Power battery pack waterproof vent valve detection device and detection method

Abstract

The present invention discloses a power battery pack waterproof and breathable valve detection device, comprising: a power battery pack, which is provided with a battery management system; a waterproof and breathable valve, which is provided on the power battery pack and communicated with the interior of the power battery pack; a first temperature and humidity sensor, which is provided on one side of the waterproof and breathable valve and located inside the power battery pack; a second temperature and humidity sensor, which is provided on one side of the waterproof and breathable valve and located outside the power battery pack; an embedded unit, which is respectively connected to the battery management system, the first temperature and humidity sensor and the second temperature and humidity sensor; a microcontroller, which is connected to the embedded unit; and an automobile electronic control system, which is connected to the microcontroller; the embedded unit obtains operating condition data of the power battery pack and temperature and humidity data on both sides of the waterproof and breathable valve, generates a calculation result and transmits it to the microcontroller, the microcontroller processes the calculation result to generate a processing result, determines whether the waterproof and breathable valve function fails, generates an analysis result and sends it to the automobile electronic control system to remind the driver.

Description

Technical Field

[0001] The present invention relates to the field of detection and measurement technology, and in particular to a detection device and a detection method for determining whether a waterproof and breathable valve function of a power battery pack is invalid. Background Art

[0002] In recent years, with the rapid development of the electric vehicle industry, the number and demand of new energy vehicles in China have increased year by year. At the same time, the safety issues of new energy vehicles have gradually been taken seriously, and the safety and reliability of power battery packs have also received more and more attention. As an essential component of the power battery pack, the waterproof and breathable valve plays an important role in the waterproof and dustproof and air pressure balance of the power battery pack. However, in actual use, the waterproof and breathable valve may fail to function, such as clogging, falling off, and rupture of the breathable membrane. Once these problems occur, the safety and reliability of the power battery pack will be greatly threatened, and even cause significant personal and property losses.

[0003] At present, the testing of the waterproof and breathable performance of the power battery pack is only carried out before leaving the factory. After leaving the factory, during the service process of the power battery pack, it is unknown whether the waterproof and breathable valve functions completely. There is no real-time detection device for the failure of the waterproof and breathable valve function of the power battery pack in the prior art, and the owner has no way of knowing whether the waterproof and breathable valve can work normally. Once the waterproof and breathable valve is blocked, falls off, or the breathable membrane ruptures during the actual operation of the electric vehicle, the safety and reliability of the power battery pack will be challenged, the normal service life of the power battery pack cannot be guaranteed, and it may even affect the safe operation of the electric vehicle. Summary of the invention

[0004] The purpose of the present invention is to overcome the defect that the failure of the waterproof and breathable valve function in the prior art cannot be detected, and to provide a power battery pack waterproof and breathable valve detection device for judging and warning the failure of the waterproof and breathable valve function, thereby improving the safety and reliability of the power battery pack.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A power battery pack waterproof and breathable valve detection device comprises: a power battery pack, wherein a battery management system is arranged in the power battery pack; a waterproof and breathable valve, wherein the waterproof and breathable valve is arranged on the power battery pack and communicated with the inside thereof; a first temperature and humidity sensor, which is arranged on one side of the waterproof and breathable valve and located inside the power battery pack; a second temperature and humidity sensor, which is arranged on one side of the waterproof and breathable valve and located outside the power battery pack; an embedded unit, which is respectively connected to the battery management system, the first temperature and humidity sensor and the second temperature and humidity sensor; a microcontroller, wherein the microcontroller is connected to the embedded unit; and an automobile electronic control system, wherein the automobile electronic control system is connected to the microcontroller; wherein the embedded unit is used to obtain operating condition data of the power battery pack and temperature and humidity data on both sides of the waterproof and breathable valve, and generate a calculation result and transmit it to the microcontroller; the microcontroller is used to process the calculation result to generate a processing result, judge whether the waterproof and breathable valve function fails based on the processing result, and generate an analysis result and send it to the automobile electronic control system; the automobile electronic control system is used to feed back the analysis result to the driver.

[0007] A method for detecting a waterproof and breathable valve of a power battery pack adopts the above-mentioned waterproof and breathable valve detection device of the power battery pack, and comprises the following steps: Step 1: The first temperature and humidity sensor and the second temperature and humidity sensor collect temperature and humidity data on both sides of the waterproof and breathable valve, and send them to the embedded unit. At the same time, the battery management system sends the operating condition data of the power battery pack to the embedded unit; Step 2: The embedded unit calculates the temperature and humidity data on both sides of the waterproof and breathable valve and the operating condition data of the power battery pack, and generates a calculation result and sends it to the microcontroller; Step 3: The microcontroller processes the calculation result, generates a processing result and compares it with a preset value, determines whether the waterproof and breathable valve function fails, generates an analysis result and sends it to the vehicle electronic control system; Step 4: The vehicle electronic control system feeds back the analysis result to the driver.

