Range extender for an electric bicycle

Abstract

The application relates to a range extender (3) for electric bicycles. The range extender (3) comprises a rechargeable battery (9), a control unit (15), and an interface for charging the battery (9) and supplying power to internal components of the electric bicycle (1). The housing (25) has a compact, preferably cylindrical design. The control unit (15) allows communication with the bicycle's (1) internal systems. A holding device (5) secures the range extender (3) to the bicycle (1) and enables energy transfer between the range extender (3) and internal components of the electric bicycle (1). The interface for charging the battery (9) and / or supplying power to a load comprises an inductive coil (24).

Description

[0001] RANGE EXTENDER FOR AN ELECTRIC BICYCLE

[0002] The application generally relates to an electric bicycle, and more particularly to a range extender with a holding device designed to enhance the operational capabilities of electric bicycles.

[0003] Reference is made to the earlier patent applications DE 10 2024 129 795.6 of 15 October 2024, EP 25208701 .0 of 14 October 2025 and EP 25208705.1 of 14 October 2025, the priorities of which are herewith claimed, and the contents of which are herein incorporated by reference.

[0004] Generally, an electric bicycle refers to a bicycle that is equipped with an electric motor and a rechargeable battery, which together provide supplementary power to assist the rider during operation. The electric motor can be activated to either fully or partially drive the bicycle, reducing the physical effort required by the rider, particularly when traveling uphill, against strong winds, or over long distances. Electric bicycles typically feature an integrated bicycle control unit that manages the interaction between the motor, the battery, and the rider’s input through pedals.

[0005] Electric bicycles are commonly designed to be similar in structure to traditional bicycles, with added components such as a motor, battery, and control unit, often integrated into the frame. These components can vary in terms of power capacity, range, and functionality. In most cases, electric bicycles allow for both manual pedaling and electric assistance, making them versatile for different terrains and commuting needs.

[0006] Electric bicycles have gained widespread popularity as a sustainable mode of transportation, yet they are often limited by their battery life, especially for longdistance travel.

[0007] In automotive applications, a range extender is known as for example a fuel-based auxiliary power unit that extends the range of a battery-powered vehicle by driving an electric generator to charge the vehicle’s battery. This arrangement, referred to as a series hybrid drivetrain, typically relies on internal combustion engines as the most commonly used range extenders.

[0008] However, such range extenders are not suitable for bicycles due to their complexity, weight, size, and cost.

[0009] EP 3 901 024 A1 describes a bicycle frame, comprising a tube section having a receiving space for receiving at least one battery unit, suitable as a source of energy for an electromotive bicycle drive. The bicycle frame further comprises battery guiding means, for guiding the battery unit along a first axis between an insertion position and a temporary mounting position in the receiving space. The bicycle frame further comprises battery locking means, for locking and / or unlocking the battery unit in the receiving space in a final mounting position. Electrical connection between the battery unit and a part to be connected is established using connection means which are provided as conductive connection means such as a connector and especially as a "plug and receiver"- arrangement, provided at the frame and the battery unit, respectively.

[0010] DE 102020215 895 A1 describes a charging device, an electrically drivable means of transportation and a device for accommodating a replaceable electrochemical energy store of an electrically drivable means of transportation. The charging device comprises a first base part for fixing the device in a periphery and a contact carrier for receiving the electrochemical energy store and for electrical energy transmission to the electrochemical energy store or from the electrochemical energy store and a bolt for locking the electrochemical energy store in the device during the energy transfer, the contact carrier being transferrable from a first position into a second position in the first base part. DE 10 2020 215 895 A1 focuses on galvanic (conductive) contacts for energy transmission between the contact carrier and the electrochemical energy store and further emphasizes that conductive wiring is less prone to faults and is also preferable in terms of energy consumption and wear and tear.

[0011] US 2020 / 0 231 247 A1 describes a power unit for powering an electric bike, the power unit comprising a power supply, a control module connected to the power supply and configured to manage the power output by the power unit, a holder for supporting the power supply and control module, a power connector for connecting the power unit to an electric motor, a control connector for connecting the power unit to an input device, and an attachment device for attaching the power unit to a bike.

[0012] CN 2 16 232 804 U describes a carbon fiber bicycle structure with a battery hidden in a lower tube. The carbon fiber bicycle structure comprises a bicycle frame and a controller, a touch display arranged on the side face of a bicycle handlebar at the end, close to the bicycle frame, of a bicycle front fork, and a battery switch knob arranged on a surface of the top of the end, close to the touch display, of the bicycle frame.

[0013] EP 4 417 501 A1 describes an electric drive system for an assisted pedaling bicycle, the system comprising a battery holder with an attachment portion for attaching the battery holder externally to a frame tube of a bicycle. The battery holder comprises a battery holding portion. The system further comprises a battery arranged to be removably received in the battery holding portion of the battery holder, an electric hub motor for mounting on the front or rear wheel of the bicycle, and a motor controller for controlling the power delivered to the hub motor from the battery.

[0014] The object of the application is therefore to provide a range extender specifically designed for electric bicycles, a means for integrating such a range extender into an electric bicycle and an electric bicycle with the possibility of achieving a long range.

[0015] The object of the application is solved by the features of the independent claims. Advantageous embodiments of the application are described in the dependent claims.

[0016] In a first aspect, the application relates to a range extender for an electric bicycle. The range extender comprises a housing, a rechargeable battery, a control unit, an interface for coupling the battery to a charging device for charging the battery as well as an interface for coupling the battery to a load for supplying power to the load.

[0017] The proposed range extender is particularly suited for electric bicycles, as it does not include a generator or similar components for producing electricity, which allows it to be significantly smaller compared to range extenders used in automotive applications. Notably, all components are housed within a compact enclosure, making the range extender easy for the user to carry. The range extender can be charged separately from the bicycle and connected to the bicycle as needed.

[0018] In simple terms, the range extender can be understood as an energy reservoir that can receive, store and release energy as required. When receiving energy, it acts as a load; when storing energy, it acts as a storage; and when releasing energy, it acts as a power source for a load.

[0019] Preferably a load refers to any device or system that consumes electrical energy supplied by a power source. In the context of the application, a load can include components such as a smartphone, the battery of an electric bicycle, or the electric motor of the bicycle. Essentially, a load is anything that requires electrical power to operate. When the range extender supplies power to these devices, they are considered the load. Conversely, when the range extender itself is receiving power (e.g., during charging), it acts as the load in that scenario.

[0020] The control unit comprises a communication unit which is capable of being in data communication with an electrics bicycle’s control unit. The integration of a control unit with communication capabilities allows for seamless interaction between the range extender and the electric bicycle's control unit, enabling real-time data exchange for optimized power management and performance monitoring. Furthermore, the control unit allows the user to configure whether the range extender should supply power to a load or receive energy to charge its battery.

[0021] Preferably, the communication unit is capable of wireless communication and includes a transmitter and a receiver. This enables the control unit of the range extender to communicate with the bicycle's control unit or external devices such as smartphones using various technologies, as for example, Bluetooth, Wi-Fi, NFC or 5G etc. The capability for wireless communication allows for remote monitoring, control, and firmware updates without the need for physical access to the device. In particular, the inclusion of both a transmitter and receiver ensures bidirectional communication, facilitating not only the reception of commands and data but also the transmission of status updates and alerts from the range extender to the user or other connected devices. The control unit of the range extender may also comprise a processor and a memory to process and store data. In some embodiments, the range extender may comprise a display where output generated by the control unit can be visualized. In further embodiments, it is also possible to visualize the output on an external device, such as a smartphone, connected to the range extender control unit.

[0022] Further, the range extender’s control unit or communication unit can also support wired communication. In this regard, the range extender may be equipped with a male or female part of a plug connection to facilitate data transfer via cables, such as a USB- C port for connecting data cables to the communication unit. This provides a reliable and versatile option for high-speed, secure data transfer when wireless communication is not preferred or possible.

[0023] The housing may have a cylindrical form and is preferably shaped like a bottle. The housing provides a protective enclosure for the battery and electronics. The cylindrical, bottle-like shape offers an ergonomic and aesthetically appealing design that is easy to handle and can be conveniently stored or placed in a variety of settings. The familiar bottle shape enhances portability, as it can easily fit into standard bottle holders. This can be particularly advantageous when using multiple range extenders, allowing unused extenders to be conveniently stored in bottle holders, such as those on a backpack. The housing can be constructed from materials such as plastic (e.g., high- density polyethylene, ABS, polycarbonate), reinforced fiber composites (e.g., carbon fiber, fiberglass) or metal (e.g., aluminum, stainless steel).

[0024] The housing can be a unibody design or assembled from multiple parts, and may, for example, consist of a cover or cap and a main body.

[0025] The rechargeable battery is a central component of the range extender, designed to store and supply electrical energy to power the electric bicycle or connected external devices. Preferably, the battery uses lithium-ion technology. For example, a lithium-ion battery could provide around 160Wh of energy, sufficient for extending the range of an electric bicycle by 15-45 kilometers depending on usage. The range extender may have an LED light or speaker to indicate the charging status of the range extender.

[0026] There are various ways to design an interface for coupling the battery to a charging device and for coupling the battery to a load for supplying power. For example, a single structural component could be implemented, which, by switching modes, can either couple the battery to a charging device or to a load for supplying power. Alternatively, there could be two distinct interfaces or structural components, each dedicated to its respective function — one for charging the battery and the other for supplying power to the load.

[0027] Furthermore, an interface for energy transfer can either support wireless or wired transmission.

[0028] For a wireless transmission interface, the interface for charging the battery and / or supplying power to a load may comprises an inductive coil. The inductive coil enables energy transfer through inductive coupling.

[0029] Generally, inductive coupling is a method of wireless energy transfer in which energy is transmitted through electromagnetic fields between two coils. One coil, the primary coil, generates an alternating magnetic field when powered by electricity. This magnetic field induces a current in the second coil, the secondary coil, located nearby, allowing the transfer of energy without physical contact.

[0030] In the context of the range extender for an electric bicycle, inductive coupling can be used to wirelessly transfer energy between the range extender’s inductive coil and a charging device or a load such as an electric motor or an internal battery of an electric bicycle. When the range extender is positioned near the charging device or a compatible holder on the bike, the primary coil may generate a magnetic field that induces current in the range extender’s secondary coil, allowing the battery to be charged wirelessly. Similarly, the range extender can supply power to the bicycle’s battery using the same inductive method. This system eliminates the need for physical cables, reducing wear on connectors and providing a more convenient, user-friendly experience. Preferably, the range extender comprises an inductive coil capable of generating a magnetic field, where the range extender’s battery serves as a power source. The range extender’s control unit activates the corresponding circuits, allowing current to flow from the battery through the coil, generating a magnetic field. When a sensor (e.g. a hall sensor) detects a strong external magnetic field (for example, from an external coil or charging device), the range extender’s control unit can decide to allow energy intake. In this case, the control unit opens circuits that direct the generated voltage in the coil to the battery's charging input, allowing it to recharge. In this configuration, one inductive coil can serve as a transmitter and receiver coil.

[0031] The implementation of inductive energy transfer offers advantages over conventional wired systems with conductive energy transfer. Inductive coupling allows for wireless charging and discharging of the range extender by means of the inductive coil, thereby enabling energy transfer without direct physical contact. This wireless functionality eliminates or reduces mechanical wear and failure risks associated with traditional conductive plug-type connectors, improving system longevity and user convenience.

[0032] Furthermore, the inductive interface facilitates a more seamless and intuitive user experience by reducing the complexity of connecting the range extender to the bicycle or a charging station. The absence of exposed contacts improves robustness and enhances the environmental sealing of the housing, making the system more resilient to dirt, moisture, and vibration, which are common in mobile outdoor applications. The use of a dual-function inductive coil which is configured to operate both as a transmitting and receiving element permits bidirectional energy flow, enabling the device to operate flexibly either as a power source or as a receiver for battery charging.

[0033] The range extender may further comprise sensors, such as a magnetic field sensor (e.g., Hall sensor), to detect the presence of an external inductive field and to automatically switch operating modes between charging and discharging, thereby providing intelligent and autonomous energy management. The control unit can selectively activate charging or supply circuits based on contextual signals, user settings, or communication with the bicycle’s control system. The inductive energy transfer capability also enables improved modularity and portability. Because no precise physical alignment or direct cable connection is required, the range extender may be easily inserted into compatible holders — such as bottle cages — without complex assembly steps. This simplifies the use of multiple range extenders and supports extended travel distances without interruption.

[0034] Additionally, inductive power transfer facilitates safer operation in electrically sensitive or potentially hazardous environments, as the galvanic isolation between energy source and sink inherently reduces the risk of electrical short circuits or sparking events.

[0035] Overall, the integration of inductive energy transfer into the range extender design enables a compact, durable, and highly ergonomic energy module that is especially suitable for use in electric bicycles and related mobile applications. The combination of wireless energy transfer, environmental robustness, and intelligent control provides an efficient solution for extending the operational range of electric bicycles while enhancing user experience and safety.

[0036] In some embodiments, the interface may comprise two inductive coils - a transmitter coil and a receiver coil. Depending on whether energy is to be transmitted or received, the control unit activates the circuit of the corresponding coil.

