An OCV testing device for dual-terminal batteries

Abstract

This invention discloses an OCV testing device for dual-terminal batteries, relating to the field of battery OCV testing technology. It includes a frame assembly with a conveying assembly within it for transporting the battery under test. A lifting assembly is located at the bottom of the conveying assembly, and testing assemblies are positioned on both sides of the conveying assembly. The conveying assembly transports the battery under test above the lifting assemblies, which then lift it to the testing position on the testing assemblies. A metal shield assembly is located above the lifting assemblies, comprising a metal shield and a channel switching module. By adding a metal shield, this invention covers the battery under test during testing, thus eliminating the influence of eddy currents on AC internal resistance testing. This ensures the stability and consistency of the AC internal resistance value even when the testing environment changes.

Description

Technical Field

[0001] This invention relates to the field of battery OCV testing technology, and more specifically to an OCV testing device for dual-terminal batteries. Background Technology

[0002] Because the terminals of a dual-terminal battery are located at both ends of the battery, with a significant distance between the positive and negative terminals, existing dual-terminal battery OCV testing equipment uses current and voltage lines from the positive and negative probes, which are routed from both ends of the battery to the terminal connections of the channel switching board. While the instrument can typically obtain a relatively stable voltage value when testing DC voltage, the test environment has a significant impact on the AC internal resistance test value. Changes in the test environment around the battery can lead to a large error in the consistency of the AC internal resistance test, thus failing to meet the actual needs of the equipment for testing dual-terminal batteries. This results in inaccuracies in the AC internal resistance test and makes equipment debugging difficult.

[0003] Meanwhile, because the positive and negative terminals of a dual-terminal battery are located at opposite ends of the battery and are far apart, the current and voltage cables in the test cables form a large AC loop area across the positive and negative terminals. The AC current generated by the internal resistance meter induces eddy currents on the metal plate surrounding the equipment. These induced eddy currents generate an induced voltage on the test cables. Since this induced voltage is 180° out of phase with the AC current, it cannot be eliminated through circuit design. This results in significant differences in the AC internal resistance value error when the battery is tested under different conditions. When the battery tray is full or not full, the eddy current changes, and the difference in AC internal resistance value error between the two environments (full and partial battery trays) is substantial, failing to meet the equipment's requirements for testing AC internal resistance. Summary of the Invention

[0004] The purpose of this invention is to provide an OCV testing device for dual-terminal batteries to overcome the above-mentioned shortcomings in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an OCV testing device for dual-terminal batteries, comprising a frame assembly, a conveying assembly within the frame assembly for conveying the battery under test, a lifting assembly at the bottom of the conveying assembly, and testing assemblies on both sides of the conveying assembly. The conveying assembly conveys the battery under test to the top of the lifting assembly, which lifts the battery under test to the testing position of the testing assembly. A metal cover assembly is positioned above the lifting assembly, comprising a metal cover and a channel switching module. The channel switching module is equipped with V+, V-, I+, I-, and PB terminals. The addition of the metal cover, which covers the battery under test during testing, eliminates the influence of eddy currents on AC internal resistance testing. The metal cover is added to each channel's battery under test to prevent changes in eddy currents when a battery under test is removed from the tray and an empty battery position is nearby. This results in smaller internal resistance testing errors when the tray is full or not, thus ensuring the stability and consistency of AC internal resistance values ​​even when the testing environment changes.

[0006] Preferably, the metal cover assembly also includes a guide rod, which is disposed on the outside of the metal cover. The metal cover and the guide rod are driven to rise and fall by a lifting cylinder. The metal cover assembly also includes a PCB board, which provides a control basis for the channel switching module. When the guide rod descends, it straightens and guides the battery under test.

[0007] Preferably, the test assembly includes two sets of test probes, which are respectively set to the positive and negative terminals at both ends of the battery under test. The test probes are driven to move laterally by a transverse cylinder. During the test, the transverse cylinder drives the test probes to move laterally to contact the positive and negative terminals of the battery under test.

[0008] Preferably, the metal cover is a 1mm thick stainless steel component, and the inner and outer sides of the metal cover are covered with 0.1mm thick Teflon corrosion-resistant insulating tape to prevent the surface of the battery under test from coming into contact with the metal cover and short-circuiting when the battery under test is covered.

