Modular e-bike battery system

Abstract

The invention relates to a modular e-bike battery system (1; 20), comprising a battery pack (2; 22), a fixed fastening module (6; 26; 46; 56) and a transportable fastening module (7; 27; 47; 57), the battery pack comprising a module interface (3; 23; 43; 53) for connecting to the fixed fastening module and for alternatively connecting to the transportable fastening module. The e-bike battery system can assume a fixed state and a transportable state, the fixed fastening module being designed for the permanently fixed installation of the battery pack on or in an e-bike, and the transportable fastening module being designed for repeatedly connecting the battery pack to and detaching it from an e-bike. The invention further relates to e-bikes comprising corresponding battery packs and to a method for equipping e-bikes with battery packs of this kind.

Description

[0001] FAZ-081-PCT 1 23.01.2026

[0002] Modular e-bike battery system

[0003] The present invention relates to a modular e-bike battery system for the detachable or alternatively permanent connection of a battery pack to a suitably equipped e-bike. The invention further relates to e-bikes with corresponding battery packs, as well as a method for equipping e-bikes with corresponding battery packs, and corresponding battery packs.

[0004] E-bikes require a battery pack to power them. The battery pack primarily serves to provide energy for the e-bike's drive motor. It also typically supplies power to the drive control unit and peripheral devices such as the e-bike's lights.

[0005] Current technology includes battery packs that are permanently attached to the e-bike. These battery packs are usually connected to the e-bike frame and are at least partially located within the frame, for example, in the downtube. Permanently attached battery packs can be connected to the e-bike via a screw connection, adhesive bond, weld, clamp connection, and / or a positive-locking connection, and can be positioned within the frame in a way that is more or less inaccessible to the end user. The advantage of permanently attached battery packs is that the e-bikes and their frames can be designed to be slim and visually appealing, as the battery pack requires less space than a removable one.Since the permanently installed battery pack remains in the e-bike, it can be directly connected to the electrical system, eliminating the need for detachable electrical connectors. However, a disadvantage is that a charging cable must be run to the e-bike to charge the battery pack, and replacing it in case of a defect can be difficult. Using such a permanently installed battery pack in other e-bike types or models is not practical.

[0006] Furthermore, battery packs are also known that can be detachably connected to an e-bike or its frame. Detachable battery packs are easily accessible to the end customer via their mechanical mounting device. A detachable battery pack can be removed from and reattached to the e-bike in just a few steps and regularly without tools. (FAZ-081-PCT 2 23.01.2026)

[0007] Removable battery packs offer the significant advantage of being easily detached from the e-bike for charging at any location. Furthermore, multiple battery packs can be used with a single e-bike, or several e-bikes can share a single battery pack. A disadvantage of removable battery packs is the relatively large interface required on the e-bike for mounting and electrically connecting the battery pack. If the battery pack is to be visually integrated into the e-bike frame, a large recess must be incorporated, posing both design and aesthetic challenges for e-bike manufacturers. Due to their removable design, battery packs are generally heavier and larger than comparable non-removable (or permanently fixed) battery packs.

[0008] A fundamental challenge for e-bike manufacturers is that battery packs often have to undergo important but complex approval processes to ensure that, in addition to the technical aspects of the products, their compliance with safety requirements for their intended use is proven in advance. As long as different battery packs are used for many different e-bike types and variants, and therefore each requires testing, the effort involved in such approval procedures remains high.

[0009] Therefore, the present invention is based on the objective of providing an e-bike battery system, e-bikes, a method for equipping e-bikes with battery packs, and battery packs themselves, which combine at least some of the described advantages of known battery packs and at least some of the described disadvantages.

[0010] This problem is solved by the subject matter of the independent claims. Further, particularly advantageous embodiments of the invention are disclosed in the respective dependent claims.

[0011] It should be noted that the features listed individually in the claims can be combined with one another in any technically meaningful way (even across category boundaries, for example between method and apparatus) and demonstrate further embodiments of the invention. In particular, features of the proposed modular e-bike battery system or of exemplary embodiments thereof can be transferred to the proposed e-bikes and the proposed battery pack and represent further exemplary embodiments of the e-bikes or the battery pack (and conversely, features of the e-bikes or the battery pack can be transferred to the proposed e-bikes or the proposed battery pack).

[0012] (the modular e-bike battery system can be transferred). The description further characterizes and specifies the invention, particularly in connection with the figures.

[0013] It should also be noted that the conjunction “and / or” used herein, which stands between two features and links them together, is always to be interpreted in such a way that in a first embodiment of the object according to the invention only the first feature may be present, in a second embodiment only the second feature may be present, and in a third embodiment both the first and the second feature may be present.

[0014] Central to the present invention is the realization that a modular design of the e-bike battery system allows for various configurations that can meet the different requirements of removable or permanently fixed mounting. Crucially, a large part of the e-bike battery system, including the battery pack itself (which is subject to testing due to its electronic components and battery cells), can be used unchanged in all configurations. In this way, for example, a battery pack version can be developed and approved that can be used in different applications and e-bikes, either permanently fixed or removable.

[0015] Specifically, the invention therefore comprises a modular e-bike battery system consisting of a battery pack, a fixed mounting module, and a portable mounting module. The battery pack has a module interface for connecting to the fixed mounting module and, alternatively, to the portable mounting module. The e-bike battery system can assume a fixed state and a portable state.

[0016] In the fixed state of the e-bike battery system, the fixed mounting module is connected to the battery pack via the module interface. The fixed mounting module is designed for permanently securing the battery pack to or within an e-bike according to a fixed battery configuration. This can be achieved by connecting the fixed mounting module to the e-bike or its frame via a screw connection, a weld connection, an adhesive connection, a clamp connection, and / or a positive-locking connection. Particularly when using a clamp connection or positive-locking connection, the dimensions of the fixed mounting module are selected to ensure a positive fit between the e-bike and the battery pack (including the fixed mounting module). FAZ-081-PCT 4 23.01.2026

[0017] In other words, the fixed mounting module is sized so that the battery pack, with the fixed mounting module attached, can be inserted into a recess in the e-bike or its frame with virtually no play. The size of the battery pack is thus adapted to the size of the recess in the e-bike by means of the fixed mounting module.

[0018] In the transportable state of the e-bike battery system, the transportable mounting module is connected to the battery pack via the module interface. The transportable mounting module is designed for repeated, and in particular tool-free, connection and disconnection of the battery pack to an e-bike according to a transportable battery configuration. The transportable mounting module does not need to be permanently connected to the battery pack via the module interface in the transportable state. Rather, the transportable mounting module can also be attached to the e-bike, for example, or...whose frame remains and is only connected to the battery pack via the module interface of the battery pack used when the battery pack is connected to the frame, i.e., temporarily connected to the battery pack, while when the battery pack is removed, there is no connection between the transportable mounting module and the module interface and thus no connection to the battery pack.

[0019] Essential to the e-bike battery system is that it comprises three components: the battery pack, the fixed mounting module, and the portable mounting module. The battery pack can be connected to either the portable mounting module (into the portable state) or the fixed mounting module (into the fixed state). Both or more mounting modules cannot be connected to the same module interface of the battery pack simultaneously; only one of the two mounting modules can be connected to the same module interface at any given time. These two alternative states of the e-bike battery system allow the battery pack itself to be adapted to different requirements and different e-bikes.

[0020] The present battery pack serves to supply energy to the drive system of the e-bike, but can also supply energy to other peripheral devices of the e-bike, such as lighting equipment, control units or the like.

[0021] The battery pack preferably comprises several battery cells arranged in a housing of the battery pack. The battery pack may, in particular, include further electronics, such as a battery management system (BMS). FAZ-081-PCT 5 23.01.2026

[0022] The battery pack preferably has a capacity of 200 Wh to 2000 Wh, more preferably 500 Wh to 1000 Wh.

[0023] The e-bike battery system comprises at least two mounting modules – the fixed mounting module and the portable mounting module – which allow the battery pack to be mechanically connected to an e-bike. The e-bike battery system can also include three or even four mounting modules. This allows both sides of the battery pack, the top and the bottom, to each have their own module interface. The top-side module interface can then be connected to two mounting modules, either the (top-side) fixed mounting module or the (top-side) portable mounting module.This applies analogously to the underside of the battery pack and any module interface that may be provided there, which can, for example, be connected to two mounting modules: either the (underside) fixed mounting module or the (underside) portable mounting module. Thus, an e-bike battery system can certainly have up to four mounting modules. A version with module interfaces on both sides—one on the top and one on the bottom—is also conceivable, which would then interact with, for example, only three fundamentally different mounting modules.It is conceivable that in one embodiment of an e-bike battery system, both the fixed mounting module and the transportable mounting module are identical (and differ, for example, only in the provision of different connecting means, which are permanently attached in the fixed state). A particularly preferred embodiment of the e-bike battery system is characterized, for example, by the fact that the underside fixed mounting module and the underside transportable mounting module are identical, each present only once in the system, and that, only in the fixed state, the fixed mounting module, which is identical to the transportable mounting module, is permanently connected to the underside of the battery pack via a connecting means at the module interface located there.

