A soft pack battery cell edge voltage test device

Abstract

A soft-pack battery cell edge voltage test device comprises a detection platform and a conveyor belt movably arranged on the detection platform, a plurality of battery cells for transmission are placed on the conveyor belt, an aluminum-plastic film and a positive electrode are arranged on the battery cells, a plurality of detection mechanisms for simultaneously detecting the edge voltages of the plurality of battery cells are arranged on the detection platform, a double-axis cylinder for driving the plurality of detection mechanisms to rise and fall synchronously is installed on the detection platform, and a buffer assembly for buffering the rise and fall of the detection mechanisms is arranged on the detection mechanisms; compared with the prior art, the device realizes simultaneous detection of a plurality of battery cells, thereby improving the detection efficiency, and in addition, by connecting a second detection probe in a conductive foam, at the junction of the conductive foam and the aluminum-plastic film, the contact area is increased, poor contact is avoided, and the detection accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, and in particular to a soft-pack battery core edge voltage testing device. Background Art

[0002] Soft-pack lithium batteries are just liquid lithium-ion batteries covered with a polymer shell, and are structurally packaged in aluminum-plastic film. Lithium batteries are devices that convert chemical energy into electrical energy, and have positive and negative electrodes. As batteries are increasingly needed by people, using batteries as a source of energy is easy to carry and simple, and plays a big role in all aspects of modern social life.

[0003] During the production and processing of soft-pack lithium batteries, improper operation may cause conduction between the packaging film (aluminum-plastic film) and the tabs of the soft-pack lithium batteries, resulting in a short circuit and causing corrosion of the aluminum foil, damage to the internal PP film layer, electrolyte leakage and even battery cell explosion, leading to major hidden dangers in the use and production of the battery cells.

[0004] To solve the above problems, Chinese patent application number 201721237246.6 discloses a device for testing the edge voltage of a soft-pack lithium battery. The device disclosed above includes a tester and a measuring instrument; the tester includes a voltage tester, a conductive sheet and a conductive wire, the conductive sheet includes a first end and a second end, the first end of the conductive sheet is electrically connected to the voltage tester, and the second end of the conductive sheet is against the top sealing edge of the aluminum-plastic film in the soft-pack lithium battery to be tested; the conductive wire includes a first end and a second end, the first end of the conductive wire is electrically connected to the voltage tester, and the second end of the conductive wire is electrically connected to the pole ear of the soft-pack lithium battery to be tested; the voltage tester tests the voltage value between the top sealing edge and the pole ear; the measuring instrument is used to measure the relative distance between the second end of the conductive sheet and the top sealing edge of the aluminum-plastic film of the soft-pack lithium battery to be tested. A Chinese patent with application number 202220212961.9 discloses a side voltage testing device for a soft-pack battery. The above-disclosed testing device includes a base, a clamping mechanism and a detection mechanism. A support platform is installed on the upper end surface of the base, a groove is provided on the support platform, a through groove is provided in the base, the clamping mechanism is installed on the base, and the detection mechanism is installed on the upper end surface of the base for detecting the side voltage of the soft-pack battery.

[0005] In the above-mentioned prior art, when detecting the side voltage of the battery cell, only one battery cell can be detected at a time, batch detection cannot be achieved, and the detection efficiency is low. At the same time, when detecting the side voltage of the battery cell, the contact area between the detection end and the battery cell is small, which is prone to poor contact, thereby easily affecting the detection result. Utility Model Content

[0006] The utility model aims to overcome the defects in the prior art and provide a soft-pack battery cell edge voltage testing device with high detection efficiency and accurate detection results.

[0007] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical scheme: a soft-pack battery cell edge voltage test device, including a detection table and a conveyor belt movably arranged on the detection table, a plurality of battery cells for transmission through the conveyor belt are placed on the conveyor belt, an aluminum-plastic film and a positive electrode are arranged on the battery cells, the detection table is provided with a plurality of detection mechanisms for simultaneously detecting the edge voltages of a plurality of battery cells, a double-axis cylinder for driving a plurality of detection mechanisms to rise and fall synchronously is installed on the detection table, a buffer assembly for buffering the rise and fall of the detection mechanism is provided on the detection mechanism; the detection mechanism includes a first detection probe arranged corresponding to the positive electrode and a second detection probe arranged corresponding to the aluminum-plastic film, and the second detection probe is connected to a conductive foam for increasing the contact area with the aluminum-plastic film; the detection table is also provided with testers corresponding to the plurality of detection mechanisms one by one.

[0008] As a preferred solution of the utility model, a mounting frame is provided on the detection platform, a double-axis cylinder is arranged on the mounting frame, and a lifting frame is connected to the output end of the double-axis cylinder, and a plurality of buffer components are arranged on the bottom surface of the lifting frame.