[0037] The interface for charging the battery and / or supplying power to a load, particularly the inductive coil, can be positioned in a bottom section of the cylindrical housing. This design choice facilitates easy access to the interface, as it avoids the need to manipulate the extender to couple it to a power source or a load.

[0038] In this context, the bottom of the range extender preferably refers to the part of the range extender or housing that is closest to the center of the Earth, meaning the lowest portion of the range extender or housing when it rests on a surface. The bottom section refers preferably to the lower 0 -30% of the cylindrical housing. This section is typically positioned at the base, around 0 - 5 cm from the bottom edge of the cylinder, depending on the overall height of the device. The range extender may support wireless charging of its battery using standard Qi- compatible chargers.

[0039] The approach for enabling wired energy transfer can be implemented through an interface that includes either a male or female part of a plug connection for wire-based energy transmission. In this setup, the interface for charging the battery and / or supplying power to a load may feature a slot for connecting a cable, such as a USB-C cable. This allows for efficient, high-speed wired energy transfer, providing a reliable and secure connection for both charging and powering devices. The presence of a female or male part of a plug connection for wire-based data transfer ensures a secure and reliable physical connection, which can result in faster data transfer rates and reduced susceptibility to interference compared to wireless solutions. The provision of a slot for connecting a data cable, such as a USB-C cable, offers a universal and convenient method for connecting the extender to various devices.

[0040] In a further aspect the application relates to a holding device for a range extender to couple the range extender with an electric bicycle. The holding device comprises a receiving element for holding the range extender, fastening means for securely attaching the receiving element to a frame of the electric bicycle, and an interface capable of coupling the range extender’s battery to the internal battery and / or electric motor of the electric bicycle.

[0041] The holding device has two main functions. First, it ensures that the range extender is securely and stably carried during bicycle movement. Second, it enables the transfer of energy between the range extender and the bicycle's internal battery and / or electric motor, allowing energy to be supplied from the range extender to the internal battery or motor, or vice versa, allowing the internal battery to charge the range extender. The holding device not only allows the coupling of the range extender with the electric bicycle, it also allows using the interface to couple the electric bicycle with other external devices as for example smartphones or charging devices.

[0042] In this context, the interface may comprise an inductive coil. The incorporation of an inductive coil in the interface enables wireless energy transfer between the range extender and the electric bicycle components. It is apparent that the inductive coil is electrically coupled to the internal battery of the electric bicycle and / or the electric motor when the holding device is attached to the bike and in use. The absence of visible charging ports enhances the bicycles’ sleek and minimalist design.

[0043] The function of the interface with an inductive coil has already been described above in relation to the range extender. The same principles apply analogously to the holding device, and reference is made to the earlier explanations. Since the interface with the inductive coil is coupled to the electric bicycle's control unit, the control unit can analogously perform the same functions as the range extender’s control unit, which is connected to the interface or inductive coil of the range extender.

[0044] In some embodiments, the interface may comprise a male or female part of a plug connection for wire-based energy and / or data transfer. For example, the interface may include a slot for connecting a cable, such as a USB-C cable. It is understood that in the case of a plug connection, the holding device preferably contains the corresponding counterpart to the range extender, allowing them to be coupled together. For instance, if the holding device features a female part, the range extender would have a male part, enabling them to be connected securely for the purpose of transferring energy or data.

[0045] The receiving element is preferably a structure or body designed to accommodate a bottle-shaped or cylindrical body, such as the range extender described above. It may, for example, take the form of a tube with a bottom, or consist of other components that can securely hold and position the range extender.

[0046] For example, the receiving element comprises a clamping element and a base element connected to the clamping element. The clamping element is designed to exert or apply a clamping force to the outer surface of the range extender's housing, while the base element is arranged to contact a bottom of the housing of the range extender, in order to limit axial displacement, when a range extender is held by the receiving element. This design largely mirrors that of conventional bottle holders, making it visually inconspicuous and easy for users to operate. The clamping element provides a secure grip on the range extender’s housing, adaptable to various sizes and shapes, ensuring the range extender remains firmly in place, even when the electric bicycle is in motion. Moreover, the clamping element and the base element may be coupled by a rigid bar, the bar comprising fastening means for attaching the holding device to a frame of an electric bicycle. The rigid bar coupling between the clamping element and the base element ensures a stable and secure attachment of the holding device to the electric bicycle frame, which is essential for maintaining the position of the range extender during various riding conditions. The inclusion of fastening means on the bar allows for easy and adaptable installation of the holding device onto different frame designs, providing versatility and compatibility with a wide range of electric bicycle models.

[0047] The holding device, in particular the receiving element, the clamping element, the base element and / or the rigid bar, can be constructed from materials such as plastic (e.g., high-density polyethylene, ABS, polycarbonate), reinforced fiber composites (e.g., carbon fiber, fiberglass) or metal (e.g., aluminum, stainless steel).

[0048] The fastening means of the holding device may include form-locking connections, force-locking connections, and / or material-locking connections.

[0049] For example, form-locking connections could involve dovetail joints, tongue-and- groove systems, or pins and slots, where the shape of the parts interlocks them. Forcelocking connections may include screws, bolts with nuts, or clamping elements, where the connection is maintained by friction or applied pressure. Material-locking connections might involve adhesive bonding (such as using epoxy or super glue), welding, soldering, or riveting, where the materials are permanently fused together.

[0050] Preferably, the fastening means are designed to be detachable, allowing the holding device to be easily mounted and subsequently removed or reattached as needed

[0051] In a further aspect, the application relates to a kit comprising a range extender according to any of the aforementioned embodiments and a holding device according to any of the aforementioned embodiments. The kit allows for easy installation of the range extender, enabling even conventional electric bicycles to be upgraded. The holding device can be securely attached to the frame of the bicycle using the fastening means, and only the internal battery and / or the electric motor need to be connected to the interface of the holding device. Additionally, the kit not only facilitates the upgrading of standard electric bicycles but also simplifies the replacement of damaged components without the need to purchase a completely new bicycle.

[0052] In a further aspect, the application relates to an electric bicycle. The electric bicycle comprises an electric motor, an internal battery for supplying the electric motor with power, and a bicycle control unit and a range extender according to the aforementioned embodiments which is coupled to a holding device according to the aforementioned embodiments.

[0053] In this context, the holding device is attached to a frame of the electric bicycle via fastening means and the interface of the holding device is coupled to the internal battery and / or the electric motor. The integration of the range extender with the holding device attached to the bicycle frame allows for an efficient and compact power supply system, which can enhance the overall range of the electric bicycle without significantly altering its weight distribution or aesthetics.

[0054] The range extender is preferably configured to supply power to the internal battery and / or the electric motor via the holding device, either through an inductive coupling of the range extender and the holding device, or through a plug connection. In this context, it is apparent that the internal battery and / or the electric motor are on the other side preferably configured to receive power from the range extender via the holding device

[0055] Similarly, the range extender is preferably configured to receive power from the internal battery via the holding device, either through an inductive coupling of the range extender and the holding device, or through a plug connection. In this regard, it is apparent that the internal battery is preferably configured to supply power to the range extender via the holding device.

[0056] By connecting the internal components — such as the internal battery, and the motor, with the range extender through the holding device, the electric bicycle allows for flexible, bidirectional energy transfer. Depending on the rider's needs and the bike's operational requirements, energy can be efficiently distributed between the internal battery, motor, and range extender. The detachable nature of the range extender further enhances versatility, allowing users to carry additional units for extended journeys or share them between bikes. This modular approach simplifies maintenance and upgrades, making it easy for riders to manage and replace components without technical expertise. With both an internal battery and a detachable range extender, the electric bicycle features a dual-source energy system, offering extended range and redundancy to ensure continuous operation even if one power source is depleted.

[0057] The bicycle control unit comprises a processor, a memory and a data communication unit which is in data communication with components of the electric motor, the internal battery and the interface of the holding device, for example the inductive coil and / or a sensor which is included in the interface.

[0058] In some embodiments, the bicycle control unit comprises a transmitter and a receiver and is in wireless data communication with the range extender’s control unit, facilitating real-time data exchange for efficient energy management and performance optimization. The wireless data communication capability eliminates the need for physical wiring between the bicycle and the range extender, reducing the risk of connection failures due to wear and tear or harsh environmental conditions.

[0059] The bicycle control unit is configured to manage energy distribution and operation, including interactions between the internal battery, the electric motor, and the range extender. In simple words, it decides whether energy should be supplied, withdrawn, and to which component it should be directed. The bicycle control unit's ability to manage energy distribution and operation allows for intelligent control of the power flow between the internal battery, electric motor, and range extender, which can extend the overall range and improve the reliability of the electric bicycle. By coordinating interactions between the electric bicycle's key components, the control unit can enhance the riding experience through smoother acceleration, improved battery life, and adaptive power assistance based on riding conditions.

[0060] The bicycle control unit can, for example, manage the operation of the electric bicycle by ensuring that the range extender is discharged first, followed by the internal battery, or vice versa. It can also balance the discharge evenly between both power sources. Additionally, through energy management, the maximum power output for the electric motor can optionally be increased.

[0061] In some embodiments, the bicycle control unit is not in data communication with the range extender’s control unit, either because the range extender has all the aforementioned features but does not have a control unit capable of such communication, or because it is simply not desired, for example, due to safety reasons. Nevertheless, the bicycle control unit can manage the energy within the bicycle and, for instance, select which energy source — either the range extender or the internal battery — should be preferred to power the motor.

[0062] The internal battery is preferably located in the frame. Locating the internal battery within the frame of the electric bicycle offers a low center of gravity, which improves the overall stability and handling of the bicycle. The integration of the battery into the frame protects it from environmental elements and potential impact damage.

[0063] The electric bicycle may further comprise an additional interface for directly coupling the internal battery to a charging device or a load or for coupling the bicycle control unit with an external device. The additional interface can be regarded as a third interface, with the range extender's interface serving as the first interface and the holding device's interface as the second. The inclusion of an additional interface for direct coupling to a charging device or load provides versatility in charging options, enabling the user to charge the internal battery using various external power sources or to power external devices directly from the bicycle. The capability to couple the control unit with an external device opens up possibilities for advanced diagnostics, firmware updates, and customization of the electric bicycle's settings, contributing to improved maintenance and a personalized riding experience.

[0064] The additional interface may comprise an inductive coil. The additional interface comprising an inductive coil allows for wireless charging capabilities, which can simplify the charging process by eliminating the need for cables and connectors, thus reducing wear and potential damage from repeated physical connections. Reference is made to the above-mentioned interfaces with inductive coils in the range extender and holding device, as this interface comprising an inductive coil is designed analogously

[0065] The electric bicycle may comprise a kickstand for supporting the bicycle on the ground, and the inductive coil is integrated into the kickstand. Integrating the inductive coil into the kickstand ensures that the charging component is discreetly incorporated into the bicycle's design, maintaining the aesthetic appeal while providing a functional charging solution. The placement of the inductive coil within the kickstand positions it close to the ground, which is optimal for alignment with floor-mounted charging pads, and ensures stability during the charging process as the bicycle is supported upright.

[0066] The additional interface, particularly the inductive coil, can also be installed elsewhere within the electric bicycle, for example, in the frame or the luggage rack. For effective inductive coupling with a charging device or an external device, it is important that the inductive coil can easily be exposed to a magnetic field.

[0067] The electric bicycle may support wireless charging of its internal battery using standard Qi-compatible chargers via the additional interface or the interface of the holding device.

[0068] The additional interface may comprise a female or male part of a plug connection for wire-based energy and / or data transfer. The inclusion of a plug connection interface enhances the versatility of the bicycle by allowing for the direct integration of various electronic components that require a secure physical connection for reliable energy and / or data transfer. For example, the additional interface may comprise a slot for connecting a cable, such as a USB-C cable.

[0069] In a further aspect, the application relates to an energy management system for an electric bicycle comprising the electric bicycle according to any of the aforementioned embodiments and a charging device, wherein the charging device is configured to supply power to the range extender and / or the internal battery, and is capable of being coupled to the internal battery and / or the range extender via a wired or wireless connection. The charging device is designed to supply power to either the range extender or the internal battery of the electric bicycle. Wired charging solutions provide fast and efficient energy transfer, often using standard connectors like USB-C. Additionally, wireless charging technology, such as Qi, is being developed for electric bicycles, allowing riders to charge without physical cables.

[0070] In a further aspect, the application relates to a method for charging the electric bicycle according to any of the aforementioned embodiments, comprising the following steps: First, charging the battery of the range extender via a cable. Second, simultaneous or time-shifted charging of the internal battery of the electric bicycle by inductive coupling of the range extender and the holding device.

[0071] In a further aspect, the application relates to a method for charging the electric bicycle according to any of the aforementioned embodiments, comprising the following steps: First, charging of the internal battery of the electric bicycle via a cable. Second, simultaneous or time-shifted charging of the battery of the range extender by inductive coupling of the range extender and the holding device.

[0072] The disclosed methods enable efficient energy management by allowing the range extender's battery or the internal battery of the electric bicycle to be charged independently through a cable, ensuring that the electric bicycle can be quickly prepared for use even when the internal battery or the range extender’s battery is depleted. This charging methods reduce the need for multiple external charging sources, as the range extender or the internal battery can serve as an intermediary power source, simplifying the charging process for the user.

