An aerosol generating device
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- JT INTERNATIONAL SA
- Filing Date
- 2024-12-16
- Publication Date
- 2026-06-25
Smart Images

Figure CN2024139596_25062026_PF_FP_ABST
Abstract
Description
AN AEROSOL GENERATING DEVICETechnical Field
[0001] The present disclosure relates to an aerosol generating devices, and in particular to an aerosol generating device that is configured to atomise or aerosolise an aerosol generating substrate to generate an aerosol for inhalation by a user. The present disclosure is particularly applicable to a portable (hand-held) aerosol generating device. Embodiments of the present disclosure relate in particular to an aerosol generating device having a detachable battery module.
[0002] Technical Background
[0003] An aerosol generating device is designed to produce aerosol by heating an aerosol generating substrate housed in an aerosol generating article. Unlike traditional methods that involve burning or combusting tobacco, the aerosol generating device heats the aerosol generating substrate (e.g., a liquid or a non-liquid) to a temperature typically in the range 150℃ to 300℃ to generate a vapour which typically cools and condenses to form an aerosol for inhalation by a user of the device during a vaping session. In recent years, the use of such reduced-risk or modified-risk devices has gained popularity compared to traditional methods.
[0004] In accordance with recent regulatory requirements, there is a need for electronic consumer devices (which include aerosol generating devices) to have batteries that are replaceable either by a user or by a semi-specialist service centre. In conventional aerosol generating devices, the battery is often fully embedded within the structure of the device, making removal and replacement challenging because several components must be dismantled and removed to replace the battery. Consequently, not only is access to the battery difficult, but there is also a possibility that the device might malfunction if the person attempting to remove and replace a battery does not correctly reassemble and reconnect all components. Furthermore, providing users with access to the functional components of the device inside the housing thereof allows dirt ingress, which may harm performance and introduce new safety challenges.
[0005] A technique to meet the above mentioned challenges is to introduce a dedicated battery module that can be easily accessed and replaced, allowing a user to replace the battery without disassembling the entire aerosol generating device. However, whilst this arrangement may significantly simplify the replacement of a depleted battery, a battery module that is separable from a control model necessitates the provision of an electrical connection between the battery module and the control module, so that power may be supplied from the battery module to the control module. It is possible that a foreign substance, such as liquid or dirt, might contaminate the electrical connection between the battery module and the control module during replacement of the battery module. Incorrect connection between the battery module and the control module and / or contamination of the electrical connection parts by a foreign substance could potentially result in a short circuit, which may cause damage to the aerosol generating device and / or pose a safety concern.
[0006] In light of the above discussion, there is a need for a low-cost aerosol generating device which allows safe replacement of the dedicated battery module. Further, the proposed design of the aerosol generating device should not compromise the size of the aerosol generating device.
[0007] Summary of the Disclosure
[0008] According to a first aspect of the present disclosure, there is provided an aerosol generating device comprising:
[0009] a control module including control circuitry, the control module being releasably attachable, in use, to an atomiser module configured to atomise an aerosol generating substrate and generate an inhalable aerosol; and
[0010] a battery module configured to receive a battery and releasably attachable to the control module;
[0011] wherein the control module comprises a first electrical interface having:
[0012] a control module ground terminal, and
[0013] a control module first positive terminal;
[0014] wherein the battery module comprises a second electrical interface having:
[0015] a battery module ground terminal,
[0016] a battery module positive terminal, and
[0017] a battery module signal terminal,
[0018] the second electrical interface being operable to supply power to the control module from the battery module when electrically coupled to the first electrical interface;
[0019] wherein the battery module further comprises battery protection circuitry operable to utilise the battery module signal terminal to determine the presence or absence of a short circuit condition at the second electrical interface.
[0020] According to a second aspect of the present disclosure, there is provided an aerosol generating device comprising:
[0021] a control module including control circuitry, the control module being releasably attachable, in use, to an atomiser module configured to atomise an aerosol generating substrate and generate an inhalable aerosol; and
[0022] a battery module including a battery and releasably attachable to the control module;
[0023] wherein the control module comprises a first electrical interface having:
[0024] a control module ground terminal, and
[0025] a control module first positive terminal;
[0026] wherein the battery module comprises a second electrical interface having:
[0027] a battery module ground terminal,
[0028] a battery module positive terminal, and
[0029] a battery module signal terminal,
[0030] the second electrical interface being operable to supply power to the control module from the battery module when electrically coupled to the first electrical interface;
[0031] wherein the battery module further comprises battery protection circuitry operable to utilise the battery module signal terminal to determine the presence or absence of a short circuit condition at the second electrical interface.
