Battery system for bicycle

Abstract

The invention relates to a battery system for a bicycle. The battery system includes an auxiliary battery releasably coupled to the main battery. The main battery includes a charge controller and has a first output voltage. The main battery is configured to be electrically coupled to and supply power to a bicycle drive unit. The auxiliary battery has a second output voltage. The auxiliary battery is releasably coupled in series to the main battery such that a total output voltage of the main battery and the auxiliary battery equals a sum of the first output voltage and the second output voltage.

Description

Technical Field

[0001] The present application generally relates to a battery system for a bicycle including a battery system for powering a bicycle drive system and methods of assembling and using the battery system on a bicycle. Background Art

[0002] Electric-assist bicycles, or e-bikes, are typically powered by one or more batteries that may be relatively heavy and expensive. When taking short rides where the extra range is not needed, the rider unnecessarily consumes additional energy to transport the heavier batteries. While secondary battery packs can be used to extend the range of primary batteries, the secondary and primary battery packs are typically connected in parallel during discharge, which does not increase the overall voltage of the system. In other systems, the secondary battery can be used in isolation from the primary battery. Summary of the invention

[0003] In one aspect, an embodiment of a drive system for a bicycle includes a drive unit, a main battery, and an auxiliary battery. The main battery includes a charge controller and has a first output voltage. The main battery is configured to be electrically coupled to the drive unit and to supply power to the drive unit. The auxiliary battery has a second output voltage. The auxiliary battery is releasably coupled to the main battery in series such that a total output voltage of the main battery and the auxiliary battery is equal to a sum of the first output voltage and the second output voltage.

[0004] In another aspect, an embodiment of a battery system for a bicycle includes a main battery including a charge controller and having a first output voltage. An auxiliary battery has a second output voltage. The auxiliary battery is movable relative to the main battery between a first engaged configuration, in which the auxiliary battery is releasably coupled to the main battery in series such that the total output voltage of the main battery and the auxiliary battery is equal to the sum of the first output voltage and the second output voltage, and a first disengaged configuration, in which the auxiliary battery is separated from the main battery. The main battery may include a bicycle mounting device. The mounting device may be configured to mount the main battery to a bicycle frame and / or a bicycle drive unit.

[0005] In one embodiment, the storage container is movable relative to the main battery between an engaged configuration in which the storage container is releasably coupled to the main battery and a disengaged configuration in which the storage container is separated from the main battery.

[0006] In another aspect, an embodiment of a battery system for a bicycle includes a main battery with a charge controller. The main battery has a first output voltage and is configured to be electrically coupled to the drive unit and to supply power to the drive unit. An auxiliary battery has a second output voltage. The auxiliary battery is releasably coupled to the main battery in series so that the total output voltage of the main battery and the auxiliary battery is equal to the sum of the first output voltage and the second output voltage. A switch network is operably coupled to the main battery and the auxiliary battery, wherein the switch network is configured to connect the main battery and the auxiliary battery to a charging power source in parallel or in series.

[0007] Various embodiments of the battery system and drive system and methods of using and assembling the same have significant advantages over other battery systems, drive systems, bicycles, and methods. For example, but not limited to, the main battery can be configured as a lighter, smaller capacity battery for short rides where additional range is not required. The auxiliary battery can be used for longer rides that require additional battery capacity. The rider can meet the battery capacity needs for short and long rides by adding additional battery capacity without balancing the state of charge between the two battery packs or by limiting the additional capacity to a lower motor assist level.

[0008] Another advantage is that the auxiliary battery can be replaced with an accessory such as a storage container. This may be particularly advantageous on shorter rides (e.g., when commuting or running errands), where storage capacity may be more valuable.

[0009] The foregoing paragraphs are provided by way of general introduction and are not intended to limit the scope of the following claims. Various preferred embodiments and further advantages will be best understood by reference to the following detailed description taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The objects, features and advantages of the present invention will become apparent when the following description is read in conjunction with the accompanying drawings, in which:

[0011] Figure 1A is a side view of a bicycle with a drive unit and a battery system.

[0012] Figure 1B is a schematic diagram of a drive unit connected only to the main battery.

[0013] Figure 1C is a schematic diagram of a drive unit connected to the main and auxiliary batteries.

[0014] Figure 2A is a block diagram of main batteries configured for parallel charging.

[0015] Figure 2Bis a block diagram of auxiliary batteries configured for parallel charging.

[0016] Figure 3 is a schematic diagram showing a main battery and an auxiliary battery connected in parallel to a charging power source.

[0017] Figure 4 is a flow chart illustrating parallel charging of a battery system.

[0018] Figure 5A is a block diagram of main batteries configured for series charging.

[0019] Figure 5B is a block diagram of auxiliary batteries configured for series charging.

[0020] Figure 6 is a flow chart illustrating series charging of a battery system.

[0021] Figure 7 This is a schematic diagram of a battery system being charged in series.

[0022] Figure 8 It is a flow chart of the battery control system.

[0023] Fig. 9A is a block diagram of one embodiment of a battery system.

[0024] Fig. 9B yes Fig. 9A A block diagram of a battery system shown in FIG. 1 , in which only the main battery is connected to the system output.

[0025] Fig. 9C yes Fig. 9A A block diagram of a battery system is shown in FIG, where a primary battery and an auxiliary battery are connected to the system output.

[0026] Fig.9D yes Fig. 9A Block diagram of a battery system in parallel charging state shown in .

[0027] Fig.10 is a schematic diagram of one embodiment of a primary battery and auxiliary battery cell arrangement.

[0028] Fig.11 is a side view of one embodiment of an auxiliary battery coupled to a primary battery.

[0029] Fig.12 yes Fig.11 A cross-sectional view of the auxiliary battery and main battery shown in .

[0030] Fig.13 It is along Fig.11 A cross-sectional view of the auxiliary battery and the main battery taken along line 13-13.

[0031] Fig.14 It is along Fig.11 A cross-sectional view of the auxiliary battery and the main battery taken along line 14-14.

[0032] Fig.15A yes Fig.11 A top view of the auxiliary battery and main battery shown in .

[0033] Fig. 15B yes Fig.11 Bottom view of the auxiliary battery and main battery shown in .

[0034] Fig.16 is a top view of a main battery coupled to a storage container.

[0035] Fig.17 It is along Fig.16 A cross-sectional view of the main battery and storage container taken along line 17-17.

[0036] Fig.18 is an exploded view of the main battery and storage container.

