Energy storage module

Abstract

Energy storage module 10 is configured to transmit power to a surface treatment tool 1000 when in use. The module comprises: a housing 12 containing one or more energy storage cells 14; a power terminal in electrical communication with the one or more cells, configured to transmit power to the tool. A connection arrangement 18 may be provided on the housing and configured to releasably secure the module to the tool. The connection arrangement may comprise a first and second connection formations 20A, 20B which may form first and second releasable latching mechanisms with complementary formations of the first and / or second tool 1000. The housing of the module may comprise a stem to be received in the tool, and a head comprising a rest surface curved / angled with respect to the axis of the stem. Cells of the module may be in the head and stem of the housing.

Description

FIELD 5 The present disclosure relates to an energy storage module. The present disclosure also relates to a system comprising said energy storage module and a surface treatment tool (e.g. a cleaning tool). BACKGROUND 10 Traditionally, hand-guided tools / appliances were powered from a mains electricity supply via a power chord. However, advances in battery technology have recently led to the widespread adoption of cordless tools / appliances with rechargeable batteries, which are more convenient to use. 15 In some cases, the rechargeable batteries are fixed to the corresponding tool, which requires the tool to be connected to a charging cable in order to re-charge the battery. In other cases, the rechargeable batteries are provided in an energy storage module which is releasable from the corresponding tool. This allows the comparatively bulkier tool to be 20 stored at an appropriate location (e.g. in a cupboard) while the energy storage module is recharged closer to a power socket. Modern households and businesses often contain multiple hand-guided tools (e.g. wet and dry vacuum cleaners, mops / scrubbers, scrubber-dryers, disinfectant sprayers, power tools 25 and the like). Such tools each have different shapes and thus different locations which are suitable for receiving an energy storage module. This means that each tool typically has a bespoke energy storage module adapted for that particular application. Therefore, when multiple tools are used in a home / business, there is often a need to use multiple energy storage modules and corresponding chargers. This creates increased cost, additional 30 storage requirements and additional waste when the tools reach the end of their useful life. The present disclosure seeks to overcome, or at least mitigate, one or more problems of the prior art. 09 01 24 SUMMARY According to a first aspect of the disclosure an energy storage module is provided for use with a surface treatment tool such that the energy storage module is configured to 5 transmit power to said surface treatment tool when in use, wherein the energy storage module comprises: a housing containing one or more energy storage cells; and a power terminal in electrical communication with the one or more cells and configured to transmit power to said surface treatment tool. 10 The energy storage module further comprises a connection arrangement provided on the housing and configured to releasably secure the energy storage module to said surface treatment tool. 15 The connection arrangement comprises a first connection formation and a second connection formation, wherein the first connection formation is configured to form a first releasable latching mechanism with a first complementary formation of a first surface treatment tool, and wherein the second formation is configured to form a second releasable latching mechanism with a second complementary formation of said first and / or 20 a second surface treatment tool. Having a first connection formation configured to form a first releasable latching mechanism with a first complementary formation of a first surface treatment tool, and a second formation configured to form a second releasable latching mechanism with a 25 second complementary formation of the first and / or a second surface treatment tool allows the energy storage module to be connected to two different complementary formations. For example, the first connection formation can be used for engagement with a surface treatment tool having a first complementary formation at a first location, whereas the second connection formation can be used for engagement with the same or a different 30 surface treatment tool having a second complementary formation at a different location. Put another way, the first and second connection formations provide a versatile energy storage module that can be located at any one or a plurality of locations on a given surface treatment tool, by using either or both of the first and second connection formations, or 35 on a plurality of different surface treatment tools at locations appropriate to the surface treatment tool design. 09 01 24 The first and second connection formations are spaced apart on the housing, e.g. on opposing sides of the housing. Having the first and second connection formations spaced apart on the housing, e.g. on 5 opposing sides of the housing provides a greater flexibility on how the energy storage module can connect to the tool (i.e. via different portions of the housing). This allows flexibility in the location of the energy storage module with respect to said surface treatment tool when fitted to said surface treatment tool. 10 The housing comprises a stem configured to be received within a socket of said surface treatment tool and a head configured such that at least a portion of the head is visible when in use. Such a stem (e.g. an elongate length) provides a good connection with a corresponding 15 socket when it is received therewithin, while the visible head can be accessed for removing / replacing the energy storage module from the socket. Optionally, the head is configured to be at least partially external to said socket when in use. 20 The head being at least partially external to said socket in use facilitates easier gripping of the head by a user for removal of the energy storage module from said socket. Optionally, the head comprises a pair of external grip surfaces which face different 25 directions so that a user can grip the head via the external grip surfaces. Optionally, the energy storage module comprises a longitudinal axis and wherein the external grip surfaces extend over at least 10%, optionally at least 15%, of a length of the energy storage module, wherein the length extends along the longitudinal axis. Optionally, the external grip surfaces are substantially planar, e.g. substantially parallel to each other. 30 Optionally, the external grip surfaces are each recessed in a direction transverse (e.g. perpendicular) to the longitudinal axis with respect to an adjacent portion of the head. Such external grip surfaces facilitate easier gripping of the head by a user for removal of the energy storage module from said socket. For example, the grip surfaces facing 35 different directions (e.g. opposite directions) facilitate gripping between different parts of a hand (e.g. between fingers and palm or thumb) and the grip surfaces extending over at least 10% of the length provides a large enough area to be easily gripped by a user. Furthermore, the external grip surfaces being recessed in a direction transverse to the 09 01 24 longitudinal axis with respect an adjacent portion of the head facilitates better gripping of the grip surfaces since the adjacent portions of the head (which the grip surfaces are recessed with respect to) inhibit fingers or the like from slipping off the grip surfaces. 