[0009] As a preferred solution of the utility model, the detection mechanism also includes a lifting plate for installing the second detection probe and the conductive foam, the conductive foam is arranged at the bottom of the lifting plate, and the second detection probe passes through the lifting plate and is connected to the conductive foam.

[0010] As a preferred solution of the utility model, the aluminum-plastic film is laid on the surface of the battery core, the conductive foam is arranged corresponding to the aluminum-plastic film, and the second detection probe is connected to the aluminum-plastic film through the conductive foam.

[0011] As a preferred solution of the utility model, a plurality of the lifting plates are provided with connecting pieces, a mounting plate for mounting the first detection probe is connected to the connecting pieces, and the mounting plate is lifted and lowered synchronously with the lifting plate.

[0012] As a preferred solution of the utility model, the distance between the first detection probe and the positive electrode is the same as the distance between the conductive foam and the aluminum-plastic film.

[0013] As a preferred solution of the utility model, the buffer assembly includes a connecting rod connected to the lifting frame and a buffer rod connected to the lifting plate, and a sliding groove arranged along the axial direction of the connecting rod is formed at the bottom of the connecting rod, and the buffer rod is slidably connected in the sliding groove.

[0014] As a preferred solution of the utility model, a buffer spring is arranged in the slide groove, and two ends of the buffer spring abut against the bottom of the slide groove and the top of the buffer rod respectively.

[0015] As a preferred solution of the utility model, a limiting ring protruding inwardly along the radial direction of the connecting rod is provided at the opening of the slide groove, and an anti-slip ring protruding outwardly along the radial direction of the buffer rod is provided at the top end of the buffer rod, and the anti-slip ring abuts against the limiting ring.

[0016] As a preferred solution of the present invention, the first detection probe and the second detection probe of each detection mechanism are electrically connected to the corresponding tester.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] A plurality of battery cells are transported to the testing platform by a conveyor belt, and a plurality of testing mechanisms are driven to rise and fall synchronously under the control of a dual-axis cylinder. When a plurality of testing mechanisms descend to the battery cells and abut against the battery cells, a plurality of battery cells can be tested simultaneously, thereby improving the testing efficiency. In addition, by connecting the second testing probe to the conductive foam and the junction of the conductive foam and the aluminum-plastic film, the contact area is increased, thereby avoiding poor contact and improving the testing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the detection mechanism of the utility model;

[0021] Figure 3 This is a cross-sectional view of the buffer component of the utility model

[0022] Figure numerals: testing table 1, mounting frame 101, conveyor belt 2, battery cell 3, aluminum-plastic film 301, positive electrode 302, testing mechanism 4, first testing probe 401, mounting plate 4011, connecting piece 4012, second testing probe 402, lifting plate 403, conductive foam 404, dual-axis cylinder 5, tester 6, lifting frame 7, buffer assembly 8, connecting rod 801, slide groove 8011, limiting ring 8012, buffer spring 802, buffer rod 803, anti-slip ring 8031. DETAILED DESCRIPTION

[0023] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0024] like Figure 1-Figure 3As shown, a soft-pack battery cell side voltage test device comprises a detection table 1 and a conveyor belt 2 movably arranged on the detection table 1, a plurality of battery cells 3 for transmission by the conveyor belt 2 are placed on the conveyor belt 2, an aluminum-plastic film 301 and a positive electrode 302 are arranged on the battery cells 3, a plurality of detection mechanisms 4 for simultaneously detecting the side voltages of the plurality of battery cells 3 are arranged on the detection table 1, a double-axis cylinder 5 for driving the plurality of detection mechanisms 4 to rise and fall synchronously is installed on the detection table 1, a buffer assembly 8 for buffering the rising and falling of the detection mechanism 4 is arranged on the detection mechanism 4; the detection mechanism 4 comprises a first detection probe 401 arranged corresponding to the positive electrode 302 and a second detection probe 402 arranged corresponding to the aluminum-plastic film 301, and the second detection probe 402 is connected with a conductive foam 404 for increasing the contact area with the aluminum-plastic film 301; the detection table 1 is also provided with a tester 6 corresponding to the plurality of detection mechanisms 4 one by one.

[0025] Furthermore, the conveyor belt 2 moves along the length direction of the detection table 1, and a number of battery cells 3 are placed equidistantly on the conveyor belt 2. The battery cells 3 are transported to the bottom of the detection mechanism 4 through the conveyor belt 2. The dual-axis cylinder 5 drives the multiple detection mechanisms 4 to move downward synchronously. When the detection mechanism 4 abuts against the battery cells 3, the first detection probe 401 abuts against the positive electrode 302, and the second detection probe 402 abuts against the aluminum-plastic film 301, thereby realizing batch detection of the battery cells 3 and improving the detection efficiency.

