Pouch cell acupuncture test mechanism

Abstract

The utility model provides a pouch cell acupuncture test mechanism, including first clamping plate, second clamping plate, distance measuring sensor, extrusion head and pricking needle, first clamping plate and second clamping plate are arranged oppositely, and pouch cell is clamped between first clamping plate and second clamping plate during test, the first clamping plate is provided with a test hole, and the second clamping plate is provided with a second test hole. The test hole can expose the surface of the soft package battery; the extrusion head is arranged on one side of the test hole, the pricking pin is installed on the extrusion head and right faces the test hole, a plurality of distance measuring sensors are arranged on the extrusion head on the periphery of the pricking pin in the circumferential direction, and the distance measuring sensors measure the distance between the distance measuring sensors and the surface of the first clamping plate. The needling testing mechanism adopts the non-contact distance measuring sensor to assist in measuring the distance between the needling testing mechanism and the surface of the first clamping plate, the initial position is directly determined, idle running is not needed, and the testing time is saved; the distance from the pricking needle to the surface of the battery cell can be measured in real time and accurately output, and the pricking speed, the pricking accuracy and the repeated positioning precision of the pricking needle can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of soft-pack battery testing, in particular to a soft-pack battery puncture testing mechanism. Background Art

[0002] Lithium-ion batteries have been widely used in various portable electronic products due to their high energy and power density, as well as long cycle life. They are also gradually being used in new energy vehicles and various forms of energy storage base stations. With the increasing energy density of lithium-ion batteries and their increasing popularity in various application terminals, the risk of failure and the damage caused by failure are becoming more and more serious.

[0003] For the above reasons, lithium-ion battery manufacturers need to conduct random inspections of safety performance during the development process, type testing, and factory inspection, among which the puncture test is a very important one; relevant domestic and international testing standards such as GB / T 31485:2015, SAE J2464:2009, SAND2005-3123, AIS-048:2009, PV8450:2018, IEC 62660-4, etc., also include requirements for puncture tests.

[0004] In the prior art, for example, a utility model patent with authorization announcement number CN219039313U and titled "A high-precision acupuncture test device for lithium-ion batteries based on electrical signals" discloses a solution for positioning the initial position of acupuncture using electrical signals. However, in this solution, when positioning the initial position, the acupuncture device still needs to run once in an idle stroke at a slower speed to capture the position where the needle contacts the surface of the battery cell, which is transmitted to the acupuncture device in the form of an electrical signal. This is used as the 0 scale point, and the penetration depth is calculated again. In addition, this solution still requires the needle to contact the surface of the battery cell, and there is still a penetration depth, so there is still a problem of inaccurate needle distance. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in order to overcome the shortcomings of the prior art acupuncture equipment that runs once in an empty stroke and has an inaccurate acupuncture distance when performing initial position positioning, the utility model provides a soft-pack battery acupuncture test mechanism.

[0006] The technical solution to be adopted by the utility model to solve its technical problems is: a soft-pack battery puncture test mechanism, including a first clamping plate, a second clamping plate, a distance sensor, an extrusion head and a puncture needle, the first clamping plate and the second clamping plate are arranged opposite to each other, and the soft-pack battery is clamped between the first clamping plate and the second clamping plate during testing, the first clamping plate is provided with a test hole, and the test hole can expose the surface of the soft-pack battery; the extrusion head is arranged on one side of the test hole, and the puncture needle is installed on the extrusion head and is opposite to the test hole, and the length of the puncture needle is greater than the depth of the test hole to ensure that the puncture needle can puncture the soft-pack battery; a plurality of distance sensors are arranged on the extrusion head outside the puncture needle along the circumferential direction, and the distance sensor measures the distance from the extrusion head to the surface of the first clamping plate.

[0007] Furthermore, the distance measuring sensor adopts an infrared distance measuring sensor or a laser distance measuring sensor, and at least a reflective coating is provided on the surface of the first clamping plate on the side opposite to the distance measuring sensor, so as to improve the reflectivity of the light signal to ensure the accuracy of the distance measurement.

[0008] Preferably, there are four ranging sensors, which are evenly distributed along the circumference.

[0009] Furthermore, the opening size of the test hole is 0.5--1.5 cm 2 Preferably, the shape of the test hole is circular or regular polygonal.

[0010] Furthermore, in order to facilitate the installation of the needle and the distance measuring sensor, the extrusion head is cylindrical and has a blind hole at one end. One end of the needle is installed in the blind hole. A plurality of through holes are provided on the extrusion head around the blind hole, and the distance measuring sensors are installed in the through holes one by one.