5 The energy storage module comprises a longitudinal axis and the stem is elongate along the longitudinal axis, and wherein the head projects outwards from the stem in a direction transverse to the longitudinal axis. Having a head which projects outwards from the stem in a direction transverse to the 10 longitudinal axis provides a larger internal volume defined by the head than would be possible if the head was of similar width to the stem or smaller. This allows more cells to be contained within the head, which increases the capacity of the energy storage module. Further, the elongate nature of the stem, when fitted in the socket, provides an effective counterbalance to the larger head portion. 15 The head comprises first and second abutment surfaces radially spaced apart on the housing with respect to the longitudinal axis, wherein the first and / or second abutment surface is arranged to engage a corresponding structure of the socket, and wherein the first and second abutment surfaces are provided at different axial positions along the 20 longitudinal axis. Having a head with a first abutment surface which is provided at a different position along the longitudinal axis as compared to the second abutment surface (e.g. further from an end of the stem than the second abutment surface) provides versatility in fitting to 25 different locations of a surface treatment tool. Moreover, since the first and second abutment surfaces are arranged to engage a corresponding structure of the socket (e.g. corresponding first and second abutment surfaces of the socket) the energy storage module and socket are shaped to co-operate 30 to enhance connection / support of the energy storage module in said socket. Optionally, the first and second abutment surfaces each extend transverse to the longitudinal axis for providing a stop surface configured to limit axial insertion of the energy storage module into said socket. The first connection formation is located proximal the first abutment surface and the second connection formation is located proximal the second abutment surface. 09 01 24 Having the first and second formations proximal the respective abutment surfaces allows the first and / or second connection formations to be engaged by a respective first or second complementary formation to secure the respective abutment surface against the complementary abutment surface of the socket. This provides a reliable engagement of 5 the energy storage module with a respective socket. Optionally, the head comprises an indicator surface comprising an indicator configured to display a status of the energy storage module (e.g. a charge status). 10 Having such an indicator surface / indicator on the head (i.e. the visible part of the energy storage module) allows a user to view the status of the energy storage module when the energy storage module is connected to a surface treatment tool, e.g. when the surface treatment tool is in use. 15 Optionally, the indicator surface is arranged at an oblique angle to the longitudinal axis. Many surface treatment tools (e.g. cleaning tools such as hand-guided scrubber-dryers) have a head for engaging a surface and an elongate body with a handle. During use, such surface treatment tools are typically held by a user in a position in which the elongate 20 body is positioned at an oblique angle with respect to a horizontal floor surface. When the energy storage module is inserted into a socket of such a surface treatment tool in a position where the longitudinal axis of the energy storage module is approximately parallel to the elongate body, having the indicator surface arranged at an oblique angle to 25 the longitudinal axis means that the indicator surface will face approximately upwards during normal use (e.g. forwards use) of the surface treatment tool. In this way, a user can easily view the status of the energy storage module when looking down on the surface treatment tool from above during normal use. 30 Optionally, the indicator surface is visible to a user when the energy storage module is connected to a surface treatment tool via said first releasable latching mechanism and / or when the energy storage module is connected to a surface treatment tool via said second releasable latching mechanism. 35 Such an indicator surface allows the charge status to be easily viewed when the first latching mechanism and / or second latching mechanism are used. 09 01 24 Optionally, the indicator comprises an illuminable element adhered to the indicator surface. Having an illuminable element which is adhered to the indicator surface (i.e. adhered to 5 an exterior surface of the housing) provides a simple means of providing an indicator, without having to create aperture(s) in the housing for viewing illuminable element(s) located inside the housing. Optionally, the first releasable latching mechanism comprises a notch and projection 10 configured to engage each other (e.g. a notch and / or projection provided by the first connection formation for engaging a corresponding projection and / or notch provided by the first complementary formation). Optionally, the second releasable latching mechanism comprises a notch and projection 15 configured to engage each other (e.g. a notch and / or projection provided by the second connection formation for engaging a corresponding projection and / or notch provided by the second complementary formation). Optionally, the first releasable latching mechanism comprises a static portion and a 20 movable portion configured to releasably engage the static portion (e.g. the first connection formation is static with respect to the housing and the first complementary formation is a movable latch, or vice versa). Optionally, the second releasable latching mechanism comprises a static portion and a 25 movable portion configured to releasably engage the static portion (e.g. the second connection formation is static with respect to the housing and the second complementary formation is a movable latch, or vice versa). It will be appreciated that any suitable latching mechanism may be used. It will further be 30 appreciated that the first and second latching mechanism may comprise the same or different types of latching mechanisms. Optionally, the head is configured to be external to said socket when the stem is received therewithin in use. The energy storage module comprises a longitudinal axis and the stem is elongate along the longitudinal axis. 09 01 24 Optionally, the head comprises a rest surface which is curved or angled with respect to said longitudinal axis, such that the rest surface is configured to rest against a substantially vertical structure when the longitudinal axis is positioned at an oblique angle with respect to the vertical structure. 