Braking system comprising two batteries

Abstract

The invention relates to a braking system comprising: a braking device (2); first (3) and second (4) batteries for supplying power to the braking device (5); and switching means (K1, K2) for switching between the batteries (3, 4) and the braking device (5), wherein the switching means (K1, K2) are controlled by first and second parameters respectively of the first (3) and second (4) batteries, such that, if the values of the first and second parameters are greater than or equal to a predetermined threshold, the switching means (K1, K2) are configured in a connection state in which the two batteries (3, 4) are connected in series to the braking device, and, if the value of the first or second parameter respectively is below the threshold, the switching means (K1, K2) are configured in a connection state in which only the second battery (4) or only the first battery (3) respectively is connected to the braking device (5).

Description

Braking system including two batteries

[0001] The invention relates to braking devices for vehicles requiring an electrical power supply, in particular electromechanical or electromagnetic braking devices. It also relates to electric parking or emergency braking devices.

[0002] An electromechanical vehicle braking system comprises an electromechanical braking device and a power supply comprising an electric battery to power the braking device. In an electromechanical braking device, braking power depends on the electrical power transmitted by the battery. It is therefore essential to provide sufficient power and ensure that electrical energy is available under all circumstances.

[0003] An electromechanical braking system is known in the prior art, comprising a second electric battery connected to the device in parallel with the first battery, as a safety measure, in order to power the braking device in the event of failure of the first battery. Logically, this second battery most often remains unused.

[0004] A disadvantage of this system is that the power of the braking device is limited by the voltage supplied by a single power supply battery. Therefore, to compensate for this voltage and transmit the necessary electrical power to the device, the intensity of the current supplied must be high, which requires electrical wiring with a large cross-section, making it expensive, heavy and bulky.

[0005] The invention aims in particular to reduce the cross-section of the electrical wiring supplying the braking device, at equal power, at least as long as no battery is faulty.

[0006] To this end, the invention relates to a braking system comprising:

[0007] - a braking device,

[0008] - first and second electrical power supply batteries for the braking device,

[0009] - means of switching between the batteries and the braking device,

[0010] in which the switching means are controlled by first and second parameters respectively of the first and second batteries, so that, if the first and second parameters have respective values ​​greater than or equal to a predetermined threshold, the switching means are configured in a state of connection of the two batteries in series to the braking device, and, if the first parameter, respectively the second parameter, has a value lower than the threshold, the switching means are configured in a state of connection of the second battery alone, respectively of the first battery alone, to the braking device.

[0011] As a person skilled in the art will understand from reading the detailed description of the invention below, the state of connection of the two batteries in series to the braking device corresponds to a circuit portion in which the two batteries and the braking device are all three connected end to end, so that the current flows through each of these components successively, this series connection making it possible to supply the braking device with a total voltage equal to the sum of the individual voltages of the two batteries. Conversely, the state of connection of a single battery to the device corresponds to the absence of such a circuit portion comprising the three components end to end, and therefore only makes it possible to supply the braking device with a voltage equal to the voltage of the battery alone.

[0012] Thus, when both batteries are operating normally, that is, when their respective parameters, typically voltage or internal resistance, have values ​​greater than or equal to the predetermined threshold, the series connection of the two batteries allows the voltage generated by both batteries connected in series to be transmitted to the braking device, rather than transmitting only the voltage generated by a single battery. This system therefore allows equal power to be transmitted to the device with reduced intensity, so that electrical wiring with a smaller cross-section can be used than before. Alternatively, by keeping the same wiring, this system allows the power transmitted to the braking device to be increased, without adding a battery.When one of the batteries is no longer functioning optimally, or even malfunctions, i.e. when the value of its parameter is below the threshold, the corresponding battery is isolated from the device but also from the other battery, so as to avoid a short circuit or the discharge of one battery into the other. The braking device remains powered by the normally functioning battery, so that braking safety is ensured.

