Patent Application
20220355768
The present invention relates to a lifting tool to be used when replacing a battery pack in an electric vehicle. By using the lifting tool, a battery pack can be removed from and inserted to confined spaces from the side of the vehicle.
Electric vehicles are getting more and more popular. Electric passenger cars are widely used, and also electric buses used in urban areas are slowly increasing in numbers. An advantage of using electric buses in urban areas is that the travelled distance is relatively short, and there are end stations where the charge of the battery can be replenished. The battery may even be replenished at some of the bus stops with a quick charger.
One disadvantage of urban electric buses is that the wear of the battery is higher than in passenger cars. An electric bus is heavier than a passenger car, the required power to drive the bus is higher and the battery must thus be larger. Further, the charging current of the battery must be high in order to keep the buses rolling without many delays. The wear of the battery is thus relatively large.
The battery pack or packs of a bus must thus be relatively easy to exchange, both when the battery pack must be replaced and when the battery is to be removed for service. A battery pack of a bus may weigh up to 600 kg and more, and the bus may comprise more than one such battery pack. Further, the space around the battery pack is limited, which means that it may be difficult to reach the sides or the rear side of the battery pack when the battery pack is to be removed.
U.S. Pat. No. 5,664,932 describes an underground mining vehicle provided with a replaceable battery pack and a pivoted lifting device mounted to the vehicle. Two arms arranged on each side of the battery pack lifts a replaced battery pack from ground up to the use position for the battery pack. This battery replacement system works fine for this type of vehicle, but has several disadvantages for other vehicles. The lifting device is relatively heavy when compared to the weight of the battery pack. Further, the lifting device is relatively large and takes up useful space, and finally, the battery is to be used outside of the vehicle.
SE 201350751 discloses a carrier frame for a battery pack of a reach truck. The battery pack stands on the carrier frame both when loading/unloading the battery pack and when in use in the reach truck. A forklift will lift the carrier frame with the battery pack by the underside of the carrier frame.
US 20150114736 describes a quick loading and unloading battery system for electric vehicles, where two lift arms holds the sides of the battery through longitudinal openings. The arms are provided on a lift jack that lifts the battery and positions the battery on specific mounts in the vehicle.
These different battery lifting assemblies functions well for the specific use they are designed for, but require relatively large room around the battery pack when removing and mounting the battery pack, and are only suitable for vehicles having a single battery pack.
There is thus room for an improved lifting tool for a battery pack.
An object of the invention is therefore to provide an improved lifting tool for a battery pack. A further object of the invention is to provide an improved method for replacing a battery pack.
In an lifting tool for replacing a battery pack in an electric vehicle, comprising a body having a lifting interface that is attachable to an external lifting aid, further comprising a first arm provided with a first lifting arrangement and a second arm provided with a second lifting arrangement, where the battery pack is adapted to be positioned between the arms when the lifting tool is to lift and hold a battery pack, the object of the invention is achieved in that the lifting tool comprises a first locking pin and a second locking pin, where the first locking pin is adapted to be inserted horizontally through a first outer connection member and a first inner connection member of the first lifting arrangement and a first outer lifting opening and a first inner lifting opening of a first side of the battery pack, and where the second locking pin is adapted to be inserted horizontally through a second outer connection member and a second inner connection member of the second lifting arrangement and a second outer lifting opening and a second inner lifting opening of a second side of the battery pack, such that the locking pins secure the battery pack to the lifting tool.
With the lifting tool according to the invention, a battery pack for an electric vehicle can easily be removed from the vehicle or inserted into the vehicle even if the space around the battery pack is limited. This is advantageous especially for heavy vehicles having a large and heavy battery pack that is rectangular, and that is designed to be replaced in an easy manner. Battery packs in passenger cars are often integrated in the design of the vehicle and are not intended to be replaced. It is often difficult to reach and to remove such a battery pack. The battery pack in passenger cars is also often divided in several parts placed at different locations in the passenger cars, in order to use the available space and/or to lower the centre of gravity. In a heavy vehicle, the battery pack is often rectangular and if several battery packs are used, they are often the same size and type. In an electric bus, two or three battery packs may be used, e.g. two stacked on top of each other at the rear of the bus, and one arranged under the floor. The battery packs at the rear are reached from the rear of the bus, and the battery pack under the floor is reached from one side of the bus.