5 When a user of a surface treatment tool (e.g. a cleaning tool such as a handheld scrubberdryer) wants to break from using the surface treatment tool, they commonly arrange the surface treatment tool such that one end rests against a vertical structure (e.g. a wall) with a longitudinal axis of the surface treatment tool arranged at an oblique angle to the 10 vertical structure. When the energy storage module is positioned in a socket at the end of such a surface treatment tool or other suitable location, such a curved or angled rest surface on the energy storage module provides an area of contact with the vertical structure which inhibits slippage therebetween. This reduces the likelihood of the surface treatment tool toppling over. 15 Optionally, the rest surface is configured to rest against a substantially vertical structure when the energy storage module is secured to said surface treatment tool via the first latching mechanism and / or when the energy storage module is secured to said surface treatment tool via the second latching mechanism. 20 Such a rest surface can conveniently be used to inhibit slippage of a surface treatment tool to which the energy storage module is connected when the first latching mechanism and / or second latching mechanism are used. 25 Optionally, the rest surface comprises a nonslip surface, for example a non-slip material, such as natural or synthetic rubber. Having a nonslip surface further inhibits slippage between the rest surface and a vertical wall on which it rests, which further reduces the likelihood of a surface treatment tool to 30 which the energy storage is connected toppling over. A nonslip surface may comprise surface features that increase friction, e.g. a surface roughening, or a nonslip material. Optionally, the rest surface comprises a high-friction surface relative to the remainder of the housing. The rest surface comprising a high-friction surface relative to the remainder of the housing allows different surface finishes or materials to be used away from the rest surface (e.g. more cost effective materials, more desirable surface finishes, and / or lower-friction 09 01 24 surfaces) whilst reducing the chance of slippage between the rest surface and a vertical structure such as a wall. Optionally, the rest surface is curved from a first location proximal the stem to a second 5 location distal the stem, wherein an angle between a tangent to the curve and the longitudinal axis increases from the first location to the second location. In comparison to a flat angled rest surface, such a curved rest surface can rest against a vertical structure (e.g. wall) with the energy storage module arranged at a range of angles 10 with respect to said structure, which provides the user with more flexibility around positioning of a surface treatment tool to which the energy storage module is connected. Optionally, the housing contains a plurality of cells, wherein at least one cell is located within the head and at least one cell is located in the stem. 15 Having at least one cell located in the stem (e.g. as opposed to having all cells located within the head) distributes the weight of the cells within the housing which balances the weight more evenly during movement of the energy storage module (e.g. during movement of a surface treatment tool to which the energy storage module is connected). 20 By better balancing the weight, the forces exerted by the energy storage module on the connection arrangement during movement are reduced, which increases the robustness of the connection between the energy storage module and the surface treatment tool. Optionally, each cell comprises a longitudinal axis, and wherein the stem comprises two 25 or more cells arranged end-to-end such that the longitudinal axes of said cells is parallel with the longitudinal axis of the energy storage module. Such an arrangement provides an efficient use of space within the stem. 30 Optionally, each cell comprises a longitudinal axis, and wherein the head comprises a plurality of cells arranged such that the longitudinal axes of said cells is transverse to the longitudinal axis of the energy storage module. Optionally, the number of cells in the head is greater than the number of cells in the stem. Optionally, the plurality of cells of the head are arranged side-to-side. Optionally, the head comprises five cells. Such an arrangement provides an efficient use of space within the head. 09 01 24 Moreover, when there are two or more cells in the stem arranged end-to-end and the number of cells in the head is greater than the number of cells in the stem (e.g. in particular when the head contains 5 cells), this arrangement of cells has been found to provide good balance of weight within the energy storage module such that the forces 5 exerted by the energy storage module on the connection arrangement during movement are reduced, which increases the robustness of the connection between the energy storage module and the surface treatment tool. Optionally, the stem comprises a cross-section having a poka-yoke shape to inhibit 10 incorrect insertion of the stem into a corresponding socket. Optionally, the stem comprises rails or liner projections for engagement with corresponding linear projections or rails of said socket. Such a poka-yoke shape prevents the stem from being inserted the wrong way round into 15 a socket. This is particularly useful when the energy storage module has a first connection formation configured to form a first releasable latching mechanism with a first complementary formation of said first surface treatment tool and a second connection formation configured to form a second releasable latching mechanism with a second complementary formation of the first and / or a second surface treatment tool, because a 20 user may not immediately be able to recognise which way round the energy storage module should go based on the position of the first and / or second complementary formations (e.g. movable latches) of the socket. Such rails / linear projections provide a simple means for ensuring correct orientation of the 25 stem with respect to a socket. Optionally, the energy storage module is a battery module. According to a further aspect of the disclosure, there is provided a system comprising an 30 energy storage module as disclosed herein and a surface treatment tool configured to receive the energy storage module. Optionally, the surface treatment tool comprises the first complementary formation for forming the first latching mechanism with the first connection formation of the energy 35 storage module and / or wherein the surface treatment tool comprises the second complementary formation for forming the second latching mechanism with the second connection formation of the energy storage module. 09 01 24 Optionally, the surface treatment tool comprises a hand-guided surface treatment tool. Optionally, the surface treatment tool comprises a motorised scrubber, wet-scrubber, scrubber-dryer, a spraying device or other cleaning tool. 5 Optionally, the system further comprises a charger, wherein the energy storage module is configured to be coupled to the charger such that the power terminal receives power from the charger. 