MONITORING BATTERY RECHARGES IN A SYSTEM BASED ON COOLING PERFORMANCE

Abstract

A method is used to monitor the charging of a battery with a current charging parameter and a measured maximum internal temperature, suitable for equipping a system with a cooling device capable of cooling the battery at a chosen power level. This method includes a step (10-40) in which, during charging, when the measured maximum internal temperature reaches a chosen temperature and the current charging parameter is below a target value, a chosen alert message is generated and / or the power is increased when the cooling device is capable of providing this increase. Figure 3

Description

Title of the invention: MONITORING THE RECHARGES OF A BATTERY OF A SYSTEM BASED ON COOLING PERFORMANCE Technical field of the invention

[0001] The invention relates to rechargeable batteries, and more specifically to monitoring the recharging of such batteries. State of the art

[0002] In many fields, such as for example that of vehicles (possibly of the automobile type), rechargeable batteries, possibly cellular, are used to store electrical energy intended to power at least one electrical machine (possibly a motor) and / or a power supply circuit.

[0003] During a battery recharge phase, its internal temperature frequently increases significantly, particularly when the recharge current is very high. As is known to those skilled in the art, a repeatedly high internal temperature is likely to reduce the lifespan and storage capacity of a battery. This is why many rechargeable batteries are cooled by means of a cooling device fitted to the system that comprises them, so that they remain as much as possible within a non-extreme temperature range.

[0004] Currently, most cooling devices operate at a single power, and therefore it often happens that this power is not sufficient to maintain the internal temperature of the battery below a first chosen threshold. In this case, it is possible to implement, in the system comprising the battery in the recharging phase, a procedure for reducing the recharging current supplied to this battery. This procedure (called "thermal derating" in English) consists of starting to gradually reduce the intensity of the charging current as soon as the internal temperature becomes higher than the first chosen threshold and to stop supplying recharging current when the internal temperature becomes higher than a second chosen threshold strictly higher than the first chosen threshold.

[0005] It will be understood that such a procedure is likely to preserve the durability of the battery. However, it results in a cessation of recharging and therefore generally in a state of charge of the battery lower than what the user of the system concerned wanted, which may surprise and / or displease him.

[0006] Furthermore, in the event of a calibration and / or design defect, for example following a change in the physical behavior of the battery due to its aging or a problem with the physical component (or "hardware") of the means of controlling the cooling device, it is not possible to take this into account in real time, and therefore this may result in premature stops of recharges, which may surprise and / or displease the user of the system concerned, and / or harm the durability of the battery in the event of recurring exposure to temperatures between the first and second thresholds chosen above (associated with the thermal derating procedure).

[0007] The invention therefore aims in particular to improve the situation. Presentation of the invention

[0008] For this purpose, it proposes in particular a monitoring method intended to monitor recharges of a battery having a current charging parameter and a maximum measured internal temperature, and suitable for equipping a system comprising a cooling device suitable for cooling this battery according to a chosen power.

[0009] This monitoring method is characterized by the fact that it comprises a step in which, during a recharge when the maximum internal temperature measured reaches a chosen temperature and the current charging parameter is lower than a target value, a chosen alert message is generated and / or the cooling power is increased when the cooling device is capable of ensuring this increase.

[0010] Thanks to the diagnosis of the cooling performance of the battery, it is now possible to act when this performance is insufficient in order to trigger a check of the operation of the system and / or to increase the cooling capacity, which makes it possible to increase the life of the battery and / or to reduce the number of uses of a possible procedure for reducing the charging current supplied to the battery (or thermal derating).

[0011] The monitoring method according to the invention may include other characteristics which may be taken separately or in combination, and in particular:

[0012] - in its step, one can generate the chosen alert message and / or one can increase the power when the cooling device is capable of ensuring this increase, when in addition there is no signal of a safety fault in the battery;

[0013] - in a first embodiment, when the maximum internal temperature measured reaches a chosen temperature equal to a first maximum temperature in the battery triggering a stoppage of supply of a recharging current to the latter and that the current charging parameter is lower than the target value, the power can be increased when the cooling device is capable of ensuring this increase;

[0014] - in the presence of this first embodiment, in its step, when the device cooling system is not able to ensure the increase in power, a selected alert message can be generated and it can be decided to use for a subsequent recharge a cooling trigger temperature which is strictly lower than a previous trigger temperature in use;

[0015] - in a second embodiment, when the maximum internal temperature measured reaches a chosen temperature equal to a second maximum temperature in the battery triggering the start of a reduction in a recharge current supplied to the latter and that the current charge parameter is lower than the target value, the chosen alert message can be generated and the latter can be transmitted to a chosen communication server and / or this chosen alert message can be stored in at least one chosen memory;

[0016] - in its step, one can use a load parameter chosen from a state of estimated battery charge and maximum voltage measured in the battery;

[0017] - in its step, we can use a target value which is equal to a difference between a maximum allowed battery charge parameter and a chosen margin value.