[0037] Fig.19 is a close-up view of one embodiment of a latch in a closed position.

[0038] Fig. 20 yes Fig.19 A partial enlarged view of the latch in the open position is shown in . DETAILED DESCRIPTION

[0039] It should be understood that, as used herein, the term "multiple" refers to two or more. As used herein, the term "longitudinal" refers to, or is related to, a length or longitudinal direction. As used herein, the term "lateral" refers to being located in, pointing to, or extending in a left-right direction. The term "coupled" refers to being connected to or joined with ..., whether directly or indirectly (e.g., through an intermediate member), and does not require that the joining be fixed or permanent, although it may be fixed or permanent. The term "connected" may refer to an electrical connection or a mechanical connection. The term "communication / connectivity" refers to a connection that allows for the transmission of power and / or data, and may include a wired connection or a wireless connection. As used herein, the terms "first", "second", etc. are not meant to be assigned to a particular component so designated, but simply refer to these components in the numerical order described, which means that a component designated as "first" may later be a "second" such component, depending on the order in which it is referred to. It should also be understood that the designation of "first" and "second" does not necessarily mean that the two components or values ​​so designated are different, for example, this means that the first direction may be the same as the second direction, where each direction is only applicable to different components. The terms "upper", "lower", "rear", "front", "front", "rear", "vertical", "horizontal", "right", "left", "inside", "outside" and variations or derivatives thereof refer to the position of the upper portion, the lower portion, the front portion, the front portion, the rear portion, the vertical portion, the horizontal portion, the right side, the left side, the inner side, the outer side and variations or derivatives thereof, from the perspective of a user sitting thereon. Figure 1A , for example, an "inboard" component or feature is closer to a vertical mid-plane of the bicycle extending in direction A. The term "lateral" means non-parallel. The terms "outboard" and "outwardly" refer to directions or features that point away from a center position, for example, the phrases "radially outward," "radial directions," and / or derivatives thereof refer to features that radiate away from a center position. Conversely, the terms "inboard" and "inwardly" refer to directions that face toward a center or interior position. The term "subassembly" refers to an assembly of multiple components, wherein the subassemblies are capable of being assembled into other subassemblies and / or a final assembly, such as bicycle 50.

[0040] Figure 1AAn example of a human-powered vehicle is illustrated, which may also include an electric drive system. In this example, the vehicle is a possible type of bicycle 50, such as an electric bicycle (e-bike). Alternatively, the bicycle 50 may be a mountain bike, a road bike, etc. The bicycle 50 has a frame 52, a handlebar 54 near the front end of the frame 52, and a seat or saddle 56 for supporting the rider on the top of the frame 52. The bicycle 50 also has a first wheel or front wheel 58, which is carried by a front fork subassembly 60 supporting the front end of the frame 52. The bicycle 50 also has a second wheel or rear wheel 62 supporting the rear end of the frame 52. The rear end of the frame 52 may be supported by a rear suspension component 61 such as a rear shock absorber. The bicycle 50 has a drive train 64 with a crank assembly 66, which is operably coupled to a rear flywheel 70 or driven sprocket assembly near the wheel hub via a roller chain 68, which provides a rotation axis for the rear wheel 62. The crank assembly 66 includes at least one, typically two crank arms 75 and pedals 76. A crank spindle or crank axle can connect the two crank arms. The crank axle defines the central rotation axis of the chain ring assembly. The crank assembly may also include other components.

[0041] A rear shifting device 37, such as a derailleur, is arranged at the rear wheel 62 to move the roller chain 68 through different sprockets of the cassette 70. In one embodiment, a front shifting device (not shown), such as a derailleur, may be provided to move the chain 68. In the illustrated example, the saddle 56 is supported on a seat post 81 having an end portion received in the top of a frame seat tube 89 of the frame. A clamping ring may be tightened to secure the upper seat post 81 to the lower frame seat tube 89. Figure 1A , arrow A depicts the normal riding direction or forward movement direction of the bicycle 50.

[0042] Reference Figure 1A , the bicycle 50 includes a drive unit 100 mounted on the frame 52 and coupled to the crank assembly 66. The drive unit 100 can be powered to partially or fully assist in the rotation of the crank assembly 66, the associated movement of the chain 68, and the associated rotation of the flywheel 70 and the rear wheel 62. The drive unit 100 can be electrically coupled to an energy storage device, referred to as a main battery 102, which supplies power to the drive unit 100.

[0043] Reference Figure 1C , Figure 3 and Figures 11 to 15B , the battery system 103 includes a main battery 102 and an auxiliary battery 202, which can be mechanically and electrically releasably coupled using a connector. Figures 1A to 1C, the main battery 102 includes a contact connector or output terminal 185, which can be connected to the contact connector 184 or the charging power source 183 of the drive unit 100. The main battery 102 can be connected to the auxiliary battery 202 so that the main battery output power can be routed to the auxiliary battery. The main battery 102 and the auxiliary battery 202 are connected in series during discharge so that the total output voltage is increased and the total system capacity is also increased. For example, but not limited to, if the main battery 102 has a nominal voltage of V1 (e.g., 36V) and a nominal capacity of C1 (e.g., 626Wh), and the auxiliary battery 202 has a nominal voltage of V2 (e.g., 10.8V) and a nominal capacity of C2 (e.g., 188Wh), the total system voltage is VT=V1+V2 (e.g., 46.8V) and the nominal capacity CN=C1+C2 (e.g., 814Wh). It should be understood that the voltage and capacity values ​​are exemplary only and that other voltages and capacities are also suitable, meaning that any voltage and capacity of the main battery 102 may be combined with any voltage or capacity of the extension battery or auxiliary battery 202. In one embodiment, the drive unit 100 may accept a VT between and including 20 Vdc and 60 Vdc.

[0044] The main battery 102 is coupled to the drive unit 100 and / or the frame 52, wherein the main battery contacts or outputs 185 engage the drive unit battery contact connectors 184. The battery contact connectors on the main battery 102 contact and engage corresponding contacts on the drive unit or frame 52, which may be defined by a pair of prongs. The main battery 102 may be secured to the drive unit 100 and / or the frame 52 and held in place using a mounting device to maintain electrical connection.

