FR3073990A1 - ELECTRONIC DEVICE FOR LOADING A PLURALITY OF EXTERNAL BATTERIES FOR MOBILE TERMINAL, ELECTRONIC ASSEMBLY COMPRISING A PLURALITY OF EXTERNAL BATTERIES AND A SUCH CHARGING DEVICE - Google Patents

Abstract

This electronic loading device (12) of a plurality of external mobile battery (14), each external battery (14) being configured to supply electrical power to a respective mobile terminal, comprises: - an electric charging module (28) ) configured to electrically charge the plurality of external batteries (14); - a receiving medium (32) configured to receive the plurality of external batteries (14), each external battery (14) being, during its electrical charging, intended to be in abutment against the receiving medium (32); and a plurality of first electrical connectors configured to cooperate with a plurality of second electrical connectors by pressing the plurality of external batteries (14) against the receiving medium (32), for charging the plurality of external batteries (14). ), each external battery (14) having a respective second electrical connector.

Description

Electronic device for charging a plurality of external batteries for a mobile terminal, electronic assembly comprising a plurality of external batteries and such a charging device

The present invention relates to an electronic device for charging a plurality of external batteries for a mobile terminal, each external battery being configured to supply electrical energy to a respective mobile terminal.

The present invention also relates to an electronic assembly comprising a plurality of external batteries for mobile terminal and such an electronic charging device configured to electrically charge said plurality of external batteries.

An electronic loading device of the aforementioned type is known. Such a charging device is in the form of an electric charger comprising several ports, such as USB (from the Universal Serial Bus) ports, for the simultaneous recharging of a plurality of external batteries for a mobile terminal. Each external battery is then connected to the electric charger via an electric cable, such as a respective USB cable. Each external battery then makes it possible to supply electrical energy to a mobile terminal, such as a mobile phone or an electronic tablet.

However, with such a charging device, the electrical recharging of this plurality of external batteries is tedious.

The object of the invention is therefore to propose an electronic charging device making it possible to facilitate the electrical charging / recharging of the plurality of external batteries for mobile terminal.

To this end, the subject of the invention is an electronic device for charging a plurality of external batteries for a mobile terminal, each external battery being configured to supply electrical energy to a respective mobile terminal, the device comprising:

- an electric charging module configured to electrically charge the plurality of external batteries;

a reception support configured to receive the plurality of external batteries, each external battery being, when it is electrically charged, intended to be in abutment against the reception support; and

- A plurality of first electrical connectors configured to cooperate with a plurality of second electrical connectors by pressing the plurality of external batteries against the receiving support, for the electrical charging of the plurality of external batteries, each external battery comprising a second electrical connector respective.

With the electronic charging device according to the invention, the electrical charging of the plurality of external batteries is then greatly facilitated, since it suffices simply to place the plurality of external batteries in abutment against the receiving support.

The plurality of first electrical connectors equipping the charging device then cooperates with the plurality of second electrical connectors equipping the external batteries, by a simple pressing of the plurality of external batteries against the receiving support, for the electrical charging of the plurality of batteries external, in the absence of an electrical cable connection between each external battery and the charging device.

Those skilled in the art will understand that the electrical charging of the plurality of external batteries is carried out simply without having to connect an electric cable between each external battery and the charging device, while not being a contactless charging. Contactless charging, i.e. charging by induction, has a number of drawbacks, including lower electrical efficiency and the need for a large surface area between the external battery and the charging device.

According to other advantageous aspects of the invention, the electronic loading device comprises one or more of the following characteristics, taken in isolation or in any technically possible combination:

each mobile terminal is a multimedia terminal, each mobile terminal preferably being chosen from the group consisting of: a mobile telephone and an electronic tablet;

each first electrical connector is mounted mobile between a rest position in which the external battery is away from the reception support and a contact position in which the external battery is charged in contact with the reception support, and each first electrical connector is provided with a first return spring from its contact position towards its rest position, each first electrical connector preferably being made of brass coated with a layer of gold, each first electrical connector advantageously comprising at least one electrical connection pin;

- The reception support comprises at least a first magnetic element, each first magnetic element being able to cooperate magnetically with a second magnetic element equipping a respective external battery to maintain said external battery during its charging;

- the maximum amount of electrical energy capable of being delivered by the charging device to each external battery is greater than 2000 mAh, preferably greater than 2750 mAh;

- The electronic loading device has a support surface intended to be in contact with a frame supporting said electronic loading device, and the electrical loading module is inclined relative to the support surface to define a circulation channel d air between the electric charging module and the frame; and

- The electronic charging device comprises at least one positioning notch configured to cooperate with a respective external battery.

