阅读说明：本技术 一种锂电池测试设备自动校准工装及方法 (Automatic calibration tool and method for lithium battery testing equipment ) 是由 刘作斌 任行斌 方梓良 于 2021-08-26 设计创作，主要内容包括：本发明提供了锂电池测试设备技术领域的一种锂电池测试设备自动校准工装及方法,工装包括电动转换开关K1、开关K2、开关K3、开关K4、开关K5、开关K6、电流表A、电压表V、MCU以及上位机；所述电动转换开关K1的引脚5与开关K2以及开关K3连接,引脚6与电压表V的负极、开关K6以及引脚8连接,引脚7与开关K4以及开关K5连接；所述电流表A的一端与开关K3以及开关K5连接,另一端与开关K2、开关K4、开关K6以及电压表V的正极连接；所述MCU的一端与上位机连接,另一端与所述电动转换开关K1、开关K2、开关K3、开关K4、开关K5、开关K6、电流表A以及电压表V连接。本发明的优点在于：极大的提升了锂电池测试设备的校准效率以及质量。(The invention provides an automatic calibration tool and an automatic calibration method for lithium battery testing equipment, which belong to the technical field of lithium battery testing equipment, wherein the tool comprises an electric change-over switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a switch K6, an ammeter A, a voltmeter V, MCU and an upper computer; pin 5 of the electric change-over switch K1 is connected with a switch K2 and a switch K3, pin 6 is connected with the negative electrode of a voltmeter V, a switch K6 and a pin 8, and pin 7 is connected with a switch K4 and a switch K5; one end of the ammeter A is connected with the switch K3 and the switch K5, and the other end of the ammeter A is connected with the switch K2, the switch K4, the switch K6 and the anode of the voltmeter V; one end of the MCU is connected with an upper computer, and the other end of the MCU is connected with the electric change-over switch K1, the switch K2, the switch K3, the switch K4, the switch K5, the switch K6, the ammeter A and the voltmeter V. The invention has the advantages that: calibration efficiency and quality of lithium battery test equipment have greatly been promoted.)

1. The utility model provides a lithium battery test equipment automatic calibration frock which characterized in that: comprises an electric change-over switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a switch K6, an ammeter A, a voltmeter V, an MCU and an upper computer;

pin 5 of the electric change-over switch K1 is connected with a switch K2 and a switch K3, pin 6 is connected with the negative electrode of a voltmeter V, a switch K6 and a pin 8, and pin 7 is connected with a switch K4 and a switch K5; one end of the ammeter A is connected with the switch K3 and the switch K5, and the other end of the ammeter A is connected with the switch K2, the switch K4, the switch K6 and the anode of the voltmeter V;

one end of the MCU is connected with an upper computer, and the other end of the MCU is connected with the electric change-over switch K1, the switch K2, the switch K3, the switch K4, the switch K5, the switch K6, the ammeter A and the voltmeter V.

2. The automatic calibration tool for the lithium battery testing equipment according to claim 1, characterized in that: the switch K2, the switch K3, the switch K4, the switch K5 and the switch K6 are all relays.

3. The automatic calibration tool for the lithium battery testing equipment according to claim 1, characterized in that: the ammeter A is an intelligent ammeter.

4. The automatic calibration tool for the lithium battery testing equipment according to claim 1, characterized in that: the voltmeter V is an intelligent voltmeter.

5. The automatic calibration tool for the lithium battery testing equipment according to claim 1, characterized in that: the MCU is connected with the upper computer through the communication module.

6. The automatic calibration tool for the lithium battery testing equipment according to claim 5, characterized in that: the communication module is a 2G communication module, a 3G communication module, a 4G communication module, a 5G communication module, an NB-IOT communication module, an LORA communication module, a WIFI communication module, a Bluetooth communication module, a ZigBee communication module or an Ethernet communication module.

7. The automatic calibration tool for the lithium battery testing equipment according to claim 1, characterized in that: the power supply module is connected with the MCU.