[0008] Preferably, the embedded unit has a built-in neural network, and the neural network uses a self-learning algorithm to implement unsupervised online training.

[0009] Preferably, the embedded unit generates the calculation result based on the pre-trained neural network calculation, and sends the calculation result to the microcontroller.

[0010] Preferably, the microcontroller processes the calculation result by a mean square error method and generates the processing result.

[0011] Preferably, when the processing result is greater than the preset value, the microcontroller determines that the waterproof breathable valve has failed.

[0012] Preferably, when the processing result is less than or equal to the preset value, the microcontroller determines that the waterproof breathable valve functions normally.

[0013] Preferably, when the microcontroller determines that the waterproof breathable valve fails to function, it generates an alarm message and transmits it to the automobile electronic control system, and the automobile electronic control system sends the alarm message to the driver.

[0014] Preferably, the embedded unit creates a model training component through a self-learning algorithm, collects the operating condition data of the power battery pack and the temperature and humidity data on both sides of the waterproof and breathable valve, and generates training data samples, and inputs the training data samples into the neural network based on the model training component for unsupervised online training, and generates the pre-trained neural network after the training is completed.

[0015] Preferably, after the embedded unit generates the pre-trained neural network, it downloads a weight file of the pre-trained neural network and writes the weight file into the embedded unit.

[0016] Compared with the prior art, the present invention collects the temperature and humidity data on both sides of the waterproof and breathable valve (i.e., inside and outside the power battery pack) in real time through the first temperature and humidity sensor and the second temperature and humidity sensor and sends it to the embedded unit. At the same time, the embedded unit obtains the operating condition data of the power battery pack through the battery management system. The embedded unit generates a calculation result through calculation and sends the calculation result to the microcontroller. The microcontroller processes the calculation result to generate a processing result, and compares the processing result with the preset value to determine whether the waterproof and breathable valve has a functional failure. If it is determined that a functional failure has occurred, an alarm message is sent to the vehicle electronic control system, and the vehicle electronic control system sends an alarm to the driver, reminding the driver in time to replace the waterproof and breathable valve that has failed to function, so as to avoid dangerous accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a power battery pack waterproof and breathable valve detection device of the present invention;

[0018] Figure 2 It is a partial structural schematic diagram of a power battery pack waterproof and breathable valve detection device of the present invention;

[0019] Figure 3 for Figure 2 A local enlarged schematic diagram of point A in the middle.

[0020] Description of Figure Numbers:

[0021] Label name Label name 1 Power battery pack 4 Second temperature and humidity sensor 11 Battery Management System 5 Embedded Unit 2 Waterproof breathable valve 6 Microcontroller 3 The first temperature and humidity sensor 7 Automotive electronic control system DETAILED DESCRIPTION

[0022] The power battery pack waterproof vent valve detection device and detection method of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] See also Figure 1 and Figure 2 The present invention discloses a power battery pack waterproof breathable valve detection device, which includes a power battery pack 1, a waterproof breathable valve 2, a first temperature and humidity sensor 3, a second temperature and humidity sensor 4, an embedded unit 5, a microcontroller 6 and an automotive electronic control system 7. A battery management system 11 is provided in the power battery pack 1, and the battery management system 11 can obtain operating condition data such as module temperature and cooling temperature of the power battery pack 1.

[0024] See also Figure 2 and Figure 3 , the waterproof and breathable valve 2 is arranged on the power battery pack 1, and the waterproof and breathable valve 2 is communicated with the inside of the power battery pack 1. The first temperature and humidity sensor 3 is arranged on one side of the waterproof and breathable valve 2, and the first temperature and humidity sensor 3 is located inside the power battery pack 1. The second temperature and humidity sensor 4 is arranged on one side of the waterproof and breathable valve 2, and the second temperature and humidity sensor 4 is located outside the power battery pack 1. The embedded unit 5 is connected to the battery management system 11, the first temperature and humidity sensor 3 and the second temperature and humidity sensor 4 respectively. The microcontroller 6 is connected to the embedded unit 5, and the automotive electronic control system 7 is connected to the microcontroller 6.