[0018] The invention also proposes a computer program product comprising a set of instructions which, when executed by processing means, is capable of implementing a monitoring method of the type presented above for monitoring recharges of a battery having a current charging parameter and a maximum measured internal temperature, and capable of equipping a system comprising a cooling device capable of cooling the battery according to a chosen power.

[0019] The invention also proposes a monitoring device intended to monitor recharges of a battery having a current charging parameter and a maximum measured internal temperature, and suitable for equipping a system comprising a cooling device suitable for cooling this battery according to a chosen power.

[0020] This monitoring device is characterized by the fact that it comprises at least one processor and at least one memory arranged to carry out the operations consisting, during a recharge when the maximum internal temperature measured reaches a chosen temperature and the current charge parameter is lower than a target value, in triggering a generation of a chosen alert message and / or an increase in power when the cooling device is capable of ensuring this increase.

[0021] The invention also proposes a system comprising, on the one hand, a rechargeable battery having a current charging parameter and a maximum measured internal temperature, and a cooling device capable of cooling this battery according to a chosen power, and, on the other hand, a monitoring device of the type presented above. Brief description of the figures

[0022] Other characteristics and advantages of the invention will appear on examining the detailed description below, and the appended drawings, in which:

[0023] [Fig-1] schematically and functionally illustrates an example of the embodiment of a vehicle comprising a monitoring device according to the invention and a GMP with an electric motor powered by a rechargeable battery associated with a battery computer,

[0024] [Fig.2] schematically and functionally illustrates an exemplary embodiment of a battery calculator comprising a monitoring device according to the invention, and

[0025] [Fig.3] schematically illustrates an example of an algorithm implementing a monitoring method according to the invention. Detailed description of the invention

[0026] The invention aims in particular to propose a monitoring method, and an associated monitoring device DS, intended to enable monitoring in a system S of the recharges of a rechargeable main battery BC, as a function of the cooling performance of the latter (BC).

[0027] In the following, it is considered, by way of non-limiting example, that the system S is a motor vehicle, such as for example a car, as illustrated in [Fig.l]. But the invention is not limited to this type of system. It relates in fact to any type of system comprising at least one rechargeable battery, for example by an external power source temporarily coupled to this system. Thus, it relates to vehicles (land, sea (or river), and air), mobile machines (including those which provide a lifting function), electronic devices (possibly household appliances and / or possibly mobile), installations (possibly industrial), and buildings, for example.

[0028] Furthermore, it is considered in the following, by way of non-limiting example, that the vehicle S comprises a transmission chain with a powertrain (or GMP) of the all-electric type (and therefore comprising at least one electric motor associated with a rechargeable battery). But the GMP could be of the hybrid type (and in this case the drive of the vehicle S is provided by at least one thermal motor and one electric motor).

[0029] [Fig.l] schematically shows a system S (here a vehicle) comprising an all-electric GMP transmission chain (and therefore comprising at least one electric motor MME), a supervision computer CS, a service battery BS, a rechargeable main battery BC, a converter CV, and a monitoring device DS according to the invention.

[0030] The service battery BS is responsible for supplying electrical energy to the network of edge RB of the vehicle S, in addition to that provided by the CV converter powered by the main battery BC via a main electrical circuit, and sometimes instead of this CV converter. For example, this service battery BS can be arranged in the form of a very low voltage type battery (typically 12 V, 24 V or 48 V). It is rechargeable at least by the CV converter. In the following, as a non-limiting example, it is considered that the service battery BS is of the 12 V Lithium-ion type.

[0031] The on-board network RB is an electrical power supply network to which electrical (or electronic) equipment (or components) that consume electrical energy are coupled.

