CN219039311U

CN219039311U - Lithium ion battery safety performance testing device

Info

Publication number: CN219039311U
Application number: CN202222478161.4U
Authority: CN
Inventors: 赵岩岩; 易爱迪; 刘磊; 杨洪宇; 卫立峰; 刘定宏; �田�浩; 张亚峰; 王冬生; 周宇轩
Original assignee: China Automotive Research Center Changzhou Co ltd
Current assignee: China Automotive Research Center Changzhou Co ltd
Priority date: 2022-09-19
Filing date: 2022-09-19
Publication date: 2023-05-16
Anticipated expiration: 2032-09-19

Abstract

The utility model relates to the technical field related to lithium ion batteries, in particular to a safety performance testing device for the lithium ion batteries, which comprises a testing box body, wherein a detection platform and a fixing mechanism are arranged above the testing box body, the fixing mechanism comprises two first locating rods, two second locating rods, a transmission assembly and a driving cylinder, the two first locating rods are arranged on the right side of the detection platform, the two second locating rods are arranged on the left side of the detection platform, the second locating rods are connected with the driving cylinder through the transmission assembly, the driving cylinder drives the second locating rods to swing between a first position and a second position through the transmission assembly, the first position is the position of the second locating rods when a battery is fixed between the first locating rods and the second locating rods, and the second position is the position of the second locating rods when the battery is loosened. The problem of current when testing cylindrical lithium ion battery, the battery rolls easily, influences the test result to and traditional test mode test efficiency is lower is solved.

Description

Lithium ion battery safety performance testing device

Technical Field

The utility model relates to the technical field related to lithium ion batteries, in particular to a safety performance testing device for a lithium ion battery.

Background

Lithium ion batteries are rechargeable batteries that operate primarily by virtue of lithium ions moving between a positive electrode and a negative electrode. The lithium ion battery has the advantages of high energy density, long cycle life, no memory effect, low self-discharge rate and the like, and is the most advanced commercial secondary battery at present; the lithium ion battery has been developed into button type, cylindrical type, square type and aluminum plastic soft package battery; the cylindrical lithium ion battery is one of common lithium ion batteries, and has mature preparation process and high single battery capacity.

The lithium ion battery needs to be tested for safety performance before leaving the factory, and during the test, the battery needs to be fixed in order to ensure the accuracy and safety of the test, for example, related testing devices are disclosed in the patent with the publication number of CN114167297A, CN211206732U, CN202220397943, however, the battery fixing structure in the testing device in the patent is more suitable for square batteries. The current in carrying out the test to cylindrical lithium ion battery lacks suitable fixed knot and constructs, leads to the battery to roll easily at the in-process of test, influences the test result to and traditional test mode mainly relies on crocodile clamp (like CN 211206732U) to form temporary connecting circuit and tests, needs manual operation to clip the battery both ends, and test efficiency is lower, stability, reliability are poor.

There is a need for a lithium ion battery safety performance testing apparatus that ameliorates the above-described problems.

Disclosure of Invention

The utility model aims to provide a lithium ion battery safety performance testing device for solving the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the lithium ion battery safety performance testing device comprises a testing box body, wherein a detection platform and a fixing mechanism are arranged above the testing box body, the fixing mechanism comprises a first positioning rod, a second positioning rod, a transmission assembly and a driving cylinder, the number of the first positioning rod and the second positioning rod is two, the two first positioning rods are arranged on the testing box body on the right side of the detection platform, and the first positioning rods are fixedly connected with the testing box body; the two second positioning rods are arranged on the left side of the detection platform, the second positioning rods are connected with a driving cylinder in the test box body through a transmission assembly, and the driving cylinder drives the second positioning rods to swing between a first position and a second position through the transmission assembly, so that the clamping and fixing of the battery are realized; the first position is the position of the second positioning rod when the battery is fixed between the first positioning rod and the second positioning rod, and the second position is the position of the second positioning rod when the battery is loosened.