[0009] Preferably, the test probe adopts an L-shaped wide pole probe module, and the current line and voltage line of the test probe corresponding to the positive and negative poles of the battery under test adopt a twisted pair shielded cable with strong anti-interference ability.

[0010] A test wiring method for a dual-terminal battery OCV testing device is shown in the figure. The current lines and voltage lines (i.e., V+, V-, I+, I- lines) on the positive and negative sides of the battery under test are connected to the voltage and current positive and negative terminals of the channel switching module, respectively, corresponding to the V+, V-, I+, and I- terminals of the channel switching module. The shielding layer on the V+, V-, I+, and I- lines is connected to the PB terminal of the channel switching module. The voltage line V+ of the positive terminal of the battery under test in each channel is distributed on the positive side of the battery under test, and the current line I+ is distributed on the negative side. The voltage lines V- and I- of the battery under test (DUT) are distributed on the negative terminal side, and the current lines I+ and I- are also distributed on the negative terminal side and twisted together. The positive current line I+ of the channel switching module is connected to a bolt hole at one end of the metal cover, and the bolt hole at the other end of the metal cover is connected to the test probe I+ on the positive side. The inside and outside of the metal cover are covered with Teflon corrosion-resistant insulating tape to prevent short circuits between the inside and the surface of the DUT. The metal cover acts as the negative terminal of the current lines; during testing, the current passes through the metal cover and then to the other terminal of the probe. This wiring method, which twists the I+ and I- current lines on the same side of the DUT polarity, minimizes the AC loop area, avoids the influence of eddy currents on the AC internal resistance value, and increases the stability of the internal resistance meter test. The metal cover added to each channel's DUT is to mitigate the change in eddy currents when a DUT is removed from the tray or when there is an empty battery slot nearby, resulting in smaller internal resistance test errors when the tray is full or not.

[0011] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0012] 1. This invention adds a metal cover to the battery under test during testing, which eliminates the influence of eddy currents on AC internal resistance testing, thereby ensuring the stability and consistency of AC internal resistance values ​​even if the testing environment is changed.

[0013] 2. This invention connects the current line I- and voltage line V- of the test probe on the negative side of the battery under test to the V- and I- terminals on the channel switching module, and connects the shielding wires of the current and voltage lines to the PB terminal of the channel switching module. The voltage line V+ of the test probe on the positive side of the battery under test is connected to the V+ terminal of the channel switching module, the current line I+ is connected to the positive side bolt hole of the metal cover, and one end of the current line I- is connected to the negative side bolt hole of the metal cover, and the other end is connected to the I- terminal of the channel switching module. The current lines I- and I+ are twisted together and distributed on the negative side, which reduces the AC loop area and thus achieves stability of the AC internal resistance value during testing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments will be briefly described below.

[0015] Figure 1 This is a schematic diagram of the overall structure of the testing equipment of the present invention.

[0016] Figure 2 This is a front view of the metal cover assembly of the present invention.

[0017] Figure 3 This is a side view of the metal cover assembly of the present invention.

[0018] Figure 4 This is a schematic diagram of the wiring of the current lines and voltage lines on the positive and negative sides of the test component of the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Frame assembly; 2. Conveying assembly; 3. Lifting assembly; 4. Testing assembly; 41. Test probe; 5. Metal cover assembly; 51. Metal cover; 52. Guide rod; 53. Lifting cylinder; 54. PCB board; 55. Channel switching module; 6. Battery under test. Detailed Implementation

[0021] Example

[0022] This invention provides, for example Figure 1-4 An OCV testing device for a dual-terminal battery is shown, comprising a frame assembly 1, a conveying assembly 2 within the frame assembly 1 for conveying the battery 6 to be tested, a lifting assembly 3 at the bottom of the conveying assembly 2, and testing assemblies 4 on both sides of the conveying assembly 2. The conveying assembly 2 conveys the battery 6 to be tested above the lifting assembly 3, which lifts the battery 6 to the testing position of the testing assembly 4. A metal cover assembly 5 is positioned above the lifting assembly 3, comprising a metal cover 51 and a channel switching module 55. Module 55 is equipped with V+ terminal, V- terminal, I+ terminal, I- terminal and PB (shielded wire) terminal. The addition of metal cover 51, which covers the battery under test 6 during testing, can eliminate the influence of eddy current on AC internal resistance testing. The metal cover 51 is added to each channel's battery under test 6 so that when a battery under test 6 is removed from the tray and there is an empty battery position near the battery under test 6, the eddy current changes. The internal resistance test error is smaller when the tray is full or not, thus ensuring the stability and consistency of AC internal resistance value even if the test environment is changed.