[0032] The aerosol generating device is configured to generate an inhalable aerosol, and in particular to atomise or aerosolise an aerosol generating substrate to generate an aerosol for inhalation by a user. The aerosol generating substrate may be provided as an aerosol generating article. In some examples, the aerosol generating device may be configured to heat an aerosol generating substrate without burning or combusting the aerosol generating substrate, to volatise at least one component of the aerosol generating substrate and thereby generate a heated vapour which may cool and condense to form an aerosol for inhalation by a user of the aerosol generating device. The aerosol generating device is typically a hand-held, portable, device which may be self-contained and low temperature.
[0033] In general terms, a vapour is a substance in the gas phase at a temperature lower than its critical temperature, which means that the vapour can be condensed to a liquid by increasing its pressure without reducing its temperature, whereas an aerosol is a suspension of fine solid particles or liquid droplets in air or another gas. It should, however, be noted that the terms ‘aerosol’ and ‘vapour’ may be used interchangeably in this specification, particularly with regard to the form of the inhalable medium that is generated for inhalation by a user.
[0034] Embodiments of the present disclosure substantially eliminate or at least partially address the aforementioned problems in the prior art and provide an aerosol generating device with a battery that can be safely replaced thanks to the provision of a battery module that includes a second electrical interface having a battery module ground terminal, a battery module positive terminal, and a battery module signal terminal, wherein the battery module further comprises battery protection circuitry operable to utilise the battery module signal terminal to determine the presence or absence of a short circuit condition at the second electrical interface.
[0035] Some prior art battery modules include an electrical interface having a battery positive terminal and one (or two) battery module ground terminals, where the battery module is protected against a short circuit by a lithium-ion battery protection integrated circuit located between the battery itself and the terminals. In some cases, such battery protection integrated circuits may permit a battery module to continue to output at low loads, even when a short circuit condition exists, which may result in the battery module becoming undesirably hot. In accordance with the present disclosure, a battery module signal terminal is provided in addition to the battery module positive and ground terminals. By observing the state of the battery module signal terminal, the battery protection circuitry disclosed herein may respond more accurately to short circuit conditions.
[0036] Optional features will now be set out. These are applicable singly or in any combination with any aspect of the present disclosure.
[0037] The battery protection circuitry may be operable to prevent output from the battery to the control module if the short circuit condition is detected. In this way, operation of the aerosol generating device may be prevented in the event that a short circuit condition is detected, so improving user safety.
[0038] The battery protection circuitry may be operable to output a test signal from the battery module positive terminal, and to detect a received signal at the battery module signal terminal. The battery protection circuitry may be operable to compare the received signal to a threshold parameter, such as a threshold voltage, in order to determine the presence or absence of the short circuit condition. Under correct operation, the test signal output from the battery module positive terminal should follow a known electrical path through a connected control module before being subsequently received at the battery module signal terminal as the received signal. Thus, where the test signal has a known electrical parameter (e.g. a known voltage) the corresponding parameter of the received signal should be predictable. In a short circuit condition, the test signal output from the battery module positive terminal may take an unpredictable path to reach the battery module signal terminal, or may not reach the battery module signal terminal at all. In such a situation, the parameters of the received signal may be unpredictable. Thus, by comparing the received signal to the predefined threshold parameter, the battery protection circuitry may determine whether a short circuit condition exists. Typically, the threshold parameter may be a threshold voltage. The test signal may be output at a first voltage, and the threshold voltage may be a defined percentage of the first voltage, such as 90%, 95%, 98%or 99%. In some examples, the threshold voltage may be 100%of the first voltage, such that the threshold voltage equals the first voltage.
[0039] The battery protection circuitry may be further operable to utilise the battery module ground terminal to determine the presence of absence of the short circuit condition.