[0032] The main electrical circuit (or "high voltage" or "power") is connected, on the one hand, to the main battery BC via an interface device, and, on the other hand, to electronic equipment, such as for example the converter CV and the prime mover MME. It also allows the main battery BC to be recharged by an external power source SA temporarily coupled to the vehicle S, for example via a charging cable CR temporarily connected to a charging connector CN of the vehicle S.

[0033] The transmission chain has a GMP which is, here, purely electric, and therefore which comprises, in particular, in addition to its (electric) driving machine MME, a motor shaft, and a transmission shaft. Here, the term "electric driving machine" means an electric machine arranged so as to provide torque to move the system S (here a vehicle), as well as possibly to recover regenerative braking torque. The operation of the GMP is supervised by a supervision computer CS.

[0034] The prime mover MME (here an electric motor) is coupled to the main battery BC via the main electrical circuit, in order to be supplied with electrical energy, as well as possibly to supply this main battery BC with electrical energy during a regenerative braking phase. It is coupled to the motor shaft, to provide it with torque by rotational drive. This motor shaft is here coupled to a reducer RD which is also coupled to the transmission shaft, itself coupled to a first train T1 (here of wheels), preferably via a differential DF.

[0035] This first train T1 is here located in the front part PVV of the vehicle S. But in a variant this first train T1 could be the one which is here referenced T2 and which is located in the rear part PRV of the vehicle S.

[0036] The operation of the driving machine MME is controlled by a machine computer CM, and supervised by the supervision computer CS.

[0037] The CV converter is also responsible, here, during the driving phases of the vehicle S for converting part of the electric current stored in the main battery BC to supply converted electrical current to the on-board network RB and the service battery BS (to recharge it). It is also, here, electrically coupled, via the main electrical circuit, to the charging connector CN of the vehicle S which, during a charging phase of the main battery BC, is, here, intended to be temporarily coupled to a power source SA external to the vehicle S, via a charging cable CR.

[0038] It will be noted, as illustrated non-limitingly in [Fig.l], that the converter CV can be part of an internal charger CH also comprising a computer CA responsible, at least, for controlling the recharges of the main battery BC.

[0039] The main battery BC may, for example, be cellular. In this case it comprises at least one cell CE, possibly electrochemical, and preferably several. For example, when each cell CE is electrochemical, it may be of the lithium-ion (or Li-ion) type. Also, for example, the main battery BC may be of the low voltage type (typically 450 V for illustration purposes). But it could be of the medium voltage or high voltage type.

[0040] It will be noted, as illustrated non-limitingly in [Fig.l], that when the main battery BC comprises several cells CE, they can be part of modules MC which are coupled together, for example in series. Here, the term “module MC” means a group of at least one cell CE. When an MC module comprises several cells CE, the latter (CE) can be coupled together in series and / or in parallel.

[0041] It will be noted that the main battery BC is associated with a battery box BB which notably comprises means for measuring, for example total voltage, cell voltage uc (constituting a charging parameter), current and internal temperature (here cell) tic (not illustrated), and a battery calculator CB. This battery calculator CB centralizes the current measurements, the voltage measurements and the cell temperature measurements (notably those which individually concern each of the N cells CE), and estimates parameters of the main battery BC as a function of these measurements, and notably its internal resistance, its minimum voltage, its charge, its state of charge (or SOC (“State Of Charge”)) total ect (constituting another charging parameter), its maximum authorized state of charge ecm, and its maximum authorized voltage (here cell) uma.It is recalled that the maximum authorized state of charge ecm and the maximum authorized voltage (here cellular) uma vary over time, and in particular depending on the aging of the main battery BC and the temperature of the air surrounding the latter (BC).

[0042] It will also be noted, as illustrated non-limitingly in [Fig.l], that the system S comprises a cooling device DR in which a heat transfer fluid circulates and which is at least responsible for cooling the main battery BC according to a (cooling) power chosen when an internal temperature (here cellular) tic becomes higher than a cooling trigger temperature tdr. Preferably, this cooling power is variable. But this is not an obligation.

[0043] It will be noted that in the example illustrated non-limitingly in [Fig.l] the cooling device DR is also responsible for cooling the (electric) motor machine MME. But this is not obligatory. This cooling device DR could also be responsible for cooling the passenger compartment (here) of the vehicle S, and in this case, it is part of the heating / air conditioning system of the vehicle S. But this is not obligatory.