8. An automatic calibration method for lithium battery test equipment is characterized by comprising the following steps: the method requires the use of a calibration tool according to any one of claims 1 to 7, comprising the steps of:

step S10, connecting the electric change-over switch K1 with lithium battery test equipment to be calibrated;

s20, editing a calibration process step of the lithium battery testing equipment through the upper computer, and sending the calibration process step to the MCU;

step S30, the MCU automatically controls pins 1 and 2 of the electric change-over switch K1 to be communicated with a channel to be calibrated of the lithium battery test equipment based on the received calibration process step, and automatically controls pins 3 and 4 of the electric change-over switch K1 to be randomly communicated with the rest one channel of the lithium battery test equipment;

s40, controlling the output voltage and the output current of the lithium battery testing equipment by the upper computer based on the calibration step; the MCU controls the on-off of the switch K2, the switch K3, the switch K4, the switch K5 and the switch K6 based on the calibration process step, and performs charging voltage value calibration, charging current value calibration and discharging current value calibration;

step S50, the MCU collects calibrated calibration data through the voltmeter and the ammeter and sends the calibrated calibration data to the upper computer;

and step S60, the upper computer automatically generates a calibration report after verifying the received calibration data.

9. The automatic calibration method of lithium battery test equipment as claimed in claim 8, wherein: in step S20, the calibration process specifically includes:

setting voltage loading value U_i1And U_i2Current loading value I_i1And I_i2；

A calibration step a:

the switch K2 is turned on, the switch K3, the switch K4, the switch K5 and the switch K6 are turned off, and when the output voltage of the lithium battery testing equipment is U_i1Then, the actual voltage is measured as U by a voltmeter V_o1When the output voltage of the lithium battery testing equipment is U_i2Then, the actual voltage is measured as U by a voltmeter V_o2Based on said voltage U_i1、U_o1、U_i2And U_o2Obtaining a voltage calibration coefficient k₁And b₁：

Calibrating the coefficient k using the voltage₁And b₁Calibrating a charging voltage value;

b, a calibration step:

the switch K3 and the switch K6 are turned on, and the switch K2, the switch K4 and the switch K5 are turned off, when the output current of the lithium battery test equipment is I_i1Then, the actual charging current is measured as I by an ammeter A_o1When the output current of the lithium battery testing equipment is I_i2Then, the actual charging current is measured as I by an ammeter A_o2Based on said current I_i1、I_o1、I_i2And I_o2Obtaining a charging current calibration coefficient k₂And b₂：

Calibrating a coefficient k using the charging current₂And b₂Calibrating the charging current value;

a calibration step c:

the switch K3 and the switch K4 are turned on, and the switch K2, the switch K5 and the switch K6 are turned off, when the input current of the lithium battery test equipment is I_i1Then, the actual charging current is measured as I by an ammeter A_o3When the input current of the lithium battery testing equipment is I_i2Then, the actual charging current is measured as I by an ammeter A_o4Based on said current I_i1、I_o3、I_i2And I_o4Obtaining a discharge current calibration coefficient k₃And b₃：

Calibrating the coefficient k using the discharge current₃And b₃And calibrating the discharge current value.

10. The automatic calibration method of lithium battery test equipment as claimed in claim 8, wherein: the step S60 specifically includes:

the upper computer randomly selects a plurality of voltage values and current values from the calibration data, judges whether the errors between the voltage values and the current values and the set output voltage and output current are smaller than a preset threshold value or not, and generates a calibration report of successful calibration if the errors are smaller than the preset threshold value; if not, generating a calibration report of calibration failure.

Technical Field

The invention relates to the technical field of lithium battery testing equipment, in particular to an automatic calibration tool and method for lithium battery testing equipment.

Background

With the rapid development of new energy technology, the performance of new energy automobiles and related products is continuously improved, and the demand of people on new energy automobiles is rapidly increased. The lithium battery is used as a core component of a new energy automobile, the capacity of the lithium battery is rapidly expanding, and then the demand for production and test equipment of the lithium battery is rapidly increased. Lithium battery test equipment is calibrated before shipment and after installation, and is calibrated periodically in the production of lithium batteries to ensure that the voltage and the current are within the range of precision requirements, otherwise, the performance of the lithium batteries is influenced.