[0024] The fixed mounting module is a mounting module that allows the battery pack to be permanently and securely attached to an e-bike or installed in / on it. "Permanently and securely attached" or "permanently and securely installed" means, in the context of the application, that the battery pack cannot be easily removed, for example, without tools, and therefore not solely by hand, without damage, or without FAZ-081-PCT 6 23.01.2026

[0025] Disassembly of other e-bike components, and / or it cannot be removed from the e-bike without increased effort, etc. As a rule, the battery pack is permanently installed or permanently connected to the e-bike at the factory (by the manufacturer), and removing the battery pack from the e-bike is not intended for the end customer. However, it is not impossible that the battery pack could be removed from the e-bike again, for example, through the use of special tools or by a specialist workshop. Therefore, a "permanent connection" is not the intended solution.The term "permanently fixed connection" is to be understood specifically as meaning that the connection between the respective mounting module (in particular the transportable mounting module or fixed mounting module) and the frame of the e-bike or other components of the e-bike is designed in such a way that it cannot be released by the user during normal daily use without the use of tools and / or the removal of other (e-bike) components that obstruct access. While the connection may, in principle, be designed to be detachable, the possibility of detachment is then not intended for the end customer in normal use or achievable without increased effort. This definition applies to all occurrences of the term "permanently connected" or "permanently fixed" in the entire application, including the claims, unless explicitly stated otherwise.

[0026] A fixed-state e-bike battery system, i.e., a battery pack with a fixed mounting module, can also be understood as an internal battery pack, especially if the battery pack is located within the frame of the e-bike and is not directly accessible from the external environment of the e-bike during its intended use.

[0027] The portable mounting module, however, is not intended for a permanent, fixed connection of the battery pack to the e-bike, but rather for a detachable connection. A detachable connection, as defined in the application, is a mechanical connection between the battery pack or the portable mounting module and an e-bike that can be repeatedly (multiple times) disconnected and reconnected. This disconnection and connection can be performed, for example, without tools, without damage, without destruction, and / or without disassembling other components of the e-bike, etc., and can be easily carried out by the end customer. When the battery pack is connected to the e-bike using the portable mounting module, the battery pack is mechanically fixed to the e-bike, but the connection – as described above – can be easily disconnected.The battery pack, when connected to the e-bike, is directly accessible from the outside. If the battery pack is detached, see FAZ-081-PCT 7 23.01.2026.

[0028] The battery pack can be removed from the e-bike along with its module interface and, if applicable, the portable mounting module, or it can be removed along with just its module interface, while the portable mounting module remains attached to the e-bike. The battery pack can then be reconnected to the e-bike.

[0029] The mounting modules are connected to the battery pack via the module interface. The module interface is designed to be connected to either the fixed mounting module or, alternatively, the portable mounting module. Only one of the two mounting modules (fixed mounting module and portable mounting module) can be connected to the module interface at any given time.

[0030] The connection between the module interface and the fixed mounting module, as well as the connection between the module interface and the transportable mounting module, can be permanently fixed or detachable.

[0031] Preferably, a seal can be provided for the module interface, designed to seal a contact area between the module interface and the portable mounting module or between the module interface and the fixed mounting module. In particular, the seal seals the electrical contact between the module interface and the portable mounting module or between the module interface and the fixed mounting module. The seal protects the contact area of ​​the module interface from external influences such as moisture and contaminants. The seal can be located at the module interface, or a seal can be provided on each of the mounting modules. The seal can also be located on the battery pack or its housing. Preferably, the seal is located in the contact area between the module interface and the respective mounting module.Such a seal can preferably be designed as a sealing ring, for example an O-ring, or a sealing lip, which is preferably made of rubber or silicone. The seal, sealing ring, O-ring, or sealing lip can preferably have or consist of a permanently elastic material. For example, the seal, sealing ring, O-ring, or sealing lip can have or consist of rubber, for example NBR (nitrile rubber), silicone, PTFE, FKM, or polyurethane. FAZ-081-PCT 8 23.01.2026.

[0032] An e-bike with a fixed battery configuration is designed to permanently and securely mount a battery pack. Such an e-bike is therefore configured to accommodate the e-bike battery system in a fixed configuration. The e-bike may have corresponding components that interact with the fixed mounting module or other connection devices of the e-bike battery system or battery pack to permanently and securely attach the battery pack to the e-bike.

[0033] In contrast, an e-bike with a transportable battery configuration is designed to accommodate a detachable battery pack. Such an e-bike is therefore configured to hold the e-bike battery system in a transportable state. The e-bike may have corresponding features that interact with the transportable mounting module or other connection devices of the e-bike battery system or battery pack to detachably connect the battery pack to the e-bike.

[0034] The e-bikes have mounting areas for the battery pack, each adapted to the specific battery pack being used. For example, a mounting area for a battery pack permanently attached to the e-bike can be smaller, as these battery packs are typically smaller. Accessibility of the mounting area is not strictly necessary for the intended use of the e-bike. For instance, such a mounting area could be the interior of a frame, such as a frame tube like the down tube, where the battery pack is permanently mounted without being easily accessible from the outside, as the frame tube remains completely enclosed. In contrast, the mounting area for a detachably attached battery pack must be accessible for the intended use of the e-bike so that the end customer can easily access and remove the battery pack.The user can detach the battery pack from the e-bike and remove it. Such a mounting area is generally larger, as it requires removable fastening mechanisms that are larger than permanently fixed ones, and accessibility must be ensured. This mounting space can also be the interior of a frame, for example, a frame tube such as the down tube, where the battery pack is not permanently mounted but can be detached and removed without tools. This interior is easily accessible from the outside, for example, through an opening or recess in the frame tube through which the battery pack can be inserted and removed. FAZ-081-PCT 9 23.01.2026.

[0035] Advantageous embodiments and variants of the invention are described in the dependent claims and the following description. The features listed individually in the dependent claims can be combined with each other and with the features explained in more detail in the following description in any technically sensible manner, and represent other advantageous embodiments of the invention.

[0036] In a preferred embodiment, the fixed mounting module and the transportable mounting module are identical in design. Preferably, both mounting modules are connected or connectable to the underside of the battery pack. The distinction between the fixed state and the transportable state is preferably achieved by providing at least one additional connecting element, in particular in the form of at least one housing screw, which preferably connects the fixed mounting module to the battery pack. The system can thus be operated flexibly between both states with only one type of mounting module.

[0037] In a preferred embodiment, the transportable mounting module, or at least one of the transportable mounting modules, is designed such that it remains attached to the e-bike, particularly to the frame, even when the battery pack with its module interface(s) has been or is being removed from the e-bike. Preferably, the transportable mounting module is permanently connected to the frame.

[0038] In a preferred embodiment, at least one of the mounting modules of the fixed mounting module and the transportable mounting module is connected or connectable to the battery pack in at least one of the fixed and transportable states via at least one, preferably two, connecting means, in particular housing screws. The connecting means may be aligned approximately parallel to the battery pack axis, but this is not mandatory. Preferably, at least one, and in particular all, of the mounting modules of the fixed mounting module and the transportable mounting module are connected or connectable to the e-bike, in particular to the frame, in at least one of the states, and preferably in both states, via at least one, and preferably two, connecting means, in particular frame screws. The connecting means may preferably be aligned approximately perpendicular to the battery pack axis.Generally, screws, specifically housing screws or frame screws, are preferred as fasteners. This allows for a particularly stable and flexible mounting of the battery pack on the e-bike. However, it is also possible to use other types of fasteners, as described in FAZ-081-PCT 10 23.01.2026.

[0039] For example, clip, plug and / or rail systems, or combinations of all the aforementioned connecting devices. In particular, connecting devices can also be designed as snap hooks, locking tabs, sliding rails or similar mechanical connecting elements that enable a detachable or permanent connection between the battery pack, mounting module and / or frame.

[0040] In a preferred embodiment of the modular e-bike battery system, the same battery pack is used in both states, i.e., in the fixed state and the transportable state. In particular, the same battery cells, the same housing, and / or the same module interface(s) can be used. Preferably, the battery pack, especially including its module interface(s), remains unchanged in both states, thus achieving maximum interchangeability and standardization, regardless of whether an e-bike is to be provided with a user-replaceable or a permanently mounted battery pack.

[0041] In a preferred embodiment, at least one, and preferably all, of the mounting modules of the fixed mounting module and the transportable mounting module utilize standardized attachment points on the battery pack. These attachment points can be configured, in particular, as bores, positive-locking recesses, and / or electrical connectors. Preferably, the different types of mounting modules, i.e., both the fixed mounting module and the transportable mounting module, utilize the same attachment points on the battery pack. This results in a particularly high degree of modularity and interchangeability of the mounting modules.In particular, one or more fixed fastening modules may only have an additional connecting element for permanent connection, which is not easily detachable without tools, compared to the connection of the transportable fastening module via the otherwise identical connection points, but without the use of said additional connection points for the permanent, non-tool-free detachable connecting elements.

