Wiring method of power battery temperature collector

Abstract

The application discloses a wiring method of a power battery temperature collector, which comprises the following steps: firstly, determining the size of a collecting circuit board and the number of thermistors; then, performing preliminary wiring design and manufacturing the collecting circuit board according to the preliminary wiring design; then, measuring the resistance values of each collecting line of the manufactured collecting circuit board and readjusting the wiring design according to the measurement results; then, repeatedly performing the manufacturing of the collecting circuit board, the measurement of the resistance values of the collecting lines and the readjustment of the wiring design until the final wiring design is obtained, in which the deviation of the resistance values of each collecting line of the collecting circuit board from the average value of the resistance values of all the collecting lines is less than 10%; finally, manufacturing the batch of finished collecting circuit boards according to the final wiring design. The application can make the deviation of the resistance values of each collecting line of the power battery temperature collector from the average value of the resistance values of all the collecting lines less than 10%, thereby reducing the design difficulty of the line compensation value.

Description

Technical Field

[0001] This invention relates to the field of power battery monitoring, and in particular to a wiring method for a power battery temperature acquisition device. Background Technology

[0002] Currently, a crucial component of electric motor-driven vehicles (such as hybrid electric vehicles, pure electric vehicles, and range-extended electric vehicles) is the power battery. The operation of the power battery is extremely affected by temperature. Therefore, existing electric motor-driven vehicles are equipped with temperature sensors to collect the temperature of the power battery at multiple locations.

[0003] Existing power battery temperature acquisition devices generally include a data acquisition circuit board, connection terminals mounted on the circuit board, and multiple thermistors. Each thermistor is located at the point on the power battery where temperature needs to be measured. Each thermistor is connected to the connection terminals via two acquisition lines on the circuit board. However, the resistance of the acquisition lines themselves affects the measured resistance value of the thermistors. Therefore, when measuring the resistance value of the thermistors, a line compensation value needs to be designed to compensate for the detection deviation caused by the resistance of the acquisition lines. However, in existing power battery temperature acquisition devices, the resistances of the various acquisition lines connected to the thermistors are not identical or completely different. This necessitates designing a corresponding line compensation value for each thermistor, which is extremely cumbersome.

[0004] In view of the above problems, it is necessary to study a wiring method for a power battery temperature acquisition device that can make the deviation between the resistance of each acquisition line of the power battery temperature acquisition device and the average resistance value of all acquisition lines less than 10%. In this way, only one line compensation value is needed to perform relatively accurate line resistance compensation for each thermistor. Summary of the Invention

[0005] The purpose of this invention is to provide a wiring method for a power battery temperature acquisition device, which enables the deviation between the resistance of each acquisition line of the power battery temperature acquisition device and the average resistance value of all acquisition lines to be less than 10%. In this way, only one line compensation value is needed to perform relatively accurate line resistance compensation for each thermistor.

[0006] To achieve the above objectives, the solution of the present invention is: A wiring method for a power battery temperature acquisition device, characterized by the following steps: Step 1: Determine the size of the acquisition circuit board and the number of thermistors based on the structure of the power battery and the number of parts of the power battery that need to be temperature-collected. Step 2: Conduct preliminary wiring design: First, in the wiring software, the positions of each resistor pad group on the acquisition circuit board are designed according to the various parts of the power battery that need to be temperature collected. The resistor pad group is used to connect the thermistor and includes two adjacent acquisition pads. Meanwhile, in the wiring software, the position of the terminal pad group on the acquisition circuit board is designed according to the required signal output position. The terminal pad group is used to connect with the connection terminal and includes multiple terminal pads arranged side by side. Then, the wiring software generates multiple acquisition lines on the acquisition circuit board that connect each acquisition pad of each resistor pad group to the terminal pad of the terminal pad group one-to-one. Step 3: Fabricate the acquisition circuit board based on the preliminary wiring design; Step 4: First, measure the resistance of each acquisition line on the fabricated acquisition circuit board; then, based on the deviation of the resistance value of each acquisition line from the average resistance value of all acquisition lines, adjust the local line width of that acquisition line in the routing software accordingly to obtain a new routing design; finally, fabricate a new acquisition circuit board based on the new routing design. Step 5: Repeat step 4 until the deviation between the resistance value of each acquisition line on the acquisition circuit board and the average resistance value of all acquisition lines is less than 10%, and the final wiring design is obtained. Step Six: Based on the final wiring design, mass-produce the finished acquisition circuit board, and solder the two acquisition pins of the thermistor to the two resistor pads of the resistor pad group of the finished acquisition circuit board, and solder the various connection pins of the connection terminals to the various terminal pads of the terminal pad group of the finished acquisition circuit board.