Calibration to lithium battery test equipment, traditionally need be to equipment such as voltmeter, ampere meter, the power that discharges of manual access respectively of charging voltage value calibration, charging current value calibration, the calibration of the current value of discharging, constantly wiring changes the load type to need people's eye to discern the reading on voltmeter and the ampere meter and calculate, lead to having following shortcoming:

when needing to calibrate in the face of a large amount of lithium battery test equipment, and each lithium battery test equipment contains a plurality of passageways of treating the calibration, calculates through artifical wiring and reading, and not only inefficiency, the difficult degree of operation is big on the press after the installation, and produces fatigue easily and then leads to the calibration error, and then has restricted lithium battery test equipment's shipment and the productivity of lithium cell.

Therefore, how to provide an automatic calibration tool and method for lithium battery test equipment to improve calibration efficiency and quality of the lithium battery test equipment becomes a problem to be solved urgently.

Disclosure of Invention

The invention aims to solve the technical problem of providing an automatic calibration tool and method for lithium battery testing equipment, so that the calibration efficiency and quality of the lithium battery testing equipment are improved.

In a first aspect, the invention provides an automatic calibration tool for lithium battery testing equipment, which comprises an electric change-over switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a switch K6, an ammeter A, a voltmeter V, an MCU and an upper computer;

pin 5 of the electric change-over switch K1 is connected with a switch K2 and a switch K3, pin 6 is connected with the negative electrode of a voltmeter V, a switch K6 and a pin 8, and pin 7 is connected with a switch K4 and a switch K5; one end of the ammeter A is connected with the switch K3 and the switch K5, and the other end of the ammeter A is connected with the switch K2, the switch K4, the switch K6 and the anode of the voltmeter V;

one end of the MCU is connected with an upper computer, and the other end of the MCU is connected with the electric change-over switch K1, the switch K2, the switch K3, the switch K4, the switch K5, the switch K6, the ammeter A and the voltmeter V.

Further, the switch K2, the switch K3, the switch K4, the switch K5 and the switch K6 are all relays.

Further, the ammeter A is an intelligent ammeter.

Further, the voltmeter V is an intelligent voltmeter.

Further, the device also comprises a communication module, and the MCU is connected with the upper computer through the communication module.

Further, the communication module is a 2G communication module, a 3G communication module, a 4G communication module, a 5G communication module, an NB-IOT communication module, an LORA communication module, a WIFI communication module, a Bluetooth communication module, a ZigBee communication module or an Ethernet communication module.

Furthermore, the device also comprises a power supply module which is connected with the MCU.

In a second aspect, the present invention provides an automatic calibration method for a lithium battery test device, including the following steps:

step S10, connecting the electric change-over switch K1 with lithium battery test equipment to be calibrated;

s20, editing a calibration process step of the lithium battery testing equipment through the upper computer, and sending the calibration process step to the MCU;

step S30, the MCU automatically controls pins 1 and 2 of the electric change-over switch K1 to be communicated with a channel to be calibrated of the lithium battery test equipment based on the received calibration process step, and automatically controls pins 3 and 4 of the electric change-over switch K1 to be randomly communicated with the rest one channel of the lithium battery test equipment;

s40, controlling the output voltage and the output current of the lithium battery testing equipment by the upper computer based on the calibration step; the MCU controls the on-off of the switch K2, the switch K3, the switch K4, the switch K5 and the switch K6 based on the calibration process step, and performs charging voltage value calibration, charging current value calibration and discharging current value calibration;

step S50, the MCU collects calibrated calibration data through the voltmeter and the ammeter and sends the calibrated calibration data to the upper computer;

and step S60, the upper computer automatically generates a calibration report after verifying the received calibration data.