Further, the transmission assembly comprises a first connecting block and two groups of connecting rod assemblies, wherein the first connecting block is fixedly connected to a piston rod of the driving cylinder and can synchronously move along with the piston rod of the driving cylinder; the two groups of connecting rod assemblies are symmetrically arranged on two sides of the first connecting block and are respectively connected with the two second positioning rods for driving the second positioning rods to move;

each group of connecting rod assembly comprises a second connecting block, a first transmission rod, a second transmission rod, a rotating shaft and a third transmission rod, one end of the second connecting block is fixed on the first connecting block, the other end transversely extends outwards, a groove and a shaft hole are formed in the end portion, the groove and the shaft arranged in the shaft hole are used for hinging one end of the first transmission rod, the other end of the first transmission rod is connected with one end of the second transmission rod in a shaft mode through the rotating shaft, the first transmission rod and the second transmission rod can relatively rotate around the rotating shaft, the other end of the second transmission rod is fixedly connected with the lower end of the rotating shaft, a fixed shaft sleeve is sleeved outside the rotating shaft and can rotate in the fixed shaft sleeve, the outer side of the fixed shaft sleeve is fixedly connected with the test box, the upper end of the rotating shaft extends out of the test box, the end portion of the rotating shaft is fixedly connected with one end of the third transmission rod, the other end of the third transmission rod transversely extends outwards on the test box, and the end of the third transmission rod is connected with the second positioning rod.

The driving cylinder, the first connecting block, the second connecting block, the first transmission rod, the second transmission rod, the limiting slide block and the fixed support plate are located in the testing box body, the rotating shaft and the fixed shaft sleeve are connected to the top plate of the testing box body, and the third transmission rod is located above the outer portion of the testing box body.

Further, still include stop gear, stop gear includes spacing slider and fixed bolster, fixed bolster fixed connection is at the inboard top of test box, the spacing spout has been seted up on the lower surface of fixed bolster, the extending direction of spacing spout is parallel with the piston rod direction of motion of actuating cylinder, spacing slider upper end sliding connection is in the inside of spacing spout, the lower extreme of spacing slider is fixed on first linkage piece.

When the driving cylinder drives the first connecting block to move, the movement track and the travel of the limiting sliding block on the first connecting block are limited through the limiting sliding groove, so that the stability of the transmission assembly is further improved.

Specifically, testing platform includes loading board, electrode slice and supporting spring, the surface of loading board is equipped with the electrode slice, supporting spring sets up in the bottom of loading board, supports between test box and loading board.

Further, in order to facilitate the installation of the detection platform, a platform installation groove is formed in the top of the test box body, and the supporting springs are arranged in the platform installation groove.

Further, in order to realize automatic linkage, still include inductive switch, inductive switch sets up on the lateral wall of platform mounting groove, and inductive switch's height can detect the position of loading board. After the inductive switch detects that the bearing plate is pressed down, the battery is put on the detection platform, at the moment, a signal can be provided for the driving cylinder, so that the driving cylinder acts to drive the second positioning rod to act, the battery is clamped and fixed, and linkage is achieved. It should be noted that, the computer program related to receiving the inductive switch signal and providing the signal for driving the cylinder to operate can be implemented in the prior art, and no improvement is related to the program.

Further, in order to ensure that the positive electrode and the negative electrode of the battery are reliably connected with the power supply, the testing instrument and other circuits, the device further comprises a lifting electrode, wherein at least part of the lifting electrode is positioned above the detection platform and can be pressed on the positive electrode of the battery placed on the detection platform.

The lifting electrode can be realized in various modes, and can be directly arranged on the top of the first positioning rod or the second positioning rod, the first positioning rod or the second positioning rod is used as a supporting structure, then the lifting electrode directly extends to the upper part of the detection platform through a rod piece or a plate piece, and an electrode piece is arranged at the end part of the rod piece or the plate piece; the supporting structure of the lifting electrode can be independently arranged on the test box body, and then the lifting electrode extends to the upper part of the detection platform through a rod piece or a plate; the rod piece or the plate piece and the supporting structure can be lifted and pressed by the movable connection.

The electrode plate and the lifting electrode on the detection platform are connected with a power supply for testing or a testing instrument through lines so as to realize safety performance testing such as charging and discharging, needling and the like.

Further, the test box also comprises at least three support rods, wherein the support rods are arranged at the bottom of the test box body.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the two groups of first positioning rods are arranged on the right side of the detection platform, the fixing mechanism is arranged in the test box body and mainly comprises the air cylinder, the rotating shaft and the second positioning rods, the second positioning rods are pushed to be close to the inner side by the air cylinder, and the battery is fixed by the first positioning rods, so that the stability of the battery is improved, the battery is conveniently tested, the beneficial effects of effectively improving the testing precision of the battery are achieved, and the problem that the battery is easy to roll in the testing process and the testing result is influenced due to the lack of the fixing device in the conventional testing of the cylindrical lithium ion battery is solved.