[0042] In a preferred embodiment, the at least one, and in particular the, attachment point(s) on the battery pack for the fixed mounting module and the portable mounting module, particularly on the top side, are identical. Preferably, the mounting modules are connected or connectable to the battery pack via the same or the same bore(s). This achieves a particularly high degree of standardization and flexibility in the selection and assembly of the mounting modules. FAZ-081-PCT 11 23.01.2026

[0043] In a preferred embodiment, the lower fixed mounting module and / or the lower transportable mounting module has at least one, preferably at least two, and particularly preferably three, projections. These projections preferably provide a positive locking connection between the battery pack and the respective lower mounting module in two axes. Locking in a third axis can preferably, particularly at least with respect to the lower fixed mounting module in the fixed position, be achieved by a further connecting element, especially a housing screw, which is generally omitted in the transportable mounting module configuration. This ensures a particularly secure, backlash-free, and stable connection between the battery pack and the mounting module.

[0044] In one embodiment of the e-bike battery system, it is characterized by the fact that the battery pack has a mechanical e-bike interface for mechanically connecting the battery pack to the e-bike according to the fixed battery configuration and for alternatively mechanically connecting the battery pack to the e-bike according to the transportable battery configuration.

[0045] It can be advantageous to establish a further mechanical connection to the e-bike using the mechanical e-bike interface, in addition to the mechanical connection via the fixed or transportable mounting module. This way, the battery pack is mechanically connected to the e-bike at two points, resulting in a more stable hold. In one embodiment, the module interface of the battery pack can also fulfill the function of the mechanical e-bike interface.

[0046] The mechanical e-bike interface can preferably be connected directly to the e-bike. For example, the mechanical e-bike interface can interact with a mount on the e-bike to mechanically connect the battery pack to the e-bike.

[0047] The mechanical e-bike interface is preferably arranged opposite the module interface on the battery pack. Preferably, the battery pack has an elongated shape with two opposite ends, with the module interface located at one end and the mechanical e-bike interface at the opposite end.

[0048] The mechanical e-bike interface can interact with both the e-bike according to the fixed battery configuration and the e-bike according to FAZ-081-PCT 12 23.01.2026

[0049] Portable battery configuration. The respective e-bike mounts corresponding to the mechanical e-bike interface can be designed analogously.

[0050] In particular, the mechanical e-bike interface is designed for positive locking. For this positive locking, the mechanical e-bike interface can have a molded recess and / or a recess, each of which corresponds to a specific molded recess or recess in the e-bike.

[0051] Therefore, the mechanical e-bike interface for positive locking with the e-bike according to the fixed battery configuration and for alternative positive locking with the e-bike according to the portable battery configuration has a molded shape and / or recess. The molded shape is preferably at least partially wedge-shaped and / or conical. The recess is preferably at least partially wedge-shaped, conical, and / or tapered.

[0052] In a further embodiment of the e-bike battery system, it is characterized in that the fixed mounting module and the transportable mounting module are connectable to the module interface by at least one screw connection and / or at least one positive-locking connection. The module interface preferably has at least one thread, and in particular two threads, for receiving a screw, wherein the fixed mounting module and the transportable mounting module can be force-fitted to the module interface by means of the at least one screw connection.

[0053] In another embodiment of the e-bike battery system, it is characterized by the fact that the transportable mounting module is designed to be connectable to the e-bike by means of a positive and / or force-locking connection according to the transportable battery configuration.

[0054] In another embodiment of the e-bike battery system, the transportable mounting module is characterized by a tool-free switchable between a locked and an unlocked state. In the locked state, the battery pack is mechanically and firmly connected to the e-bike. In the unlocked state, the battery pack is detached from the e-bike.

[0055] Tool-free, as defined in the application, means that the portable fastening module can be switched between the locked and unlocked states without tools, i.e., for example, without a FAZ-081-PCT 13 23.01.2026

[0056] Screwdriver or wrench. The connection between the portable mounting module and the e-bike is therefore made without screws or rivets. Switching between the locked and unlocked states can preferably be done manually, by pushing a button, and / or by operating a lever mechanism. Preferably, the portable mounting module is designed such that switching can be effected by a pulling force, in particular via a pull strap.

[0057] In another embodiment of the e-bike battery system, it is characterized by the fact that the transportable mounting module has a mechanical connection unit for a detachable, form-fitting connection with the e-bike according to the transportable battery configuration.

[0058] In particular, the connecting unit has a snap-hook connection, the snap-hook connection preferably being spring-loaded. The connecting unit preferably includes a spring mechanism by which the connecting unit is biased towards a closed state.

[0059] Preferably, the connecting unit can be brought into an open state via a mechanical, and in particular manually operated, release unit. A pull loop can be used to actuate the release unit.

[0060] In another embodiment of the e-bike battery system, it is characterized in that the fixed mounting module is permanently and securely connected to the e-bike, in particular to a frame of the e-bike, by means of at least one screw connection.

[0061] It is also conceivable that the fixed mounting module is designed as part of the frame, in particular as an integral part of the frame.

[0062] In another embodiment of the e-bike battery system, it is characterized by the fact that:

[0063] a) the fixed mounting module has an electrical e-bike interface for electrical connection to the e-bike according to the fixed battery configuration, as well as an electrical battery pack interface for electrical connection of the battery pack to the electrical e-bike interface, and that the transportable mounting module has an electrical e-bike interface for electrical connection to the e-bike according to the transportable battery configuration, as well as a FAZ-081-PCT 14 23.01.2026

[0064] electrical battery pack interface for electrically connecting the battery pack to the electrical e-bike interface,

[0065] or

[0066] b) the battery pack has an electrical e-bike interface for electrically connecting the battery pack to the e-bike according to the fixed battery configuration and for alternatively electrically connecting the battery pack to the e-bike according to the transportable battery configuration.

[0067] In the embodiment according to point a), the electrical connection between the battery pack and the e-bike is made via the mounting modules. For this purpose, each mounting module has an interface between the mounting module and the e-bike (electrical e-bike interface) and an interface between the mounting module and the battery pack (electrical battery pack interface). The battery pack and the e-bike have corresponding interfaces for electrical connection to the respective mounting modules.

[0068] Since the transportable mounting module can be detached from the e-bike along with the battery pack, the electrical e-bike interface of the transportable mounting module is also designed to be detachable. Specifically, the electrical e-bike interface of the transportable mounting module includes a plug connection for electrical connection to the e-bike according to the transportable battery configuration.

[0069] The electrical e-bike interface of the fixed mounting module can also be designed to be detachable. Specifically, the electrical e-bike interface of the fixed mounting module includes a plug connection for electrical connection to the e-bike according to the fixed battery configuration. Alternatively, the electrical e-bike interface of the fixed mounting module can include a connection cable for electrical connection to the e-bike according to the fixed battery configuration. Preferably, the connection cable can be permanently attached to the e-bike.

[0070] The electrical battery pack interface of the fixed mounting module and / or the transportable mounting module is preferably designed to be detachable, but can alternatively also be designed to be permanently fixed to the battery pack.

[0071] In the embodiment according to point b), the electrical connection between the battery pack and the e-bike is direct, i.e., not via the mounting modules. Therefore, in this variant, the battery pack itself has the electrical e-bike interface. FAZ-081-PCT 15 23.01.2026

[0072] Since the battery pack is designed to be detachable from the e-bike in the transportable state of the e-bike battery system, the electrical e-bike interface of the battery pack is preferably also designed to be detachable. In particular, the electrical e-bike interface of the battery pack includes a plug connection for electrical connection to the e-bike according to the transportable battery configuration.

[0073] In a further embodiment of the e-bike battery system, it is characterized in that the e-bike battery system comprises at least two fixed mounting modules and at least two transportable mounting modules, and the battery pack comprises at least two module interfaces, wherein in the fixed state the two fixed mounting modules are each connected to one of the two module interfaces, and wherein in the transportable state the two transportable mounting modules are each connected to one of the two module interfaces.Furthermore, it can be provided that either on one side of the battery pack (or on both) the fixed mounting module and the transportable mounting module are identically designed, whereby the permanent connection in the fixed state differs from the detachable connection in that the corresponding mounting module, i.e., the fixed mounting module, is provided with at least one additional permanent fastening element, compared to the configuration in the transportable state, where this at least one additional permanent fastening element is omitted. This allows the modularity to be further increased, thereby improving flexibility.The manufacturing effort required to provide different configurations for e-bikes is also significant, as in this embodiment, for example, despite providing two mounting modules (one on each side), it is not necessary to produce four different mounting modules. Instead, the fixed mounting module on the underside and the transportable mounting module can be identical, only permanently attached to the battery pack via additional fasteners in the fixed configuration. An embodiment is also conceivable that thus manages with only a single type of mounting module, for example, by providing a mounting module only on one side of the battery pack. This mounting module is designed identically in both the fixed and transportable configurations and is attached to the battery pack using only different additional fasteners (at least in the case of the fixed mounting module).