10 BRIEF DESCRIPTION OF THE DRAWINGS The present disclosure will now be described, by way of example only, with reference to the following figures in which: 15 Figure 1 is a side view of an energy storage module according to an embodiment inserted partially into a socket in a handle of a tool; Figure 2 is an isometric view of the energy storage module of Figure 1 fully inserted into the socket; 20 Figure 3 is a side sectional view of the energy storage module of Figures 1 and 2 fully inserted into the socket; Figure 4 is an enlarged isometric sectional view of the energy storage module of Figures 25    1 to 3; Figure 5 is a side view of the energy storage module of Figures 1 to 4 forming a first releasable latching mechanism with a latching member; 30 Figure 6 is a side view of the energy storage module of Figures 1 to 5 forming a second releasable latching mechanism with a latching member; Figure 7 is an exploded diagram of a scrubber-dryer tool including the energy storage module of Figures 1 to 6; Figures 8a and 8b are side views of the energy storage module of Figures 1 to 7 resting against a vertical structure at first and second angles respectively; and 09 01 24 Figure 9 is a schematic view of an alternative energy storage module resting against a vertical structure. DETAILED DESCRIPTION 5 Referring to Figures 1 to 8b, an energy storage module 10 for transmitting power to a first surface treatment tool 1000 and a second surface treatment tool 2000 is shown. Figures 1 to 4, 8a, and 8b show the energy storage module 10 connected to an upper portion (e.g. a handle) of a first surface treatment tool 1000. It will be understood that the first surface 10 treatment tool 1000 would include a lower end (not shown) with components suitable for treatment of a surface (e.g. spraying, vacuuming, and / or scrubbing). For example, the first surface treatment tool 1000 may be a motorised scrubber, wet-scrubber, scrubberdryer, a spraying device or other cleaning tool. Figure 7 shows the energy storage module 10 in combination with a second surface treatment tool 2000 in the form of a hand-guided 15 scrubber-dryer machine. The energy storage module 10 is configured to transmit power to the corresponding surface treatment tool 1000, 2000 when in use. The energy storage module 10 has a housing 12 containing a plurality of energy storage cells 14, and a power terminal 16 in electrical communication with the cells 14. The power 20 terminal 16 is configured to transmit power to said first and second surface treatment tools 1000, 2000. In the illustrated embodiment, the energy storage module 10 is a battery module and the cells 14 are battery cells. In alternative embodiments, the housing 12 contains a different source of energy, e.g. fuel cells. 25 The energy storage module 10 has a connection arrangement 18 provided on the housing 12 which is configured to releasably secure the energy storage module 10 to said first and second surface treatment tools 1000, 2000. In more detail, the connection arrangement 18 includes a first connection formation 20A and a second connection formation 20B. The first connection formation 20A is configured to form a first releasable latching mechanism 30   24A with a first complementary formation 22A of a first surface treatment tool 1000 (e.g. as best shown in Figures 3 to 5). The second connection formation 20B is configured to form a second releasable latching mechanism 24B with a second complementary formation 22B of a second surface treatment tool 2000 (e.g. as best shown in Figures 6 and 7). 35 The provision of first and second connection formations 20A, 20B provide a versatile energy storage module 10 that can be located on a plurality of different surface treatment tools 1000, 2000 at locations appropriate to each surface treatment tool design, or at 09 01 24 plurality of locations on a given surface treatment tool, by using either or both of the first and second connection formations 20A, 20B. In the illustrated embodiment, the first and second connection formations 20A, 20B are 5 spaced apart on opposing sides of the housing 12. In alternative embodiments, the first and second formations 20A, 20B are spaced apart at other positions on the housing 12. As best illustrated in Figure 4, the first releasable latching mechanism 24A includes a notch 42 and projection 44 provided by the first connection formation 20A for engaging a 10 corresponding projection 44 and notch 42 provided by the first complementary formation 22A. In the illustrated embodiment, the first connection formation 20A is static with respect to the housing 12 and the first complementary formation 22A is a movable latch. In particular, the first complementary formation 22A is pivotal about a pivot axis P such that the projections 44 of the first releasable latching mechanism 24A can be disengaged 15 from the respective notches 42 of the first releasable latching mechanism 24A by pressing the first complementary formation 22A inwards. Similarly, as best illustrated in Figure 6, the second releasable latching mechanism 24B includes a notch 42 and projection 44 provided by the second connection formation 20B 20 for engaging a corresponding projection 44 and notch 42 provided by the second complementary formation 22B. In the illustrated embodiment, the second connection formation 20B is static with respect to the housing 12 and the second complementary formation 22B is a movable latch. In particular, the second complementary formation 22B is pivotal about a pivot axis P such that the projections 44 of the second releasable latching 25 mechanism 24B can be disengaged from the respective notches 42 of the second releasable latching mechanism 24B by pressing the second complementary formation 22B inwards. In alternative embodiments, the first complementary formation 22A is static with respect 30 to the socket 100 and the first connection formation 20A is a movable latch, and / or the second complementary formation 22B is static with respect to the socket 100 and the second connection formation 20B is a movable latch. It will be appreciated that any suitable latching mechanism may be used. It will further be 35 appreciated that the first and second releasable latching mechanisms 24A, 24B may comprise the same or different types of latching mechanisms. 09 01 24 The first and second connection formations 20A, 20B for forming the corresponding first and second latching mechanisms 24A, 24B provide a versatile energy storage module 10 that can be located on a plurality of different surface treatment tools 1000, 2000 at locations appropriate to each surface treatment tool design. 