HK1222041B - Smart battery with a supply voltage control circuit and method for manufacturing the battery - Google Patents

Description

Smart battery with supply voltage control circuit and method for manufacturing the same

Technical Field

The invention relates to a smart battery having a circuit for controlling a supply voltage.

The invention also relates to a method for manufacturing a smart battery.

Background

In smart battery designs, electronic power supply voltage control circuits are integrated into the battery structure. The circuit may include an end of life detector (EOL), an oscillator stage, a power control unit, or a communication interface. The circuit further includes a DC-DC converter between the external positive terminal and the internal positive terminal. The DC-DC converter is powered continuously or when the power supply voltage is near or equal to an end of battery life threshold (EOL). This may be a boost converter or a buck converter. This may extend battery life while providing sufficient supply voltage above a minimum limit. The battery may also be of a rechargeable type.

As mentioned above, reference may be made to us patent 6,298,250B1, which discloses a smart battery or cell of this type comprising a controller circuit. The control circuit is connected to the battery core or the battery power supply terminal. The control circuit makes it possible to extend the battery life. To accomplish this, the controller circuit includes a DC-DC converter clocked by an oscillator to convert the battery or cell voltage to an output voltage, which may be higher than a cutoff voltage or battery end-of-life voltage. The converter may be activated once the battery voltage reaches the battery end-of-life voltage threshold in order to extend battery life.

According to fig. 5B of US 6,198,250B1, the controller circuit is connected in a central position to the rear cover of the battery, which forms the negative terminal of the battery, and to an electrochemical substance, which defines the negative electrode. The control circuit is connected via input terminals to an electrochemical mass defining an internal positive electrode by means of electrical connection tabs. The control circuit is connected by an output terminal to a wall defining an external positive battery terminal by means of another electrical connection tab. It is also necessary to provide an insulator between the controller circuitry and the electrochemical substance. The arrangement of the control circuit in the battery structure takes up a relatively large space, which constitutes a disadvantage. This arrangement of the control circuit does not easily allow it to be arranged in a battery of smaller size, that is to say in a battery of smaller size than the AAA battery.

Disclosure of Invention

It is therefore an object of the present invention to provide a smart battery having an electronic module with an electronic power supply voltage control circuit and capable of being adapted to a battery having a small-sized conventional structure.

For this purpose, the invention relates to a smart battery with an electronic module with an electronic supply voltage control circuit, comprising the features mentioned in the independent claim 1.

Particular embodiments of the smart battery are defined in the dependent claims 2 to 24.

One advantage of smart batteries is the fact that all electronics can be integrated in a standard battery structure of small size. The printed circuit board carrying the circuit has conductive paths only on the first side, and the second insulating side can be fastened to one or other chemicals.

Advantageously, the one or more first electrical connection pad connection circuits are connected from the output terminals to the one or more first electrical connection pad connection circuits by one or more conductive paths on the first side of the printed circuit board. The first connection pad(s) are preferably directly connected to the cup as external positive battery terminals. The circuit is also connected to both chemicals via electrically conductive paths by means of one or more second and third connection pads. Preferably, the second attachment pad is placed on a tab of the bracket heel that is fixed to the insulating bracket, and the third attachment pad is placed on a tab folded 180 ° and attached to another tab of the second chemical. The second connection pad contacts an inner wall of the cap connected to the first chemical.

For this purpose, the invention therefore relates to a method for manufacturing a smart battery comprising the features defined in independent claim 25.

Particular steps of the manufacturing method are defined in the dependent claims 26 to 30.

Drawings

The objects, advantages and features of a smart battery having an electronic module with an electronic supply voltage control circuit and a method for manufacturing a smart battery will become clearer based on the following description of at least one non-limiting embodiment illustrated by the attached drawings, in which:

fig. 1 shows a simplified view of a device of a smart battery with an electronic supply voltage control circuit according to the present invention.

Fig. 2a and 2b show diametric cross-sectional views of a smart battery according to the invention once assembled or in exploded view.