The invention also relates to an electronic assembly comprising a plurality of external batteries for mobile terminal and an electronic charging device configured to electrically charge said plurality of external batteries, each external battery being configured to supply electrical energy to a respective mobile terminal, the electronic loading device being as defined above.

According to other advantageous aspects of the invention, the electronic assembly includes one or more of the following characteristics, taken in isolation or in any technically possible combination:

- At least a second electrical connector is in the form of a contact pad configured to be in contact with a respective first electrical connector in the form of a pin, the second electrical connector preferably being covered with nickel;

each external battery has a receiving surface intended to be in contact with a bearing face of the mobile terminal, and a third electrical connector for supplying electrical energy to the corresponding mobile terminal, each third connector being mounted to rotate relative to the surface receiving, each external battery preferably comprising a second return spring from the third connector to the receiving surface;

each external battery comprises a control module configured to send a request to the corresponding mobile terminal to find out a maximum current admissible by said terminal, then to control the supply of electrical energy to the mobile terminal with a current having a value less than or equal to said maximum allowable current; and

- Each external battery includes a control button configured to control the supply of electrical energy to the respective mobile terminal, the control button preferably being configured to also control the display of a state of charge of the external battery.

These characteristics and advantages of the invention will appear more clearly on reading the description which follows, given solely by way of nonlimiting example, and made with reference to the appended drawings, in which:

- Figure 1 is a perspective view of an electronic assembly comprising a plurality of external batteries for mobile terminal, and an electronic device for charging said plurality of batteries according to a first embodiment of the invention;

- Figure 2 is a view similar to that of Figure 1, where the external batteries have not been shown;

- Figure 3 is a top view of an external battery of Figure 1;

- Figure 4 is a bottom view of the external battery of Figure 3;

- Figure 5 is a rear view of the external battery of Figure 3;

- Figure 6 is a block diagram of the electronic device according to the first embodiment of the invention;

- Figure 7 is a block diagram of the external battery;

- Figure 8 is a view similar to that of Figure 2 according to a second embodiment of the invention; and

- Figure 9 is a block diagram of the electronic device according to the second embodiment of the invention.

In the remainder of the description, the expression “substantially equal to” defines a relationship of equality at plus or minus 10%, preferably at plus or minus 5%.

Referring to Figure 1, an electronic assembly 10 comprises an electronic charging device 12, and a plurality of external batteries 14 for mobile terminal.

The electronic charging device 12 is configured to electrically charge the plurality of external batteries 14.

Each external battery 14 is configured to supply electrical energy to a respective mobile terminal, not shown.

Each mobile terminal is for example a multimedia terminal, such as a mobile phone or an electronic tablet. The mobile phone is, for example, of the "iPhone" type manufactured by the Apple company. The electronic tablet is, for example, of the "iPad" type manufactured by the Apple company.

According to a first embodiment of the invention, as illustrated in FIGS. 1 and 2, the charging device 12 is capable of simultaneously charging up to three external batteries 14. According to a second embodiment of the invention , as illustrated in FIG. 8, the charging device 12 is capable of simultaneously charging up to seven external batteries 14. Those skilled in the art will of course understand that the invention also relates to other embodiments where the number N of external batteries 14 capable of being charged simultaneously by the charging device 12 differs from 3 or 7, N being generally an integer greater than or equal to 2.

The loading device 12 comprises a protective casing 16, the casing 16 comprising an upper wall 18, a lower wall 19 disposed opposite the upper wall 18, and a lateral edge 20 between the lower wall 19 and the upper wall 18. The lower wall 19 extends substantially parallel to the upper wall 18, and comprises a lower end edge 21. The protective housing 16 also includes a support flange 22, forming an angle a with the upper walls 18 and lower 19. The value of the angle a is for example between 60 ° and 120 °, preferably between 90 ° and 120 °. The supporting rim 22 comprises a lower edge 23, and an upper edge 24 connecting the support rim 22 to the upper and lower walls 18, 19. The lower end edge 21 and the lower edge 23 of the support rim 22 define a bearing surface 26 intended to be in contact with a frame 27 supporting the loading device 12. The frame 27 is for example a table, or a desk. In one configuration, the frame 27 has a substantially horizontal surface. In another configuration, the frame 27 has a surface inclined relative to a horizontal plane, such as a vertical surface.