[0013] The presence of the two batteries is therefore optimized since they are both used when they are both operating normally, and one of the batteries can continue to power the device when the other is unavailable.

[0014] Other optional features follow, taken alone or in combination.

[0015] Advantageously, each parameter is a voltage across the respective battery terminals.

[0016] Thus, it is the voltage value across each battery that controls the switching means. When the voltage across one battery is too low, it is isolated from the rest of the circuit, so that only the other battery powers the braking device. When both batteries are operating normally, their two voltages are added together via the series connection to power the braking device.

[0017] Preferably, the switching means comprise at least one switch-forming component which changes state depending on a voltage value across the terminals of the component.

[0018] Thus, there is no need to add a command processing unit to control the component. The mode change is therefore autonomous, fast, and does not require additional elements to the system.

[0019] Advantageously, the system comprises a control unit obtaining the value of at least one of the parameters of the batteries, preferably the value of the parameter of each battery, and controlling the switching means according to each value.

[0020] So, in this case, it is this unit which controls the switching means or some of the switching means.

[0021] It is also possible to provide both some switching means changing state autonomously and a control unit to control the other switching means.

[0022] Preferably, the switching means comprise at least one switch-forming component chosen from: a diode, a switching transistor, a dry or movable contact switch, and a relay.

[0023] These components are therefore inexpensive and relatively uncomplicated. They are also controllable by the voltages at their respective terminals and can therefore be driven autonomously, without external control.

[0024] Advantageously, the switching means comprise a switch and a three-position switch,

[0025] - the switch having:

[0026] - a closing position of a bypass circuit of the second battery, so as to connect the first battery alone to the device when the three-position switch is in the open position;

[0027] - an open position,

[0028] - the three-position switch having:

[0029] - a closing position of a series connection circuit, so as to connect the two batteries in series to the device when the switch is in the open position;

[0030] - a closing position of a bypass circuit of the first battery, so as to connect the second battery alone to the device when the switch is in the open position;

[0031] - an open position.

[0032] Thus, by changing position, depending on the respective parameter values ​​of the batteries, these components allow the batteries to be connected in series to the device or, conversely, to connect only one of the batteries to the device and isolate the other battery from the rest of the system. Three-position switches and switches are components that can be tested individually in an easy way.

[0033] Preferably, the switching means comprise a switch and first and second diodes,

[0034] - the switch having:

[0035] - a closing position of a series connection circuit, so as to connect the two batteries in series to the device when the first and second diodes are blocking;

[0036] - an open position;

[0037] - the first diode being conductive when a voltage across the terminals of the second battery is lower than the threshold, to form a bypass circuit for the second battery, so as to connect the first battery alone to the device;

[0038] - the second diode being conductive when a voltage across the terminals of the first battery is lower than the threshold, to form a bypass circuit of the first battery, so as to connect the second battery alone to the device.

[0039] Thus, when both batteries are operating normally, the switch is driven to be in the closed position and the battery parameters generate potential differences in the system such that the diodes, positioned for this purpose, allow the flow of current in series only. However, as soon as one battery has a parameter value below the threshold, the switch is driven to be in the open position, and the changes in potentials in the circuit are such that the diodes isolate the corresponding battery from the rest of the system to power the device only from the other battery. Diodes are cheaper components than switches.

[0040] Advantageously, the batteries are of the lead or metal-ion type, for example lithium-ion or sodium-ion.

[0041] The invention also relates to a vehicle comprising a braking system as described above.

[0042] The invention also relates to a method for controlling switching means intended to organize the electrical connection between a braking device and first and second electrical power supply batteries of the braking device, the method comprising the following steps:

[0043] - obtaining first and second parameters respectively of the first and second batteries,

[0044] - if the first and second parameters have respective values ​​greater than or equal to a predetermined threshold, the switching means are configured in a state of connection of the two batteries in series to the braking device, and, if the first parameter, respectively the second parameter, has a value less than the threshold, the switching means are configured in a state of connection of the second battery alone, respectively of the first battery alone, to the braking device.