With the inventive lifting tool, the battery pack can be lifted in a compact manner. The lifting tool comprises two lifting arms that are arranged spaced apart in a sideway direction such that they can be positioned on each side of the battery pack. Each arm comprises outer and inner connection members that are adapted to cooperate with outer and inner lifting openings in the frame brackets of the battery pack. With the connection members and the lifting openings aligned, locking pins are inserted through the connection members and the lifting openings, which secures the battery pack to the lifting arms. The battery pack can then safely be removed from the vehicle. In this way, it is possible to attach the battery pack to the lifting arms from the outside of the vehicle without requiring access to the inner side of the battery. The space of the vehicle can thus be used in a more efficient way.
The lifting arms are mounted to the body of the lifting tool. The body is in one example adapted to be carried by a forklift and comprises in this example two tubes into which the forks of the forklift are inserted. With the forklift, the battery pack can be removed from or inserted into the vehicle.
In another example, the body comprises a lower frame adapted to be placed on a pallet loader or the like. The pallet loader can be raised or lowered manually by an operator such that the battery pack can be removed from or inserted into the vehicle. The arms of the lifting tool may be attached at different height positions of the body such that the lifting tool can be adapted to battery packs arranged at different heights. With a pallet loader, the height of the lifting tool can be fine-tuned manually when lifting a battery pack.
The outer and inner connection members of the lifting arms may be arranged on the lower side of the arms, extending downwards for the arms.
In this example, the connection members comprises holes that corresponds to the lifting openings of the battery pack. The holes of the connection members and the lifting openings of the battery pack are aligned with each other and the locking pins are inserted through the holes and openings, such that the battery pack is securely attached to the lifting arms of the lifting tool. By placing the connection member either on both inner sides or both outer sides of the frame bracket of the battery pack, the battery pack will be secured in both horizontal directions. In this way, the battery pack will also be secured in a vertical direction.
The connection members may also be integrated in the lifting arms, where at least the outer connection members form a recess in the lifting arms. The inner connection members may also be recesses or may be holes at the front end of the lifting arms. By using at least one recess, the battery pack will be secured in both horizontal directions. In this way, the battery pack will also be secured in a vertical direction.
In a method for manually removing a battery pack from an electric vehicle with a lifting tool, the steps of; positioning the battery pack between a first arm and a second arm of the lifting tool when the battery is positioned in the electric vehicle, adjusting the arms in height such that lifting arrangements of the arms are positioned adjacent and aligned with lifting openings of each side of the battery pack, inserting a locking pin through the lifting arrangements of each arm and the lifting openings of each side of the battery pack, lifting the battery pack with a lifting aid attached to the lifting tool, and removing the battery pack from the vehicle with the lifting aid are comprised.
By this first embodiment of the method, a battery pack in an electric vehicle can easily be removed from the vehicle by an operator. The battery pack is securely attached to the lifting arms of the lifting tool and held by the lifting tool during the removal of the battery pack. The battery pack is secured in both horizontal directions and in the vertical direction. The battery pack is secured to the lifting tool by the use of locking pins that are mounted to the battery pack from the outside of the vehicle. The battery pack can thus be attached to the lifting tool from the outside and does not require access to the inner part of the battery pack. This simplifies the attachment of the battery pack to the lifting tool.
The invention will be described in greater detail in the following, with reference to the attached drawings, in which
The embodiments of the invention with further developments described in the following are to be regarded only as examples and are in no way to limit the scope of the protection provided by the patent claims. The references to outer and inner refers to the position of a battery pack mounted in a vehicle.
The lifting tool comprises a first lifting arm 3 provided with a first lifting arrangement 6 and a second lifting arm 4 provided with a second lifting arrangement 7. The first arm and the second arm extends forwards from the body of the lifting tool. The distance between the arms corresponds to the width of a battery pack, such that a battery pack fits snuggly between the lifting arms. The lifting arrangements of the lifting arms are used to attach a battery pack to the lifting arms.
In the shown example, the first lifting arrangement 6 comprises a first outer connection member 8 that is positioned at the rear end of the first arm and that extends downwards from the first arm, and a first inner connection member 9 that is positioned at the front end of the first arm and that extends downwards from the first arm. The second lifting arrangement 7 comprises a second outer connection member 10 that is positioned at the rear end of the second arm and that extends downwards from the second arm, and a second inner connection member 11 that is positioned at the front end of the second arm and that extends downwards from the second arm. In this example, the connection members are flat brackets welded to the underside of the lifting arms, but other implementations are also possible. All connection members are provided with a hole 14 with a diameter that corresponds to a locking pin that is used to attach a battery pack to the lifting tool. The holes of an outer connection member and an inner connection member are aligned with each other. The distance between the outer connection member and the inner connection member of an arm corresponds in the shown example to the depth of a battery pack, but it is possible to position the lifting openings of a battery pack at other positions.
