Vehicle battery collision detection device and electric vehicle

Abstract

The utility model provides a vehicle battery collision detection device and an electric vehicle. The vehicle battery collision detection device comprises a flexible pressure sensor, a pressure signal processing module, a control module, a communication module and a power supply module, the flexible pressure sensors are arranged at the bottom of the vehicle battery in a global or array mode and used for capturing changes of collision pressure borne by the lower surface of the battery and converting the pressure changes into electric signals; the pressure signal processing module is used for collecting the electric signal of the flexible pressure sensor, processing the electric signal and converting the electric signal into a pressure signal; the control module is used for receiving the pressure signal and obtaining pressure distribution data of the flexible pressure sensor; the communication module is used for transmitting the pressure distribution data to a vehicle machine system or a cloud server of the vehicle; the power supply module is used for providing power. An electric vehicle is provided with a vehicle battery collision detection device. According to the utility model, the pressure condition when the battery is collided can be completely reflected.

Description

Technical Field

[0001] This utility model relates to the field of vehicle battery safety monitoring technology, specifically to a vehicle battery collision detection device and an electric vehicle. Background Technology

[0002] With the increasing popularity of electric vehicles, battery safety has become a critical concern, and battery safety in collision accidents has become an important research direction. Besides the potential dangers of overheating, short circuits, or fires during charging and discharging, collisions can also damage the internal structure of the battery, leading to equally serious consequences. Therefore, ensuring battery safety is not only related to vehicle performance and lifespan but also directly impacts the safety of passengers and pedestrians, making the development of effective battery testing technologies crucial.

[0003] While the Battery Management System (BMS) in electric vehicles can monitor battery status in real time, incidents of spontaneous combustion following collisions still occur frequently. The cause of these fires is likely damage to the battery's internal structure caused by the collision. After a collision damages the battery's internal structure, spontaneous combustion typically occurs after a period of time. Therefore, detecting collision-induced battery damage is crucial.

[0004] In the prior art, Chinese utility model patent CN221315809U discloses a battery pack collision detection device, including a bottom protective plate, a plate control unit, multiple sensors, and wires. The upper surface of the bottom protective plate has a detection area facing the battery pack housing. Multiple sensors are arranged at intervals in the detection area and are respectively connected to the control unit, so that the sensor located at the collision position of the battery pack sends an alarm signal to the control unit. The multiple sensors are divided into at least one group, and each group of sensors is connected in series by a wire to form a detection unit. Each detection unit forms a closed loop with the control unit, and the closed loop is broken when the battery pack is deformed. Although this battery pack collision detection device solves the problem of accurately determining whether the battery pack has collided and locating the collision position, it still requires multiple sensors and wires to form a sensor network, and still cannot fully reflect the pressure state of the battery when it is impacted.

[0005] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a vehicle battery collision detection device and an electric vehicle to accurately determine whether the battery has been struck by a foreign object.

[0007] To achieve the above objectives, the first aspect of this utility model provides a vehicle battery collision detection device, including a flexible pressure sensor, a pressure signal processing module, a control module, a communication module, and a power supply module;

[0008] The flexible pressure sensor is deployed globally or in an array at the bottom of the vehicle battery to capture changes in the impact pressure on the lower surface of the battery and convert the pressure changes into electrical signals.

[0009] The pressure signal processing module is connected to the flexible pressure sensor and is used to collect the electrical signal of the flexible pressure sensor and process it to convert it into a pressure signal.

[0010] The control module is connected to the pressure signal processing module and is used to receive the pressure signal and obtain the pressure distribution data of the flexible pressure sensor.

[0011] The communication module is connected to the control module and is used to transmit the pressure distribution data to the vehicle's infotainment system or a cloud server.

[0012] The power supply module is connected to the pressure signal processing module, the control module, and the communication module to provide power.