[0045] The invention also relates to a data processing unit comprising means for implementing the steps of the method described above.

[0046] The invention also relates to a computer program comprising instructions which, when the program is executed by a computer, cause the latter to implement the steps of the method described above.

[0047] The invention also relates to a computer-readable recording medium comprising instructions which, when executed by a computer, cause the latter to implement the steps of the method described above. Brief description of the figures

[0048] The invention will be better understood on reading the following description, given solely by way of example and with reference to the appended drawings in which:

[0049] is a schematic view of a vehicle comprising a braking system according to the invention;

[0050] is an electrical diagram of a braking system according to a first embodiment of the invention, configured in a first state;

[0051] is a circuit diagram of the embodiment of the, configured in a second state;

[0052] is a circuit diagram of the mode of the, configured in a third state;

[0053] is a diagram of a method for controlling switching means of the invention according to a first embodiment of the invention;

[0054] is an electrical diagram of a braking system according to a second embodiment of the invention, configured in a first state;

[0055] is a circuit diagram of the embodiment of the, configured in a second state;

[0056] is a circuit diagram of the embodiment of the, configured in a third state; and

[0057] is a diagram of a method for controlling switching means of the invention according to a second embodiment of the invention. Detailed description

[0058] A vehicle 1 is shown, more particularly a motor vehicle, comprising wheels and a braking system 2 according to a first embodiment.

[0059] This first embodiment is illustrated in more detail in Figures 2 to 4. This braking system 2 comprises a first lead battery 3 and a second lead battery 4. Batteries 3 and 4 are identical. They are “12 volt” batteries. Each battery comprises respective positive and negative terminals. The invention is not limited to a particular type of electric battery. It could be another type of electric battery, in particular of the “metal-ion” type, for example “lithium-ion” or “sodium-ion”. The batteries could also deliver a voltage other than 12 V.

[0060] The system 2 also includes an electromechanical braking device 5 for a vehicle, called an “EMB” (for “Electro-Mechanical Brake”) in English. It includes a terminal A and a terminal B. This type of braking device is powered by electricity to generate a tightening torque intended to brake and stop the wheels of the vehicle. More generally, the invention is designed to operate with any braking device requiring electrical energy to perform braking, such as a parking or emergency brake (called an “EPB” for “Electric Parking Brake” in English), or an electromagnetic braking device.

[0061] Batteries 3 and 4 are connected to each other and to the braking device 5 by an electrical circuit provided with switching means. These switching means are two switches K1 and K2, of the “relay” type. Alternatively, it comprises switching transistors or switches with dry or movable contact.

[0062] Switch K1 has three terminals: a common terminal C, a first closed position terminal D, and a second closed position terminal E.

[0063] Switch K2 has a common terminal F and a closed terminal G. Since switch K2 has only two possible positions, it could be called a "switch" rather than a "two-position switch".

[0064] Battery 3 is connected, by its positive terminal, to terminal D of the first closed position of switch K1. Battery 3 is connected, by its negative terminal, to terminal E of the second closed position of switch K1. Battery 3 is also connected, by its negative terminal, to the electrical ground of the system.

[0065] Battery 4 is connected, by its negative terminal, to the common terminal C of switch K1. Battery 4 is connected, by its positive terminal, to the common terminal F of switch K2.

[0066] The braking device 5 is connected, by its terminal B, to the common terminal F of the switch K2. The braking device 5 is connected, by its terminal A, to the second closed position terminal E of the switch K2.

[0067] The first closed position terminal D of switch K1 is connected to the closed position terminal G of switch K2.

[0068] It results from this assembly that:

[0069] - relay K2 has two positions:

[0070] - an open position;

[0071] - a closing position of a bypass circuit of battery 4, so as to connect battery 3 alone to device 5 when relay K1 is in the open position; and

[0072] - relay K1 has three positions:

[0073] - an open position;

[0074] - a closing position of a series connection circuit, so as to connect in series the two batteries 3 and 4 to the device 5 when the relay K1 is in the open position;

[0075] - a closing position of a bypass circuit of battery 3, so as to connect battery 4 alone to device 5 when relay K2 is in the open position.