[0073] In a further aspect, the application relates to a method for charging the electric bicycle according to any of the aforementioned embodiments, comprising the following steps: First, charging of the internal battery of the electric bicycle via inductive coupling with a charging device. Second, optionally charging the range extender’s battery via inductive coupling between the internal battery and the range extender.

[0074] In this context, the internal battery can be charged either through the interface of the holding device or alternatively via an additional interface integrated into the electric bicycle. For instance, the electric bicycle may comprise a kickstand for supporting the bicycle on the ground, and the inductive coil is integrated into the kickstand. The method provides the convenience of charging the internal battery without the need for external cables, which can be particularly beneficial in outdoor or public spaces where access to power outlets may be limited. The optional inductive charging of the range extender's battery from the internal battery offers an additional layer of flexibility, allowing the user to charge the range extender even when away from traditional charging infrastructure.

[0075] In a further aspect, the application relates to a method for charging a smartphone via the electric bicycle according to any of the aforementioned embodiments, comprising the following steps: Inductive coupling of the smartphone with the range extender or the holding device. Alternatively, connecting the smartphone with the range extender, the holding device or an additional interface of the electric bicycle via a cable. The range extender’s battery and / or the internal battery of the electric bicycle may serve in both cases as a power source.

[0076] The ability to charge a smartphone via inductive coupling or a cable connection with the electric bicycle's range extender or holding device turns the bicycle into a mobile power station, providing added utility for the user.

[0077] Utilizing the electric bicycle's batteries as a power source for the smartphone can be particularly advantageous during long rides or trips where access to other charging options is unavailable.

[0078] The present disclosure is illustrated by way of example and not limited in the accompanying figures in which like reference numerals indicate similar elements. Embodiments of the application will now be described with reference to the attached drawings.

[0079] Modern electric bicycle (e-bike) battery systems face further practical and technical challenges that hinder user experience, system reliability, and integration with modem digital ecosystems. These challenges arise particularly when the battery is removed from the bicycle during storage, transport, maintenance, or pre-use planning and the user wishes to check the state of charge (SOC) of the battery or interact with the battery system.

[0080] One challenge lies in the activation of the battery management system (BMS) when the battery is detached from the bicycle. Existing systems rely on activation through the bicycle’s electronics, meaning the BMS cannot be conveniently accessed or controlled once the battery is removed from the bicycle. Early attempts to provide external control such as through optical switches have further challenges. These optical switches are sensitive to ambient light and therefore prone to accidental activation. Common switches require physical openings in the battery housing which creates sealing and durability concerns, especially in rugged or moisture-prone environments.

[0081] Another challenge arises from the lack of user-friendly BMS activation mechanisms that do not require physical interaction with the battery. While magnetic switches improve on common systems, a more seamless solution would involve wireless activation. However, wireless switching presents its own challenges, such as achieving sufficiently low idle power consumption, ensuring compatibility with standard consumer devices (e.g., smartphones), and enabling reliable communication even in powersaving conditions.

[0082] A further challenge relates to displaying the SOC and battery status to the user in a way that is power-efficient and visible under all lighting conditions. Known digital displays consume power continuously, making them unsuitable for long-term use on portable battery systems. Furthermore, they do not retain their display when the battery is off, leaving users uncertain about charge levels during storage or transport.

[0083] Today’s e-bike users further expect battery data such as SOC, health status, and remaining range to be accessible via their mobile devices such as smartphones. However, most battery systems lack standardized or energy-efficient wireless interfaces to allow passive querying or real-time data synchronization, especially without requiring the battery to be reinstalled into the bicycle. Fig. 1 shows a schematic overview of a preferred embodiment of the energy management system for an electric bicycle, which includes both the electric bicycle and a charging device.

[0084] Fig. 2 shows a schematic overview of a further preferred embodiment of the energy management system for an electric bicycle, encompassing both the electric bicycle and a charging device

[0085] Fig. 3 shows a preferred embodiment of a range extender and a holding device for coupling the range extender with an electric bicycle.

[0086] Fig. 4 shows a section of a preferred embodiment of an electric bicycle.

[0087] Fig. 5 shows a cross-sectional view of a preferred embodiment of a battery for an electric bicycle.

[0088] Fig. 6 shows a top view of a preferred embodiment of a battery for an electric bicycle.

[0089] Fig. 7 shows a top view of a further preferred embodiment of a battery for an electric bicycle.

[0090] Fig. 8 shows a cross-sectional view of a further preferred embodiment of a battery for an electric bicycle.

[0091] Fig. 9 shows a flow-diagram of a computer-implemented method for activating an energy storage management system of an energy storage for a powered device.

[0092] Fig. 10 shows a flow-diagram of a further computer-implemented method for activating an energy storage management system of an energy storage for a powered device.

[0093] Fig. 11 shows a flow-diagram of a further computer-implemented method for activating an energy storage management system of an energy storage for a powered device. Fig. 12 shows a flow-diagram of a computer-implemented method for displaying a state of charge of an energy storage for a powered device.

[0094] Fig. 13 shows a flow-diagram of a computer-implemented method for providing information relating to a state of charge of an energy storage for a powered device.

[0095] Some parts of the embodiments have similar or identical parts. The similar or identical parts may have the same names and / or reference number. The description of one part applies by reference to another similar part, where appropriate, thereby reducing repetition of text without limiting the disclosure.

[0096] Fig. 1 illustrates a schematic overview of a preferred embodiment of the energy management system 21 for an electric bicycle 1 , which includes both the electric bicycle 1 and a charging device 13.

[0097] The electric bicycle 1 comprises several components: a frame 19, an electric motor 7, an internal battery 9 that powers the motor 7, a bicycle control unit 11 , a range extender 3, and a holding device 5. Both the range extender 3 and the holding device 5 are equipped with inductive coils 23, 24. The holding device 5 is securely attached to the bicycle’s frame 19 using fastening means 33, and the range extender 3 is detachably mounted on the holding device 5.

[0098] This configuration allows the inductive coils 23, 24 of the holding device 5 and the range extender 3 to be coupled, enabling wireless energy transfer between them without the need for physical contact via cables 29. In particular, this facilitates the charging or powering process through electromagnetic induction. Since the holding device 5 is connected to the internal systems of the electric bicycle 1 , such as the internal battery 9, energy can be transferred to the bicycle’s internal battery 9 from the range extender 3. Likewise, energy from the internal battery 9 can be transferred back to the range extender 3 when needed.

[0099] Generally, inductive charging works by using a transmitter coil in one device (e.g., the range extender 3) and a receiver coil in another (e.g., the holding device 5). When the two coils 23, 24 are aligned, an alternating current in the transmitter coil creates a magnetic field, inducing a current in the receiver coil. This current can then be used to charge the internal battery 9 or power the electric motor 7.

[0100] The range extender 3 includes a control unit 15, allowing to configure whether the range extender 3 should supply energy from its battery or receive it. At the same time, the holding device 5 is connected to the bicycle control unit 11 , which can also be set up as needed to either release energy from the internal battery 9 or receive energy from the range extender 3.

[0101] In this regard, the range extender 3 can act as an auxiliary power source that can be replaced as needed due to its detachability. For example, when riding an electric bicycle 1 , a user can carry multiple range extenders 3 and replace a discharged range extender 3 with a fully charged one, thereby significantly increasing the range of riding the electric bicycle 1 with support of the electric motor 7.

[0102] The bicycle control unit 11 preferably comprises a processor, a memory, and a data communication unit, wherein the control unit 11 is in data communication with the electric motor 7, the internal battery 9, and the inductive coil 23 of the holding device 5. The bicycle control unit 11 preferably manages the energy distribution and operation of the electric bicycle 1 , including the interactions between the internal battery 9, the motor 7, and the range extender 3.

[0103] The charging device 13 is an external device that can provide power to the internal battery 9, the range extender 3, or both. It can connect to these components either through a wired or wireless connection. The wired connection can be designed in such a way that the charging device 13 is connected to the range extender 3 or the internal battery 9 via a USB-C cable 29, with both the internal battery 9 and the range extender 3 having compatible ports for this purpose. The wireless connection, on the other hand, is achieved through inductive charging.

[0104] The frame 19 is the structural element of the electric bicycle 1 , housing the internal battery 9, which is connected to the electric motor 7 mounted within the frame 19. The motor 7 serves to drive the wheels by converting electrical energy from the internal battery 9 into mechanical motion. The illustrated system offers several methods for energy management. For example, the battery of the range extender 3 can be charged via a cable 29, while simultaneously or at a later time, the internal battery 9 of the electric bicycle 1 is charged through inductive coupling between the range extender 3 and the holding device 5. Similarly, the internal battery 9 of the electric bicycle 1 can be charged via a cable 29, while the range extender’s 3 battery is charged through inductive coupling.

[0105] Another option is to charge the internal battery 9 of the electric bicycle 1 via inductive coupling with an external charging device 13, with the possibility of also charging the range extender’s 3 battery through coupling with the internal battery 9.

[0106] Additionally, a smartphone can be inductively coupled with the range extender 3 or the holding device 5, or connected via a cable 29 to the range extender 3, the holding device 5, or an additional interface of the electric bicycle 1 . In these cases, the range extender’s 3 battery and / or the internal battery 9 of the electric bicycle 1 serve as power sources.

[0107] It is also possible that the internal battery transfers 9 energy to the range extender 3, which can then be used to charge another bicycles battery, allowing for energy sharing between bicycles.

[0108] Fig. 2 illustrates a schematic overview of a further preferred embodiment of the energy management system 21 for an electric bicycle 1 , encompassing both the electric bicycle 1 and a charging device 13. This embodiment largely corresponds to the one shown in Fig. 1 , and as such, reference is made to the descriptions of the earlier figure.

[0109] However, Fig. 2 introduces an additional feature: a wireless communication link between the range extender's 3 control unit 15 and the bicycle control unit 11. This enhancement not only allows for energy transfer but also enables communication and control between the two units 11 , 15, providing greater flexibility in managing energy resources and ensuring more efficient coordination of the bicycle's various components. Both the bicycle control unit 11 and the range extender control unit 15 are equipped with communication units that include transmitters and receivers, making them suitable for wireless communication. Communication between these units can be established using a variety of technologies. For example, Bluetooth may be used for short-range, low-power communication, allowing efficient real-time data transfer between the control units without significant battery drain. Wi-Fi can also be used for wider coverage and higher data transfer rates, especially in scenarios that require larger data transfers, such as system diagnostics or updates. Alternatively, Zigbee or NFC can be used.

[0110] Fig. 3 shows a preferred embodiment of a range extender 3 and a holding device 5 for coupling the range extender 3 with an electric bicycle 1 .

[0111] The range extender 3 comprises a housing 25, which is cylindrical and shaped like a bottle. The housing 25 houses a rechargeable battery and a control unit 15. The control unit 15 includes a communication unit capable of wireless data communication with the bicycle control unit 11. Additionally, the range extender 3 comprises an interface for charging the battery and / or supplying power to a load, which may be a smartphone, the internal battery 9 of the electric bicycle 1 , or the electric motor 7 of the electric bicycle 1 . This interface comprises an inductive coil 24 positioned at the lower part of the cylindrical housing 25.

[0112] The holding device 5 has a receiving element designed to hold the range extender 3 in place. This receiving element comprises a clamping element 35 that exerts a clamping force on the outer surface of the housing 25 of the range extender 3 and a base element 37 that contacts the bottom of the housing 25 to limit axial displacement when the range extender 3 is held by the receiving element. A rigid bar 39 connects the clamping element 35 and base element 37, and the bar 39 is equipped with fastening mechanisms 33 to securely attach the holding device 5 to the frame 19 of the electric bicycle 1 . Furthermore, the base element 37 contains an inductive coil 23, allowing the range extender’s 3 battery 27 to wirelessly connect to the internal battery 9 or electric motor 7 of the bicycle 1 for power transfer. Fig. 4 shows a section of a preferred embodiment of an electric bicycle 1 . Specifically, the frame 19 of the bicycle 1 is visible, to which a holding device 5 is attached via fastening means 33.

[0113] The holding device 5 is designed to hold a range extender 3 and connect it to the electric bicycle 1. The holding device 5 comprises a clamping element 35 and a base element 37, which are connected by a rigid bar 39. An inductive coil 23 is installed in the base element 37, which can serve as an interface for energy transfer. The fastening means 33, used to secure the holding device 5 to the frame 19, can be designed as screws, clamping rings, or similar mechanisms.

[0114] The clamping element 35 is designed to securely grip the range extender 3 while allowing easy insertion and removal. This element 35 is preferably made of flexible or spring-loaded materials, such as plastic or metal, to adapt to different range extender size or bottle sizes and shapes. The clamping element 35 features two curved arms or grips that hold the range extender 3 in place by exerting gentle pressure, preventing it from slipping during movement or vibrations.

[0115] Some designs may also include rubber or silicone pads inside the clamp element 35 to improve friction and stability, ensuring a firm yet non-damaging hold on the bottle.