The charging device 12 also includes an electrical charging module 28 disposed inside the housing 16, between the upper wall 18 and the lower wall 19. The charging module 28, visible in FIG. 6, is configured to charge electrically the external batteries 14. The loading module 28 defines, with the bearing surface 26, an air circulation channel 30 between the charging module 28 and the frame 27. The air circulation channel 30 allows in particular a better air circulation between the loading module 28 and the frame 27, thus ensuring better cooling of the loading module 28 during its operation.

The charging device 12 also includes a reception support 32 configured to receive the external batteries 14. When it is loaded, each external battery 14 is intended to be pressed against the reception support 32. The reception support 32 is for example integral with the upper wall 18. The electrical charging of the external batteries 14 is effected by pressing the external batteries 14 against the receiving support 32, ie an electrical connection between the external batteries 14 and the charging module 28 has place only when the external batteries 14 are in abutment against the reception support 32.

As shown in FIGS. 2 and 8, the charging device 12 comprises a plurality of first electrical connectors 34, each first connector 34 being configured to cooperate with a second connector 36 fitted to a respective external battery 14 during the charging of each external battery 14 .

The loading device 12 further comprises at least one positioning notch 40, or else a positioning stop, configured to cooperate with a respective external battery 14. This positioning means 40 makes it possible to maintain each external battery 12 in a charging position on the reception support 32. This ensures good electrical coupling of the external batteries 14 in particular of the second connectors 36, with the respective first connectors 34.

Each external battery 14 comprises a respective second electrical connector 36 configured to cooperate with a corresponding first connector 34, for the electrical charging of said external battery 14.

Each external battery 14 comprises a reception surface 44 intended to receive the mobile terminal and to be in contact with a bearing face of the mobile terminal, a rear wall 45 disposed opposite the reception surface 44, and a lateral edge 46 .

Each external battery 14 also includes a third electrical connector 48, configured to supply electrical energy to the corresponding mobile terminal. The third connector 48 is configured to cooperate with a complementary connector, not shown, fitted to the mobile terminal. The third connector 48 is for example a male plug configured to be plugged into a female socket fitted to the mobile terminal for the electrical charging of said mobile terminal.

Each external battery 14 is configured to deliver, to a corresponding mobile terminal, a maximum current having a value greater than 1.5 A, preferably greater than 2 A, and preferably greater than 2.1 A.

In addition, each external battery 14 comprises a second return spring, not shown, for each respective third connector 48. The second return spring is configured to exert a return force on the third connector 48 to the receiving surface 44. The second spring also makes it possible to exert a pressing force on the mobile terminal against the receiving surface 44 during the charging the terminal, thereby reducing the risk of slipping between the mobile terminal and the external battery 14.

Each external battery 14 also comprises a control module 50 configured to send a request to the mobile terminal which is connected to the external battery 14 in order to know the maximum current admissible by said mobile terminal. The control module 50 is also configured to control the electric power supply to the mobile terminal with a current having a value less than or equal to the maximum current admissible by the mobile terminal. This automatically limits the charging current and prevents damage by overloading the mobile terminal.

In optional addition, each external battery 14 comprises a charge indicator 52 configured to display a state of charge of the external battery 14. The charge indicator 52 comprises for example several light-emitting diodes 54, visible in FIG. 4.

Referring to Figure 5, each external battery 14 further comprises a control button 56, arranged for example in the rear wall 45. The control button 56 is configured to control the supply of electrical energy for each respective mobile terminal.

The upper wall 18 is disposed in an inclined manner with respect to the bearing surface 26, which makes it possible to limit an accumulation of dust on the top of the loading device 12.

The charging module 28 is capable of delivering an amount of energy greater than 2000 mAh to each external battery 14. Preferably, the charging module 28 is capable of delivering an amount of energy greater than 2750 mAh, advantageously greater than 3000 mAh to each external battery 14.

The reception support 32 comprises at least a first magnetic element 58, visible in FIG. 2. As visible in FIG. 1, each first magnetic element 58 is able to cooperate magnetically with a second magnetic element 60 fitted to a corresponding external battery 14 for maintain said external battery 14 in position when it is charged by the charging device 12. This allows a simplified and safe charging between the external batteries 14 and the charging device 12, in particular in the event of slight vibrations applied to the external batteries 14 and / or the loading device 12.

