown in figure 11.
Gasket with a step is designed for top and bottom cover which tightly fits on the cover which does not allow water or dust inside the battery pack.
Description of drawings
Fig 1: Battery compartment design concept.
Fig 2: Battery compartment in the horizontal condition in the vehicle assembly.
Fig 3: Battery compartment cut section in horizontal condition (Vehicle operation).
Fig 4: Battery compartment in the vertical position (for Removing and swapping of the Battery).
Fig 5 (a): Pivot Point Positions on the bracket in the vertical condition of the battery compartment.
Fig 5 (b): Pivot Point Positions on the bracket in Horizontal condition of the battery compartment.
Fig 5 (c): Pivot point in locking condition.
Fig 6 (a): Pivot Point Positions on the bracket in the vertical condition of the battery compartment.
Fig 6 (b): Pivot Point Positions on the bracket in Horizontal condition of the battery compartment.
Fig 6(c): battery compartment in a horizontal final position wherein the lock is firmly latched.
Fig 7 (a) Auto air circulation arrangement is made in the battery compartment which allows the cool air to pass through surrounding the battery and take the heat out of the battery.
Fig 7 (b) The battery compartment is provided with fins for efficient cooling of the battery compartment. The Fins also acts as stiffeners providing extra support to the battery compartment avoiding dent and shock to the battery pack.
Fig 8 (a) & (b) A cooling duct with a perforated thermal absorption sheet as a filter is placed inside the perforated duct which absorbs the heat when the air hits. The cool air enters the battery storage compartment when the vehicle is moving. The cooling duct is placed inclined to the battery storage compartment which will allow the air to pass inside the battery storage compartment through the holes provided on the front side of the battery storage compartment and collect the dust and water by gravity.
Fig 9 The battery pack with aluminium extruded case, aluminium top and bottom lids, and external fin arrangements. The cool air entered into the battery compartment will pass through the battery compartment and fins on the battery pack effectively cooling the battery pack.
Fig 10 The battery case is designed with the profile of fins on the outer surface. The thickness on the inside and larger surface on the outside, due to this the battery case is stiffer and prevents damage. With a larger surface area of fins, the heat transfer is very effective.
Fig 11 Top and bottom covers are designed with a step all around which will take the load even during a drop and less load on the screws. Gasket with a step is designed for top and bottom cover which tightly fits on the cover which does not allow water or dust inside the battery pack.

Senthil Kumar B
(Agent for the applicant)
IN/PA-1549