Claims:CLAIMS
We Claim :
1. An apparatus to swap battery in a two-wheeler, comprising:
a. battery box, said battery box configured to hold a battery;
b. said battery box, including 2 pivot pins on each side of the box and including slide-in slots, one of which is linear and the other is radial, said pivot pins sitting in an undercut groove;
c. said battery box 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 to swap battery 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 box due to any vibration during the operation of the vehicle.
3. The apparatus to swap battery in a two-wheeler as claimed in claim 1, wherein, two slots (one linear and one radial) along with two shafts on both sides of the battery box is configured to convert the linear motion of the battery box into rotational motion when the battery is pushed to horizontal position.
4. A method of swapping battery in a two-wheeler, wherein the battery is held in a battery box and is configured to be tilted between horizontal and vertical position, by means of 2 pivot pins on each side of the box and including slide-in slots, one of which is linear and the other is radial.
Dated this the 09th February 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 Cabin Design for Swappable Batteries

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.

4. DESCRIPTION
Field of the Invention
The present invention is related to the field of Mechanical Engineering.
Background of the invention
Battery box is an enclosure to keep the battery safe and secure in an electric two-wheeler during the entire life of the vehicle. The battery box has to rotate from horizontal position to vertical position when the battery needs to be removed from the vehicle. This functionality is required due to less available boot space and maximize the space under the seat case.
Detailed Description of the invention
Battery box is used to enclose the battery in an electric two-wheeler. The battery is 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 removal battery very challenging. To remove the battery easily, battery must be brought to near vertical position. This is achieved by mechanism which will allow the battery box to tilt with two pivot points within the space available. The battery box is assisted with spring mechanism which will allow smooth operation and reduces human effort.
Main feature: The battery box is having two set of pivot points about which it rotates from near horizontal position (15 degree with respect to ground surface) to near vertical position (75 degree from with respect to ground) during swapping of the battery and positioning it back to the horizontal.
Locking is provided in the battery box in horizontal condition for keeping the battery in safe condition while vehicle is in operation.
Spring loaded for ease of lifting and closing the battery box.
This invention discloses a novel method of allowing the battery box to tilt in an electrical vehicle (in existing vehicles the battery box is stationary and welded to the chassis) for easy swapping of the battery.
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 horizontal position by providing two slots (one linear and one radial) with two shafts on both sides of the battery box.
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 box in a firm position to avoid the rotation during vehicle movements. The springs are pre-tensioned in such a way that there is a positive locking when the battery reaches horizontal position, which avoids unlocking of the battery box due to any vibration during the operation of the vehicle which in turn helps the battery box to keep in same position. Battery box will lock automatically when it reaches to horizontal position. It can’t be removed without unlocking and applying the force. This is provided to keep the battery box in a firm position.
Figure 2 in the annexed drawings shows the position of the battery box during the operation of the vehicle. In this position, battery box is in locked condition to avoid vibrations of the battery.
Figure 4 in the annexed drawings shows the position of the battery box in vertical position, in which the battery will be removed and replaced
Working Principle:
Battery box has 2 pivot pins on each side in which slide-in slots provided. When the battery box is in vertical condition for the removal and replacement of the battery, the position of the two pivot/Pin points [Yellow (point A) and Red (Point B)] are as shown in figure 5 (a). In this position, the two springs (spring C and Spring D) are in stretched condition. Due to the stretching of the spring, it becomes easy for the user to push the battery to horizontal position with little effort. As the Pivot/pin A (yellow) is pushed downward to point A’, Pivot/pin B (red) will slide in the curved slot in the upward direction to B’ to bring the battery to horizontal position as shown in figure 5(b). But the challenge to bring the battery down to 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 to the horizontal position, the pivot/pin A and B points are pushed to final position A” and B” in horizontal direction in both the slots on both sides of the battery box simultaneously as shown in figure 5 (c). The final position will lead to positive locking of the battery box as an undercut grove is provided at the end position. This avoids the rotation of the battery box while vehicle is in operating condition. The battery box is also locked in axial direction with the help of lock mechanism, this also acts as a safety system by locking the battery to chassis.

Fig 6 (a) The configuration in the vehicle assembly shows the battery box in vertical position. In this configuration, the initial positions of the spring and pins in the linear slot and curved slot is shown
Fig 6 (b) The configuration in the vehicle assembly shows the battery box in horizontal position.
Fig 6 (c) The configuration in the vehicle assembly shows the battery box in horizontal final position. In this configuration, the pivot pins sit in an undercut grove. This undercut provides a positive locking to keep the battery box firmly. The battery box is also locked Unless the lock is removed, the battery box can’t be removed.
Description of drawings
Fig 1: Battery box design concept
Fig 2 : Battery box in horizontal condition in the vehicle assembly
Fig 3 : Battery box cut section in horizontal condition (Vehicle operation)
Fig 4 : Battery box in vertical position (for Removal of the Battery)
Fig 5 (a) : Pivot Point Positions on the bracket in vertical condition of the battery box
Fig 5 (b) : Pivot Point Positions on the bracket in Horizontal condition of the battery box
Fig 5 (c) : Pivot point in locking condition
Fig 6 (a) : Pivot Point Positions on the bracket in vertical condition of the battery box
Fig 6 (b) : Pivot Point Positions on the bracket in Horizontal condition of the battery box
Fig 6(c) : battery box in horizontal final position

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