阅读说明：本技术 一种测试方形铝壳电池单侧膨胀厚度的装置及测试方法 (Device and method for testing unilateral expansion thickness of square aluminum-shell battery ) 是由 王增森 王化胜 余峰 葛科 于 2021-08-30 设计创作，主要内容包括：本发明涉及一种测试方形铝壳电池单侧膨胀厚度的装置及测试方法,属于新能源锂电池的技术领域。它包括底座,所述底座上设置有电芯腾空支撑结构,所述底座一侧还设置有直立柱,所述直立柱与底座转动连接；所述直立柱上设置有环状的连接件,所述连接件一侧与旋转平台连接；所述旋转平台上设置有多个探针安装槽,每个探针安装槽内均设置有探针本体,位于中心位置的探针本体底部设置有探针帽；所述探针安装槽上设置有读数口,并在读数口下方插入设置旋紧开关。本发明具有针对性地设计了测试方形铝壳电池单侧膨胀厚度的装置及其测试方法,能够直观量化电芯的单面膨胀厚度。(The invention relates to a device and a method for testing the unilateral expansion thickness of a square aluminum shell battery, and belongs to the technical field of new energy lithium batteries. The battery cell emptying support structure comprises a base, wherein a battery cell emptying support structure is arranged on the base, and an upright post is also arranged on one side of the base and is rotatably connected with the base; an annular connecting piece is arranged on the upright column, and one side of the connecting piece is connected with the rotating platform; the rotary platform is provided with a plurality of probe installation grooves, a probe body is arranged in each probe installation groove, and a probe cap is arranged at the bottom of the probe body in the central position; and a reading port is arranged on the probe mounting groove, and a screwing switch is inserted and arranged below the reading port. The device and the method for testing the unilateral expansion thickness of the square aluminum shell battery are designed in a targeted manner, and the unilateral expansion thickness of the battery core can be directly quantified.)

1. The utility model provides a test square aluminum hull battery unilateral inflation thickness's device which characterized in that: the battery cell emptying device comprises a base (1), wherein a battery cell emptying supporting structure (2) is arranged on the base (1), an upright column (3) is further arranged on one side of the base (1), and the upright column (3) is rotatably connected with the base (1);

the upright post (3) is provided with an annular connecting piece (4), and the other side of the connecting piece (4) is connected with a rotating platform (5);

a plurality of probe installation grooves (6) are formed in the rotary platform (5), a probe body (9) is arranged in each probe installation groove (6), and a probe cap (10) is arranged at the bottom of the probe body (9) in the central position;

a reading port (7) is arranged on the probe mounting groove (6), and a screwing switch (8) is inserted and arranged below the reading port (7).

2. The apparatus of claim 1, wherein the apparatus comprises: the cell emptying support structure (2) comprises a first support column (2.1), a second support column (2.2), a third support column (2.3) and a fourth support column (2.4);

the first supporting column (2.1), the second supporting column (2.2), the third supporting column (2.3) and the fourth supporting column (2.4) are arranged at four corners of the cell body (11), and rectangular grooves are formed in a structure matched with the cell body (11);

the bottom of first support column (2.1), second support column (2.2), third support column (2.3) and fourth support column (2.4) all is provided with collet (2.5), collet (2.5) are bottom boss structure, form the four corners to electric core body (11) and support.

3. The apparatus of claim 1, wherein the apparatus comprises: the structure of the rotary platform (5) is matched with the bottom surface structure of the base (1).

4. The apparatus of claim 1, wherein the apparatus comprises: the probe body (9) comprises a measuring end (9.1) and a reading end (9.2);

the measuring end (9.1) and the reading end (9.2) are both arranged in a cylinder structure and are arranged coaxially;

the structural diameter of the reading end (9.2) is larger than that of the measuring end (9.1).

5. The apparatus of claim 1, wherein the apparatus comprises: the probe mounting groove (6) comprises four-corner probe mounting grooves and a central probe mounting groove;

the four-corner probe mounting grooves are distributed at four corners of the rotary platform (5) and are matched with four corners of the electric core body (11);

the central probe mounting groove is arranged at the central position of the rotating platform (5) and matched with the central position of the battery cell body (11).

6. The apparatus for testing the unilateral swelling thickness of the prismatic aluminum-shelled battery according to claim 2, wherein: the height of the bottom support (2.5) is not less than 10 mm.

