Novel power battery system bottom collision detection device

Abstract

The utility model relates to the technical field of battery detection, and discloses a novel power battery system bottom collision detection device, which comprises an optical fiber, an optical signal transmitter, an optical signal receiver, a BMS (Battery Management System) and a control unit, the optical fiber is laid on a bottom tray of the battery system; the optical signal transmitter is connected with one end of the optical fiber and is used for transmitting an optical signal into the optical fiber; the optical signal receiver is connected with the other end of the optical fiber and is used for receiving an optical signal transmitted by the optical fiber; the control unit is electrically connected with the optical signal transmitter and the optical signal receiver; and the BMS is used for monitoring and managing the running state of the battery system. The battery pack bottom deformation or damage detection is realized through low-cost optical fiber arrangement, the battery pack bottom deformation or damage detection device can be compatible with battery packs or systems of various sizes and shapes, the operation is simple and reliable, the practicability is high, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection, and in particular to a novel bottom collision detection device for a power battery system. Background Art

[0002] With the rapid development of the new energy vehicle industry, vehicle safety issues have become increasingly prominent, especially the safety hazards related to power batteries. New energy vehicle fires caused by battery problems frequently occur in the market. These accidents not only pose a threat to consumer safety, but also have a negative impact on the development of the entire industry. Statistics show that the power battery system ignites due to bumps on the bottom, which accounts for a high proportion of all accidents.

[0003] The damage caused by a bottom collision is often not easy to detect, which makes it difficult for the driver to judge whether the bottom of the vehicle has been hit and the severity of the damage. If a serious bottom collision is not repaired in time, long-term "disease-infected" operation may accumulate risks, leading to serious consequences.

[0004] At present, the deformation of power batteries is usually detected by strain gauges. However, this detection method has certain limitations: first, the detection circuit is easily affected by the electromagnetic interference generated by the power battery, which may lead to inaccurate detection results; second, the detection circuit itself is relatively complex, which is not conducive to implementation and use. Therefore, a more reliable and simple technology is urgently needed to detect and evaluate the impact of bottom impact on the power battery system. Utility Model Content

[0005] The novel bottom collision detection device for a power battery system provided by the utility model realizes deformation or damage detection of the bottom of the battery pack by arranging low-cost optical fibers, is compatible with battery packs or systems of various sizes and shapes, and has the characteristics of simple operation, strong practicality, strong anti-interference ability, high stability and low maintenance cost.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a new bottom collision detection device for a power battery system, comprising an optical fiber, a laser signal transmitter, a laser signal receiver, a BMS and a control unit; the optical fiber is laid on the bottom tray of the battery system; the laser signal transmitter is connected to one end of the optical fiber, and is used to transmit a laser signal to the optical fiber; the laser signal receiver is connected to the other end of the optical fiber, and is used to receive the laser signal transmitted by the optical fiber; the control unit is electrically connected to the laser signal transmitter and the laser signal receiver; the BMS is used to monitor and manage the operating status of the battery system.

[0007] The beneficial effects of the utility model are as follows: by laying optical fiber on the bottom tray of the new energy vehicle power battery system and using a laser signal transmitter and receiver in conjunction with a control unit to achieve real-time monitoring of bottom collisions, the detection accuracy and response speed of damaged battery systems can be improved, and the safety hazards caused by bottom collisions can be reduced. At the same time, since the optical fiber is not susceptible to electromagnetic interference, the reliability of the detection system is improved, and it is helpful to take maintenance or protective measures in a timely manner through data analysis by the control unit, thereby improving safety performance.

[0008] Furthermore, the optical fibers are arranged in an S-shape to cover the entire bottom of the battery system.

[0009] The beneficial effect of this solution is that by arranging the optical fiber in an S-shaped manner to cover the entire bottom of the power battery system, this solution improves the coverage and sensitivity of the detection device. No matter where the impact occurs in the battery system, the collision or pressure change at the bottom can be detected more comprehensively and accurately, ensuring that even slight deformation at the edge or corner of the chassis can be detected, thereby enhancing the safety monitoring capability of the power battery when subjected to external impact.