[0045] The mounting device 120 can be defined by the shape of the main battery housing 122 and the interface between the housing 122, the bash guide, the frame 52 and / or the drive unit 100. The phrase "mounting device" refers to any structure that maintains the position of the main battery device 102 relative to the frame 52 and / or the drive unit 100, and can include an interface between the housing 122 and the frame 52 and / or the drive unit 100, which includes an interface between the contacts 124, 126 and / or can include additional fasteners, such as bolts, tabs, clamps, snaps, pawls, insert / socket interfaces and / or other suitable connectors. The main battery 102, and in particular the housing 122, is releasably connected to the frame 52 and / or the drive unit 100, which means that the energy storage device 102 and the housing 122 can be moved from an engaged position to a disengaged position and can be replaced with another energy storage device. The auxiliary battery 202 also includes a housing 222, which can be releasably coupled to the main battery housing 122 as further explained below.

[0046] Reference Figures 11 to 18 , the housing 122, 222 can be configured with a pair of laterally spaced opposing side walls 130, 230 or covers and a peripheral wall 132, 232 extending between and connected to the side walls 130, 230. One or more of the peripheral walls 132, 232 and the side walls 130, 230 can define an enclosure covered by the other side wall, wherein each of the side walls 130 and 230 defines a cover. For example, the side wall 130 can be coupled, such as by clamping with a fastener 133.

[0047] The housing 122 may include one or more charging ports including a battery contact connector or output 185. The battery contact connector may be a USB-C port or other electrical port on the main battery 102. The port may be located on any surface of the main battery 102 and exposed on that surface (e.g., a surface of the main battery that may be covered when the main battery 102 is installed in the bicycle 50, such as Figure 1A ). For example, the main battery 102 can be mounted in the down tube 53 of the frame 52, for example by sliding. In one embodiment, the main battery 102 may include a first charging port configured as a DC charging port, for example, the first charging port includes a pair of electrical contacts, and the second charging port can be configured as a USB C charging port. The charging ports can be located in the same location, or alternatively, one or two of the charging ports can be spaced apart and located on different parts of the housing, such as on one of the side walls 130. It should be understood that the charging ports can be located individually or together on any part of the housing. In another embodiment, the main battery 102 is configured with only a single charging port.

[0048] The side walls 130, 230 and the perimeter walls 132, 232 define the interior cavity 166, 266 of the housing. The side walls 130, 230 may be attached to the perimeter walls 132, 232 with a plurality of fasteners, shown as screws, or may be integrally formed therewith or connected using other fasteners, such as adhesives, snap fits, tabs, clamps, and / or other suitable fasteners.

[0049] Now refer to Fig.10 and Fig.12, the main battery 102 and the auxiliary battery 202 each include a plurality of battery cells 170, which are arranged or positioned in the housing 122, 222, and in particular, arranged or positioned in the internal cavity 166, 266 of the housing 122, 22. The battery cells 170 are individual cells connected in series and in parallel to form a cell group 172, 272. The battery pack cell configuration is described by the number of cells 170 in series and the number of cells 170 in parallel. There are many possible cell configurations for the cell group that may be suitable for use in the energy storage device, including, for example, but not limited to, 7S-3P, 10S-3P, 13S-2P, and 16S-2P configurations.

[0050] Reference Figure 5A and Figure 5B , the main battery 102 and the auxiliary battery 202 each include a battery management system (BMS) 174, 274 arranged in the housing 122, 222. The BMS 174, 274 can be mounted on a printed circuit board (PCB) arranged in the housing. The PCB is placed on the battery cell group 172, 272 and has contacts that form an electrical connection with the battery cell group 172, 272. The PCB is also arranged or installed in the interior 166, 266 of the housing 122, 222. The BMS 174, 274 is connected to each series battery cell group in the battery cell group 172, 272 to monitor whether there is a fault in the voltage of the battery cell. The BMS 174, 274 also measures the current in and out of the battery cell group 172, 272 to prevent overcurrent faults. The BMS 174, 274 may include temperature sensors distributed throughout the battery cell group to monitor the temperature of the battery cell group 172, 272 during charging and discharging, thereby preventing damage to the battery cell group due to overheating. Using all this information, the BMS 174, 274 can control the charge and discharge field effect transistors (FETs) 190, 192, 290, 292 to connect or disconnect the cell pack 172, 272 from the rest of the system during charging and discharging. The BMS 174, 274 receives configuration information from the microcontroller 178, 278 and the radio 180, 280. The configuration information may include charge / discharge current limits, individual cell voltage limits, and over / under temperature limits, which may be preset by the microcontroller firmware. The configuration information may also be updated via a firmware update, or dynamically updated based on information received by the microcontroller 178, 278 from other systems on the bicycle (e.g., information wirelessly received by the radio 180, 280).

[0051] In one embodiment, the main battery 102 and the auxiliary battery 202 also each include a charge controller 182, 282 disposed in the housing 122, 222 and mounted on the PCB. The charge controller 182 can be connected to the DC power source 183 through the output terminal 185 and to the main battery interconnect 187. The charge controller 282 is connected to a corresponding auxiliary battery interconnect 285, which can be operably electrically coupled to the main battery interconnect 187. The charge controller 182, 282 modulates the DC power to safely charge the battery packs 172, 272. In the case of a lithium-ion battery pack, the charge controller 182, 282 supplies a constant current to the battery cells 170 of the battery pack 172, 272 until a target voltage is reached, and then the charge controller supplies a constant voltage while the current slowly decreases to zero. During charging, the charging controller 182, 282 communicates with the battery management system 174, 274 and the microcontroller 178, 278, and receives messages from the battery management system 174, 274 and the microcontroller 178, 278 so that the charging controller 182, 282 can modulate the charging current based on the state of the battery, thereby providing fast and safe charging.

[0052] The microcontroller 178, 278 may be arranged in the housing 122, 222 or its internal cavity 166, 266 and mounted on a PCB. The microcontroller 178, 278 may receive data from the BMS 174, 274, the charging controller 182, 282, the inertial measurement unit (IMU), and / or the smartphone application via wireless or wired communication. The microcontroller 178, 278 uses the data to determine: how fast the battery pack 172, 272 is charging; how much power is supplied from the charging port 162 or the interconnect 187, 285 (if connected); whether the main battery 102 or the auxiliary battery 202 has lost power when not installed in the bicycle; when to display the battery charge state (SOC) with an indicator (e.g., an LED) and / or when to enable the output of the main battery 102 and / or the auxiliary battery. The smartphone application may receive information about the main battery 102 and the auxiliary battery 202 via the microcontroller 178, 278 and the radio device 180, 280. Some of the information that can be transmitted to the user or human machine interface (HMI) (also referred to as user interface) (e.g., smartphone) can be SOC, estimated charging time, faults, temperature of the battery pack 172, 272, voltage of a single battery cell 170, total battery pack voltage, and health of the battery pack 172, 272. The smartphone application can also send information to the battery pack 172, 272.

