Battery pack comprising a plurality of rechargeable batteries with integrated connectivity, allowing acquisition and use of data during operation

Abstract

The invention discloses a battery pack comprising a plurality of rechargeable battery cells that are mechanically and electrically connected, and also a measuring means for measuring at least one parameter of the battery and a telecommunications module, the components of said pack being integrated into a casing having power connection terminals, characterized in that - the telecommunications module comprises a controller that controls the reception and transmission of digital data between a server and the battery measuring means via the low-frequency 4G network, either using a CAT-M1 protocol or with a 2G fallback circuit, and - in that the telecommunications module comprises • a rewritable non-volatile memory for recording at least part of the computer code executed by the computer, and at least some of the digital parameters computed periodically on the basis of the data delivered by the telecommunications module • a RAM memory for recording the digital parameters computed periodically on the basis of the data delivered by the telecommunications module in a ring buffer and - in that the telecommunications module comprises a circuit for controlling the activation of the telecommunications module a) periodically so as to transmit the parameters delivered by said measuring means, b) in the event of detection of a signal transmitted by the server so as to update the computer code recorded in a memory of the measuring means, and c) when the output voltage of said rechargeable battery cells drops below a lower threshold, in order to output a digital warning message.

Description

Battery pack comprising a plurality of accumulators with integrated connectivity allowing the acquisition and exploitation of data in operation. Field of invention

[0001] The present invention relates to the field of medium-power connected smart batteries, less than one kilowatt-hour. Medium-power battery packs for equipping light electric mobility equipment, such as bicycles or electric scooters, often use lithium-based accumulator cells called "NMC, LCO, NCA, etc.", whose cell voltage is 3.6V - 3.7V and the energy density is very often > 200Wh / kg.

[0002] Other battery packs use LiFePO4 cells, with a nominal voltage of 3.2V and a lower energy density (around 120Wh / kg). These cells have the particularity of being able to carry out a greater number of cycles (> 2000 compared to > 500 in other lithium technologies) and are more stable from a safety and thermal runaway point of view. Another advantage is that this phosphate technology better withstands temperatures > 45°C and is more robust in terms of lifespan.

[0003] Their energy density is lower, and for the same size, we have a product that has a lower autonomy but sufficient for the uses made, and above all a better availability on the market. In addition, this type of battery has the following advantages:Lifespan 3 to 4 times longer than classic lithiumA much less frequent battery renewal for users and thus a positive ecological impactA more competitive price and therefore more accessible for usersSame size as a classic lithium batteryGreater availability of technologyCompatible with classic lithium applications.

[0004] Smart batteries integrate an electronic battery management system (BMS) to optimize battery operation, including charging, discharging, and managing / controlling / balancing the cells that make up the pack and battery, and to preserve it.

[0005] More recently, connected SmartBMS circuits have been proposed, allowing operating data to be collected on a server and possibly remotely controlling certain operating parameters of the cells in a battery pack. State of the art

[0006] Known in the prior art is patent US7598880 which describes a battery monitoring system, comprising: a receiver; and a plurality of wireless transmitters, each of the transmitters being connectable to a corresponding battery, the transmitters being coded to identify the corresponding battery, the transmitters being programmed to transmit data regarding the corresponding battery to the receiver, and the transmitters being further configured to connect a load across the terminals of the corresponding battery, the load being a modulated semiconductor configured to draw a current within an order of magnitude of a normal battery leakage current.

[0007] European patent EP2765643B1 describes a controller that performs wireless communication with a plurality of battery monitoring devices (BM1 - BM4) that are connected to a battery formed by connecting a plurality of battery cell groups in series with each other, and that monitor a battery condition for the respective battery cell groups (GB1), each of the plurality of battery cell groups being formed by one or a plurality of battery cells (BC1 - BC4) connected in series, wherein the controller sequentially sets communication ranges, transmission electrical powers, or antenna gains to perform wireless communication with the respective plurality of battery monitoring devices (BM1 - BM4) in an order of the potentials of the battery cell groups in the battery, to which the battery monitoring devices (BM1 - BM4) are connected,based on information set in advance, and performs wireless communication with each of the battery monitoring devices (BM1 - BM4) in accordance with the set result and assigns the identification information to each of the plurality of battery monitoring devices (BM1 - BM4) in the order of potentials.,