[0076] Finally, the braking system 2 comprises a control unit 6, illustrated schematically in the, configured to collect the voltages generated by each of the batteries 3 and 4, and to control the relays K1 and K2 as a function of each of these voltages. It is connected by means not illustrated to the batteries 3 and 4 and to the switching means. It comprises means for implementing the steps of a method for controlling the switching means K1 and K2 according to a first embodiment 100 described below. In particular, it comprises a computer-readable recording medium 7 comprising instructions which, when executed by a computer, cause the latter to implement the steps of the method 100. This medium in fact allows the execution of a computer program 8 comprising instructions which, when the program is executed by a computer, cause the latter to implement the steps of the method 100.By "computer" and "computer program" we could also speak of "calculator" and respectively "calculator program".

[0077] Relays K1 and K2 are therefore controlled by unit 6 to move from one position to another depending on the voltage at their respective terminals, in method 100 described below with reference to.

[0078] In step 110 of this method 100, the control unit 6 obtains the respective voltages of the batteries 3 and 4.

[0079] In step 120, if the two voltages are equal to or greater than a predetermined threshold, for example 9 V, the switching means K1 and K2 are configured in a state of connection of the two batteries 3 and 4 in series to the braking device 5, and, if the voltage of the battery 3, respectively of the battery 4, has a value lower than the threshold of 9 V, the switching means K1 and K2 are configured in a state of connection of the battery 4 alone, respectively of the battery 3 alone, to the braking device 5. The value of the threshold is advantageously determined during the design of the braking system and corresponds for example to the value below which a faulty battery does not participate positively in the operation of the braking devices and / or to the value below which an additional discharge would be detrimental to the faulty battery.

[0080] Three states of system 2 are thus planned depending on the voltages generated by the two batteries, depending on a battery voltage threshold set at 9 V. This threshold could be set at another value.

[0081] Thus, in a first state, illustrated by the arrows running through the circuit in the figure, the two batteries 3 and 4 each generate a voltage greater than or equal to the predetermined threshold of 9 V. In this state, called "normal operating", given that this threshold is respected, the relay K1 is controlled by the unit 6 to be in the first closed position, thus connecting its common terminal C to its terminal D, and the relay K2 is controlled by the unit 6 to be in the open position. In this state, the two batteries 3 and 4 are connected in series to the braking device 5. The voltages generated by the two batteries therefore add up to supply the braking device 5.

[0082] The second state, illustrated in, is adopted by the unit 6 when the battery 3 generates a voltage lower than the threshold of 9 V. This is a so-called "degraded" mode. In this state, the relay K1 goes into the second closed position, connecting its common terminal C to its terminal E, and the relay K2 remains in the open position. These connections thus form a bypass circuit for the battery 3, so as to connect the battery 4 alone to the device 5. Thanks to this change, the battery 3, isolated, does not discharge into the battery 4, and vice versa. The braking system 2 continues to operate in degraded mode thanks to the battery 4, that is to say that the braking device 5 continues to have braking power thanks to the energy supplied by the battery 4. It is intended that an alert be provided to the driver of the vehicle by means not illustrated to warn him of this change of state.This system provides sufficient, although weaker, braking until battery 3 is restored to normal operating condition.

[0083] The third state, illustrated in, is adopted by the unit 6 when it is the battery 4 which generates a voltage lower than the threshold of 9 V. This is also a so-called "degraded" state. In this state, the relay K1 goes to the open position, and the relay K2 goes to the closed position, connecting its common terminal F to its terminal G. These connections thus form a bypass circuit of the battery 4, so as to connect the battery 3 alone to the device 5. Thanks to this change, the battery 4, isolated, does not discharge into the battery 3, and vice versa. The braking system 2 continues to operate in degraded mode thanks to the battery 3, that is to say that the braking device 5 continues to have braking power thanks to the energy supplied by the battery 3. It is intended that an alert is provided to the driver of the vehicle 1 by means not illustrated.However, the system provides sufficient braking until battery 4 is restored to normal operating condition.