[0011] Furthermore, in order to fix the needle, an annular groove is provided on the side wall of the blind hole near the opening end, and an elastic retaining ring is embedded in the annular groove. When the tail of the needle is inserted into the blind hole, the elastic retaining ring is embedded in the annular groove to block the needle, play the role of axial positioning, and prevent the needle inside from moving along the axial direction, thereby affecting the actual acupuncture distance.

[0012] Furthermore, in order to facilitate the clamping and replacement of the soft-pack battery, a detachable fastener is also included, and the first clamping plate and the second clamping plate are connected by the detachable fastener.

[0013] Preferably, the detachable fastener comprises a screw, a bolt or a threaded rod.

[0014] The beneficial effects of the utility model are as follows: the utility model provides a soft-pack battery puncture test mechanism, which adopts a non-contact distance measuring sensor to assist in measuring the distance between the puncture needle and the surface of the first clamping plate, directly determines the initial position, does not require idling operation, and saves test time; the distance from the puncture needle to the surface of the battery cell can be measured in real time and accurately output, which can effectively improve the puncture speed, puncture accuracy and puncture repeated positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a structural schematic diagram of a soft-pack battery puncture test mechanism of the utility model.

[0017] Figure 2 It is a structural schematic diagram of a soft-pack battery puncture test mechanism of the utility model.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the soft-pack battery puncture test mechanism of the utility model.

[0019] Figure 4 It is the assembly diagram of the elastic retaining ring.

[0020] Figure 5 It is a schematic diagram of the cross-sectional structure of the extrusion head.

[0021] In the figure: 1. first clamping plate, 2. second clamping plate, 3. distance measuring sensor, 4. extrusion head, 4.1. blind hole, 4.2. through hole, 4.3. annular groove, 5. puncture needle, 6. screw, 7. soft pack battery, 8. test hole, 9. elastic retaining ring. DETAILED DESCRIPTION

[0022] The present invention is now described in further detail in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the subject matter for which protection is sought is limited only by the attached claims and their equivalents.

[0023] like Figure 1-Figure 5As shown, a soft-pack battery 7 puncture test mechanism of the utility model includes a first clamping plate 1, a second clamping plate 2, a distance sensor 3, an extrusion head 4 and a puncture needle 5. The first clamping plate 1 and the second clamping plate 2 are arranged opposite to each other, and the soft-pack battery 7 is clamped between the first clamping plate 1 and the second clamping plate 2 during the test. The first clamping plate 1 and the second clamping plate 2 are fixed by detachable fasteners, and the fasteners include but are not limited to screws 6, bolts or screws. In this embodiment, the first clamping plate 1 and the second clamping plate 2 are rectangular, so four screws 6 are used to fasten them at the four corners. A test hole 8 is provided on the first clamping plate 1, and the test hole 8 can expose the surface of the soft-pack battery 7. The opening size of the test hole 8 is 0.5--1.5cm 2 Preferably, the shape of the test hole 8 is circular or regular polygonal. In this embodiment, a circular hole with a diameter of 1 cm is provided. The extrusion head 4 is arranged on one side of the test hole 8. The extrusion head 4 may be a cylinder or a prism. Figure 5 As shown, in this embodiment, the extrusion head 4 is cylindrical, with a blind hole 4.1 at one end. One end of the puncture needle 5 is installed in the blind hole 4.1 of the extrusion head 4 and faces the test hole 8. In this embodiment, the puncture needle 5 faces the center of the test hole 8. The length of the puncture needle 5 is greater than the depth of the test hole 8 to ensure that the puncture needle 5 can pierce the soft-pack battery 7. In order to fix the puncture needle 5, an annular groove 4.3 is provided on the side wall of the blind hole 4.1 near the opening end, and an elastic retaining ring 9 is embedded in the annular groove 4.3. When the tail of the puncture needle 5 is inserted into the blind hole 4.1, the elastic retaining ring 9 is embedded in the annular groove 4.3 to block the puncture needle 5, which plays a role in axial positioning and prevents the puncture needle 5 inside from moving along the axial direction, thereby affecting the actual acupuncture distance. A plurality of through holes 4.2 for installing the distance measuring sensors 3 are provided on the extrusion head 4 around the blind hole 4.1. A plurality of distance measuring sensors 3 are provided along the circumferential direction on the extrusion head 4 outside the needle 5. The distance measuring sensors 3 are installed in the through holes 4.2 one by one. The distance measuring sensors 3 measure the distance from the surface of the first clamping plate 1. Preferably, the distance measuring sensors 3 are infrared distance measuring sensors 3 or laser distance measuring sensors 3. In order to ensure the accuracy of the measurement, at least a reflective coating is provided on the surface of the first clamping plate 1 on the side opposite to the distance measuring sensor 3, so as to improve the reflectivity of the light signal and ensure the accuracy of the distance measurement. Preferably, there are four distance measuring sensors 3, which are evenly distributed along the circumferential direction.

