Battery cell temperature signal acquisition system in power battery pack

Abstract

The utility model discloses a battery cell temperature signal acquisition system in a power battery pack. The battery cell temperature signal acquisition system comprises a fiber bragg grating temperature measurement sensor, a temperature acquisition module and a BMS (Battery Management System) controller, the output end of the fiber bragg grating temperature sensor is connected to the temperature acquisition module through an optical fiber signal line, the fiber bragg grating temperature sensor is used for acquiring temperature data of a battery cell in a battery pack, a signal of the fiber bragg grating temperature sensor is transmitted to the temperature acquisition module through the optical fiber signal line, and the temperature acquisition module is connected to the BMS controller through a CAN communication line. The temperature sensor is used for uploading the collected temperature data to the BMS controller. The utility model has the advantages that the optical fiber is adopted to transmit and collect the battery cell temperature data, the accuracy and response speed of the battery cell temperature data collection are improved, a thermal runaway control strategy for a controller to quickly respond according to the temperature is provided, and the accuracy and reliability of battery cell temperature management are improved.

Description

Technical Field

[0001] This utility model relates to the field of marine power battery packs, and in particular to a cell temperature signal acquisition system for a power battery pack. Background Technology

[0002] In existing technologies, the temperature of each cell within a power battery pack needs to be monitored. The main purpose of this monitoring is to manage thermal runaway within the cells. By monitoring the cell temperature, thermal runaway can be detected and addressed promptly, thereby improving the safety of the power battery and avoiding or reducing safety accidents such as fires caused by thermal runaway. For example, a temperature acquisition module, battery pack, and vehicle according to patent application number 202222117038.X include a housing and a temperature acquisition component. The housing is connected to the cell and has a receiving groove to form a cavity with the cell. The temperature acquisition component is disposed within the receiving groove and has a heat-conducting surface for contacting the outer wall of the cell, enabling stable contact with the cell and more accurate temperature acquisition. This method can accurately obtain the cell temperature data.

[0003] However, current technology involves transmitting temperature data to the BMS (Battery Management System). Traditional data acquisition and transmission methods do not consider signal interference resistance and response speed. For example, current technology uses traditional wire harnesses or FPC (Flexible Printed Circuit) circuit boards combined with thermocouples to collect cell temperature inside power battery packs. Temperature is collected through the thermoelectric effect of thermocouples. This solution is susceptible to external environmental interference. To ensure accurate temperature, shielding protection is required, which increases costs and space requirements. Furthermore, the temperature acquisition accuracy is low and the response speed is slow. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a battery cell temperature signal acquisition system for power battery packs. This system uses optical fiber to transmit and acquire battery cell temperature data, thereby improving the accuracy and response speed of battery cell temperature data acquisition.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a cell temperature signal acquisition system in a power battery pack, comprising a fiber optic temperature sensor, a temperature acquisition module, and a BMS controller;

[0006] The output of the fiber optic temperature sensor is connected to the temperature acquisition module via an optical fiber signal line. The fiber optic temperature sensor is used to collect temperature data of the cells in the battery pack. Its signal is transmitted to the temperature acquisition module via the optical fiber signal line. The temperature acquisition module is connected to the BMS controller via a CAN communication line to upload the collected temperature data to the BMS controller.

[0007] Each fiber Bragg grating temperature sensor corresponds to a battery cell. Each fiber Bragg grating temperature sensor is used to collect temperature data for one battery cell. It converts the collected temperature data into an optical signal and transmits it to the temperature acquisition module via an optical fiber signal line.

[0008] The temperature acquisition module includes one or more modules, each temperature acquisition module corresponds to multiple fiber Bragg grating temperature sensors, and each temperature acquisition module is connected to the BMS controller via a CAN communication line.

[0009] The temperature acquisition module includes a photoelectric converter, a data processor, and a CAN transceiver; wherein the photoelectric converter receives optical signals transmitted via an optical fiber signal line and converts them into electrical signals; the output end of the photoelectric converter is connected to the data processor, and the output end of the data processor is connected to the CAN communication line via the CAN transceiver; the CAN transceiver is used to convert the signals output by the data processor into CAN signals and transmit them to the BMS controller via the CAN communication line.