[0074] The features of the previously described fixed mounting module, transportable mounting module, and module interface are also transferable to the second fixed mounting module, the second transportable mounting module, and the second module interface. FAZ-081-PCT 16 23.01.2026

[0075] The two fixed mounting modules can be identical, but they can also be different and, for example, exhibit a different selection of the features of the fixed mounting module described in this application. The same applies analogously to the transportable mounting modules, namely that the two transportable mounting modules can be identical, but they can also be different and, for example, exhibit a different selection of the features of the transportable mounting module described in this application.

[0076] In the fixed state, both fixed mounting modules are connected to the battery pack via one of their respective module interfaces. In the transportable state, both transportable mounting modules are connected to the battery pack via one of their respective module interfaces, at least when the battery pack is attached to the e-bike. It is conceivable that even when the battery pack is removed, both transportable mounting modules remain connected to the battery pack via their respective module interfaces, or perhaps only one of them is connected, while the other remains attached to the e-bike frame after removal. Alternatively, it is possible that only the battery pack with its two module interfaces is removed. In this case, which two module interfaces can be connected to the transportable mounting modules remaining on the frame without tools?

[0077] The two module interfaces are preferably arranged opposite each other on the battery pack. In particular, the battery pack has an elongated shape with two opposite ends, with one module interface located at one end and the other module interface at the other end.

[0078] In another embodiment of the e-bike battery system, it is characterized by the fact that the battery pack includes a housing for receiving battery cells, and the module interface or the at least two module interfaces are integrated into the housing.

[0079] The mechanical e-bike interface is preferably also integrated into the housing of the battery pack.

[0080] The invention relates not only to the e-bike battery system but also to an e-bike according to a fixed battery configuration with a battery pack permanently installed in the e-bike, which e-bike is characterized by the fact that the battery pack has a module interface for connecting to a fixed mounting module and for alternatively connecting to FAZ-081-PCT 17 23.01.2026

[0081] a different mounting module, in particular a transportable mounting module, wherein the fixed mounting module is connected to the battery pack via the module interface, and the battery pack is permanently fixed to the e-bike or is installed on / in the e-bike using the fixed mounting module.

[0082] The battery pack is preferably arranged within a contour of a down tube of an e-bike frame according to the fixed battery configuration, in particular within the down tube.

[0083] The invention also relates to an e-bike according to a transportable battery configuration with a battery pack detachably connected to the e-bike, which e-bike is characterized in that the battery pack has a module interface for connecting to a transportable mounting module and for alternatively connecting to another mounting module, in particular a fixed mounting module, wherein the transportable mounting module is connected to the battery pack via the module interface, and the transportable mounting module is detachably connected to the e-bike for repeated connection and detachment of the battery pack.

[0084] The battery pack is preferably arranged within a contour of a down tube of an e-bike frame according to the transportable battery configuration, in particular within the down tube.

[0085] The e-bike preferably has corresponding features that interact with the transportable mounting module in such a way that a detachable connection can be formed between the transportable mounting module and the e-bike. For example, the e-bike may preferably have recesses into which snap hooks of the transportable mounting module can engage.

[0086] The invention also relates to a method for equipping an e-bike with a battery pack, wherein the method comprises the following process step:

[0087] a) Providing a battery pack, wherein the battery pack has a module interface for connecting to a fixed mounting module and alternatively for connecting to a portable mounting module;

[0088] and either process step bl) or process step b2) includes:

[0089] bl) Connecting the module interface to the fixed mounting module, and permanently connecting the fixed mounting module to an e-bike according to a fixed battery configuration; FAZ-081-PCT 18 23.01.2026

[0090] b2) Connecting the module interface to the transportable mounting module, and detachably connecting the transportable mounting module to an e-bike according to a transportable battery configuration.

[0091] In one embodiment of the method, in step bl) the fixed mounting module is permanently connected to the e-bike before the battery pack is connected to the fixed mounting module. Alternatively, the fixed mounting module is permanently connected to the e-bike after the battery pack is connected to the fixed mounting module.

[0092] It can be advantageous if, in process step bl), the battery pack is connected to the e-bike using two fixed mounting modules. In this case, one of the fixed mounting modules is connected to the battery pack and then permanently attached to the e-bike, followed by the second fixed mounting module being connected to the battery pack. The second fixed mounting module can be permanently attached to the e-bike either before or after the connection to the battery pack.

[0093] It can be advantageous if, in process step b2), a mechanical e-bike interface is used in addition to the portable mounting module to connect the battery pack to the e-bike. In this case, the battery pack includes the mechanical e-bike interface. Preferably, the mechanical e-bike interface is first connected to the e-bike, followed by the portable mounting module.

[0094] Preferably, the fixed mounting module and / or the transportable mounting module is permanently connected to the module interface.

[0095] Preferably, in process step bl), the battery pack is inserted through an opening in the frame of the e-bike, in particular in a down tube of the frame. The opening is preferably located in a bottom bracket area of ​​the e-bike. The opening can preferably be located at a lower end of the down tube, wherein the lower end of the down tube adjoins a bottom bracket area of ​​the e-bike, and an upper end of the down tube adjoins a head tube area of ​​the e-bike.

[0096] In a preferred embodiment of the method for equipping an e-bike with a battery pack, the method comprises a two-stepped mechanism for mounting and / or dismounting the battery pack as described in FAZ-081-PCT 19 23.01.2026.

[0097] Portable battery configuration. When connecting the battery pack to the e-bike, it is first attached to a portable mounting module on the underside and then pivoted into its final mounting position (preferably with positive-locking connections between recesses and projections on the underside, as well as an electrical connector). When removing the battery pack, pulling a pull strap releases a locking mechanism, preferably on the top of the battery pack, and simultaneously assists in pivoting the battery pack, thereby preferably releasing the battery pack from engagement with at least one positive-locking connection and an electrical connector on the underside.

[0098] In a further preferred embodiment of the method, the transportable mounting module remains attached to the e-bike when the battery pack with its module interface(s) is removed. The method specifically provides that the battery pack can be removed and reinstalled without having to remove the transportable mounting module from the e-bike. This results in advantageous modularity and flexibility of the system and a slim, removable battery pack.

[0099] The invention further relates to a battery pack for an e-bike, wherein the e-bike is preferably either a fixed-battery e-bike or a portable-battery e-bike. The proposed battery pack is preferably designed for use in a proposed modular e-bike battery system as described above or below, or more preferably for installation in a proposed e-bike as described above or below, or more preferably for use in a proposed method for equipping an e-bike with a battery pack as described above or below.

[0100] The proposed battery pack has several battery cells, which are arranged in a housing of the battery pack, and the battery pack also has a module interface.

[0101] According to one initial proposal, the battery pack fulfills the following condition:

[0102] i) The battery pack can be placed in a fixed state by connecting the module interface to a fixed mounting module or FAZ-081-PCT 20 23.01.2026

[0103] connected, with the fixed mounting module being set up for permanently fixed installation of the battery pack on or in an e-bike according to a fixed battery configuration.

[0104] According to a second variant, the battery pack fulfills the following proposed condition:

[0105] ii) The battery pack is put into a transportable state by making the module interface connectable to a transportable mounting module, wherein the transportable mounting module is configured for repeated connection and disconnection of the battery pack to an e-bike according to a transportable battery configuration.

[0106] According to a particular embodiment, the proposed battery pack can also fulfill both of the aforementioned conditions, whereby the battery pack cannot, of course, be in both of the aforementioned states - fixed state and transportable state - simultaneously, but rather can be in both states.

[0107] However, it is always advantageous to have the same battery pack with battery cells, housing and module interface (or module interfaces) available and used to be installed on different types of e-bikes via an additional interface.

[0108] According to a particular embodiment, the battery pack, including the connected fixed mounting module(s), can have a shorter overall length than the battery pack, including the connected portable mounting module(s). However, an alternative embodiment could provide for the overall length to be the same in both embodiments.

[0109] The present invention is explained in detail below with reference to exemplary embodiments and the accompanying figures. These show:

[0110] Figure la shows an e-bike battery system with a fixed mounting module and a portable mounting module,

[0111] Figure 1b shows the e-bike battery system from Figure 1a in a fixed state for permanent fixed connection to an e-bike, FAZ-081-PCT 21 23.01.2026

[0112] Figure 1c shows the e-bike battery system from Fig. 1a in a transportable state for detachable connection with an e-bike,

[0113] Figure 2 shows another e-bike battery system with an alternative electric e-bike interface,

[0114] Figure 3 shows another e-bike battery system with two fixed mounting modules and two portable mounting modules.

[0115] Figure 3a shows another e-bike battery system with an alternative electric e-bike interface,

[0116] Figure 4 shows another e-bike battery system with a fixed mounting module, a portable mounting module, and a mechanical e-bike interface.

[0117] Figure 5 shows a further embodiment of a modular e-bike battery system, with a partial view of an e-bike frame according to a transportable battery configuration, in view a) a perspective view from below of the opening in the frame with a detachably mounted battery pack, in view b) a perspective view of the top of the battery pack, and in view c) a perspective view of the bottom of the battery pack.

