Truck lithium battery attitude calibration and measurement method

Abstract

The invention relates to a truck lithium battery attitude calibration and measurement method, which comprises truck lithium battery attitude calibration and truck lithium battery attitude measurement, and the truck lithium battery attitude calibration comprises the following steps: S1, after a calibration offline instruction is received, setting an attitude calibration flag bit as 0; s2, when the lithium battery is in a static state, identifying that one of X +, X-, Y +, Y-, Z + and Z-of the triaxial chip points to the earth center, and recording to the NVM after identification, personnel do not need to check on site, physical restrictions such as sight blocking are overcome, and when the lithium battery is in an abnormal state such as inversion or encounters strong collision, the lithium battery can be accurately identified. The system can quickly detect and inform related personnel of timely disposal for the first time through 4G or Bluetooth and other communication technologies, battery damage and safety risks are reduced to the maximum extent, a manufacturer can monitor the whole process of storage, transportation, use and the like through attitude angle and collision acceleration data recorded by a server, and the safety of the battery is improved. And the method can also be used as a basis for safety evaluation and after-sales analysis.

Description

Technical Field

[0001] The invention relates to the field of truck lithium batteries, and in particular to a truck lithium battery posture calibration and measurement method. Background Art

[0002] The existing batteries used in trucks work in harsh environments and are often exposed to extreme conditions such as high temperature, high vibration, and large starting current. Lithium iron phosphate batteries, which have high safety characteristics and larger capacity, are very suitable for trucks' needs for batteries. At the same time, due to the presence of electrolyte, lithium iron phosphate batteries may be damaged or even dangerous when the battery is in an abnormal posture such as inverted. Moreover, lithium iron phosphate batteries are sensitive to collisions. Strong collisions may cause accidents such as battery loss of control and thermal runaway.

[0003] The existing 12V\24V truck starting and energy storage lithium batteries on the market basically have no posture and collision monitoring functions, and only rely on the prompts on the outer packaging or instructions to warn merchants or users. There is also a lack of equipment to monitor the longitudinal, lateral and vertical acceleration of trucks.

[0004] Therefore, we propose a truck lithium battery posture calibration and measurement method to monitor the posture and collision of the truck lithium iron phosphate battery. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art, adapt to actual needs, and provide a truck lithium battery posture calibration and measurement method to solve the current problem that merchants or users can only obtain the posture and collision information of the lithium battery through sensory methods such as visual viewing, and there are physical limitations such as line of sight obstruction. When the lithium battery is in an abnormal posture such as inverted or a collision with a large force, the merchant or user cannot receive real-time reminders. There are risk factors such as battery damage and continuous overheating. There is no truck longitudinal, lateral, and vertical acceleration data. There is a lack of data support for big data analysis of truck drivers' driving behavior habits, fuel-saving driving strategy formulation, etc. Technical problems.

[0006] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is: designing a truck lithium battery posture calibration and measurement method, including truck lithium battery posture calibration and truck lithium battery posture measurement, the truck lithium battery posture calibration includes the following steps:

[0007] S1. After receiving the offline calibration command, set the attitude calibration flag to 0;

[0008] S2. When the lithium battery is in a stationary state, identify that one of the three-axis chip's X+, X-, Y+, Y-, Z+, and Z- directions points to the center of the earth, and record it in NVM after identification;

[0009] S3, set the three-axis offset values ​​of the three-axis chip to 0 and write them into the three-axis chip;

[0010] S4, recording the acceleration values ​​of the X, Y, and Z axes at this time into the NVM as the offset values ​​of the attitude angle;

[0011] S5, writing the collision acceleration threshold into the three-axis chip;

[0012] S6. After setting the posture calibration mark position 1 and the collision acceleration threshold configuration mark position 1, record them in NVM.

[0013] Preferably, the truck lithium battery posture measurement comprises the following steps:

[0014] S1. First, set the attitude calibration standard bit to 1, and then confirm whether the acquired three-axis raw data is within the normal range;

[0015] S2. When the acquired three-axis raw data is within the normal range, the calibration offset is subtracted from the three-axis raw measurement data to calculate the current acceleration value. The current pitch angle, roll angle, and yaw angle are calculated based on the current acceleration value. The angle between the current attitude angle and the center of the earth is calculated based on the recorded chip calibration orientation.

[0016] S3. When the calculated acceleration value is greater than the collision threshold, the "battery collision fault" is set to 1, and the "battery collision fault" is reported to the server and the mobile phone;

[0017] S4. When the calculated acceleration value is not greater than the collision threshold, determine whether the angle between the current attitude angle and the center of the earth is greater than 45°;

[0018] S5. When the angle is greater than 45°, determine whether the state is maintained for more than 120 seconds. If it is determined to be greater than 120 seconds, set the "battery tilt fault" to 1 and report the "battery tilt fault" to the server and the mobile phone.