Further, in step S20, the calibration process specifically includes:

setting voltage loading value U_i1And U_i2Current loading value I_i1And I_i2；

A calibration step a:

the switch K2 is turned on, the switch K3, the switch K4, the switch K5 and the switch K6 are turned off, and when the output voltage of the lithium battery testing equipment is U_i1Then, the actual voltage is measured as U by a voltmeter V_o1When the output voltage of the lithium battery testing equipment is U_i2Then, the actual voltage is measured as U by a voltmeter V_o2Based on said voltage U_i1、U_o1、U_i2And U_o2Obtaining a voltage calibration coefficient k₁And b₁：

Calibrating the coefficient k using the voltage₁And b₁Calibrating a charging voltage value;

b, a calibration step:

the switch K3 and the switch K6 are turned on, and the switch K2, the switch K4 and the switch K5 are turned off, when the output current of the lithium battery test equipment is I_i1Then, the actual charging current is measured as I by an ammeter A_o1When the output current of the lithium battery testing equipment is I_i2Then, the actual charging current is measured as I by an ammeter A_o2Based on said current I_i1、I_o1、I_i2AndI_o2obtaining a charging current calibration coefficient k₂And b₂：

Calibrating a coefficient k using the charging current₂And b₂Calibrating the charging current value;

a calibration step c:

the switch K3 and the switch K4 are turned on, and the switch K2, the switch K5 and the switch K6 are turned off, when the input current of the lithium battery test equipment is I_i1Then, the actual charging current is measured as I by an ammeter A_o3When the input current of the lithium battery testing equipment is I_i2Then, the actual charging current is measured as I by an ammeter A_o4Based on said current I_i1、I_o3、I_i2And I_o4Obtaining a discharge current calibration coefficient k₃And b₃：

Calibrating the coefficient k using the discharge current₃And b₃And calibrating the discharge current value.

Further, the step S60 is specifically:

the upper computer randomly selects a plurality of voltage values and current values from the calibration data, judges whether the errors between the voltage values and the current values and the set output voltage and output current are smaller than a preset threshold value or not, and generates a calibration report of successful calibration if the errors are smaller than the preset threshold value; if not, generating a calibration report of calibration failure.

The invention has the advantages that:

1. the electric change-over switch K1 is arranged, the channel to be calibrated of the lithium battery testing equipment is automatically switched, the switch K2, the switch K3, the switch K4, the switch K5 and the switch K6 are all relays, the MCU can automatically switch the load type by controlling the on-off of the switch K2, the switch K3, the switch K4, the switch K5 and the switch K6, and the power supply connected with the ammeter A, the voltmeter V or the lithium battery testing equipment is selected, so that compared with the traditional manual wiring, the wiring efficiency is greatly improved, and the fault caused by manual wiring is avoided; through setting up ampere meter A for intelligent ampere meter, voltmeter V is intelligent voltmeter, MCU can directly acquire ampere meter A and voltmeter V's measured data and send for the host computer and carry out computational analysis, calculates for artifical reading, has not only promoted the efficiency that measured data acquireed, also avoids seeing the eye of walking because of tired, the final very big calibration efficiency and the quality that has promoted lithium battery test equipment.

2. Through letting pin 3 and 4 of electronic change over switch K1 communicate the remaining one of them passageway of lithium battery test equipment at random, let one of them passageway of lithium battery test equipment act as the power that discharges promptly and discharge, need not additionally insert a power that discharges, and then reduced the volume of calibration frock to calibration cost has been reduced.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

Fig. 1 is a circuit diagram of an automatic calibration tool for a lithium battery testing device according to the present invention.

Fig. 2 is a circuit diagram of a use state of the automatic calibration tool for the lithium battery test equipment according to the present invention.

Fig. 3 is a schematic circuit block diagram of an automatic calibration tool for a lithium battery test device according to the present invention.

Fig. 4 is a flowchart of an automatic calibration method for a lithium battery testing device according to the present invention.

Detailed Description

The technical scheme in the embodiment of the application has the following general idea: set up electronic change over switch K1 automatic switch lithium cell test equipment and treat the passageway of calibration, through control switch K2, switch K3, switch K4, switch K5 and switch K6's break-make automatic switch load type, need not manual wiring, directly acquire ammeter A and voltmeter V's measured data and send for the host computer and carry out the computational analysis through MCU, needn't artifical reading calculation, with calibration efficiency and the quality that promotes lithium cell test equipment.