[0010] Furthermore, the control unit includes a deformation detection module and an alarm module; the deformation detection module is used to compare the intensity of the emitted laser signal with the received laser signal to determine the degree of deformation; the alarm module triggers an alarm when the deformation detection module detects that the laser signal intensity is weakened to a preset threshold.

[0011] The beneficial effect of this solution is that the deformation detection module determines the deformation degree of the bottom of the battery system by comparing the changes in the laser signal. When it is detected that the deformation reaches the preset danger threshold, the alarm module is immediately triggered and an alarm is sounded, which not only improves the real-time monitoring capability of the vehicle during driving, but also helps maintenance personnel quickly locate the damaged parts, carry out repairs or replacements in time, and avoid further damage caused by collision.

[0012] Furthermore, the laser signal receiver includes a light intensity sensor for detecting the intensity of the laser signal transmitted to the laser signal receiver end through the optical fiber.

[0013] The beneficial effect of this solution is that the light intensity sensor can accurately measure the intensity of the laser signal transmitted to the receiving end through the optical fiber, so that the system can respond promptly when changes in the laser signal intensity are detected, thereby achieving high-sensitivity monitoring of tiny deformations at the bottom of the battery system.

[0014] Furthermore, the optical fiber is a multimode optical fiber or a single-mode optical fiber.

[0015] The beneficial effect of this solution is that the most suitable optical fiber type can be selected according to specific application requirements, making the application of the bottom collision detection device of the new power battery system more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the principle of the bottom collision detection device of the new power battery system in the utility model;

[0017] Figure 2 It is a schematic diagram of the deformation of the optical fiber of the bottom collision detection device of the new power battery system in the utility model when it is hit by an obstacle;

[0018] Figure 3 It is a schematic diagram of the refraction and dissipation of light caused by the bending of the optical fiber of the bottom collision detection device of the new power battery system in the utility model. DETAILED DESCRIPTION

[0019] The reference numerals in the drawings of the specification include: optical fiber 1, battery pack or system bottom tray 2, laser signal transmitter / receiver 3, BMS 4.

[0020] Embodiment 1

[0021] This embodiment provides a bottom collision detection device for a power battery system, which detects bottom collision events by laying optical fibers on a battery pack or a bottom tray 2 of the system. Figure 1 As shown in the schematic diagram of the principle architecture of the bottom collision detection device of the new power battery system, it includes an optical fiber 1, a laser signal transmitter / receiver 3, a BMS 4 and a control unit.

[0022] Optical fiber 1 is a medium that conducts light using the principle of total internal reflection. In the absence of external forces, light propagates along the axis of the optical fiber with very little loss, so the laser signal can be transmitted over a long distance without losing its intensity. However, when optical fiber 1 is deformed, such as bent or stretched, some light may not meet the conditions for total internal reflection and escape from the optical fiber, resulting in a decrease in the intensity of the laser signal that reaches the other end through optical fiber 1. The greater the degree of bending of optical fiber 1, the more light is lost, and the weaker the intensity of the received laser signal.

[0023] Optical fiber 1 is generally a multimode optical fiber or a single-mode optical fiber. In this embodiment, optical fiber 1 is a single-mode optical fiber with high transmission efficiency and low laser signal attenuation characteristics. One end of the single-mode optical fiber is connected to a laser signal transmitter, which is responsible for generating a stable laser signal and inputting it into optical fiber 1. The other end of optical fiber 1 is connected to a laser signal receiver, which is also provided with a highly sensitive light intensity sensor for detecting the intensity of the laser signal transmitted from optical fiber 1.

[0024] In this embodiment, the optical fiber 1 adopts an S-shaped layout to ensure that the entire bottom of the battery system is covered to provide comprehensive collision detection.