Each first connector 34 is movable between a rest position, visible in FIGS. 2 and 9, and a contact position corresponding to FIG. 1. When the first connector 34 is in the rest position, the corresponding external battery 14 is at separation from the reception support 32 and the external battery 14 is not charged by the charging device 12. When the first connector 34 is in the contact position, the corresponding external battery 12 is in abutment against the reception support 32 and the external battery 14 is then able to be charged by the charging device 12.

In the example of FIGS. 2 and 8, each first connector 34 has at least one pin 62 projecting from the receiving support 32. In the example shown in FIG. 2, each first connector 34 has two pins 62. Each first connector 34 preferably comprises exactly two pins 62, each pin 62 corresponding to a respective polarity of the supply current of the corresponding external battery 14, such as direct current, also called DC current (from Direct English) , supplying said external battery 14.

The first connectors 34 are preferably made of brass coated with a layer of gold. This allows a good electrical connection between the external battery 14 and the reception support 32.

Each first connector 34 is provided with a first return spring, not shown. The first spring is configured to exert a restoring force from the first connector 34 to its rest position, so that the first connector 34 returns from its contact position to its rest position. This improves the electrical contact between the external batteries 14 and the charging device 12.

In the example of FIGS. 3 and 4, each second connector 36 comprises a contact pad 64. Each second electrical connector 36 comprises for example two contact pads 64. Each second electrical connector 36 preferably comprises exactly two contact pads, each contact pad 64 corresponding to a respective polarity of the supply current of the corresponding external battery 14, such as direct current, or DC current (from the English Direct Current), supply of said external battery 14. Each contact pad 64 is configured to be in contact with a respective pin 62 of the first corresponding connector 34. The second connector 36 is preferably covered with nickel.

As a variant, not shown, each first connector 34 comprises at least one contact pad, and each second connector 36 comprises at least one contact pin capable of cooperating with a respective pad of the first connector 34.

The receiving surface 44 has a substantially planar shape capable of cooperating with a mobile terminal.

The lateral edge 46 is provided with the second magnetic element 60. Each second magnetic element 60 is configured to cooperate magnetically with the respective first magnetic element 58 to maintain the position of the external battery 14 during its charging. The cooperation between the first and second magnetic elements 58, 60 is achieved by the attraction between two opposite magnetic poles.

As shown in FIG. 3, each third connector 48 is mounted to rotate relative to the receiving surface 44. The third connector 48 is for example movable in rotation relative to an axis of rotation R, substantially parallel to the receiving surface 44 , the axis of rotation R preferably being substantially parallel to a lower edge 66 of the receiving surface 44. This rotational mobility of the third connector 48 allows each third connector 48 to adapt to a thickness of terminal different from one mobile terminal to another.

In optional addition, the control button 56 is also able to further control the display of the state of charge of the external battery 14 via the charge indicator 52.

Advantageously also, the control button 56 is also capable of interrupting the electrical charging of a mobile terminal by the external battery 14.

Figure 6 is a block diagram of the loading module 28 according to the first embodiment of the invention. The charging module 28 has a first input 70 configured to receive an electrical supply, such as a mains supply from an electrical network for the charging device 12, three first converters 72 each configured to convert the electrical voltage received into the first input 70 at an output voltage supplied at a respective first output 74.

The first input 70 is configured to receive a DC voltage, said first input 70 then preferably being connected to the electrical network via a transformer, not shown. The DC voltage value at the first input 70 is for example between 8V and 15 V, and preferably substantially equal to 12 V.

The first converter 72 is capable of lowering the electrical voltage received at the first input 70. The first converter 72 is for example configured to lower the electrical voltage to a direct output voltage between 3 V and 7 V, advantageously substantially equal to 5 V.

Each first output 74 is configured to be electrically connected to a respective first connector 34 to provide the corresponding power supply to each respective external battery 14.

FIG. 7 is a block diagram of the external battery 14. The external battery 14 comprises a second input 76 electrically connected to the second connector 36, a protection module 78 configured to protect the external battery 14, an internal element 80 for storing electrical energy, the control module 50, a second converter 82, and a second output 84 electrically connected to the third connector 48.

The protection module 78 is configured to protect the elements of the external battery 14 which are downstream from it, with respect to a current flowing from the second input 76 to the second output 84, against an overvoltage, and / or an under- voltage, and / or an overcurrent from the charging device 12. The overvoltage corresponds for example to an electric voltage coming from the charging device 12 greater than 4.2 V. The undervoltage corresponds for example to an electric voltage from the charging device 12 less than 3 V. The overcurrent corresponds for example to an electric current coming from the charging device 12 greater than 5 A.