Referring to fig. 1 to 4, a preferred embodiment of an automatic calibration tool for a lithium battery testing device according to the present invention includes an electric transfer switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a switch K6, an ammeter a (or a shunt), a voltmeter V, an MCU, and an upper computer;

the electric change-over switch K1 is also called a combined switch, is a low-voltage switch for switching multiple loops, a plurality of moving contacts are welded on a shaft in an overlapping way, when the shaft rotates, the moving contacts are sequentially connected with or disconnected with static contacts, and a circuit is switched to be connected from one channel to another channel; the switch K2, the switch K3, the switch K4, the switch K5 and the switch K6 are used for switching calibration items; the ammeter A is used for measuring current and further carrying out charging current value calibration and discharging current value calibration; the voltmeter V is used for measuring voltage and further calibrating a charging voltage value; the MCU is used for controlling a channel connected with the electric change-over switch K1, controlling the on-off of the switch K2, the switch K3, the switch K4, the switch K5 and the switch K6, receiving the measurement data of the ammeter A and the voltmeter V and sending the measurement data to the upper computer, and in the specific implementation, the MCU capable of realizing the function is selected from the prior art and is not limited to any model, for example, an MCU of an STM32F103 series of ST company, and the control program is well known by the technicians in the field, so that the MCU can be obtained by the technicians in the field without creative work; the upper computer is used for controlling the work of the calibration tool;

pin 5 of the electric change-over switch K1 is connected with a switch K2 and a switch K3, pin 6 is connected with the negative electrode of a voltmeter V, a switch K6 and a pin 8, and pin 7 is connected with a switch K4 and a switch K5; one end of the ammeter A is connected with the switch K3 and the switch K5, and the other end of the ammeter A is connected with the switch K2, the switch K4, the switch K6 and the anode of the voltmeter V; pins 1, 2, 3 and 4 of the electric change-over switch K1 are respectively connected with pins 5, 6, 7 and 8;

one end of the MCU is connected with an upper computer, and the other end of the MCU is connected with the electric change-over switch K1, the switch K2, the switch K3, the switch K4, the switch K5, the switch K6, the ammeter A and the voltmeter V.

The switch K2, the switch K3, the switch K4, the switch K5 and the switch K6 are relays, and on-off control is performed through the MCU.

The ammeter A is an intelligent ammeter and can directly send measured current data to the MCU.

The voltmeter V is an intelligent voltmeter and can directly send measured voltage data to the MCU.

The MCU is connected with the upper computer through the communication module and used for communication between the MCU and the upper computer.

The communication module is a 2G communication module, a 3G communication module, a 4G communication module, a 5G communication module, an NB-IOT communication module, an LORA communication module, a WIFI communication module, a Bluetooth communication module, a ZigBee communication module or an Ethernet communication module.

The calibration tool is characterized by further comprising a power module which is connected with the MCU and used for supplying power to the calibration tool.

The invention discloses a preferred embodiment of an automatic calibration method of lithium battery test equipment, which comprises the following steps:

step S10, connecting the electric change-over switch K1 with lithium battery test equipment to be calibrated;

s20, editing a calibration process step of the lithium battery testing equipment through the upper computer, and sending the calibration process step to the MCU;

step S30, the MCU automatically controls the pins 1 and 2 of the electric change-over switch K1 to be communicated with a channel to be calibrated of the lithium battery test equipment based on the received calibration process step, and automatically controls the pins 3 and 4 of the electric change-over switch K1 to be randomly communicated with the rest one of the channels of the lithium battery test equipment, namely one of the channels of the lithium battery test equipment is used as a discharge power supply to discharge without additionally connecting a discharge power supply, so that the volume of the calibration tool is reduced, and the calibration cost is reduced;

s40, controlling the output voltage and the output current of the lithium battery testing equipment by the upper computer based on the calibration step; the MCU controls the on-off of the switch K2, the switch K3, the switch K4, the switch K5 and the switch K6 based on the calibration process step, and performs charging voltage value calibration, charging current value calibration and discharging current value calibration;

step S50, the MCU collects calibrated calibration data through the voltmeter and the ammeter and sends the calibrated calibration data to the upper computer;

and step S60, the upper computer automatically generates a calibration report after verifying the received calibration data.