[0013] Based on the above, the flexible pressure sensor includes, from top to bottom, a top insulating layer, a top conductive layer, an elastic dielectric layer, a bottom conductive layer, and a bottom insulating layer;

[0014] The conductive materials of the top conductive layer and the bottom conductive layer are respectively arranged in a horizontal Row and a vertical Col spacing. The intersection of the top conductive layer and the bottom conductive layer constitutes a capacitive sensing point. When subjected to force, the elastic medium layer changes, causing the capacitance signal of the sensor matrix plane formed by the capacitive sensing points to change.

[0015] One end of the conductive material in the horizontal row of the top conductive layer serves as the first electrical signal output terminal.

[0016] One end of the vertical Col column conductive material of the bottom conductive layer serves as the second electrical signal output terminal;

[0017] In this system, the capacitive sensing points are physically insulated from each other.

[0018] Based on the above, the flexible pressure sensor further includes a top protective layer disposed above the top insulating layer and a bottom protective layer disposed below the bottom insulating layer.

[0019] Based on the above, the flexible pressure sensor also includes an adhesive layer disposed under the bottom protective layer, the adhesive layer being used to attach the flexible pressure sensor to the bottom of the vehicle battery.

[0020] Based on the above, the flexible pressure sensor is fixed to the bottom of the vehicle battery by rivets or screws.

[0021] Based on the above, the pressure signal processing module includes a capacitor acquisition circuit and a multi-channel analog electronic switch;

[0022] The first and second electrical signal output terminals of the flexible pressure sensor are respectively connected to the multi-channel analog electronic switch, and the multi-channel analog electronic switch is connected to the capacitance acquisition circuit.

[0023] The multi-channel analog electronic switch sequentially turns on the Row and Col columns of the flexible pressure sensor in a time-division manner, and collects the capacitance signals of each sensing point on the sensor matrix plane through the capacitance acquisition circuit, and converts them into pressure signals.

[0024] Based on the above, the control module is also connected to an LED indicator unit and an LCD display unit to display the operating status and pressure distribution data of the vehicle battery collision detection device.

[0025] Based on the above, the communication module is a LIN bus, and the control module transmits the pressure distribution data to the vehicle's infotainment system via LIN communication.

[0026] Based on the above, the communication module is a 4G or 5G communication module, and the control module transmits the pressure distribution data to the cloud server via 4G or 5G communication.

[0027] To achieve the above objectives, the second aspect of this utility model provides an electric vehicle equipped with a vehicle battery collision detection device for performing vehicle battery collision detection.

[0028] The beneficial effects of this utility model are as follows:

[0029] The vehicle battery collision detection device provided by this invention employs a flexible pressure sensor, either entirely or in an array, located at the bottom of the vehicle battery. This sensor can accurately sense and capture pressure changes on the lower surface of the battery. The flexible pressure sensor uses two conductive layers arranged in a horizontal row and vertical column spacing pattern. The intersection of the two conductive layers forms a capacitive sensing point. Combined with a pressure signal processing module consisting of a capacitive acquisition circuit and multiple analog electronic switches, it can accurately acquire pressure data.

[0030] The vehicle battery collision detection device provided by this utility model uses a flexible pressure sensor to convert the pressure of the battery being impacted into an electrical signal output. Based on this electrical signal, it can accurately determine whether the bottom of the vehicle battery has been impacted by a foreign object and locate the impact position. At the same time, it can also obtain all historical pressure distribution data after the impact, providing a data basis for subsequent assessment of the degree of damage to the vehicle battery and thus providing early warning of battery damage. Attached Figure Description

[0031] Figure 1 This is a circuit block diagram of the vehicle battery collision detection device in Example 1;

[0032] Figure 2 This is a schematic diagram showing the relative positions of the flexible pressure sensor, the vehicle, and the battery in Example 1.

[0033] Figure 3 This is a schematic diagram of the installation position of the flexible pressure sensor in Example 1;

[0034] Figure 4 This is a schematic diagram of the flexible pressure sensor in Example 1;

[0035] Figure 5 This is a schematic diagram of the circuit principle of the pressure signal processing module in Example 1;

[0036] Figure 6 This is a schematic diagram of the circuit principle of the communication module in Example 1.