[0118] Figure 6 shows the embodiment of the e-bike battery system from Figure 5, now connected only to an e-bike frame according to a fixed-battery configuration, in view a) a perspective view from below of the battery pack mounted in the frame (shown transparently and partially), in view b) a perspective view of the top of the battery pack, and in view c) a perspective view of the bottom of the battery pack.

[0119] Figure 7 shows a perspective view from above of the top of the battery pack with module interface according to the embodiment of the modular e-bike battery system from Figures 5 and 6.

[0120] Figure 8 shows a perspective view from below of the underside of the battery pack with module interface according to the exemplary embodiment of the modular e-bike FAZ-081-PCT 22 23.01.2026

[0121] Battery system from Figures 5 and 6, wherein the lower mounting module is additionally shown spaced apart in an exploded view,

[0122] Figure 9 shows the lower mounting module according to the exemplary embodiment of the modular e-bike battery system from Figures 5 and 6 and from Figure 8 in a perspective view from the front and top.

[0123] Figure 10 shows a perspective view from below of the underside of the battery pack with module interface according to the embodiment of the modular e-bike battery system from Figures 5 and 6, and

[0124] Figure 11 shows a perspective view from below of the underside of the bottom fixed mounting module in a fixed battery configuration as in Figure 6.

[0125] In the figures, unless otherwise indicated, identical reference symbols denote identical or corresponding components with the same function.

[0126] Figure 1a shows an e-bike battery system 1 with a fixed mounting module 6 and a transportable mounting module 7. Figure 1b shows the e-bike battery system 1 from Figure 1a in a fixed state for permanent connection to an e-bike, and Figure 1c shows the e-bike battery system 1 from Figure 1a in a transportable state for detachable attachment to an e-bike.

[0127] The battery pack 2 has a housing 12 in which a plurality of (not shown) battery cells and a (not shown) battery management system (BMS) are arranged.

[0128] The e-bike battery system 1 has a modular design. This means that the battery pack 2 can be connected via a module interface 3 either to the fixed battery module 6 or alternatively to the portable mounting module 7.

[0129] The connection between the mounting modules 6 and 7 and the module interface 3 is made via two screw connections 8, which are only indicated by the dashed lines shown. Specifically, the module interface 3 can have threads so that the mounting modules 6 and 7 can be connected to the module interface 3 by means of screws. The module interface 3 is integrated into the housing 12 of the battery pack 2; that is, the housing 12 forms the module interface 3. FAZ-081-PCT 23 23.01.2026

[0130] The electrical connection between battery pack 2 and the e-bike is made via mounting modules 6 and 7. The fixed mounting module 6 has an electrical e-bike interface 5 for electrical connection to the e-bike, as well as an electrical battery pack interface 9 for electrical connection of battery pack 2 to the fixed mounting module 6 or to the electrical e-bike interface 5 of the fixed mounting module 6. Similarly, the portable mounting module 7 has an electrical e-bike interface 5 for electrical connection to the e-bike, as well as an electrical battery pack interface 9 for electrical connection of battery pack 2 to the portable mounting module 7 or to the electrical e-bike interface 5 of the portable mounting module 7.

[0131] Since the transportable mounting module 7 can be detached from the e-bike together with the battery pack 2, the electrical e-bike interface 5 of the transportable mounting module 7 is also designed to be detachable. In this case, the electrical e-bike interface 5 of the transportable mounting module 7 includes a connector 10 for electrical connection to the e-bike. Part of the connector 10, for example the plug, is permanently connected to the e-bike.

[0132] The electrical e-bike interface 5 of the fixed mounting module 6 has a connection cable 11 for electrical connection to the e-bike. The connection cable 11 can be permanently connected to the e-bike.

[0133] In the fixed state of the e-bike battery system 1 as shown in Figure 1b, the fixed mounting module 6 is connected to the battery pack 2 via the module interface 3. In this state, the battery pack 2 can be permanently and securely connected to the e-bike via the fixed mounting module 6. A seal 14 is arranged between the fixed mounting module 6 and the module interface 3, sealing a contact surface between the fixed mounting module 6 and the module interface 3. The electrical battery pack interface 9 is located in this contact area and is protected from external influences such as water and dirt by the seal 14.

[0134] In the transportable state of the e-bike battery system 1 according to Figure 1c, the transportable mounting module 7 is connected to the battery pack 2 via the module interface 3. In this state, the battery pack 2 can be detachably connected to the e-bike via the transportable mounting module 7. A seal 14 is arranged between the transportable mounting module 7 and the module interface 3. FAZ-081-PCT 24 23.01.2026

[0135] A contact surface between the transportable mounting module 7 and the module interface 3 is sealed. The electrical battery pack interface 9 is located in the contact area and is protected from external influences such as water and contamination by the seal 14.

[0136] Figure 2 shows another e-bike battery system 1 with a fixed mounting module 6 and a portable mounting module 7. In contrast to the e-bike battery system 1 from Figures 1a to 1c, the e-bike battery system 1 from Figure 2 has an alternative electrical e-bike interface 5 on the battery pack 2 and is otherwise constructed the same.

[0137] The electrical e-bike interface 5 has a plug connection 10, so that the electrical e-bike interface 5 can also be detached from the e-bike in the transportable state of the e-bike battery system 1.

[0138] The electric e-bike interface 5 is located on a side surface of the battery pack 2, while the module interface 3 is located on an end surface of the battery pack 2.

[0139] Figure 3 shows another e-bike battery system 1 with two fixed mounting modules 6 and two transportable mounting modules 7, as well as two module interfaces 3. The two module interfaces 3 are arranged at opposite ends or opposite front faces of the battery pack 2.

[0140] The module interfaces 3 and the associated mounting modules 6 and 7 are constructed analogously to each other.

[0141] Figure 3a shows the e-bike battery system 1 from Figure 3, but with an electrical e-bike interface 5, which is located in one of the module interfaces 3 arranged on the end face of the battery pack 2. Both the fixed mounting module 6 and the portable mounting module 7 have vias 13 for electrical contacting the electrical e-bike interface 5 and the connector of the plug connection 10. The vias 13 can, for example, be designed as simple metallic conductors embedded in the respective mounting module (6, 7), in particular cast in an injection molding process. The vias 13 can also be used analogously in the other embodiments with only one fixed mounting module 6 and only one portable mounting module 7. FAZ-081-PCT 25 23.01.2026

[0142] Figure 4 shows another e-bike battery system 1 with a fixed mounting module 6, a portable mounting module 7, and a mechanical e-bike interface 4. The mechanical e-bike interface 4 is designed for mechanically connecting the battery pack 2 to the e-bike. In addition to the mechanical connection using the fixed mounting module 6 or the portable mounting module 7, a further mechanical connection to the e-bike can be established using the mechanical e-bike interface 4. In this way, the battery pack 2 is mechanically connected to the e-bike at two significantly separated points, thus ensuring a stable hold of the battery pack 2 on the e-bike.

[0143] Both the mechanical e-bike interface 4 and the electrical e-bike interface 5 are arranged opposite the module interface 3 on the battery pack 2. The battery pack 2 has an elongated shape with two opposite ends, with the module interface 3 at one end and the mechanical e-bike interface 4 and the electrical e-bike interface 5 at the opposite end.

[0144] The mechanical e-bike interface 4 can be used both in an e-bike according to the fixed battery configuration to connect the battery pack 2 to the e-bike and with an e-bike according to the transportable battery configuration.

[0145] The mechanical e-bike interface 4 is designed for positive-locking connection to the e-bike according to the fixed battery configuration and for alternative positive-locking connection to the e-bike according to the portable battery configuration. For positive locking, the mechanical e-bike interface 4 includes a recess in the housing 12 of the battery pack 2. The recess tapers towards the interior of the battery pack 2 to enable a play-free connection to the e-bike. The e-bike (not shown) has a corresponding molded area that engages in the recess to connect the e-bike to the battery pack 2.

[0146] Figures 5 and 6 show a further concrete embodiment of a proposed e-bike battery system 1 and 20, respectively. Figure 5 shows an e-bike battery system 1, 20 comprising a removable battery pack 2 and 22, respectively, which is installed in a proposed e-bike according to a portable battery configuration. Figure 6 shows an e-bike battery system 1, 20 comprising a permanently fixed battery pack 2 and 22, respectively, which is installed in a proposed e-bike according to a fixed battery configuration. FAZ-081-PCT 26 23.01.2026

[0147] Figures 5 and 6 each show three views (a), b), and c), which are essentially identical in both Figures 5 and 6, respectively, of the removable battery system 1, 20 (three views of Figure 5) and the permanently installed battery system 1, 20 (three views of Figure 6). View a) of each figure shows a perspective view of a frame 80 of a proposed e-bike, depicted only schematically and in sections. In Figure 5, view a), the frame 80 is shown in perspective with a view of an opening 81 on its underside. Through this opening 81, a user of the e-bike can remove the removable battery pack 2, 22 (from its depicted installed state) or insert it into the opening 81 and reconnect it to the e-bike. In Figure 6, as can be seen in view a), the frame 80 does not have this opening.In view a) of Figure 6, the frame 80 is therefore only shown transparently or indicated, so that the interior 82 of the frame 80 is visible. The battery pack 2, 22 is fixedly mounted in this interior 82 of the frame 80 and cannot be removed without tools, so that the battery pack 2, 22 remains on the corresponding e-bike according to the fixed battery configuration of the e-bike battery system 1, 20 shown in Figure 6.