[0116] It is apparent that with such a holding device 5, regular bottles containing liquids can also be transported, allowing a user to carry them when not using a range extender 3 while riding an electric bicycle 1 .

[0117] Fig. 5 shows a cross-sectional view of a preferred embodiment of a battery 9 for an electric bicycle 1 . The battery 9 comprises a battery housing 40, sealing components arranged within the battery 9 from environmental conditions. The battery 9 further comprises a guiding 42 attached to an outer surface of the housing 40. The guiding 42 is in the form of a guiderail and can be manufactured from a plastic material.

[0118] A magnetic element 60 in the form of a disc-shaped magnet is arranged between part of the guiding 42 and the housing 40. The magnetic element 60 is able to move along an extension direction of the guiding 42 along the x-direction. The movement of the magnetic element 60 is restricted in the y-direction and the z-direction.

[0119] The battery 9 further comprises a printed circuit board 52 arranged within the housing 40 and in proximity to a wall of the housing 40. A sensing element 50 is provided on the printed circuit board 52 and is connected to conductive traces 54 of the printed circuit board 52. The sensing element 50 is positioned below at least part of the guiding 42, when viewed along the z-direction. The sensing element 50 is arranged in proximity to a wall of the housing 40.

[0120] Fig. 6 shows a top view of a preferred embodiment of a battery 9 for an electric bicycle 1 . The guiding 42 includes two separate guiderails with a z-shaped cross section which are arranged parallel to each other. The magnetic element 60 is arranged between these two parts of the guiding 42. A gap between these two parts of the guiding 42 allows a user to touch the magnetic element 60 and to move it along the x-direction between a first position near a first end of the guiding 42 and a second position near a second end of the guiding 42 opposite to the first end.

[0121] A detention element 44 in the form of a steel plate is arranged at both ends of the guiding 42. The detention elements 44 define the endpoints of the possible movement of the magnetic element 60 along the x-direction. The detention elements 44 further hold the magnetic element 60 at either the first position or the second position using the magnetic force between the magnetic element 60 and the detention elements 44.

[0122] Fig. 7 shows a top view of a further preferred embodiment of a battery 9 for an electric bicycle 1. The battery 9 comprises a display 70 which is integrated into a housing 40 of the battery 9. The display 70 is an E-ink display. A switch area 80 is defined as an area on an outer surface of the housing 40. A battery management system of the battery 9 can be activated if a magnetic element 60 or a ferromagnetic element 65 are brought into proximity of the housing 40 in the switch area 80. Upon activation of the BMS the information shown on the display can be updated.

[0123] Fig. 8 shows a cross-sectional view of a further preferred embodiment of a battery 9 for an electric bicycle 1. The battery 9 comprises a battery housing 40, sealing components arranged within the battery 9 from environmental conditions. The battery 9 further comprises a flap 46 attached to an outer surface of the housing 40. The flap 46 is pivotably attached to the housing 40 using a hinge 48.

[0124] A ferromagnetic element 65 in the form of a steel-insert is arranged within the flap 46. The ferromagnetic element 65 is able to be pivoted together with the flap 46 between a first position (shown in dotted lines) and a second position.

[0125] The battery 9 further comprises a printed circuit board 52 arranged within the housing 40 and in proximity to a wall of the housing 40. A sensing element 50 is provided on the printed circuit board 52 and is connected to conductive traces 54 of the printed circuit board 52. The sensing element 50 is positioned below at least part of the hinge 46 when being in the first position, when viewed along the z-direction. The sensing element 50 is arranged in proximity to a wall of the housing 40. A magnetic element 60 is arranged at the printed circuit board 52 and at least partially below the sensing element 50. If the hinge 46 is pivoted to the first position, the ferromagnetic element 65 causes a change of the magnetic field of the magnetic element 60 detected by the sensing element 50.

[0126] Fig. 9 shows a flow-diagram of a computer-implemented method for activating an energy storage management system of an energy storage 9 for a powered device 1 . The method comprises the step of detecting 101 if a magnetic element 60 is moved to or in proximity to a first position by detecting a magnetic field with a sensing element 50. The magnetic element 60 can be a magnet which is movably attached to a housing 40 of the energy storage 9 or can be any other magnetic element such as a magnet which is not attached to the energy storage 9. The first position is an area at an outer surface of the housing 40.

[0127] The method further comprises activating 102 the energy storage management system in response to detecting the magnetic field of the magnetic element 60. The battery management system can be woken up from an energy-saving mode such as a sleep mode or idle mode. The step of activating 102 comprises the step of triggering 103 the determination of a state of charge of the energy storage 9 by the energy storage management system. The state of charge can be determined using internal sensors of the energy storage to determine a voltage of at least one energy storage unit of the energy storage 9. The step of activating 102 can comprise activating only certain functions or certain components of the energy storage management system.

[0128] The step of activating 102 further comprises the step of outputting 104 the state of charge by the energy storage management system. The energy storage management system outputs the state of charge by providing the state of charge to a display 70 of the energy storage 9 for displaying information relating to the state of charge or by providing the state of charge to a wireless communicator of the energy storage 9 for sending electromagnetic signals relating to the state of charge, for example to an external device.

[0129] Fig. 10 shows a flow-diagram of a further computer-implemented method for activating an energy storage management system of an energy storage 9 for a powered device 1 . The method comprises the step of detecting 201 if a ferromagnetic element 65 is moved to or in proximity to a first position by detecting a change of a magnetic field with a sensing element 50. The ferromagnetic element 65 can be a steel element which is movably attached to a housing 40 of the energy storage 9 or can be any other steel element or element made from a ferromagnetic material such as a steel key which is not attached to the energy storage 9. The first position is an area at an outer surface of the housing 40.

[0130] The method further comprises activating 202 the energy storage management system in response to detecting the change of the magnetic field. The battery management system can be woken up from an energy-saving mode such as a sleep mode or idle mode.

[0131] The step of activating 202 comprises the step of triggering 203 the determination of a state of charge of the energy storage 9 by the energy storage management system. The state of charge can be determined using internal sensors of the energy storage to determine a voltage of at least one energy storage unit of the energy storage 9. The step of activating 202 can comprise activating only certain functions or certain components of the energy storage management system.

[0132] The step of activating 202 further comprises the step of outputting 204 the state of charge by the energy storage management system. The energy storage management system outputs the state of charge by providing the state of charge to a display 70 of the energy storage 9 for displaying information relating to the state of charge or by providing the state of charge to a wireless communicator of the energy storage 9 for sending electromagnetic signals relating to the state of charge, for example to an external device.

[0133] Fig. 11 shows a flow-diagram of a further computer-implemented method for activating an energy storage management system of an energy storage 9 for a powered device 1 . The method comprises the step of detecting 301 , using a sensing element 50, if an electromagnetic signal is emitted by an external device. The step of detecting 301 therefore comprises determining if an electromagnetic signal emitted from an external device is received with the sensing unit. The external device can be a smartphone, a wearable device, a tablet computer or the like. The sensing unit can be a wireless communicator and can comprise an antenna for receiving electromagnetic signals. The sensing unit can be capable of receiving and / or sending signals according to wireless communication protocols such as Bluetooth, NFC and / or RFID.

[0134] The method further comprises activating 302 the energy storage management system in response to detecting the electromagnetic signal. The energy storage management system can be woken up from an energy-saving mode such as a sleep mode or idle mode.

[0135] The step of activating 302 comprises the step of triggering 303 the determination of a state of charge of the energy storage 9 by the energy storage management system. The state of charge can be determined using internal sensors of the energy storage to determine a voltage of at least one energy storage unit of the energy storage 9. The step of activating 302 can comprise activating only certain functions or certain components of the energy storage management system. The step of activating 302 further comprises the step of outputting 304 the state of charge by the energy storage management system. The energy storage management system outputs the state of charge by providing the state of charge to a display 70 of the energy storage 9 for displaying information relating to the state of charge or by providing the state of charge to a wireless communicator of the energy storage 9, for example the sensing unit, for sending electromagnetic signals relating to the state of charge, for example to an external device.

[0136] Fig. 12 shows a flow-diagram of a computer-implemented method for displaying a state of charge of an energy storage 9 for a powered device 1 . The method comprises the step of determining 401 by an energy storage management system of the energy storage 9 the state of charge of at least one energy storage unit of the energy storage 9. The state of charge can be determined using internal sensors of the energy storage to determine a voltage of at least one energy storage unit of the energy storage 9. The step of determining the state of charge can also comprise obtaining the state of charge from a memory.

[0137] The method further comprises the step of outputting 402 a signal corresponding to the state of charge to a display unit 70 of the energy storage 9. The display unit 70 can display information relating to the state of charge based on the signal. The display unit 70 is an E-ink display integrated into a housing 40 of the energy storage 9 such that the display unit 70 is visible from an outside of the housing 40.

[0138] The method further comprises the step of displaying 403, using the display unit 70, at least the state of charge such that a user can read the state of charge from the display unit 70.

[0139] The method further comprises the step of stopping 404 the supply of power to the display unit 70. The energy storage management system can stop the supply of power to the display unit 70 after the display unit 70 changed the displayed values based on the signal relating to the state of charge to save energy.

[0140] The method further comprises the step of maintaining 405 displaying, using the display unit 70, at least the state of charge without continuous supply of power. The E-ink display can maintain the displayed information even without continuous supply of electric power.

[0141] Fig. 13 shows a flow-diagram of a computer-implemented method for providing information relating to a state of charge of an energy storage 9 for a powered device 1. The method comprises the step of receiving 505 or detecting, by a wireless communicator of the energy storage 9, an electromagnetic signal from an external device. The external device can be a smartphone, a wearable device, a tablet computer or the like. The signal can be, for example, a Bluetooth, NFC or RFID signal. The wireless communicator can comprise an antenna for sending and / or receiving electromagnetic signals. The wireless communicator can be capable of receiving and / or sending signals according to wireless communication protocols such as Bluetooth, NFC and / or RFID.

[0142] The method further comprises the step of waking 504 the energy storage management system in response to receiving the electromagnetic signal from the external device. The energy storage management system can be woken up from an energy-saving mode such as a sleep mode or idle mode. The step of waking 504 can comprise activating only certain functions or certain components of the energy storage management system.

[0143] The method further comprises the step of determining 501 by an energy storage management system of the energy storage 9 the state of charge of at least one energy storage unit of the energy storage 9. The state of charge can be determined using internal sensors of the energy storage to determine a voltage of at least one energy storage unit of the energy storage 9. The step of determining the state of charge can also comprise obtaining the state of charge from a memory. The step of determining 501 , by the energy storage management system, the state of charge is executed in response to receiving 505 the signal from the external device and waking 504 the energy storage management system.

[0144] The method further comprises the step of outputting 502 a signal corresponding to the state of charge to the wireless communicator of the energy storage 9 or to a further wireless communicator of the energy storage 9. The further wireless communicator can comprise an antenna for sending and / or receiving electromagnetic signals. The further wireless communicator can be capable of receiving and / or sending signals according to wireless communication protocols such as Bluetooth, NFC and / or RFID.

[0145] The method further comprises the step of sending 503, using the wireless communicator, an electromagnetic signal relating to the state of charge to an external device.

[0146] The above embodiments in the application can also be described using the following Itemized list.

[0147] 1 . A range extender for an electric bicycle, comprising

[0148] - a housing, and

[0149] - a rechargeable battery, and

[0150] - a control unit, preferably with a communication unit capable of being in data communication with an electric bicycle’s control unit, and

[0151] - an interface for coupling the battery to a charging device for charging the battery and for coupling the battery to a load for supplying power to the load.

[0152] 2. The range extender according to item 1 , wherein the interface for charging the battery and / or supplying power to a load comprises an inductive coil.

[0153] 3. The range extender according to item 1 or item 2, wherein the interface for charging the battery and / or supplying power to a load comprises a female or male part of a plug connection for wire-based energy transfer.

[0154] 4. The range extender according to any of the preceding items, wherein the communication unit is capable of wireless communication and includes a transmitter and a receiver.

[0155] 5. The range extender according to any of the preceding items, wherein the communication unit is capable of wired communication, and the range extender comprises a female or male part of a plug connection for wirebased data transfer.

[0156] 6. The range extender according to any of the preceding items, wherein the housing is cylindrical and / or comprises a bottle-shaped design.

[0157] 7. The range extender according to item 6, wherein the interface for charging the battery and / or supplying power to a load, particularly the inductive coil, is positioned in a bottom section of the cylindrical housing.

[0158] 8. The range extender according to any of the preceding items, wherein the load comprises a smartphone, a battery of an electric bicycle or an electric motor of an electric bicycle.

[0159] 9. A holding device for a range extender to couple the range extender with an electric bicycle, comprising:

[0160] - a receiving element for holding the range extender,

[0161] - fastening means for securely attaching the receiving element to a frame of the electric bicycle, and

[0162] - an interface capable of coupling the range extender’s battery to the internal battery and / or electric motor of the electric bicycle.

[0163] 10. The holding device according to item 9, wherein the interface comprises an inductive coil.

[0164] 11 . The holding device according to item 9 - 10, wherein the interface comprises a female or male part of a plug connection for wire-based energy and / or data transfer.