7. A test method for testing the unilateral expansion thickness of a square aluminum-shell battery is characterized in that:

the method comprises the following steps:

the method comprises the following steps: calibrating the probes, and ensuring that the scale value of the probes is 0 when the lower parts of the probes in the four-corner probe mounting grooves are level with the bottom support (2.5), and ensuring that the scale value of the probes is 0 when the lower parts of the probe caps (10) at the bottoms of the probes in the central probe mounting groove are level with the bottom support (2.5);

step two: the probes in the four-corner probe mounting groove and the central probe mounting groove are pulled upwards, the screwing switch (8) is screwed, and the rotating platform (5) is rotated through the vertical column (3), so that a battery cell can conveniently enter;

step three: the cell body (11) is placed in the cell soaring support structure (2) through the cell, and the cell body (11) is matched with the bottom support (2.5) through the first support column (2.1), the second support column (2.2), the third support column (2.3) and the fourth support column (2.4) to form soaring support;

step four: rotating the rotary platform (5) to the upper part of the cell body (11) through the vertical column (3), sequentially loosening the screwing switches (8) on the probe mounting grooves (6), lowering the probes to the surface of the upper shell of the cell body (11), and screwing the screwing switches (8) again after aligning;

step five: reading the probes in the four-corner probe mounting groove, taking the average value as L1, and reading the probes in the central probe mounting groove as L2;

step six: and obtaining the single-side expansion thickness value of the cell body through the difference between the central probe reading L2 and the four-corner probe reading average value L1.

Technical Field

The invention relates to a device and a method for testing the unilateral expansion thickness of a square aluminum shell battery, and belongs to the technical field of new energy lithium batteries.

Background

In the prior art, a square aluminum-shell battery generally uses metal aluminum as a battery aluminum shell, and because the aluminum material is soft, the internal pressure of the battery is increased in the charging and discharging process and due to gas generation and the like, the thickness of the battery is easy to change, and when the thickness is serious, the battery is easy to bulge, so that the electrical property and the safety performance of the battery are influenced. The thickness control of the battery is particularly important.

At present, the thickness of the battery is measured in laboratories and mass production lines by adopting a manual caliper or a pressurization test.

Manual calipers: the thickness of the battery at the upper part, the middle part, the lower part and the periphery of the battery is measured by a single battery of the digital caliper, the thickness of the periphery of the battery core can only be measured due to the limitation of the length of the measuring end of the caliper, the middle position cannot be measured, the measuring operation is complicated, and the caliper is single-point measurement, so the error is obvious, and the data fluctuation is large.

And (3) pressurizing test: after a certain fixed pressure value is applied to the surface of the battery, the thickness of the battery is obtained through height data feedback. Moreover, the thickness of the battery is measured at present, namely the thickness of the whole battery, and a tool and a method for measuring the single-side bulging thickness of the battery are not available up to now.

Chinese patent with patent publication number CN113108742A discloses a solar cell silicon wafer size detection device, belonging to the technical field of silicon wafer detection. It includes base, shell and fixed plate, still includes: the motor is fixedly connected to the base; the rotating shaft is fixedly connected to the output end of the motor; the workbench is fixedly connected to the top end of the rotating shaft; the air cylinder is fixedly connected to the workbench; the vacuum sucker is detachably connected to the output end of the air cylinder; the placing seat is fixedly connected to the base; the material placing plate is connected to the material placing seat in a sliding mode.

According to the silicon wafer testing device, the vacuum chucks are controlled by the air cylinders at the two ends of the workbench to place a silicon wafer to be tested on the material placing plate, the air cylinder and the vacuum chuck at the other end take out the tested silicon wafer, the silicon wafer is tested while feeding and discharging, the thicknesses of the silicon wafers at different positions can be measured, the labor burden of a user is greatly reduced, and the measuring efficiency is improved; however, the thickness of the whole cell is obtained by placing a silicon wafer to be measured on a material placing plate to measure the thickness of the cell, and the square aluminum-shell cell usually expands on two sides.

Therefore, in order to solve the above-mentioned background problems, it is urgent to develop a device and a method for testing the single-side swelling thickness of a prismatic aluminum-casing battery.

Disclosure of Invention

The invention aims to solve the problems in the background, and provides a device and a method for testing the unilateral expansion thickness of a square aluminum shell battery, which have the advantages of reasonable structure, capability of intuitively quantizing the unilateral expansion thickness of a battery core, simple operation, small human factor and reliable data.