[0040] A short circuit condition may be determined to be present:
[0041] if the first electrical interface is connected to the second electrical interface, and
[0042] if the received signal detected at the battery module signal terminal has a voltage below the threshold voltage. This may reflect a situation where the control module is connected to the battery module incorrectly, resulting in a short circuit between the battery module ground terminal and one or more of the battery module signal terminal and the battery module positive terminal.
[0043] Alternatively, a short circuit condition may be determined to be present:
[0044] if the received signal detected at the battery module signal terminal has a voltage equal to or above the threshold voltage whilst the battery module ground terminal is open. This may reflect a situation where the control module is connected to the battery module incorrectly, resulting in a short circuit between the battery module signal terminal and the battery module positive terminal.
[0045] A short circuit condition may be determined to be absent:
[0046] if the first electrical interface is connected to the second electrical interface, and
[0047] if the received signal detected at the battery module signal terminal has a voltage equal to the threshold voltage. This may reflect a situation where the control module is connected to the battery module correctly. In such a situation, the battery module protection circuitry may be operable to permit output from the battery to the control module.
[0048] The second electrical interface may be arranged such that the battery module ground terminal is located between the battery module positive terminal and the battery module signal terminal. More particularly, the second electrical interface may be arranged such that the battery module positive terminal and the battery module signal terminal are located equally spaced on either side of the battery module ground terminal. This may provide a compact arrangement for the second electrical interface, which may facilitate connection to a first electrical interface which is reversible.
[0049] The first electrical interface may have rotational symmetry when turned through 180 degrees. This may permit the control module to be connected to the battery module at one of two rotational positions, so improving ease of use.
[0050] The terminals of the first and second electrical interfaces may be located such that when the first electrical interface is electrically coupled to the second electrical interface, the control module ground terminal is electrically coupled to the battery module ground terminal, the control module first positive terminal is electrically coupled to the battery module positive terminal and the control module first positive terminal is electrically coupled to the battery module signal terminal. Such an arrangement may result in a situation where a high signal at the battery module signal terminal reflects the presence of a high signal at the battery module positive terminal. In this way, a high signal at the battery module signal terminal may be used as a determiner for the presence or absence of a short circuit condition.
[0051] The first electrical interface may further comprise a control module second positive terminal. Said control module second positive terminal may be electrically connected to the control module first positive terminal, such that the two said positive terminals are interchangeable and / or function as a single positive terminal. This may provide an alternative physical structure for the first electrical interface, which also facilitates reversibility. For example, the first electrical interface may be arranged such that the control module ground terminal is located between the control module first positive terminal and the control module second positive terminal. More particularly, the control module first and second positive terminals may be equally spaced on either side of the control module ground terminal.
[0052] The terminals of the first and second electrical interfaces may be located such that when the first electrical interface is electrically coupled to the second electrical interface, the control module ground terminal is electrically coupled to the battery module ground terminal, one of the control module first or second positive terminals is electrically coupled to the battery module positive terminal, and the other of the control module first or second positive terminals is electrically coupled to the battery module signal terminal. Such an arrangement may result in a situation where a high signal at the battery module signal terminal reflects the presence of a high signal at the battery module positive terminal. In this way, a high signal at the battery module signal terminal may be used as a determiner for the presence or absence of a short circuit condition.
[0053] The aerosol generating device may further comprise the atomiser module configured to atomise an aerosol generating substrate and generate an inhalable aerosol.Brief Description of the Drawings
[0054] The summary above, as well as the following detailed description of illustrative embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the present disclosure, exemplary constructions of the disclosure are shown in the drawings. However, the present disclosure is not limited to specific methods and instrumentalities disclosed herein. Moreover, those in the art will understand that the drawings are not to scale. Wherever possible, like elements have been indicated by identical numbers.
[0055] Embodiments of the present disclosure will now be described, by way of example only, with reference to the following drawings, in which:
[0056] Figure 1 is a diagrammatic view of an aerosol generating device comprising a battery module, a control module and an atomiser module in an assembled state;
[0057] Figure 2 is a diagrammatic view of the aerosol generating device of Figure 1 in a disassembled state;
[0058] Figure 3 is a diagrammatic view showing a control module including a first electrical interface and a battery module including a second electrical interface in a disconnected state;
[0059] Figure 4 is a block diagram schematically illustrating a battery module;
[0060] Figure 5 is a block diagram schematically illustrating a control module; and
[0061] Figure 6 is a circuit diagram including a second electrical interface.