[0053] The main battery 102 and the auxiliary battery 202 may also include an indicator 203, which in one embodiment is configured as an LED array mounted on a PCB, wherein the LED is visible to the user through the housing or on the outside of the housing. The indicator may be a collection of red / blue / green (RGB) LEDs that may be used to display SOC, error messages, or general bicycle alarms. The collection of LEDs may be activated based on whether the main battery 102 and / or the auxiliary battery 202 has been installed, via a battery installation detection device, or by an IMU. Indications may also be transmitted to the user via a smartphone app. Push notifications of failures may remind the user in more detail what caused the main battery 102 and / or the auxiliary battery 202 to fail. Inside the app, the battery SOC and health status may be displayed on the component screen. In one embodiment, multiple indicators provide various indications. There are several potential ways to use these LEDs to indicate SOC and failures to the user. For example, an SOC indication may be provided when the main battery 102 and / or the auxiliary battery 202 are not installed in the bicycle, and may be triggered, for example, when the main battery 102 and / or the auxiliary battery 202 are picked up or otherwise moved, where the movement is detected by the IMU.

[0054] The main battery 102 and the auxiliary battery 202 may each include a sensor disposed in or on the housing 122, 222 that detects whether the battery 102, 202 is installed on the bicycle. The sensor may include a contact, force and / or space sensor, and may be a magnetic, button, NFC, IR sensor, or any other type of sensor, whether electrical or mechanical.

[0055] The IMU may be arranged in or on the housing 122, 222 and may be mounted on a PCB. The IMU includes an accelerometer, a gyroscope and / or a magnetometer. The IMU may use these three sensors to determine the position of the main battery 102 and / or the auxiliary battery 202 in space and their relative movement. The IMU may communicate with the microcontroller 178, 278 to track whether the main battery 102 and / or the auxiliary battery 202 has any impact when it is not installed on the bicycle 50. If an impact has been detected, additional safety checks may be performed to ensure that the main battery 102 and / or the auxiliary battery 202 are still safe to use. Data from the IMU may also be sent to other components on the bicycle via the radio device 180, 280.

[0056] The main battery 102 and the auxiliary battery 202 each include a charge / discharge FET 190, 192, 290, 292 or MOSFET, which is arranged in or on the housing 122, 222 and can be mounted on a PCB. The FET 190, 192, 290, 292 is used to control the flow of power into and out of the energy storage device during charging and discharging. The FET 190, 192, 290, 292 also allows the output terminals of the battery to be inactive when the battery is not installed.

[0057] Although the main battery 102 and the auxiliary battery 202 are connected in series during discharge, the main battery 102 and the auxiliary battery 202 may be connected in parallel or in series during charging. Figure 1C and Figure 8 As shown in , although discharging is always performed by connecting the battery packs 102, 202 in series, charging can be performed by placing the battery packs in parallel or in series, such as Figures 2A to 4 One or both of the batteries 102, 202 include an integrated charge controller 182, 282 so that the only connection to the output of the main battery pack 102 during charging is a DC power source. Figure 2A and Figure 5A As shown in FIG. 1 , the switch network 300 is located in the main battery 102 , but the switch network 300 need not be located in the main battery 102 or the auxiliary battery 202 and may be located separately from the main battery 102 or the auxiliary battery 202 as an independent subsystem.

[0058] The main battery 102 has a first output voltage and is configured to be electrically coupled to the drive unit 100 and to supply power to the drive unit. The auxiliary battery 202 has a second output voltage, such that when the auxiliary battery 202 is releasably coupled in series to the main battery 102, the total output voltage of the main battery 102 and the auxiliary battery 202 is equal to the sum of the first output voltage and the second output voltage.

[0059] The main battery 102 and the auxiliary battery 202 can be mechanically and electrically releasably coupled. For example, the batteries 102, 202 can be coupled with fasteners such as bolts or screws or clamps. In one embodiment, the main battery 102 is configured with a first mating feature 301, such as Fig.11 and Fig.12, and the auxiliary battery 202 includes a second mating feature 302, wherein the first mating feature 301 and the second mating feature 302 and the main battery 102 and the auxiliary battery 202 are movable relative to each other between a disengaged configuration in which the main battery 102 is separated from the auxiliary battery 202 and an engaged configuration in which the main battery 102 is coupled to the auxiliary battery 202. In one embodiment, the first mating feature 301 and the second mating feature 302 define a dovetail joint, wherein the mating feature 301 defines a protruding member having a tapered sidewall and the mating feature 302 defines a recess having a corresponding tapered sidewall. In operation, the auxiliary battery 202 can slide relative to the main battery in a lateral direction (e.g., parallel to the orientation of the bottom bracket) so as to insert the mating feature 301 into the mating feature 302.

[0060] The latch 310 can releasably secure the main battery 102 and the auxiliary battery 202 in an engaged configuration. The mounting direction is parallel to the bottom bracket axis so that most of the load generated by riding the bicycle is carried by the form-fitting mating features 301, 302, and minimal load is applied to the latch 310. The first mating feature 301 and the second mating feature 302 can be configured with a chamfer 312 on the first contact area of ​​the elements, a slight draft angle on the body of the feature, and some flexibility within the form fit to facilitate engagement while minimizing movement during riding.

[0061] The latch 310 prevents the auxiliary battery 202 from being disengaged from the main battery 102, such as by sliding. Fig.19 and Fig. 20 As shown in , the latch 310 is mounted on the auxiliary battery 202, but it should be understood that the latch 310 can be mounted on the main battery. The latch includes a beam 314 that can rotate about a pivot 316. The beam 314 includes a first portion 318 that pivots after the mating features 301, 302 are engaged, and the first portion 318 pivots to engage with the surface of the main battery 102 or in one embodiment, the side 320 of the mating feature 301. A second portion 324 of the beam 314 on the opposite side of the pivot 316 is connected to a push rod 322 via a link 326 having pivotable joints 328, 330 on both ends. The push rod 322 is supported in the auxiliary battery housing 222 by a support member 332 and moves along a linear path. A spring 334 is connected to the push rod 322 and biases the push rod 322 outward, thereby forcing the latch into position as shown. Fig.19334 and the beam 314 are pushed into engagement with the main battery 102. In operation, a user pushes the button 336 at the end of the push rod 322 to counteract the force of the spring 334 and move the beam 314 out of engagement with the main battery 102, thereby allowing the user to slide the auxiliary battery 202 to a disengaged position relative to the main battery 102. To install the batteries 102, 202, the user simply slides the batteries 102, 202 relative to each other to an engaged position with the button 336 pushed and then releases the button 336, causing the spring 334 to push the beam 314 into engagement with the main battery 102. In the disclosed embodiment, the push direction on the button 336 is the same as the direction required to remove the auxiliary battery 202 from the main battery 102, but it should be understood that the opposite direction is also suitable.