[0010] The output of the BMS controller is connected to the alarm module to trigger an alarm for the loss of the cell temperature signal.

[0011] The battery pack is equipped with a collision sensor, the output of which is connected to the BMS controller; the BMS controller determines whether to issue an alarm signal based on the collected abnormal temperature signal and collision signal.

[0012] The advantages of this invention are: it uses optical fiber to transmit and collect cell temperature data, which improves the accuracy and response speed of cell temperature data acquisition, provides a thermal runaway control strategy for the controller to respond quickly according to temperature, and improves the accuracy and reliability of cell temperature management. Attached Figure Description

[0013] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0014] Figure 1 This is a schematic diagram of the structural principle of the data acquisition system of this utility model.

[0015] The labels in the figure are as follows: 1. Fiber optic signal line; 2. Fiber optic grating temperature sensor; 3. Power battery cell; 4. Temperature acquisition module; 5. Power battery pack; 6. CAN communication line; 7. BMS controller. Detailed Implementation

[0016] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0017] This embodiment provides a cell temperature signal acquisition system within a power battery pack. Temperature data is acquired using fiber optic grating (FBG) sensors and transmitted via optical fiber to the BMS controller, thereby improving data transmission speed, reducing interference, and achieving advantages such as electromagnetic interference resistance, high temperature accuracy, and rapid response. After data transmission, the temperature acquisition module aggregates and converts the data into a CAN signal before sending it to the BMS controller, which then implements thermal runaway control strategies within the battery pack. Inside the power battery pack, fiber optic grating (FBG) sensors are fixed to the outer surface of each cell. The sensors acquire temperature data via optical fiber and a temperature acquisition template. The temperature acquisition module communicates with the main BMS via twisted-pair CAN communication. This solution offers advantages such as no calibration required, electromagnetic interference resistance, high temperature measurement accuracy, and fast response speed. This solution can be widely applied to temperature signal acquisition within power battery packs in passenger vehicles, commercial vehicles, ships, and large-scale energy storage systems.

[0018] like Figure 1 As shown in the figure, a cell temperature signal acquisition system in a power battery pack according to this embodiment includes a fiber optic temperature sensor, a temperature acquisition module and a BMS controller.

[0019] The output of the fiber optic temperature sensor is connected to the temperature acquisition module via an optical fiber signal line. The fiber optic temperature sensor is used to collect temperature data of the cells in the battery pack. Its signal is transmitted to the temperature acquisition module via the optical fiber signal line. The temperature acquisition module is connected to the BMS controller via a CAN communication line to upload the collected temperature data to the BMS controller.

[0020] The fiber optic temperature sensor is used to collect temperature data for each battery cell. The collected temperature data is sent to the fiber optic transmission line as an optical signal. The collected temperature data is transmitted to the signal acquisition module via the optical signal. The signal acquisition module acquires the optical signal and converts it into an electrical signal and then a CAN signal. Finally, it transmits the converted temperature data to the BMS controller via the CAN data line. This process realizes the acquisition, transmission, conversion, and transmission of temperature data to the BMS controller.

[0021] In this embodiment, the fiber Bragg grating temperature sensor is paired with a battery cell in a one-to-one manner. Each fiber Bragg grating temperature sensor is used to collect the temperature data of one battery cell. It converts the collected temperature data into an optical signal and transmits it to the temperature acquisition module via an optical fiber signal line. This achieves a one-to-one correspondence between the temperature sensor and the battery cell, ensuring reliable temperature measurement.

[0022] The temperature acquisition module comprises one or more modules, each corresponding to multiple fiber Bragg grating temperature sensors. Each module is connected to the BMS controller via a CAN communication line. The temperature acquisition module is used to convert optical signals to electrical signals. Considering data processing capabilities, replaceability, and ease of maintenance, multiple temperature acquisition modules are configured, with each module acquiring data from a specific number of corresponding fiber Bragg grating temperature sensors.