[0023] Furthermore, in the above technical solution, the metal cover assembly 5 also includes a guide rod 52, which is located outside the metal cover 51. The metal cover 51 and the guide rod 52 are driven to rise and fall by the lifting cylinder 53. The metal cover assembly 5 also includes a PCB board 54, which provides a control basis for the channel switching module 55. When the guide rod 52 descends, it straightens and guides the battery 6 to be tested.

[0024] Furthermore, in the above technical solution, the test component 4 includes two sets of test probes 41, which are respectively set to the positive and negative terminals of the battery under test 6. The test probes 41 are driven to move laterally by a transverse cylinder. During the test, the transverse cylinder drives the test probes 41 to move laterally to contact the positive and negative terminals of the battery under test 6.

[0025] Furthermore, in the above technical solution, the metal cover 51 is a 1mm thick stainless steel component, and the inner and outer sides of the metal cover 51 are covered with 0.1mm thick Teflon corrosion-resistant insulating tape in order to prevent the surface of the battery under test 6 from contacting the metal cover 51 and short-circuiting when 21 covers the battery under test 6.

[0026] Furthermore, in the above technical solution, the test probe 41 adopts an L-shaped wide pole probe module, and the current line and voltage line of the test probe 41 corresponding to the positive and negative poles of the battery under test 6 adopt a twisted pair shielded cable with strong anti-interference ability.

[0027] A test wiring method for a dual-terminal battery OCV test equipment, such as Figure 4As shown, the current lines and voltage lines (i.e., V+, V-, I+, I- lines) on the positive and negative sides of the battery under test 6 are connected to the positive and negative terminals of the channel switching module 55, respectively, corresponding to the V+, V-, I+, and I- terminals of the channel switching module 55. The shielding layer on the V+, V-, I+, and I- lines is connected to the PB (shielded wire) terminal of the channel switching module 55. The voltage line V+ of the positive terminal of the battery under test 6 in each channel is distributed on the positive side of the battery under test 6, and the current line I+ is distributed on the negative terminal of the battery under test 6. The voltage lines V- and I- are distributed on the negative side of the battery under test 6, and the current lines I+ and I- are also distributed on the negative side of the battery under test 6 and twisted together. The positive current line I+ of the channel switching module 55 is connected to the bolt hole at one end of the metal cover 51, and the bolt hole at the other end of the metal cover 51 is connected to the test probe 41I+ on the positive side. The inside and outside of the metal cover 51 are covered with Teflon corrosion-resistant insulating tape to prevent short circuits between the inside and the surface of the battery under test 6. The metal cover 51 is used as the negative terminal of the current lines. During testing, the current passes through the metal cover 51 and then to the other terminal of the probe. The above wiring method, which twists the I+ and I- current lines on the same side of the polarity of the battery under test 6, is to reduce the loop area of ​​the AC circuit, avoid the influence of the generated eddy currents on the AC internal resistance value, and increase the stability of the internal resistance meter test. The metal cover 51 added to each channel of the battery under test 6 is to change the eddy current when the battery under test 6 is removed from the tray and there is an empty battery position near the battery under test 6. This will result in a smaller internal resistance test error when the tray is full or not.