5 For example, the surface treatment tool 1000 illustrated partially in Figures 1 to 6 and 8a to 8b receives the energy storage module 10 at an upper end of the tool 1000 (i.e. in the handle 1002) which is space saving and can be used to counter-balance the weight of components (not shown) located on an opposing side of the handle. When fitted in such a 10 position, the first latching mechanism 24A formed by the first connection formation 20A is used to releasably attach the energy storage module 10 to the first surface treatment tool 1000. When the first surface treatment tool 1000 is in use, the first latching mechanism is located further from a portion of the handle 1002 that a user is likely to grip than if the second connection formation 20B were to be used. Therefore, the user is less likely to 15 accidentally disengage the first latching mechanism 24A (by accidentally pressing the movable latch of the first complementary formation 22A) than if the second latching mechanism 24B formed using the comparatively closer second connection formation 20B was used. Furthermore, when in normal use, the first latching mechanism 24A is typically located at an underside of the handle 1002 and so is less likely to be caught by a user's 20 hand or accidentally disengaged than if the second latching mechanism were to be used (which is typically located at an upper side of the handle 1002 when in normal use). However, having the second connection formation 20B in addition to the first connection formation 20A provides flexibility around where the energy storage module 10 can be connected to other surface treatment tools, depending on where is most convenient in 25 terms of space, weight distribution, accessibility and the like. Alternatively, the energy storage module 10 may be used with the second surface treatment tool 2000 illustrated in Figure 7. The second surface treatment tool 2000 is arranged to receive the energy storage module 10 in a socket 200 which is located distal 30 the upper end of the tool, parallel to an elongate support member 2002 of the second surface treatment tool 2000. Having the energy storage module 10 located distal the upper end of the tool 2000 (i.e. in contrast to the first surface treatment tool 1000 which receives the energy storage module 10 at the upper end) means that the weight of the energy storage module 10 is located lower down the elongate support member 2002, which results 35 in more weight being applied to the cleaning head 2006 of the surface treatment tool 2000. This increase in weight applied to the cleaning head 2006 improves cleaning performance (e.g. due to an increased force of scrubbing components of the cleaning head 09 01 24 2006 on a floor surface and / or improved contact between squeegee(s) of the cleaning head 2006 and a floor surface). In the arrangement of Figure 7, a portion of the energy storage module 10 is inaccessible 5 when received in the second socket 200. In the illustrated embodiment, a rear 56 of the energy storage module 10 is inaccessible when received in the second socket 200, such that the first latching mechanism 24A cannot be accessed. In this arrangement, the second latching mechanism 24B at the front 58 of the energy storage module 10 is used to couple the energy storage module 10 to the second surface treatment tool 2000 (e.g. the second 10 latching mechanism 24B shown in Figure 6 is used), since this can be easily accessed from a front 2004 of the tool. In alternative embodiments, a single surface treatment tool may include multiple sockets, each for receiving an energy storage module 10. For example, the surface treatment tool 15   2000 of Figure 7 could be modified so that an energy storage module 10 can be received in the handle in a similar way to the first surface treatment tool 1000. This would allow the user to select different locations for the energy storage module 10 depending on their preferred balancing of weight on the tool, or to use multiple energy storage modules 10 to increase the energy capacity of the tool. 20 As best illustrated in Figures 1, 3 and 7, the housing 12 has a stem 26 configured to be received within a socket 100, 200 of a surface treatment tool 1000, 2000. For example, Figure 1 illustrates the stem 26 being inserted into a socket 100 of the first surface treatment tool 1000, Figure 3 shows the stem 26 in place inside the socket 100 of the first 25 surface treatment tool, and Figure 7 shows the stem 26 being removed from a socket 200 of the second surface treatment tool 2000. Such a stem 26 provides a good connection with a corresponding socket 100, 200 when it is received therewithin. Moreover, when such a stem 26 is located within the handle 1002 30 of the surface treatment tool 1000 of Figures 1 to 4, this the use of space in the tool since the stem 26 occupies what may otherwise be an empty void. Furthermore, locating the energy storage module 10 at an upper end of the handle improves weight distribution with respect to a user's wrist when gripping the handle 1002, since the weight of the stem 26 (and the cells 14 contained therein) is in line with or closer to the user's grip than if the 35 entirety of the energy storage module 10 was positioned at an end of the handle 1002 or lower down the tool. 09 01 24 In the illustrated embodiment, the energy storage module 10 has a longitudinal axis A and the stem 26 is elongate along the longitudinal axis A. The housing 12 also has a head 28 configured such that at least a portion of the head 28 5 is visible when in use. In particular, the majority of the head 28 is configured to be external to the corresponding socket 100, 200 when in use, as illustrated in Figures 2 and 3 which show the head 28 external to the corresponding socket 100 of the first surface treatment tool 1000. 10 The majority of the head 28 being external to the corresponding socket 100, 200 in use facilitates gripping of the head 28 by a user for removal of the energy storage module 10 from the socket 100, 200. The head 28 has a pair of external grip surfaces 30A, 30B which face different directions 15 so that a user can grip the head 28 via the external grip surfaces 30A, 30B. Although only the first grip surface 30A is visible in the views of Figures 1 and 2, it will be understood that the second grip surface 30B is provided on an opposing side of the head 28. In the illustrated embodiment, the external grip surfaces 30A, 30B extend over more than 20   15% of a length of the energy storage module 10, wherein the length extends along the longitudinal axis A, which provides a large enough area to be easily gripped by a user. In the illustrated embodiment, the external grip surfaces 30A, 30B are substantially planar and parallel to each other (i.e. facing opposite directions), but in alternative embodiments 25 the grip surfaces 30A, 30B are non-planar and / or not parallel to each other, whilst still facing different directions. In the illustrated embodiment, the external grip surfaces 30A, 30B are each recessed in a direction perpendicular to the longitudinal axis A with respect to an adjacent portion 32 of 30 the head 28. This facilitates better gripping of the grip surfaces 30A, 30B since the adjacent portions 32 of the head 28 (which the grip surfaces 30A, 30B are recessed with respect to) inhibit fingers or the like from slipping off the grip surfaces 30A, 30B. In the illustrated embodiment, the head 28 projects outwards from the stem 26 in a 35 direction transverse to the longitudinal axis A, which provides a larger internal volume defined by the head 28 than would be possible if the head 28 was of similar width to the stem 26 or smaller. This allows more cells 14 to be contained within the head 28, which increases the capacity of the energy storage module 10. Further, the elongate nature of 09 01 24 the stem 26, when fitted in one of the corresponding sockets 100, 200 provides an effective counterbalance to the larger head 28. In the illustrated embodiment, the