[0025] The embedded unit 5 is used to obtain the operating condition data of the power battery pack 1 and the temperature and humidity data on both sides of the waterproof and breathable valve 2, and generate a calculation result and transmit it to the microcontroller 6. The microcontroller 6 is used to process the calculation result to generate a processing result, compare the processing result with the preset value of the microcontroller 6, determine whether the function of the waterproof and breathable valve 2 fails, and generate an analysis result and send it to the automobile electronic control system 7. The automobile electronic control system 7 feeds back the analysis result of whether the function of the waterproof and breathable valve 2 fails to the driver.

[0026] The battery management system 11 sends the operating condition data of the power battery pack 1 to the embedded unit 5 through the integrated circuit bus. The first temperature and humidity sensor 3 and the second temperature and humidity sensor 4 are sensor components for detecting the temperature and humidity in the air. The first temperature and humidity sensor 3 and the second temperature and humidity sensor 4 are used to collect the temperature and humidity data on both sides of the waterproof and breathable valve 2 (i.e., inside and outside the power battery pack 1) in real time and send them to the embedded unit 5.

[0027] The internal temperature and humidity of the power battery pack 1 change during operation, and the external environment temperature and humidity change with the weather. When the waterproof breathable valve 2 is in a normal state or a detached, blocked, or other state, the heat and water vapor transmission through the waterproof breathable valve 2 will be different. Based on the differences in the heat and mass transfer characteristics of the waterproof breathable valve 2 in different states, it can be determined whether the waterproof breathable valve 2 provided on the power battery pack 1 has a functional failure.

[0028] The embedded unit 5 has a built-in neural network, and the neural network uses a self-learning algorithm to implement unsupervised online training. The embedded unit 5 generates calculation results based on the pre-trained neural network, and sends the calculation results to the microcontroller 6. The embedded unit 5 creates a model training component through a self-learning algorithm, collects the operating condition data of the power battery pack 1 and the temperature and humidity data on both sides of the waterproof and breathable valve 2, and generates training data samples. The training data samples are input into the neural network based on the model training component for unsupervised online training, and a pre-trained neural network is generated after the training is completed.

[0029] The neural network of the embedded unit 5 uses 16-bit (binary digit) fixed-point numbers, and the model training component uses a sparse matrix compression algorithm for parallel computing to implement the deployment of a two-layer 64-point LSTM (Long Short-Term Memory) network. After the embedded unit 5 generates the pre-trained neural network, the embedded unit 5 downloads the weight file of the pre-trained neural network and writes the weight file into the embedded unit 5.

[0030] The detection method using the power battery pack waterproof breathable valve detection device comprises the following steps:

[0031] First, the first temperature and humidity sensor 3 and the second temperature and humidity sensor 4 collect temperature and humidity data on both sides of the waterproof and breathable valve 2 (i.e., inside and outside the power battery pack 1), and transmit them to the embedded unit 5. At the same time, the embedded unit 5 obtains the operating condition data of the power battery pack 1 provided by the battery management system 11 through the integrated circuit bus.

[0032] Secondly, the embedded unit 5 calculates the temperature and humidity data on both sides of the waterproof and breathable valve 2 and the operating condition data of the power battery pack 1 to generate a calculation result, and sends the calculation result to the microcontroller 6.

[0033] Then, after receiving the calculation result, the microcontroller 6 uses the calculation result as a parameter of the mean square error algorithm, performs a second calculation to obtain the processing result, and compares the processing result with the preset value set in the microcontroller 6 to determine whether the waterproof breathable valve 2 has a functional failure.

[0034] When the processing result is greater than the preset value of the microcontroller 6, the microcontroller 6 determines that the waterproof breathable valve 2 is functionally invalid; when the processing result is less than or equal to the preset value of the microcontroller 6, the microcontroller 6 determines that the waterproof breathable valve 2 is functionally normal.

[0035] When the microcontroller 6 determines that the waterproof breathable valve 2 has a malfunction, an alarm message is generated and transmitted to the automobile electronic control system 7. When the microcontroller 6 determines that the waterproof breathable valve 2 functions normally, the alarm message will not be generated, and a normal signal will be transmitted to the automobile electronic control system 7. The microcontroller 6 generates an analysis result based on the above judgment and sends it to the automobile electronic control system 7. The analysis result may be an abnormal signal that generates the alarm message, or a normal signal that does not generate an alarm message.

[0036] Finally, the automobile electronic control system 7 sends the analysis result to the driver. If the analysis result is the alarm information, it reminds the driver that the waterproof breathable valve 2 has failed and the failed waterproof breathable valve 2 needs to be replaced in time to avoid dangerous accidents.