FIGS. 3a and 3b show three-dimensional, exploded, top and bottom views of a smart battery according to the present invention, an

Fig. 4a and 4b show three-dimensional, top and bottom views of an electronic module of a smart battery according to the present invention.

Detailed Description

In the following description, all smart battery integration components that have been known to those skilled in the art in this field will be described only in a simplified manner.

Fig. 1 shows a simplified diagram of the components of a smart battery 1. The battery may take the form of a button cell or battery as explained below for placement in a battery case of an electronic instrument such as a watch. The smart battery in the form of a button cell is used to power the electronics of the electronic instrument.

The smart battery 1 comprises at least one electronic supply voltage control circuit 8. The circuit is connected by one of its connection pads 18 to the internal positive terminal 5 of the battery and for operation also to the internal negative terminal 4 of the battery, the internal positive terminal 5 being defined as the cathode 5 and the internal negative terminal 4 being defined as the anode. The internal negative battery terminal 4 may be directly connected to the external negative terminal 2, and the output of the circuit 8 may be directly connected to the external positive terminal 3. The electrical power supply for the electronic instrument is provided by two external terminals 2 and 3 of the battery structure.

The battery cathode 5 and anode 4 are formed of two chemicals connected to each other by the insertion of a spacer. The two chemicals chemically react in the electrolyte to produce electrical energy that is transferred through the cathode 5 and the anode 4. These chemicals may be formed from lithium (Li) defining the anode 4 and manganese oxide (MnO2) defining the cathode 5.

The circuit 8 may comprise, between the cathode 5 and the external positive terminal 3, a DC-DC converter, a processing or control unit connected to the converter, and an oscillator for controlling the DC-DC converter and the processing unit. In order to save battery power, the DC-DC converter may advantageously be a buck converter, i.e. a voltage step-down converter. The converter may continue to operate until the voltage provided by the battery reaches an end of life threshold (EOL) of the battery. In that case a direct connection between the external positive terminal 3 and the cathode 5 controlled by the processor unit is made.

The DC-DC converter of the circuit 8 may be configured to behave like a voltage step-up or voltage step-down converter according to a program stored in the processing unit memory. The DC-DC converter may also be configured in consideration of a battery charging or discharging mode. The DC-DC converter may preferably be configured as a voltage booster, for example in the case of battery charging.

Since the circuit 8 must be placed in a small-sized battery 1 such as a button cell, there must be a reduced number of electronic components. The dimensions of the cell structure may be approximately 20mm in diameter and 3.2mm thick. It may be advantageous to integrate all electronic devices in a single integrated circuit. In that case it is necessary to use an oscillator with an integrated MEMS resonator or a fully integrated RC oscillator.

The structure of the smart battery 1 will now be described with reference to fig. 2a, 2b, 3a, 3b, 4a and 4 b. The battery 1 mainly comprises a first chemical 4 and a second chemical 5, which are interconnected by means of a spacer 6 and an electronic module 7, 8, 9 comprising an electronic supply voltage control circuit 8. The circuit is electrically connected to the first and second chemicals.

The first chemical defines an anode 4 and the second chemical defines a cathode 5. The first and second chemicals chemically react in a conventional electrolyte. This makes it possible to generate electrical energy that is supplied between the cathode 5, which is an internal positive battery terminal, and the anode 4, which is an internal negative battery terminal. Advantageously, the first chemical 4 is lithium (Li) and the second chemical 5 is manganese oxide (MnO 2).

The smart battery 1 further comprises a housing 2, 3 containing all battery components. The housing is formed by a cup 3 and a lid 2, both of which are made of an electrically conductive material, assuming that the lid is the external negative terminal of the battery and the cup is the external positive terminal. The lid 2 may have a generally cylindrical shape, which may be a flat upper portion, and a cylindrical side wall terminating in a peripheral mounting rim 13. The cup 3 comprises a base and a rim portion 14 which allows it to be fixed to the lid in an insulating manner, in particular by a crimping operation.