[0019] Preferably, the lithium battery BMS in the truck lithium battery posture calibration includes a three-axis acceleration sensor circuit.

[0020] Preferably, in the truck lithium battery posture calibration, the lithium battery BMS obtains original acceleration data of the X, Y and Z axes from a three-axis acceleration sensor.

[0021] Preferably, in the truck lithium battery posture calibration, the current lithium battery posture angle and overall acceleration data are calculated from the original acceleration data of the X, Y and Z axes.

[0022] Preferably, in the truck lithium battery posture calibration, when the lithium battery is finished and tested off-line, the posture calibration is performed using the current posture as the initial 0 angle.

[0023] Preferably, in the truck lithium battery attitude calibration, after the attitude calibration is completed, the calibration data is stored in the NVM as a basis for subsequent attitude angle calculation.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention does not require on-site inspection by personnel, thus overcoming physical limitations such as line of sight obstruction.

[0026] 2. When the lithium battery is in an abnormal state such as inverted or encounters a strong collision, the present invention can quickly detect it and notify relevant personnel in the first time through communication technologies such as 4G or Bluetooth to deal with it in time, thereby minimizing battery damage and safety risks.

[0027] 3. The manufacturer of the present invention can monitor the entire process of storage, transportation, use, etc. through the posture angle and collision acceleration data recorded by the server, and can also use it as a basis for safety assessment and after-sales analysis.

[0028] 4. The present invention can analyze the driver's driving habits through cloud service big data according to the specific acceleration data of the vehicle, and formulate targeted driving strategies for saving fuel, reducing losses and improving safety, thereby achieving better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the truck lithium battery posture calibration process of the present invention;

[0030] Figure 2 A schematic diagram of the truck lithium battery posture measurement process of the present invention;

[0031] Figure 3 It is a schematic diagram of the longitudinal, lateral and vertical acceleration collection and reporting process of the present invention;

[0032] Figure 4 This is an example diagram of the longitudinal, lateral and vertical acceleration statistical data analysis of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0034] A truck lithium battery posture calibration and measurement method, see Figures 1 to 4 , including truck lithium battery attitude calibration and truck lithium battery attitude measurement, truck lithium battery attitude calibration includes the following steps:

[0035] S1. After receiving the offline calibration command, set the attitude calibration flag to 0;

[0036] S2. When the lithium battery is in a stationary state, identify that one of the three-axis chip's X+, X-, Y+, Y-, Z+, and Z- directions points to the center of the earth, and record it in NVM after identification;

[0037] S3, set the three-axis offset values ​​of the three-axis chip to 0 and write them into the three-axis chip;

[0038] S4, recording the acceleration values ​​of the X, Y, and Z axes at this time into the NVM as the offset values ​​of the attitude angle;

[0039] S5, writing the collision acceleration threshold into the three-axis chip;

[0040] S6. After setting the posture calibration mark position 1 and the collision acceleration threshold configuration mark position 1, record them in NVM.

[0041] For details, see Figure 2 ,The truck lithium battery posture measurement includes the following steps:

[0042] S1. First, set the attitude calibration standard bit to 1, and then confirm whether the acquired three-axis raw data is within the normal range;

[0043] S2. When the acquired three-axis raw data is within the normal range, the calibration offset is subtracted from the three-axis raw measurement data to calculate the current acceleration value. The current pitch angle, roll angle, and yaw angle are calculated based on the current acceleration value. The angle between the current attitude angle and the center of the earth is calculated based on the recorded chip calibration orientation.

[0044] S3. When the calculated acceleration value is greater than the collision threshold, the "battery collision fault" is set to 1, and the "battery collision fault" is reported to the server and the mobile phone;

[0045] S4. When the calculated acceleration value is not greater than the collision threshold, determine whether the angle between the current attitude angle and the center of the earth is greater than 45°;

[0046] S5. When the angle is greater than 45°, determine whether the state is maintained for more than 120 seconds. If it is determined to be greater than 120 seconds, set the "battery tilt fault" to 1 and report the "battery tilt fault" to the server and the mobile phone.

[0047] For further information, see Figure 1 ,The lithium battery BMS in the truck lithium battery attitude calibration includes a three-axis acceleration sensor circuit.

[0048] It is worth noting that see Figure 1 In the truck lithium battery attitude calibration, the lithium battery BMS obtains the original acceleration data of the X, Y, and Z axes from the three-axis acceleration sensor.

[0049] It is worth noting that see Figure 1 In the truck lithium battery attitude calibration, the current lithium battery attitude angle and overall acceleration data are calculated from the original acceleration data of the X, Y, and Z axes.

[0050] It is worth mentioning that see Figure 1 In the truck lithium battery posture calibration, when the lithium battery is finished and tested off the line, the current posture is used as the initial 0 angle for posture calibration.