[0026] In addition, when the detection mechanism 4 abuts against the battery core 3, the first detection probe and the second detection probe are buffered by the buffer assembly 8 arranged on the detection mechanism 4, ensuring that the aluminum-plastic film and the positive electrode will not be damaged.

[0027] A mounting frame 101 is provided on the detection table 1, and a double-axis cylinder 5 is arranged on the mounting frame 101, and a lifting frame 7 is connected to the output end of the double-axis cylinder 5, and a plurality of buffer components 8 are arranged on the bottom surface of the lifting frame 7. Furthermore, a detection mechanism 4 is arranged at the lower end of the buffer component 8, and a plurality of buffer components 8 are fixedly arranged on the lower surface of the lifting frame 7. The plurality of detection mechanisms 4 are connected through the lifting frame 7, and under the action of the double-axis cylinder 5, the plurality of detection mechanisms 4 are lifted and lowered synchronously.

[0028] The detection mechanism 4 also includes a lifting plate 403 for installing a second detection probe 402 and a conductive foam 404. The conductive foam 404 is arranged at the bottom of the lifting plate 403. The second detection probe 402 passes through the lifting plate 403 and is connected to the conductive foam 404. Further, the lifting plate 403 is connected to the buffer component 8, and the conductive foam 404 is fixedly arranged at the bottom of the lifting plate 403. The aluminum-plastic film 301 is laid on the surface of the battery cell 3, and the conductive foam 404 is arranged corresponding to the aluminum-plastic film 301. The second detection probe 402 is connected to the aluminum-plastic film 301 through the conductive foam 404. At the junction of the conductive foam 404 and the aluminum-plastic film 301 of the battery cell 3, the contact area between the second detection probe 402 and the aluminum-plastic film 301 is increased under the action of the conductive foam 404, thereby ensuring the accuracy of the detection. In addition, the lifting plate 403 is made of insulating material.

[0029] Several lifting plates 403 are provided with connecting pieces 4012, and the connecting pieces 4012 are connected with a mounting plate 4011 for mounting the first detection probe 401, and the mounting plate 4011 and the lifting plate 403 are lifted and lowered synchronously. Furthermore, the mounting plate 4011 is arranged along the length direction of the detection platform 1, and several first detection probes 401 are mounted on the mounting plate 4011. Each lifting plate 403 is provided with a connecting piece 4012, and is connected to the mounting plate 4011 through several connecting pieces 4012, so that the mounting plate 4011 and the lifting plate 403 are lifted and lowered synchronously, ensuring that the first detection probe 401 and the second detection probe 402 simultaneously detect the positive electrode 302 and the aluminum-plastic film 301 of the battery cell.

[0030] The distance between the first detection probe 401 and the positive electrode 302 is the same as the distance between the conductive foam 404 and the aluminum-plastic film 301, ensuring that the first detection probe 401 and the conductive foam 404 can contact the positive electrode 302 and the aluminum-plastic film 301 of the battery cell 3 respectively and simultaneously, thereby ensuring the detection effect.

[0031] The buffer assembly 8 includes a connecting rod 801 connected to the lifting frame 7 and a buffer rod 803 connected to the lifting plate 403. A sliding groove 8011 is formed at the bottom of the connecting rod 801 and is arranged along the axial direction of the connecting rod 801. The buffer rod 803 is slidably connected in the sliding groove 8011. Furthermore, the connecting rod 801 and the buffer rod 803 are coaxially arranged, and the connecting rod 801 is slidably connected to the buffer rod 803. The top end of the buffer rod 803 is arranged in the sliding groove 8011 at the bottom of the connecting rod 801.

[0032] Furthermore, a buffer spring 802 is provided in the slide groove 8011, and the two ends of the buffer spring 802 are respectively abutted against the bottom of the slide groove 8011 and the top of the buffer rod 803. The buffer spring 802 is used to buffer the moving distance of the buffer rod 803 in the slide groove 8011, thereby achieving a buffering effect on the detection mechanism 4.

[0033] A limiting ring 8012 protruding inwardly along the radial direction of the connecting rod 801 is provided at the opening of the slide groove 8011, and an anti-slip ring 8031 ​​protruding outwardly along the radial direction of the buffer rod 803 is provided at the top end of the buffer rod 803, and the anti-slip ring 8031 ​​abuts against the limiting ring 8012. Furthermore, the limiting ring 8012 is arranged at the bottom end of the connecting rod 801, and the anti-slip ring 8031 ​​is arranged at the top end of the buffer rod 803, and the anti-slip ring 8031 ​​slides in the slide groove 8011. When the buffer rod 803 slides to the outside of the slide groove 8011, the anti-slip ring 8031 ​​abuts against the limiting ring 8012, thereby preventing the buffer rod 803 from detaching from the slide groove 8011.