head 28 comprises first and second abutment surfaces 5   34A, 43B which are radially spaced apart on the housing 12 with respect to the longitudinal axis A. Each of the first and second abutment surfaces 34A, 34B is arranged to engage a corresponding structure of a corresponding socket 100, 200. For example, Figure 4 illustrates the first abutment surface 34A engaging a first corresponding structure 36A of the socket 100 at the rear of the socket 100 and the second abutment surface 34B 10 engaging a second corresponding structure 36B of the socket 100 at the front of the socket 100. In the illustrated embodiment, the first and second abutment surfaces 34A, 34B are provided at different axial positions along the longitudinal axis A, which provides versatility 15 in fitting to different locations of a surface treatment tool 1000, 2000. Further, this ensures that the energy storage module 10 can only be inserted into the socket 100 in one orientation. Moreover, as best illustrated in Figures 1, 8a and 8b, the energy storage module 10 and socket 100 are shaped so that an opening 102 of the socket 100 is defined by a wall 104 which extends around a portion of the head 28 to meet the first abutment 20 surface 34A. In this way, the energy storage module 10 and socket 100 co-operate to enhance connection / support of the energy storage module 10 in the socket 100. In the illustrated embodiment, the head 28 of the energy storage module 10 and the wall defining the opening of the socket 100 are arranged to be flush with one another, thereby inhibiting accidental disconnection of the energy storage module 10 from the socket 100. 25 In the illustrated embodiment, the first and second abutment surfaces 34A, 34B each extend transverse to the longitudinal axis A for providing a stop surface configured to limit axial insertion of the energy storage module 10 into the socket 100, 200. For example, it is clear from Figure 4 that further axial insertion of the energy storage module 10 into the 30 socket 100 of the first surface treatment tool 1000 is inhibited by the first and second abutment surfaces 34A, 34B abutting against the respective corresponding structures 36A, 36B of the socket. In the illustrated embodiment, the first connection formation 20A is located proximal the 35 first abutment surface 34A and the second connection formation 20B is located proximal the second abutment surface 34B. In this way the first and / or second connection formations 20A, 20B are arranged to be engaged by a respective first or second 09 01 24 complementary formation 22A, 22B to secure the respective abutment surface 34A, 34B against the complementary abutment surface 36A, 36B of the socket 100, 200. As best illustrated in Figure 2, the head 28 has an indicator surface 38 with an indicator 5   40 configured to display a status of the energy storage module 10 (e.g. a charge status). Having such an indicator surface / indicator on the head (i.e. the visible part of the energy storage module) allows a user to view the status of the energy storage module when the energy storage module is connected to a surface treatment tool, e.g. when the surface 10 treatment tool is in use. As best illustrated in Figure 8a, the indicator surface 38 is arranged at an oblique angle to the longitudinal axis A of the energy storage module. In this way, the indicator surface 38 faces approximately upwards (i.e. in the direction of the arrow shown on Figure 8a) when 15 the longitudinal axis A is positioned at an oblique angle with respect to a horizontal floor surface. When connected to the handle of the first surface treatment tool 1000 as illustrated, such an orientation of the energy storage module 10 is typical during normal use. For example, where the first surface treatment tool is a vacuum or scrubber-dryer machine, such an orientation is typical during normal (e.g. forwards and backwards) use 20   of the machine. In this way, a user can easily view the status of the energy storage module 10 when looking down on the surface treatment tool 1000 from above during normal use. It will be understood that the indicator surface 38 is visible to a user both when the energy storage module 10 is connected to a surface treatment tool 1000 via said first releasable 25 latching mechanism 24A (e.g. when connected to the first surface treatment tool 1000) and when the energy storage module is connected to a surface treatment tool via said second releasable latching mechanism 24B (e.g. when connected to the second surface treatment tool 2000). 30 It will be understood that the benefits of the first and second connection formations 20A, 20B for forming first and second latching arrangements 24A, 24B outlined above are particularly applicable when the energy storage module 10 has such an indicator surface 38, since it would not be possible to arbitrarily rotate the energy storage module 10 for inserting in different socket types 100, 200 whilst keeping the indicator surface 38 facing 35 in an appropriate direction for viewing the status of the indicator 40. In the illustrated embodiment, the indicator 40 is an illuminable element adhered to the indicator surface 38, which provides a simple means of providing an indicator without 09 01 24 having to create a substantial aperture within the housing for viewing the indicator. For example, as illustrated in Figure 4, only a small ribbon / cable 41 needs to pass through the housing to connect with the illuminable element 40. This is particularly beneficial when the surface treatment tool is intended for use in wet environments. 5 As best illustrated in Figures 8a and 8b, the head 28 has a rest surface 46 which is curved with respect to the longitudinal axis A, such that the rest surface 46 is configured to rest against a substantially vertical structure 48 (e.g. a wall) when the longitudinal axis A is positioned at an oblique angle with respect to the vertical structure 48. 10 When a user of a surface treatment tool 1000, 2000 wants to break from using the surface treatment tool 1000, 2000, they commonly arrange the surface treatment tool 1000, 2000 such that one end rests against a vertical structure 48 (e.g. a wall) with a longitudinal axis of the surface treatment tool 1000, 2000 arranged at an oblique angle to the vertical 15 structure 48. When the energy storage module 10 is positioned in the socket 100 at the end of the first surface treatment tool 1000 or at another suitable location on a surface treatment tool, such a curved rest surface 46 on the energy storage module 10 provides an area of contact with the vertical structure 48 which inhibits slippage therebetween. This reduces the likelihood of the surface treatment tool 1000 toppling over. 20 In some embodiments, the rest surface 46 is a nonslip surface, for example formed of a non-slip material, such as natural or synthetic rubber. Having a nonslip surface further inhibits slippage between the rest surface 46 and a vertical structure 48 on which it rests, which further reduces the likelihood of the surface treatment tool 1000 toppling over at 25 rest. It will be understood that a nonslip surface may include surface features that increase friction, e.g. a surface roughening, ora nonslip material. In some embodiments, the rest surface 46 is a