[0051] It is worth emphasizing that see Figure 1 ,During the truck lithium battery attitude calibration, after the attitude calibration is completed, the calibration data will be stored in NVM as the basis for subsequent attitude angle calculation.

[0052] Embodiment 1

[0053] See also Figure 3 , the longitudinal, lateral and vertical acceleration collection and reporting are as follows:

[0054] S1, first count whether the two minutes have been reached;

[0055] S1. When it is confirmed that the two-minute time has arrived, the current X (longitudinal), Y (horizontal), and Z (vertical) acceleration values ​​are uploaded to the cloud server.

[0056] Example diagram of longitudinal, lateral and vertical acceleration statistical data analysis:

[0057] ① Blue represents longitudinal acceleration, which is related to the acceleration and deceleration rate of the car; ② Green represents lateral acceleration, which is related to the centrifugal force of car steering; ③ Yellow represents vertical acceleration, which is related to the bump intensity of the car; ④ Black represents the vector sum of longitudinal, lateral and vertical accelerations, representing the overall acceleration of the car; ⑤ Red represents the speed of the car;

[0058] from Figure 4 It can be seen that the overall acceleration of the car is strongly correlated with the vehicle speed.

[0059] By comparing multiple such tables, we can analyze each driver's driving habits, such as sudden acceleration, sudden deceleration, sharp turns, and other operations that increase vehicle fuel consumption and loss, and propose targeted improvement measures.

[0060] In addition, the components designed in the present invention are all universal standard parts or components known to technical personnel in this field. Their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods. They can be fully implemented by technical personnel in this field. Needless to say, the content protected by the present invention does not involve improvements to internal structures and methods.

[0061] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A truck lithium battery attitude calibration and measurement method, including truck lithium battery attitude calibration and truck lithium battery attitude measurement, characterized in that: The truck lithium battery posture calibration comprises the following steps: S1. After receiving the offline calibration command, set the attitude calibration flag to 0; S2. When the lithium battery is in a stationary state, identify that one of the three-axis chip's X+, X-, Y+, Y-, Z+, and Z- directions points to the center of the earth, and record it in NVM after identification; S3, set the three-axis offset values ​​of the three-axis chip to 0 and write them into the three-axis chip; S4, recording the acceleration values ​​of the X, Y, and Z axes at this time into the NVM as the offset values ​​of the attitude angle; S5, writing the collision acceleration threshold into the three-axis chip; S6. After setting the posture calibration mark position 1 and the collision acceleration threshold configuration mark position 1, record them in NVM.

2. The truck lithium battery posture calibration and measurement method as claimed in claim 1, characterized in that: The truck lithium battery posture measurement comprises the following steps: S1. First, set the attitude calibration standard bit to 1, and then confirm whether the acquired three-axis raw data is within the normal range; S2. When the acquired three-axis raw data is within the normal range, the calibration offset is subtracted from the three-axis raw measurement data to calculate the current acceleration value. The current pitch angle, roll angle, and yaw angle are calculated based on the current acceleration value. The angle between the current attitude angle and the center of the earth is calculated based on the recorded chip calibration orientation. S3. When the calculated acceleration value is greater than the collision threshold, the "battery collision fault" is set to 1, and the "battery collision fault" is reported to the server and the mobile phone; S4. When the calculated acceleration value is not greater than the collision threshold, determine whether the angle between the current attitude angle and the center of the earth is greater than 45°; S5. When the angle is greater than 45°, determine whether the state is maintained for more than 120 seconds. If it is determined to be greater than 120 seconds, set the "battery tilt fault" to 1 and report the "battery tilt fault" to the server and the mobile phone.

3. The truck lithium battery posture calibration and measurement method as claimed in claim 1, characterized in that: The lithium battery BMS in the truck lithium battery posture calibration includes a three-axis acceleration sensor circuit.

4. The truck lithium battery posture calibration and measurement method as claimed in claim 1, characterized in that: In the truck lithium battery posture calibration, the lithium battery BMS obtains the original acceleration data of the X, Y, and Z axes from the three-axis acceleration sensor.

5. The truck lithium battery posture calibration and measurement method as claimed in claim 1, characterized in that: In the truck lithium battery posture calibration, the current lithium battery posture angle and overall acceleration data are calculated from the original acceleration data of the X, Y, and Z axes.

6. The truck lithium battery posture calibration and measurement method as claimed in claim 1, characterized in that: In the truck lithium battery posture calibration, when the lithium battery is finished and tested off the line, the posture calibration is performed using the current posture as the initial 0 angle.

7. The truck lithium battery posture calibration and measurement method as claimed in claim 1, characterized in that: In the truck lithium battery attitude calibration, after the attitude calibration is completed, the calibration data is stored in the NVM as a basis for subsequent attitude angle calculation.

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