[0084] Alternatively, the braking system 2 does not include a control unit 6. The relays K1 and K2 are controlled by the voltages at their respective terminals. They are therefore autonomous. These respective voltages being directly derived from the voltages generated by the batteries in the circuit, the relays are therefore indirectly controlled by the voltages generated by the batteries 3 and 4, being configured beforehand to switch from one state to the other when the predetermined threshold of 9 V at the terminals of the batteries is crossed in one direction or the other. The method 100 is therefore identical, but it is implemented by the relays K1 and K2 themselves rather than by the control unit 6. The three possible states of the system 2 are therefore identical.

[0085] A second embodiment will now be described with reference to figures 5 to 7, illustrating a braking system 9.

[0086] In this system 9, the batteries 3 and 4, as well as the braking device 5, are identical to those of the system 2. The unit 6 is configured to implement a method for controlling switching means according to a second implementation mode 200 described below. The negative terminal of the battery 3 is always connected to the electrical ground of the system.

[0087] The switching means, however, are different from those of system 2.

[0088] These switching means include three diodes J1, J2, and J3, and a relay K3. The relay could be another type of switch. Each diode has an anode and a cathode. Relay K3 has a common terminal H and a closed terminal I.

[0089] Battery 3 is connected, by its positive terminal, to terminal I of relay K3. Battery 3 is connected, by its negative terminal, to the anode of diode J2.

[0090] Battery 4 is connected, by its negative terminal, to the common terminal H of relay K3. Battery 4 is connected, by its positive terminal, to the anode of diode J3.

[0091] The braking device 5 is connected, by its terminal B, to the cathode of the diode J3. The braking device 5 is connected, by its terminal A, to the anode of the diode J2.

[0092] Diode J1 is connected, by its cathode, to the cathode of diode J3. Diode J1 is connected, by its anode, to the closed position terminal I of relay K3.

[0093] Diode J2 is connected by its cathode to the common terminal H of relay K3.

[0094] Relay K3 is controlled by control unit 6 according to a method 200 illustrated in.

[0095] Thus, in step 210 of this method 200, the control unit 6 obtains the respective voltages of the batteries 3 and 4.

[0096] In step 220, if the two voltages are greater than or equal to 9 V, K3 is placed in the closed position, so as to achieve a state of connection of the two batteries 3 and 4 in series to the braking device 5, and, if the voltage of the battery 3, respectively of the battery 4, has a value lower than the threshold of 9 V, K3 is placed in the open position, so as to achieve a state of connection of the battery 4 alone, respectively of the battery 3 alone, to the braking device 5, depending on the state of the diodes described below.

[0097] Diodes J1, J2 and J3 are conductive when the potential at their respective anodes is higher than the potential at their respective cathodes, and are blocking otherwise. They are therefore indirectly controlled by the voltages generated by batteries 3 and 4 in the circuit. They are therefore configured to switch from "blocking" to "conducting" or vice versa depending on the voltages generated by the batteries relative to the 9 V threshold and depending on the position of relay K3.

[0098] It results from this assembly that:

[0099] - relay K3 has:

[0100] - a closing position of a series connection circuit, so as to connect the two batteries 3 and 4 in series to the device 5 when the diodes J1 and J2 are blocking;

[0101] - an open position;

[0102] - diode J1 is conductive when a voltage across the terminals of battery 4 is lower than the predetermined threshold of 9 V, to form a bypass circuit for battery 4, so as to connect battery 3 alone to device 5;

[0103] - diode J2 is conductive when a voltage across battery 3 is lower than the predetermined threshold of 9 V, to form a bypass circuit for battery 3, so as to connect battery 4 alone to the device.