[0062] Reference Figures 16 to 18 , for example, if supplemental power is not required and / or if additional storage is required, the storage container 350 can be engaged with the main battery 102 in place of the auxiliary battery 202. The storage container 350 includes a housing 352 having sidewalls 354 and a cavity 356, in which various user accessories such as locks or personal items can be stored. A cover 358 can slide longitudinally relative to the housing 352 to close the cavity 356. The cover 358 and / or the housing 352 can include a latch feature 360 ​​such as a detent to releasably maintain engagement between the cover 358 and the housing 352. The bottom of the housing 352 includes a mating feature 303 as described above, which can be matingly engaged with the mating feature 301 of the main battery 102 and allows the storage container 350 and the main battery 102 to move relative to each other between a disengaged configuration in which the main battery 102 is separated from the storage container 350 and an engaged configuration in which the main battery 102 is coupled to the storage container 350. The storage container 350 may also include a latch 310 as described above to releasably engage the main battery 102 .

[0063] Charge:

[0064] In one embodiment, and with reference to Figure 2A , Figure 5A and Figure 7, the switch network 300 is operably coupled to the main battery 102 and the auxiliary battery 202, and is configured to connect the main battery 102 and the auxiliary battery 202 in parallel with the charging power source 183. Alternatively, the switch network 300 is operably coupled to the main battery 102 and the auxiliary battery 202, and is configured to connect the main battery 102 and the auxiliary battery 202 in series with the charging power source 183. At least one of the main battery 102 and the switch network 300 includes a main battery bypass switch 179, which is configured to bypass the charging of the main battery 102. Similarly, at least one of the auxiliary battery 202 and the switch network 300 includes an auxiliary battery bypass switch 279, which is configured to bypass the charging of the auxiliary battery 202.

[0065] Parallel charging solution

[0066] Reference Figures 2A to 4 In the parallel charging implementation, each battery 102, 202 includes its own battery management system (BMS) 174, 274, microcontroller 178, 278, radio 180, 280 (which may be optional), charging and discharging safety switches 190, 192, 290, 292, and charging controllers 182 and 282. When a charging power source 183 is connected to the system, the switch network 300 configures the battery 102, 202 to be connected to the system output 185, as shown. Figure 2A and Figure 3 . This allows the voltage of the charging power source 183 to be directly connected to each of the charging controllers 182, 282, so that each battery 102, 202 can regulate its own charging voltage and current. This results in a system in which each battery 102, 202 is isolated and its charging process does not affect the charging process of another battery. Another advantage of this implementation is that if there is a situation where the auxiliary battery 202 is not electrically connected to the main battery 102, the auxiliary battery 202 can be charged independently of the main battery 102.

[0067] Reference Figure 2A , Figure 2B , Figure 3 and Figure 4In operation, for example, in act 600, the charging power source 183 is connected to the main battery 102. In act 602, the microcontroller 178 determines whether the auxiliary battery 202 is connected to the main battery 102 in an engaged configuration. If the batteries 102, 202 are connected, then in act 604, the batteries 102, 202 are connected in parallel via the interconnects 187, 285, and in act 606, the charging power source 183 supplies power to both charging controllers 182, 282. If, in act 602, the microcontroller 178 determines that the auxiliary battery 202 is not connected to the main battery 102 in an engaged configuration, then in act 608, the main battery 102 is connected to the output 185, and in act 610, the charging power source 183 supplies power to the charging controller 182.

[0068] Series charging solution

[0069] exist FIG. 5A to FIG. 7 In the series charging implementation shown in FIG. 1 , only the main battery 102 requires a charge controller 182, wherein when the auxiliary battery 202 requires charging, the switch network 300 routes power from the charge controller 182 in the main battery 102 to the auxiliary battery 202. A battery bypass switch 179, 279 may be included in each battery 102, 202 or in the switch network 300. The battery bypass switches 179, 279 work with the rest of the switches in the system to allow power to flow around the cells 170 in the main battery 102 or the auxiliary battery 202 and to the other batteries 102, 202 in the system. For example, if the main battery 102 is fully charged, but the auxiliary battery 202 is not fully charged, the charging power source 183 will be connected to the system output 185, and current will flow from the charge controller 182 in the main battery 102. From there, power will flow to the positive terminal or interconnect 285 of the auxiliary battery 202, through the auxiliary battery 202, and then back to system ground through the main battery bypass switch 179.

[0070] Reference Figure 5A , Figure 5B , Figure 6 and Figure 7 In operation, for example, in act 600, the charging power source 183 is connected to the main battery 102. In act 602, the microcontroller 178 determines whether the auxiliary battery 202 is connected to the main battery 102 in an engaged configuration. If in act 602, the microcontroller 178 determines that the auxiliary battery 202 is not connected to the main battery 102 in an engaged configuration, then in act 608, the main battery 102 is connected to the output terminal 185, and in act 610, the charging power source 183 supplies power to the charging controller 182.

[0071] If the batteries 102, 202 are connected, then in action 612, the batteries 102, 202 are connected in series via the interconnect 187, 285, and in action 614, the output of the charge controller 182 is connected to the extended interconnect 187, 285, and in particular to the positive terminal. In action 616, the power supply 183 supplies power to the two batteries 102, 202 in series. In action 618, the microcontroller 178, 278, the battery management system 174, 274, and the charge controller 182 determine whether the batteries 102, 202 are fully charged, and if so, in action 620, charging is complete. If in action 618, the battery is not fully charged, then in action 622, the microcontroller 278 and the battery management system 274 determine whether the auxiliary battery 202 is fully charged, and if so, in action 624, the battery bypass switch 279 is activated to bypass the auxiliary battery 202 so that in action 626, the charging voltage can be reduced to match the main battery 102. In action 622, if the auxiliary battery 202 is not fully charged, then in action 628, the microcontroller 178, the battery management system 174, and the charging controller 182 determine whether the main battery 102 is fully charged, and if so, the microcontroller 278 and the battery management system 274 determine whether the auxiliary battery 202 is fully charged; if so, in action 630, the battery bypass switch 179 is activated to bypass the main battery 102 so that in action 632, the charging voltage can be reduced to match the auxiliary battery 202. In act 634 , the main battery 102 and the auxiliary battery 202 are charged, and the loop returns to act 618 .