[0062] In the accompanying drawings, an underlined number is employed to represent an item over which the underlined number is positioned or an item to which the underlined number is adjacent. A non-underlined number relates to an item identified by a line linking the non-underlined number to the item. When a number is non-underlined and accompanied by an associated arrow, the non-underlined number is used to identify a general item at which the arrow is pointing.Detailed Description of Embodiments
[0063] The following detailed description illustrates embodiments of the present disclosure and ways in which they can be implemented. Although some modes of carrying out the present disclosure have been disclosed, those skilled in the art would recognize that other modes for carrying out or practicing the present disclosure are also possible.
[0064] In the description of the present invention, it should be understood that the orientation or positional relationship terms "one end" , "another end" , "the other end" , "outside" , "inside" , "upper" , "lower" , "above" , "top" , "bottom" , "horizontal" , "coaxial" , "central" , "length" , "distance" , etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description. Specifically, the orientation or positional relationship terms should be understood as the aerosol generating device being in its upright position (top-down) . Otherwise, the specific meanings of the above terms in the present invention should be understood according to specific situations that make the most technical sense for the skilled person in the art.
[0065] Figure 1 illustrates a diagrammatic view of an aerosol generating device 10 in accordance with an embodiment of the present disclosure. The aerosol generating device 10 includes three modules, namely a battery module 12 including a battery 13, a control module 14 including control circuitry 15, and an atomiser module 16. During use of the aerosol generating device 10, the battery module 12 and the control module 14 are releasably attached to each other and control module 14 and the atomiser module 16 are releasably attached to each other. The battery module 12, the control module 14 and the atomiser module 16 are separable from each other as shown in Figure 2 to permit replacement of one or more of these components.
[0066] The atomizer module 16 may include an atomiser 17 (e.g., a heater) for atomising an aerosol generating substrate 18 to produce an inhalable aerosol. In some examples, the aerosol generating substrate 18 may comprise an aerosol generating liquid (e.g., containing nicotine) . The atomiser module 16 may include a liquid store for storing the aerosol generating liquid and may possibly include a liquid transfer member, such as a wick, for transferring liquid from the liquid store to the heater. In some examples, the atomiser module 16 may be configured as a cartomizer.
[0067] The control circuitry 15 of the control module 14 may comprise one or more integrated circuits and other electrical components, such as a microcontroller unit (MCU) and / or microprocessor unit (MPU) . The control circuitry 15 may comprise a printed circuit board assembly (PCBA) .
[0068] The control module 14 couples the battery module 12 to the atomiser module 16. The control circuitry 15 may be connected to a user interface 20 comprising inputs such as a power button for receiving commands from a user and / or outputs such as indicator lights or a display screen for providing information to the user. The control circuitry 15 may also be connected to an antenna for wireless communication with a remote device such as the user’s smartphone, which can be used for input and output, as well as for relaying data between the aerosol generating device 10 and external entities such as its manufacturer.
[0069] A first end 22 of the aerosol generating device 10, shown towards the bottom of Figures 1 and 2, is described for convenience as a distal, bottom, base or lower end of the aerosol generating device 10. A second end 24 of the aerosol generating device 10, shown towards the top of Figures 1 and 2, is described for convenience as a proximal, top or upper end of the aerosol generating device 10. During use, the user typically orients the aerosol generating device 10 with the first end 22 downwards and / or in a distal position with respect to the user’s mouth and the second end 24 upwards and / or in a proximal position with respect to the user’s mouth.
[0070] The atomiser module 16 may be releasably attached to the control module 14 by a first releasable connection 26. The first releasable connection 26 may, for example, be a snap-fit connection or alternatively, a magnetic connection, a threaded connection, or a bayonet connection. Accordingly, after the aerosol generating substrate 18 has been depleted, the atomiser module 16 can be separated from the control module 14 and a replacement atomiser module 16 can then be connected in its place, to allow further use of the aerosol generating device 10.