[0165] 12. The holding device according to any of the preceding items 9 - 11 , wherein the receiving element comprises a clamping element and a base element coupled to the clamping element, - wherein the clamping element is configured to exert a clamping force on an outer surface of a housing of the range extender, and

[0166] - wherein the base element is arranged to contact a bottom of the housing of the range extender, in order to limit axial displacement, when a range extender is held by the receiving element. The holding device according to any of the preceding items 9 - 12, wherein the clamping element and the base element are coupled by a rigid bar, the bar comprising fastening means for attaching the holding device to a frame of an electric bicycle. A kit comprising a range extender according to any of the preceding items 1 - 8 and a holding device according to any of the preceding items 9 - 13. An electric bicycle, comprising:

[0167] - an electric motor, and

[0168] - an internal battery for supplying the electric motor with power, and

[0169] - a bicycle control unit, and

[0170] - a range extender according to any of the preceding items 1 - 8, coupled to a holding device according to any of the preceding items 9 - 13, wherein the holding device is attached to a frame of the electric bicycle via fastening means, and the interface of the holding device being coupled to the bicycle control unit, the internal battery and / or the electric motor. The electric bicycle according to item 15, wherein the range extender is configured to supply power to the internal battery and / or the electric motor via the holding device, either through an inductive coupling of the range extender and the holding device, or through a plug connection. The electric bicycle according to item 15 or 16, wherein the range extender is configured to receive power from the internal battery via the holding device, either through an inductive coupling of the range extender and the holding device, or through a plug connection.

[0171] 18. The electric bicycle according to any of the preceding items 15 - 17, wherein the bicycle control unit comprises a transmitter and a receiver and is in wireless data communication with the range extender’s control unit.

[0172] 19. The electric bicycle according to any of the preceding items 15 - 18, wherein the bicycle control unit is configured to manage energy distribution and operation, including interactions between the internal battery, the electric motor, and the range extender.

[0173] 20. The electric bicycle according to any of the preceding items 15 - 19, further comprising an additional interface for directly coupling the internal battery to a charging device or an external device, such as a smartphone.

[0174] 21. The electric bicycle according to item 20, wherein the additional interface comprises an inductive coil.

[0175] 22. The electric bicycle according to any of the preceding items 20 - 21 , wherein the additional interface comprises a female or male part of a plug connection for wire-based energy transfer.

[0176] 23. An energy management system comprising the electric bicycle according to any of the preceding items 15 - 22 and a charging device, wherein the charging device is configured to supply power to the range extender and / or the internal battery, and is capable of being coupled to the internal battery and / or the range extender via a wired or wireless connection.

[0177] 24. A method for charging the electric bicycle according to any of the preceding items 15 - 22, comprising the following steps:

[0178] - charging the battery of the range extender via a cable, simultaneous or time-shifted charging of the internal battery of the electric bicycle by inductive coupling of the range extender and the holding device.

[0179] 25. A method for charging the electric bicycle according to any of the preceding items 15 - 22, comprising the following steps:

[0180] - charging of the internal battery of the electric bicycle via a cable,

[0181] - simultaneous or time-shifted charging of the battery of the range extender by inductive coupling of the range extender and the holding device.

[0182] 26. A method for charging the electric bicycle according to any of the preceding items 15 - 22:

[0183] - charging of the internal battery of the electric bicycle via inductive coupling with a charging device,

[0184] - optionally charging the range extender’s battery via inductive coupling between the holding device and the range extender, the internal battery serving as a power source for charging the range extender.

[0185] 27. A method for charging a smartphone via the electric bicycle according to any of the preceding items 15 - 22, comprising the following steps:

[0186] - inductive coupling of the smartphone with the range extender or the holding device, or

[0187] - connecting the smartphone with the range extender, the holding device or an additional interface of the electric bicycle via a cable, wherein the range extender’s battery and / or the internal battery of the electric bicycle serve as a power source.

[0188] The second itemized list refers to the aspect relating to a battery for an electric bicycle and a method for activating a battery management system of a battery for an electric bicycle. The items of the second itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims. Second itemized list:

[0189] 1. A battery for an electric bicycle, the battery comprising: a housing; at least one battery cell arranged within the housing; a battery management system arranged within the housing; a magnet movably attached to an outside surface of the housing using a guide rail; and a sensing element arranged within the housing and configured to detect a magnetic field of the magnet and to activate the battery management system in response to the detection of the magnetic field.

[0190] 2. A computer-implemented method for activating a battery management system of a battery for an electric bicycle, the method comprising the steps: detecting if a magnet is moved from a second position to a first position by detecting a magnetic field with a sensing element; and activating the battery management system in response to detecting the magnetic field.

[0191] 3. An energy storage for a powered device, the energy storage comprising: a housing; at least one energy storage unit arranged within the housing; an energy storage management system arranged within the housing; and a sensing element arranged within the housing and configured to detect a magnetic field and to activate the energy management system in response to the detection of the magnetic field.

[0192] 4. The energy storage of item 3, wherein the at least one energy storage unit is one of a battery cell or a capacitor.

[0193] 5. The energy storage of items 3 or 4, wherein the sensing element comprises at least one of a reed relay, a hall sensor, or an inductive coil. 6. The energy storage of item 3 or 4, wherein the sensing element comprises an inductive coil configured to generate a voltage spike for triggering a field-effect transistor in response to detecting a magnetic field.

[0194] 7. The energy storage of one of items 3 to 6, wherein the sensing element is arranged in proximity to a wall of the housing.

[0195] 8. The energy storage of one of items 3 to 7, further comprising a magnetic element, wherein the sensing element is configured to detect the magnetic field of the magnetic element.

[0196] 9. The energy storage of item 8, wherein the magnetic element is a magnet.

[0197] 10. The energy storage of item 9, wherein the magnetic element is arranged outside of the housing.

[0198] 11. The energy storage of item 10, wherein the magnetic element is movably attached to an outside surface of the housing.

[0199] 12. The energy storage of item 11 , wherein the magnetic element is movably between at least a first position and a second position.

[0200] 13. The energy storage of items 11 or 12, wherein the magnetic element is movably arranged within a guiding.

[0201] 14. The energy storage of item 13, wherein the guiding allows the magnetic element to move in one spatial direction and restricts a movement of the magnetic element in the two other spatial directions.

[0202] 15. The energy storage of one of items 13 or 14, wherein the guiding comprises at least one of a guide rail or a hinge.

[0203] 16. The energy storage of one of items 12 to 15, wherein the sensing element is configured to detect the magnetic field of the magnetic element when the magnetic element is in the first position and the sensing element is configured to not detect the magnetic field of the magnetic element when the magnetic element is in the second position.

[0204] 17. The energy storage of item 16, wherein the sensing element is configured to activate the energy management system when the magnetic element is in the first position.

[0205] 18. The energy storage of one of items 13 to 17, wherein the guiding comprises at least one detention element for holding the magnetic element in at least one of the first position and the second position.

[0206] 19. The energy storage of item 18, wherein the at least one detention element comprises at least one of a ferromagnetic material, a recess or a projection.

[0207] 20. The energy storage of one of items 3 to 19, wherein the housing is a sealed housing, sealing an inside of the housing from an outside of the housing.

[0208] 21. The energy storage of one of items 3 to 20, wherein a wall of the housing is free of any apertures in the area between the magnetic element and the sensing element.

[0209] 22. A computer-implemented method for activating an energy storage management system of an energy storage for a powered device, the method comprising the steps: detecting if a magnetic element is moved to a first position by detecting a magnetic field with a sensing element; and activating the energy storage management system in response to detecting the magnetic field.

[0210] 23. The computer-implemented method of item 22, wherein the step of detecting the magnetic field comprises detecting if the strength of the magnetic field exceeds a predetermined value. 24. The computer-implemented method of items 22 and 23, wherein the step of activating the energy storage management system comprises triggering the determination of a state of charge of the energy storage.

[0211] 25. The computer-implemented method of item 24, wherein the step of activating the energy storage management system further comprises outputting the state of charge.

[0212] 26. The computer-implemented method of item 25, wherein the step of outputting the state of charge comprises at least one of providing the state of charge to a display or providing the state of charge to a wireless communicator.

[0213] 27. A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method of any one of items 2 and 22 to 26.

[0214] 28. A computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the method of any one of items 2 and 22 to 26.

[0215] 29. A data processing apparatus, comprising means for carrying out the method of items 2 and 22 to 26.

[0216] The items of the second itemized list relate to a battery system for electrically powered vehicles, in particular for electric bicycles (e-bikes), and more specifically to a switching mechanism for activating a battery management system (BMS) that avoids mechanical complexity and improves environmental sealing of the battery housing. The solution provides a magnetic switch configured to activate the BMS from outside a sealed battery housing, thereby eliminating the need for physical apertures or traditional mechanical or optical switches.

[0217] Conventional BMS activation mechanisms typically rely on optical sensors or physical buttons, which introduce reliability issues and sealing challenges. Optical switches, while allowing non-contact activation, are susceptible to accidental triggering due to ambient light interference and require complex calibration. Mechanical switches necessitate penetrations in the battery housing, compromising the device’s environmental protection and increasing the risk of failure in rugged or moisture-prone environments.

[0218] To overcome these drawbacks, the solution introduces a magnetic switch system wherein a magnet outside of the battery housing interacts with a sensing element located on a printed circuit board (PCB) within the sealed housing. The magnet can be mounted externally to the housing. The sensing element may be selected from various low-power magnetic detection components, including reed relays for mechanical simplicity, Hall sensors for high-resolution magnetic field detection, or inductive coils configured to generate a voltage spike used to trigger a field-effect transistor (FET), thereby activating the BMS without continuous current draw.

[0219] The magnet may be arranged in a user-operable mechanical configuration such as a sliding, foldable, or rotatable assembly mounted on or integrated into the outer surface of the battery housing. In one embodiment, the magnet is positioned within a guide rail formed from plastic, the guide rail comprising mechanical detents or bumps that define and stabilize discrete ON and OFF positions. To further improve positional stability and prevent unintended activation due to vibration or impact, one or more steel end plates or magnetic end elements may be provided at the longitudinal ends of the guide rail, attracting the magnet magnetically and thereby anchoring it in the ON or OFF position.

[0220] The internal sensing element is arranged in proximity to the inner surface of the battery housing, typically near the PCB, such that it can detect the magnetic field through the wall of the housing without requiring any physical opening. This configuration allows the BMS to be selectively activated or deactivated via external magnetic manipulation, without compromising the integrity of the housing.

[0221] An advantage of the disclosed system lies in its elimination of any mechanical penetration through the battery housing, thereby enhancing moisture and dust resistance and enabling use in harsh or outdoor environments. The absence of mechanical contact also simplifies manufacturing, reduces the number of wear-prone components, and contributes to improved system durability. Furthermore, the solution supports the use of nano-power sensors and passive triggering circuits, ensuring minimal energy consumption during standby and activation phases. This enables the battery to maintain a long shelf-life and remain operationally efficient over extended periods without compromising responsiveness or requiring frequent maintenance.

[0222] The magnetic activation mechanism is particularly well-suited for applications in which robustness, reliability, and energy efficiency are paramount. These include, but are not limited to, electric bicycles, outdoor mobility systems, and battery-powered equipment used in marine, industrial, or remote environments. The modular and adaptable design of the external magnet configuration further allows customization to suit varying mechanical, ergonomic, or environmental requirements.

[0223] The third itemized list refers to the aspect relating to a battery for an electric bicycle and a method for activating a battery management system of a battery for an electric bicycle. The items of the third itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims.

[0224] Third itemized list:

[0225] 1. A battery for an electric bicycle, the battery comprising: a housing; at least one battery cell arranged within the housing; a battery management system arranged within the housing; a sensing element arranged within the housing; and a magnet arranged within the housing and adjacent to the sensing element; wherein the sensing element is configured to detect a change of a magnetic field of the magnet and to activate the battery management system in response to the detection of the change of the magnetic field.