2. According to the utility model, the detection platform is fixedly connected above the test box body, the electrode plates are fixedly connected to the surface of the detection platform, the negative electrode of the battery is fixed on the electrode plates through the two groups of fixing rods, the tester presses the other group of electrode plates on the positive electrode to form a circuit for performance test, so that the beneficial effects of improving the test speed and increasing the detection efficiency are achieved, and the problems that the conventional test mode mainly relies on crocodile clips to form a temporary connection circuit for test, the two ends of the battery need to be clamped by manual operation, and the test efficiency is low are solved.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the safety performance testing device for lithium ion batteries.

Fig. 2 is a schematic structural diagram of a fixing mechanism of the safety performance testing device for lithium ion batteries.

Fig. 3 is a schematic structural diagram of a second positioning rod of the safety performance testing device for lithium ion batteries.

Fig. 4 is a schematic structural diagram of a test box of the lithium ion battery safety performance test device.

Fig. 5 is a schematic structural diagram of a detection platform of the lithium ion battery safety performance testing device.

Fig. 6 is a schematic view of the use state of the safety performance testing device for lithium ion batteries.

In the figure: 1. a test box; 11. a first positioning rod; 12. a detection platform; 12.1, a bearing plate; 12.2, electrode plates; 12.3, supporting springs; 13. fixing the shaft sleeve; 14. a support rod; 2. a driving cylinder; 21. a first connection block; 22. a limit sliding block; 23. a second connection block; 24. a first transmission rod; 25. a second transmission rod; 26. a rotating shaft; 27. a third transmission rod; 28. a second positioning rod; 29. a fixed support plate; 3. a battery; 4. an inductive switch.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Several embodiments of the utility model are presented in the figures. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-6, the present utility model provides a technical solution: the utility model provides a lithium ion battery 3 security performance testing arrangement, includes test box 1, and test box 1 wholly is the cuboid structure, and inside cavity is equipped with four bracing pieces 14 in the bottom of test box 1, supports respectively on four angular positions. The top of test box 1 is equipped with testing platform 12 and fixed establishment, fixed establishment includes first locating lever 11, second locating lever 28, drive assembly and actuating cylinder 2, and wherein, first locating lever 11, second locating lever 28 are located the outside of test box 1, and partial drive assembly and actuating cylinder 2 are located the inside of test box 1. The number of the first positioning rods 11 and the number of the second positioning rods 28 are two, the two first positioning rods 11 are arranged on the test box body 1 on the right side of the detection platform 12, and the first positioning rods 11 are fixedly connected with the test box body 1; the two second positioning rods 28 are arranged on the left side of the detection platform 12, the second positioning rods 28 are connected with a driving cylinder 2 in the test box body 1 through a transmission assembly, and the driving cylinder 2 drives the second positioning rods 28 to swing between a first position and a second position through the transmission assembly, so that the clamping and fixing of the battery 3 are realized; the first position is the position of the second positioning rod 28 when the battery 3 is fixed between the first positioning rod 11 and the second positioning rod 28, and the second position is the position of the second positioning rod 28 when the battery 3 is released.

As shown in fig. 2 and 3, the transmission assembly comprises a first connecting block 21 and two groups of connecting rod assemblies, wherein the first connecting block 21 is fixedly connected to a piston rod of the driving cylinder 2 and can synchronously move along with the piston rod of the driving cylinder 2; the two groups of connecting rod assemblies are symmetrically arranged at two sides of the first connecting block 21 and are respectively connected with the two second positioning rods 28 for driving the second positioning rods 28 to move; each group of connecting rod assembly comprises a second connecting block 23, a first transmission rod 24, a second transmission rod 25, a rotating shaft 26 and a third transmission rod 27, one end of the second connecting block 23 is fixed on the first connecting block 21, the other end of the second connecting block transversely extends outwards, a groove and a shaft hole are formed in the end portion of the second connecting block, the second connecting block is hinged to one end of the first transmission rod 24 through the groove and a shaft arranged in the shaft hole, the other end of the first transmission rod 24 is in shaft connection with one end of the second transmission rod 25 through the rotating shaft, the first transmission rod 24 and the second transmission rod 25 can relatively rotate around the rotating shaft, the other end of the second transmission rod 25 is fixedly connected with the lower end of the rotating shaft 26, a fixed shaft sleeve 13 is sleeved on the outer side of the rotating shaft 26, the rotating shaft 26 can rotate in the fixed shaft sleeve 13, the outer side of the fixed shaft sleeve 13 is fixedly connected to the test box 1, the upper end of the rotating shaft 26 extends out of the test box 1, the end of the third transmission rod 27 is fixedly connected with one end of the third transmission rod 27, the other end of the third transmission rod 27 transversely extends outwards in the upper direction of the test box 1, and the end of the second positioning rod 28 is connected with the second positioning rod 28. The driving cylinder 2, the first connecting block 21, the second connecting block 23, the first transmission rod 24, the second transmission rod 25, the limit sliding block 22 and the fixed supporting plate 29 are located inside the test box 1, the rotating shaft 26 and the fixed shaft sleeve 13 are connected to the top plate of the test box 1, and the third transmission rod 27 is located above the outside of the test box 1.