[0008] European patent EP2778697B1 discloses another system comprising a battery condition monitoring system and equipment provided with an assembled battery composed of a plurality of storage batteries connected in series, and a power generation facility using natural energy, wherein the battery condition monitoring system monitors a condition of each battery among the plurality of storage batteries, the battery condition monitoring system (1) comprising:a current detection unit which detects a current in each of the storage batteries;a condition measurement unit which measures a temperature, a voltage, and an internal resistance of each of the storage batteries, the internal resistance being measured using at least two or more types of frequencies, including at least a first frequency lower than 200 Hz,and a second frequency equal to or greater than 200 Hz and less than 2,000 Hz;a control unit configured to control the discharging of the storage battery to a load, and the charging of the storage battery with excess power from the power generation facility; anda main monitoring unit which is configured to acquire measurement data from the state measurement unit corresponding to each of the storage batteries, and which is configured to issue an instruction related to an operation, to the current detection unit and the state measurement unit;wherein the main monitoring unit is configured to estimate a degradation of each of the storage batteries, on the basis of at least one or more of temperature, voltage and internal resistance, measured by the state measurement unit,and a DC resistance of each of the storage batteries obtained from a ratio between a change in a current value detected by the current detection unit and a change in a voltage value measured by the state measurement unit during charging and discharging of each of the storage batteries; the main monitoring unit is configured to instruct the control unit to connect the storage battery to a discharge circuit to the load, when a measurement value of the voltage of the storage battery acquired from the state measurement unit is equal to or greater than a predetermined overdischarge prevention voltage, and to instruct the control unit to disconnect the storage battery from the discharge circuit,when the voltage measurement value is lower than the overdischarge prevention voltage; andthe main monitoring unit is configured to instruct the control unit to connect the storage battery to a charging circuit from the power generation facility when the voltage measurement value is equal to or lower than a predetermined overcharge prevention voltage, and when the voltage measurement value is higher than the overcharge prevention voltage, and a charging current value to the storage battery, detected by the current detection unit, is greater than or equal to a predetermined value, and to instruct the state measurement unit to acquire an internal resistance value of the storage battery, and is also configured to instruct the control unit to disconnect the storage battery from the charging circuit,when the voltage measurement value is higher than the overcharge prevention voltage, and when the charging current value to the storage battery detected by the current detection unit is lower than a predetermined value.Patent application EP3624297A1 discloses a battery management device comprising:a battery management unit, configured to receive information on the state of one or more battery modules and information on the state of a battery pack and transmit a control instruction to one or more cell measurement circuits (CMC 1, CMC n), wherein the battery pack comprises the one or more battery modules and the one or more battery modules contain one or more cells (Cell 1 ... Cell n); wherein the one or more cell measurement circuits are configured to collect the information on the state of the one or more battery modules,transmitting the status information of the one or more battery modules to the battery management unit, and receiving and executing the control instruction transmitted from the battery management unit;one or more detection units, configured to collect the status information of the battery pack and transmit the status information of the battery pack to the battery management unit.A wireless communication unit is provided in the battery management unit, and a wireless communication unit is provided in at least one cell measurement circuit of the one or more cell measurement circuits (CMC 1 ... CMC n), such that the battery management unit is connected to at least one cell measurement circuit of the one or more cell measurement circuits by wireless communication,and / or a wireless communication unit is provided in at least one sensing unit of the one or more sensing units, such that the battery management unit is connected to at least one sensing unit of the one or more sensing units by wireless communication; andwhen a first functional unit fails to communicate with the battery management unit, the first functional unit is configured to establish a wireless communication connection with a second functional unit and communicate with the battery management unit via the second functional unit; orwhen a first functional unit fails to communicate with the battery management unit,the first functional unit is configured to change the communication frequency with the battery management unit and reestablish wireless communication with the battery management unit; wherein the first functional unit is any one of one or more sensing units or one or more cell measurement circuits (CMC 1 ... CMC n) having a wireless communication unit disposed therein, and the second functional unit is any one of one or more sensing units or one or more cell measurement circuits (CMC 1 ... CMC n) having a wireless communication unit disposed therein, other than the first functional unit., Disadvantages of the prior art

[0009] The prior art solutions are not entirely satisfactory because the communication module constitutes a source of significant electrical consumption, which degrades the nominal capacities of the battery pack, due to the continuous consumption of the telecommunication module, even when the main battery load is switched off. For equipment likely to remain unused for a prolonged period, the prior art solutions result in significant residual consumption leading to a discharge even when the equipment is at rest.