[0226] 2. A computer-implemented method for activating a battery management system of a battery for an electric bicycle, the method comprising the steps: detecting if a ferromagnetic element is moved in proximity to a first position on the outside of a housing of the battery by detecting a change of a magnetic field; and activating the battery management system in response to detecting the change of the magnetic field. An energy storage for a powered device, the energy storage comprising: a housing; at least one energy storage unit arranged within the housing; an energy storage management system arranged within the housing; a sensing element arranged within the housing; and a magnetic element arranged within the housing and adjacent to the sensing element; wherein the sensing element is configured to detect the change of a magnetic field of the magnetic element and to activate the energy management system in response to the detection of the change of the magnetic field. The energy storage of item 3, wherein the at least one energy storage unit is one of a battery cell or a capacitor. The energy storage of items 3 or 4, wherein the sensing element comprises at least one of a reed relay, a hall sensor, or an inductive coil. The energy storage of item 3 or 4, wherein the sensing element comprises an inductive coil configured to generate a voltage spike for triggering a field-effect transistor in response to detecting a change of the magnetic field. The energy storage of one of items 3 to 6, wherein the sensing element and the magnetic element are arranged in proximity to a wall of the housing. The energy storage of one of items 3 to 7, further comprising a magnetic element, wherein the sensing element is configured to detect the magnetic field of the magnetic element. The energy storage of item 8, wherein the magnetic element is a magnet. The energy storage of item 9, wherein the sensing element is arranged on a printed circuit board of and the magnetic element is arranged at least partially on top of the sensing element. The energy storage of one of items 3 to 10, wherein the sensing element is configured to detect a change of the magnetic field of the magnetic element in a case in which a ferromagnetic element is moved into proximity of the magnetic element. The energy storage of item 11 , wherein the sensing element is configured to activate the energy management system when the ferromagnetic element is moved into proximity of the magnetic element. The energy storage of one of items 3 to 12, wherein the housing is a sealed housing, sealing an inside of the housing from an outside of the housing. The energy storage of one of items 3 to 13, wherein a wall of the housing is free of any apertures in the area close to the magnetic element and the sensing element. A computer-implemented method for activating an energy storage management system of an energy storage for a powered device, the method comprising the steps: detecting if a ferromagnetic element is moved in proximity to a first position on the outside of a housing of the energy storage by detecting a change of a magnetic field with a sensing element; and activating the energy storage management system in response to detecting the change of the magnetic field. The computer-implemented method of item 15, wherein the step of detecting the change of the magnetic field comprises detecting if the amount of change of the strength of the detected magnetic field exceeds a predetermined value. 17. The computer-implemented method of items 15 and 16, wherein the step of activating the energy storage management system comprises triggering the determination of a state of charge of the energy storage.

[0227] 18. The computer-implemented method of item 17, wherein the step of activating the energy storage management system further comprises outputting the state of charge.

[0228] 19. The computer-implemented method of item 18, wherein the step of outputting the state of charge comprises at least one of providing the state of charge to a display or providing the state of charge to a wireless communicator.

[0229] 20.A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method of any one of items 2 and 15 to 19.

[0230] 21. A computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the method of any one of items 2 and 15 to 19.

[0231] 22. A data processing apparatus, comprising means for carrying out the method of items 2 and 15 to 19.

[0232] The items of the third itemized list relate to a battery system for electric vehicles, in particular for electric bicycles (e-bikes), and more specifically to an externally activatable system for a battery management system (BMS) that enables activation without mechanical interaction or openings in the battery housing. The invention addresses the problem of providing a simple and robust means of activating the BMS when the battery is not connected to the electric bicycle, particularly in situations where conventional mechanical or optical switches are impractical due to sealing, reliability, or complexity concerns. The solution provides a contactless activation mechanism in which the BMS is switched on by bringing a metallic or magnetic object, such as a steel key, magnetic knob, or hinged magnetic actuator, into proximity with a sensing element that is positioned inside the sealed battery housing. The sensing element is located near or on a printed circuit board (PCB) and a magnetic element is arranged adjacent to the sensing element. The sensing element is configured to respond to a change of the sensed magnetic field or inductive influence generated by the external object. In this way, the internal electronics detect the presence or movement of the external element and initiate activation of the BMS accordingly.

[0233] This configuration allows the battery housing to remain completely sealed, thereby avoiding any physical apertures, buttons, or electrical connectors that could compromise ingress protection or mechanical durability. The sensing element may be implemented using low-power technologies such as Hall sensors, reed relays, or other magnetic or field-sensitive components suitable for low-energy applications.

[0234] Unlike prior solutions that require direct interaction with a switch element or a fixed mounting for a movable actuator, the invention allows for free positioning or temporary placement of the external element near the sensing zone. This simplifies handling and reduces mechanical complexity, while still offering reliable and repeatable activation of the BMS. The system may be designed so that the external element is held near a predefined activation region, but no guide rail or physical alignment mechanism is necessary, thus allowing for a minimal and cost-effective implementation.

[0235] An advantage of the disclosed solution is that it reduces assembly and maintenance complexity, while also improving environmental resistance of the battery. By eliminating the need for external switches, connectors, or buttons, the risk of dust ingress, water leakage, corrosion, or mechanical failure is greatly reduced. This makes the system particularly suitable for rugged applications, including outdoor use, marine environments, and other scenarios where long-term durability and ease of use are critical.

[0236] In addition, the system supports the use of nano-power sensing elements or passive triggering schemes, thereby ensuring that the battery remains energy-efficient during idle states and does not consume significant standby power. This is especially advantageous for e-bike batteries that may be stored for extended periods between uses or must remain in standby condition for occasional checks or remote diagnostics.

[0237] Overall, the solution provides a reliable, cost-efficient, and user-friendly means of externally activating a sealed battery system without requiring complex mechanical assemblies or electrical interfaces. It is particularly applicable to use cases where compactness, robustness, and minimal user interaction are required, such as in consumer e-mobility products, fleet battery systems, and battery-operated devices used in harsh or inaccessible environments.

[0238] The Fourth itemized list refers to the aspect relating to a battery for an electric bicycle and a method for activating a battery management system of a battery for an electric bicycle. The items of the fourth itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims.

[0239] Fourth itemized list:

[0240] 1. A battery for an electric bicycle, the battery comprising: a housing; at least one battery cell arranged within the housing; a battery management system arranged within the housing; and a wireless communicator arranged within the housing and configured to detect an electromagnetic signal emitted by an external device and to activate the battery management system in response to the detection of the electromagnetic signal.

[0241] 2. A computer-implemented method for activating a battery management system of a battery for an electric bicycle, the method comprising the steps: detecting with a wireless communicator if an electromagnetic signal is emitted by an external device; and activating the battery management system in response to detecting the electromagnetic signal. 3. An energy storage for a powered device, the energy storage comprising: a housing; at least one energy storage unit arranged within the housing; an energy storage management system arranged within the housing; and a sensing unit arranged within the housing and configured to detect an electromagnetic signal emitted by an external device and to activate the energy storage management system in response to the detection of the electromagnetic signal.

[0242] 4. The energy storage of item 3, wherein the at least one energy storage unit is one of a battery cell or a capacitor.

[0243] 5. The energy storage of items 3 or 4, wherein the sensing unit comprises a wireless communicator.

[0244] 6. The energy storage of item 5, wherein the wireless communicator comprises an antenna or a coil.

[0245] 7. The energy storage of one of items 3 to 6, wherein the sensing unit is arranged in proximity to a wall of the housing.

[0246] 8. The energy storage of one of items 3 to 7, wherein the sensing unit comprises one of an RFID coil or an NFC coil.

[0247] 9. The energy storage of one of items 3 to 7, wherein the sensing unit comprises a Bluetooth communicator.

[0248] 10. The energy storage of one of items 3 to 7, wherein the electromagnetic signal is based on one of RFID-, NFC- or Bluetooth-communication.

[0249] 11. The energy storage of one of items 3 to 10, wherein the external device is one of a smartphone, a wearable electronic device, or a tablet computer. The energy storage of one of items 3 to 11 , wherein the housing is a sealed housing, sealing an inside of the housing from an outside of the housing. The energy storage of one of items 3 to 12, wherein a wall of the housing is free of any apertures in the area in proximity to the sensing unit. A computer-implemented method for activating an energy storage management system of an energy storage for a powered device, the method comprising the steps: detecting with a sensing unit if an electromagnetic signal is emitted by an external device; and activating the energy storage management system in response to detecting the electromagnetic signal. The computer-implemented method of item 14, wherein the step of activating the energy storage management system comprises triggering the determination of a state of charge of the energy storage. The computer-implemented method of item 15, wherein the step of activating the energy storage management system further comprises outputting the state of charge. The computer-implemented method of item 16, wherein the step of outputting the state of charge comprises at least one of providing the state of charge to a display or providing the state of charge to one of the wireless communicator or a further wireless communicator. A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method of any one of items 2 and 14 to 17. A computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the method of any one of items 2 and 14 to 17 20. A data processing apparatus, comprising means for carrying out the method of items 2 and 14 to 17.

[0250] The items of the fourth itemized list relate to battery systems for electric vehicles, in particular for electric bicycles (e-bikes), and more specifically to a wireless activation mechanism for a battery management system (BMS) that enables the BMS to be activated when the battery is not installed in the e-bike. The invention addresses the technical problem that, in conventional battery systems, the BMS can only be activated via the electrical interface of the e-bike itself, making it impossible to check the state of charge (SOC) or access diagnostic information when the battery is removed from the vehicle. This limitation poses usability and maintenance challenges, particularly in scenarios involving storage, transport, pre-use checks, or fleet management operations.

[0251] To overcome this limitation, the solution provides a wireless BMS activation solution that responds to electromagnetic signals emitted by external devices, in particular consumer electronic devices such as smartphones. The invention includes a sensing unit arranged inside the sealed battery housing, which is configured to detect electromagnetic signals transmitted from an external device and, upon detection, trigger the activation of the BMS. The sensing unit may be configured to respond to a variety of wireless protocols or emissions, including near-field communication (NFC), radio-frequency identification (RFID), or Bluetooth signals.

[0252] In one embodiment, the sensing unit is configured to detect RFID or NFC signals emitted by a smartphone placed in close proximity to the battery housing. Upon receiving such a signal, the sensing unit powers on the BMS, which can then carry out further operations such as displaying the SOC or preparing for data communication such as providing information regarding the SOC to the external device. In another embodiment, the sensing unit is designed to detect radio frequency emissions used during Bluetooth pairing or data transmission. The RF energy emitted during an attempted wireless connection or data request by the external device can be used to trigger the activation of the BMS. The wireless sensing unit can be implemented using components that support ultralow power standby operation, ensuring that energy consumption remains negligible when the system is idle. This helps to preserve battery life and enable long-term storage of the battery without significant energy loss. The system may also be configured so that the BMS only wakes upon verified signal patterns, avoiding false activations due to ambient RF noise.

[0253] By enabling wireless activation, the invention eliminates the need for mechanical switches, optical sensors, or physical contact with the battery housing. This not only simplifies the external and internal design of the battery but also ensures that the housing remains completely sealed, thereby improving resistance to moisture, dust, and other environmental contaminants. As a result, the system is particularly suitable for rugged or outdoor applications, including bicycles used in wet or dusty conditions or in industrial fleet environments.

[0254] In addition, the ability to activate the BMS via standard smartphone signals offers a user-friendly and technically elegant interface for end users and technicians. No proprietary hardware is required to trigger battery functions such as SOC checks, diagnostics, or readiness for firmware updates. The system is thus highly compatible with modem mobile ecosystems and can be readily integrated into app-based maintenance workflows, offering improved usability and support for connected mobility solutions.

[0255] Overall, the solution provides a technically advantageous solution for non-contact, wireless activation of a battery management system in sealed battery housings. It enhances durability, reduces component complexity, enables smart-device interaction, and supports modern energy efficiency standards — all without compromising the battery’s physical robustness or its compatibility with consumer-grade equipment.

[0256] The fifth itemized list refers to the aspect relating to a battery for an electric bicycle and a method for displaying a state of charge of a battery for an electric bicycle. The items of the fifth itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims. Fifth itemized list:

[0257] 1. A battery for an electric bicycle, the battery comprising: a housing; at least one battery cell arranged within the housing; a battery management system arranged within the housing and configured to determine a state of charge of the at least one battery cell; and an E-ink display integrated into the housing and visible from outside of the housing; wherein the E-ink display is configured to display at least the state of charge and to continuously display at least the state of charge without requiring continuous supply of power.

[0258] 2. A computer-implemented method for displaying a state of charge of a battery for an electric bicycle, the method comprising the steps: determining by a battery management system of the battery the state of charge of at least one battery cell of the battery; outputting a signal corresponding to the state of charge to an E-ink display; displaying, using the E-ink display, at least the state of charge; stopping the supply of power to the E-ink display; maintain displaying, using the E-ink display, at least the state of charge without continuous supply of power.

[0259] 3. An energy storage for a powered device, the energy storage comprising: a housing; at least one energy storage unit arranged within the housing; an energy storage management system arranged within the housing and configured to determine a state of charge of the at least one energy storage unit; and a display unit integrated into the housing and visible from outside of the housing; wherein the display unit is configured to display at least the state of charge and to continuously display at least the state of charge without requiring continuous supply of power.

[0260] 4. The energy storage of item 3, wherein the at least one energy storage unit is one of a battery cell or a capacitor.

[0261] 5. The energy storage of items 3 or 4, wherein the display unit comprises an E- ink display.

[0262] 6. The energy storage of one of items 3 to 5, wherein energy storage management system is configured to send a signal relating to the state of charge to the display unit and the display unit is configured to display the state of charge based on the signal.

[0263] 7. The energy storage of one of items 3 to 6, wherein the display unit is further configured to display a time information.

[0264] 8. The energy storage of item 7, wherein the time information is one of a date or a timestamp.

[0265] 9. The energy storage of item 7 or 8, wherein the time information relates to one of a time at which the energy storage management system has determined the state of charge or a time at which the display unit changed the displayed state of charge to the displayed value.

[0266] 10. The energy storage of one of items 7 to 9, wherein the energy management system is configured to send a time signal relating to a time at which the energy storage management system has determined the state of charge to the display unit and the display unit is configured to display the time information based on the time signal.

[0267] 11. The energy storage of one of items 3 to 10, wherein the energy storage management system is configured to periodically determine the state of charge and to periodically send a signal relating to the state of charge to the display unit.