[0044] It will also be noted that it is possible to implement in the system S, for example in the battery calculator CB, a procedure for reducing the charging current which is supplied to the main battery BC. This procedure (called thermal derating) consists of starting to gradually reduce the intensity of the charging current as soon as an internal temperature (here cellular) tic becomes greater than or equal to a (second) maximum temperature in the main battery BC t2 chosen, and to stop supplying the charging current when the internal temperature (here cellular) tic becomes greater than a (first) maximum temperature in the main battery BC t1 chosen and strictly greater than the second maximum temperature t2.

[0045] It will also be noted that in the example illustrated non-limitingly in [Fig.l] the vehicle S also comprises a distribution box BD to which the service battery BS, the converter CV and the on-board network RB are coupled. This distribution box BD is responsible for distributing in the on-board network RB the electrical energy which is produced by the converter CV or stored in the service battery BS, for the supply of the electrical components (or equipment) coupled to the on-board network RB, according to power supply requests received (in particular from the supervision computer CS of the GMP).

[0046] As mentioned above, the invention proposes in particular a monitoring method intended to enable monitoring in the system S (here a vehicle) of the recharges of its main battery BC as a function of the performance of the cooling of the latter (BC).

[0047] This (monitoring) method can be implemented at least partially by the monitoring device DS (illustrated in [Fig.2]) which comprises for this purpose at least one processor PR1, for example a digital signal processor (or DSP ("Digital Signal Processor")), and at least one memory MD. This monitoring device DS can therefore be produced in the form of a combination of electrical or electronic circuits or components (or "hardware") and software modules (or "software"). For example, it can be a microcontroller.

[0048] The memory MD is RAM in order to store instructions for the implementation by the processor PR1 of at least part of the monitoring method. The processor PR1 may comprise integrated (or printed) circuits, or several integrated (or printed) circuits connected by wired or wireless connections. An integrated (or printed) circuit is understood to mean any type of device capable of carrying out at least one electrical or electronic operation.

[0049] In the example illustrated non-limitingly in Figures 1 and 2, the monitoring device DS is part of the battery computer CB. But it could be part of another computer embedded in the system S (such as for example the computer CA of the internal charger CH), or could comprise its own dedicated computer.

[0050] As illustrated non-limitingly in [Fig.2], the (monitoring) method, according to the invention, comprises a step 10-40 which is implemented each time a user of the system S has triggered a recharge of the main battery BC (and therefore, here, once the recharge connector CN has been temporarily coupled to a power source SA external to the vehicle S, via a recharge cable CR).

[0051] Step 10-40 of the method comprises a sub-step 30 in which, when the maximum measured internal temperature ticmax (during a recharge) reaches a chosen temperature and a current charging parameter (available in the vehicle S, for example from the battery computer CB) is lower than a target value vc, a chosen alert message is generated (for example the monitoring device DS triggers the generation of a) and / or the cooling power of the cooling device DR is increased (for example the monitoring device DS triggers an increase in) when the latter (DR) is capable of ensuring this increase.

[0052] Thus, a kind of diagnosis of the cooling performance of the main battery BC is carried out, and action is taken accordingly when this performance is insufficient, by generating an alarm and / or by increasing the cooling capacity. It will be understood that this alert message is likely to trigger a check of the operation of the system S (here a vehicle and therefore in an after-sales service), and more precisely of its cooling device DR and / or its main battery BC, and that this increase is likely to prevent the internal temperatures (here cellular) tic from becoming too high and leading to a reduction in the lifetime and storage capacity of the main battery BC.This results in an increase in the life of the main battery BC, and / or a reduction in the number of uses of a possible procedure for reducing the recharge current supplied to the main battery BC (or thermal derating), and / or an increase in the total state of charge after a complete recharge, and therefore more frequent satisfaction of the user of the system S with regard to compliance with the desired state of charge of the . main battery BC.

[0053] Furthermore, in the event of a calibration and / or design fault, for example following a change in the physical behavior of the main battery BC due to its aging or a problem with the physical component (or hardware) of the control means of the cooling device DR, it is now possible to take this into account in real time, and thus avoid some of the premature stops in recharging.

[0054] Furthermore, the invention allows obtaining a diagnosis of the cooling performance of the main battery BC without adding electronic components and / or electronic circuit(s), and with a high ASIL (“Automotive Safety Integrity Level”) level.