[0010] This situation is particularly detrimental for battery packs using LiFePO4 cells, whose energy performance is slightly lower than that of lithium-based batteries but which are of interest because they accept a greater number of charges / discharges.

[0011] Furthermore, for light mobility equipment likely to move in areas where telecommunications network coverage is imperfect, known solutions lead to loss of connection and therefore of information. Solution provided by the invention

[0012] In order to address these drawbacks, the invention relates, in its most general sense, to a battery pack comprising a plurality of accumulator cells mechanically and electrically connected, as well as a means for measuring at least one parameter of the battery and a telecommunications module, the components of said pack being integrated into a housing having power connection terminals, characterized in that said telecommunications module comprises a controller controlling the reception and transmission of digital data between a server and said battery measurement means via the low-frequency 4G network, either using a CAT-M1 type protocol or with a 2G fallback circuit, and in that said telecommunications module comprises a rewritable non-volatile memory for recording at least part of the computer code executed by said computer,as well as at least part of the digital parameters calculated periodically based on the data supplied by said telecommunication modulea RAM type memory for recording the digital parameters calculated periodically based on the data supplied by said telecommunication module in a circular buffer.said telecommunication module comprises a circuit for controlling the activation of the telecommunication module:,

[0013] (a) periodically for the transmission of the parameters provided by said measuring means,

[0014] (b) in the event of detection of a signal emitted by said server for updating the computer code recorded in a memory of said measuring means and

[0015] (c) when the output voltage of said accumulator cells falls below a low threshold, to emit a digital warning message.

[0016] According to variants, said means for measuring at least one parameter of the battery comprises

[0017] - a temperature sensor

[0018] - and / or a current sensor

[0019] -and / or a voltage sensor.

[0020] According to another variant, said measuring means is connected to the battery management system (103) (BMS).

[0021] Advantageously, said measuring means comprises a geolocation module and / or a means for controlling the disconnection of the accumulator cells upon receipt of a digital message transmitted by a server.

[0022] For mobility applications, the accumulator cells are advantageously of the lithium iron phosphate type.

[0023] The invention also relates to a telecommunications module for the remote transmission of digital information originating from an electronic circuit for measuring at least one battery parameter, characterized in that it comprises a controller controlling the reception and transmission of digital data between a server and said electronic circuit for measuring at least one battery parameter via the low-frequency 4G network, either using a CAT-M1 type protocol or with a 2G fallback circuit, and a set of memories comprising: a rewritable non-volatile memory for recording at least part of the computer code executed by said calculator,as well as at least part of the digital parameters calculated periodically based on the data provided by said telecommunications modulea RAM type memory for recording the digital parameters calculated periodically based on the data provided by said telecommunications module in a circular bufferand,

[0024] a control circuit for activating the telecommunications module

[0025] (a) periodically for the transmission of the parameters provided by said measuring means,

[0026] (b) in the event of detection of a signal emitted by said server for updating the computer code recorded in a memory of said measuring means and

[0027] (c) when the output voltage of said accumulator cells falls below a low threshold, to emit a digital warning message.

[0028] Such a module makes it possible to equip a simple battery to provide new functionalities.

[0029] According to another variant, said telecommunications module further comprises means for controlling the disconnection of the accumulator cells upon receipt of a digital message transmitted by a server.