[0072] System Control

[0073] Reference Figure 8 and 9A to 9D, in operation, for example, in act 636, the battery system is turned on, and in act 602, the microcontroller 178 determines whether the auxiliary battery 202 is connected to the main battery 102 in an engaged configuration. If in act 602, the auxiliary battery 202 is not connected, then in act 638, the main battery 102 is connected to the drive unit 100, and the user can operate the bicycle in act 640. If in act 602, it is determined that the auxiliary battery 202 is connected to the main battery 102, then in act 642, the microcontroller 278 and the BMS 274 determine whether the auxiliary battery 202 has an acceptable SOC. If not, then in act 644, the auxiliary battery 202 is not connected to the main battery 102, and in act 646, the user is notified of the low SOC of the auxiliary battery 202 and that the main battery 102 is connected, so that in act 640, the user can use the bicycle 50. If it is determined in act 642 that the auxiliary battery 202 has a sufficient charge, then in act 648 the auxiliary battery 202 is connected in series with the main battery 102 so that the user can thereafter use the bicycle in act 640. In this embodiment, the system can be automatically controlled without user intervention, wherein the auxiliary battery 202 is always incorporated into the system with an acceptable SOC.

[0074] In one embodiment, the user may control the addition of the auxiliary battery 202. In act 650, the system determines whether the user has disabled the auxiliary battery 202, and if not, in act 652, the auxiliary battery 202 is connected to the main battery 102. If so, in act 654, the auxiliary battery 202 is disconnected from the system and only the main battery 102 is connected for power.

[0075] Reference 9A to 9D , if only the main battery 102 is used, switch 660 is closed and switches 662, 664, 666 are open. If both the main battery 102 and the auxiliary battery 202 are in use, switches 662 and 664 are closed, and switches 660 and 666 are open. During parallel charging, switches 660, 664, and 666 are closed. Switches 660 and 664 can be back-to-back NFETs to prevent current from flowing through the body diode. Switches 662 and 666 can be single NFETs, but can also be back-to-back NFETs.

[0076] Cell Configuration

[0077] Since the system discharges in series, the main battery 102 and the auxiliary battery 202 do not have to have the same voltage. However, in one embodiment, the batteries 102, 202 have the same number of parallel cells. For example, and with reference to Fig.10, if both the primary battery 102 and the auxiliary battery 202 have three (3) cells in parallel, the total system current is not limited by either battery 102, 202. The system has the same current limit with both batteries 102, 202 connected as if only the primary battery 102 is connected. However, if the auxiliary battery 202 has fewer cells in parallel than the primary battery 102, the auxiliary battery 202 may limit the total system current output to whatever current the parallel cells can output. The same is true if the auxiliary battery 202 has more cells in parallel than the primary battery 102, except that the main battery 102 may limit the current output in this case. In one embodiment, the total system voltage may be increased to a level where the system current for the same power output will drop enough that the auxiliary battery 202 may have fewer cells in parallel than the primary battery 102. It should be understood that the system is not limited to any particular number of cells in series or parallel, wherein, Fig.10 That is, in one embodiment, the main battery 102 has a first number of cells 170 arranged in parallel, and the auxiliary battery 202 has a second number of cells 170 arranged in parallel, wherein the first number and the second number are the same.

[0078] In alternative embodiments, dedicated hardware implementations, such as application specific integrated circuits, programmable logic arrays, and other hardware devices, may be constructed to implement one or more of the methods described herein. Applications of the devices and systems that may include various embodiments may broadly include various electronic and computer systems. One or more embodiments described herein may use two or more specific interconnected hardware modules or devices to implement functions using related control and data signals that may be transmitted between and through the modules or as part of an application specific integrated circuit. Therefore, the present system includes software, firmware, and hardware implementations.

[0079] One embodiment of the radio device 180, 280 or communication interface provides data and / or signal communication from the energy storage device to another component of the bicycle or an external device (e.g., a mobile phone or other computing device). The communication interface uses any operable connection to transmit data. An operable connection can be a connection in which signals, physical communications, and / or logical communications can be sent and / or received. An operable connection can include a physical interface, an electrical interface, and / or a data interface. The communication interface can be configured as a wireless communication system for wireless communication, and therefore can include one or more antennas. The communication interface provides wireless communication in any format now known or later developed. Although this specification describes components and functions that can be implemented in specific embodiments with reference to specific standards and protocols, the present invention is not limited to such standards and protocols. For example, Internet and other packet switching network transmission standards (e.g., TCP / IP, UDP / IP, HTML, HTTP, HTTPS) represent examples of the prior art. These standards are regularly replaced by faster or more efficient equivalent standards with substantially the same functionality. It may also be used or used instead and / or ANT+ TM Standards. Therefore, replacement standards and protocols having the same or similar functions as those disclosed herein are considered equivalents thereof. In one embodiment, the communication interface can be configured to send a signal indicating the power determined based on the body measured strain. In addition, the determined power can be transmitted wirelessly.

[0080] The HMI may be one or more buttons, keypads, keyboards, mice, styluses, trackballs, rocker switches, touchpads, voice recognition circuits, or other devices or components for transmitting data between a user and an energy storage device. The HMI may be a touch screen, which may be capacitive or resistive. The HMI may include a liquid crystal display ("LCD") panel, a light emitting diode ("LED"), an LED screen, a thin film transistor screen, or other types of displays. The HMI may also include audio functionality or speakers.

[0081] In one embodiment, the HMI includes an LED indicator that illuminates to indicate input of a command or other action to the power meter system.

[0082] The HMI is configured to send and / or receive data, such as control signals and / or commands, to and / or from bicycle components (e.g., rear derailleur 37). The HMI uses any operable connection for data communication. An operable connection may be a connection in which signals, physical communications, and / or logical communications may be sent and / or received. An operable connection may include a physical interface, an electrical interface, and / or a data interface. The HMI provides wireless communications in any format known now or developed later. Although this specification describes components and functions that can be implemented in specific embodiments with reference to specific standards and protocols, the present invention is not limited to such standards and protocols. For example, Internet and other packet switching network transmission standards (e.g., TCP / IP, UDP / IP, HTML, HTTP, HTTPS) represent examples of the prior art. These standards are regularly replaced by faster or more efficient equivalent standards having substantially the same functionality. Therefore, replacement standards and protocols having the same or similar functionality as those disclosed herein are considered to be equivalents thereof.