[0024] Working principle:

[0025] In the acupuncture mechanism, the extrusion head 4, the needle 5, the elastic retaining ring 9 and the distance sensor 3 together constitute the acupuncture execution component, and the first clamping plate 1, the second clamping plate 2 and the detachable fastener together constitute the fixture for sample testing.

[0026] During assembly, the needle 5 is inserted into the blind hole 4.1 of the extrusion head 4, and the end is axially positioned by the elastic retaining ring 9 embedded in the annular groove 4.3; four distance sensors 3 are installed in the four through holes 4.2 of the extrusion head 4; the acupuncture execution assembly is assembled and installed on the execution end of the acupuncture device. Then, the soft-pack battery 7 to be tested is clamped between the first clamping plate 1 and the second clamping plate 2, and the four corners are locked by screws 6. The assembly of the complete fixture is completed, and the fixture holding the soft-pack battery 7 is installed on the test bench of the acupuncture device.

[0027] Then, the test is started, and the distance sensor 3 measures the distance H to the surface of the first clamping plate 1 in real time, and sends the distance data to the control end of the acupuncture device, thereby controlling the actuator to drive the puncture needle 5 to move toward the soft-pack battery 7 to perform the acupuncture test.

[0028] Multiple distance data are collected by using multiple distance measuring sensors 3, and the average value is used as the distance of the initial position, so as to further reduce the assembly error. When calculating the distance, it should be noted that the data measured by the distance measuring sensor 3 is not the distance from the needle 5 to the surface of the soft-pack battery 7. When calculating, the length h1 of the needle 5 extending from the end face of the extrusion head 4 and the thickness h2 of the first clamping plate 1 should be taken into account, which will not be described in detail here.

[0029] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the scope of the utility model through the above description. The technical scope of this utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A soft pack battery puncture test mechanism, characterized in that: The invention comprises a first clamping plate, a second clamping plate, a distance measuring sensor, an extrusion head and a pricking needle. The first clamping plate and the second clamping plate are arranged opposite to each other, and the soft-pack battery is clamped between the first clamping plate and the second clamping plate during testing. A test hole is arranged on the first clamping plate, and the test hole can expose the surface of the soft-pack battery. The extrusion head is arranged on one side of the test hole, and the pricking needle is installed on the extrusion head and is opposite to the test hole. The length of the pricking needle is greater than the depth of the test hole. A plurality of distance measuring sensors are arranged on the extrusion head outside the pricking needle along the circumferential direction, and the distance measuring sensor measures the distance from the extrusion head to the surface of the first clamping plate.

2. The soft pack battery puncture test mechanism according to claim 1, characterized in that: The distance measuring sensor is an infrared distance measuring sensor or a laser distance measuring sensor, and at least a surface of the first clamping plate on a side opposite to the distance measuring sensor is provided with a reflective coating.

3. The soft pack battery puncture tester according to claim 1, characterized in that: There are four distance measuring sensors, which are evenly distributed along the circumference.

4. The soft pack battery puncture test mechanism according to claim 1, characterized in that: The opening size of the test hole is 0.5--1.5cm 2 .

5. The soft pack battery puncture tester according to claim 1, characterized in that: The extrusion head is cylindrical, with a blind hole at one end, one end of the needle is installed in the blind hole, and a plurality of through holes are opened on the extrusion head around the blind hole, and the distance measuring sensors are installed in the through holes one by one.

6. The soft pack battery puncture test mechanism according to claim 5, characterized in that: An annular groove is arranged on the side wall of the blind hole close to one end of the opening, and an elastic retaining ring is embedded in the annular groove.

7. The soft pack battery puncture test mechanism according to claim 1, characterized in that: It also includes a detachable fastener, and the first clamping plate and the second clamping plate are connected by the detachable fastener.

8. The soft pack battery puncture test mechanism according to claim 7, characterized in that: The removable fasteners include screws, bolts or threaded rods.

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