[0030] The invention also relates to a method for remote transmission of digital information originating from a means for measuring at least one parameter of a battery, characterized in that it comprises:periodic steps of acquisition, during a parameterized period T, of digital data originating from said means for measuring and calculating parameters as a function of said digital data;steps of storage of said parameters at the end of each period in a circular buffer;periodic steps of activation of a modem, periodic transmission to a server of the content of said circular buffer in the form of a digital message according to the http protocol, the header of which includes in particular the size of the content, and erasure of said buffer after receipt of an acknowledgment signal by said server and switching off of said modem at the end of each transmission step.Detailed description of a non-limiting example of embodiment

[0031] The present invention will be better understood on reading the following description, concerning a non-limiting example of embodiment illustrated by the appended drawings where:

[0032] Shows an exploded view of an example of a battery pack according to the invention

[0033] The diagram represents the system block diagram of the software bricks of a battery pack according to the invention and its user interface. General principle of the invention

[0034] The battery pack shown as a non-limiting example is constituted by a housing (1) integrating an assembly of accumulator cells (2) held by wedging plates (3, 4) having circular housings for the insertion of the ends of the accumulator cells (2). Conductive tracks (5, 6) provide the electrical connections between the poles of the cells, in a known manner. The accumulator cells are LiFePO4 cells, with a nominal voltage of 3.2V and a lower energy density (of the order of 120Wh / kg). These cells have the particularity of being able to carry out a greater number of cycles (> 2000 compared to > 500 in other lithium technologies) and are more stable from a safety and thermal runaway point of view.

[0035] The housing (1) also integrates an electronic card (7) of an electronic battery management circuit, as well as a radiocommunication module (8) comprising a modem, a radiofrequency stage and an electronic circuit controlling the acquisition and processing of data coming from the electronic battery management circuit (7) as well as the control of remote transmission by the radiofrequency stage. This module (8) is intended to be able to collect information on a battery of any technology, to transmit them remotely via the 4G / LTE network with a fallback option in 2G in the event of network weakness.

[0036] Module 8 and electronic card 7 can be merged onto a single card

[0037] All this data is collected and displayed on a monitoring platform, thus enabling data analysis.

[0038] The card (7) allows data to be recovered in the form of analog quantities (Voltage, current and two temperatures).

[0039] The card (7) is connected directly to the battery via the electrical tracks (5, 6), and has been optimized to consume the minimum energy. The recovered data is sent periodically to the platform using a 4G / LTE connection with integrated 2G fallback. The sampling period of the physical quantities as well as the transmission period on the platform can be modified remotely via a configuration file that is made available and which can be independent for each connected card. This makes it possible to refine and optimize the consumption of the card according to customer use and the volume of data required for a good analysis.

[0040] It is also possible to update the card's application software (firmware) remotely by making the file available on the platform.

[0041] The platform allows you to visualize the evolution of voltage, current and temperatures over time in the form of a curve.

[0042] It also allows you to view the card's application software (firmware) version and the configuration file version. A battery status is also sent to show whether the battery still has sufficient voltage to transmit, or whether transmission is interrupted due to low battery voltage.

[0043] Alerts can be set for each card, allowing you to be informed of sudden changes in the LiFePO4 battery, which has lower energy performance than batteries using cells

[0044] Optionally, the module (8) also includes a geolocation functionality, via the sending of GPS coordinates to the platform, to transmit a position at a given moment, with visualization on a terrestrial map. A less precise and less expensive solution which also allows this option to be realized is triangulation via the LTE antennas present nearby.

[0045] An “anti-theft” system, allowing detection if a customer’s device is stolen, to be able to prohibit the use of the battery

[0046] The integration of digital data uploads, when the IoT card is coupled with a BMS. This would allow for the analysis of a larger amount of data, and thus enable the adaptation of the BMS parameters according to use cases and constraints, particularly temperature. Operation of the remote transmission module

[0047] It represents a system synopsis of the software bricks of the computer code (25) of the system including a battery pack and a server (100) (in English firmware).

[0048] It includes a set of codes controlling the operation of the telecommunications module. This module is made up of the following sub-assemblies: A radio frequency stage (10) for transmitting and receiving on a low-power wide area network (Low Power Wide Area Network or LPWAN) using the low 800 MHz frequency of the 4G standard with the LTE-M protocol, (eMTC (enhanced Machine Type Communication) or LTE Cat M1) with a fallback function to the second generation 2G standard with a frequency of 900 MHz for example A MicroSIM or NanoSIM card (11) Two drivers of the radio frequency stage (10), respectively a GSM driver (12) and an LPWAN driver (13) intended to exploit the instructions coming from a brick calculating the Hays commands (AT Commands in English) to provide commands in the Hays language.