high-friction surface relative to the remainder of the housing 12. This allows different surface finishes or materials to be used 30 away from the rest surface 46 (e.g. more cost-effective materials, more desirable surface finishes, and / or lower-friction surfaces) whilst reducing the chance of slippage between the rest surface 46 and a vertical structure 48 such as a wall. The rest surface 46 is curved from a first location 50 proximal the stem 26 to a second 35 location 52 distal the stem 26, and an angle between a tangent to the curve and the longitudinal axis A increases from the first location 50 to the second location 52. In comparison to a flat angled rest surface, such a curved rest surface 46 can rest against a vertical structure 48 (e.g. wall) with the energy storage module 10 arranged at a range of 09 01 24 angles with respect to said structure 48, which provides the user with more flexibility around positioning of a surface treatment tool 1000. For example, Figure 8a shows the surface treatment tool 1000 resting with the longitudinal 5 axis of the energy storage module 10 at a comparatively steep angle with respect to the vertical structure 48, whereas Figure 8b shows the surface treatment tool 1000 resting with the longitudinal axis of the energy storage module 10 at a comparatively shallow angle with respect to the vertical structure 48. In both cases, the rest surface 46 provides good contact with the vertical structure 46 by virtue of the curved shape. 10 In alternative embodiments, the rest surface 46 is angled rather than curved. This increases the area of contact when resting at a suitable angle against a vertical structure 46, but decreases the range of rest angles at which the rest surface functions properly. 15 In the energy storage module 110 illustrated in Figure 9, the rest surface 46 is omitted so that a right angle is formed between a side and upper surface of the energy storage module 110. It is apparent when such an energy storage module 110 rests against a vertical structure 48 that the area of contact is reduced in comparison to the rest surface 46 illustrated in Figures 8a, 8b, and therefore there is a higher chance of slippage between 20 the energy storage module 110 and the vertical structure 48 when the rest surface 46 is omitted. As best illustrated in Figure 3, the plurality of cells 14 are arranged within the housing 12 so that some cells 14 are located within the head 28 and some cells are located in the 25 stem 26. Having at least one cell 14 located in the stem 26 (e.g. as opposed to having all cells 14 located within the head 28) distributes the weight of the cells 14 within the housing 12 which balances the weight more evenly during movement of the energy storage module 10 (e.g. during movement of the first or second surface treatment tool 1000, 2000). 30 In the illustrated embodiment, each cell 14 has a longitudinal axis Ac, and the stem 26 includes two cells 14 arranged end-to-end such that the longitudinal axes of the cells 14 are parallel with the longitudinal axis A of the energy storage module 10. Furthermore, the longitudinal axes of the cells 14 are coaxial. Such an arrangement provides an efficient use of space within the stem 26. It will be appreciated that in alternative embodiments, 35 the stem 26 may house more or less than two cells 14. In the illustrated embodiment, a plurality of cells 14 are arranged in the head 28 such that the longitudinal axes of the cells 14 are transverse to the longitudinal axis A of the energy 09 01 24 storage module 10. Such an arrangement provides an efficient use of space within the head 28. Furthermore, the longitudinal axes of the cells 14 are parallel to each other. In some embodiments, the number of cells 14 in the head 28 is greater than the number 5 of cells 14 in the stem 26. For example, in the illustrated embodiment there are five cells 14 in the head 28. It will be appreciated that in alternative embodiments, the head 28 may house more or less than five cells 14. When there are two or more cells 14 in the stem 26 arranged end-to-end and the number of cells 14 in the head 28 is greater than the number of cells 14 in the stem 26 (e.g. in particular when the head 28 contains five 10 cells), this arrangement of cells 14 has been found to provide good balance of weight within the energy storage module 10. In some embodiments, the stem 26 has a cross-section having a poka-yoke shape to inhibit incorrect insertion of the stem 26 into a corresponding socket 100, 200. For 15 example, as illustrated in Figure 5, the stem 26 has rails 54 for engagement with corresponding linear projections (not shown) inside the sockets 100, 200. In other embodiments, the stem 26 has a cross-section with different shaped opposing edges (e.g. a D-shape). Such poka-yoke shapes prevent the stem 26 from being inserted the wrong way round into a socket 100, 200. 20 In the illustrated embodiment, the energy storage module 10 is configured to be charged via the same power terminal 16 used for transferring power from the energy storage module 10 to the first or second surface treatment tool 1000, 2000. The power terminal 16 is located on the stem 26 so that it is not externally accessible when the energy storage 25 module 10 is attached to the first or second surface treatment tool 1000, 2000, i.e. via the first or second connection formation 20A, 20B. Therefore, the energy storage module 10 is configured to be removed from the first or second surface treatment tool 1000, 2000 and coupled to a charger (not shown) with a 30 similar socket such that the power terminal 16 receives power from the charger to recharge the cells 14. In alternative embodiments, the energy storage module includes a separate power terminal for charging, optionally which is externally accessible when the energy storage 35 module 10 is attached to the first or second surface treatment tool 1000, 2000 (e.g. a power terminal located on the head 28). Although the invention has been described in relation to one or more embodiments, it will be appreciated that various changes or modifications can be made without departing from the scope of the invention as defined in the appended claims. For example, although the energy storage module 10 has been described in use with a surface treatment tool, it will 5 be appreciated that the energy storage module 10 may be configured for use with any type of tool. It will be appreciated that a single tool may be provided with a single socket associated with both first and second complementary connection formations. For example, both the first and second latching mechanisms may be used together to connect the energy storage module to the single socket. In this way, a more robust connection mechanism 10 may be provided. Alternatively, a single tool may be provided with a first socket associated with the first complementary connection formation and a second socket associated with the second complementary connection formation. It should also be noted that whilst the appended claims set out particular combinations of 15 features described above, the scope of the present disclosure is not limited to the particular combinations hereafter claimed, but instead extends to encompass any combination of features herein disclosed. CXI