As shown in fig. 2, the device further comprises a limiting mechanism, the limiting mechanism comprises a limiting slide block 22 and a fixed supporting plate 29, the fixed supporting plate 29 is fixedly connected to the top of the inner side of the test box body 1, a limiting slide groove is formed in the lower surface of the fixed supporting plate 29, the extending direction of the limiting slide groove is parallel to the moving direction of a piston rod of the driving cylinder 2, the upper end of the limiting slide block 22 is slidably connected to the inside of the limiting slide groove, and the lower end of the limiting slide block 22 is fixed to the first connecting block 21. When the driving cylinder 2 drives the first connecting block 21 to move, the movement track and the travel of the limiting sliding block 22 on the first connecting block 21 are limited through the limiting sliding groove, so that the stability of the transmission assembly is further improved.

As shown in fig. 4 and fig. 5, the detection platform 12 is a lifting structure, and is triggered and linked in a lifting manner, specifically, the detection platform 12 includes a carrier plate 12.1, electrode plates 12.2 and supporting springs 12.3, the surface of the carrier plate 12.1 is provided with the electrode plates 12.2, and the supporting springs 12.3 are disposed at the bottom of the carrier plate 12.1 and are supported between the test box 1 and the carrier plate 12.1. In order to facilitate the installation of the detection platform 12, a platform installation groove is formed in the top of the test box 1, and the supporting spring 12.3 is arranged in the platform installation groove. It should be noted that, a sensor is disposed below the detection platform 12 as the inductive switch 4, the inductive switch 4 is disposed on a side wall of the platform mounting groove, and the height of the inductive switch 4 can detect the position of the carrier plate 12.1. The battery 3 is automatically sensed after being placed thereon and the driving cylinder 2 is controlled to be activated by the control unit.

In order to ensure reliable connection of the positive and negative electrodes of the battery 3 with the power supply, the testing instrument and the like, the device further comprises a lifting electrode (not shown in the figure), wherein at least part of the lifting electrode is positioned above the detection platform 12 and can be pressed on the positive electrode of the battery 3 placed on the detection platform 12. In the embodiment, a down-pressing lifting electrode is adopted, and a hinge structure capable of rotating up and down is adopted between the supporting structure and the lifting electrode.

Working principle:

in the initial state, as shown in fig. 1, the detection platform 12 is lifted up above the surface of the test case 1 under the action of the supporting springs 12.3, and the second positioning rod 28 is in a second position away from the detection platform 12.