[0268] 12. The energy storage of item 11 , wherein the energy storage management system periodically wakes itself to periodically determine the state of charge.

[0269] 13. The energy storage of item 11 or 12, wherein the energy storage management system goes into a sleep mode after sending the signal to the display unit.

[0270] 14. The energy storage of one of items 11 to 13, wherein the energy storage management system stops supplying power to the display unit after sending the signal to the display unit.

[0271] 15. The energy storage of one of items 3 to 14, further comprising a wireless communicator, wherein the energy storage management system is configured to determine the state of charge and to send a signal relating to the state of charge to the display unit in response to receiving an electromagnetic signal from an external device using the wireless communicator.

[0272] 16. The energy storage of item 15, wherein the electromagnetic signal is a RFID-, NFC- or Bluetooth-signal emitted from the external device such as a smartphone, a wearable electronic device, or a tablet computer.

[0273] 17. The energy storage of one of items 3 to 16, further comprising a further wireless communicator, wherein the energy storage management system is configured for sending a signal relating to the state of charge to the further wireless communicator and the further wireless communicator is configured to send an electromagnetic signal to an external device based on the signal from the energy storage management system.

[0274] 18. The energy storage of one of items 3 to 17, wherein the energy storage management system is further configured to determine at least one of a state of health of the at least one energy storage unit and a predicted range of the powered device based on the state of charge. A computer-implemented method for displaying a state of charge of an energy storage for a powered device, the method comprising the steps: determining by an energy storage management system of the energy storage the state of charge of at least one energy storage unit of the energy storage; outputting a signal corresponding to the state of charge to a display unit; displaying, using the display unit, at least the state of charge; stopping the supply of power to the display unit; maintain displaying, using the display unit, at least the state of charge without continuous supply of power. The computer-implemented method according to item 19, further comprising determining, by the energy storage management system, at least one of a state of health of the at least one energy storage unit and a predicted range powered device based on the state of charge; outputting, by the energy storage management system, a signal relating to at least one of the state of health and the predicted range to the display unit; displaying, using the display unit, at least one of the state of health and the predicted range. The computer-implemented method according to item 19 or 20, further comprising determining, by the energy storage management system, a time information relating to one of a time at which the energy storage management system has determined the state of charge or a time at which the display unit changed the displayed state of charge to the displayed value; outputting, by the energy storage management system, a signal relating to the time information to the display unit; displaying, using the display unit, the time information. 22. The computer-implemented method according to one of items 19 to 21 , further comprising periodically waking the energy storage management system.

[0275] 23. The computer-implemented method according to one of items 19 to 21 , further comprising receiving an electromagnetic signal from an external device an waking the energy storage management system in response to receiving the electromagnetic signal.

[0276] 24.A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method of any one of items 2 and 19 to 23.

[0277] 25. A computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the method of any one of items 2 and 19 to 23.

[0278] 26. A data processing apparatus, comprising means for carrying out the method of items 2 and 19 to 23.

[0279] The items of the fifth itemized list refer to battery systems for electric vehicles, and in particular to electric bicycle (e-bike) batteries, and more specifically to a battery- integrated display system for indicating the state of charge (SOC) and other battery parameters in a persistent, power-efficient, and user-readable format. The invention addresses the technical problem that, in conventional battery systems, SOC and related information cannot be displayed or accessed when the battery is not actively powered, or when it is removed from the host vehicle. Existing solutions typically rely on LED indicators or LCD displays, which consume continuous power and do not retain the display contents once the power supply is deactivated, resulting in energy loss and limited utility during storage, transport, or stand-alone operation.

[0280] To solve this problem, the solution provides a battery system that includes an integrated electronic paper (E-Ink) display which can be coupled with a programmable wake-up mechanism. The E-Ink display is configured to present at least the state of charge (SOC) of the battery, and optionally additional battery-related parameters, such as timestamp of last update of displayed SOC-value, battery health indicators, number of charge cycles, last charge timestamp, and predicted remaining range. The display is further configured to retain the displayed information without requiring a continuous electrical power supply, thereby offering a persistent visual output even when the battery is powered down or disconnected from the bicycle.

[0281] The battery management system is operatively connected to the E-Ink display and is configured to update the display in response to predefined events, such as manual activation, external signal detection, or a scheduled and programmable update cycle. In one embodiment, the system includes a programmable timer or control logic that periodically wakes the BMS from a low-power or idle state in order to refresh the SOC data displayed on the E-Ink screen. The frequency of these wake-up intervals can be defined based on user requirements or application-specific needs, allowing for an optimal balance between update accuracy and energy conservation.

[0282] The E-Ink display is chosen for its exceptionally low power consumption, as it requires electrical power only during display updates and not for maintaining the visual output. This makes it suited for battery systems where preserving energy during idle periods is required. The display technology also offers high contrast and readability under various lighting conditions, including direct sunlight and low-light environments, making the battery status visible at a glance without the need for active backlighting.

[0283] In addition to displaying the SOC, the system may also show other useful information for the user or service technician, such as maintenance alerts, diagnostic notifications, connectivity status with external devices (e.g., Bluetooth pairing indication), or customizable messages controlled via an associated application. Anti-theft features can also be supported by displaying a lock symbol or ownership identification code on the display when the battery is inactive.

[0284] A further advantage of the solution is its compatibility with smart ecosystems. The BMS may be designed to receive input from or transmit data to external devices such as smartphones or maintenance terminals and update the display accordingly. This allows for integration into app-based user interfaces or fleet management platforms, enabling automated updates, user-defined display preferences, and seamless synchronization of battery-related data.

[0285] The integration of a persistent display directly into the battery housing, combined with a low-power control mechanism and optional programmable wake-up functionality, offers multiple technical advantages. These include improved energy efficiency, enhanced user accessibility, increased system transparency, and greater independence of the battery system from the host vehicle. The invention also enhances the battery’s usability in scenarios where batteries are stored, shipped, or handled outside the context of their operational environment, such as in warehouses, retail displays, or service centers.

[0286] The solution thus provides an energy-efficient, highly readable, and information-rich display system integrated into an e-bike battery. It enables users to monitor the SOC and other battery conditions at any time, even when the battery is disconnected or inactive, thereby solving a persistent usability gap in conventional battery designs while supporting modem demands for digital integration, long battery life, and robust usability across a range of operating conditions.

[0287] The sixth itemized list refers to the aspect relating to a battery for an electric bicycle and a method for providing information relating to a state of charge of a battery for an electric bicycle. The items of the sixth itemized list can be combined with one or more items of all other itemized lists in this document as well as with one or more features of the claims.

[0288] Sixth itemized list:

[0289] 1. A battery for an electric bicycle, the battery comprising: a housing; at least one battery cell arranged within the housing; a battery management system arranged within the housing and configured to determine a state of charge of the at least one battery cell; and a wireless communicator configured to send at least one of an RFID-, NFC-, or Bluetooth-signal relating to the state of charge to an external device. 2. A computer-implemented method for providing information relating to a state of charge of a battery for an electric bicycle, the method comprising the steps: receiving, by a wireless communicator, at least one of an RFID-, NFC-, or Bluetooth-signal from an external device; determining by a battery management system of the battery the state of charge of at least one battery cell of the battery; outputting a signal corresponding to the state of charge to the wireless communicator; sending, using the wireless communicator, at least one of an RFID-, NFC-, or Bluetooth-signal relating to the state of charge to the external device.

[0290] 3. An energy storage for a powered device, the energy storage comprising: a housing; at least one energy storage unit arranged within the housing; an energy storage management system arranged within the housing and configured to determine a state of charge of the at least one energy storage unit; and a wireless communicator configured to send an electromagnetic signal relating to the state of charge to an external device.

[0291] 4. The energy storage of item 3, wherein the at least one energy storage unit is one of a battery cell or a capacitor.

[0292] 5. The energy storage of items 3 or 4, wherein the wireless communicator communicates with the external device based on at least one of RFID, NFC or Bluetooth.

[0293] 6. The energy storage of one of items 3 to 5, wherein energy storage management system is configured to send a signal relating to the state of charge to the wireless communicator and the wireless communicator. 7. The energy storage of one of items 3 to 6, wherein the wireless communicator is further configured to send an electromagnetic signal relating a time information to the external device.

[0294] 8. The energy storage of item 7, wherein the time information is one of a date or a timestamp.

[0295] 9. The energy storage of item 7 or 8, wherein the time information relates to one of a time at which the energy storage management system has determined the state of charge or a time at which the wireless communicator last sent the electromagnetic signal.

[0296] 10. The energy storage of one of items 7 to 9, wherein the energy management system is configured to send a time signal relating to the time at which the energy storage management system has determined the state of charge to the wireless communicator.

[0297] 11. The energy storage of one of items 3 to 10, wherein the energy storage management system is configured to periodically determine the state of charge and to periodically send a signal relating to the state of charge to the wireless communicator.

[0298] 12. The energy storage of item 11 , wherein the energy storage management system periodically wakes itself to periodically determine the state of charge.

[0299] 13. The energy storage of item 11 or 12, wherein the energy storage management system goes into a sleep mode after sending the signal to the display unit.

[0300] 14. The energy storage of one of items 11 to 13, wherein the wireless communicator periodically sends an electromagnetic signal relating to the state of charge to the external device.

[0301] 15. The energy storage of one of items 3 to 14, wherein the external device is at least one of a smartphone, a wearable electronic device, or a tablet computer. The energy storage of one of items 3 to 15, wherein the energy storage management system is further configured to determine at least one of a state of health of the at least one energy storage unit and a predicted range of the powered device based on the state of charge; and the wireless communicator is configured to send an electromagnetic signal relating to at least one of the state of health or the predicted range to the external device. A computer-implemented method for providing information relating to a state of charge of an energy storage for a powered device, the method comprising the steps: determining by an energy storage management system of the energy storage the state of charge of at least one energy storage unit of the energy storage; outputting a signal corresponding to the state of charge to a wireless communicator; sending, using the wireless communicator, an electromagnetic signal relating to the state of charge to an external device. The computer-implemented method according to item 17, further comprising receiving, by the wireless communicator, an electromagnetic signal from the external device, wherein determining, by the energy storage management system, the state of charge is executed in response to receiving the signal from the external device. The computer-implemented method according to items 17 or 18, wherein sending, using the wireless communicator, the electromagnetic signal relating to the state of charge to the external device is executed in response to receiving the signal from the external device. 20. The computer-implemented method according to one of items 17 to 19, wherein the signal sent to the external device is at least one of an RFID-, NFC-, or Bluetooth-signal.

[0302] 21. The computer-implemented method according to one of items 18 to 20, wherein the signal received from the external device is at least one of an RFID-, NFC-, or Bluetooth-signal.

[0303] 22. The computer-implemented method according to one of items 17 to 21 , further comprising determining, by the energy storage management system, at least one of a state of health of the at least one energy storage unit and a predicted range powered device based on the state of charge; outputting, by the energy storage management system, a signal relating to at least one of the state of health and the predicted range to the wireless communicator; sending, using the wireless communicator, an electromagnetic signal relating to at least one of the state of health and the predicted range to the external device.

[0304] 23. The computer-implemented method according to one of items 17 to 22, further comprising determining, by the energy storage management system, a time information relating to a time at which the energy storage management system has determined the state of charge; outputting, by the energy storage management system, a signal relating to the time information to the wireless communicator; sending, using the wireless communicator, an electromagnetic signal relating to the time information to the external device.

[0305] 24. The computer-implemented method according to one of items 17 to 23, further comprising periodically waking the energy storage management system. 25. The computer-implemented method according to one of items 18 to 24, further comprising waking the energy storage management system in response to receiving the electromagnetic signal from the external device.

[0306] 26.A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method of any one of items 2 and 17 to 25

[0307] 27. A computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the method of any one of items 2 and 17 to 25.

[0308] 28. A data processing apparatus, comprising means for carrying out the method of items 2 and 17 to 25.

[0309] The items of the sixth itemized list relate to battery systems for electrically powered vehicles, and more particularly to electric bicycle (e-bike) batteries with wireless communication functionality for external device integration. The invention addresses the technical challenge that in conventional battery systems, the state of charge (SOC), battery health status, and other operational parameters can typically only be accessed when the battery is installed in the vehicle and connected to its onboard systems. This limitation creates practical and operational inefficiencies, particularly for end users, service technicians, and fleet operators who need to monitor battery conditions during storage, transport, or while the battery is otherwise removed from the e-bike.

[0310] To overcome this limitation, the invention provides a battery system comprising a battery management system (BMS) and an integrated wireless communication module configured to transmit battery-related information to external devices. The communication module is operatively connected to the BMS and is designed to establish wireless data links with external readers, smartphones, or service terminals using standardized protocols, such as Bluetooth, near-field communication (NFC), or radio-frequency identification (RFID). These protocols allow the external device to receive real-time or stored information from the battery without the need for physical connections or mechanical interfaces. The BMS monitors and stores operational data including, but not limited to, the state of charge (SOC), battery health status (such as cycle count or capacity degradation), time since last charge, date of last charge, and predicted range based on current battery condition and historical usage patterns. Upon initiation of a wireless communication session either automatically in response to a connection attempt from an external device or as a result of user input, the BMS transmits the relevant data via the integrated communication module. Depending on the protocol used, this may involve active pairing (as in Bluetooth), passive data reading (as in RFID), or closeproximity activation (as in NFC).