[0104] - diode J3 is conductive when a voltage at the terminals of battery 4 is higher than the predetermined threshold of 9 V.

[0105] The states illustrated in Figures 6 to 8 are symmetrical to those in Figures 2 to 4.

[0106] Thus, in the so-called "normal" state, the voltages generated by batteries 3 and 4 are greater than or equal to 9 V. Switch K3 is therefore controlled by unit 6 to be in the closed position. Due to the potentials then generated by the batteries and the positions of the diodes, diodes J1 and J2 are blocking, diode J3 is conducting. The two batteries 3 and 4 are therefore connected in series to device 5.

[0107] In the degraded state of the, the voltage of battery 3 is lower than the predetermined threshold of 9 V. Switch K3 is then controlled, by its voltage, to move to the open position. As a result, and in view of the potential differences generated, diode J2 becomes conductive, while diode J1 remains blocking. These states thus form a bypass circuit of battery 3, so as to connect battery 4 alone to device 5.

[0108] In the degraded state of the, it is the voltage of battery 4 which is lower than the predetermined threshold of 9 V. The switch K3 is then controlled, by its voltage, to move to the open position. As a result, and in view of the potential differences generated, diode J1 becomes conductive, diode J3 becomes blocking. These states thus form a bypass circuit of battery 4, so as to connect battery 3 alone to device 5.

[0109] Alternatively, unit 6 is not present. Switch K3 changes state depending on the voltage across its terminals, so it is autonomous. Since this voltage comes directly from the voltages generated by batteries 3 and 4 in the circuit, relay K3 is therefore indirectly controlled by the voltages generated by batteries 3 and 4. It is thus configured to change state depending on the voltages generated by both batteries 3 and 4 relative to the 9 V threshold.

[0110] It should be noted that the implementation of a higher voltage, for example 24 V with the two batteries in series, instead of 12 V, not only makes it possible to limit the electric current flowing between the batteries and the braking devices and the related Joule effect losses, but also provides greater torque to the motors of the braking devices. In addition, a geared motor of the braking devices of the invention may have a lower reduction ratio but sufficient to allow braking in degraded mode.

[0111] The invention is not limited to the embodiments presented and other embodiments will become clear to those skilled in the art. In particular, it is possible to vary the 9 V threshold. It is also possible, in the second embodiment, to replace relay K3 with a fourth diode.

[0112] Relays K1, K2 and K3 can be replaced by other types of switching components, including switching transistors or dry or movable contact switches.

[0113] The braking system may be provided to periodically test the proper functioning of switches K1 to K3 and / or diodes J1 to J3. The batteries are recharged by a generator, typically a vehicle alternator. List of references

[0114] 1: vehicle

[0115] 2: braking system according to a first embodiment3: electric power supply battery

[0116] 4: Power supply battery

[0117] 5: braking device

[0118] 6: control unit

[0119] 7: Recording medium

[0120] 8: computer program

[0121] 9: braking system according to a second embodiment

[0122] 100: method of controlling switching means according to a first mode of implementation

[0123] 200: method of controlling switching means according to a second mode of implementation