[0071] Similarly, the control module 14 may be releasably attached to the battery module 12 by a second releasable connection 28. The second releasable connection 28 includes a mechanical connection assembly and an electrical connection assembly 30. The mechanical connection assembly is responsible for physically securing the two modules together, and may, for example, be a snap-fit connection or alternatively, a magnetic connection, a threaded connection, or a bayonet connection. Thus, when the battery 13 within the battery module 12 requires replacement, the battery module 12 can be separated from the control module 14. The battery 13 within the removed battery module 12 may then be replaced, after which the battery module 12 may be reconnected to the control module 14 to allow further use of the aerosol generating device 10. Alternatively, a replacement battery module 12 can instead be connected to the control module 14 in place of the removed battery module 12, if preferred.
[0072] The electrical connection assembly 30 comprises a first electrical interface 32 and a second electrical interface 34. The first electrical interface 32 is provided on the control module 14, whilst the second electrical interface 34 is provided on the battery module 12. The second electrical interface 34 is electrically connected to the battery 13 included in the battery module 12, via battery control circuitry 36. When the first and second electrical interfaces 32, 34 are electrically coupled together, the second electrical interface 34 is operable to supply power from the battery 13 in the battery module 12 to the first electrical interface 32 in the control module 14. The first electrical interface 32 is electrically connected to the control circuitry 15 included in the control module 14, which makes use of the power supplied from the battery to operate the functions of the aerosol generating device 10.
[0073] As shown best in Figure 3, the first electrical interface 32 includes a plurality of electrical terminals, namely a control module ground terminal 38 and at least one control module positive terminal. In the example shown, the first electrical interface 32 includes a control module first positive terminal 40 and a control module second positive terminal 42. The control module second positive terminal 42 is electrically connected to the control module first positive terminal 40. The first electrical interface 32 thus comprises three electrical terminals, with the ground terminal 38 being located in between two equally spaced positive terminals 40, 42. The first electrical interface is thus reversible, in that it has two distinct connection orientations, and so can be connected to the battery module either in a first orientation or in a second orientation that is rotated through 180 degrees from the first orientation.
[0074] The second electrical interface 34 includes at least three electrical terminals, specifically, a battery module ground terminal 44, a battery module positive terminal 46, and a battery module signal terminal 48. The battery module ground terminal 44 is located between the battery module positive terminal 46 and the battery module signal terminal 48. The second electrical interface 34 thus comprises three electrical terminals, with the battery module positive terminal 46 and the battery module signal terminal 48 being equally spaced on either side of the battery module ground terminal 44.
[0075] The terminals of the first and second electrical interfaces 32, 34 are located such that when the first electrical interface 32 is electrically coupled to the second electrical interface 34, the control module ground terminal 38 is electrically coupled to the battery module ground terminal 44, one of the control module first or second positive terminals 40, 42 is electrically coupled to the battery module positive terminal 46, and the other of the control module first or second positive terminals 40, 42 is electrically coupled to the battery module signal terminal 48.
[0076] As shown in more detail in Figure 4, the battery module 12 includes a battery 13 and battery control circuitry 36, in the form of a micro-control unit (MCU) . The battery 13 is rechargeable, and may be recharged via a charging port 52 having overvoltage / overcurrent protection 54 as well as a battery protection chip under control of the MCU 36. An optional temperature sensor 56 is operable to monitor battery temperature during charging and discharging, and to provide that monitored temperature information to the MCU 36. An optional output interface 58, such as an LED, may be used by the MCU 36 to convey information to a user of the device.
[0077] As shown in more detail in Figure 5, the control module 14 includes an atomiser 17 and control circuitry 15. When the first and second electrical interfaces 32, 34 are electrically coupled together power may be supplied to the atomiser 17 in control module 14 from the battery 13 in the battery module 12 via the positive terminals 40 / 42, 46 of the respective first and second electrical interfaces 32, 34. Furthermore, the battery module signal terminal 48 can be used to detect whether said power is being supplied correctly.
[0078] To this end, the battery module further comprises battery protection circuitry 50 that is operable to utilise the battery module signal terminal 48 to determine the presence or absence of a short circuit condition at the second electrical interface 34. The battery protection circuitry 50 may be comprised within the battery control circuitry 36, or electrically connected thereto. Further details of the battery protection circuitry are shown in Figure 6.