When detection is required, the battery 3 is placed above the detection platform 12, as shown in fig. 6, under the action of gravity of the battery 3, the supporting spring 12.3 is compressed, the bearing plate 12.1 is pressed into the platform mounting groove of the test box 1, and the upper surface is level with the surface of the test box 1; when the height of the bearing plate 12.1 pressed down reaches the position of the induction switch 4, the induction switch 4 triggers and sends out a signal indicating that the battery 3 is placed above the detection platform 12, at the moment, the control unit controls the driving cylinder 2 to act, a piston rod in the driving cylinder 2 pushes the first connecting block 21 to slide to the right side and pulls the first transmission rod 24 to move to the right, at the moment, the first transmission rod 24 drives the second transmission rod 25 to rotate around the rotating shaft 26, and the third transmission rod 27 drives the second positioning rod 28 to approach inwards and move to the first position, so that the battery 3 is fixed on the surface of the detection platform 12 together with the first positioning rod 11; then the tester will install the movable end of the lifting electrode of another group electrode slice 12.2 and push down to the positive top of battery 3, compress tightly battery 3 downwards, battery 3 positive negative pole is through supporting spring 12.3 and lifting electrode combined action, press from both sides tightly between the electrode of being connected with external power source, form the test loop and carry out the performance test, improve test speed, for crocodile clamp's connected mode, the electric performance is more reliable, improves battery 3's stability, is convenient for test battery 3.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a lithium ion battery security performance testing arrangement which characterized in that: including test box (1), the top of test box (1) is equipped with testing platform (12) and fixed establishment, fixed establishment includes first locating lever (11), second locating lever (28), drive assembly and actuating cylinder (2), first locating lever (11) and second locating lever (28) are two, two first locating levers (11) set up on testing box (1) on testing platform (12) right side, two second locating levers (28) set up the left side at testing platform (12), and second locating lever (28) are connected through drive assembly and actuating cylinder (2) inside testing box (1), actuating cylinder (2) drive second locating lever (28) swing between first position and second position through drive assembly, wherein, first position is the position of second locating lever (28) when battery (3) are fixed between first locating lever (11) and second locating lever (28), and second position is the position of battery (3) by second locating lever (28) when loosening.

2. The lithium ion battery safety performance testing device according to claim 1, wherein: the transmission assembly comprises a first connecting block (21) and two groups of connecting rod assemblies, wherein the first connecting block (21) is fixedly connected to a piston rod of the driving cylinder (2) and can synchronously move along with the piston rod of the driving cylinder (2); the two groups of connecting rod assemblies are symmetrically arranged at two sides of the first connecting block (21) and are respectively connected with the two second positioning rods (28);

each group of connecting rod assembly comprises a second connecting block (23), a first transmission rod (24), a second transmission rod (25), a rotating shaft (26) and a third transmission rod (27), one end of the second connecting block (23) is fixed on the first connecting block (21), the other end transversely extends outwards and is hinged with one end of the first transmission rod (24), the other end of the first transmission rod (24) is connected with one end of the second transmission rod (25) in a shaft mode, the other end of the second transmission rod (25) is fixedly connected with the lower end of the rotating shaft (26), a fixed shaft sleeve (13) is sleeved on the outer side of the rotating shaft (26), the rotating shaft (26) can rotate in the fixed shaft sleeve (13), the outer side of the fixed shaft sleeve (13) is fixedly connected to the test box (1), the upper end of the rotating shaft (26) extends out of the test box (1), the end of the rotating shaft is fixedly connected with one end of the third transmission rod (27), and the other end of the third transmission rod (27) transversely extends outwards in the upper direction of the test box (1), and the end of the rotating shaft (26) is connected with the second positioning rod (28).

3. The lithium ion battery safety performance testing device according to claim 2, wherein: still include stop gear, stop gear includes spacing slider (22) and fixed bolster (29), fixed bolster (29) fixed connection is at the inboard top of test box (1), spacing spout has been seted up on the lower surface of fixed bolster (29), the extending direction of spacing spout is parallel with the piston rod direction of motion of actuating cylinder (2), the inside at spacing spout of slider (22) upper end sliding connection, the lower extreme of spacing slider (22) is fixed on first connecting block (21).

4. The lithium ion battery safety performance testing device according to claim 1, wherein: the detection platform (12) comprises a bearing plate (12.1), electrode plates (12.2) and supporting springs (12.3), wherein the electrode plates (12.2) are arranged on the surface of the bearing plate (12.1), and the supporting springs (12.3) are arranged at the bottom of the bearing plate (12.1) and are supported between the test box body (1) and the bearing plate (12.1).

5. The lithium ion battery safety performance testing device according to claim 4, wherein: the top of the test box body (1) is provided with a platform mounting groove, and the supporting spring (12.3) is arranged in the platform mounting groove.

6. The lithium ion battery safety performance testing device according to claim 5, wherein: still include inductive switch (4), inductive switch (4) set up on the lateral wall of platform mounting groove, and the position of loading board (12.1) can be detected to the height of inductive switch (4).

7. The lithium ion battery safety performance testing apparatus according to any one of claims 1 to 6, wherein: the device also comprises a lifting electrode, wherein at least part of the lifting electrode is positioned above the detection platform (12) and can be pressed on the anode of the battery placed on the detection platform (12).

8. The lithium ion battery safety performance testing device according to claim 1, wherein: the test box also comprises at least three supporting rods (14), wherein the supporting rods (14) are arranged at the bottom of the test box body (1).