The purpose of the invention is realized as follows: a device for testing the unilateral expansion thickness of a square aluminum-shell battery comprises a base, wherein a battery cell emptying supporting structure is arranged on the base, and an upright post is also arranged on one side of the base and is rotatably connected with the base;

an annular connecting piece is arranged on the upright column, and one side of the connecting piece is connected with the rotating platform;

the rotary platform is provided with a plurality of probe installation grooves, a probe body is arranged in each probe installation groove, and a probe cap is arranged at the bottom of the probe body in the central position;

and a reading port is arranged on the probe mounting groove, and a screwing switch is inserted and arranged below the reading port.

The battery cell emptying support structure comprises a first support column, a second support column, a third support column and a fourth support column;

the first support column, the second support column, the third support column and the fourth support column are arranged at four corners of the cell body, and rectangular grooves are formed in a matching manner with the cell body structure;

the bottom of first support column, second support column, third support column and fourth support column all is provided with the collet, the collet is bottom boss structure, forms the four corners to electric core body and supports.

The structure of the rotary platform is matched with the bottom surface structure of the base.

The probe body comprises a measuring end and a reading end;

the measuring end and the reading end are both arranged in a cylindrical structure and are arranged coaxially;

the structural diameter of the reading end is larger than that of the measuring end.

The probe mounting groove comprises a four-corner probe mounting groove and a central probe mounting groove;

the four-corner probe mounting grooves are distributed at four corners of the rotary platform and are matched with the four corners of the battery cell body;

the central probe mounting groove is arranged at the central position of the rotating platform and matched with the central position of the battery cell body.

The height of the bottom support is not less than 10 mm.

A test method for testing the unilateral expansion thickness of a square aluminum-shell battery comprises the following steps:

the method comprises the following steps: calibrating the probes, and ensuring that the scale value of the probes is 0 when the lower parts of the probes in the four-corner probe mounting grooves are flush with the collet and the scale value of the probes is 0 when the lower parts of the probe caps at the bottoms of the probes in the central probe mounting groove are flush with the collet;

step two: the probes in the four-corner probe mounting groove and the central probe mounting groove are pulled upwards, the screwing switch is screwed, and the rotating platform is rotated through the vertical column, so that the electric core can conveniently enter;

step three: placing the battery cell body into a battery cell emptying support structure, and matching the battery cell body with a bottom support through a first support column, a second support column, a third support column and a fourth support column to form an emptying support;

step four: rotating the rotary platform to the upper part of the battery cell body through the vertical column, sequentially loosening the screwing switches on the probe mounting grooves, putting the probes down to the surface of the upper shell of the battery cell body, and screwing the screwing switches again after aligning;

step five: reading the probes in the four-corner probe mounting groove, taking the average value as L1, and reading the probes in the central probe mounting groove as L2;

step six: and obtaining the single-side expansion thickness value of the cell body through the difference between the central probe reading L2 and the four-corner probe reading average value L1.

Compared with the prior art, the invention has the following advantages:

according to the device and the method for testing the unilateral expansion thickness of the square aluminum-shell battery, the unilateral expansion thickness of the battery core can be visually quantized, the production process capability and the finished product qualification rate of the battery core can be evaluated by evaluating the unilateral expansion thickness, the expansion pressure during Pack module assembly can be effectively evaluated, and the thickness during assembly can be controlled;

meanwhile, the testing device provided by the invention is reasonable in structure, simple to operate, small in human influence factor and reliable in data.

Drawings

Fig. 1 is a schematic view of the overall structure of an apparatus for testing the unilateral swelling thickness of a prismatic aluminum-casing battery according to the present invention.

Fig. 2 is a schematic view of a supporting structure of an apparatus for testing the unilateral swelling thickness of a prismatic aluminum-cased battery according to the present invention.

Fig. 3 is a specific schematic diagram of a probe body of the device for testing the unilateral swelling thickness of the square aluminum-shell battery according to the invention.

Wherein: 1. a base; 2. the battery core soaks the supporting structure; 3. a vertical column; 4. a connecting member; 5. rotating the platform; 6. a probe mounting groove; 7. a reading port; 8. screwing the switch; 9. a probe body; 10. a probe cap; 11. a cell body;

2.1, a first support column; 2.2, a second support column; 2.3, a third support column; 2.4, a fourth support column; 2.5, mounting;

9.1, a measuring end; 9.2, reading end.