[0037] In the diagram: 1. Battery; 2. Location of impact from external foreign object; 3. Flexible pressure sensor; 4. Vehicle chassis frame. Detailed Implementation

[0038] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0039] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application.

[0040] Example 1

[0041] This embodiment provides a vehicle battery collision detection device, such as... Figure 1 As shown, it includes a flexible pressure sensor, a pressure signal processing module, a control module, a communication module, and a power supply module;

[0042] The flexible pressure sensor is deployed globally or in an array at the bottom of the vehicle battery to capture changes in the impact pressure on the lower surface of the battery and convert the pressure changes into electrical signals.

[0043] The pressure signal processing module is connected to the flexible pressure sensor and is used to collect the electrical signal of the flexible pressure sensor and process it to convert it into a pressure signal.

[0044] The control module is connected to the pressure signal processing module and is used to receive the pressure signal and obtain the pressure distribution data of the flexible pressure sensor.

[0045] The communication module is connected to the control module and is used to transmit the pressure distribution data to the vehicle's infotainment system or a cloud server.

[0046] The power supply module is connected to the pressure signal processing module, the control module, and the communication module to provide power.

[0047] Flexible pressure sensor

[0048] Specifically, the flexible pressure sensor includes, from top to bottom, a top insulating layer, a top conductive layer, an elastic dielectric layer, a bottom conductive layer, and a bottom insulating layer;

[0049] like Figure 2-4 As shown, the conductive materials of the top conductive layer and the bottom conductive layer are respectively arranged in a horizontal Row and a vertical Col spacing. The intersection of the top conductive layer and the bottom conductive layer constitutes a capacitive sensing point. When subjected to force, the elastic medium layer changes, causing the capacitance signal of the sensor matrix plane composed of the capacitive sensing points to change.

[0050] One end of the conductive material in the horizontal row of the top conductive layer serves as the first electrical signal output terminal.

[0051] One end of the vertical Col column conductive material of the bottom conductive layer serves as the second electrical signal output terminal;

[0052] In this system, the capacitive sensing points are physically insulated from each other.

[0053] The flexible pressure sensor in this embodiment is used to sense pressure on the following principle:

[0054] The top and bottom conductive layers are arranged in a vertical Col column and a horizontal Row row spacing, respectively. An elastic dielectric layer lies between the two conductive layers. Capacitive sensing points are formed at the intersections of the top conductive layer, the elastic dielectric layer, and the bottom conductive layer, constituting a Col*Row array of capacitive sensors. The capacitance is calculated using the formula C=εS / 4πkd (where ε is the relative permittivity, S is the area of ​​the capacitor plates facing each other, d is the distance between the capacitor plates, and k is the electrostatic constant).

[0055] The flexible pressure sensor 3 is fixed to the bottom of the battery 1, and its relative position to the battery 1 is as follows: Figure 3 As shown. When the battery 1 and the vehicle chassis frame 4 are impacted by an external foreign object, they are deformed by force (such as at the impact position 2). The elastic medium layer in the flexible pressure sensor 3 changes, causing a change in the capacitance signal of the capacitive sensing point formed by the top conductive layer and the bottom conductive layer. This change in capacitance signal can be converted into a pressure signal through signal processing.

[0056] In some exemplary instances, for isolation and protection, the flexible pressure sensor may further include a top protective layer disposed above the top insulating layer and a bottom protective layer disposed below the bottom insulating layer.

[0057] In some exemplary instances, for ease of attachment, the flexible pressure sensor further includes an adhesive layer disposed beneath the bottom protective layer for attaching the flexible pressure sensor to the bottom of the vehicle battery.

[0058] In some exemplary instances, the row and column spacing can be at the millimeter level to comprehensively detect the pressure on the bottom surface of the battery.