Claims

1. An energy storage module for use with a surface treatment tool such that the energy storage module is configured to transmit power to said surface treatment tool when in5 use, comprising:a housing containing one or more energy storage cells;a power terminal in electrical communication with the one or more cells and configured to transmit power to said surface treatment tool; anda connection arrangement provided on the housing and configured to releasably10 secure the energy storage module to said surface treatment tool;wherein the connection arrangement comprises a first connection formation and a second connection formation, wherein the first connection formation is configured to form a first releasable latching mechanism with a first complementary formation of a first surface treatment tool, and wherein the second connection formation is configured to form15 a second releasable latching mechanism with a second complementary formation of said first and / or a second surface treatment tool;wherein the housing comprises a stem configured to be received within a socket of said surface treatment tool and a head configured such that at least a portion of the head is visible when in use, wherein the energy storage module comprises a longitudinal axis20 and the stem is elongate along the longitudinal axis, and wherein the head projects outwards from the stem in a direction transverse to the longitudinal axis;wherein the head comprises first and second abutment surfaces radially spaced apart on the housing with respect to the longitudinal axis, wherein the first and / or second abutment surface is arranged to engage a corresponding structure of the socket, and25 wherein the first and second abutment surfaces are provided at different axial positions along the longitudinal axis; andwherein the first connection formation is located proximal the first abutment surface and the second connection formation is located proximal the second abutment surface.

302. The energy storage module of claim 1, wherein the head is configured to be at least partially external to said socket when in use.

3. The energy storage module of claim 2, wherein the head comprises a pair of external 35 grip surfaces which face different directions so that a user can grip the head via the external grip surfaces.09 01 244. The energy storage module of claim 3, wherein the external grip surfaces extend over at least 10%, optionally at least 15%, of a length of the energy storage module, wherein the length extends along the longitudinal axis.5   5. The energy storage module of claim 3 or 4, wherein the external grip surfaces aresubstantially planar, e.g. substantially parallel to each other.

6. The energy storage module of claim 3, 4 or 5, wherein the external grip surfaces are each recessed in a direction transverse (e.g. perpendicular) to the longitudinal axis 10 with respect to an adjacent portion of the head.

7. The energy storage module of any preceding claim, wherein the head comprises an indicator surface comprising an indicator configured to display a status of the energy storage module (e.g. a charge status).

158. The energy storage module of claim 7, wherein the stem is elongate along the longitudinal axis, and wherein the indicator surface is arranged at an oblique angle to the longitudinal axis.20   9. The energy storage module of claim 7 or 8, wherein the indicator surface is visible to auser when the energy storage module is connected to a surface treatment tool via said first releasable latching mechanism and / or when the energy storage module is connected to a surface treatment tool via said second releasable latching mechanism.25   10. The energy storage module of any preceding claim, wherein the head comprises a restsurface which is curved or angled with respect to said longitudinal axis, such that the rest surface is configured to rest against a substantially vertical structure when the longitudinal axis is positioned at an oblique angle with respect to the vertical structure.30   11. The energy storage module of claim 10, wherein the rest surface is configured to restagainst a substantially vertical structure when the energy storage module is secured to said surface treatment tool via the first latching mechanism and / or when the energy storage module is secured to said surface treatment tool via the second latching mechanism.09 01 2412. The energy storage module of any of claims 10 or 11, wherein the rest surface comprises a nonslip surface, for example a non-slip material, such as natural or synthetic rubber.5   13. The energy storage module of any of claims 10 to 12, wherein the rest surfacecomprises a high-friction surface relative to the remainder of the housing.

14. The energy storage module of any of claims 10 to 13, wherein the rest surface is curved from a first location proximal the stem to a second location distal the stem, wherein 10 an angle between a tangent to the curve and the longitudinal axis increases from the first location to the second location.

15. The energy storage module of any preceding claim, wherein the housing contains a plurality of cells, wherein at least one cell is located within the head and at least one cell 15 is located in the stem.

16. The energy storage module of claim 15, wherein each cell comprises a longitudinal axis, and wherein the stem comprises two or more cells arranged end-to-end such that the longitudinal axes of said cells is parallel with the longitudinal axis of the energy storage 20 module.

17. The energy storage module of claim 15 or 16, wherein each cell comprises a longitudinal axis, and wherein the head comprises a plurality of cells arranged such that the longitudinal axes of said cells is transverse to the longitudinal axis of the energy 25 storage module.

18. The energy storage module of any of claims 15 to 17, wherein the number of cells in the head is greater than the number of cells in the stem.30   19. The energy storage module of any of claims 15 to 18, wherein the plurality of cells ofthe head are arranged side-to-side.

20. The energy storage module of any of claims 15 to 19, wherein the head comprises five cells.

21. The energy storage module of any preceding claim, wherein the stem comprises a cross-section having a poka-yoke shape to inhibit incorrect insertion of the stem into acorresponding socket; optionally, wherein the stem comprises rails or liner projections for engagement with corresponding linear projections or rails of said socket.

22. A system comprising the energy storage module of any preceding claim and a surface 5 treatment tool configured to receive the energy storage module.

23. The system of claim 22, wherein the surface treatment tool comprises the first complementary formation for forming the first latching mechanism with the first connection formation of the energy storage module and / or wherein the surface treatment 10 tool comprises the second complementary formation for forming the second latching mechanism with the second connection formation of the energy storage module.

24. The system of claim 22 or 23, wherein the surface treatment tool comprises a first surface treatment tool, the first surface treatment tool comprising the first complementary 15 formation for forming the first latching mechanism with the first connection formation of the energy storage module, and wherein the system comprises a second surface treatment tool comprising the second complementary formation for forming the second latching mechanism with the second connection formation of the energy storage module.'20   25. The system of claim 23 or 24, wherein the surface treatment tool comprises amotorised scrubber, wet-scrubber, scrubber-dryer, a spraying device or other cleaning O) tool.

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