Once the internal battery portion is assembled from the base of the cup 3, the lid 2 is mounted on the cup 3. The side wall of the lid 2 with the peripheral edge 13 is inserted into the opening of the rim portion 14 of the cup 3. The inner battery part is kept pressed between the lower surface of the upper part of the lid 2 and the bottom of the cup 3. Subsequently, the edge portion 14 is folded towards the peripheral edge 13 of the outer surface of the lid wall by a crimping operation, for example with the insertion of a sealing gasket shown in black in fig. 2 a. The sealing gasket ensures that the lid 2 is electrically insulated from the cup 3 and seals the finished cell.

The first chemical 4, which defines the anode of the cell, is in direct contact with the inner surface of the upper part of the cover 2, the cover 2 also forming the external negative cell terminal 2. However, the second chemical 5, which defines the cathode of the battery, is connected to a circuit 8, which is explained below. The connection of the second chemical to the input terminal of the circuit 8 forms the internal positive terminal of the smart battery 1.

An electronic module carrying a circuit 8 is mounted on one face of the second chemical 5. The electronic module comprises a printed circuit board 7 mounted on one of its faces and connected at least to a circuit 8, the circuit 8 being encapsulated in an encapsulating material 9. The printed circuit board 7 preferably has only one first side with one layer of conductive paths 26, 27, 28 and an insulating layer on the layer of conductive paths. The second insulating surface of the printed circuit board 7 is fixed to the second chemical 5 or in contact with the second chemical 5. The circuit 8 is preferably placed in a central position on the printed circuit board 7.

The circuit 8 is connected to at least one first electrical connection pad 23 by at least one first electrically conductive path 26 on a first side of the printed circuit board 7. The first conductive path 26 is connected to at least one output terminal of the circuit 8. Preferably, at least three first electrical connection pads 23 may be provided, which are evenly spaced and describe a portion of a circle. The three first connection pads 23 are preferably identical and placed in the middle between the centre and the periphery of the printed circuit board 7. Thus, starting from the circuit 8, three first conductive paths 26 each for connecting a corresponding first connection pad 23 may also be provided.

Each first connection pad 23 is intended to make contact with an electrical connection area 3a of a cup 3, which cup 3 defines an external positive battery terminal. The connection region 3a may advantageously be ring-shaped with a diameter equal to the diameter described for the first connection pad 23. The connection region 3a extends from the base of the cup 3 towards the interior of the cell. This electrical connection area 3a is supported on each first connection pad 23 so as to establish an electrical connection once all the components are mounted between the lid 2 and the cup 3. The first connection pad 23 may also be crimped to the electrical connection region 3 a.

The circuit 8 is also connected to at least one second electrical connection pad 17 by at least one second electrically conductive path 27. This second electrical connection pad 17 must be connected to the internal negative terminal, this second electrical connection pad 17 also being the external negative terminal 2 as explained below. This external negative terminal of the lid is in direct contact with the first chemical 4 defining the anode. The second conductive path 27 is connected to at least one ground terminal of the circuit 8. Preferably, three second electrical connection pads 17 and three second electrically conductive vias 27 are provided, each of which is connected to a corresponding second connection pad 17.

The three second connection pads 17 are preferably each placed on a corresponding first tab 7' of the printed circuit board 7. Three first tabs 7' extend outwardly from the outer periphery of the printed circuit board 7, which may be circular. The first flap 7' may preferably have a curve for the connection of the second connection pad 17 to the inner surface of the wall of the cover 2. Three identically shaped first tabs are preferably arranged on the outer periphery, evenly spaced from each other, i.e. the centre of each first tab is spaced 120 ° from the centre of another adjacent first tab.

It should be noted that the entire printed circuit board 7 may be rigid or flexible. It is conceivable that the fixed base of the printed circuit board 7 carrying the circuitry 8 is rigid, while the at least three first tabs 7' may be flexible. The printed circuit board 7 is preferably a standard Polyimide (PI) dielectric substance on which copper conductive vias are etched. An insulating or capping layer, also made of polyimide, is deposited on the copper layer to isolate all conductive paths as shown by the dashed lines in fig. 4 a.