[0148] The views b) of the two figures 5 and 6 then show an enlarged section of the top surface 40 of the respective battery pack 2, 22, namely in figure 5, view b), with a transportable mounting module 7 or 27 or 47 connected to the module interface 3 or 23 or 43 arranged on the top surface 40, while in figure 6, view b), a fixed mounting module 6 or 26 or 46 connected to the module interface 3 or 23 or 43 arranged on the top surface 40 can be seen. While the transportable mounting module 7, 27, 47 and the fixed mounting module 6, 26, 46 arranged on the upper side 40 are each designed differently, the module interface 3, 23, 43 arranged on the upper side 40 is the same for the otherwise identically designed housing 12.32 having the same battery cells (not shown) and the same BMS (not shown) in this housing 12, 32, battery pack 2, 22 having the same for both states recognizable in Figure 5 and Figure 6, i.e. the fixed state and the transportable state of the e-bike battery system 1, 20.

[0149] The corresponding top-side module interface 3, 23, 43 can again be seen in Figure 7, which shows the battery pack 2, 22 with housing 12, 32 in a partial perspective view of the top surface 40 and the end surface 42 of the battery pack 2, 22 or its housing 12, 32. The top-side module FAZ-081-PCT 27 23.01.2026

[0150] Interface 3, 23, 43 is formed by at least one bore 41, in the specific embodiment by two bores 41, in the housing 2, 32. Through the bores 41, the transportable mounting module 7, 27, 47 is connected to the module interface 3, 23, 43 and thus to the battery pack 2, 32 by means of the two housing screws 44 in the transportable state according to Figure 5, and the fixed mounting module 6, 26, 46 is connected to the module interface 3, 23, 43 and thus to the battery pack 2, 32 by means of the two housing screws 48 in the fixed state according to Figure 6. The holes 41 can therefore be used to optionally connect either the transportable mounting module 7, 27, 47 (using housing screws 44) or the fixed mounting module 6, 26, 46 (using housing screws 48) to the battery pack 2, 22.The same top-side module interface 3, 23, 43 serves to connect, on the one hand, the top-side transportable mounting module 7, 27, 47 according to Figure 5 (see in particular view b)) and, on the other hand, the top-side fixed mounting module 6, 26, 46 according to Figure 6 (see in particular view b)).

[0151] The two pairs of housing screws 44 and 48 differ, due to the fact that the same bores 41 and corresponding threads are used, only in their length, since in the specific embodiment the upper transportable mounting module 7, 27, 47 has a greater vertical height (viewed along the battery axis) than the upper fixed mounting module 6, 26, 46.

[0152] Furthermore, in the respective views a) of Figures 5 and 6, two pairs of frame screws 83 and 84 can be seen: in Figure 5 and Figure 6, two upper frame screws 83, and in Figure 5 and Figure 6, two lower frame screws 84. These frame screws 83 and 84 ultimately ensure the connection of the respective e-bike battery system 1, 20 to the frame 80 and thus to the e-bike, once in the fixed state and once in the transportable state.

[0153] The battery pack 2, 22, as shown in Figure 5, must of course remain easily detachable and removable from the frame 80 and e-bike by the user without tools, i.e., without having to loosen the frame screws 83, 84. The frame screws 83, as shown in Figure 5, therefore only serve to securely attach a frame-side component, which is only minimally visible in view a) of Figure 5 and is not described in further detail. This frame-side component, in turn, serves to interact with the upper transportable mounting module 7, 27, 47 of the battery pack 2, 22. FAZ-081-PCT 28 23.01.2026

[0154] To enable tool-free removal of the battery pack 2, 32 in accordance with the transportable state of the e-bike battery system 1, 20, the transportable mounting module 7, 27, 47 can be manually switched or moved from a locked state to an unlocked state by a user without tools. This can be done, as can be seen in view a) of Figure 5, and partly also in view b), via a pull strap 90, which pull strap 90 is coupled to a locking mechanism (e.g., a spring-loaded snap hook) not shown. By pulling on the pull strap 90, the locking mechanism can be moved into an unlocked state, so that the battery pack 2, 22 is no longer locked to the frame 80 or the corresponding frame-side component (fixed to the frame via the frame screws 83) and the battery pack 2, 22 can be removed from the frame 80 by pivoting the battery pack 2, 22 out of the opening 81.The swiveling action is assisted by the user pulling the pull strap 80 and also by the provision of a pivot point on the underside 50. This pivot point is achieved by creating a partial gap 58 between the end surface 52 of the underside 50 and the adjacent frame-side component (the transportable mounting module 7, 27, 57). This gap arises because the end surface 52 of the underside 50 of the battery pack 2, 22 does not fully rest on the corresponding top surface 61 of the transportable mounting module 7, 27, 57 on the underside, but rather the latter has a chamfer.

[0155] In the locked state, the battery pack 2, 22 – also in the described transportable state of the e-bike battery system 1, 20 – is mechanically fixed to the frame 80, at least indirectly. In the unlocked state, the battery pack 2, 22 can be detached from the e-bike. The connection between the upper transportable mounting module 7, 27, 47 mounted on the battery pack 2, 22 and the frame 80 is screwless and rivetless. Specifically, there is a positive-locking and force-locking connection, which can be released without tools by simply pulling the pull strap 90 by hand. The pull strap 90 thus constitutes a mechanical and manually operated release unit, which is responsible for unlocking the connection. For this purpose, the transportable mounting module 7, 27, 47 has a mechanical connection unit, not shown in further detail, for a detachable form-fitting connection with the e-bike according to the transportable battery configuration.This connecting unit can have a snap-hook connection, which can be advantageously spring-loaded. The connecting unit can, in particular, have a spring mechanism by which the connecting unit is biased towards a closed state. Then, as FAZ-081-PCT 29 23.01.2026.

[0156] The connecting unit is described as being brought into an open state via the mechanical and manually operated release unit in the form of the pull strap 90.

[0157] The described connection, which is fundamentally detachable yet nevertheless secure, at least of a form-fit nature, is also present on the underside 50 of the battery pack 2, 22, as can be seen in conjunction with view c) of Figure 5 in conjunction with Figures 8, 9, and 10. View c) of Figure 5 shows a partial view of the battery pack 2, 22 from the side, in a slightly perspective view of the underside 50. The transportable mounting module 7, 27, 57, which adjoins the underside of the battery pack 2, 22, is also visible. As already mentioned, due to the range of motion 58 on the underside 50, the battery pack 2, 22 can be pivoted around the front corner, thus allowing its removal. Figure 8 also shows, in part, the underside 50 of the battery pack 2, 22, whereby the view of the end surface 52 on the underside 50 is exposed, since the mounted orFigure 9 shows the battery pack 2, 22 inserted into frame 80 in a kind of exploded view, with the transportable mounting module 7, 27, 57 directly below and spaced apart from the underside 50. Figure 9 then shows a perspective view from the front and slightly from above of the top surface 61 of the underside transportable mounting module 7, 27, 57, which is fundamentally identical in construction to the underside fixed mounting module 6, 26, 56. Therefore, the following text often refers to a “lower mounting module 7, 27, 57 or 6, 26, 56” in abbreviated form, when it is not important to distinguish whether the battery pack 2, 22 is permanently mounted according to the Fixed state or is removable according to the Transportable state.Figure 10, similar to Figure 8, also shows the underside 50 of the battery pack 2, 22, but without a separate underside mounting module 7, 27, 57 or 6, 26, 56. In Figure 8, the exploded view reveals the underside module interface 3, 23, 53 of the battery pack 2, 22, as in Figure 10. The explanation of this module interface 3, 23, 53 and its interaction with the mounting modules 7, 27, 57 or 6, 26, 56 illustrates the permanent or detachable connection of the battery pack 2, 22 to the frame 80 or the e-bike.

[0158] The lower module interface 3, 23, 53 comprises several wedge-shaped recesses 51 that interact with corresponding wedge-shaped projections 63 of the lower mounting module 7, 27, 57 or 6, 26, 56. This positive locking connection results in a locking in at least two translational degrees of freedom. Therefore, the lower module interface 3, 23, 53 with its recesses can also fulfill the function of the mechanical e-bike interface 4, as per FAZ-081-PCT 30 23.01.2026.

[0159] The projections 63 corresponding to this mechanical e-bike interface 4 with its recesses 51 then function as molded parts of the e-bike, in that those projections 63 which are provided on the lower mounting module 7, 27, 57 or 6, 26, 56 are also fundamentally and permanently connected to the e-bike via the basic connection of the lower mounting module 7, 27, 57 or 6, 26, 56 with the e-bike.