In step S20, the calibration process specifically includes:

setting voltage loading value U_i1And U_i2Current loading value I_i1And I_i2；

A calibration step a:

the switch K2 is turned on, the switch K3, the switch K4, the switch K5 and the switch K6 are turned off, and when the output voltage of the lithium battery testing equipment is U_i1Then, the actual voltage is measured as U by a voltmeter V_o1When the output voltage of the lithium battery testing equipment is U_i2Then, the actual voltage is measured as U by a voltmeter V_o2Based on said voltage U_i1、U_o1、U_i2And U_o2Obtaining a voltage calibration coefficient k₁And b₁：

Calibrating the coefficient k using the voltage₁And b₁Calibrating a charging voltage value;

b, a calibration step:

the switch K3 and the switch K6 are turned on, and the switch K2, the switch K4 and the switch K5 are turned off, when the output current of the lithium battery test equipment is I_i1Then, the actual charging current is measured as I by an ammeter A_o1When the output current of the lithium battery testing equipment is I_i2Then, the actual charging current is measured as I by an ammeter A_o2Based on said current I_i1、I_o1、I_i2And I_o2Obtaining a charging current calibration coefficient k₂And b₂：

Calibrating a coefficient k using the charging current₂And b₂Calibrating the charging current value;

a calibration step c:

the switch K3 and the switch K4 are turned on, and the switch K2, the switch K5 and the switch K6 are turned off, when the input current of the lithium battery test equipment is I_i1Then, the actual charging current is measured as I by an ammeter A_o3When the input current of the lithium battery testing equipment is I_i2Then, the actual charging current is measured as I by an ammeter A_o4Based on said current I_i1、I_o3、I_i2And I_o4Obtaining a discharge current calibration coefficient k₃And b₃：

Calibrating the coefficient k using the discharge current₃And b₃And calibrating the discharge current value.

The step S60 specifically includes:

the upper computer randomly selects a plurality of voltage values and current values from the calibration data, judges whether the errors between the voltage values and the current values and the set output voltage and output current are smaller than a preset threshold value or not, and generates a calibration report of successful calibration if the errors are smaller than the preset threshold value; if not, generating a calibration report of calibration failure. For example, the preset threshold is 1%, 5 voltage values are randomly selected from the calibration data, and whether the error between the 5 voltage values and the set output voltage is less than 1% or not is judged, which indicates that the charging voltage value is successfully calibrated. Through right calibration data is verified, is convenient for carry out further maintenance to the lithium cell test equipment that the verification is not passed through, has further promoted lithium cell test equipment's calibration quality.

In summary, the invention has the advantages that:

1. the electric change-over switch K1 is arranged, the channel to be calibrated of the lithium battery testing equipment is automatically switched, the switch K2, the switch K3, the switch K4, the switch K5 and the switch K6 are all relays, the MCU can automatically switch the load type by controlling the on-off of the switch K2, the switch K3, the switch K4, the switch K5 and the switch K6, and the power supply connected with the ammeter A, the voltmeter V or the lithium battery testing equipment is selected, so that compared with the traditional manual wiring, the wiring efficiency is greatly improved, and the fault caused by manual wiring is avoided; through setting up ampere meter A for intelligent ampere meter, voltmeter V is intelligent voltmeter, MCU can directly acquire ampere meter A and voltmeter V's measured data and send for the host computer and carry out computational analysis, calculates for artifical reading, has not only promoted the efficiency that measured data acquireed, also avoids seeing the eye of walking because of tired, the final very big calibration efficiency and the quality that has promoted lithium battery test equipment.

2. Through letting pin 3 and 4 of electronic change over switch K1 communicate the remaining one of them passageway of lithium battery test equipment at random, let one of them passageway of lithium battery test equipment act as the power that discharges promptly and discharge, need not additionally insert a power that discharges, and then reduced the volume of calibration frock to calibration cost has been reduced.

Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.