The circuit 8 is also connected to at least one third electrical connection pad 18 by at least one third electrically conductive path 28. This third electrical connection pad 18 has to be connected to an internal positive terminal which is directly connected to the second chemical 5 corresponding to the cathode as explained below. Third conductive path 28 is connected to at least one input terminal of circuit 8. Preferably, three third electrical connection pads 18 and three electrically conductive vias 28 are provided, each of which is connected to a corresponding third connection pad 18.

The three third connection pads 18 are preferably each placed on a corresponding second wing 7 "of the printed circuit board 7. Three second flaps 7 "extend outwardly from the circular outer periphery of the printed circuit board 7 before folding. Each second flap is folded 180 ° with respect to the fixed base of the printed circuit board and fixed to the second face of the printed circuit board 7. After the second wing has been folded and fastened, each third connection pad 18 is arranged to be electrically connected to the second chemical 5.

Preferably, three second fins 7 "of the same shape are arranged at the periphery at even intervals from each other, i.e. the center of each second fin is 120 ° apart from the center of another adjacent fin. Each second tab 7 "is also evenly spaced between two adjacent first tabs 7'. The outer periphery of the printed circuit board 7 thus comprises three first fins 7' and three second fins 7 "alternately and evenly spaced for connection to the two chemicals 4 and 5 using the second and third connection pads 17 and 18.

Like the three first flaps 7', the three second flaps 7 "can be designed to be flexible so that they are easier to bend and fasten. Instead, the fixed base of the printed circuit board 7 may be rigid.

The printed circuit board 7 is mounted on an insulating support 10 made of plastic material. The printed circuit board 7 may be fixed to the insulating support 10, for example by gluing, the printed circuit board 7 also being fixed or glued to the second chemical 5 at the periphery. The insulating support may be generally ring-shaped with a central opening to secure the second side of the printed circuit board 7 to the second chemical 5. For positioning the printed circuit board 7 before fixing the printed circuit board 7 to the holder, said insulating holder 10 has a cylindrical lug in the printed circuit board 7 adapted to be inserted into the hole 12. The diameter of the hole is equal to or slightly larger than the diameter of the lug 11.

The insulating support 10 also has, on its periphery, at least one support heel 10a, and preferably three support heels 10a for supporting and fixing the three first fins 7'. The outer fastening surface of each bracket heel 10a corresponds to each first tab to be fastened. Preferably, during assembly of the battery assembly, bending the outer surface of each heel 10a makes it easier to fasten each tab 7' and allows to slightly bend each second connection pad 17 and to contact each second connection pad 17 by friction on the inner surface of the wall of the cover 2. By mounting the three heels 10a on the outer periphery of the insulating support 10, the connection by friction of the second connection pad becomes easier.

It is also possible to provide a base fixed to the cup 3 and a sealing ring 15 surrounding the annular connection zone 3 a. The first side of the printed circuit board 7 with the insulating layer compresses the sealing ring in order to connect the connection areas 3a on the first connection pads 23.

The different steps of the method of manufacturing the smart battery 1 will now be explained. In an initial step, the circuit 8 is first mounted on a first side of a printed circuit board 7, the printed circuit board 7 comprising a layer of non-intersecting conductive paths 26, 27, 28 and an insulating layer on the conductive path layer. The circuit 8 is electrically connected to the plurality of conductive paths in a conventional manner prior to being encapsulated in the encapsulation material 9. Each second flap 7 "of the printed circuit board is folded by 180 ° and fastened to the second insulating face of the printed circuit board. The third connection pad 18 is thus on the side of the second face for connection to the second chemical 5 defining the cathode.

Once the electronic module is completed, the first tab 7' of the printed circuit board is bent and the second insulating face of the first tab is glued to the complementary shaped support heel 10a of the insulating support 10 and the support lug 11 is inserted into the positioning hole 12 of the printed circuit board 7. The first side of the printed circuit board with the insulated conductive paths is placed on a sealing ring 15 fixed on the inside of the base of the cup 3. The sealing ring may be made of an adhesive material so as to allow the first side of the printed circuit board to adhere to the sealing ring.