The battery pack 30 is in the shown example rectangular and is a relatively large battery pack with a high weight that requires some kind of lifting aid to handle. A typical battery pack for a heavy vehicle may have a weight of over 500 kg or more. The battery pack is provided with two brackets 37, one on the front side and one on the rear side of the battery pack. The bracket extends outside of the first side 35 and the second side 36 of the battery pack. These extensions are at the first side 35 provided with a first outer lifting opening 31 and a first inner lifting opening 32 and are at the second side 36 provided with a second outer lifting opening 33 and a second inner lifting opening 34. These lifting openings are adapted to align with the connection members of the lifting tool.
When a battery pack is to be removed or replaced, the lifting tool is picked up by a lifting aid, in this case a forklift, where the forks of the forklift are inserted into the tubes 19, 20 of the lifting tool. The lifting tool is lowered towards the battery pack, as shown in
To attach the battery pack to the lifting tool, as shown in
The lifting tool comprises a first lifting arm 3 provided with a first lifting arrangement 6 and a second lifting arm 4 provided with a second lifting arrangement 7. The first arm and the second arm extends forwards from the body of the lifting tool. The distance between the arms corresponds to the width of a battery pack, such that a battery pack fits snuggly between the lifting arms. The lifting arrangements of the lifting arms are used to attach a battery pack to the lifting arms.
In the shown example, the first lifting arrangement 6 comprises a first recess 15 arranged at the middle of the first arm, and a hole at the front end 17 of the first arm for the first locking pin. The first recess is also provided with a hole (not shown) for the first locking pin. The second lifting arrangement 7 comprises a second recess 16 arranged at the middle of the second arm, and a hole at the front end 18 of the second arm for the first locking pin. The second recess is also provided with a hole (not shown) for the second locking pin. The diameter of the holes corresponds to a locking pin that is used to attach a battery pack to the lifting tool. The holes of the recesses are aligned with the holes at the front ends of the arms. The distance between the recess and the front end of an arm corresponds to the depth of a battery pack.
When a battery pack is to be replaced, the battery pack is either raised towards the lifting tool by an external lifting aid, if a new battery is to be attached to the lifting tool, or the lifting tool is lowered towards the battery pack if the battery pack is installed in a vehicle, as shown in
To attach the battery pack to the lifting tool, as shown in
The lifting arms may be attached to the body in a removable manner. In this way, the lifting arms may be attached to the body in different positions, i.e. at different heights, such that the lifting tool is adapted to lift battery packs arranged at different heights in a vehicle. In one example, two battery packs are placed above each other at the rear of a bus. With this lifting tool, both battery packs can be removed or inserted with the same lifting tool.
In step 100, the battery pack is positioned between a first arm and a second arm of the lifting tool when the battery is still positioned in the electric vehicle. The arms of the lifting tool are set to a height that is higher than the lifting height, such that the arms can be inserted on each side of the battery pack. The lifting arrangements of the arms are positioned adjacent and above the lifting openings of each side of the battery pack.
In step 110, the arms of the lifting tool are adjusted in height, in this case lowered, such that the lifting arrangements of the arms are aligned with the lifting openings of each side of the battery pack.
In step 120, a locking pin is inserted horizontally through the lifting arrangements of each arm and the lifting openings of each side of the battery pack. The locking pins are inserted from the outside of the vehicle. This will attach the battery pack to the lifting tool in a secure manner
In step 130, the battery pack is lifted from the support surface of the vehicle with a lifting aid attached to the lifting tool.
In step 140, the battery pack is removed from the vehicle with the lifting aid, by pulling the lifting tool with the battery pack rearwards from the vehicle. The battery pack is now removed from the vehicle, and a new battery can be inserted into the vehicle by reversing the method.
The invention is not to be regarded as being limited to the embodiments described above, a number of additional variants and modifications being possible within the scope of the subsequent patent claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 21172349.9 | May 2021 | EP | regional |