[0059] In some exemplary embodiments, the dielectric layer can be any of silicone rubber, TPU, or TPE. The conductive layer can be composed of one or more of graphene slurry, graphite conductive adhesive, silver paste, or a mixture of carbon powder / carbon fiber / graphene and elastomer slurry. The insulating layer can be a composite material formed from a blend of cotton, polyester, nylon, and spandex with silicone, silicone rubber, TPU, or TPE. The specific materials and preparation processes used for the conductive and insulating layers are all existing technologies.

[0060] In some exemplary instances, the flexible pressure sensor is fixed to the bottom of the vehicle battery by rivets or screws.

[0061] Pressure signal processing module

[0062] The pressure signal processing module includes a capacitance acquisition circuit and a multi-channel analog electronic switch. The first and second electrical signal output terminals of the flexible pressure sensor are respectively connected to the multi-channel analog electronic switch, which is connected to the capacitance acquisition circuit. The multi-channel analog electronic switch sequentially turns on the Row and Col columns of the flexible pressure sensor in a time-division manner, and acquires the capacitance signals of each sensing point on the sensor matrix plane through the capacitance acquisition circuit, and converts them into pressure signals.

[0063] Figure 5 A circuit schematic of a pressure signal processing module is shown. Figure 5 In this circuit, capacitance acquisition circuit U6 is a PMDS-F4 ultra-low power capacitance measurement chip, which can acquire real-time capacitance signals from a flexible capacitive matrix sensor via IIC or SPI communication. U4 and U5 are multi-channel analog electronic switches. P1 is the Row signal input port for the flexible capacitive matrix sensor, and P2 is the Col signal input port. The multi-channel analog electronic switches conduct the rows and columns of the flexible capacitive matrix sensor in a time-division multiplexing manner, switching in a polling manner. The sampling refresh rate is 50Hz, and the fluctuation rate is 0.1pF. The capacitance signals of each sensing point on the sensor matrix plane are acquired through capacitance acquisition circuit U6, and can be converted into pressure signals through an internal preset algorithm. It should be noted that the preset algorithm here is a conventional technology in this field, utilizing the inherent application functions of the multi-channel analog electronic switches and capacitance acquisition circuit U6, and does not involve new computer programs.

[0064] Specifically, for example, the control IC selects MCU_COL1 and MCU_ROW1, and connects CAP_COL1 and CAP_ROW1 to the corresponding capacitor pins to detect the capacitance value of the corresponding capacitive sensing point and convert it into pressure data. After detecting one capacitive sensing point, the MCU switches pins—changing MCU_COL1 to MCU_COL2 while keeping MCU_ROW1 unchanged—and continues to select the next channel to detect a new capacitive sensing point. This process continues until all MCU_COLx channels have been switched, then switches to the next MCU_ROWx channel, and so on, until all capacitive sensing points have been detected.

[0065] Control module

[0066] The control module uses the STM32F103VET6 MCU core processor, which boasts excellent performance and can quickly output control signals to the electronic switch, enabling high-speed switching and ensuring a 50Hz refresh rate for the sensor pressure value. The processor employs a time-sharing RTOS operating system, making efficient use of resources to output pressure data to external devices during the time intervals between acquiring data from the flexible pressure sensor.

[0067] In some exemplary instances, the control module is also connected to an LED indicator unit and an LCD display unit for displaying the operating status and pressure distribution data of the vehicle battery collision detection device.

[0068] Communication module

[0069] In some exemplary instances, such as Figure 6 As shown, U1 is an STM32 main control chip that processes data transmitted via the LIN bus; U2 is an external storage chip W25Q128 that stores collision monitoring data during system operation; and U3 is a full-function LIN bus transceiver NCV7349. The communication module is a LIN bus, and the control module transmits the pressure distribution data to the vehicle's infotainment system via LIN communication.

[0070] In some exemplary instances, the communication module is a 4G or 5G communication module, and the control module transmits the pressure distribution data to the cloud server via 4G or 5G communication.