[0055] For example, and as illustrated non-limitingly in [Fig. 3], step 10-40 of the method may comprise a sub-step 10 in which one (for example the monitoring device DS) can determine among all the internal temperatures (here cellular) tic measured in the main battery BC, the one which is the highest and which constitutes the maximum internal temperature measured ticmax. Then, in a sub-step 20 of step 10-40 one (for example the monitoring device DS) can compare this maximum internal temperature measured ticmax to the chosen temperature. In this sub-step 20, one (for example the monitoring device DS) can also compare a current charging parameter to the target value vc.

[0056] Then, in this sub-step 20, if the maximum measured internal temperature ticmax is lower than the chosen temperature and / or if the current charging parameter is higher than the target value vc, then one (for example the monitoring device DS) can again carry out sub-step 10 with the following maximum measured internal temperature ticmax and the following current charging parameter. It is in fact considered that the cooling performance of the main battery BC is sufficient.

[0057] On the other hand, if the maximum internal temperature measured ticmax is greater than or equal to the chosen temperature and if the current charging parameter is less than the target value vc, then one (for example the monitoring device DS) carries out sub-step 30, because it is considered that the cooling performance of the main battery BC is insufficient.

[0058] For example, the alert message may be at least intended for the user of the system S (here the driver of the vehicle). Its purpose is to ask him to have the system S checked quickly (in an after-sales service in the case of a vehicle). In this case, the alert message may be done by lighting up a warning light of the system S and / or by displaying a text message and / or by broadcasting an audible message. In the case of a vehicle S, the warning light may be part of the dashboard or be displayed on a display screen (possibly that of the central instrument panel installed on or in the dashboard). It may be a dedicated warning light or a service warning light (not dedicated). The text message can be displayed on at least one screen of the vehicle S (for example, the dashboard or the central instrument panel) or on the screen of a smartphone of the driver. The audio message can be broadcast by at least one loudspeaker of the vehicle S or of the aforementioned smartphone.

[0059] Preferably, in sub-step 30 of step 10-40, the selected alert message can be generated (for example, the monitoring device DS can trigger the generation of the) and / or the cooling power can be increased (for example, the monitoring device DS can trigger the increase of) when the cooling device DR is capable of ensuring this increase, when, moreover, there is no signal of a safety fault in the main battery BC. Such a signal is generally generated by the battery computer CB when a significant problem or incident is detected in the main battery BC, such as, for example, an electrical insulation fault (such as a short circuit) or thermal runaway.It will be understood that in the presence of such a safety fault, a shutdown of the operation of the S system is generally required and therefore there is no question of continuing the current recharge.

[0060] It will be noted that at least two different embodiments can be envisaged for the implementation of sub-step 30 (and therefore part of the operation of the monitoring device DS).

[0061] For example, in a first embodiment, in sub-step 30 of step 10-40, when the maximum measured internal (here cellular) temperature ticmax reaches a chosen temperature which is equal to the first maximum temperature tl (triggering the stopping of the supply of the recharging current) and the current charging parameter is lower than the target value vc, it is possible to increase (for example the monitoring device DS can trigger an increase in) the cooling power of the cooling device DR when the latter (DR) is capable of ensuring this increase.

[0062] It will be understood that this first embodiment requires that the cooling device DR has a variable cooling power and that the thermal derating procedure is implemented in the system S.

[0063] It will also be understood that by increasing the cooling power when the maximum measured internal (here cellular) temperature ticmax reaches the first maximum temperature tl (which causes the end of recharging), the internal (here cellular) temperatures tic will be reduced more quickly, and therefore the duration of exposure of the main battery BC to very high internal temperatures will be reduced. This not only increases the service life of the main battery BC, but also prevents the user of the system S from not being able to have the recharging power cooling of the DR cooling device for the aerothermal energy of the passenger compartment of the S system, when it uses the latter just after recharging. Indeed, in the event of an abnormally high internal temperature (here cellular) tic, all the cooling power is dedicated to the main battery BC.