[0083] According to various embodiments of the present disclosure, the methods described herein may be implemented with a software program executable by a computer system (e.g., a circuit). In addition, in an exemplary, non-limiting embodiment, implementations may include distributed processing, component / object distributed processing, and parallel processing. Alternatively, a virtual computer system process may be configured to implement one or more of the methods or functions as described herein.

[0084] A computer program (also referred to as a program, software, software application, script, or code) may be written in any form of programming language, including compiled or interpreted languages, and may also be deployed in any manner, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program may be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document), in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files storing one or more modules, subroutines, or code portions). A computer program may be deployed to execute on one computer or on multiple computers located at one site or distributed across multiple sites and interconnected by a communications network.

[0085] The processes and logic flows described in this specification may be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output. The processes and logic flows may also be performed by special purpose logic circuits, and the apparatus may also be implemented as special purpose logic circuits, such as FPGAs (field programmable gate arrays) or ASICs (application specific integrated circuits).

[0086] As used in this application, the term "circuitry" or "circuitry" refers to all of the following: (a) a pure hardware circuit implementation (e.g., an implementation in the form of analog and / or digital circuits only) and (b) a combination of circuitry and software (and / or firmware), such as (as applicable): (i) a combination of a processor or (ii) portions of processor / software (including digital signal processors), software, and memory that work together to enable a device (e.g., a mobile phone or server) to perform various functions) and (c) a circuit, such as a microprocessor or a portion of a microprocessor, that requires software or firmware to operate, even if the software or firmware is not physically present.

[0087] The definition of "circuitry" applies to all uses of this term in this application, including all uses in any claims. As another example, as used in this application, the term "circuitry" would also cover only an implementation of a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and / or firmware and other electronic components. The term "circuitry" would also cover (for example, and if applicable to a particular claim element) a baseband integrated circuit or application processor integrated circuit for a mobile computing device or a similar integrated circuit in a server, cellular network device, or other network device.

[0088] For example, processors suitable for executing computer programs include general and special purpose microprocessors and any one or more processors of any type of digital computer. Typically, the processor receives instructions and data from a read-only memory or a random access memory or both. The basic elements of a computer are a processor for executing instructions and one or more memory devices for storing instructions and data. Typically, the computer also includes one or more large-capacity storage devices for storing data, such as magnetic disks, magneto-optical disks, or optical disks, or is operably connected to receive data from or transmit data to the large-capacity storage device, or both. However, the computer does not need to have such a device. In addition, the computer can be embedded in another device (for example, a mobile phone, a personal digital assistant (PDA), a mobile audio player, a global positioning system (GPS) receiver, or a power meter system, etc.). Computer-readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media, and memory devices, including, for example, semiconductor memory devices, such as EPROM, EEPROM, and flash memory devices; magnetic disks, such as internal hard disks or removable disks; magneto-optical disks; and CD ROM and DVD-ROM disks. The processor and memory can be supplemented by or incorporated into a dedicated logic circuit.

[0089] The illustrations of the embodiments described herein are intended to provide a general understanding of the structures of various embodiments. These illustrations are not intended to be used as a complete description of all elements and features of the equipment and systems utilizing the structures or methods described herein. Many other embodiments may be apparent to those skilled in the art after reading this disclosure. Other embodiments may be utilized and derived from this disclosure so that structural and logical replacements and changes may be made without departing from the scope of this disclosure. Additionally, the illustrations are representative only and may not be drawn to scale. Certain proportions in the illustrations may be exaggerated, while other proportions may be minimized. Therefore, this disclosure and the accompanying drawings should be considered illustrative rather than restrictive.

[0090] Although this specification contains many details, these details should not be interpreted as limitations on the scope of the present invention or the content that may be claimed, but rather as descriptions of the features of specific embodiments of the present invention. Certain features described in the context of separate embodiments in this specification may also be implemented in combination in a single embodiment. On the contrary, the various features described in the context of a single embodiment may also be implemented in multiple embodiments individually or in any suitable sub-combination. In addition, although features may be described above as working in certain combinations, and even initially claimed to be so protected, in some cases, one or more features from the claimed combination may be deleted from the combination, and the claimed combination may point to a variant of a sub-combination or a sub-combination.

[0091] Similarly, although operations and / or actions are depicted in the accompanying drawings and described herein in a particular order, this should not be understood as requiring that the operations be performed in the particular order or sequential order shown, or that all of the operations shown be performed, to achieve the desired results. In some cases, multitasking and parallel processing may be advantageous. In addition, the separation of various system components in the above-described embodiments should not be understood as requiring such separation in all embodiments, and it should be understood that any described program components and systems can generally be integrated into a single software product or packaged into multiple software products.

[0092] One or more embodiments of the present disclosure may be referred to herein individually and / or collectively as the term "invention", which is for convenience only and is not intended to actively limit the scope of the present application to any particular invention or inventive concept. In addition, although specific embodiments have been shown and described herein, it should be understood that any subsequent arrangements designed to achieve the same or similar purposes may replace the specific embodiments shown. The present disclosure is intended to cover any and all subsequent adaptations or variations of the various embodiments. The combination of the above embodiments and other embodiments not specifically described herein will be apparent to those skilled in the art upon reviewing this description.

[0093] The Abstract of the Disclosure is provided to comply with 37 CFR §1.72(b) and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. In addition, in the foregoing Detailed Description, various features may be grouped together or described in a single embodiment for the purpose of simplifying the disclosure. This disclosure should not be interpreted as reflecting an intention that the claimed embodiments require more features than expressly recited in each claim. On the contrary, as reflected in the following claims, the subject matter of the present invention may be directed to less than all features of any disclosed embodiment. Therefore, the following claims are incorporated into the Detailed Description, with each claim independently defining separately claimed subject matter.

[0094] It is intended that the above detailed description be regarded as illustrative rather than limiting, and it should be understood that the following claims, including all equivalents, are intended to define the scope of the invention. The claims should not be understood as limited to the described order or elements unless otherwise stated. Therefore, all embodiments within the scope and spirit of the following claims and their equivalents are claimed as the present invention to be protected.