[0023] The temperature acquisition module converts optical temperature measurement signals into electrical and CAN signals before sending them to the BMS controller. Its components include a photoelectric converter, a data processor, and a CAN transceiver. The photoelectric converter receives optical signals transmitted via an optical fiber signal line and converts them into electrical signals. The output of the photoelectric converter is connected to the data processor, and the output of the data processor is connected to the CAN communication line via the CAN transceiver. The CAN transceiver converts the signal output by the data processor into a CAN signal and transmits it to the BMS controller via the CAN communication line. The optical signal is sent to the photoelectric converter, which converts it into an electrical signal. The electrical signal is then sent to the data processor, which can recognize the electrical signal. The data processor then uses the CAN transceiver to convert the electrical signal into a CAN signal that the BMS can recognize, and then transmits it to the BMS controller via the CAN line. The BMS then monitors the temperature of the cells within the battery pack according to its own battery pack thermal management strategy.

[0024] In this embodiment, the output of the BMS controller is connected to an alarm module to trigger an alarm for the loss of cell temperature signals. If the temperature data of one of the cells is lost due to a collision or other circumstances, and the BMS does not receive this data, it will issue an alarm to promptly remind the user to perform maintenance, thus avoiding safety hazards caused by the loss of temperature monitoring data. The alarm module can be implemented using an in-vehicle instrument panel or a central control system.

[0025] In a preferred embodiment, a collision sensor is installed on the battery pack, and the output of the collision sensor is connected to the BMS controller. The BMS controller determines whether to issue an alarm signal based on the collected abnormal temperature signal and the collision signal. Since this solution uses fiber optic transmission, fiber optic transmission is prone to data fluctuations when the fiber optic cable breaks due to collisions, which can lead to incorrect thermal runaway strategies. Therefore, when a collision is detected, while executing the collision strategy, an alarm signal is issued based on the temperature measurement data before and after the collision. If the temperature signal fluctuates for a short time after the collision but quickly returns to normal, no alarm is issued; otherwise, an alarm is issued. This identifies small collisions and avoids false alarms caused by signal fluctuations due to small collisions.

[0026] By adopting the above scheme, this application can achieve advantages such as no calibration required, resistance to electromagnetic interference, high temperature measurement accuracy, and fast response speed. It can be widely used in the acquisition of internal temperature signals of power battery packs in passenger cars, commercial vehicles, ships, and large-scale energy storage.

[0027] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A power battery pack cell temperature signal acquisition system, characterized in that: The temperature measuring sensor includes a fiber grating temperature measuring sensor, a temperature collecting module and a BMS controller. An output end of the fiber grating temperature measuring sensor is connected to the temperature collecting module through a fiber signal line, the fiber grating temperature measuring sensor is used to collect temperature data of the battery cell in the battery pack, the signal is transmitted to the temperature collecting module through the fiber signal line, and the temperature collecting module is connected to the BMS controller through a CAN communication line to upload the collected temperature data to the BMS controller.

2. The temperature signal acquisition system for battery cells in a power battery pack according to claim 1, characterized in that: The fiber grating temperature measuring sensor corresponds to the battery cell one by one, each fiber grating temperature measuring sensor is used to collect temperature data of one battery cell, and the collected temperature data is converted into an optical signal and transmitted to the temperature collecting module through the fiber signal line.

3. The temperature signal acquisition system for battery cells in a power battery pack of claim 1, wherein: The temperature collecting module includes one or more, each temperature collecting module corresponds to a plurality of fiber grating temperature measuring sensors, and each temperature collecting module is connected to the BMS controller through a CAN communication line.

4. The temperature signal acquisition system for battery cells in a power battery pack according to any one of claims 1-3, characterized in that: The temperature collecting module includes a photoelectric converter, a data processor and a CAN transceiver; the photoelectric converter receives the optical signal transmitted through the fiber signal line and converts it into an electrical signal; an output end of the photoelectric converter is connected to the data processor, an output end of the data processor is connected to the CAN communication line through the CAN transceiver, and the CAN transceiver is used to convert the signal output by the data processor into a CAN signal and transmit it to the BMS controller through the CAN communication line.

5. The temperature signal acquisition system for battery cells in a power battery pack according to any one of claims 1-3, characterized in that: An output end of the BMS controller is connected to the alarm module to alarm the loss of the battery cell temperature signal.

6. The temperature signal acquisition system for battery cells in a power battery pack according to claim 5, characterized in that: A collision sensor is arranged on the battery pack, an output end of the collision sensor is connected to the BMS controller, and the BMS controller judges whether to send an alarm signal based on the collected temperature abnormal signal and the collision signal.

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