[0049] The embedded software (firmware) is stored in a rewritable memory (15), and can be updated by downloading a microcode transmitted by the server (100).

[0050] The data provided by the BMS battery management circuit (103) consists of temperature variables, for example temperature of the cell assembly (2) and external temperature of the case, voltage and current. These variables are digitized by an ADC converter (30). Analog acquisitions are periodic by the measurement module. The RAW values ​​are converted into physical quantities with the ratios (readable in mesure.c and mesure.h.

[0051] An offset is added to this value; this offset is modified through the configuration. It is characterized on each card. This offset can be positive or negative and corresponds to the correction to be made to the measurement in mV.

[0052] These data are then sampled at a frequency set by a clock (35) and transformed by a calculation (31) of a parameter depending on the sampled values, for example a maximum or minimum value. These parameters are recorded in sequential form in a historical file (33) of log file type.

[0053] During each acquisition, the minimum, maximum and average values ​​are updated. When the calculation period is over, these values ​​are frozen and then stored in RAM while awaiting transmission to the server.

[0054] The calculation period is not integrated in terms of timescales but is converted into the number of samples. For example, if we have a measurement acquisition every second, and a calculation at 60 s, then we will wait 60 samples to perform the calculation step. Therefore, the value defined in calculation must be a multiple of the measurement period.

[0055] As soon as at least one of the physical measurements requires a calculation phase, the result is stored in a log. If several measurements have different calculation periods from each other, then the log will integrate the data of the measurements where the calculation is done at the same time.

[0056] Example: If current / voltage has a calculation done every 10s while for temperature the calculation is done every 30s, then: log at t = 10s will contain current / voltage log at t = 20s will contain current / voltage log at t = 30s will contain current / voltage, temperature

[0057] If the calculation periods do not have a common divisor, there will be even more logs to store.

[0058] If the voltage / current calculation period is done every 15 seconds and the temperature period is done every 18 seconds then we will have: log at t = 15 s will contain current / voltage log at t = 18 s will contain temperature log at t = 30 s will contain current / voltage log at t = 36 s will contain temperature

[0059] Log storage is done using a circular buffer. This allows the oldest logs to be overwritten by new ones when the stored amount of logs is reached.

[0060] Log storage allows for up to 1440 samples to be stored (1 measurement / min for 24 hours). However, when exported, only the most recent 1420 samples will be transmitted to avoid corrupting the information when new calculations are stored during transmission to the server.

[0061] Since these measurements are in RAM (SRAM2 block), each time the product is reset, the data present will be lost. This happens: When the battery level is low after a final upload of the remaining data When the battery level is critical When the watchdog is triggered When the power supply is removed

[0062] A cache memory (40) stores the latest values ​​in a non-volatile memory and provides data buffering between the BMS circuit (103) and the telecommunications module.

[0063] The data is grouped (21) according to a predefined format, then transferred (22) to the software brick (14) calculating the AT commands.

[0064] The microcontroller includes a very low-power standby zone (50), which can be reactivated by detecting a signal from the server, for example.

[0065] The server interface (100) allows data to be retrieved and used, and the embedded software to be reprogrammed, using a debugger (101) and an analyzer (102) using RTT (Real-Time Transfer) technology, for example SEGGER-RTT (trade name).

[0066] The collected data is recorded in a non-volatile NVMEM (“Non Volatile Memory layer”) memory (110), for example an SSD disk and used by a configuration tool (104) which can be queried on the command line using a command line interface (ILC) (105) for communication between the user and the computer is carried out in text mode: the user types a command line, i.e. text on the keyboard to ask the computer to perform an operation.

[0067] For example, the remote transmission module includes: FLASH memories for: recording the launch code (bootloader) of the program contained in the microcontroller when it is powered up the code controlling the exchanges between the launch code and the embedded application consisting of a data structure which is written by the embedded software before a software restart, so that it is intercepted by the launch code, which resets them when the associated processes are carried out a download area whose size corresponds to the size of the area containing the embedded application and the area containing the configuration data the code of the embedded application the reconfigurable configuration data and identifiers a RAM memory, of the SRAM type for recording data coming from the battery management circuit (103), for example 96 kB a preserved memory RAM2 of the CCM-RAM type, of smaller capacity,for example 32 kB. In the case of deep sleep, an internal circuit in the microcontroller allows its contents to be preserved without being altered.