[0079] In operation, the battery protection circuitry is operable to output a test signal from the battery module positive terminal 46, and to detect a received signal at the battery module signal terminal 48. In the example shown, the test signal takes the form of a high-level voltage which is output from the battery module positive terminal 46 through the resistor R2. “High level” in the current example refers to a voltage greater than 0.9V, although it will be appreciated that this is implementation specific.
[0080] The battery protection circuitry 50 is operable to compare the signal that is received at the battery module signal terminal 48 with a threshold voltage, in order to determine the presence or absence of the short circuit condition. Under correct operation, the test signal output from the battery module positive terminal 46 should follow a predefined electrical path through a connected control module 14 before being subsequently received at the battery module signal terminal 48 as the received signal. Thus, where the test signal has a known voltage, the voltage of the received signal should be predictable, an should depend only on the known properties of the predefined electrical path that the test signal must follow to reach the battery module signal terminal 48. The threshold voltage is thus set to a predefined percentage of the test signal, which is selected based on the known properties of the circuit. In the present example, the threshold voltage is set as being approximately equal to the voltage of the test signal, i.e. the threshold voltage is 0.9V.
[0081] In a short circuit condition, the test signal output from the battery module positive terminal 46 may take an unpredictable path to reach the battery module signal terminal 48, or may not reach the battery module signal terminal at all. In such a situation, the parameters of the received signal may be unpredictable, such that the voltage of the received signal may vary from the expected threshold voltage. The test signal may be received at another terminal of the battery module instead of or as well as being received at the battery module signal terminal 48. Thus, the battery protection circuitry 50 checks the voltage state of the three terminals 44, 46, 48 in the second electrical interface 34 before outputting power to the control module.
[0082] Five potential situations exist, as follows:
[0083] ● Case 1, control module connected correctly to battery module. In this case, the battery module signal terminal 48 detects a high voltage level (i.e. 0.9V in the present example) from the battery module positive terminal 46. This matches the threshold voltage, and the battery module is permitted to turn on.
[0084] ● Case 2, short-circuit between battery module signal terminal 48 and battery module ground terminal 44. In this case, the battery module signal terminal 48 detects a low voltage level (in this case, less than 0.75V) . This is less than the threshold voltage, and the battery module is not permitted to turn on.
[0085] ● Case 3, short-circuit between battery module signal terminal 48 and battery module positive terminal 46. In this case, the battery module signal terminal 48 detects a high voltage level from the battery module positive terminal 46, and the battery module is permitted to turn on. However, the battery module will not output, because the battery module ground terminal 44 is open.
[0086] ● Case 4, short-circuit between battery module positive terminal 46 and battery module ground terminal 44. In this case, the battery module signal terminal 48 detects nothing, and the battery module is not permitted to turn on.
[0087] ● Case 5, short-circuit between all battery module terminals 44, 46, 48. In this case, the battery module signal terminal 48 detects a low voltage level from the battery module ground terminal 44, and the battery module is not permitted to turn on.
[0088] The battery module is configured such that it will never output without the control module being connected.
[0089] The aerosol generating device described herein thus provides a three terminal electrical connection arrangement that permits reversibility of connection between the control module and battery module whilst providing increased short circuit protection over prior art arrangements. It will be understood that more terminals may be included in the electrical interfaces, if required, and / or that the terminals may be provided in different locations to those discussed above.
[0090] Modifications to embodiments of the present disclosure described in the foregoing are possible without departing from the scope of the present disclosure as defined by the accompanying claims. Expressions such as “including, ” “comprising, ” “incorporating, ” “have, ” “is” used to describe and claim the present disclosure are intended to be construed in a non-exclusive manner, namely allowing for items, components or elements not explicitly described also to be present. Reference to the singular is also to be construed to relate to the plural.