[0007] The resistance pad group also includes a grounding pad arranged adjacent to the acquisition pad; in step two, the wiring software also generates multiple grounding lines on the acquisition circuit board to connect each grounding pad of each resistance pad group to the terminal pad of the terminal pad group one-to-one; in step six, the grounding pin of the thermistor is soldered to the grounding pad of the resistance pad group of the acquisition circuit board.

[0008] In step two, when the wiring software generates multiple acquisition lines on the acquisition circuit board that connect each acquisition pad of each resistor pad group to the terminal pad of the terminal pad group one-to-one, the wiring software adjusts the length of the acquisition line accordingly based on the distance between each resistor pad group and the terminal pad group, designing the number of bends of the acquisition line connected to that resistor pad group, so that the length difference between each acquisition line and the longest acquisition line does not exceed 30% of the length of the longest acquisition line.

[0009] The acquisition circuit board is a flexible circuit board.

[0010] After adopting the above scheme, the wiring method of the power battery temperature acquisition device of the present invention can achieve a result where the deviation between the resistance value of each acquisition line on the acquisition circuit board and the average resistance value of all acquisition lines is less than 10%. This means that when subsequently detecting the resistance value of each thermistor in the power battery temperature acquisition device, only one line compensation value is needed to accurately compensate the line resistance of each thermistor, greatly reducing the design difficulty of the line compensation value. Specifically, the present invention mainly utilizes the adjustment of the local line width of the acquisition lines to adjust the resistance value of the acquisition lines. This adjustment method is more flexible, thereby enabling faster adjustment of the resistance value of each acquisition line on the acquisition circuit board to a point where the deviation between the resistance value of each acquisition line 13 and the average resistance value of all acquisition lines is less than 10%. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the acquisition circuit board of the present invention.

[0012] Label Explanation: The circuit board consists of 1, 11, 111, 112, 12, 12, 121, 13, and 14. Detailed Implementation

[0013] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0014] like Figure 1 As shown, this invention discloses a wiring method for a power battery temperature acquisition device, which includes the following steps: Step 1: Determine the size of the acquisition circuit board 1 and the number of thermistors based on the structure of the power battery and the number of parts of the power battery that need to be temperature-collected. Step 2: Conduct preliminary wiring design: First, in the wiring software, the positions of each resistor pad group 11 on the acquisition circuit board 1 are designed according to the various parts of the power battery that need to be temperature collected. The resistor pad group 11 is used to connect the thermistor. The resistor pad group 11 includes two adjacent acquisition pads 111. Meanwhile, in the wiring software, the position of the terminal pad group 12 on the acquisition circuit board 1 is designed according to the required signal output position. The terminal pad group 12 is used to connect with the connection terminal. The terminal pad group 12 includes multiple terminal pads 121 arranged side by side. Then, the wiring software generates multiple acquisition lines 13 on the acquisition circuit board 1, which connect each acquisition pad 111 of each resistor pad group 11 to the terminal pad 121 of the terminal pad group 12 one-to-one. Step 3: Fabricate the acquisition circuit board 1 based on the preliminary wiring design; Step 4: First, measure the resistance value of each acquisition line 13 on the fabricated acquisition circuit board 1; Then, based on the deviation between the resistance value of each acquisition line 13 and the average resistance value of all acquisition lines 13, the local line width of the acquisition line 13 is adjusted accordingly in the wiring software to obtain a new wiring design. Finally, based on the new wiring design, the new acquisition circuit board 1 was fabricated again. Step 5: Repeat step 4 until the deviation between the resistance value of each acquisition line on the acquisition circuit board 1 and the average resistance value of all acquisition lines is less than 10%, and the final wiring design is obtained. Step 6: Based on the final wiring design, mass-produce the acquisition circuit board 1, and solder the two acquisition pins of the thermistor to the two resistor pads 111 of the resistor pad group 11 of the acquisition circuit board 1, and solder the connection pins of the connection terminals to the terminal pads 121 of the terminal pad group 12 of the acquisition circuit board 1.

[0015] In this invention, the wiring method of a power battery temperature acquisition device ensures that the deviation between the resistance value of each acquisition line 13 on the acquisition circuit board 1 and the average resistance value of all acquisition lines is less than 10%. This allows for precise line resistance compensation for each thermistor in subsequent resistance value detection using only a single line compensation value, significantly reducing the design complexity of the line compensation value. Specifically, this invention primarily utilizes the adjustment of the local line width of the acquisition line 13 to adjust its resistance value. This adjustment method is more flexible and allows for faster adjustment of the resistance value of each acquisition line 13 on the acquisition circuit board 1 to a level where the deviation between the resistance value of each acquisition line 13 and the average resistance value of all acquisition lines is less than 10%. When adjusting the local line width of the acquisition line 13, priority is given to adjusting the outer, less open portion of the acquisition line 13 (i.e., the portion with larger line spacing).