A second chemical 5, defining the cathode of the battery, is fixed to the insulating support 10 in contact with the second face of the printed circuit board 7 and with the third connection pad 18. The spacer 6 and the first chemical 4 are assembled on the second chemical 5 before or after the second chemical is fixed to the bracket 10.

The lid 2 is then mounted on the cup 3 by pressing on the bracket heel 10a, on which bracket heel 10a is mounted the first tab 7' supporting externally the second connection pad 17. Electrical contact can then be established, in particular by friction, between the inner surface of the wall of the cover 2 and the contact pad 17. The peripheral mounting rim 13 of the lid is inserted into the opening of the cup by pressing the inner spacer member of the battery, guided by the bracket heel 10 a.

Once the lid 2 is positioned on the cup 3, the rim portion 14 is folded down towards the peripheral edge 13 of the outer surface of the lid wall. A crimping operation is carried out to compress the sealing gasket between the edge portion 14 and the peripheral edge 13 so as to electrically isolate the lid 2 from the cup 3 and ensure sealing of the finished cell.

From the description just given, several variants of a smart battery with an electronic module comprising a supply voltage control circuit will be apparent to the person skilled in the art without departing from the scope of the invention as defined by the claims. The connection of the two chemical substances of the electronic supply voltage control circuit on the printed circuit board can be accomplished in different ways, for example by means of electrically conductive connecting lugs. The circuit may be placed on the periphery of the printed circuit board and the connection of the two chemicals may be accomplished by means of conductive vias through the printed circuit board. The first connection pad may make contact with an electrical connection area of the cover, which defines an external negative terminal of the battery according to a circuit diagram of the circuit connection arrangement. The second connection pad may be in direct contact with the first chemical using a first tab folded 180 ° and a second side of the printed circuit board secured to the first chemical. The connection area of the lid has an annular shape with a diameter equal to the diameter described for the first connection pad. The second side of the printed circuit board may be fixed to or in contact with the first chemical, while the second chemical may be directly connected to the external positive terminal of the cup.

Claims (30)

1. Smart battery (1) comprising an electronic module with a circuit (8) for controlling the supply voltage, said electronic module being arranged in a housing structure comprising a cup (3) made of an electrically conductive material and a lid (2) made of an electrically conductive material, said lid (2) being fixed to the cup (3) by means of a sealing gasket, the cup defining the external positive terminal of the battery and the lid defining the external negative terminal of the battery, the battery further comprising, within the housing structure, a first chemical (4) as anode connected to a second chemical (5) as cathode,

the smart battery is characterized in that the electronic module comprises a printed circuit board (7) having a first face with a layer comprising conductive paths (26, 27, 28), a circuit (8) mounted on the first face and connected to the conductive paths (26, 27, 28), and a second insulating face fixed to or in contact with one of the chemical substances,

connecting the circuit (8) from the output terminals to at least one first electrical connection pad (23) on a first face of the printed circuit board (7) through at least one first electrically conductive path (26), the first electrical connection pad being directly connected to the cup (3) or the lid (2),

the circuit (8) is also connected, by at least one second electrically conductive path (27), to at least one second electrical connection pad (17) which is electrically connected to the first chemical substance defining the internal negative terminal and which is connected to the lid if the first connection pad is directly connected to the cup, and

the circuit (8) is also connected by at least one third electrically conductive path (28) to at least one third electrical connection pad (18) which is electrically connected to a second chemical defining an internal positive terminal, the third electrical connection pad being connected to the cup if the first connection pad is directly connected to the lid.

2. Smart battery (1) according to claim 1, characterized in that an insulating layer is deposited on the layer of conductive paths (26, 27, 28), leaving a path to the first electrical connection pad (23) for direct electrical connection to the cup (3) or lid (2).

3. Smart battery (1) according to claim 2, characterised in that the printed circuit board (7) is flexible.

4. Smart battery (1) according to claim 2, characterised in that the battery comprises three first electrical connection pads (23).