[0025] The control unit is electrically connected to the laser signal transmitter and the laser signal receiver 3. The control unit includes a deformation detection module, which is used to compare the intensity of the emitted laser signal with the received laser signal to determine the degree of deformation. Figure 2 As shown in Figure 2), the optical fiber 1 will bend, causing the laser signal passing through the optical fiber 1 to be refracted and dissipated (as shown in Figure 2). Figure 3 ), thereby causing the signal strength to change.

[0026] If the received laser signal intensity is zero, the control unit determines that a serious collision has occurred at the bottom of the battery system, indicating that optical fiber 1 may have been broken. If the received laser signal intensity is significantly weaker than the transmitted signal, the control unit identifies this as a significant deformation of the bottom of the battery system. Finally, if the received laser signal intensity does not change significantly or is the same as the transmitted signal intensity, the control unit will determine that no bottom collision has occurred, or that it is only a slight bump, which will not affect the normal use of the battery system.

[0027] Embodiment 2

[0028] The difference between this embodiment and the first embodiment is that the control unit in this embodiment further includes an alarm module, which triggers an alarm when the deformation detection module detects that the laser signal intensity is weakened to a preset threshold, and outputs the collision detection result through the BMS 4.

[0029] When the vehicle is powered on, the laser signal transmitter starts to emit laser signals into the optical fiber 1, and the laser signals propagate through the optical fiber 1 to the laser signal receiver. Under normal circumstances, the laser signal in the optical fiber 1 remains stable. Figure 2 As shown), the optical fiber 1 will bend, resulting in refraction and dissipation of light (as shown in Figure 3 As shown), the intensity of the laser signal received by the receiver is changed.

[0030] When the deformation detection module detects that the laser signal intensity is weakened to a preset threshold, an alarm is triggered, including but not limited to sounding or visual alarms, such as displaying a warning message on the vehicle dashboard, or notifying the driver and the remote server through the vehicle communication system.

[0031] If the received laser signal intensity is zero, the control unit determines that a severe collision has occurred at the bottom of the battery system, indicating that the optical fiber 1 may have been broken. In this case, the control unit will trigger an alarm to remind you to take necessary safety measures, such as disconnecting the battery power supply, to avoid further damage.

[0032] If the intensity of the received laser signal is significantly weaker than that of the transmitted signal, the control unit will identify this as a significant deformation of the bottom of the battery system. The deformation may be caused by an external impact that changes the curvature of the optical fiber 1, causing light loss during propagation. At this time, the control unit will trigger an alarm to notify the driver to check or recommend further maintenance work.

[0033] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A new type of bottom collision detection device for power battery system, characterized in that: It includes an optical fiber, a laser signal transmitter, a laser signal receiver, a BMS and a control unit; the optical fiber is laid on the bottom tray of the battery system; the laser signal transmitter is connected to one end of the optical fiber and is used to transmit a laser signal to the optical fiber; the laser signal receiver is connected to the other end of the optical fiber and is used to receive the laser signal transmitted by the optical fiber; the control unit is electrically connected to the laser signal transmitter and the laser signal receiver; the BMS is used to monitor and manage the operating status of the battery system.

2. The novel bottom collision detection device of the power battery system according to claim 1 is characterized in that: The optical fibers are arranged in an S-shape to cover the entire bottom of the battery system.

3. The novel bottom collision detection device of the power battery system according to claim 2 is characterized in that: The control unit includes a deformation detection module and an alarm module; the deformation detection module is used to compare the intensity of the emitted laser signal with the received laser signal to determine the degree of deformation; the alarm module triggers an alarm when the deformation detection module detects that the intensity of the laser signal is weakened to a preset threshold.

4. The novel power battery system bottom collision detection device according to claim 3 is characterized in that: The laser signal receiver includes a light intensity sensor for detecting the intensity of the laser signal transmitted to the laser signal receiver end through the optical fiber.

5. The novel power battery system bottom collision detection device according to claim 1 is characterized in that: The optical fiber is a multimode optical fiber or a single-mode optical fiber.

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