[0037] The present invention collects the temperature and humidity data on both sides of the waterproof and breathable valve 2 (inside and outside the power battery pack 1) in real time through the first temperature and humidity sensor 3 and the second temperature and humidity sensor 4 and sends it to the embedded unit 5. At the same time, the embedded unit 5 obtains the operating condition information of the power battery pack 1 through the battery management system 11. The embedded unit 5 generates a calculation result through calculation and sends the calculation result to the microcontroller 6. The microcontroller 6 processes the calculation result to generate a processing result, and compares the processing result with the preset value to determine whether the waterproof and breathable valve 2 has a functional failure. If it is determined that a functional failure has occurred, an alarm message is sent to the automobile electronic control system 7, and the automobile electronic control system 7 sends an alarm to the driver, reminding the driver in time to replace the waterproof and breathable valve 2 that has failed to function, so as to avoid dangerous accidents.

[0038] The above description is a detailed description of the preferred feasible embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modified changes completed under the technical spirit disclosed by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A power battery pack waterproof vent detection device, characterized in that: include: A power battery pack, wherein the power battery pack is provided with a battery management system; A waterproof and breathable valve, which is arranged on the power battery pack and communicates with the interior of the power battery pack; A first temperature and humidity sensor, which is arranged on one side of the waterproof and breathable valve and located inside the power battery pack; A second temperature and humidity sensor, which is arranged on one side of the waterproof and breathable valve and located outside the power battery pack; An embedded unit, which is respectively connected to the battery management system, the first temperature and humidity sensor, and the second temperature and humidity sensor; a microcontroller connected to the embedded unit; An automobile electronic control system, the automobile electronic control system being connected to the microcontroller; Among them, the embedded unit is used to obtain the operating condition data of the power battery pack and the temperature and humidity data on both sides of the waterproof and breathable valve, and generate a calculation result and transmit it to the microcontroller. The microcontroller is used to process the calculation result to generate a processing result, and judge whether the function of the waterproof and breathable valve fails based on the processing result, and generate an analysis result and send it to the vehicle electronic control system. The vehicle electronic control system is used to feed back the analysis result to the driver.

2. A method for detecting a waterproof vent valve of a power battery pack, characterized in that: The power battery pack waterproof vent detection device according to claim 1 comprises the following steps: Step 1: The first temperature and humidity sensor and the second temperature and humidity sensor collect temperature and humidity data on both sides of the waterproof breathable valve and send them to the embedded unit. At the same time, the battery management system sends the operating condition data of the power battery pack to the embedded unit; Step 2: The embedded unit calculates the temperature and humidity data on both sides of the waterproof and breathable valve and the operating condition data of the power battery pack, and generates a calculation result and sends it to the microcontroller; Step 3: The microcontroller processes the calculation result, generates a processing result and compares it with a preset value, determines whether the waterproof breathable valve function fails, generates an analysis result and sends it to the automobile electronic control system; Step 4: The automobile electronic control system feeds back the analysis result to the driver.

3. The method for detecting a waterproof vent valve of a power battery pack as claimed in claim 2, characterized in that: The embedded unit has a built-in neural network, and the neural network uses a self-learning algorithm to implement unsupervised online training.

4. The method for detecting a waterproof vent valve of a power battery pack as claimed in claim 3, characterized in that: The embedded unit generates the calculation result based on the pre-trained neural network calculation and sends the calculation result to the microcontroller.

5. The method for detecting a waterproof vent valve of a power battery pack as claimed in claim 4, characterized in that: The microcontroller processes the calculation result by a mean square error method and generates the processing result.

6. The method for detecting a waterproof vent valve of a power battery pack as claimed in claim 5, characterized in that: When the processing result is greater than the preset value, the microcontroller determines that the waterproof breathable valve has failed.

7. The method for detecting a waterproof vent valve of a power battery pack as claimed in claim 6, characterized in that: When the processing result is less than or equal to the preset value, the microcontroller determines that the waterproof breathable valve functions normally.

8. The method for detecting a waterproof vent valve of a power battery pack according to claim 5, characterized in that: When the microcontroller determines that the waterproof breathable valve has a functional failure, it generates an alarm message and transmits it to the automobile electronic control system, and the automobile electronic control system sends the alarm message to the driver.

9. The method for detecting a waterproof vent valve of a power battery pack according to claim 8, characterized in that: The embedded unit creates a model training component through a self-learning algorithm, collects the operating condition data of the power battery pack and the temperature and humidity data on both sides of the waterproof and breathable valve, and generates training data samples. The training data samples are input into the neural network based on the model training component for unsupervised online training. After the training is completed, the pre-trained neural network is generated.

10. The method for detecting a waterproof vent valve of a power battery pack according to claim 9, characterized in that: After the embedded unit generates the pre-trained neural network, it downloads the weight file of the pre-trained neural network and writes the weight file into the embedded unit.

Images