[0016] In an embodiment of the present invention, the acquisition circuit board 1 is a flexible circuit board, so that the power battery temperature acquisition device can be flexibly arranged on the power battery; of course, the acquisition circuit board 1 can also be a PCB circuit board.

[0017] In an embodiment of the present invention, in step two, when the wiring software generates multiple acquisition lines 13 on the acquisition circuit board 1 that connect each acquisition pad 111 of each resistor pad group 11 to the terminal pad 121 of the terminal pad group 12 one-to-one, the wiring software adjusts the length of the acquisition line 13 accordingly based on the distance between each resistor pad group 11 and the terminal pad group 12, designing the number of bends of the acquisition line 13 connected to that resistor pad group 11, so that the length difference between each acquisition line 13 and the longest acquisition line 13 does not exceed 30% of the length of the longest acquisition line 13. This configuration ensures that the deviation between the resistance value of each acquisition line 13 on the acquisition circuit board 1 and the average resistance value of all acquisition lines is less than 10% by adjusting the line width.

[0018] Cooperate Figure 1 As shown, in an embodiment of the present invention, the resistor pad group 11 further includes a grounding pad 112 adjacent to the acquisition pad 111; in step two, the wiring software also generates multiple grounding lines 14 on the acquisition circuit board 1 to connect each grounding pad 112 of each resistor pad group 11 to the terminal pad 121 of the terminal pad group 12; in step six, the grounding pin of the thermistor is soldered to the grounding pad 112 of the resistor pad group 11 of the finished acquisition circuit board 1. The grounding pad 112 and the grounding lines 14 ensure that the thermistor is reliably grounded, and the resistance value of the grounding lines 14 does not affect the resistance value measurement of the thermistor.

[0019] The above embodiments and figures are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A wiring method for a power battery temperature acquisition device, characterized in that: Includes the following steps: Step 1: Determine the size of the acquisition circuit board and the number of thermistors based on the structure of the power battery and the number of parts of the power battery that need to be temperature-collected. Step 2: Conduct preliminary wiring design: First, in the wiring software, the positions of each resistor pad group on the acquisition circuit board are designed according to the various parts of the power battery that need to be temperature collected. The resistor pad group is used to connect the thermistor and includes two adjacent acquisition pads. Meanwhile, in the wiring software, the position of the terminal pad group on the acquisition circuit board is designed according to the required signal output position. The terminal pad group is used to connect with the connection terminal and includes multiple terminal pads arranged side by side. Then, the wiring software generates multiple acquisition lines on the acquisition circuit board that connect each acquisition pad of each resistor pad group to the terminal pad of the terminal pad group one-to-one. Step 3: Fabricate the acquisition circuit board based on the preliminary wiring design; Step 4: First, measure the resistance value of each acquisition line on the fabricated acquisition circuit board; Then, based on the deviation between the resistance value of each acquisition line and the average resistance value of all acquisition lines, the local line width of the acquisition line is adjusted accordingly in the wiring software to obtain a new wiring design; finally, a new acquisition circuit board is fabricated based on the new wiring design. Step 5: Repeat step 4 until the deviation between the resistance value of each acquisition line on the acquisition circuit board and the average resistance value of all acquisition lines is less than 10%, and the final wiring design is obtained. Step Six: Based on the final wiring design, mass-produce the finished acquisition circuit board, and solder the two acquisition pins of the thermistor to the two resistor pads of the resistor pad group of the finished acquisition circuit board, and solder the various connection pins of the connection terminals to the various terminal pads of the terminal pad group of the finished acquisition circuit board.

2. The wiring method for a power battery temperature acquisition device as described in claim 1, characterized in that: The resistance pad group also includes a grounding pad disposed adjacent to the acquisition pad; In step two, the wiring software also generates multiple grounding lines on the acquisition circuit board that connect each grounding pad of each resistor pad group to the terminal pad of the terminal pad group one-to-one. In step six, the grounding pin of the thermistor is soldered to the grounding pad of the resistor pad group of the finished circuit board.

3. The wiring method for a power battery temperature acquisition device as described in claim 1, characterized in that: In step two, when the wiring software generates multiple acquisition lines on the acquisition circuit board that connect each acquisition pad of each resistor pad group to the terminal pad of the terminal pad group one-to-one, the wiring software adjusts the length of the acquisition line accordingly based on the distance between each resistor pad group and the terminal pad group, designing the number of bends of the acquisition line connected to that resistor pad group, so that the length difference between each acquisition line and the longest acquisition line does not exceed 30% of the length of the longest acquisition line.

4. The wiring method for a power battery temperature acquisition device as described in claim 1, characterized in that: The acquisition circuit board is a flexible circuit board.

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