[0071] It should be noted that the power supply module can be a commonly used power supply module on the market.

[0072] Example 2

[0073] This embodiment provides an electric vehicle, in which the vehicle battery collision detection device described in Embodiment 1 is installed below the battery of the electric vehicle for vehicle battery collision detection.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A vehicle battery collision detection device, characterized in that: It includes a flexible pressure sensor, a pressure signal processing module, a control module, a communication module, and a power supply module; The flexible pressure sensor is deployed globally or in an array at the bottom of the vehicle battery to capture changes in the impact pressure on the lower surface of the battery and convert the pressure changes into electrical signals. The pressure signal processing module is connected to the flexible pressure sensor and is used to collect the electrical signal of the flexible pressure sensor and process it to convert it into a pressure signal. The control module is connected to the pressure signal processing module and is used to receive the pressure signal and obtain the pressure distribution data of the flexible pressure sensor. The communication module is connected to the control module and is used to transmit the pressure distribution data to the vehicle's infotainment system or a cloud server. The power supply module is connected to the pressure signal processing module, the control module, and the communication module to provide power.

2. The vehicle battery collision detection device according to claim 1, characterized in that: The flexible pressure sensor comprises, from top to bottom, a top insulating layer, a top conductive layer, an elastic dielectric layer, a bottom conductive layer, and a bottom insulating layer. The conductive materials of the top conductive layer and the bottom conductive layer are respectively arranged in a horizontal Row and a vertical Col spacing. The intersection of the top conductive layer and the bottom conductive layer constitutes a capacitive sensing point. When subjected to force, the elastic medium layer changes, causing the capacitance signal of the sensor matrix plane formed by the capacitive sensing points to change. One end of the conductive material in the horizontal row of the top conductive layer serves as the first electrical signal output terminal. One end of the vertical Col column conductive material of the bottom conductive layer serves as the second electrical signal output terminal; In this system, the capacitive sensing points are physically insulated from each other.

3. The vehicle battery collision detection device according to claim 2, characterized in that: The flexible pressure sensor also includes a top protective layer disposed above the top insulating layer and a bottom protective layer disposed below the bottom insulating layer.

4. The vehicle battery collision detection device according to claim 3, characterized in that: The flexible pressure sensor also includes an adhesive layer disposed beneath the bottom protective layer, the adhesive layer being used to attach the flexible pressure sensor to the bottom of the vehicle battery.

5. The vehicle battery collision detection device according to claim 3, characterized in that: The flexible pressure sensor is fixed to the bottom of the vehicle battery by rivets or screws.

6. The vehicle battery collision detection device according to any one of claims 2-5, characterized in that: The pressure signal processing module includes a capacitor acquisition circuit and a multi-channel analog electronic switch; The first and second electrical signal output terminals of the flexible pressure sensor are respectively connected to the multi-channel analog electronic switch, and the multi-channel analog electronic switch is connected to the capacitance acquisition circuit. The multi-channel analog electronic switch sequentially turns on the Row and Col columns of the flexible pressure sensor in a time-division manner, and collects the capacitance signals of each sensing point on the sensor matrix plane through the capacitance acquisition circuit, and converts them into pressure signals.

7. The vehicle battery collision detection device according to any one of claims 1-5, characterized in that: The control module is also connected to an LED indicator unit and an LCD display unit, which are used to display the operating status and pressure distribution data of the vehicle battery collision detection device.

8. The vehicle battery collision detection device according to any one of claims 1-5, characterized in that: The communication module is a LIN bus, and the control module transmits the pressure distribution data to the vehicle's infotainment system via LIN communication.

9. The vehicle battery collision detection device according to any one of claims 1-5, characterized in that: The communication module is a 4G or 5G communication module, and the control module transmits the pressure distribution data to the cloud server via 4G or 5G communication.

10. An electric vehicle, characterized in that: The device is equipped with a vehicle battery collision detection device as described in any one of claims 1-9, for performing vehicle battery collision detection.

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