[0064] Also for example, in this first embodiment, when in sub-step 30 the cooling device DR is not capable of ensuring the increase in power (for example because its power is not variable or because its current power is already maximum), step 10-40 of the method can also comprise a sub-step 40 in which the (for example the monitoring device DS can trigger the generation of the) chosen alert message can be generated and a decision can be made to use, for at least the following recharge, a temperature tdr' for triggering the cooling of the main battery BC which is strictly lower than the previous trigger temperature tdr in use.It will be understood that thus, during the next recharge, the cooling of the main battery BC will be triggered earlier (tdr' < tdr), which will be likely to reduce the duration during which the latter (BC) will have internal temperatures (here cellular) very (too) high, or even to avoid reaching the latter.

[0065] For example, the alert message may be intended at least for the user of the system S (here the driver of the vehicle), so that he can have the system S checked quickly (in an after-sales service in the case of a vehicle). But it could also be transmitted to a communication server for consideration during global analyses.

[0066] Alternatively, in a second embodiment, in sub-step 30 of step 10-40, when the maximum measured internal (here cellular) temperature ticmax reaches a chosen temperature which is equal to the second maximum temperature t2 (triggering a start of reduction of the recharge current supplied to the main battery BC) and the current charging parameter is lower than the target value vc, the chosen alert message can be generated (for example the monitoring device DS can trigger the generation of the) and this alert message can be transmitted (for example the monitoring device DS can trigger the transmission of) to a chosen communication server and / or this chosen alert message can be stored (for example the monitoring device DS can trigger the storage of) in at least one chosen memory.The latter can, for example, be part of the CB battery calculator, or it can be part of the calculator in which all the warning and malfunction messages of the S system are stored.

[0067] The transmission of the alert message to a communication server is intended in particular to allow it to be taken into account during global analyses, for example to determine whether the cooling performance problem is common to a vehicle model and / or a type of main battery and / or a type of cooling device. development, in order to remedy it. This transmission can be done via a communication module equipping the S system or the smartphone of the user of the S system (for example the driver in the case of a vehicle). Global analyses can, for example, be done by making connections with problems encountered with physical components (or hardware) of means of controlling the DR cooling device. They can also, in particular, make it possible to discover a problem with the sizing of the portion of the DR cooling device dedicated to the main BC battery and / or a calibration / design fault.

[0068] The storage of the alert message is intended in particular to allow its discovery and possible analysis by an after-sales service technician.

[0069] It should be noted that the alert message may also be intended for the user of the system S (here the driver of the vehicle), so that he can have the system S checked quickly (in an after-sales service in the case of a vehicle).

[0070] It will be noted that in step 10-40, one (for example the monitoring device DS) can use a charge parameter which is chosen from the estimated total state of charge ect of the main battery BC and the maximum (here cellular) voltage ucmax measured in the main battery BC (i.e. the cellular voltage uc which is the greatest of all those measured in the main battery BC).

[0071] It will also be noted that in step 10-40, one (for example the monitoring device DS) can use a target value vc which is equal to the difference between a maximum authorized charge parameter of the main battery BC pcmax and a chosen margin value vmc (i.e. vc = pcmax - vmc).

[0072] When the charge parameter used is the estimated total state of charge ect, the maximum authorized charge parameter pcmax is the maximum state of charge ecm (we then have vc = ecm - vmc). When the charge parameter used is the maximum voltage (here cellular) ucmax measured, the maximum authorized charge parameter pcmax is the maximum voltage (here cellular) authorized uma (we then have vc = uma - vmc).

[0073] The chosen margin value vmc can be fixed (or predefined) or variable (for example depending on the maximum authorized charge parameter pcmax and / or the chemistry of the electrochemical cells CE). Preferably, when the charge parameter used is the estimated total state of charge ect, the chosen margin value vmc is strictly greater than the possible imprecision error of the total state of charge (for example vmc can be equal to 10% in the case of NMC (“Nickel-Manganese-Cobalt”) type CE electrochemical cells or to 15% in the case of LFP (“Lithium-Iron-Phosphate”) type CE electrochemical cells). When the charge parameter used is the maximum (here cell) voltage ucmax measured and the chosen margin value vmc is fixed, the latter (vmc) can be equal to 50 mV, for example.