[0034] The first detection probe 401 and the second detection probe 402 of each detection mechanism 4 are electrically connected to the corresponding tester 6 , and the reading of the tester 6 is used to determine whether the edge voltage meets the requirement.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0036] Although this article uses more of the following terms: test bench 1, mounting frame 101, conveyor belt 2, battery cell 3, aluminum plastic film 301, positive electrode 302, test mechanism 4, first test probe 401, mounting plate 4011, connector 4012, second test probe 402, lifting plate 403, conductive foam 404, double-axis cylinder 5, tester 6, lifting frame 7, buffer assembly 8, connecting rod 801, slide 8011, limit ring 8012, buffer spring 802, buffer rod 803, anti-slip ring 8031, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A soft-pack battery cell edge voltage test device, comprising a test bench (1) and a conveyor belt (2) movably arranged on the test bench (1), a plurality of battery cells (3) are placed on the conveyor belt (2) for transmission through the conveyor belt (2), and an aluminum-plastic film (301) and a positive electrode (302) are arranged on the battery cell (3), characterized in that: The detection platform (1) is provided with a plurality of detection mechanisms (4) for simultaneously detecting the voltages of a plurality of battery cells (3); a double-axis cylinder (5) for driving the plurality of detection mechanisms (4) to rise and fall synchronously is installed on the detection platform (1); a buffer assembly (8) for buffering the rise and fall of the detection mechanism (4) is provided on the detection mechanism (4); the detection mechanism (4) comprises a first detection probe (401) arranged corresponding to the positive electrode (302) and a second detection probe (402) arranged corresponding to the aluminum-plastic film (301); and the second detection probe (402) is connected with a conductive foam (404) for increasing the contact area with the aluminum-plastic film (301); and the detection platform (1) is also provided with a tester (6) corresponding to the plurality of detection mechanisms (4) one by one.

2. A soft-pack battery cell edge voltage test device according to claim 1, characterized in that: The detection platform (1) is provided with a mounting frame (101), a double-axis cylinder (5) is arranged on the mounting frame (101), and a lifting frame (7) is connected to the output end of the double-axis cylinder (5), and a plurality of buffer components (8) are arranged on the bottom surface of the lifting frame (7).

3. A soft-pack battery cell edge voltage test device according to claim 2, characterized in that: The detection mechanism (4) further comprises a lifting plate (403) for mounting a second detection probe (402) and a conductive foam (404); the conductive foam (404) is arranged at the bottom of the lifting plate (403); and the second detection probe (402) passes through the lifting plate (403) and is connected to the conductive foam (404).

4. A soft-pack battery cell edge voltage test device according to claim 1, characterized in that: The aluminum-plastic film (301) is laid on the surface of the battery core (3), the conductive foam (404) is arranged corresponding to the aluminum-plastic film (301), and the second detection probe (402) is connected to the aluminum-plastic film (301) through the conductive foam (404).

5. A soft-pack battery cell edge voltage test device according to claim 3, characterized in that: A plurality of the lifting plates (403) are provided with connecting pieces (4012), and a mounting plate (4011) for mounting the first detection probe (401) is connected to the connecting piece (4012), and the mounting plate (4011) and the lifting plate (403) are lifted and lowered synchronously.

6. A soft-pack battery cell edge voltage test device according to claim 1, characterized in that: The distance between the first detection probe (401) and the positive electrode (302) is the same as the distance between the conductive foam (404) and the aluminum-plastic film (301).

7. A soft-pack battery cell edge voltage test device according to claim 3, characterized in that: The buffer assembly (8) comprises a connecting rod (801) connected to the lifting frame (7) and a buffer rod (803) connected to the lifting plate (403); a sliding groove (8011) arranged along the axial direction of the connecting rod (801) is formed at the bottom of the connecting rod (801); the buffer rod (803) is slidably connected in the sliding groove (8011).

8. A soft-pack battery cell edge voltage test device according to claim 7, characterized in that: A buffer spring (802) is arranged in the slide groove (8011), and two ends of the buffer spring (802) are respectively abutted against the bottom of the slide groove (8011) and the top of the buffer rod (803).

9. A soft-pack battery cell edge voltage test device according to claim 7, characterized in that: A limiting ring (8012) protruding inwardly along the radial direction of the connecting rod (801) is provided at the opening of the slide groove (8011), and an anti-slip ring (8031) protruding outwardly along the radial direction of the buffer rod (803) is provided at the top end of the buffer rod (803), and the anti-slip ring (8031) abuts against the limiting ring (8012).

10. A soft-pack battery cell edge voltage test device according to claim 1, characterized in that: The first detection probe (401) and the second detection probe (402) of each detection mechanism (4) are electrically connected to the corresponding tester (6).

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