Detailed Description

The technical solutions of the present invention will be described in further detail with reference to the drawings and some preferred embodiments, but the present invention is not limited to the following embodiments.

As shown in fig. 1 to 3, the device for testing the unilateral expansion thickness of the square aluminum-shell battery comprises a base 1, wherein a battery cell emptying support structure 2 is arranged on the base 1, a vertical column 3 is further arranged on one side of the base 1, and the vertical column 3 is rotatably connected with the base 1;

the upright column 3 is provided with an annular connecting piece 4, and one side of the connecting piece 4 is connected with a rotating platform 5;

a plurality of probe installation grooves 6 are formed in the rotary platform 5, a probe body 9 is arranged in each probe installation groove 6, and a probe cap 10 is arranged at the bottom of the probe body 9 in the central position;

a reading port 7 is arranged on the probe mounting groove 6, and a screwing switch 8 is inserted and arranged below the reading port 7.

The battery cell emptying support structure 2 comprises a first support column 2.1, a second support column 2.2, a third support column 2.3 and a fourth support column 2.4;

the first support column 2.1, the second support column 2.2, the third support column 2.3 and the fourth support column 2.4 are arranged at four corners of the cell body 11, and rectangular grooves are arranged in a manner of matching with the structure of the cell body 11;

the bottom of first support column 2.1, second support column 2.2, third support column 2.3 and fourth support column 2.4 all is provided with collet 2.5, collet 2.5 is bottom boss structure, forms the four corners to electric core body 11 and supports.

The structure of the rotary platform 5 is matched with the bottom surface structure of the base 1.

The probe body 9 comprises a measuring end 9.1 and a reading end 9.2;

the measuring end 9.1 and the reading end 9.2 are both arranged in a cylinder structure and are arranged coaxially;

the structural diameter of the reading end 9.2 is larger than the structural diameter of the measuring end 9.1.

The probe mounting groove 6 comprises a four-corner probe mounting groove and a central probe mounting groove;

the four-corner probe mounting grooves are distributed at four corners of the rotary platform 5 and are matched with four corners of the battery cell body 11;

the central probe installation groove is arranged at the central position of the rotating platform 5 and matched with the central position of the battery cell body 11.

The height of the bottom support 2.5 is not less than 10mm, and the battery cell is double-sided bulging, so that the bottom balance is ensured not to be affected by bottom bulging.

Example 1

Lithium iron phosphate batteries (housing thickness 47.5mm, length 173mm, height 170 mm) were used: after 3500 weeks of 1C cycle 100% DOD charging and discharging, the battery swelled.

In this example, the following test method was employed:

the method comprises the following steps: calibrating the probes, and ensuring that the scale value of the probes is 0 when the lower parts of the probes in the four-corner probe mounting grooves are flush with the collet 2.5, and ensuring that the scale value of the probes is also 0 when the lower parts of the probe caps 10 at the bottoms of the probes in the central probe mounting groove are flush with the collet 2.5;

step two: the probes in the four-corner probe mounting groove and the central probe mounting groove are pulled upwards by 50mm, the screwing switch 8 is screwed, and the rotating platform 5 is rotated through the vertical column 3, so that a lithium iron phosphate battery can conveniently enter;

step three: placing the cell body 11 through the cell emptying support structure 2, wherein the cell body 11 is matched with the bottom support 2.5 through the first support column 2.1, the second support column 2.2, the third support column 2.3 and the fourth support column 2.4 to form an emptying support;

step four: rotating the rotary platform 5 to the upper part of the cell body 11 through the vertical column 3, sequentially loosening the screwing switches 8 on the probe mounting grooves 6, putting the probes down to the surface of the upper shell of the cell body 11, and screwing the screwing switches 8 after aligning;

step five: respectively recording the readings of the probes in the four-corner probe mounting grooves as A1, A2, A3 and A4, taking the average value as L1, and recording the reading of the probe in the central probe mounting groove as L2;

step six: and obtaining the single-side expansion thickness value of the cell body through the difference between the central probe reading L2 and the four-corner probe reading average value L1.

The test results are shown in Table 1.

TABLE 1 Single-sided measurement data for lithium iron phosphate batteries

The single-side expansion thickness value of the lithium iron phosphate battery is 2.3mm through analysis.

The above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.