[0095] Although the embodiments are described for illustrative purposes, it will be appreciated by those skilled in the art that various modifications, additions and substitutions are possible without departing from the scope and spirit of the present disclosure. Therefore, it is intended that the foregoing description be regarded as illustrative rather than restrictive, and it should be understood that all equivalents and / or combinations of the embodiments and examples are intended to be included in this description.

[0096] Although certain parts, components, features, and methods of operation and use are described herein according to the teachings of the present disclosure, the coverage of this patent is not limited thereto. On the contrary, this patent covers all embodiments taught by the present disclosure, which fully fall within the scope of permitted equivalents.

Claims

1. A drive system for a bicycle, the drive system comprising: Drive unit; a main battery including a charge controller and having a first output voltage, wherein the main battery is configured to be electrically coupled to and supply power to the drive unit; and An auxiliary battery having a second output voltage, wherein the auxiliary battery is releasably coupled in series to the main battery such that a total output voltage of the main battery and the auxiliary battery is equal to a sum of the first output voltage and the second output voltage.

2. The drive system according to claim 1, wherein: The charge controller includes a first charge controller, and wherein the auxiliary battery includes a second charge controller.

3. The drive system of claim 2, further comprising a switch network operably coupled to the main battery and the auxiliary battery, wherein: The switch network is configured to connect the main battery and the auxiliary battery in parallel to a charging power source.

4. The drive system according to claim 2, wherein: The main battery includes a first battery management system, and the auxiliary battery includes a second battery management system.

5. The drive system according to claim 3, wherein: The main battery includes a first microcontroller operably connected to the first battery management system and the first charge controller, and wherein the auxiliary battery includes a second microcontroller operably connected to the second battery management system and the second charge controller.

6. The drive system of claim 1, further comprising a switch network operably coupled to the main battery and the auxiliary battery, wherein: The switch network is configured to connect the main battery and the auxiliary battery in series to a charging power source.

7. The drive system according to claim 6, wherein: At least one of the main battery and the switch network includes a main battery bypass switch configured to bypass charging of the main battery.

8. The drive system according to claim 7, wherein: At least one of the auxiliary battery and the switch network includes an auxiliary battery bypass switch configured to bypass charging of the auxiliary battery.

9. The drive system according to claim 1, wherein: The main battery includes a first number of battery cells arranged in parallel, and wherein the auxiliary battery includes a second number of battery cells arranged in parallel, wherein the first number and the second number of battery cells are the same.

10. The drive system according to claim 1, wherein: The main battery includes a first mating feature and the auxiliary battery includes a second mating feature, wherein the first mating feature and the second mating feature are movable relative to each other between a disengaged configuration and an engaged configuration, in which the main battery is separated from the auxiliary battery and in which the main battery is connected to the auxiliary battery.

11. The drive system according to claim 10, wherein: The engagement configuration includes a first engagement configuration, and the disengagement configuration includes a first disengagement configuration, and the drive system also includes a storage container, the storage container includes a third mating feature, wherein the first mating feature and the third mating feature are movable relative to each other between a second disengagement configuration and a second engagement configuration, in which the main battery is separated from the storage container, and in the second engagement configuration, the main battery is connected to the storage container.

12. A battery system for a bicycle, the battery system comprising: a main battery including a charge controller and having a first output voltage, wherein the main battery includes a bicycle mounting device; An auxiliary battery having a second output voltage, wherein the auxiliary battery is movable relative to the main battery between a first engagement configuration and a first disengagement configuration, in which in the first engagement configuration the auxiliary battery is releasably connected in series to the main battery such that a total output voltage of the main battery and the auxiliary battery is equal to a sum of the first output voltage and the second output voltage, and in the first disengagement configuration the auxiliary battery is separated from the main battery.

13. The battery system according to claim 12 further comprises a storage container, wherein the storage container is movable relative to the main battery between a second engaged configuration and a second disengaged configuration when the auxiliary battery is in the first disengaged configuration, wherein in the second engaged configuration, the storage container is releasably connected to the main battery, and in the second disengaged configuration, the storage container is separated from the main battery.

14. The battery system according to claim 13, wherein: The main battery includes a first mating feature, and wherein the auxiliary battery and the storage container each include a second mating feature, wherein the first mating feature and the second mating feature can move relative to each other between one of the first disengaged configuration and the second disengaged configuration and one of the first engaged configuration and the second engaged configuration, in which the main battery is separated from the auxiliary battery and the storage container in one of the first disengaged configuration and the second disengaged configuration, and in which the main battery is connected to one of the auxiliary battery or the storage container in one of the first engaged configuration and the second engaged configuration.

15. A battery system for a bicycle, the battery system comprising: a main battery including a charge controller, wherein the main battery has a first output voltage, wherein the main battery is configured to be electrically coupled to a drive unit and to supply power to the drive unit; an auxiliary battery having a second output voltage, wherein the auxiliary battery is releasably coupled in series to the main battery such that a total output voltage of the main battery and the auxiliary battery is equal to a sum of the first output voltage and the second output voltage; and A switch network is operably coupled to the main battery and the auxiliary battery, wherein the switch network is configured to connect the main battery and the auxiliary battery in parallel or in series with a charging power source.

16. The battery system according to claim 15, wherein: At least one of the main battery and the switch network includes a main battery bypass switch configured to bypass charging of the main battery.

17. The battery system according to claim 15, wherein: At least one of the auxiliary battery and the switch network includes an auxiliary battery bypass switch configured to bypass charging of the auxiliary battery.

18. The battery system according to claim 15, wherein: The main battery includes a first number of cells arranged in parallel, and wherein the auxiliary battery includes a second number of cells arranged in parallel, wherein the first number and the second number are the same.

19. The battery system according to claim 15, wherein: The main battery includes a first mating feature and the auxiliary battery includes a second mating feature, wherein the first mating feature and the second mating feature are movable relative to each other between a disengaged configuration and an engaged configuration, in which the main battery is separated from the auxiliary battery and in which the main battery is connected to the auxiliary battery.

20. The battery system of claim 19, further comprising a latch that releasably secures the primary battery and the auxiliary battery in the engaged configuration.

21. The battery system according to claim 20, wherein: The engagement configuration includes a first engagement configuration, and the disengagement configuration includes a first disengagement configuration, and the battery system also includes a storage container, the storage container including a third mating feature, wherein the first mating feature and the third mating feature are movable relative to each other between a second disengagement configuration and a second engagement configuration, wherein in the second disengagement configuration, the main battery is separated from the storage container, and in the second engagement configuration, the main battery is connected to the storage container.

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