[0160] Additionally, electrical interfaces and connections are provided on the underside 50 of the battery pack 2, 22. The underside 50 itself, i.e., the underside module interface 3, 23, 53, has a connector receptacle 55. The electrical energy from the battery cells, as well as a communication connection, for example to the BMS located inside the battery pack 2, 22, can be output via the corresponding connector and ultimately forwarded, for example, to the drive system of the e-bike. The corresponding plug connection is realized by inserting a plug 65 on the top side 61 of the bottom mounting module 7, 27, 57 or 6, 26, 56 into the plug receptacle 55 when connecting this mounting module 7, 27, 57 or 6, 26, 56 to the battery pack 2, 22 (i.e., for example, also when inserting the removable battery pack 2, 22 in the portable battery configuration) (see figure).Figure 9 in conjunction with Figure 8 or Figure 10). On the underside of the lower mounting module 7, 27, 57 or 6, 26, 56, opposite the upper side 61, a connector 75 is also arranged, which then serves to form a plug connection with a connector receptacle (not shown) in the frame 80 of the e-bike and thus ultimately for the electrical connection with the e-bike itself. In this respect, the upper connector 65 of the mounting module 7, 27, 57 or 6, 26, 56 can also be referred to as the electrical battery pack interface 9, while the lower connector 75 forms the electrical e-bike interface 5.

[0161] Thus, the underside 50 of battery pack 2, 22 features an electrical connector that serves as a pluggable electrical battery pack interface in both the fixed and transportable states. Battery pack 2, 22 remains fundamentally unchanged in both configurations (fixed and transportable) and always has the same mechanical and electrical interfaces. Switching between the two states is accomplished solely by attaching or removing the respective mounting modules and / or inserting or removing screws. Specifically, as mentioned, the underside mounting module 7, 27, 57 or 6, 26, 56 does not even need to be replaced to change between the fixed and transportable states. FAZ-081-PCT 31 23.01.2026

[0162] In the fixed state, the lower mounting module 6, 26, 56, i.e., the lower fixed mounting module 6, 26, 56, is firmly connected to the battery pack 2, 22 by means of two housing screws 68. This is the only difference on the underside 50 with regard to the connection of the fixed mounting module 6, 26, 56, compared to the transportable state, in which the lower transportable mounting module 7, 27, 57 is not screwed to the battery pack 2, 22, but interacts with the battery pack 2, 22 only via the described positive locking connection (recesses 51 / projections 63) and the electrical plug connection with the plug 65 inserted into the plug receptacle 55. Figure 11 shows the firmly screwed connection of the lower fixed mounting module 6, 26, 56 and also the firmly screwed connection to the frame 80 via the frame screws 84.The screw connection of the lower fixed mounting module 6, 26, 56 to the battery pack 2, 22 is also clearly visible in view c) of Figure 6. In conjunction with view c) of Figure 5, it becomes clear once again that the lower transportable mounting module 7, 27, 57 is designed identically to the lower fixed mounting module 6, 26, 56, or rather, that the same mounting module can be used, since only the two housing screws 68 need to be omitted to switch between the fixed state on the underside 50 of the battery pack 2, 22 and the transportable state. This underscores the modularity and interchangeability of the proposed system.

[0163] Figures 8, 9, and 10 further illustrate the central idea of ​​the system: One and the same battery pack 2, 22 can be used in both a fixed and a transportable configuration, with the mechanical and electrical interfaces of the battery pack remaining unchanged and the conversion being achieved solely by replacing or omitting the mounting modules and / or screws. Tool-free removal in the transportable state is enabled by the pull strap 90, while in the fixed state, a permanent screw connection ensures secure mounting. FAZ-081-PCT 32 23.01.2026

[0164] Reference symbol

[0165] 1; 20 E-bike battery system 75 connectors

[0166] 2; 22 Battery pack 80 Frame (of an e-bike) 3; 23; 43; 53 Module interface 81 Opening

[0167] 4 mechanical e-bike - 82 interior interface 83, 84 frame screws 5 electric e-bike - 90 pull strap interface

[0168] 6; 26; 46; 56 Fixed mounting module

[0169] 7; 27; 47; 57 Portable mounting module

[0170] 8 screw connection

[0171] 9 electrical battery pack interface

[0172] 10 connectors

[0173] 11 connection cables

[0174] 12; 32 Housing

[0175] 13 vias

[0176] 14 Seal

[0177] 40 Top

[0178] 41 bore

[0179] 42 End surface

[0180] 44, 48 Housing screws

[0181] 50 bottom

[0182] 51 Exclusion

[0183] 52 End surface

[0184] 54 bore

[0185] 55 Plug socket

[0186] 58 Range of motion

[0187] 61 Top side (of the bottom-mounted transportable mounting module)

[0188] 62 Bevel

[0189] 63 protrusions

[0190] 64 bore

[0191] 65 plugs

[0192] 68 housing screws

Claims

FAZ-081-PCT 1 23.01.2026 Patent claims 1. Modular e-bike battery system (1; 20), comprising a battery pack (2; 22), a fixed mounting module (6; 26; 46; 56) and a Portable mounting module (7; 27; 47; 57), wherein the battery pack (2) has a module interface (3; 23; 43; 53) for connecting to the Fixed mounting module (6; 26; 46; 56) and for alternative connection with the Transportable mounting module (7; 27; 47; 57), wherein, in a fixed state of the e-bike battery system (1; 20), the The fixed mounting module (6; 26; 46; 56) is connected to the battery pack (2; 20) via the module interface (3; 23; 43; 53), wherein the Fixed mounting module (6; 26; 46; 56) for permanently fixed installation of the battery pack (2; 20) on or in an e-bike according to a Fixed battery configuration is set up, and wherein, in a transportable state of the e-bike battery system (1; 20), the transportable mounting module (7; 27; 47; 57) is connected to the battery pack (2; 20) via the module interface (3; 23; 43; 53), the transportable mounting module (7; 27; 47; 57) is configured to repeatedly connect and disconnect the battery pack (2; 20) to an e-bike according to a transportable battery configuration.

2. Modular e-bike battery system (1; 20) according to the preceding claim, wherein the fixed mounting module (6; 26; 46; 56) and the The transportable mounting module (7; 27; 47; 57) are of identical design; wherein, preferably, the fixed mounting module (6; 26; 46; 56) and the transportable mounting module (7; 27; 47; 57) are connected or connectable to the underside of the battery pack (2; 20); and / or wherein, preferably, the distinction between Fixed state and transportable state are achieved by providing at least one additional connecting means, in particular in the form of at least one housing screw (68) connecting the fixed mounting module (6; 26; 46; 56) to the battery pack (2; 22) in the fixed state.

3. Modular e-bike battery system (1; 20) according to one of the preceding claims, wherein the transportable mounting module (7; 27; 47; 57) or at least one of the transportable mounting modules (7; 27; 47; 57) is arranged to remain on the e-bike, in particular on the frame (80), even when the battery pack (2; 22) is connected with its module interface (3; 23; 43; 53) or with FAZ-081-PCT 2 23.01.2026 its module interfaces (3; 23; 43; 53) are taken from the e-bike (80) or are taken from it; wherein, preferably, the transportable mounting module (7; 27; 47; 57) or at least one of the transportable mounting modules (7; 27; 47; 57) is permanently connected to the frame (80).

4. Modular e-bike battery system (1; 20) according to one of the preceding claims, wherein at least one of the mounting modules of the Fixed mounting module (6; 26; 46; 56) and the The transportable mounting module (7; 27; 47; 57) is connected or connectable to the battery pack (2; 22) in at least one of the fixed state and transportable state states via at least one, preferably two, connecting means, in particular housing screw(s) (44; 48; 68), wherein, in particular, the connecting means is / are aligned approximately parallel to the battery pack axis; and / or wherein at least one, preferably all, of the fastening modules of the fixed fastening module (6; 26; 46; 56) and the The transportable mounting module (7; 27; 47; 57) is connected or connectable to the e-bike, preferably to the frame (80), in at least one of the fixed state and transportable state states, preferably in both states, via at least one, preferably two, connecting means, in particular frame screw(s) (83; 84), wherein, in particular, the connecting means is / are oriented approximately perpendicular to the battery pack axis.

5. Modular e-bike battery system (1; 20) according to one of the preceding claims, wherein in both states, in the fixed state and in the transportable state, the same battery pack (2; 22), in particular with the same battery cells and / or with the same housing (12; 32) and / or with the same module interface(s) (3; 23; 43; 53), is used; wherein, preferably, the battery pack (2; 22), in particular including its module interface(s) (3; 23; 43; 53), remains unchanged in both states.

6. Modular e-bike battery system (1; 20) according to one of the preceding claims, wherein at least one, preferably all, of the mounting modules of the fixed mounting module (6; 26; 46; 56) and the The transportable mounting module (7; 27; 47; 57) utilizes standardized attachment points on the battery pack (2; 22), wherein the attachment points are bores (41; 54), positive-locking recesses (51) FAZ-081-PCT 3 23.01.2026 and / or electrical plug connections (55; 65; 75) are formed; wherein, preferably, the different types of fastening modules of the fixed fastening module (6; 26; 46; 56) and the The portable mounting module (7; 27; 47; 57) uses the same attachment points.