[0068] The bootloader is responsible for starting the embedded software that was previously installed and programmed in production (or by programming probe). It is the actual entry point of the application. It is also responsible for installing new embedded software and / or a new configuration downloaded and marked as “to be installed” in the exchange area. Radiofrequency stages (Modem)

[0069] The modem module handles communication with the remote server via the modem present on the product. Communication between the processor and the modem is done via UART (115200, 8 bits, 1 stop bit, no parity) and communication with the server is done in HTTP 1.0.

[0070] The module handles the following functions: Powering up the modem and logic level adapter Initializing the UART protocol Monitoring the 1V8 voltage generated by the modem to check its power-up Creating AT commands to communicate with the modem Managing the SIM card Retrieving modem information (IP, IMEI, Software version, Module version) Checking network connection Opening Socket Lightweight HTTP engine to generate HTTP requests Creating and formatting the data to be transmitted to the server in JSON format Downloading an update manifest from the server, then downloading a new configuration or a new firmware Software and electronic shutdown of the modem Cutting and de-initializing the power supplies / communication protocol with the modem.

[0071] All of this code is concentrated in the following files:modem.c / .h for the module part with the management of the state machine of the modemmusart.c / .h which manages the UART Hardware part of the CPU.modem_frame.c / .h which manages the JSON engine to format the frame to be uploadedAs an example, the modem module is used during three specific events:Periodically, according to the value specified under “upload_period” which allows the upload of measurement information. The frame is of type “MEASURE”The processing of the OTA (Over-The-Air) update is carried out after each upload of information.When the supply voltage falls below the low threshold. A final message integrating all the available measurements is sent to the server before shutdown and standby. The frame is of type “LOW_BATT”

[0072] The HTTP protocol requires sending a header before sending the content. This header includes a lot of information such as the HTTP method, version, server URI, etc., but also the exact size of the content.

[0073] Since the controller does not offer unlimited resources to store the entire frame to be uploaded in memory (up to 200 KB), it is necessary to segment the message.

[0074] Furthermore, this frame is generated dynamically (the sizes of the fields evolve according to their values), so it is impossible to predetermine the size of the final content without doing the exercise of generating it. This is why the generation of the frame is executed twice. The first time, empty (i.e. without transmission), which allows to determine and measure the size of the frame to be uploaded and a second time where the content is sent to the modem (and therefore to the open HTTP socket). This requires a significant amount of time (< 10 seconds). It is for this reason that, at the time of the first iteration, the list of logs to be uploaded is “frozen” by sending at most the 1420 most recent logs out of the 1440 available in order to avoid any risk of modification of the content of the frame between the two iterations.

[0075] The modem startup, data transmission, and shutdown sequence lasts between 30 and 120 seconds. In the event of a failed upload (no network, communication error), the logs are not overwritten and will be sent again during the new upload period, incorporating the most recent measurements.

[0076] Following this failure, the recovery of update data (JSON manifest) is still carried out if it is not linked to a network connection problem. Sequencer module:

[0077] A sequencer (34) ensures the sequencing of the different tasks to be carried out: Whether it is the acquisition of the physical quantity, the calculation through the transmission of the measurements to the server, they are all managed by this sequencer (34).

[0078] This sequencer (34) relies on the microcontroller's internal RTC supported by its Qwartz Low Frequency 32768 Hz. The RTC has been accelerated to run at 16 Hz generating a tick of 62.5 ms.

[0079] It uses the alarm linked to the calendar of this RTC to set the next alarms and launch the scheduled tasks. Server connectivity

[0080] Connectivity to the server is provided by a 4G or LTE-M solution through the Telit LE-910 / ME-910 modules. The latter is orchestrated by the main processor through UART communication (115200, 8 bits, 1 stop bit, no parity). Periodically, the modem will be powered and will transmit all the measurements stored in RAM (up to 1420).