[0124] K1: three-position switch

[0125] K2: two-position switch or switch

[0126] K3: two-position switch or switch

[0127] J1: diode

[0128] J2: diode

[0129] J3: diode

Claims

Braking system (2; 9) comprising:a braking device (5),first (3) and second (4) batteries for electrically supplying the braking device (5),characterized in that it comprises switching means (K1, K2; J1, J2, J3, K3) between the batteries (3, 4) and the braking device (5),in which the switching means are controlled by first and second parameters respectively of the first (3) and second (4) batteries, so that, if the first and second parameters have respective values ​​greater than or equal to a predetermined threshold, the switching means (K1, K2; J1, J2, J3, K3) are configured in a state of connection of the two batteries (3, 4) in series to the braking device (5), and, if the first parameter, respectively the second parameter, has a value lower than the threshold, the switching means (K1, K2;J1, J2, J3, K3) are configured in a state of connection of the second battery (4) alone, respectively of the first battery (3) alone, to the braking device (5).; Braking system (2; 9) according to the preceding claim, wherein each parameter is a voltage across the terminals of the respective battery (3, 4). Braking system (2; 9) according to any one of the preceding claims, wherein the switching means (K1, K2; J1, J2, J3, K3) comprise at least one switch-forming component which changes state as a function of a voltage value across the component. Braking system (2; 9) according to any one of the preceding claims, comprising a control unit (6) obtaining the value of at least one of the parameters of the batteries (3, 4), preferably the value of the parameter of each battery (3, 4), and controlling the switching means (K1, K2; J1, J2, J3, K3) as a function of each value. Braking system (2; 9) according to any one of the preceding claims, in which the switching means (K1, K2; J1, J2, J3, K3) comprise at least one switch-forming component chosen from: a diode, a switching transistor, a dry or movable contact switch, and a relay. Braking system (2) according to any one of the preceding claims, wherein the switching means comprise a switch (K2) and a three-position switch (K1),- the switch (K2) having:- a closing position of a bypass circuit of the second battery (4), so as to connect the first battery (3) alone to the device (5) when the three-position switch (K3) is in the open position;- an open position,- the three-position switch (K1) having:- a closing position of a series connection circuit, so as to connect the two batteries (3, 4) in series to the device (5) when the switch is in the open position;- a closing position of a bypass circuit of the first battery (3), so as to connect the second battery (4) alone to the device (5) when the switch (K2) is in the open position;- an open position. System (9) according to any one of claims 1 to 5, wherein the switching means comprise a switch (K3) and first (J1) and second (J2) diodes, the switch (K3) having: a closed position of a series connection circuit, so as to connect in series the two batteries (3, 4) to the device (5) when the first (J1) and second (J2) diodes are blocking; an open position; the first diode (J1) being conductive when a voltage across the terminals of the second battery (4) is below the threshold, to form a bypass circuit of the second battery (4), so as to connect the first battery (3) alone to the device (5); the second diode (J2) being conductive when a voltage across the terminals of the first battery (3) is below the threshold, to form a bypass circuit of the first battery (3), so as to connect the second battery (4) alone to the device (5). System (9) according to the preceding claim, in which the first battery (3) is connected to an electrical ground, the second (4) battery being connected to a third diode (J3), this third diode (J3) being conductive when a voltage at the terminals of the second battery (4) is greater than the threshold. Braking system (2; 9) according to any one of the preceding claims, wherein the batteries are of the lead or metal-ion type, for example lithium-ion or sodium-ion. Vehicle (1) comprising a braking system (2; 9) according to any one of the preceding claims. Method (100; 200) for controlling switching means (K1, K2; J1, J2, J3, K3) intended to organize the electrical connection between a braking device (5) and first (3) and second (4) electrical power supply batteries of the braking device, the method comprising the following steps:Obtaining (110; 210) first and second parameters respectively of the first (3) and second (4) batteries,(120; 220) if the parameters have respective values ​​greater than or equal to a predetermined threshold, the switching means (K1, K2; J1, J2, J3, K3) are configured in a state of connection of the two batteries (3, 4) in series to the braking device (5), and, if the first parameter, respectively the second parameter, has a value less than the threshold, the switching means (K1, K2;J1, J2, J3, K3) are configured in a state of connection of the second battery (4) alone, respectively of the first battery (3) alone, to the braking device (5).; Data processing unit (6) comprising means for implementing the steps of the method (100; 200) according to the preceding claim. Computer program (8) comprising instructions which, when the program is executed by a computer, cause the latter to implement the steps of the method (100; 200) of claim 11. A computer-readable recording medium (7) comprising instructions which, when executed by a computer, cause the computer to carry out the steps of the method (100; 200) of claim 11.

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