[0028] Working principle: In use, the conveying component 2 transports the battery under test 6 to the top of the lifting component 3. The lifting component 3 then lifts the battery under test 6 to the testing position of the testing component 4. The battery under test 6 is placed in a single layer, with the battery terminals at both ends, compatible with different sized prototype batteries. For example... Figure 4As shown, the positive and negative terminals are far apart at both ends of the battery under test 6. Therefore, this device adds a metal cover 51 made of 1mm thick stainless steel. The inside of the metal cover 51 needs to be fully covered with 0.1mm thick Teflon corrosion-resistant insulating tape to prevent short circuits between the surface of the battery under test 6 and the metal cover 51 when the cover 21 is placed over it. This eliminates the influence of eddy currents on the AC internal resistance test, ensuring the stability and consistency of the AC internal resistance value even if the test environment is changed. The current line I- and voltage line V- of the test probe 41 on the negative side of the battery under test 6 are connected to the channel switching module 55. On the V- and I- terminals, the shielding wires of the current and voltage lines are connected to the PB (shielded wire) terminal of the channel switching module 55. The voltage line V+ of the test probe 41 on the positive side of the battery under test 6 is connected to the V+ terminal of the channel switching module 55, and the current line I+ is connected to the bolt hole on the positive side of the metal cover 51. One end of the current line I- is connected to the bolt hole on the negative side of the metal cover 51, and the other end is connected to the I- terminal of the channel switching module 55. The current lines I- and I+ are twisted together and distributed on the negative side, which can reduce the AC loop area and thus achieve the stability of the AC internal resistance value test. When the battery under test 6 is sent into the equipment test position by the conveying assembly 2 along with the tray, the positioning and scanning are performed. The test assembly 4 starts to move, so that the test probes 41 on the left and right sides simultaneously contact the positive and negative terminals of the battery under test 6. Then, the lifting cylinder 53 of the metal cover assembly 5 descends, and the guide rod is used to straighten the battery under test 6. At the same time, the metal cover 51 covers the battery under test 6, and the OCV test begins. The host computer sends a channel switching command to the PCB board 54, and the channel switching module 55 switches each channel in sequence. The voltmeter and internal resistance meter can then read the AC internal resistance value and DC voltage value of the battery under test 6 in the corresponding channel, thereby realizing automated OCV testing of the blade battery.

Claims

1. A dual sided post battery OCV test apparatus comprising a rack assembly (1) characterised in that: The rack assembly (1) is provided with a conveying assembly (2) for conveying the battery to be tested (6), the bottom of the conveying assembly (2) is provided with a jacking assembly (3), the two sides of the conveying assembly (2) are provided with a test assembly (4), the jacking assembly (3) is used for jacking the battery to be tested (6) to the test station of the test assembly (4), the top of the jacking assembly (3) is provided with a metal cover assembly (5), the metal cover assembly (5) comprises a metal cover (51) and a channel switching module (55), the channel switching module (55) is provided with V+ terminal, V- terminal, I+ terminal, I- terminal and PB terminal The metal cover (51) covers the outside of the battery to be tested 6 during testing, and the metal cover 51 is added for each channel of the battery to be tested 6; The test assembly (4) comprises two groups of test probes (41), and the two groups of test probes (41) correspond to the positive and negative electrodes of the two ends of the battery to be tested (6) respectively; The positive current line I+ of the channel switching module (55) is connected to the bolt hole at one end of the metal cover (51), and the bolt hole at the other end of the metal cover (51) is connected to the test probe (41) I+ on the positive side. The current lines I+ and I- of the switching module (55) are distributed on the negative side of the battery to be tested (6) and are twisted together.

2. The OCV test equipment for double-sided pole battery of claim 1, wherein: The metal cover assembly (5) further comprises a guide rod (52), the guide rod (52) is arranged outside the metal cover (51), and the metal cover (51) and the guide rod (52) are driven to lift by a lifting cylinder (53). The metal cover assembly (5) further comprises a PCB board (54).

3. The OCV test equipment for double-sided pole battery of claim 1, wherein: The test probe (41) is driven to move laterally by a transverse movement cylinder.

4. The OCV test equipment for double-sided pole battery of claim 2, wherein: The metal cover (51) is a stainless steel component, and the inner side and the outer side of the metal cover (51) are attached with Teflon corrosion-resistant insulating tape.

5. The OCV test equipment for double-sided pole battery of claim 1, wherein: The test probe (41) adopts an L-shaped wide pole probe module, and the current line and the voltage line of the test probe (41) adopt a twisted shielded wire.

6. The method of making test connections for a dual-sided post battery OCV test apparatus of claim 1, wherein: The positive and negative side current lines and voltage lines of the battery to be tested (6) are respectively connected to the voltage and current positive and negative terminals of the channel switching module (55), the shielding layers on the V+, V-, I+ and I- lines are connected to the PB terminal of the channel switching module (55), the positive terminal voltage line V+ of each channel of the battery to be tested (6) is distributed on the positive side of the battery to be tested (6), the current line I+ is distributed on the negative terminal of the battery to be tested (6), and the voltage line V- and the I- of the negative terminal of the battery to be tested (6) are distributed on the negative side of the battery to be tested (6).

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