[0081] Theoretically, there are 1440 samples saved but to protect against processing times during data uploads and consequently the risk of overwriting previous measurements, only the most recent 1420 will be uploaded to guarantee their integrity.

[0082] Communication to the server is done via HTTP using the Socket mechanism offered by the modem. The latter uses the HTTP 1.0 protocol and uses the POST method to push data up and GET to retrieve OTA update files. Use of the invention

[0083] A connected battery according to the invention makes it possible to:Collect operating data from our products in real-life field applications (voltage, current, temperature)Transmit data to the platformOptimize products for real-life usage conditions by analyzing this dataDiagnose and analyze operating deviations or malfunctions remotelyGive our customers access to the behavior of our products in their applicationManage alerts for preventive or curative interventionsPossibility of monitoring consumption in real time and therefore offering a “leasing” / “rental” / “sale of Wh” serviceVariant concerning the measurement of battery parameters

[0084] In the above-mentioned embodiment, the operating parameters of the battery are obtained by reading the data available on a battery management circuit (BMS) ensuring in particular the balancing of each cell contained in a battery according to parameters such as current, voltage and temperature. These parameters can be acquired by the measuring means by reading the registers of the BMS memory.

[0085] For batteries without a BMS, the reading means is constituted by an independent circuit or integrated into the telecommunications circuit, receiving signals from a temperature sensor, or measuring the voltage and / or current for each of the cells or for the battery.

Claims

Battery pack comprising a plurality of accumulator cells (2) mechanically and electrically connected, as well as a means for measuring at least one parameter of the battery and a telecommunications module, the components of said pack being integrated in a housing (1) having power connection terminals characterized in that said telecommunications module comprising a controller controlling the reception and transmission of digital data between a server and said means for measuring the battery via the low-frequency 4G network, either using a CAT-M1 type protocol or with a 2G fallback circuit, and in that said telecommunications module comprises a rewritable non-volatile memory for recording at least part of the computer code executed by said computer,as well as at least part of the digital parameters calculated periodically as a function of the data provided by said telecommunication modulea RAM type memory for recording the digital parameters calculated periodically as a function of the data provided by said telecommunication module in a circular bufferand in that said telecommunication module comprises a circuit for controlling the activation of the telecommunication moduleperiodically for the transmission of the parameters provided by said measuring means, in the event of detection of a signal emitted by said server for the updating of the computer code recorded in a memory of said measuring means and when the output voltage of said accumulator cells falls below a low threshold, to emit a digital warning message., Battery pack according to claim 1 characterized in that said means for measuring at least one parameter of the battery comprises a temperature sensor. Battery pack according to claim 1 characterized in that said means for measuring at least one parameter of the battery comprises a current sensor. Battery pack according to claim 1 characterized in that said means for measuring at least one parameter of the battery comprises a voltage sensor. Battery pack according to claim 1 characterized in that said measuring means is connected to the storage battery management system (103) (BMS). Battery pack according to claim 1 characterized in that said measuring means comprises a geolocation module. Battery pack according to claim 1 characterized in that said telecommunication module further comprises means for controlling the disconnection of the accumulator cells upon receipt of a digital message transmitted by a server. Battery pack according to claim 1 characterized in that said accumulator cells are of the lithium iron phosphate type. Telecommunication module for the remote transmission of digital information from an electronic circuit for measuring at least one battery parameter, characterized in that it comprises: a controller controlling the reception and transmission of digital data between a server and said electronic circuit for measuring at least one battery parameter via the low-frequency 4G network, either using a CAT-M1 type protocol or with a 2G fallback circuit, and a set of memories comprising: a rewritable non-volatile memory for recording at least part of the computer code executed by said calculator,as well as at least part of the digital parameters calculated periodically based on the data supplied by said telecommunication modulea RAM type memory for recording the digital parameters calculated periodically based on the data supplied by said telecommunication module in a circular bufferanda circuit for controlling the activation of the telecommunication moduleperiodically for the transmission of the parameters supplied by said measuring means, in the event of detection of a signal emitted by said server for updating the computer code recorded in a memory of said measuring means and when the output voltage of said accumulator cells falls below a low threshold, to emit a digital warning message.,

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