7. Modular e-bike battery system (1; 20) according to one of the preceding claims, wherein the at least one, in particular the, attachment point(s) on the battery pack (2; 22) for the fixed mounting module (6; 26; 46; 56) and the transportable mounting module (7; 27; 47; 57), in particular on the top (40), are identical; wherein, preferably, the fastening modules are connected or connectable to the battery pack (2; 22) via the same bore(s) (41).

8. Modular e-bike battery system (1; 20) according to one of the preceding claims, wherein the lower fixed mounting module (6; 26; 56) and / or the lower transportable mounting module (7; 27; 57) has at least one, preferably at least two, preferably three, projection(s) (63) which projection(s) (63) preferably effect a positive locking connection between the battery pack (2; 22) and the lower fixed mounting module (6; 26; 56) and / or the lower transportable mounting module (7; 27; 57) in two axes; wherein, preferably, the locking in a third axis, in particular at least with respect to the lower fixed fastening module (6; 26; 56) in the fixed state, is effected by a further connecting means, in particular a housing screw (68).

9. Modular e-bike battery system (1; 20) according to one of the preceding claims, wherein the battery pack (2; 22) has a mechanical e-bike interface (4) for mechanically connecting the battery pack (2; 22) to the e-bike according to the fixed battery configuration and for alternatively mechanically connecting the battery pack (2; 22) to the e-bike according to the transportable battery configuration; wherein, preferably, the mechanical e-bike interface (4) for positive locking connection with the e-bike according to the Fixed battery configuration and is configured for alternative positive locking connection to the e-bike according to the transportable battery configuration; and / or wherein, preferably, the mechanical e-bike interface (4) is configured for positive locking connection to the e-bike according to FAZ-081-PCT 4 23.01.2026 Fixed battery configuration and for alternative form-fitting connection to the e-bike according to the transportable battery configuration, has a shaping, preferably a shaping that is at least partially wedge-shaped.

10. Modular e-bike battery system (1; 20) according to one of the preceding claims, wherein the fixed mounting module (6; 26; 46; 56) and the transportable mounting module (7; 27; 47; 57) are arranged to be connectable to the module interface (3; 23; 43; 53) by at least one screw connection (8) and / or a positive locking connection; and / or wherein the transportable mounting module (7; 27; 47; 57) is configured to be connectable to the e-bike by means of a positive and / or force-locking connection in accordance with the transportable battery configuration.

11. Modular e-bike battery system (1; 20) according to one of the preceding claims, wherein the transportable mounting module (7; 27; 47) is designed to be switchable between a locked state and an unlocked state without tools; and / or wherein the transportable mounting module (7; 27; 47; 57) has a mechanical connection unit for detachable positive locking connection with the e-bike according to the transportable battery configuration.

12. Modular e-bike battery system (1; 20) according to one of the preceding claims, wherein: the fixed mounting module (6; 26; 56) has an electrical E-bike interface (5) for electrical connection to the e-bike according to the fixed battery configuration, as well as an electrical Battery pack interface (9) for electrically connecting the battery pack (2; 22) to the electrical e-bike interface (5), and wherein the transportable mounting module (7; 27; 57) has an electrical e-bike interface (5) for electrically connecting to the e-bike according to the transportable battery configuration, as well as an electrical battery pack interface (9) for electrically connecting the battery pack (2; 22) to the electrical e-bike interface (5).

13. Modular e-bike battery system (1; 20) according to the preceding claim, wherein the electrical e-bike interface (5) of the Portable mounting module (7; 27; 57) a plug connection (10) for electrical connection to the e-bike according to the Portable battery configuration includes; and / or wherein the electric e-bike interface (5) of FAZ-081-PCT 5 23.01.2026 The fixed mounting module (6) includes a connection cable (11) for electrical connection to the e-bike according to the fixed battery configuration.

14. Modular e-bike battery system (1; 20) according to one of the preceding claims, wherein the e-bike battery system (1; 20) comprises at least two comprising fixed mounting modules (6; 26; 46; 56) and at least two transportable mounting modules (7; 27; 47; 57), and wherein the battery pack (2; 20) comprises at least two module interfaces (3; 23; 43; 53), wherein in the fixed state the two fixed mounting modules (6; 26; 46; 56) are each connected to one of the two module interfaces (3; 23; 43; 53), and wherein in the transportable state the two transportable mounting modules (7; 27; 47; 57) are each connected to one of the two module interfaces (3; 23; 43; 53); wherein, preferably, the at least two module interfaces (3; 23; 43; 53) are arranged opposite each other on the battery pack (2; 22).

15. E-bike according to a fixed battery configuration with a battery pack (2; 22) permanently installed in the e-bike, wherein the battery pack (2; 22) has a module interface (3; 23; 43; 53) for connecting to a Fixed mounting module (6; 26; 46; 56) and for alternative connection with another mounting module, wherein the fixed mounting module (6; 26; 46; 56) is connected to the battery pack (2; 22) via the module interface (3; 23; 43; 53), and wherein the battery pack (2; 22) is permanently fixed to the e-bike by means of the fixed mounting module (6; 26; 46; 56).

16. E-bike according to a transportable battery configuration with a battery pack (2; 22) detachably connected to the e-bike, wherein the battery pack (2; 22) has a module interface (3; 23; 43; 53) for connecting to a transportable mounting module (7; 27; 47; 57) and for alternatively connecting to another mounting module, wherein the The transportable mounting module (7; 27; 47; 57) is connected to the battery pack (2; 22) via the module interface (3; 23; 43; 53), and the transportable mounting module (7; 27; 47; 57) is detachably connected to the e-bike for repeated connection and detachment of the battery pack (2; 22).

17. Method for equipping an e-bike with a battery pack (2; 22), wherein the method comprises the following process steps: FAZ-081-PCT 6 23.01.2026 a) Providing a battery pack (2; 22), wherein the battery pack (2; 22) has a module interface (3; 23; 43; 53) for connecting to a Fixed mounting module (6; 26; 46; 56) and for alternative connection with a transportable mounting module (7; 27; 47; 57); and bl) Connecting the module interface (3; 23; 43; 53) to the fixed mounting module (6; 26; 46; 56), and permanently connecting the fixed mounting module (6; 26; 46; 56) to an e-bike according to a fixed battery configuration; or b2) Connecting the module interface (3; 23; 43; 53) to the transportable mounting module (7; 27; 47; 57), and detachably connecting the transportable mounting module (7; 27; 47; 57) to an e-bike according to a transportable battery configuration.

18. Method according to claim 17, wherein the method comprises a two-step mechanism for mounting and / or dismounting the battery pack (2; 22) in the transportable battery configuration, wherein the battery pack (2; 22) is first connected to a bottom-mounted transportable mounting module (7; 27; 57) when connecting to the e-bike and is then pivoted to enter the final mounting position; and / or wherein, when removing the battery pack (2; 22) by pulling on a pull strap (90), a locking mechanism, preferably on the top (40) of the battery pack (2; 22), is released and a pivoting of the battery pack (2; 22) is supported, whereby, preferably on the underside (50), the battery pack (2; 22) is released from engagement with at least one positive locking connecting element and an electrical plug connection.

19. Method according to one of claims 17 or 18, wherein the The portable mounting module (7; 27; 47; 57) remains mounted on the e-bike (80) when the battery pack (2; 22) is attached to its Module interface (3; 23; 43; 53) / with its module interfaces (3; 23; 43; 53) is taken from; and / or wherein the method involves removing and re-inserting the battery pack (2; 22) without having to remove the transportable mounting module (7; 27; 47; 57) from the e-bike (80).

20. Battery pack (2; 22) for an e-bike, preferably for use in a modular e-bike battery system (1; 20) according to one of claims 1 to 14 FAZ-081-PCT 7 23.01.2026 and / or for installation in an e-bike according to claim 15 or 16 and / or for use in a method according to one of claims 17 to 19, wherein the battery pack (2; 22) has several battery cells which are arranged in a housing (12; 32) of the battery pack (2; 22), wherein the battery pack (2; 22) further comprises a module interface (3; 23; 43; 53) and satisfies the following condition: i) the battery pack (2; 22) can be moved into a fixed state or offset by connecting the module interface (3; 23; 43; 53) with a Fixed mounting module (6; 26; 46; 56) is connectable or connected, wherein the fixed mounting module (6; 26; 46; 56) is designed for permanently fixed installation of the battery pack (2; 22) on or in an e-bike according to a fixed battery configuration; or ii) the battery pack (2; 22) is transferable into a transportable state or offset by the module interface (3; 23; 43; 53) being connectable or connected to a transportable mounting module (7; 27; 47; 57), wherein the transportable mounting module (7; 27; 47; 57) is configured for repeatedly connecting and disconnecting the battery pack (2; 22) to an e-bike according to a transportable battery configuration.

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