5. Intelligent battery (1) according to claim 4, characterized in that the three first electrical connection pads (23) are identical and placed in the middle between the centre and the periphery of the circular printed circuit board (7).

6. Intelligent battery (1) according to claim 5, characterized in that three first electrical connection pads (23) are evenly spaced and describe a portion of a circle.

7. Intelligent battery (1) according to claim 6, characterized in that the three first electrical connection pads (23) are in contact with an electrical connection area (3a) of the cup (3) or lid (2), which electrical connection area (3a) is ring-shaped and has a diameter equal to the diameter described by the three first electrical connection pads (23).

8. Smart battery (1) according to claim 1, characterised in that the circuit (8) is placed in the middle part of the printed circuit board (7).

9. Smart battery (1) according to claim 1, characterised in that the second electrical connection pad (17) is placed on the first tab (7') of the printed circuit board (7).

10. Smart battery (1) according to claim 9, characterised in that the first tab (7') extends outwards from the outer periphery of the printed circuit board (7).

11. Smart battery (1) according to claim 10, characterised in that the battery comprises three second electrical connection pads (17), each of which is placed on a corresponding first tab (7') of the printed circuit board (7).

12. Smart battery (1) according to claim 11, characterized in that three identically shaped first tabs (7') are placed at regular intervals between each other on the periphery of the circular printed circuit board (7), the centre of each first tab being separated by 120 ° from the centre of another adjacent first tab.

13. Smart battery (1) according to claim 1, characterised in that the third electrical connection pad (18) is placed on the second tab (7 ") of the printed circuit board (7).

14. Smart battery (1) according to claim 13, characterised in that the second tab (7 ") extends outwards from the outer periphery of the printed circuit board (7).

15. Smart battery (1) according to claim 14, characterised in that the battery comprises three third electrical connection pads (18), each of which is placed on a corresponding second tab (7 ") of the printed circuit board (7).

16. Smart battery (1) according to claim 15, characterized in that three identically shaped second tabs (7 ") are placed at regular intervals between each other on the periphery of the circular printed circuit board (7), the centre of each second tab being separated by 120 ° from the centre of another adjacent second tab.

17. Smart battery (1) according to claim 16, characterised in that each second tab (7 ") is fixed to the second face of the printed circuit board (7) folded 180 ° with respect to the fastening base of the printed circuit board, so as to electrically contact the second chemical substance.

18. The smart battery (1) according to claim 1, characterized in that the battery comprises three second electrical connection pads (17) and three third electrical connection pads (18), each second electrical connection pad being placed on a corresponding first tab (7 ') of the printed circuit board (7), each third electrical connection pad being placed on a corresponding second tab (7 ") of the printed circuit board, and the outer circumference of the printed circuit board (7) thus comprising alternately and evenly spaced three first tabs (7') and three second tabs (7") for the connection of two chemical substances (4, 5) with the second and third electrical connection pads (17, 18).

19. Smart battery (1) according to claim 18, characterized in that the three first tabs (7') and the three second tabs (7 ") of the printed circuit board are made of flexible material.

20. Smart battery (1) according to claim 18, characterised in that the printed circuit board (7) is mounted on an insulating support (10) of annular shape, which insulating support is fixed to one of the chemicals, and the second side of the printed circuit board (7) is fixed to one of the chemicals through an opening of the insulating support (10).

21. Smart battery (1) according to claim 20, characterised in that the insulating bracket (10) has at its periphery three bracket heels (10a) for supporting and fastening three first tabs (7').

22. Smart battery (1) according to claim 21, characterised in that the external fastening surface of each bracket heel (10a) corresponds to the external fastening surface of each first tab to be fastened by bending one external surface of each heel (10 a).

23. Smart battery (1) according to claim 22, characterised in that the second electrical connection pad (17) is directly connected to the lid (2), three third electrical connection pads (18) are electrically connected to the second chemical substance (5), wherein the three third electrical connection pads are folded over the three second tabs (7 ") and fixed to the second face of the printed circuit board (7), and the three first electrical connection pads (23) are directly connected to the cup (3).