Claims
1.An aerosol generating device (10) comprising:a control module (14) including control circuitry (15) , the control module (14) being releasably attachable, in use, to an atomiser module (16) configured to atomise an aerosol generating substrate (18) and generate an inhalable aerosol; anda battery module (12) configured to receive a battery (13) and releasably attachable to the control module (14) ;wherein the control module (14) comprises a first electrical interface (32) having:a control module ground terminal (38) , anda control module first positive terminal (40) ;wherein the battery module (12) comprises a second electrical interface (34) having:a battery module ground terminal (44) ,a battery module positive terminal (46) , anda battery module signal terminal (48) ,the second electrical interface (34) being operable to supply power to the control module (14) from the battery module (12) when electrically coupled to the first electrical interface;wherein the battery module further comprises battery protection circuitry (50) operable to utilise the battery module signal terminal (48) to determine the presence or absence of a short circuit condition at the second electrical interface (48) .2.The aerosol generating device of claim 1, wherein the battery protection circuitry (50) is operable to prevent output from the battery (13) to the control module (14) if the short circuit condition is detected.3.The aerosol generating device of claim 1 or claim 2, wherein the battery protection circuitry (50) is operable to output a test signal from the battery module positive terminal (46) , and to detect a received signal at the battery module signal terminal (48) , wherein the battery protection circuitry (50) is operable to compare the received signal to a threshold voltage in order to determine the presence or absence of the short circuit condition.4.The aerosol generating device of claim 3, wherein the test signal is output at a first voltage, and the threshold voltage is a defined percentage of the first voltage.5.The aerosol generating device of claim 3 or claim 4, wherein the battery protection circuitry (50) is operable to determine that the short circuit condition is present:if the first electrical interface (32) is connected to the second electrical interface (34) , andif the received signal detected at the battery module signal terminal (48) has a voltage below the threshold voltage.6.The aerosol generating device of any one of claims 3 to 5, wherein the battery protection circuitry (50) is operable to determine that the short circuit condition is present:if the received signal detected at the battery module signal terminal (48) has a voltage equal to or above the threshold voltage whilst the battery module ground terminal (44) is open.7.The aerosol generating device of any one of claims 3 to 6, wherein the battery protection circuitry (50) is operable to determine that the short circuit condition is absent:if the first electrical interface (32) is connected to the second electrical interface (34) , andif the received test signal detected at the battery module signal terminal (48) has a voltage equal to the threshold voltage.8.The aerosol generating device of any preceding claim, wherein the second electrical interface (34) is arranged such that the battery module ground terminal (44) is located between the battery module positive terminal (46) and the battery module signal terminal (48) .9.The aerosol generating device of any preceding claim, wherein the second electrical interface (34) is arranged such that the battery module positive terminal (32) and the battery module signal terminal (34) are located equally spaced on either side of the battery module ground terminal (44) .10.The aerosol generating device of any preceding claim, wherein the first electrical interface (32) has rotational symmetry when turned through 180 degrees.11.The aerosol generating device of any preceding claim, wherein the terminals of the first and second electrical interfaces are located such that when the first electrical interface (32) is electrically coupled to the second electrical interface (34) , the control module ground terminal (38) is electrically coupled to the battery module ground terminal (44) , the control module first positive terminal (40) is electrically coupled to the battery module positive terminal (46) and the control module first positive terminal (40) is electrically coupled to the battery module signal terminal (48) .12.The aerosol generating device of any one of claims 1 to 10, wherein the first electrical interface (32) further comprises a control module second positive terminal (42) .13.The aerosol generating device of claim 12, wherein the first electrical interface (32) is arranged such that the control module ground terminal (38) is located between the control module first positive terminal (40) and the control module second positive terminal (42) , and preferably wherein the control module first and second positive terminals (40, 42) are equally spaced on either side of the control module ground terminal (38) .14.The aerosol generating device of claim 12 or claim 13, wherein the terminals of the first and second electrical interfaces are located such that when the first electrical interface (32) is electrically coupled to the second electrical interface (34) , the control module ground terminal (38) is electrically coupled to the battery module ground terminal (44) , one of the control module first or second positive terminals (40, 42) is electrically coupled to the battery module positive terminal (46) , and the other of the control module first or second positive terminals (40, 42) is electrically coupled to the battery module signal terminal (48) .15.The aerosol generating device of any preceding claim, further comprising the atomiser module (16) configured to atomise an aerosol generating substrate and generate an inhalable aerosol.