[0074] It will also be noted, as illustrated non-limitingly in [Fig.l], that the callus The CB battery calculator (or the DS monitoring device calculator) may also include a mass memory MM1, in particular to store each voltage (here cell) uc, each internal temperature (here cell) tic, the total state of charge ect, each state of charge (here cell) ecc, the maximum authorized state of charge ecm, and the maximum authorized voltage (here cell) uma, as well as any intermediate data involved in all its calculations and processing.Furthermore, this battery calculator CB (or the calculator of the monitoring device DS) can also comprise an input interface IE for receiving at least each voltage (here cell) uc, each internal temperature (here cell) tic, the total state of charge ect, each state of charge (here cell) ecc, the maximum authorized state of charge ecm, and the maximum authorized voltage (here cell) uma, to use them in calculations or processing, possibly after having shaped and / or demodulated and / or amplified them, in a manner known per se, by means of a digital signal processor PR2.In addition, this battery calculator CB (or the calculator of the monitoring device DS) can also include an output interface IS, in particular to deliver each alert message, each message (or order) to increase the cooling power, and each message (or order) to use, for at least the following recharge, a cooling trigger temperature tdr' strictly lower than the previous trigger temperature tdr.

[0075] It will also be noted that the invention also proposes a computer program product (or computer program) comprising a set of instructions which, when executed by processing means of the electronic circuit (or hardware) type, such as for example the processor PR1, is capable of implementing the monitoring method described above to monitor the recharges of the main battery BC equipping the system S.

Claims

Claims

1. Method for monitoring recharges of a battery (BC) having a current charging parameter and a measured maximum internal temperature, and suitable for equipping a system (S) comprising a cooling device (DR) suitable for cooling said battery (BC) according to a chosen power, characterized in that it comprises a step (10-40) in which, during a recharge when said measured maximum internal temperature reaches a chosen temperature and said current charging parameter is lower than a target value, a chosen alert message is generated and / or said power is increased when said cooling device (DR) is capable of ensuring this increase.

2. Method according to claim 1, characterized in that in said step (10-40) said selected alert message is generated and / or said power is increased when said cooling device (DR) is capable of ensuring this increase, when in addition there is no safety fault signal from said battery (BC).

3. Method according to claim 1 or 2, characterized in that in said step (10-40), when said maximum measured internal temperature reaches a chosen temperature equal to a first maximum temperature in said battery (BC) triggering a stoppage of supply of a recharging current to the latter (BC) and said current charging parameter is lower than said target value, said power is increased when said cooling device (DR) is capable of ensuring this increase.

4. Method according to claim 3, characterized in that in said step (10-40), when said cooling device (DR) is not capable of ensuring said increase in power, a chosen alert message is generated and it is decided to use for a subsequent recharge a cooling trigger temperature strictly lower than a previous trigger temperature in use.

5. Method according to claim 1 or 2, characterized in that in said step (10-40), when said maximum measured internal temperature reaches a chosen temperature equal to a second maximum temperature in said battery (BC) triggering a start of reduction of a recharge current supplied to the latter (BC) and that said current load parameter is lower than said target value, said chosen alert message is generated and the latter is transmitted to a chosen communication server and / or said chosen alert message is stored in at least one chosen memory.

6. Method according to one of claims 1 to 5, characterized in that in said step (10-40) a charging parameter chosen from an estimated state of charge of said battery (BC) and a maximum voltage measured in said battery (BC) is used.

7. Method according to one of claims 1 to 6, characterized in that in said step (10-40) a target value equal to a difference between a maximum authorized charge parameter of said battery (BC) and a chosen margin value is used.

8. Computer program product comprising a set of instructions which, when executed by processing means, is capable of implementing the monitoring method according to one of claims 1 to 7 for monitoring recharges of a battery (BC) having a current charging parameter and a maximum measured internal temperature, and capable of equipping a system (S) comprising a cooling device (DR) capable of cooling said battery (BC) according to a chosen power.

9. Monitoring device (DS) for monitoring recharges of a battery (BC) having a current charging parameter and a measured maximum internal temperature, and suitable for equipping a system (S) comprising a cooling device (DR) suitable for cooling said battery (BC) according to a chosen power, characterized in that it comprises at least one processor (PR1) and at least one memory (MD) arranged to carry out the operations consisting, during a recharge when said measured maximum internal temperature reaches a chosen temperature and said current charging parameter is lower than a target value, in triggering a generation of a chosen alert message and / or an increase in said power when said cooling device (DR) is capable of ensuring this increase.

10. System (S) comprising a battery (BC) having a current charging parameter and a maximum measured internal temperature, and a cooling device (DR) capable of cooling said battery (BC) according to a chosen power, characterized in that it further comprises a monitoring device (DS) according to claim 9.

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