24. Smart battery (1) according to claim 1, characterized in that the circuit (8) is encapsulated in an encapsulating material, wherein the circuit (8) is mounted and connected to conductive paths (26, 27, 28) on the first side of the printed circuit board, and that the circuit (8) comprises a DC-DC converter, a processing unit connected to the converter, and an oscillator for controlling the DC-DC converter and the processing unit, the DC-DC converter being configured to step down the battery supply voltage until the voltage provided by the battery reaches an end-of-life threshold.

25. A manufacturing method for manufacturing a smart battery (1) according to claim 1, the method comprising the steps of:

-mounting and electrically connecting a circuit (8) on a first side of a printed circuit board (7) comprising a layer with electrically conductive paths (26, 27, 28), at least one first electrically conductive path (26) connecting an output terminal of the circuit to at least one first electrical connection pad (23), at least one second electrically conductive path (27) connecting a ground terminal of the circuit to at least one second electrical connection pad (17), and at least one third electrically conductive path (28) connecting an input terminal of the circuit to at least one third electrical connection pad (18),

-fixing or placing in contact a second insulating face of the printed circuit board (7) on one of the first and second chemical substances (4, 5), the first and second chemical substances being mutually fastened,

-electrically connecting the second electrical connection pad (17) to the first chemical (4),

-electrically connecting the third electrical connection pad (18) to the second chemical (5),

-placing the components of the electronic module and the first and second chemicals in a cup (3),

-mounting a lid (2) comprising a peripheral mounting rim (13) on the cup (3) by inserting said peripheral mounting rim into an opening of the cup, the first electrical connection pad (23) being directly connected to the cup (3) or to the lid (2), and

-folding down the rim portion (14) of the cup towards the peripheral edge (13) of the lid by inserting a sealing gasket, so as to isolate the lid (2) from the cup (3).

26. Manufacturing method according to claim 25, comprising, after mounting and electrically connecting the circuit (8) on the first face of the printed circuit board (7), the steps of:

-mounting a printed circuit board (7) on an annularly shaped insulating support (10),

-fixing the insulating support to one of the chemicals, and

-fixing the second side of the printed circuit board (7) to one of the chemicals through the opening of the insulating support (10).

27. A manufacturing method according to claim 26, wherein the second electrical connection pads (17) are placed on a first tab (7') extending outwardly at the periphery of the printed circuit board (7) and the third electrical connection pads (18) are placed on a second tab (7 ") extending outwardly at the periphery of the printed circuit board (7), characterized in that the second tab is folded by 180 ° and fixed to the second side of the printed circuit board before or after the mounting and electrical connection of the circuit (8) to the first side of the printed circuit board (7), and the third electrical connection pads (18) are brought into contact with the second chemical substance (5) when the second side of the printed circuit board is fixed to the second chemical substance.

28. Method of manufacturing according to claim 27, wherein the insulating support (10) comprises at least one support heel (10a) at its periphery, characterized in that the second face of the first tab (7') is folded and glued onto the support heel (10a) of complementary shape of the insulating support.

29. Method of manufacturing according to claim 28, wherein the three first tabs (7 ') have three second connection pads (17) and the three second tabs (7 ") have three third connection pads (18), the three first tabs and the three second tabs being evenly spaced and alternately arranged at the periphery of the printed circuit board, and wherein the insulating support (10) comprises three support heels (10a) evenly spaced at the periphery, characterized in that the three second tabs (7") are folded by 180 ° and fixed to the second side of the printed circuit board before or after mounting and electrically connecting the circuit (8) on the first side of the printed circuit board (7), and the second sides of the three first tabs (7') are folded and glued to the corresponding support heels (10 a).

30. Manufacturing method according to claim 29, characterised in that before assembling the lid (2), the first face of the printed circuit board (7) is placed on a sealing ring (15) internally fixed to the base of the cup (3) and during the assembly of the lid the inner wall of the lid contacts a second connection pad (17) placed on a first tab (7') fixed to the bracket heel (10a) and the annular area (3a) of the base of the cup contacts one or more first electrical connection pads (23).