The internal electrical energy storage element 80 is configured on the one hand, to receive electrical energy supplied by the charging device 12, and on the other hand to supply electrical energy to the mobile terminal via the second output. 84. The electrical voltage at the output of the internal electrical energy storage element 80 is for example between 3.3 V and 3.7 V.

The second converter 82 is configured to convert the voltage at the output of the internal electrical energy storage element 80 into the voltage delivered at the second output 84. The second converter 82 is for example configured to increase the DC voltage up to substantially 5V.

In addition, the second converter 82 is further able to supply electrical power to the mobile terminal with a substantially constant electrical power. More specifically, during the loading of a mobile terminal by the internal electrical energy storage element 80, the output voltage supplied to the mobile terminal tends to decrease. The second converter 82 is then able to increase the electric current so as to maintain a substantially constant electric charging power at the second output 84.

In operation, when a user wishes to charge a respective external battery 14, he places it on the receiving support 32 so that the external battery 14 cooperates with the positioning notch 40. At the same time, the first magnetic element 58 cooperates with the second magnetic element 60 so as to hold the external battery 14 against the receiving support 32.

In doing so, the first connector 34 cooperates with the second connector 36. The second connector 36 is supported on the first connector 34 which then moves from its rest position to its contact position. The first return spring exerts a return force on the first connector 34 towards its rest position, thus ensuring better electrical contact between the charging device 12 and the external battery 14 during the electric charging of the external battery 14.

The charging module 28 then automatically charges the external battery 14 until it is fully charged.

When a user wishes to use the external battery 14 to charge a mobile terminal, he exerts a withdrawal force on the battery 14 oriented away from the charging device 12. Under the effect of this force, the first magnetic element 58 ceases to cooperate with the second magnetic element 60, and the external battery 14 is withdrawn from the reception support 32.

Then, the user approaches the mobile terminal towards the receiving surface 44 of the external battery 14 until the bearing face of the mobile terminal comes into contact with the receiving surface 44. The user then couples the third connector 48 with the complementary connector of the mobile terminal. The third connector 48 being rotatably mounted relative to the receiving surface 44, the third connector 48 is able to adapt to different thicknesses of mobile terminal, especially when the terminal is provided with a protective shell increasing its overall thickness.

The second return spring exerts a return force on the mobile terminal towards the receiving surface 44. The friction force between the external battery 14 and the mobile terminal then increases, which reduces the risk of slipping between the external battery 14 and the terminal when it is loaded.

Then, the user presses the control button 56 to initiate the charging of the mobile terminal by the external battery 14. Thanks to the control module 50, the external battery 14 acquires the value of the maximum current admissible by the mobile terminal, then sends a charging current less than or equal to said maximum admissible current. This allows rapid charging, while avoiding an electrical overload of the mobile terminal.

Once the mobile terminal is charged, the user removes the mobile terminal from the external battery 14. The user then presses the control button 56 for a duration greater than a predefined duration, for example equal to 30 seconds, to switch off the external battery 14. This avoids unnecessary and accidental discharge of the external battery 14 when it is not being charged from a mobile terminal.

The charging device 12 according to the invention then makes it possible to simplify the electrical charging of each external battery 14. In particular, unlike the charging device of the prior art, it is no longer necessary to use a cable to connect the external battery 14 to the charging device 12 for electrical charging. It is also not necessary to use a cable to connect the mobile terminal to the external battery to charge the mobile terminal.

In addition, the control module allows automatic detection of the maximum admissible current by the terminal, and to adapt the charging current accordingly.

Figures 8 and 9 illustrate a second embodiment of the invention for which the elements identical to those of the first embodiment described above are identified by identical references.

According to this second embodiment, the charging device 12 is capable of simultaneously charging up to seven external batteries 14. The second embodiment differs from the first embodiment in that the charging device 12 comprises seven first connectors 34, instead of the first three connectors 34 according to the first embodiment.

FIG. 9 represents a block diagram of the loading device 12 according to the second embodiment of the invention. This diagram differs from that of the first embodiment in that the loading device 12 has two first inputs 70 instead of one, and first seven converters 72 instead of three. Among these first seven converters 72, three first converters 72 are connected to one of the first two inputs 70, and four first converters 72 are connected to the other of the first two inputs 70.