[0311] In one embodiment, the battery system is configured to support bi-directional communication with a smartphone application. This allows the user not only to receive battery data but also to access diagnostic tools, receive maintenance notifications, and initiate firmware updates or configuration changes. The application interface may further provide security features such as ownership identification, locking status, and service authorization.

[0312] The solution enables the communication module and BMS to operate in a highly energy-efficient manner, with the communication module remaining in a low-power standby state when not actively engaged in data transmission. Wake-up mechanisms may include magnetic or wireless triggers, programmable timers, or periodic activation cycles to check for external device presence or connection requests. This design preserves battery life and ensures long-term operability without draining stored energy during idle periods.

[0313] An advantage of the solution is its support for SOC and battery status monitoring even when the battery is disconnected from the bicycle. This enhances user convenience by eliminating the need to re-install the battery for basic status checks, and it allows technicians to quickly access operational data during inspection or servicing. In fleet scenarios, centralized monitoring of battery conditions becomes feasible without requiring physical access to each e-bike, enabling more efficient battery rotation, charging scheduling, and performance tracking. Furthermore, the system allows for flexible integration into a wide range of use cases, including smart mobility systems, connected maintenance platforms, and third-party diagnostic tools. The modular nature of the wireless interface allows battery manufacturers to support a variety of communication protocols with minimal hardware adaptation, and to offer scalable solutions for consumer, commercial, and industrial applications.

[0314] In summary, the solution provides a sealed battery system capable of transmitting SOC and related battery data wirelessly to external devices, thereby eliminating physical access constraints and enabling smart device integration. It significantly improves usability, supports energy-efficient operation, enhances serviceability, and aligns with modern expectations for wireless connectivity in e-mobility ecosystems.

[0315] The solutions of the second to sixth itemized lists can also be applied to the range extender of the present application, for example for activating a battery management system of the range extender and for displaying and / or outputting the SOC of the range extender.

[0316] The energy storage of the above itemized lists can be a battery. The powered device of the above itemized lists can be an electric bicycle. The energy storage unit of the above itemized lists can be a battery cell. The energy storage management system of the above itemized lists can be a battery management system. The magnetic element of the above itemized lists can be a magnet. The guiding of the above itemized lists can be a guide rail. The sensing unit of the above itemized lists can be a wireless communicator. The display unit of the above itemized lists can be an E-ink display.

[0317] For each one of the examples or embodiments herein presented, there are methods for making a range extender for an electric bicycle disclosed, the range extender manufactured by a method that comprises the steps of:

[0318] - providing: an electric motor, an internal battery for supplying the electric motor with power, a bicycle control unit , and a range extender according to any of the examples or embodiments, be it coupled to a holding device according to any of the examples or embodiments or not,

[0319] - connecting the interface of the holding device to the bicycle control unit , the internal battery and / or the electric motor, and

[0320] - loading a computer software into a memory unit of the bicycle control unit, the computer software causing the bicycle control unit to manage energy distribution and operation, including interactions between the internal battery, the electric motor, and the range extender, wherein this step can also be provided alone, before the other steps are provided,

[0321] Or the steps of

[0322] - providing: an electric motor, an internal battery for supplying the electric motor with power, a bicycle control unit, and a range extender according to any of the examples or embodiments, be it coupled to a holding device according to any of the examples or embodiments or not,

[0323] - connecting the interface of the holding device to the bicycle control unit, the internal battery and / or the electric motor, and

[0324] - configuring the bicycle control unit to enable the bicycle control unit to manage energy distribution and operation, including interactions between the internal battery, the electric motor, and the range extender (3), wherein this step can also be provided alone, before the other steps are provided,

[0325] Or the steps of

[0326] - providing: an electric motor, an internal battery for supplying the electric motor with power, a bicycle control unit, and a range extender according to any of the examples or embodiments, be it coupled to a holding device according to any of the examples or embodiments or not, - connecting the interface of the holding device to the bicycle control unit , the internal battery and / or the electric motor, and

[0327] - configuring a computer software of the bicycle control unit, the computer software causing the bicycle control unit to manage energy distribution and operation, including interactions between the internal battery, the electric motor, and the range extender, wherein this step can also be provided alone, before the other steps are provided,

[0328] Or the steps of

[0329] - providing: an electric motor, an internal battery for supplying the electric motor with power, a bicycle control unit, and a range extender according to any of the examples or embodiments, be it coupled to a holding device according to any of the examples or embodiments or not,

[0330] - connecting the interface of the holding device to the bicycle control unit , the internal battery and / or the electric motor, and

[0331] - providing and connecting a memory unit to the bicycle control unit, wherein the memory unit comprises a computer software, the computer software causing the bicycle control unit to manage energy distribution and operation, including interactions between the internal battery, the electric motor, and the range extender, wherein this step can also be provided alone, before the other steps are provided,

[0332] Or the steps of

[0333] - providing: an electric motor, an internal battery for supplying the electric motor with power, a bicycle control unit, and a range extender according to any of the examples or embodiments, be it coupled to a holding device according to any of the examples or embodiments or not,

[0334] - connecting the interface of the holding device to the bicycle control unit , the internal battery and / or the electric motor, and - connecting the electric motor and the internal battery with the bicycle control unit; wherein the bicycle control unit is configured to manage energy distribution and operation, including interactions between the internal battery, the electric motor, and the range extender, wherein this bicycle control unit can also be provided alone, before the other steps are provided,

[0335] Protection may be sought for combinations of features of the earlier mentioned embodiments of the present application, which are also disclosed in the referenced earlier patent applications DE 10 2024 129 795.6 of 15 October 2024, EP 25208701.0 of 14 October 2025 and EP 25208705.1 of 14 October 2025, the contents of which are herein incorporated by reference. It is disclosed there how these features combinations contribute to achieving the technical aim of the present application and these features combinations are thus comprised in the solution of the technical problem underlying the subject matter of the present application. The features and combinations which are disclosed in the reference documents implicitly belong to the description of the subject matter in the present application and thus to the content of the present application as filed.

[0336] REFERENCE NUMERAL LIST

[0337] 1 electric bicycle

[0338] 3 range extender

[0339] 5 holding device

[0340] 7 electric motor

[0341] 9 battery of the electric bicycle

[0342] 11 bicycle control unit

[0343] 13 charging device

[0344] 15 range extender control unit

[0345] 19 frame

[0346] 21 energy management system

[0347] 23 inductive coil of the holding device

[0348] 24 Inductive coil of the range extender

[0349] 25 housing

[0350] 29 cable

[0351] 33 fastening means

[0352] 35 clamping element

[0353] 37 base element

[0354] 39 rigid bar

[0355] 40 housing

[0356] 42 guiding

[0357] 44 detention element

[0358] 46 flap

[0359] 48 hinge

[0360] 50 sensing element

[0361] 52 printed circuit board

[0362] 54 conductive trace

[0363] 60 magnetic element

[0364] 65 ferromagnetic element

[0365] 70 display

[0366] 80 Switch area

[0367] 101 detecting if a magnetic element is moved activating the energy storage management system triggering the determination of a state of charge outputting the state of charge detecting if a ferromagnetic element is moved activating the energy storage management system triggering the determination of a state of charge outputting the state of charge detecting an electromagnetic signal activating the energy storage management system triggering the determination of a state of charge outputting the state of charge determining the state of charge outputting a signal corresponding to the state of charge displaying the state of charge stopping the supply of power to the display unit maintain displaying the state of charge without continuous supply of power determining the state of charge outputting a signal corresponding to the state of charge sending an electromagnetic signal relating to the state of charge waking the energy storage management system receiving an electromagnetic signal

Claims

CLAIMS1 . A range extender (3) for an electric bicycle (1 ), comprising- a housing (25), and- a rechargeable battery, and- a control unit (15) with a communication unit capable of being in data communication with an electric bicycle’s control unit (11 ), and- an interface for coupling the battery to a charging device (13) for charging the battery and for coupling the battery to a load for supplying power to the load; wherein the interface for charging the battery and / or supplying power to a load comprises an inductive coil (24).

2. The range extender (3) according to claim 1 , wherein the communication unit is capable of wireless communication and includes a transmitter and a receiver.

3. The range extender (3) according to claim 1 or claim 2, wherein the housing (25) is cylindrical and / or comprises a bottle-shaped design.

4. The range extender (3) according to claim 3, wherein the interface for charging the battery and / or supplying power to a load, particularly the inductive coil (24), is positioned in a bottom section of the cylindrical housing (25).

5. A holding device (5) for a range extender (3) to couple the range extender (3) with an electric bicycle (1 ), comprising:- a receiving element for holding the range extender (3),- fastening means (33) for securely attaching the receiving element to a frame (19) of the electric bicycle (1 ), and- an interface capable of coupling the range extender’s (3) battery to the internal battery (9) and / or electric motor (7) of the electric bicycle (1 ); wherein the interface comprises an inductive coil (23).

6. The holding device (5) according to claim 5,wherein the receiving element comprises a clamping element (35) and a base element (37) coupled to the clamping element (35),- wherein the clamping element (35) is configured to exert a clamping force on an outer surface of a housing (25) of the range extender (3), and- wherein the base element (37) is arranged to contact a bottom of the housing (25) of the range extender (3), in order to limit axial displacement, when a range extender (3) is held by the receiving element.

7. The holding device (5) according to claim 5 or claim 6, wherein the clamping element (35) and the base element (37) are coupled by a rigid bar (39), the bar (39) comprising fastening means (33) for attaching the holding device (5) to a frame (19) of an electric bicycle (1 ).

8. A kit comprising a range extender (3) according to any of the preceding claims 1 - 4 and a holding device (5) according to any of the preceding claims 5 - 7.

9. An electric bicycle (1 ), comprising:- an electric motor (7), and- an internal battery (9) for supplying the electric motor (7) with power, and- a bicycle control unit (11 ), and- a range extender (3) according to any of the preceding claims 1 - 4, coupled to a holding device (5) according to any of the preceding claims 5 - 7, wherein the holding device (5) is attached to a frame (19) of the electric bicycle (1 ) via fastening means (33), and the interface of the holding device (5) being coupled to the bicycle control unit (11 ), the internal battery (9) and / or the electric motor (7).

10. The electric bicycle (1 ) according to claim 9, wherein the bicycle control (11 ) unit comprises a transmitter and a receiver and is in wireless data communication with the range extender’s (3) control unit (15).11 . The electric bicycle (1 ) according to claim 9 or claim 10,wherein the bicycle control unit (11 ) is configured to manage energy distribution and operation, including interactions between the internal battery (9), the electric motor (7), and the range extender (3).

12. The electric bicycle (1 ) according to any of the preceding claims 9 - 11 , further comprising an additional interface for directly coupling the internal battery (9) to a charging device (13) or an external device, such as a smartphone.

13. A method for charging the electric bicycle (1 ) according to any of the preceding claims 9 - 12, comprising the following steps:- charging the battery of the range extender (3) via a cable (29),- simultaneous or time-shifted charging of the internal battery (9) of the electric bicycle (1 ) by inductive coupling of the range extender (3) and the holding device (5), or- charging of the internal battery (9) of the electric bicycle (1 ) via a cable (29),- simultaneous or time-shifted charging of the battery of the range extender (3) by inductive coupling of the range extender (3) and the holding device (5).

14. A range extender (3) for an electric bicycle (1 ), the range extender (3) manufactured by a method that comprises the step of:- loading a computer software into a memory unit of the bicycle control unit (11 ), the computer software causing the bicycle control unit (11 ) to manage energy distribution and operation, including interactions between the internal battery (9), the electric motor (7), and the range extender (3).

15. A range extender (3) for an electric bicycle (1 ), the range extender (3) manufactured by a method that comprises the step of:- configuring the bicycle control unit (11 ) to enable the bicycle control unit (11 ) to manage energy distribution and operation, including interactionsbetween the internal battery (9), the electric motor (7), and the range extender (3)16. A range extender (3) for an electric bicycle (1 ), the range extender (3) manufactured by a method that comprises the step of:- configuring a computer software of the bicycle control unit (11 ), the computer software causing the bicycle control unit (11 ) to manage energy distribution and operation, including interactions between the internal battery (9), the electric motor (7), and the range extender (3)17. A range extender (3) for an electric bicycle (1 ), the range extender (3) manufactured by a method that comprises the step of:- providing and connecting a memory unit to the bicycle control unit (11 ), wherein the memory unit comprises a computer software, the computer software causing the bicycle control unit (11 ) to manage energy distribution and operation, including interactions between the internal battery (9), the electric motor (7), and the range extender (3)18. A range extender (3) for an electric bicycle (1 ), the range extender (3) manufactured by a method that comprises the step of:- connecting the electric motor (7) and the internal battery (9) with the bicycle control unit (11 ); wherein the bicycle control unit (11 ) is configured to manage energy distribution and operation, including interactions between the internal battery (9), the electric motor (7), and the range extender (3)

Images