Those skilled in the art will understand that the operation of this second embodiment of the invention is similar to that of the first embodiment described above.

Those skilled in the art will understand that the advantages of this second embodiment of the invention are similar to those of the first embodiment described above.

It is thus understood that the electronic charging device 12 according to the invention makes it possible to facilitate the electrical charging / recharging of the plurality of external batteries 14 for mobile terminal whatever the embodiment considered, and whatever the number N of batteries external 14 capable of being charged simultaneously by the charging device 12.

Claims (12)

1. Electronic device for charging (12) a plurality of external batteries (14) for a mobile terminal, each external battery (14) being configured to supply electrical energy to a respective mobile terminal, the device (12) comprising: - an electric charging module (28) configured to electrically charge the plurality of external batteries (14); - a reception support (32) configured to receive the plurality of external batteries (14), each external battery (14) being, when it is electrically charged, intended to be in abutment against the reception support (32); and - a plurality of first electrical connectors (34) configured to cooperate with a plurality of second electrical connectors (36) by pressing the plurality of external batteries (14) against the receiving support (32), for the electrical charging of the plurality of external batteries (14), each external battery (14) comprising a respective second electrical connector (36). 2. Electronic charging device (12) according to claim 1, in which each mobile terminal is a multimedia terminal, each mobile terminal preferably being chosen from the group consisting of: a mobile telephone and an electronic tablet. 3. electronic charging device (12) according to claim 1 or 2, wherein each first electrical connector (34) is mounted movable between a rest position in which the external battery (14) is away from the receiving support (32) and a contact position in which the external battery (14) is charged on contact with the receiving support (32), and each first electrical connector (34) is provided with a first spring to return to its position contact to its rest position, each first electrical connector (34) preferably being made of brass coated with a layer of gold, each first electrical connector (34) advantageously comprising at least one electrical connection pin. 4. Electronic charging device (12) according to any one of claims 1 to 3, in which the receiving support (32) comprises at least a first magnetic element (58), each first magnetic element (58) being able to cooperate magnetically with a second magnetic element (60) equipping a 14 respective external battery (14) for maintaining said external battery (14) during charging. 5. Electronic charging device (12) according to any one of claims 1 to 4, in which the maximum quantity of electrical energy capable of being delivered by the charging device (12) to each external battery (14) is greater. at 2000 mAh, preferably greater than 2750 mAh. 6. electronic loading device (12) according to any one of claims 1 to 5, wherein the electronic loading device (12) has a bearing surface (26) intended to be in contact with a frame (27) supporting said electronic charging device (12), and the electric charging module (28) is inclined relative to the bearing surface (26) to define an air circulation channel (30) between the electric charging module (28) and the frame (27). 7. electronic charging device (12) according to any one of claims 1 to 6, wherein the electronic charging device (12) comprises at least one positioning notch (40) configured to cooperate with an external battery (14) respectively. 8. Electronic assembly (10) comprising a plurality of external batteries (14) for a mobile terminal and an electronic charging device (12) configured to electrically charge said plurality of external batteries (14), each external battery (14) being configured to supplying electrical power to a respective mobile terminal, characterized in that the electronic charging device (12) is according to any one of the preceding claims. 9. Electronic assembly (10) according to claim 8, in which at least a second electrical connector (36) is in the form of a contact pad configured to be in contact with a respective first electrical connector (34) in the form of a pin. , the second electrical connector (36) preferably being covered with nickel. 10. Electronic assembly (10) according to claim 8 or 9, wherein each external battery (14) comprises a receiving surface (44) intended to be in contact with a bearing face of the mobile terminal, and a third electrical connector (48) for 15 supplying electrical power to the corresponding mobile terminal, each third connector (48) being rotatably mounted relative to the receiving surface (44), each external battery (14) preferably comprising a second return spring from the third connector to the surface reception. 11. Electronic assembly (10) according to any one of claims 8 to 10, in which each external battery (14) comprises a control module (50) configured to send a request to the corresponding mobile terminal to know a maximum current admissible by said terminal, then to control the supply of electrical energy to the mobile terminal with a current having a value less than or equal to said maximum admissible current. 12. Electronic assembly (10) according to any one of claims 8 to 11, in which each external battery (14) comprises a control button (56) configured to control the supply of electrical energy to the respective mobile terminal, the button The control panel (56) is preferably configured to further control the display of a state of charge of the external battery (14).